Design of axial bearing with increased active steel fill factor
FIELD: machine building.
SUBSTANCE: design of magnetic axial bearing includes ring system of plates of electric steel, where separate steel plates (80, 90, 170) project radially outside, and neighbouring steel plates (80, 90, 170) in circumferential direction create clearance (20). Device also contains electrical coil inserted in system of electric steel plates to create magnetic field in the system. This system has at least two concentric rings (8, 9, 17) of the electric steel plates. In principle all adjacent electric steel plates (80, 90, 170) of each ring (8, 9, 17) of electric steel plates along the internal perimeter (14, 18, 19) of the appropriate ring of the electric steel plates touch each other. Using this charging (12) an increased active steel fill factor is provided in comparison with the traditional charge (11).
EFFECT: improved efficiency factor of magnetic axial bearing.
10 cl, 5 dwg
The present invention relates to the axial bearing device, comprising an electrical steel sheets, which separate the steel sheets are issued radially outward, and an electric coil, which is inserted in a system of electrical steel sheets to create a magnetic field in a system of electrical steel sheets.
Active axial magnetic bearings are used to regulate contactless required distances between two objects. The design principle of the axial bearing of this kind is shown in Fig.1. In this example, the shaft 1 is supported in the axial direction. Steel plate 2 is concentrically attached to the shaft 1. Along with a steel disk 2, the axial bearing system has two annular electromagnets 3, 4 (here also called axial bearing devices, which are arranged on two sides of the steel plate 2 coaxially with him and with the shaft 1. While the electromagnets 3 and 4 are static and, for example, is fixed on the housing of the electric machine, a shaft, including a steel disk 2 rotates within the two electromagnets 3, 4.
The electromagnets 3, 4 are efforts on soft magnetic materials, such as steel disc 2. When properly configured, the electromagnets 3, 4 steel disc 2 contactless can be retained in a predetermined axial position between �electromagnetisme 3 and 4.
The electromagnets 3, 4 are, as a rule, are built with circular coils, which are located in the groove in the steel stator. Most often, the stator is made of steel massive. In massive steel stator field changes lead to vortex currents, which, in turn, create a counter rotating field. Worsens the ability to control magnetic bearings.
Eddy currents are reduced in a known manner by blending the steel of the stator pack. The blending of stators of axial bearings is known from the publication DE 69103756 T2. There is described the components of the stator and rotor magnetic thrust bearing with a correspondingly laminated construction. The leaves of the slats are curved so that their vertices lie in a common cylindrical plane. In addition, touching the side edges of the steel sheets of the slats are in common planes that are perpendicular to the axis of rotation.
From EP 0795881 A1 is known an electromagnetic device for pump for fuel injection. The stator of the electromagnetic device includes a plurality of electrical steel sheets, which are arranged around a Central spiral axis of the stator.
The object of the present invention is to improve the efficiency of the device for a magnetic axial bearing.
In accordance with the USA�AI with the invention this task is solved by a device of a magnetic axial bearing, includes
- ring system electrical steel sheets, which separate the steel sheets are issued radially outward, and the adjacent steel sheets in the circumferential direction to form a gap, and
- electric coil, which is inserted in a system of electrical steel sheets to create a magnetic field in a system of electrical steel sheets,
- system of electrical steel sheets has at least two concentric ring electrical steel sheets and
- essentially all of the adjacent plates of each ring electrical steel sheets at the inner perimeter of the respective rings of electrical steel sheets touch each other.
Ring system electrical steel sheets of the known design has the steel sheets, which are distributed continuously from the inner perimeter to the outer perimeter of the electrical steel sheets. Since the electrical steel sheets have the same width everywhere and on the inner perimeter adjacent to each other, on the outer perimeter are obtained correspondingly large gaps between adjacent sheets. Because of this, the fill factor of the active steel ring system electrical steel sheets of this kind are not very high. Therefore, the preferred way according�accordance with the present invention, the system of electrical steel sheets separated by at least two concentric rings of electrical steel sheets. The electrical steel sheets are distributed each ring of the electrical steel sheets is always from the inner perimeter to the outer perimeter. Because now the electrical steel sheets even outside of the at least two rings of electrical steel sheets are adjacent to each other on its inner perimeter, can achieve higher fill factor active steel, since the traditional system of electrical steel sheets single sheets of electrical steel in radial height substantially removed from the inner perimeter of the outer ring of the electrical steel sheets of the inventive system.
Preferably, the system of electrical steel sheets has three concentric rings of electrical steel sheets, the average of the rings electrical steel sheets forms a recess in which is inserted an electric coil. It is particularly preferable when the average ring electrical steel sheets has the same radial width as the inserted electrical coil. The manufacture of the device axial bearing is structurally simple.
In addition, the average ring electrical steel sheets can be is an opening in the axial direction to carry out�Oia cables to the electric coil. This has the advantage that the connecting wire for electrical coils can be output to the outside by the shortest route, while the magnetic circuit is disturbed only minimally.
In one of preferred embodiments the system of electrical steel sheets arranged in an annular pocket. Pocket stabilizes the system electrical steel sheets in two radial directions and in one axial direction.
System electrical steel sheets can be held in a pocket by one or more retaining rings. Thanks to this system of electrical steel sheets are also recorded relatively open side pockets.
When the retaining ring in cross section is T-shaped, it can keep in the pocket of the inner and outer ring of electrical steel sheets in the axial direction with geometric circuit. With only one retaining ring is fixed in the axial direction of the two rings of electrical steel sheets.
In addition, the average ring electrical steel sheets can be held in a pocket of the inner and outer ring of electrical steel sheets with geometric circuit. All of the electrical steel sheets, which here consists of three to�LEC electrical steel sheets, can be fixed in a pocket of a single ring, which, as mentioned above, for example, is T-shaped.
According to another preferred embodiment of the cavity between the steel sheets of the system of electrical steel sheets filled with resin. This stabilizes the individual sheets of steel between them and the whole system of electrical steel sheets and simultaneously provides the necessary electrical isolation.
Particularly preferably, the electrical machine can be equipped with an axial bearing device of this kind. Magnetic axial bearing ensures minimal friction losses.
Now the present invention is explained in more detail using the accompanying drawings on which is shown:
Fig.1: axial bearing according to the prior art;
Fig.2: top view of a fragment of the electromagnet of Fig.1;
Fig.3: top view of the system of electrical steel sheets of the annular electromagnet;
Fig.4: an enlarged view of a fragment of Fig.3 and
Fig.5: cross sectional view of the electromagnet of Fig.2 without coil.
Described in more detail below examples of the implementation are the preferred embodiments of implementing the present invention.
For example, a generator or other electrical machine has an axial bearing, as principally shown in Fig.1. E�ectromagnetic 3 and 4, axial bearing, i.e. the axial bearing system, the present invention have a structure which is described below in detail. This design is simple and results in high fill factor active steel and durable pair.
Fig.2 shows a top view of a fragment of one of the electromagnets 3, 4 (unit axial bearing). The electromagnet 3, 4 has an annular pocket 5, which in Fig.2 are only visible concentric walls 6, 7.
Ring 5 pocket filled with laminated inner ring 8 and the laminated outer ring 9. Between the two rings is an annular coil 10. As will be explained in connection with Fig.5, the inner ring 8 together with the outer ring 9 and the middle ring under the coil form 10 annular groove into which is inserted an annular coil 10.
Fig.3 are shown, the present invention view of the blending of the annular magnet. In the upper half of Fig.3 one can see traditional blending 11. In the bottom half of the laminated rings, by contrast, shows the proposed invention the blending 12.
Fig.4 shows an enlarged fragment of the ring of Fig.3. There is better you can see the differences between the traditional blending 11 and the present invention by blending 12. For sitovo apply conventional electrical steel sheets. They are everywhere the same thickness.
When traditional Chikh�Ofce 11, as with the present invention, the blending 12, single sheets of steel radial issued out. It is always star-shaped system of electrical steel sheets. In order to clarify the entire ring system of the electrical steel sheets is depicted with two different shahtovymi 11 and 12. In practice, of course, the system of electrical steel sheets will have only one of these two satovic around the perimeter.
Traditional blending 11 each steel sheet 13 in the radial direction is issued from the inner perimeter 14 to the outer perimeter 15. As individual sheets 13 steel on the inner perimeter 14 directly touch each other, due to the slotted design on the outer perimeter 15 between adjacent sheets 13 were always relatively large gap 16. The fill factor active laminated steel thus rings low, respectively.
In the present invention, the blending 12 includes at least two concentric rings of electrical steel sheets in the present example, three rings of electrical steel sheets, namely the inner ring 8 sheets of electrical steel, the outer ring 9 of the electrical steel sheets and located between the ring 17 of the electrical steel sheets. On the CX�may be put at risk Fig.3 and Fig.4 individual rings 8, 9 and 17 of the electrical steel sheets are always the same radial thickness. However, as can be seen from Fig.2, the radial thickness of the individual rings may be different. In particular, they can, as also explained in connection with Fig.5, also radially to go at each other.
The lower half of Fig.4 explains that the individual sheets 80, 90, and 170 are radially shorter than the leaves 13 steel blending traditional 11. Leaves 80 steel inner ring 8 of the electrical steel sheets is also not made integrally with the sheets 90 and 170 steel outer ring 9 of the electrical steel sheets and the middle of the ring 17 of the electrical steel sheets. Also the 90 sheets were not made integrally with 170 sheets of steel. Now this has the advantage that the individual sheets 80, 90, and 170 become each of the rings 8, 9 and 17 of the electrical steel sheets corresponding to the inner perimeter or, respectively, the inner radius 14, 18, 19 can touch each other. In this case, the fill factor of the active steel on the inner perimeter 14, 18, 19 always 100%, and it decreases corresponding to the outer perimeter of the respective rings 8, 9, 17 electrical steel sheets. As individual sheets 80, 90, 170 steel, however, does not extend from the inner perimeter 14 of the inner ring 8 of the electrical steel sheets to the outer peri�of ETP 15 of the outer ring 9 of the electrical steel sheets, the gap 20 between, for example, adjacent sheets 90 in the circumferential direction is significantly smaller than the corresponding gap 16 in the traditional blending 11. The reason for this is that the outer ring 9 of the electrical steel sheets has substantially more sheets 90 steel than the average ring 17 of the electrical steel sheets. This ring, in turn, has significantly more leaves 170 steel than the inner ring 8 of the electrical steel sheets. The inner ring 8 of the electrical steel sheets has the same number of sheets 80 steel, and electrical steel sheets with traditional blending 11.
With the help of three concentric rings 8, 9 and 17 of the electrical steel sheets is achieved a significantly higher fill factor active steel than traditional blending 11. The achieved axial force proportional to the fill factor of the active steel. Increasing effort is determined from the relationship of the fill factor of the active steel. For the system of electrical steel sheets, which includes only one ring, it turns out the coefficient f1 fill the active steel. The system of electrical steel sheets comprising three concentric rings of electrical steel sheets of the same radial thickness, f3 is obtained, the fill factor �active steel. Then the corresponding relation of the fill factor of the active steel of the following: f3/f1=1+s/(3ri), where s corresponds to the radial thickness, and rithe inner radius of the system of electrical steel sheets. In this case, when the characteristic sizes of electromagnets or, respectively, devices axial bearing out the importance of increasing efforts from 10% to 20%.
Fig.5 shows a fragment of the cross section of the proposed invention the device for axial bearing. In particular, in the cross section is clearly visible U-shaped pocket 5 with its outer wall 6 and inner wall 7. To the inner wall 7 adjacent laminated inner ring 8. To the outer wall 6 adjacent the laminated outer ring 9. Between the two rings 8 and 9 of the electrical steel sheets is the average ring 17 of the electrical steel sheets. The blending of separate rings 8, 9, 17 in Fig.5 is not visible.
Both rings 8, 9 electrical steel sheets are distributed in the axial direction 21 from the bottom 22 of the annular pocket 5 to the upper edges of the walls 6, 7. Medium ring 17 electrical steel sheets, by contrast, extends in the axial direction 21 is much less far. Due to this, in the axial direction over the middle ring 17 electrical steel sheets and between the outer ring 9 sheets electrical engineering�detailed technical steel and inner ring 8 of the electrical steel sheets is formed a groove 23 to the annular coil 10. However, in the drawing of Fig.5, this groove is not shown.
In the axial direction under the middle ring 17 electrical steel sheets here is the retaining ring 24. This ring has a T-shaped cross-section and is secured by screws 25 to the bottom 22 of the annular pocket 5. Radially spaced shoulders T-shaped in cross section retaining rings 24 are capturing the shelves 26 and 27 of the inner ring 8 of the electrical steel sheets and the outer ring 9 of the electrical steel sheets. Both rings 8, 9 electrical steel sheets are fixed in the pocket 5.
Both rings 8, 9 electrical steel sheets have, in addition, passing in the circumferential direction grooves 28, 29 in which the protrusions protrude middle of the ring 17 of the electrical steel sheets. In addition, the average ring 17 of the electrical steel sheets with geometric circuit (in the axial direction 21) is held between the inner ring 8 of the electrical steel sheets and outer ring 9 of the electrical steel sheets. Thus, by using a single retaining ring 24 these three rings 8, 9 and 17 can stay in the pocket 5. But in principle, can also be provided several retaining rings for attaching rings of electrical steel sheets.
Although the examples above are carried out with three concentric� rings of electrical steel sheets system electrical steel sheets may also consist of two concentric rings of electrical steel sheets or four rings of electrical steel sheets. When two rings of electrical steel sheets then, for example, one half is shown in Fig.5 middle ring electrical steel sheets would be connected integrally with the outer ring of electrical steel sheets, and the other half integrally with the inner ring of the electrical steel sheets.
For the annular coil 10 need carts cables. To this end, in the axial direction can be provided with corresponding openings or, respectively, the conclusions of the cables in the system of electrical steel sheets, and the pocket 5. In the example of Fig.5 pocket 5 in its bottom 22 has a hole 30. Since the system of electrical steel sheets here has three rings of electrical steel sheets, medium ring 17 electrical steel sheets can simply be interrupted at the place corresponding to the axial hole 30. Also there would have to be aborted, the retaining ring 24, which also can be seen in Fig.5. The inner and outer rings 8, 9 sheets of electrical steel, by contrast, remain closed. Solid blending here show other disadvantages compared to the composition of the�Noah, because the blending should be interrupted at the output of the cable so that the respective sheets can no longer be given out. Otherwise, there are significant additional processing costs to create the holes for the connecting wires.
To increase the mechanical strength of the cavity between sheets rings sheets of electrical steel may be filled with resin.
The preferred image of the present invention performs the function of a stator axial bearing device has in comparison with known devices high-fill factor active steel, which leads to a correspondingly higher force per unit area. Concentric system, including several rings, leads, in addition, to sturdy design that can be manufactured cost-effectively.
1. The device (34) of the magnetic axial bearing, which includes
- ring system electrical steel sheets, which separate the sheets (80, 90, 170) were issued radially outward and adjacent sheets (80, 90, 170) steel in the circumferential direction to form a gap (20), and
- an electric coil (10) which is inserted in a system of electrical steel sheets to create a magnetic field in a system of electrical steel sheets,
characterized in that
system l�ists electrical steel has at least two concentric rings (8, 9, 17) electrical steel sheets and
- essentially all of the adjacent sheets (80, 90, 170) each steel rings (8, 9, 17) electrical steel sheets at the inner perimeter of each ring (8, 9, 17) electrical steel sheets touch each other.
2. The magnetic axial bearing according to claim 1, wherein the system electrical steel sheets has three concentric rings (8, 9, 17) electrical steel sheets, the average of the rings electrical steel sheets forms a recess (23) is inserted into the electrical coil (10).
3. The magnetic axial bearing according to claim 2, wherein in the middle ring (17) electrical steel sheets is an opening in the axial direction for holding the cables to the electric coil (10).
4. The magnetic axial bearing according to one of claims.1-3, and the system of electrical steel sheets arranged in an annular pocket (5).
5. The magnetic axial bearing according to claim 4, wherein the system electrical steel sheets is held in a pocket (5) at least one retaining ring (24).
6. The magnetic axial bearing according to claim 2, wherein the system electrical steel sheets is held in a pocket (5) at least one retaining ring (24), wherein the specified at least one abstain�ing ring (24) in cross section is T-shaped and holds in the pocket (5) internal and the outer ring (8, 9) electrical steel sheets in the axial direction (21) with geometric circuit.
7. The magnetic axial bearing according to claim 6, wherein the secondary ring (17) electrical steel sheets is held in a pocket (5) inner and outer ring (8, 9) electrical steel sheets with geometric circuit.
8. The magnetic axial bearing according to one of claims.1-3, 5-7, and the cavity between the sheets (80, 90, 170) steel system electrical steel sheets filled with resin.
9. The magnetic axial bearing according to claim 4, wherein the cavity between the sheets (80, 90, 170) steel system electrical steel sheets filled with resin.
10. Electric machine equipped with a device (3, 4) axial bearing according to one of claims.1-9.
SUBSTANCE: stepping motor comprises a stator with teeth and slots made at its inner bore and alternated in the circumferential direction and axial direction. Phase coils are placed at the teeth, and their beginnings are connected to the neutral wire of the power supply source while their ends are connected to a switching device intended for the connection of respective phases of the power supply source. A control unit of the switching device can switch five phase coils forming either an arched or a longitudinal row, with one phase sequence up to the midpoint of the row and opposite phase sequence in the row after the midpoint, simultaneously in order to fixate the rotor. The rotor of the stepping motor comprises an electroconductive part made as a cylinder with a cut along the whole length.
EFFECT: consecutive and longitudinal movement of the smooth rotor.
SUBSTANCE: pole package of synchronous generator rotor contains multitude of pole package segments (101-106) shifted in regards to each other, and each element has multitude of identical steel sheets of the pole package. Each steel sheet of the pole package has pole core (110) with the first midline (118) and pole tip (120) with the second midline (128). Distance between the first and second midline is different at least in neighbouring segments (101-106) of the pole package.
EFFECT: mass and dimensions parameters are improved.
6 cl, 5 dwg
SUBSTANCE: electrical machine comprises the stator bearing housing, imbricated stator core with slots on its outer cylindrical surface with winding coils placed into the above grooves. Stator is arranged inside the rotor cylindrical cavity. The rotor comprises an inductor coil. The rotor body is implemented as two discs from non-magnetic material detachably attached to each other and faced to each other with their cavities. The parallelepiped-shaped permanent magnets of the inductor coil and non-magnetic trapezoidal wedges are implemented as bars aligned with a longitudinal axis of the rotor and installed with formation of a composite ring with alternation of pole polarity. The electrical machine is fitted with the radial and thrust magnetic bearing assemblies located on ledges of the bearing housing of the stator and L-shaped cylinders, coaxial with them, implemented on plates of the rotor housing. On cylindrical ledges of the bearing housing of the stator the stator parts of composite permanent magnets forming the Halbach magnetic circuit are rigidly fixed. On the surfaces of L-shaped cylinders facing towards them the rotor parts of composite permanent magnets forming the Halbach magnetic circuit are fixed. Composite permanent magnets form radial bearings.
EFFECT: reduction of mass-dimensional characteristics, improvement of reliability of operation, increase of electrical machine service life.
2 cl, 2 dwg
SUBSTANCE: rotor for electrical machine is offered which contains: the plates formed over each other (415) with radially passing grooves (140), located along its periphery, and the first facet (520) on the surface (550) of each groove (140) and the named groove (550) is matched with a wedge (150). The first facet (520) connects the named surface (550) and the first side (418) of the plate (415). The first facet (520) and each plate (415) can have the isolating coating.
EFFECT: elimination of electric contact between plates because of jamming when the surface of the collected rotor matched with the wedge has to be additionally machined.
20 cl, 20 dwg
FIELD: machine building.
SUBSTANCE: rotor system of magnetoelectric machine contains a casing of the turbine block, shaft installed turbine, the shaft installed in bearings, a generator casing, a rotor. The rotor contains uniformly installed permanent magnets, magnetised in radial direction with alternating polarity. Turbine and rotor are installed on same hollow shaft, with possibility of coolant pumping through its cavity by the pump installed at the turbine side. At end of the hollow shaft a spiral channels are made. The hollow shaft with rotor creates a cylinder with permanent cross-section, on its external surface a bandage shell is installed out of high strength non-magnetic material. The bearings can be made in form of the contact-free gas supports, electromagnetic bearings or hybrid magnetic bearings.
EFFECT: minimised heating of the permanent magnets, and heat transfer between the turbine shaft and generator shaft, increased rigidity and mechanical strength of the system due to the generator shaft and turbine shaft making as single hollow shaft with possibility of the coolant pumping through its cavity, and spiral grooves making at the rotor end.
4 cl, 3 dwg
FIELD: machine building.
SUBSTANCE: rotor for a rotating electrical machine includes the following: a rotor core with a hole for magnet insertion passing inside, a magnet inserted in the hole for magnet insertion, and an insulating filler filling the space between the inner wall of the hole for magnet insertion and the magnet in order to fix the magnet. The magnet is fixed by the filler so that the magnet surface inside the hole for magnet insertion is inclined to the direction of passing of the inner wall in the hole for magnet insertion.
EFFECT: minimisation of losses from eddy current through the magnet which makes processing of magnet surface by insulating film unnecessary.
10 cl, 13 dwg
SUBSTANCE: fixed part of the electrical machine consists of laminated magnetic core stacked out of separate steel insulated plates jointed into a pack by weld seams made at outer side of the magnetic core. The magnetic core is fixed in the housing by spline connection centred along lateral surfaces. In the housing there is a cooling main placed in the middle part of the magnetic core from outside. Between the housing and the stator magnetic core there is a circular cooling chamber divided by splines into circular sectors insulated from each other, at that cooling liquid is supplied from the cooling main. The rotatable part consists of the magnetic core, as boss and a setting disc of the rotor angular position sensor having circular toothed surface shaped as a truncated cone.
EFFECT: design of an electrical machine with forced liquid cooling having high power performance and low noise level.
15 cl, 2 dwg
FIELD: machine building.
SUBSTANCE: rotor of high-speed generator contains shaft with installed rotor yoke with permanent magnets, and bandage enclosure. The rotor contains rods with possibility of their installation in holes made in permanent magnets and end surfaces of the rotor yoke.
EFFECT: increased reliability and durability of the rotor of high speed generator, improved energy characteristics.
SUBSTANCE: electrical machine cooling device comprises a stator with axial cooling channels, Peltier's module, the junctures of which are electrically isolated from the electrical machine structure. Cold junctures of Peltier's module are interfaced to the external surface of the stator package, and hot ones are interfaced to the internal surface of the electrical machine housing. Peltier's module is heat isolated by its 1/5 of the section from hot junctures. Peltier's module is connected by electric terminals to DC power supply - the thermocouple battery, the hot juncture of which is located in the combustion chamber of the aviation engine, and the cold juncture - on the housing of the input part of the aviation engine interfaced to the air inlet.
EFFECT: use of thermal energy of aviation engine for power supply of active cooling system.
SUBSTANCE: invention is referred to electrical machine with permanent magnet comprised of stator and rotor designed to rotate in stator and method and for this machine designing. The electrical machine contains rotor with permanent magnets and stator having coils wound on the stator rotors for interaction with magnets through air gap. Rods and coils are covered by circular body of the stator. There is a chamber with cooling medium for coil cooling. The stator body comprises two matching segments, which set stator rods and coils in the machine. Each segment is formed of reinforced plastics. At least one segment has pole tips of the stator rods, which are made on its top.
EFFECT: simplification of the machine production and assembly.
26 cl, 24 dwg
SUBSTANCE: invention relates to electrical engineering. Imbricated core of a combined journal and thrust magnet bearing is made as a pack of coated plates with at least one radial cut in each plate. These cuts prevent induction of eddy currents induced by changes in axial control magnet fluxes passing through the central opening of the imbricated pack. Magnetic symmetry is maintained due to turn of each plate of the imbricated core in regard to the previous plate per a certain angle.
EFFECT: reduced losses in the bearing and improved efficiency in operation of the axial channel.
11 cl, 21 dwg
SUBSTANCE: electrical steel coating method using lacquer composition for charged core involves application at least of one coating layer of lacquer composition and curing of the applied layer. Lacquer composition for charged core contains 5-95 wt % at least of one alkyd resin with OH nucleophilic groups, 0-70 wt % at least of one polyamid resin containing groups of amide of α-carboxy-β-oxocycloalkylcarboxylic acid, and 5-95 wt % at leas of one organic solvent and/or water. Weight fraction in percents is calculated relative to total weight of the coating composition.
EFFECT: method ensures excellent adhesion and corrosion resistance of coatings, as well as compliance with high-profile standards in combination with various technical requirements.
10 cl, 3 tbl
FIELD: electrical engineering; three-phase transformers.
SUBSTANCE: proposed flat magnetic system has three legs and two yokes. System stacks are assembled of identical groups of layers, three ones per group. External and internal outlines of all layers are rectangular. External outlines of all layers coincide. All laminations are rectangular. Each stack is assembled of similar sets of laminations of four type varieties. Laminations of all stack legs are identical. Yoke laminations are of three type varieties equal in length and different in width. Wide and intermediate, intermediate and narrow ones differ in width by same and small value. Top yoke lamination in first layer of group is narrow and that of bottom one, wide. Laminations of top and bottom yokes in second layer are identical and medium in width. Top-yoke lamination in third layer is wide and bottom-yoke one, narrow, Leg laminations of first layer are displaced upwards and those of third layer, downwards relative to those of second layer. All interleaving joints are horizontal. Group layers are assembled so that joint lines of laminations are disposed at different heights for each layer of group. In this way three-layer alternating interleaving of joints is attained to afford better distribution of magnetic field at corners of magnetic system compared with prior-art one.
EFFECT: reduced active and reactive saturation power loss at magnetic system corners, provision for automatic control of process.
1 cl, 1 dwg
FIELD: electrical engineering; transformer construction engineering.
SUBSTANCE: proposed laminated magnetic circuit of transformer has three legs and two yokes assembled of lamination stacks of similar groups of layers. Each layer has similar set of laminations, each incorporating one lamination of two extreme and intermediate legs, two laminations of upper yoke, and two laminations of lower yoke which are beveled at corners. Laminations of extreme legs 1 and yokes 2 are trapezium-shaped and beveled at extreme corners through 45 deg. Laminations of intermediate leg 3 are higher than those of legs 1, symmetrically shaped over two relatively perpendicular axes, with top angles 2α° and are relatively shifted in each group of layers along axis toward lower and upper yokes through pitch A. Laminations of yokes 2 have bevel toward extreme legs at angle of 45 deg. and toward intermediate leg, at angle of (90 - α) deg. Auxiliary gap in joints between laminations of one layer is overlapped by laminations of preceding and next layers.
EFFECT: facilitated pre-manufacture procedures and manufacture of transformer magnetic circuit.
1 cl, 4 dwg
FIELD: electrical engineering; oil-immersed power transformers.
SUBSTANCE: system stacks are built of similar groups of layers, three layers per group. Inner and outer contours of all layers are rectangular in shape. Inner and outer contours of all layers are aligned. Plates of legs are rectangular and trapezoidal and those of yokes are trapezoidal and beveled through 45 deg. All layers of each stack are assembled of similar sets of plates of five type varieties. Plates of first layer of extreme left and intermediate legs are trapezoidal and those of extreme right leg are rectangular. All plates of second layer are disposed as mirror images of axis drawn over outer vertical edge of extreme right leg plate. Central-leg plate of third layer is rectangular. Group layers are assembled so that junction areas of plates on straight lines are different for each layer of group. Such design ensures better distribution of magnetic field flux density at magnetic system corners compared with prior art.
EFFECT: reduced loss at magnetic system corners.
1 cl, 4 dwg
FIELD: machine building.
SUBSTANCE: method of unloading of bearing in electromechanical energy converters includes creation of two opposite forces directed towards the axial axis, one force is axial force of the winding with current located in stator slots, it is made by making chamfer of the stator slots at definite angle, at that this force value is determined by product of this angle sine and current in windings, and induction in air gap, and another force is axial magnetic force crated as result of interaction of the stator and rotor fields.
EFFECT: unloading of bewaring supports of electromechanical energy converter without its design complication, thus increasing its reliability due to creation of two opposite forces.
3 dwg, 1 ex
SUBSTANCE: superconductive suspension magnetic apparatus for kinetic energy storage device (KNESD) is installed in KNESD frame connected with vacuum pumping system, it includes stator made as a body containing a block of high-temperature superconductive elements (HTSCE) with cooling system, permanent magnets installed at the rotor shaft with a gap in regard to the stator frame. The stator frame is equipped with independent vacuum pumping system, at that exhaust of the above system is connected to cavity of KNESD frame. The stator frame is also equipped with passive gate valves made as bushings fixed at end surfaces of the apparatus body matched to the shaft, at that inner diameter of the bushings exceeds diameter of the rotor shaft per 0.5-1.5 mm, and their axial dimension is 50-100 mm.
EFFECT: simplified design, increased operational efficiency of the vacuum system, and facilitation of testing for independent process testing of the suspension apparatus.
FIELD: machine building.
SUBSTANCE: invention relates to machine building, namely to a controlled gas magnetic bearing assembly and to the method of its operation. The bearing assembly comprises a solenoid, magnets, poles and armatures of electric magnets, a gas bearing shell, holes for porous inserts, a jacket, winding of electric magnets, a chamber to supply gas-film lubrication to the porous inserts, fasteners for gap measuring sensors, a hole to supply gas-film lubrication to the chamber. The solenoid is mounted on a shaft. The magnets are mounted between the holes of the bearing shell. The electromagnets are installed in the support casing longitudinally. The gas bearing shell is built-in in the support. The holes for the porous inserts are set in the gas bearing shell. The jacket embraces the bearing shell. The chamber to supply gas-film lubrication is located between the bearing and the jacket. The fasteners for gap measuring sensors are located at the poles of the electromagnets. The hole to supply gas-film lubrication is located in the jacket. Method of the controlled gas magnetic bearing assembly operation involves the generation of the additional electromagnetic force aimed at the increase of load-carrying capacity of the bearing assembly. The magnetic force is additionally created, it is controlled by the change of current in the electromagnets; the usage of the gap measuring sensors allows for accurately controlled rotation of the shaft in the support and small change of gas layer thickness, and the longitudinal arrangement of the electromagnets allows for the reduction of magnetic friction due to the longitudinal direction of the magnetic flux.
EFFECT: decreased change of the air gap.
2 cl, 1 dwg
SUBSTANCE: high-rate magnitoelectrical machine with vertical shaft comprises a stator and a rotor mounted on the vertical shaft. In the machine there are hybrid magnetic bearings made of electromagnets - two radial bearings and one axle bearing; in their magnetic core there inserts made of permanent magnets. At that each insert of permanent magnets is magnetised in direction of the power line of magnet flux generated by the electromagnet winding. Magnet bearings based on permanent magnets are mounted as additional thrust bearings, at that at the rotor side where axial forces have maximum value the magnet bearings based on permanent magnets are mounted so that they are capable of repulsive interaction and at the opposite side if the rotor the magnet bearings based on permanent magnets are mounted so that they are capable of attractive interaction.
EFFECT: increased reliability, energy efficiency, power parameters and rigidity of a hybrid magnetic bearing, minimisation of loads to hybrid magnetic bearings.
FIELD: machine building.
SUBSTANCE: magnetic bearing assembly contains casing (1), in which magnetic thrust and radial bearings are installed. Rotation axis of the rotor (7) is oriented vertically. Thrust bearing block is installed under thrust journal (8), at that the journal (8) contains cylindrical groove (12), on its bottom the composite permanent magnet (3) is installed, as minimum it contains three ring coaxial permanent magnets, odd magnets starting from the outermost are magnetised radially and look each other by like poles, and even magnets are made with axial magnetising. The ring permanent magnet (2) secured in the casing (1) is made similarly. The rotor top part (7) projecting above the journal (8) has the sleeve shape (6), and central part of the cover (5) is equipped with cylindrical projection (13) made with the possibility of insertion in the cavity of the rotor top part (7). On the internal surface of the sleeve (6) minimum three ring permanent magnets (9) of the radial bearing are rigidly secured above each other. On the surface of the cylindrical projection (13) of the cover (5) looking on the cavity surface of the rotor top part (7) minimum three ring permanent magnets (11) of the radial bearing are rigidly secured above each other, in terms of dimensions and direction of intensity of magnetisation are similar to those of the secured on the internal surface of the sleeve (6), but shifted relatively to them through vertical. The external surface of the sleeve (6) and cylindrical edge of the journal (8) are provided with bandage (14, 15) made by coiled high strength fibres on the binding agent out of solidified synthetic resin. The journal (8) and rotor (7) are hollow and are mainly equipped with the radial reinforcement ribs (16, 17).
EFFECT: assurance of high carrying capacity of thrust and radial bearing assemblies under operation mode with reduced friction losses, improved operation reliability, improvement of mechanical efficiency of the turbine generator.
2 cl, 4 dwg