Permanent magnet, method of its production, rotor and motor with internal permanent magnet (ipm)

FIELD: engines and pumps.

SUBSTANCE: permanent magnet production process comprises the steps that follow. a) Fabrication of permanent magnet (1). b) Cracking of permanent magnet (1) to get two or more separate parts (13). c) Recovery of permanent magnet (1) by jointing rupture surfaces of separate adjacent parts (13) together.

EFFECT: perfected design.

21 cl, 16 dwg

 

Prior art

1. The scope of the invention

[0001] the Invention relates to a method of manufacturing a permanent magnet, which is placed in the groove of the rotor for a permanent magnet embedded motor, the permanent magnet manufactured in accordance with this method, the rotor equipped with a permanent magnet, and a motor with an internal permanent magnet (IPM), with this rotor.

2. Description of the prior art

[0002] Among various types of known engines, including engines with direct current (DC) without brushes, there is a motor with a built-in rotor with a permanent magnet, wherein a set of permanent magnets have inside of rotor core (this type of engine is known as a motor with an internal permanent magnet (interior permanent magnet, IPM)and below will simply be called "engine IPM"). The IPM motors are used, for example, as the engines in hybrid vehicles.

[0003] In the motor coil is formed by winding wound either concentrated or distributed way around teeth of a stator. The magnetic flux then is generated by applying DC current to the coil, and the magnetic moment and the reactive torque generated between the magnetic flux and the magnetic flux from the permanent magnet. The coil having the soap is divided winding, has a larger number of magnetic poles than the coil with a concentrated winding (Unallocated winding) so that the magnetic flux that penetrates the permanent magnet of the rotor from the side of the teeth (or the change in magnetic flux) is relatively continuous, when the rotor rotates. Therefore, the change in density of the magnetic flux when the rotor rotates relatively small. On the other hand, the coil with concentrated winding, the change in density of the magnetic flux is relatively large so that an eddy current is generated, as a rule, in the permanent magnet, causing the generation of heat by the permanent magnet. This can lead to irreversible thermal demagnetization, resulting in reduced magnetic properties of the permanent magnet.

[0004] From the viewpoint of drive motors used in modern hybrid vehicles and electric vehicles, attempts are being made, for example, to increase the speed or number of poles to meet the demand for better output performance (power) of the engine. However, the increase in rotation speed, etc. increases the change in the magnetic field which acts on the magnet, as a result, as a rule, the generated eddy current. Thermal demagnetization of the magnet caused by the generated heat, on the contrary Nigam engine performance and durability of the engine.

[0005] In the publication of the patent application of Japan No. 2005-198365 (JP-A-2005-198365), publication of the patent application of Japan No. 2004-96868 (JP-A-2004-96868), and the publication of the patent application of Japan No. 2006-238565 (JP-A-2006-238565), for example, attempts to prevent the generation of eddy current, and, thus, to prevent thermal demagnetization, which he calls, by forming the permanent magnet from many individual parts, which are then put together in the slots of the rotor.

[0006] the Manufacture of the permanent magnet from many individual parts, as described, for example, in JP-A-2005-198365, JP-A-2004-96868, and JP-A-2006-238565, is an effective way to suppress the generation of eddy current, which can be generated in the permanent magnet. Separate parts which together form the permanent magnet described in JP-A-2005-198365, JP-A-2004-96868, and JP-A-2006-238565, are formed in one of two ways, such as, (i) each of the individual parts are made separately, or (ii) a permanent magnet is formed to the size and shape of the inside groove of the rotor in which a permanent magnet is placed, is machined (i.e., cut) into many separate parts. The latter procedure is commonly used with regard to the efficiency of production and cost of production.

[0007] the process described above requires expensive cutting tool, for example, of which the first has diamond particles, glued to the outer peripheral side of the cemented carbide (tungsten carbide as a main component) of the disk. In addition, this cutting tool will wear out, and should therefore be replaced periodically, the frequency of which increases with the number of cuts (i.e., as the number of separate parts, on which is cut a permanent magnet, increases). As a result of these and other factors, maintenance increasing the manufacturing cost of such processing are the main problems.

[0008] There are also other problems with the processing of the permanent magnet by cutting. For example, a ferrite magnet or a rare-earth magnet such as neodymium (neodymium) magnet is a permanent magnet, has a metal structure formed of the main phases S, which contribute to the magnetic properties and phase R grain boundary, which contributes to the coercive force, as shown in Fig.9, which is an enlarged view of the structure of the magnet. When the permanent magnet is divided by processing, portions are formed along the section line indicated by the line L1 in the drawing. As is evident from the drawing, the line L1 is formed by cutting, i.e. separation, the major phases of S so that cut the main phases of S are smaller than before cutting. In the cut is ltate, the residual magnetic flux density (Br) becomes smaller after cutting.

[0009] in Addition, the phase R grain boundary expresses the coercive force relative to the main phases S, which it surrounds. However, due to the fact that the coating phase R grain boundary that surrounds the main phases of S which are in contact with the surface of the cut, broken, thus opening the main phases S, alternating magnetization, as a rule, easily occurs in an external magnetic field. Alternating magnetization leads to a decrease of the coercive force of the entire magnet.

The invention

[0010] This invention thus provides a method of manufacturing a permanent magnet, which is extremely simple and inexpensive, and does not reduce the size of the main phase, and does not destroy the coating surrounding the grain boundary phase. The invention also provides a permanent magnet manufactured in accordance with this method, the rotor is supplied by that permanent magnet, and the IPM motor supplied with this rotor.

[0011] the First aspect of the invention relates to a method of manufacturing a permanent magnet, which is placed in the slots of the rotor of the IPM motor. This manufacturing method includes a first step of manufacturing a permanent magnet, in General, of the same shape and size as the shape and size of the inner part of the groove by forming the magnetic h is stitz for permanent magnet in shaped stamp, a second step of forming two or more separate parts breakage of the permanent magnet, and a third recovery phase permanent magnet by combining the fracture surfaces of adjacent individual parts together.

[0012] This method of manufacturing a permanent magnet may be a method of manufacturing a permanent magnet, which is placed inside the groove of the rotor, formed in the rotor of the IPM motor. More specifically, this manufacturing method may be a method of manufacturing a permanent magnet, which is divided into many parts.

[0013] First, a forming die that includes a punch and die and the like, having previously assigned the cavity, ready, magnetic particles for a permanent magnet placed in this forming die, and punching is performed in the atmosphere of normal temperature (stage 1).

[0014] Further, the body formed by the pressure generated with a predefined shape and size, is sintered, and the resulting sintered body is divided into a predefined number of parts. Here in this method of manufacturing, on the assigned part of the sintered body (permanent magnet) is pressed so that the sintered body breaks instead of machine cutting by the cutting tool, as in the prior art (step 2).

[0015] As described above, when the permanent MAG is it which has a metal structure of the main phase and the grain boundary phase, disintegrating on the assigned part, he cracks along the grain boundary phase, which is relatively weak (for example, the so-called grain boundary fracture). Using this method of breaking, it becomes possible to prevent the residual magnetic flux density from decreasing, to protect the coercive force from decreasing due to magnetization reversal, as well as to eliminate associated with the replacement of the cutting tool maintenance and reduce the cost of manufacture.

[0016] After the permanent magnet, which should be placed in the groove of the rotor was broken on the assigned number of parts, it is then reduced by the combination of the fracture surfaces of the individual parts together (step 3).

[0017] Also, in order to preserve some of the fault within assigned area and make cracking more effectively, can be provided with a groove in the assigned position on the surface formed of a permanent magnet.

[0018] Further, when the groove is formed on the surface of the permanent magnet, the permanent magnet may be broken after the groove has been made.

[0019] Also, in step 1, the permanent magnet may be formed via phone, punched in the ri low pressure, which are stamped and sequentially stacked by performing punching in shaped stamp sequentially on multiple stages. In addition, at least the body, stamped at low pressure, which are adjacent to each other, can be stamped from magnetic particles of different material.

[0020] This method of manufacture produces one permanent magnet by placing a variety of bodies, stamped at low pressure, while they consistently are stamped, and leads to the provision of cracking on the edge surfaces having magnetic particles, at least one of these bodies, stamped at low pressure, which are adjacent to each other, different, made of different material.

[0021] the Body, stamped at low pressure, are formed by injection box magnetic powder in an amount corresponding to the number of stamping operations performed in shaped stamp, and pressure forming. This magnetic powder used to form the specified body, stamped at low pressure, from a different material than the magnetic powder used to form the previous body, stamped at low pressure. Two bodies, stamped with a low pressure, together form a formed body. This process is repeated for several is the space of a few operations punching to obtain a formed body, with the size and shape of the permanent magnet. The body is taken out from the die and placed in a furnace for sintering, and then disintegrating.

[0022] When the permanent magnet is sintered, residual stress occurs at the boundary surface of the phone, punched in at low pressure, which are made of other material, due to the difference in the quantities that enter into the body, stamped at low pressure. As a result, the boundary surface is a weak point at the break. Also, the boundary surface is the surface of the formation so that the adhesive force between the boundary surfaces is weaker than the connecting force between the main phase and the grain boundary phases in the bodies formed by low pressure. As a result, these boundary surface, as a rule, easily broken.

[0023] Also, in stages 2 and 3 as described above, each of the separate parts may be joined by the resin or formed with each other by the resin by placing a permanent magnet in the container filled with the resin, and then the breaking of the permanent magnet in this container. Alternatively, steps 2 and 3, each of the separate parts may be joined by the resin or pressoffice each other resin by filling the container with resin, at the same time, when the permanent magnet cracks in the container.

[0024] After tagatac permanent magnet is broken and then restored by combining the separate parts together, the individual parts must be attached to or formed with each other before magnetization so that the magnet device is not disturbed by the power of the magnetization of individual parts. This, however, requires time, and problematic from the point of view of coupling together each part of the permanent magnet. In addition, if a part is lost, the permanent magnet cannot be recovered (i.e., formed), which reduces manufacturing.

[0025] the Filling of the container inside with a cavity of the same size and shape as the groove of the rotor, the assigned amount of resin, and the breaking of the permanent magnet in this container allows the resin to effectively penetrate between the parts of the permanent magnet at the same time, when a permanent magnet, for example, disintegrating.

[0026] Also, in step 2, the permanent magnet can be broken with the speed of breaking 5 m/s or less.

[0027] in Addition, in step 2, as described above, when the permanent magnet should break down into at least four separate parts and at least three grooves form a permanent magnet, use the device breaking, including many pointed elements which enter into corresponding grooves and pushing the elements that push the pointed elements other than a pointed element in the center, towards to the end portions of the permanent magnet, and the permanent magnet may be broken, while pushing the pushing elements corresponding tapered elements, when pointed elements are pushed into the grooves in the process of breaking.

[0028] As can be understood from the explanation above, the method of manufacturing a permanent magnet according to the invention is extremely simple and inexpensive method that allows a permanent magnet with excellent magnetic properties. In addition, the IPM motor with excellent output characteristic can be obtained by use of a permanent magnet manufactured in accordance with this method.

Brief description of drawings

[0029] the Above and further objectives, features and advantages of the invention will be apparent from the following description of embodiments with reference to the accompanying drawings, which are characteristic rooms to display specific items and where:

Figa and 1B are diagrams illustrating a method of manufacturing a permanent magnet according to the present invention, and Figa diagram showing magnetic particles, injected into the forming die, and Figv diagram showing a longitudinal stamping magnetic field;

Fig. 2A-2D are diagrams that follow Figa and 1B illustrate a method of manufacturing a permanent magnet in accordance with the present invention, shows, in order from Figa to Fig.2D, a permanent magnet, which was extracted from the shaped stamp, breaks in the device breakage;

Figure 3 is a view showing a line fault in the structure of the permanent magnet;

Figa and 4B is a diagram illustrating another exemplary variant of the method of breaking a permanent magnet Figa diagram showing a permanent magnet placed inside the device breaking, and

Figv diagram showing a permanent magnet in a broken state;

5 is a diagram illustrating a method of simultaneous breakage of the permanent magnet and the connection of separate parts;

6 is a diagram showing a permanent magnet, which was recovered, placed in a groove of the rotor;

Fig. with 7A-7C is a diagram related to the IPM motor provided undivided permanent magnet (comparative example 1), the IPM motor provided a permanent magnet machine with sharp (comparative example 2), and the IPM motor provided a permanent magnet, broken in accordance with the method of manufacture of the present invention,

Figa - chart that compares the measured results related to the residual density of the magnetic flux of each,

Figw - chart that compares the measured results related to the coercive force of each, and

Fig.7 - chart comparing the measured results related to eddy losses in the comparative example 2 and the exemplary embodiment;

Fig - chart showing the results of the tests, taking into account the relationship between the speed of the fault and the area of grain boundary fracture; and

Fig.9 is a view of the section line in the structure of the permanent magnet in the case of a cutting machine in accordance with the prior art.

Detailed description of embodiments

[0030] Exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Figa and 1B are diagrams illustrating a method of manufacturing a permanent magnet in accordance with the invention, Figa diagram showing magnetic particles, injected into the forming die, and Figv diagram showing a longitudinal stamping magnetic field. Fig. 2A-2D are diagrams that follow Figa and 1B illustrate a method of manufacturing a permanent magnet in accordance with the invention, showing, in order from Figa to Fig.2D, a permanent magnet, which was extracted from the shaped stamp, breaks in the device breaking. Figure 3 is a view showing a line fault in the structure of the permanent magnet. Figa and 4B is a diagram illustrating another exemplary variant of the method of breaking the constant m is gnite, Figa diagram showing a permanent magnet placed inside the device breaking, and Figv diagram showing a permanent magnet in a broken state. 5 is a diagram illustrating a method of simultaneous breakage of the permanent magnet and the connection of separate parts, and 6 is a diagram showing a permanent magnet, which was recovered, placed in a groove of the rotor.

[0031] Figa and 1B show a forming die for manufacturing a permanent magnet. This forming die, mainly comprised of the matrix 50, which has openings both above and below the upper punch 20 and the lower punch 30 which includes no gap in the matrix 50 through upper and lower openings, respectively, and move vertically inside the matrix 50, and the coil 40, which are formed around the upper and lower punches 20 and 30. In this case, the shaped stamp on the drawings is shaped stamp to the longitudinal forming a magnetic field in which the direction of the magnetic field generated by the coils, parallel to the direction of sliding of punches. The alternative, however, may be used forming die for a cross-section forming a magnetic field in which the coil forming the N pole and S pole are placed on the outer side of the stamp so that the magnetic field is generated orthogonal to the direction of pushing of the punch press.

[0032] alost With formed between each end surface of the upper and lower punches. In particular, the protrusions for forming grooves 31 for forming the assigned number of grooves in the designated places on one side surface of the permanent magnet, which is formed by punching the magnetic particles G are provided on the end surface of the lower punch 30. In this case, when grooves are formed on both surfaces of the permanent magnet, can be used the punch, in which similar protrusions for forming grooves, are provided at locations on the target surface of the upper punch 20, which correspond to the protrusions 31 on the end surface of the lower punch 30.

[0033] As shown in Figa, magnetic force G required for the formation of one permanent magnet is inserted into the cavity C. Then, as shown in Figv, longitudinal stamping magnetic field is accomplished by movement of the upper punch 20 down, while the magnetic field M generated in the direction parallel to the direction of stamping (i.e., Z direction in the drawing).

[0034] In this case, though not shown in the drawings, another way of forming other than the above-described method is, for example, multi-layered way of stamping. This method uses a forming die in which both end surfaces of the upper and lower punches no protrusions for forming grooves. To the number of injected magnetic particles are separated, for example, in three parts, and stamping is carried out sequentially. Using this method, magnetic particles are injected in the first and third injection of the same material, while the magnetic particles are injected in the second injection, of a different material. With each injection, stamping is carried out so that the body stamped at low pressure, are formed sequentially. The resulting many bodies, stamped with a low pressure formed by the first, second and third injection of magnetic particles, forms a separate build a permanent magnet.

[0035] When the permanent magnet is manufactured by stamping, as described above, is sintered in a furnace for sintering at the next stage, the residual stress caused by differential thermal expansion of adjacent bodies, stamped with a low pressure occurs on the boundary surface between adjacent bodies formed by low pressure. In addition, the stamped surface of the formed multi-layered stamping are these boundary surfaces, so the separation is easy on these boundary surfaces.

[0036] In this case, between bodies, formed by low pressure, may also be formed of resin, which has a lower mechanical strength than the body, stamped with a low pressure,such as a resin of polyethylene, polypropylene or polystyrene or the like

[0037] Figa shows a permanent magnet, extracted from the shaped stamp after longitudinal forming a magnetic field, shown in figure 1. The permanent magnet 1 shown in Figa has a groove 11 formed in three places. The permanent magnet 1 then breaks into three areas outlined appointed fault lines 12. In this case, as described above, similar grooves may also be formed on the upper surface of the permanent magnet 1 at locations corresponding to the grooves 11 on the bottom surface. In addition, four or more grooves may also be formed as assigned.

[0038] Also, the method of forming the grooves is not limited to the method in which grooves are formed simultaneously in the permanent magnet, which was extracted from the shaped stamp, by providing protrusions for forming grooves on the inner surface of the cavity shaped stamp, as described above. Alternatively, can also be used a method in which grooves are formed in these assigned areas by further processing, after the permanent magnet has been formed.

[0039] Here, the groove 11 is etched using hydrochloric acid or sulfuric acid or the like, before the breaking of the permanent magnet 1. Oxidation of the surface the minute grooves by etching opens the grain boundary, which forms the main phase, located on the surface, which contributes to the separation along the surface of the grain boundary between the main phase.

[0040] the Etching in this case is called oxidation, at least the surface of the grooves, using hydrochloric acid or sulfuric acid or the like to open the grain boundary, which forms the main phase, placed on the surface, which contributes to breaking along the grain boundary phase between the main phases. Alternatively, the etching makes the boundary of the particle surface in a high strength magnetic layer, so that the power phase between grain boundaries is relatively small, which contributes to breaking along the grain boundary phase.

[0041] Further, the permanent magnet 1 is located between the lower punch 70 and the upper punch 60, which form the device 100 of cracking, as shown in Figv. Here, a convex polygonal surface, in which the lines 61, 62, and 63 of the fault are formed at locations corresponding to the respective fault lines, is formed on the end surface of the upper punch 60. Similarly, concave polygonal surface, in which the lines 71, 72, and 73 of the fault are formed at locations corresponding to the respective fault lines and are installed with a convex polygon is again the upper punch 60, is formed on the end surface of the lower punch 70.

[0042] As shown in Figs, when the upper punch 60 moves down the center of the permanent magnet breaks first, as shown in the diagram. Then, when the upper punch 60 moves further down, the side parts are also broken, as shown in Fig.2D, so that we have four separate sections 13.

[0043] When the permanent magnet disintegrating thus, the boundary fault L2 is created, as shown in Figure 3, which is an enlarged view of the internal structure of a permanent magnet. Here, the metallic structure of a permanent magnet formed by phase R grain boundary, which contributes to the coercive force that intervenes between the main phases S, which contribute to the magnetism. When this structure is mechanically cut, as is the case in prior art, the cut line L1 divides the main phases of S, as shown in Fig.9. On the contrary, in accordance with an exemplary embodiment, the fault line L2 is created along the phase R of the grain boundary, which is not as robust as the main phases of S. As a result, the individual parts can be obtained, while the original dimensions of the main phases S are supported and the outer periphery of the main phases of the S-protected phase R grain boundary.

[0044] Figa and 4B are diagrams illustrating other is my way of breaking the permanent magnet, using the breaking device in accordance with another exemplary embodiment. In this case, in the drawings, many of grooves 11 are formed in corresponding positions on both sides of the permanent magnet. The breaking device 100A is provided with the clamping surfaces 101 and 111 at the external side in the vertical direction. Breaks part 120 and 130 are mounted vertically to the inner side of the pushing surfaces 101 and 111. Breaks part 120 and 130 include a variety of pointed elements 105, 106, 107, 115, and 117 provided on the surface on the opposite side of the pushing surfaces 101 and 111 in locations corresponding to the grooves 11 in the permanent magnet. In addition, we peel the parts 120 and 130, the springs 104 and 114, and the moving elements 103 and 113, which are connected with these springs 104 and 114 are attached to the pointed elements 106, 107, 116, and 117, different from the pointed elements 105 and 115, which correspond to the grooves in the center, among the many grooves. These moving elements 103 and 113 have a triangular cross-section when viewed from the side, and pointed elements 106, 116, 107, 117, each attached to the end surface on the side facing to the permanent magnet among the three sides of the triangular sliding elements 103 and 113. Also, the end surface on the clamping article is Rone among the three sides of the triangular sliding elements 103 and 113 is inclined relative to the clamping surface. The tabs 102 and 112, which protrude from the clamping surfaces 101 and 111 abuts the inclined surface of the moving elements 103 and 113. When the clamping surfaces 101 and 111 are pushed, i.e. move down, the tabs 102 and 112 move the moving elements 103 and 113 in the direction of the end portions of the permanent magnet against the impelling force of the spring 104 and 114. As a result, sharp protruding elements 106 and 116 and the like, which are connected with the moving elements 103 and 113, respectively, are moved sideways moving elements 103 and 113, however, is also moved vertically (in the direction of breaking).

[0045] When the two pushing surfaces 101 and 111 are pushed in opposite directions (in the X direction on Figv), as shown in Figv, from the position shown in Figa moving elements 103 and 113 are pushed outward in the direction Y1 by means of the projections 102 and 112, pushing the moving elements in the direction X1. The corresponding upper and lower tapered elements 106 and 116 and the like break of the permanent magnet 1A, while the separated fragments on the target parts are pushed outward toward the side of the end portion of the permanent magnet, a moving relevant pointed elements. As a result, the permanent magnet 1A can be effectively broken in the Central hours of the I.

[0046] FIG.5 is a diagram showing the breaking device 100B, which includes a container 80 with a hole, and the cover 90, which is installed in the hole.

[0047] the Container 80 includes protrusions 81, 82, and 83 on the bottom surface, at positions corresponding to the grooves 11 formed in the permanent magnet 1. The internal shape and internal dimensions of the container 80 with the cover 90 is assigned, as a rule, the same as the inner shape and internal dimensions of the groove of the rotor in which the permanent magnet should be placed.

[0048] the Pitch P for coupling the assigned number of the individual parts together is injected into the container 80 before the permanent magnet 1 is placed in the container 80.

[0049] the Permanent magnet 1 is then placed in the container 80 and the cover 90 is adapted to the container 80 and is pushed down. As a result, the breaking device 100B permanent magnet 1 breaks into four separate parts, at the same time, the resin R penetrates between the individual parts. It then gets restored permanent magnet, as soon as the resin between the fragments hardens.

[0050] the Use of this device breaking 100V allows not only to break the permanent magnet and hook the pieces together almost simultaneously, but also prevents loss of parts and facilitates the work is in the grip of individual pieces together later.

[0051] In this case, in order to facilitate the penetration of the resin, the breaking device can also be fitted with a suction device for creating a reduced atmospheric pressure in the illustrated razlamyvayut device.

[0052] In this case, the resin may also be injected into the container simultaneously with the breaking. Also, the creation of low atmospheric pressure inside the container further increases the penetrating effect of resin.

[0053] the Resin described above may be epoxy resin or an IUD (the compound for bulk forming) resin or the like. Preferably, the resin was heat-resistant, for example, approximately 200°C. In this case, HSR resin is a molding resin, in which a strip of glass fiber as the reinforcing elements are mixed with the unsaturated polyester resin, which is a main component.

[0054] As shown in Fig.6, the permanent magnet 1, which was broken (the fault line indicated by the letter K) device breaking 100 or 100B and restored clutch parts back together, is placed in the groove 1100 1000 rotor, formed for example, of laminated magnetic steel sheets, the IPM motor, and is fixed in its position.

[0055] [Comparative tests and the test results relating to the residual density of the magnetic flux, the coercive with the Les and eddy losses]

The inventors have prepared for testing permanent magnet, the IPM motor in which a permanent magnet is one part (i.e., not broken) in the rotor (comparative example 1), and the IPM motor in which a permanent magnet was machine cut cutting tool and then rebuilt and fixed in the rotor (comparative example 2), and the IPM motor in which a permanent magnet was broken and then restored in accordance with the method of the fault approximate variant implementation and fixed in the rotor (rough version of the implementation), and tested each. Each part of the test has a cross-section 6.5 mm × 9.9 mm and a length of 57 mm, Also, a permanent magnet, which was cut in 14 locations so that was received 15 individual parts, and then restored. Similarly, a permanent magnet, which was broken, was broken in 14 places so that was received 15 individual parts, and then restored.

[0056] When using the parts for the tests described above were measured, the coercive force (Hcj) and the residual magnetic flux density (Br), which are the magnetic properties of comparative examples 1 and 2 and the approximate variant implementation, the test results are compared. In addition, in order to prove that a permanent magnet which was broken, equivalent from the point of view of the vortices is of evich losses to the permanent magnet, which was machine cut in accordance with the prior art, the vortex loss of comparative example 2 and the approximate variant of implementation were measured and the test results are compared.

[0057] the comparison Results are shown in Fig. with 7A through 7C. In this case, Figa and 7B, the measured value of comparative example 1 is 100, and the measured value of other parts of the test are specified as percentages relative to this value. Also, Figs, the measured value is an approximate version of the implementation is also equal to 100.

[0058] In accordance with Figa, it is obvious that the value of comparative example 2, in which a permanent magnet was cut, as well 97,6 and the approximate value of option exercise, in which the magnet was broken, as well 99,3, 1.7 higher than the value of comparative example 2. Increased the value of the residual density of the magnetic flux is extremely high from the point of view of the magnetic properties of the engine, due to the fact that the main phases, which form a permanent magnet, were not separated and reduced in size as described above.

[0059] Also, in accordance with Pigv, it is obvious that the value of comparative example 2 is 97,0 and the approximate value of option exercise equal to 99.5, which is 2.5 greater than the value of comparative example 2. Like the residual density of the magnetic flux, this vozrashchennaya for the coercive force is also extremely high in terms of the magnetic properties of the engine and also by reason of the fact that the alternating magnetization does not occur, because the floor of the grain boundary phase surrounding the main phase is not disturbed as the result of cracking, as described above.

[0060] Further, in accordance with Figs, it is clear that the vortex losses approximate variant implementation is approximately the same as for comparative example 2. It is therefore evident that even if a permanent magnet is broken, you can expect eddy losses equivalent to those when the permanent magnet machine cut.

[0061] [Test and test results related to the rate of cracking and the area of grain boundary cracking]

In addition, the inventors also prepared parts for trials in which only the groove formed in the center of the permanent magnet. This permanent magnet is then supported at two points on the left and right end parts, so as to cover two sides of the groove, and approximately the same load was applied at a constant speed pressure (speed breaking) to the left and right of the groove, after which it was measured the percentage of the sectional area of the surface of the grain boundary cracking. This test was conducted with different speeds breakage. The measurement results of the cross-sectional area of grain boundary at each speed breaking show what s on Fig.

[0062] In accordance with Fig, it is obvious that the rate of rupture of approximately 5 m/s is a point of inflection, the area of grain boundary cracking during this time, approximately 30% of the total area of cracking. Lower speed breaking leads to a sudden increase in the area of grain boundary cracking, when the speed of the breaking of approximately 1 m/s area of grain boundary cracking is approximately 70% of the total area of cracking, and when the speed of the breaking of approximately 0.1 m/s area of grain boundary cracking is approximately 80% of the total area of cracking. In accordance with these test results, it is preferable that the breaking was carried out with the speed of breaking 5 m/s or less, and more preferably 1 m/s or less.

[0063] Although exemplary embodiments of the invention have been described in detail with reference to the drawings, the specific structure is not limited to these exemplary embodiments of the implementation. That is, many modifications and changes, such as changes in design, are also included in the intended scope of the invention.

[0064] for Example, a permanent magnet, which is obtained by the method of manufacture in accordance with an exemplary embodiment of the invention, in particular not limited to the W while it includes rare earth magnet, ferrite magnet, or Alnico magnet and the like, and has a metal structure made of the main phases, which provide a contribution to the magnetism, and the grain boundary phase, which contributes to the coercive force. Also, the term "permanent magnet" in this invention can also apply to a sintered body or simply a compact body that has not yet been magnetized, as well as to rare earth magnet or the like that has been magnetized. Examples of rare earth magnets include a magnet of neodymium with a system of three components, in which iron and boron added to the neodymium magnet of samarium and cobalt, made of two-component system alloy of samarium and cobalt magnet of samarium, iron, and nitrogen, the magnet of prasetiya etc. Among specified, rare earth magnet has a product with a higher maximum energy (BH)maxthan a ferrite magnet or Alnico magnet, therefore, the rare earth magnet is more suitable for use in engines, hybrid vehicles, etc. where high output performance.

[0065] Further, in the method of manufacturing in accordance with an exemplary embodiment of the invention, can be prepared shaped stamp, which includes a punch and die and the like, having appointed the cavity, the magnetic particles for permanent magni is and injections in this forming die, and the stamping is carried out at normal atmospheric temperature (stage 1). In this case, the punching may be, for example, longitudinal stamping magnetic field or a transverse magnetic field. This stamping forms a permanent magnet having the same or similar shape and size, as, for example, inside the groove of the rotor. That is, in General, the same shape and size in this exemplary embodiment, include not only the same shape and size, but also of similar shape and size. However, in this exemplary embodiment of the invention, a permanent magnet, which was broken into separate parts, and these separate parts are then formed together (i.e., integrated) with molding resin or the like, is placed and fixed in the slot of the rotor so that the size of the permanent magnet is slightly smaller than the groove of the rotor.

[0066] In the method of cracking and subsequent recovery of the permanent magnet, preferably under condition of efficiency of production to carry out all the required number of faults at the same time. For example, when three or more grooves formed on one permanent magnet so that four or more separate parts are formed, the inventors have determined that a permanent magnet breaks easily end parts, but it is not easy - not far from the center. So when trying to build everything from the compulsory part immediately, all individual parts can theoretically be obtained, for example, by inserting a wedge-shaped elements in the grooves and push them down at the same time. In reality, however, the insertion of the pointed elements in the grooves in the end pieces creates a compression force to the two ends of the permanent magnet towards the center. As a result, the resistance elements of the permanent magnet compression forces to the left and to the right is greater than the force of insertion of a pointed element in the Central position, which makes more complex the breaking of the permanent magnet in the Central position.

[0067] Therefore, in this exemplary embodiment, it is breaking, which has many sharp items corresponding to the set of grooves provided on a part of the clamping surface and the clamping elements, such as springs are provided at the pointed elements other than a pointed element, which corresponds to the groove in the centre. Pushing pushing surface pushes down sharp items in appropriate grooves, breaking a permanent magnet. At the same time pushing the push elements obtained separate parts toward the end portions of the permanent magnet, which suppresses the force of compression occur towards the center of the permanent magnet, thus enabling R is slyvania part near the center. In this case, the pointed elements on the end portions of the permanent magnet can be made longer (i.e., higher)than the elements in the center, so that when the pushing surface is pushed down in one push, first break of the final part and received individual parts are popped out, then break the Central part.

[0068] In this case, the permanent magnet manufactured in accordance with the method of manufacturing an exemplary variant of the invention described above, the rotor provided by this permanent magnet, and an IPM motor provided with this rotor, particularly suitable for motor hybrid vehicles or electric vehicles, which require high output efficiency.

[0069] Although it was considered the present invention with reference to its exemplary embodiments of implementation, it should be understood that the invention is not limited to the exemplary embodiments of the implementation or designs. On the contrary, the invention is intended to cover various modifications and equivalent devices. In addition, while the various elements of exemplary embodiments are shown in various combinations and configurations, which are exemplary, other combinations and configurations, including more, less or t is like one element, also refer to the nature and scope of the present invention.

1. A method of manufacturing a permanent magnet (1), inserted into a groove of the rotor for a motor with an internal permanent magnet, characterized in that:
produce one permanent magnet is generally the same shape and size as the shape and size of the internal volume of the groove by forming magnetic particles for this permanent magnet in shaped stamp (50);
ask at least one fault line to separate this one permanent magnet on a specified number of individual pieces;
break the specified one permanent magnet along at least one predetermined fault line, receiving the specified number of at least two separate parts of one permanent magnet; and
restore this one permanent magnet, connecting these separate parts of the fault lines.

2. The method of manufacturing according to claim 1, in which obtaining a given number of individual parts includes a pressure on a given surface area of this one stamped permanent magnet.

3. The method of manufacturing according to claim 2, in which the specified one permanent magnet forming at least one groove (11) along a given(s) line(s) of the fault, with the specified(s) groove(s) is(are) set(s) site(s) for push./p>

4. The method of manufacturing according to claim 3, in which the specified one permanent magnet forming at least one groove (11) along a given(s) line(s) of the fault, when punched this one permanent magnet.

5. The method of manufacturing according to claim 3, in which the specified one permanent magnet forming at least one groove (11) along a given(s) line(s) of the fault before breaking this one permanent magnet.

6. The method of manufacturing according to any one of p-5, in which one permanent magnet break after etching grooves.

7. The method of manufacturing according to claim 1, in which one permanent magnet is formed with a given number stamped at low pressure and sequentially stacked bodies through the implementation of stamping consistently in several stages; and at least body, stamped at low pressure, which are adjacent to each other, are formed from magnetic particles of different material.

8. The method of manufacturing according to claim 7, in which the residual voltage between the specified number of bodies, stamped with a small pressure.

9. The method of manufacturing according to claim 7, in which the one stamped a permanent magnet is broken into a specified number of bodies, stamped with a small pressure.

10. The method of manufacturing according to any one of claims 1 to 5, in which the breaking of this one constantly what about the magnet carried out in the container (80), filled with resin; and the restoration of this one permanent magnet includes coupling a given number of separate parts together using resin.

11. The method of manufacturing according to any one of claims 1 to 5, in which the breaking of this one permanent magnet carried out in the container (80), filled with resin; and the restoration of this one permanent magnet includes forming a given number of separate parts together using resin.

12. The method of manufacturing according to any one of claims 1 to 5, in which the breaking of this one permanent magnet is in the container (80); the resin injected into the container at the same time, when you break this one permanent magnet; and the restoration of this one permanent magnet includes coupling a given number of separate parts together with resin.

13. The method of manufacturing according to any one of claims 1 to 5, in which the breaking of a permanent magnet carried out in the container (80); the resin injected into the container at the same time break the permanent magnet; and the restoration of the permanent magnet includes forming a small number of individual parts together using resin.

14. The method of manufacturing according to any one of claims 1 to 5, in which the breaking of this one permanent magnet carried out with the speed of breaking 5 meters per second or less.

15. The method of manufacturing according to any one of the claim 1-5, in which, when this one stamped a permanent magnet is supposed to break at least four separate parts and at least three grooves (11) are formed on one permanent magnet, use the device breaking, including many pointed elements which enter into corresponding grooves and pushing the elements that push the pointed elements other than a pointed element in the center, towards the end of this one permanent magnet, and this one permanent magnet break when pushing the push elements corresponding tapered elements, and pointed elements are pushed into the grooves during breaking.

16. The method of manufacturing according to any one of claims 1 to 5, in which one permanent magnet is formed from several major phases and phase grain boundary, located between the main phases; and the breaking of this one permanent magnet carried out along the grain boundary phase.

17. The method of manufacturing according to any one of claims 1 to 5, in which one permanent magnet is a rare earth magnet.

18. The method of manufacturing according to any one of claims 1 to 5, in which a specified number of individual parts is four.

19. A permanent magnet manufactured by the method of manufacturing according to claim 1.

20. A rotor for a motor with internal constant is m magnet, in which a permanent magnet according to claim 19 is installed in the slot.

21. Engine internal permanent magnet, equipped with at least a rotor according to claim 20.



 

Same patents:

FIELD: electricity.

SUBSTANCE: method to manufacture a rotor (14) is proposed for an electric machine (13), including the following stages of its realisation: a) manufacturing of a magnetic element (8) by means of adhesion of permanent magnets (1, 1', 1", 1'") to each other with the help of the first glue, at the same time each permanent magnet (1, 1', 1", 1'") has one side (2) with the magnetic north (N) and one side (3) with the magnetic south (S), at the same time permanent magnets (1, 1', 1", 1'") when adhered are arranged so that sides of the magnetic north (N) or sides of the magnetic south (S) form a common lower side (3, 3', 3", 3'") of the magnetic element (8), at the same time the first glue in the hardened condition has the solid consistency; b) adhesion of the lower side of the magnetic element (8) with the yoke (12) with the help of the second glue, at the same time the second glue in the hardened condition is soft and elastic, which eliminates break of the second glue as the temperature of expansion of the magnetic element (8) and the yoke (12) increases. At the same time the yoke (12) in the place where the magnetic element (8) is adhered to the yoke (12), has the soft and elastic layer (2).

EFFECT: provision of rationality of rotor manufacturing process with permanent magnets with simultaneous provision of high reliability of permanent magnets fixation with closure on material of an electric machine rotor yoke.

3 cl, 7 dwg

FIELD: electricity.

SUBSTANCE: in the process of making an external rotor (17) of an engine, permanent magnets (7) are placed along the peripheral surface (4) of a cylindrical pattern (1); a cylindrical ring (8) is placed on the outer surface of the permanent magnets with pretensioning, wherein the opening (14) of the lower element (13) of the rotor is placed concentrically relative to the peripheral surface (3) of the pattern (1). The invention also relates to the design of a rotor made according to said method. The present method enables to assemble a rotor not in the direction from its outer side to its inner side, but from its inner side to its outer side.

EFFECT: providing high accuracy of positioning inner sections of permanent magnets relative the opening in the lower, ie inner, element of the rotor, or to the position of the engine shaft so as to obtain an air gap with very small clearance, using a pattern which can be made while observing high accuracy of its geometrical dimensions, considerably low cost of making the disclosed rotor.

11 cl, 8 dwg

Synchronous machine // 2486653

FIELD: electrical engineering.

SUBSTANCE: rotor consists of the main casing (20) and a range of support casings (30a, 30b), which are fixed on the main casing (20) and supporting permanent magnets (40). The two first support casings (30a) located at distance from each other form entrance area for the second support casing (30b) providing possibility of rigid mounting of the first support casing (30a) to the second support casing (30b).

EFFECT: simplified assembly.

36 cl, 6 dwg

FIELD: electrical engineering.

SUBSTANCE: method includes the following successive steps: a) a set (36) is formed by attaching of at least two unit elements to each other with insulation between them, at that unit elements are magnetised; b) mechanical treatment (68) of main surface for the set of unit elements in order to form cylindrical surface with radius equal essentially to the core radius. The magnetisable set (70) is magnetised; c) magnetised sets are set (72) at the core. At that the above magnetised set forms at least a part of the magnetic pole. Rotor contains the core; at least one magnetic pole is mounted at the core by means of the above method.

EFFECT: ability to resist mechanical impact of magnetic pole during rotor spinning.

10 cl, 8 dwg

FIELD: electrical engineering.

SUBSTANCE: invention may be used, e.g., during installation of a bushing installation around the shaft of an electric machine rotor with permanent magnets or in other devices where the bushing is to be rigidly fixed on the shaft part, simultaneously subject to effects of turning forces, in particular, at a high rotation rate. The proposed method of the bushing installation around the shaft (2) part by way of press fit includes the following steps: installation of a guide element (7, 23) with an external surface (8) that is at least partly conical; installation of the guide element (7, 23) as an extension of the above shaft (1) part (2); the bushing (5) relocation along the guide element (7, 23) onto the shaft (1) part (2); the press (13) relocating in an axial direction towards the conic part (9) during the first stage of the bushing (5) relocation along the guide element (7); usage of a press element (17) with an internal diameter (D10) equal to or in excess of the external diameter (D1) of the shaft (1) part (2) during another stage of the bushing (5) relocation along the guide element (7).

EFFECT: ensuring the possibility of a lengthy bushing press fit installation onto the shaft part at room temperature (the bushing made eg of a synthetic material) to form firm connection between the shaft and the bushing without the risk of the bushing bend or damage with simultaneous saving of time spent on such assembly.

21 cl, 17 dwg

FIELD: electricity.

SUBSTANCE: there proposed is rotor (16) manufacturing system and method, as well as magnetisation method of cylindrical element of electric machine (10), in compliance with which multiple segments (28) of constant magnet are fixed around rotor spindle (24). Desired orientation directions (29) of constant magnet segments (28) are determined. Then, mounted constant magnet segments (28) are placed into magnetisation equipment (44) so that desired orientation directions (29) of constant magnet segments (28) are combined with the appropriate flow directions (74) of magnetisation equipment (44). At that, desired orientation directions of constant magnet segments have such configuration that directions of the next orientation are changed from the direction which is essentially normal to the direction of rotor rotation about D-axis of rotor pole, to the direction which is essentially tangent to rotor rotation direction about Q-axis of rotor pole; desired orientation directions of constant magnet segments are determined by means of magnetic analysis by using finite element method according to the main characteristic of which the desired orientation directions of constant magnet segments are such that almost coincide as to the direction with magnetic flow formed with the magnetisation equipment.

EFFECT: simplifying the design, improving the efficiency and shortening the magnetisation process of constant magnet segments in rotors of electric machines.

13 cl, 6 dwg

FIELD: electricity.

SUBSTANCE: invention relates to electrical engineering and referred to details of rotor manufacture on permanent magnets for electrical motor where permanent motors (4; 36) in inner side of rotor are arranged in parallel to rotor rotation axis (X) and in area of radial external longitudinal edges (8; 16) of permanent magnets (4; 36). Open outwards grooves are available on the external perimetre of rotor. They are tilted or bent to longitudinal edges (6; 18) of adjacent permanent magnets (4; 36) in the direction of perimetre or at least cross it once. The grooves (6; 18) on external side of rotor in the direction of perimetre are less wide than those close the centre of groove section (6; 18). The form of the groove cross section (6; 18) is constant along rotor length. Besides the invention is referred to such rotor manufacture method.

EFFECT: even change of rotor torque moment with maximum efficiency factor and improved effectiveness and simplified motor manufacture and assembly.

19 cl, 13 dwg

FIELD: electricity.

SUBSTANCE: plates are cut of sheets made of non-magnetic material of austenite-martensite grade, which is able to change in process of cold deformation from non-magnet phase to magnet phase, and when further heated - back to non-magnet phase. Such material may be alloy on the basis of austenite-martensite corrosion-resistant steel. At first stock non-magnet sheets are exposed to at least 65% cold pressing, shaping material change over to magnetic phase with magnetic permeability µ>100 Gs/E. Afterwards, with the help of heating by laser radiation up to 1000 - 1200°C, reverse conversion of material phase is carried out in local sections, corresponding to location of non-magnet zones of rotor plates with magnetic permeability µ=1 Gs/E. Previously prior to heating, absorbing coating is applied onto sections of surfaces that correspond to arrangement of non-magnet zones, and the coating increases thermal effect at least 2.5 times. For reliable preservation of material magnet phase resistance it is optimal that its temperature is at least 500°C below temperature of converted local sections heating. After heating and further natural cooling on air, coating is removed, rotor plates are cut as per program and are fixed to each other in axial direction into packet, which is installed on rotor shaft. Heating with laser radiation is carried out by means of sheet surface scanning by focused or non-focused laser beam. Gradient material has high mechanical characteristics (yield point on both phases is at least 80 kG/mm2) while magnetic permeability of magnetic material is at least 100 Gs/E, and non-magnetic - 1 Gs/E.

EFFECT: increased permissible peripheral speed of rotor rotation and increased utilisation ratio of electric machine.

5 cl, 2 dwg

FIELD: electricity.

SUBSTANCE: invention refers to the sphere of electrical engineering and electrical machinery industry and is of relevance for design and development of high-speed synchronous electrical machinery equipped with permanent magnets. Conceptually the invention consists in the process of the electrical machine rotor assembly envisaging an alternating pole magnetic system being mounted on the rotor shaft composed of tangentially magnetised permanent magnets (1) with the poles arranged between them. Under the method proposed the magnetic system consists of regularly alternating magnetic (2) and non-magnetic (3) O-plates with slots for insertion of permanent magnets (1). First the nonmagnetic plates (3) are fixed on the shaft being slipped on the axial pins (4) regularly alternating with the magnetic plates (3) whose outer diameter exceeds that of the magnetic plates. After that all the plates are tightly drawn together in the axial directions with the help of the remaining pins and the projecting edges of the magnetic pales (2) are turn-treated till the latter's outer diameter comes to equal that of the nonmagnetic plates (3); the treatment over, the permanent magnets are mounted.

EFFECT: facilitation of assembly and reduction of labour intensity.

3 cl, 2 dwg

FIELD: electrical engineering; rotors for motors, generators, various power installations such as power stations, welding units, mechanized tools, etc.

SUBSTANCE: proposed rotor designed for use in permanent-magnet machine incorporating flat permanent magnets and magnetic core stacks has nonmagnetic metal casing accommodating core stacks and poles made of magnetically soft metal sheet, as well as flat magnets disposed in nonmagnetic material parallelepiped-shaped holed open on one end so that at least magnets are fixed in these holes by means of easily curing material or by surface of part having temperature expansion compensating means joined to rotor; novelty is that stress concentrators of compensation means are uniformly offset on rotor ring circumference relative to fastening slots and semi-cylindrical depressions on circular surface, as well as relative to one another.

EFFECT: precluded shrinkage cracks in nonmagnetic material of rotor body at crystallization and deformation of its ring upon mechanical treatment.

4 cl, 6 dwg

FIELD: electricity.

SUBSTANCE: in a magnetoelectric engine rotor contains a disc fixed at a shaft whereat a ring-shaped line of permanent magnets with alternating polarity is mounted. A stator contains two parallel plates and the stator windings are placed between them. The stator plates are equipped with cores of electric steel, at which the stator windings are placed. The cores are made as two rings and there are protrusions at their surfaces faced to each other. Width of the protrusion B is equal to half of the permanent magnet C width. Protrusions of one core are off-centred in regard to protrusions of the other core to the half of the permanent magnet C width. The rotor disc is placed between the cores of the stator windings.

EFFECT: increasing power of the magnetoelectric engine with preservation of its dimensions.

4 dwg

FIELD: electricity.

SUBSTANCE: in a magnetoelectric generator a rotor contains a disc fixed at a shaft whereat a ring-shaped line of permanent magnets with alternating polarity is mounted. The magnets are regularly spaced in regard to each other. A stator contains two parallel plates and the stator windings are placed between them at cores of electric steel, which are fixed at the stator plates. The cores are made as two rings and there are protrusions at their surfaces faced to each other. Width of the protrusion B is equal to half of the permanent magnet C width. Protrusions of one core are off-centred in regard to protrusions of the other core to the half of the permanent magnet C width.

EFFECT: increasing power of the generator and reduction of the output voltage fluctuation due to provision of a minimum and permanent gap between the stator and rotor components.

4 dwg

FIELD: electricity.

SUBSTANCE: according to the invention the suggested inductor-type generator containing the front and rear covers, a stator with operating winding, an excitation source and a rotor with a shaft, is equipped additionally with a ferromagnetic ring, closing elements, a star-shaped magnet core with an opening and a non-ferrous insert; at that the ferromagnetic ring is inserted tightly with its first lateral side in the stator zone free of end-connectors, at the other side of the ferromagnetic ring there are installed closing elements connected to sprocket teeth and the sprocket itself is connected to the rear cover by the non-ferrous insert and the rotor with the shaft is placed in a central opening of the sprocket.

EFFECT: generating electromotive force at rotational speed from low values up to the rated values of the rotor shaft of the synchronous inductor-type generator in comparison with the demand to ensure the rotor rotation for operation of the asynchronous generator above the rated speed value.

4 dwg

FIELD: electricity.

SUBSTANCE: modular electromagnetic device has a stator and a rotor rotating between facing surfaces of the stator and bearing a plurality of magnets distributed with alternate orientations in a substantially annular pattern. The stator comprises at least one pair of magnetic yokes symmetrically located at both sides of the rotor. Each yoke has a pair of projecting arms extending towards the magnets and bearing a respective coil for receiving electric power from or supply of electric power to the electromagnetic device. Each yoke is individually mounted on its own support equipped with adjusting units arranged to adjust the yoke position relative to the oppositely lying magnets. The yoke forms, together with its coils, its support, its adjusting units and measuring and control means controlling the yoke adjustment, an elementary stator cell that can be replicated to form single-phase or multiphase modules.

EFFECT: enabling adjustment and optimisation relative to the stator and rotor position in order to obtain maximum efficiency and maximum operating flexibility of the system.

37 cl, 28 dwg

FIELD: electricity.

SUBSTANCE: modular electric machine comprises electromagnetic modules, which consist of two U-shaped cores arranged with their ends to each other so that ferromagnetic inserts on the rotor installed between two cores match in the projection with ends of each pair of two U-shaped cores. Electromagnetic modules are fixed along the circumference without radial displacement relative to each other, windings of the anchor are wound separately on each rod of the U-shaped core, which are arranged further from the machine shaft, and the excitation winding is made toroidal, common for all electromagnetic modules of each fixed part of the stator, as a result of which rods of U-shaped cores that are close to the machine shaft are arranged tightly to each other, which results in maximum reduction of distance between electromagnetic modules. At the same time anchor windings of one phase displaced by a pole division are connected as matching in series.

EFFECT: provision for reduced diameter of a machine and torque pulsations, simplified design of a modular machine, which makes it possible to implement different machine versions in one design for various voltages and currents, provision of the possibility to section anchor windings and to increase reliability, increase capacity in radial and axial directions.

2 cl, 3 dwg

FIELD: electricity.

SUBSTANCE: single-phase induction motor comprises a rotor and a stator with slots, where main and auxiliary windings are installed, forming nonsalient poles with displacement of magnetic axes relative to each other by half of a pole division. In the stator yoke in the field of slots arranged in zones of magnetic axes of the main winding, there are non-magnetic gaps with formation of saturation bridges.

EFFECT: higher start-up torque of a single-phase induction motor.

5 dwg

FIELD: electricity.

SUBSTANCE: magnetic system of a stator comprises radially magnetised polar permanent magnets, in the cross section having a shape of curvilinear pentagons facing the working gap with a curvilinear side. Between the pole magnets there are tangentially magnetised pole-to-pole permanent magnets installed, adjoining the pole ones via permanent magnets, supplementing the pole magnets to circular segments and magnetised in direction providing for coupling of magnetic flows of pole and pole-to-pole magnets.

EFFECT: higher magnetic flow of a magnetic system of a stator within specified dimensions.

1 dwg

FIELD: electricity.

SUBSTANCE: stator for an electric motor comprises a lengthy tubular body that defines a central cavity, in which a rotor may be installed. The rotor body defines a sequence of axial slots stretching in parallel to the axis of the body and a sequence of electric conductors stretching along channels for generation of electric windings. The rotor body is formed at least from two partially round segments of substantially one length. At the same time the segments determine the central cavity.

EFFECT: simplified winding, which results in increased reliability of a stator and an electric motor as a whole, reduction of costs.

FIELD: electricity.

SUBSTANCE: invention relates to electrical engineering, and namely to low-speed electric generators, and it can be used in wind-driven power plants. In magnetoelectric generator the rotor is provided with constant magnets 3, 4, and stator contains two parallel plates 5 and 6, between which annular windings 7 are arranged. The rotor is made of two parallel discs 1 and 2 fixed on shaft, on each of which ring-shaped rows of constant magnets 3, 4 are arranged. Polarity of constant magnets 3, 4 of each row alternates. Herewith poles of constant magnets 3, 4 of one row are faced to opposite poles of constant magnets 3, 4 of the other row. Annular windings 7 of the stator are made as equilateral trapezia with lateral sides 8, 9 located radially in relation to the rotor rotation axis 10 and areas 11, 12 of annular windings at trapezia bases are arc-curved; annular windings 7 are inserted by pairs one into another. Distance ℓ between areas of annular windings at the base of trapezia exceeds width b of ring-shaped row of constant magnets 3, 4. Constant magnets 3, 4 in each ring-shaped row join each other.

EFFECT: increasing power of magnetoelectric generator with preservation of its dimensions.

7 dwg, 1 tbl

FIELD: electricity.

SUBSTANCE: stator electromagnetic systems (EMS) of the electrical machine have a flat-topped shape with open poles facing the open poles of magnetic elements of the rotor, connected in pairs by magnetic bridges placed on the opposite side of the rotor relative the open poles of its magnetic elements. The distance between centres of poles of the stator EMS is equal to the distance between centres of poles of neighbouring magnetic elements of the rotor. The disclosed electrical machine has low material consumption of the structure owing to use of fewer magnetic elements in the stator EMS, simple technique of assembling and dismantling the structure owing to one-sided arrangement of the disc rotor relative the poles of the stator EMS, and the arrangement of the poles of the stator EMS in one plane enables to reduce the air gap between poles of the rotor and the stator, and the length of the middle magnetic line of the stator EMS, which considerably increases energy efficiency of the machine.

EFFECT: low material consumption and high manufacturability and energy efficiency of the structure of electrical machines with a disc rotor.

3 cl, 5 dwg

FIELD: electricity.

SUBSTANCE: field emission structures contain sources of electric or magnetic field. Amplitude, polarity and positions of magnetic or electric field sources are selected so that required correlation properties comply with the code. Correlation properties comply with required function of forces in all directions. Forces in all directions between field emission structures comply with relative centring, spatial distance and function of forces in all directions.

EFFECT: improving accuracy of objects centring.

11 cl, 3 dwg

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