Rotor (armature) of electrical machine (versions)

FIELD: electrical engineering.

SUBSTANCE: core plates are made in the area of internal diameter with slots concentric in relation to this diameter at least in two rows; at that there are at least two slots in each row and bridges between slots are located in the middle of slots in the next row; at that joining of elements fixing core ends to the shaft is made at radial depth from the first row of concentric slots and joining of axial fixing elements to core ends is spread in radial direction to the shaft not farther then the last row of slots from the shaft.

EFFECT: prevention of impact of unevenly compacted rotor core on the rotor shaft of an electrical machine.

4 cl, 5 dwg

 

The invention relates to the field of electrical engineering.

Widely known rotors of electrical machines, AC and anchor electrical DC machines, conductive cores are collected from the leaves in the form of rings, made of electrical steel sheet with grooves in the region of the outer diameter to accommodate the windings and are held on the shafts in the axial direction using a mechanical pressure rings, the shaft is a kind of axial coupler core. Special group of squirrel-cage rotor induction motors with cast resin winding, in which the core is held in the axial direction of the winding rods and rings short role respectively axial couplers and end of the pressure rings.

Axial mounting of the cores on the shafts usually hard, for example, on one side end control ring abuts against a shoulder on the shaft, and on the other side end control ring fixed on the shaft o-ring plug, or planted on the shaft with an interference fit locking ring (see, for example, Aeoliki "Design of electrical machines", 1958, SEI, s, Fig.7-1, 7-2). Cores squirrel-cage rotor induction motors with cast resin winding, at least a large (for example, a bipolar power up to 1000 kW), to epada on the shafts in the axial direction similar to - on the one hand the actual core connected with the shoulder on the shaft of the rotor, on the other hand is fixed by a locking ring mounted on a shaft with a guaranteed fit.

Special and indispensable quality assurance and thereby long-term performance of the rotors of electrical machines is the moulding cores certain pressure.

Considering weakening the pressing of cores in the process of operation is recommended surface pressure molding cores in the manufacture of rotors at level 7÷10 kg/cm2(Wideman, Callenberger "Design of electrical machines", 1972, Energy, Leningrad branch, p.153), and even 10÷20 kg/cm2(Aeoliki "Design of electrical machines", 1958, SEI, s). This refers to the rotors, the cores are assembled on the rotor shaft.

In rotors of induction motors with die-cast squirrel-cage winding unit pressure cores is estimated as the product of the yield strength of the material of the terminals of the winding of the rotor and the relationship of the cross-section of all the rods to the leaf area of the rotor.

It is also known that rolled electrical steel is ethnotaxonomy, mainly on the width of the sheet (roll), resulting in the rotor leaves the radius and the circumference about nazyvautsa raznomastnye. When the moulding cores of rotors collected from such sheets, their individual areas (volumes), randomly located along the length and circumference of the core, overly dense, others clubsbrisbane. When this residual "spacer" effort in the core after fixing it on the shaft and relieve pressure press (or after pouring in the core of the rotor is short-closed winding and removal of foundry tooling) will be also distributed unevenly and there will be more in the areas (volumes), where the core is the most dense.

In many cases unevenly compressed core, even made of cold-rolled steel with extremely low allowable thickness variation, random warps the rotor shaft. Thus, the center of gravity of the rotor is offset relative to the axis of rotation, broken balance of the rotor, increases the vibration of the electric machine. Warming up the rotor in a machine running under load, uneven crimp core, the curvature of the shaft of the rotor, unbalance and vibration of electrical machines increase. Most clearly all this is reflected in large high-speed electric machines, where the diameters of the shafts are relatively small, the outer diameters of the cores of the rotors commensurate with the width of the sheets (rolls) electrical steel, and the amount of leaf is in the cores reaches 1500-2000 PCs and more.

Recommended and used almost a whole range of activities designed to reduce uneven in length and the circumference of the molding cores of rotors (anchors), caused by the thickness of the sheets of the rotor, namely:

- rotate 90° half blanks sheets of the rotor, so that when the Assembly of the core zones of the sheets with a maximum width alternated with zones of leaves with the lowest thickness;

- execution leaves the rotor with two and even three keyways to not turn the workpiece in the manufacture of sheets, and the sheets in the Assembly core;

control density crimp cores special probe ("control knife") with a recommendation to consider the density crimp satisfactory when "control of the knife" at a certain effort is not radially between the leaves or enters to a depth of not more than 2 mm, while excessive uneven crimping, for example, when entering "control of the knife", a depth of a lot more than 2 mm;

at least partial pereshihtovki core with the replacement of a certain number of sheets (see, for example, Dimplomacy "Technology major electrical engineering", Chapter 3, "Big machine", Energoizdat, Leningrad branch, 1991, p.146-148).

However, all these measures do not solve the problem.

The disadvantage of the considered rotors (anchors) when the x machines, including squirrel-cage rotor induction motors with cast resin winding, is the absence in these rotors structural elements, excluding the adverse impact of non-uniformly compressed along the length and circumference of the core on the rotor shaft with a mandatory provision in the core required residual "spacer" efforts to ensure its long-term health conditions.

Known squirrel-cage rotor of an induction motor according to the patent of the Russian Federation (No. 2044382, NC 1/26, 1992), in which the influence of the core on the shaft suggested to reduce the constructive measures. New this rotor is that the rotor core is made from leaves in the form of rings of electrical steel sheet with grooves in the area of the outer diameter to accommodate the winding of the rotor is made of packages, separated auxiliary packets from the same electrical steel with an outer diameter of sheets in these accessory packages not exceeding the diameter of the base of the teeth (the formula), whether the average diameter of the back core of the rotor (figure 1 description). In this and in another case it is impossible to ensure the requirement for the penetration of "control of the knife" in the core between the sheets to a depth of not more than 2 mm (see the above-mentioned monograph Dimplomacy), because this is artechnic cannot be pressed over the entire area of its cross section, because any pressure will be perceived only the Central part of a core with a diameter equal to the diameter of sheets helpers core, and subzoba area will always remain neobrazovannoi.

This lack of structure, as in neobrazovannoi the zone of possible vibration of the teeth of the sheets of the rotor core, increased noise levels and even cliffs of teeth of the sheets of the rotor core.

Known also adopted for the prototype rotor of the motor by Japan patent (No. 61-48335 from 23.10.86, NC 1/28), which proposed to reduce the impact on the rotor shaft unevenly compressed core structural measures. The core is assembled from sheets in the form of rings of electrical steel sheet with grooves in the region of the outer diameter to accommodate the windings of the rotor. On the shaft core fixed in a pressed state by the adjusting rings and dowels. While the compression ring into the inside diameter is made with side grooves on the sides facing the ends of the core and the pins placed in the annular grooves of the shaft is elastic in the axial (along the shaft) direction, i.e. the core is provided free raspushenny" in the area of the inner diameter in the lateral grooves of the rings push, and the whole system of the axial fastening of the core by reducing the hardness number is TS pushbuttons and elastic wedges have become more pliable in comparison with previously used rigid mounting.

The proposed design has really weakened the influence of rotor core on the shaft, resulting in markedly decreased vibration motor. This is confirmed by the experimental data according to the vibration level of the engine at different speeds from the core construction of the rotor with the rotor of conventional design, and with the rotor of this invention. In the latter case, the vibration level is lower at the same time, however, the nature of the change in the vibration. This last fact suggests that fundamental changes in the relationship unevenly compressed core with the shaft did not happen. Just in the rotor of this invention when the same, apparently, as in the prototype pressure source crimp, due to the greater flexibility less rigid rings push dowels and elastic core of the rotor after removing the pressure of the press is also somewhat lengthened, the residual "spacer" effort in it has decreased and that determined the lesser curvature of the shaft and reducing engine vibration. The same result could be obtained in the rotor with rigid mounting of the core on the shaft by reducing the pressure of the pressurization of the core until a residual "spacer" efforts in the core of the rotor under the patent would have decreased stepanianarmenia crimp core, the impact of the core on the shaft, the curvature of the shaft and the vibration of the engine.

Therefore, it is not entirely clear and the possible scope of the invention, i.e., if the rotor is made with rigid mounting of the core on the shaft and with the minimum necessary to achieve its long-term performance of the residual "spacer" effort and unevenly obrusoviny core unacceptably distorts the rotor shaft, to use the invention, since this residual "spacer" effort in the core will be less than the minimum required and will not be provided long-term performance of the rotor. If using elastic elements for attaching the core to compress it to high pressure, so that after removal of the residual pressure press "spacer" effort in the core corresponded to the minimum necessary to achieve long-term performance of the rotor, the impact unevenly compressed core on the shaft will be the same as when hard his mount. Essentially - the use of the invention or unreasonable, when it is possible to reduce the impact on the shaft unevenly compressed core by simply reducing the pressure crimping, or impossible, when using the invention cannot be achieved in the core of the required residual is "spacer" effort to ensure long-term performance of the rotor.

The lack of considered design - the absence of a change in the relationship of the core to the shaft of the rotor compared to its prototype.

The main objective of the present invention, the design of the electric machine rotor of an alternating current (armature electric DC machine), in which uneven along the length and circumference of the moulding core, at least when used for the manufacture of sheets of the rotor cold-rolled steel, would not bend the shaft of the rotor (armature) at any required pressure molding cores.

The technical result is achieved by the fact that:

in the rotor of the electric machine containing the shaft, the core of the sheets in the form of rings of electrical steel sheet with grooves in the area of the outer diameter to accommodate the windings of the rotor, squirrel cage winding, molded from conductive material in the form of rods and rings short, the elements of the axial fastening of the core on the shaft, the core sheets in the area of the inner diameter is made with concentric relative to that of the diameter of the slots located in at least two rows and the slits in each row, at least two, jumper between the slits in each row are located in the middle of the slits of adjacent rows, with Mgr is Genie the ends of the core elements of its mounting on the shaft is made on a radial height from the shaft to the first series of concentric slots, fit the ends of the core rings short in the radial direction to the shaft extended no further than the latest from the shaft of a number of concentric grooves;

in the rotor (armature) of the electric machine containing the shaft, the core of the sheets in the form of rings of electrical steel sheet with grooves in the area of the outer diameter to accommodate the windings of the rotor (armature), the front pressure ring, the winding of the individual rods and rings short or of isolated coils (rods), as well as the elements of the axial fastening of the core, including the shaft, the core sheets in the area of the inner diameter is made with concentric relative to that of the diameter of the slots located in at least two rows, with each row of slots of at least two, bridges between the slots in each row are located in the middle of the slits of adjacent rows, and the fit to the ends of the core elements of its mounting on the shaft is made on a radial height from the shaft to the first series of concentric slots, fit to the core end of the pressure rings in the radial direction to the shaft extended no further than the latest from the shaft of a number of concentric slots, and the core with end pressure rings in the pressed state is retained axial couplers;

in the rotor (armature) of the electric machines is concentric slots in the inside diameter of the core sheets of the rotor is made in the leaves end packet core.

The proposed design is illustrated by drawings, which show:

- figure 1 is a longitudinal section of the rotor of an electric machine with a cast squirrel cage winding and with the execution of concentric slots in the leaves of the core along its length (B-B in figure 2);

- figure 2 is a cross section of the rotor (armature) of the electric machine (A-a in figure 1, 3, 4, 5);

figure 3 is a longitudinal section of the rotor of an electric machine with a cast squirrel cage winding with the implementation of concentric slits in the leaves end packet core (B-B in figure 2);

- figure 4 is a longitudinal section of the rotor of the electric machine with squirrel-cage winding with the execution of concentric slots in the leaves of the core throughout its length (B-B in figure 2);

- figure 5 is a longitudinal section of the rotor (armature) of the electric machine winding of insulated coils (rods) with the execution of concentric slots in the leaves end packet core (B-B in figure 2).

The rotor core 1 in variants 1 and 4 consists of the same sheet in the form of rings of electrical steel sheet, which in the area of the outer diameter is made with slots for the windings of the rotor and the inside diameter of the shaft 2 with concentric slots 3 and 4, arranged in two rows at different distances from the shaft 2. Jumper 5 between the slots 3 and 4 in each row are poser the Dean of the slits of adjacent rows. Core 1 options 1 and 3 is held in a pressed state by the rods 6 and short rings 7 rotor winding, in this case obtained by pouring in the rotor core 1 molten, for example, aluminum, and options for 4 and 5 - axis couplers 8 (for example, pins or rivets) and end pressure ring 9. The rotor winding in these variants collected from individual rods 10 and closed rings 11, or from a separate isolated coils or rods 12. In the axial direction on the shaft 2 core 1 podbrezova sleeve 13, mounted on the shaft 2, for example, with tension.

The main part of the core 1 from the outer diameter to the first from the shaft 2 of a number of concentric slots 3 with its Central part from the shaft 2 to the first from the shaft 2 of a series of concentric grooves 3 is connected by means of a very pliable in the axial direction (along the shaft 2) elements 14 formed in the leaves of the rotor concentric slots 3 and 4 and the ridges 5 between them. These are very malleable in the axial direction of the elements 14 provide the necessary freedom for axial deformations relative to the shaft 2 all the most dense ("pararescuemen") areas (volumes) of the core 1 from the first shaft 2 adjacent concentric slots 3 without gear on the shaft 2 any significant axial forces. However, the core 1 Roto is and rigidly fixed to the shaft 2 in the radial directions - radial displacement of the main part of the core 1 from the outer diameter to the first from the shaft 2 of a number of concentric slots 3 relative to the shaft is not possible.

The radial size of the concentric slots 3 and 4 can be arbitrary and is determined by the ability of the manufacturer, however, it is advisable to run it as low as possible equal to, for example, the tenth fractions of a millimeter.

In some cases, in order to reduce the complexity of the manufacturing process, it is acceptable to perform the core 1, as shown in figure 3 and 5, with concentric slots 3 and 4 in the leaves only end packet core 1 of the rotor.

Rigidly connected with the shaft 2 of the Central part of the core 1 from the shaft 2 to the first number of concentric slots 3 in the presence in this part of the core 1 uneven crimp twisting shaft 2 can't because of the smallness of the non-uniformity of crimp and residual "spacer" effort in it, since a very small radial size of this part of the core 1 in comparison with the radial size of the whole leaf of the rotor core 1.

Can't bend the shaft 2 and the average packet core 1 of the rotor 3 and 5, made of sheets without concentric slots 3 and 4 even when the unevenness of its crimp, because of the great stiffness of the shaft 2 by bending the length of this middle lamination 1.

During operation of the electrical machine the od of the load unevenly laminated core 1 of the rotor is heated, will be the most arbitrary deformation of the body from the outer diameter to the first from the shaft 2 of a number of concentric slots 3, the maximum in the areas (volumes) of the core 1, the densest ("prepressing"). It is very supple in the axial direction of the elements 14 will not pass on the shaft 2 effort, able to bend.

Stiffness and strength are very malleable in the axial direction of the elements 14 in the radial and tangential directions for exclusion radial relation to the shaft 2 moves the main part of the core 1 and the transmission torque is quite sufficient.

The claimed invention can be used for all asynchronous motors: ASM, ASM, ADO, ASPS, in synchronous machines with laminated rotor: GTG-2500 etc.

1. The rotor of the electric machine containing the shaft, the core of the sheets in the form of rings of electrical steel sheet with grooves in the area of the outer diameter to accommodate the windings of the rotor, squirrel cage winding, molded from conductive material in the form of rods and rings short, the elements of the axial fastening of the core on the shaft, characterized in that the sheets of the core in the area of the inner diameter is made with concentric relative to that of the diameter of the slots located in at least two rows, with slots in which each row of at least two, bridges between the slots in each row are located in the middle of the slits of adjacent rows, and the fit to the ends of the core elements of its mounting on the shaft is made on a radial height from the shaft to the first series of concentric slots, fit the ends of the core rings short in the radial direction to the shaft extended no further than the latest from the shaft of a number of concentric slits.

2. The rotor of an electric machine according to claim 1, characterized in that the concentric slits in the inside diameter of the core sheets of the rotor is made in the leaves end packet core.

3. The rotor (armature) of the electric machine containing the shaft, the core of the sheets in the form of rings of electrical steel sheet with grooves in the area of the outer diameter to accommodate the windings of the rotor (armature), the front pressure ring, the winding of the individual rods and rings short, or of isolated coils (rods), the elements of the axial fastening of the core, including the shaft, characterized in that the sheets of the core in the area of the inner diameter is made with concentric relative to that of the diameter of the slots located in at least two rows, with each row of slots is not less two jumpers between the slits in each row are located in the middle of the slits of adjacent rows, which is fit to the ends of the core elements of its mounting on the shaft is made on a radial height from the shaft to the first series of concentric slots, fit to the core end of the pressure rings in the radial direction to the shaft extended no further than the latest from the shaft of a number of concentric slots, and the core with end pressure rings in the pressed state is held in the axial buckles.

4. The rotor (armature) of the electric machine according to claim 3, characterized in that the concentric slits in the inside diameter of the core sheets of the rotor is made in the leaves end packet core.



 

Same patents:

FIELD: electrical engineering.

SUBSTANCE: axial electric motor is designed to be stationary and open in a plot of land, the body consisting of the lower tier including a foundation slab with the lower support assembly and the upper tier including a star-shaped spherical framework attached to the foundation, the framework symmetrically composed of prop beams tensioned in the centre with an axial support and balancing assembly. Installed between the lower support assembly and the axial support and balancing assembly is a large diameter runner wheel on the end face whereof the short-circuited rotor proper is installed separated from the magnetic conductor of the stator, erected on the foundation slab on a raised platform, with an air gap. The runner wheel shaft is connected to the load via a clutch.

EFFECT: ensuring large magnitude torques combined with design simplification.

3 dwg

FIELD: electricity.

SUBSTANCE: motor consists of body with stator with low and high speed windings mounted in slots, rotor fixed at motor shaft and box of inputs with through joints connected to outputs of specified windings. According to invention winding changeover device is located at motor body; input terminals of the motor should have facilities for connection of feeder current-carrying leads and output terminals of winding changeover device should be connected electrically with through joints connected to outputs of motor windings. Winding changeover device can be located in box of inputs; for this purpose two outputs of this device should be connected through its break-type contacts to outputs of low speed windings of the motor and two outputs through normally open contacts of device should be connected to through joints, which are connected to high speed windings of the motor. Third outputs of low and high speed windings should be interconnected and then connected to the third through joint in box of motor inputs.

EFFECT: simplification of power supply system structure, improvement of control and protection, enhancement of reliability and operation of asynchronous double-speed motors due to their power supply by one cable and due to motor control and protection by one device instead of two devices.

2 cl, 2 dwg

FIELD: electricity.

SUBSTANCE: rotor of an asynchronous electric machine comprises a shaft, a ferromagnetic core fixed coaxially on the shaft - a magnetic conductor with an external surface in the form of a circular cylinder and an electric winding of "squirrel cage" type. At the same time according to this invention, the ferromagnetic core - magnetic conductor consists of longitudinal elements made of material having at least axial electroconductivity, besides, the longitudinal elements with the help of frontal conductors - links are electrically connected to each other only by their end parts, forming a winding of "squirrel cage" type.

EFFECT: considerable improvement of weight and dimension characteristics of an electric machine, reduced prime cost of its manufacturing, considerable reduction of teeth pulsations of the torque on the shaft of the asynchronous electric machine with a rotor made according to this invention.

10 cl, 2 dwg

FIELD: engines and pumps.

SUBSTANCE: in asynchronous motor the following is used: semi-open (up to 2.2 mm) rotor slots of special design without chamfer with transition at the height of 1 mm to wide part of the slot top; stator slots having upper part of arched design and maximum opening up to 4 mm on condition that number of pairs of poles 2p = 6 - 12 is chosen so that frequency of supply voltage is not lower than 4 Hz, with rigid matching of ratio of numbers of rotor slots of 66-130 and stator slots of 54 - 108 at the number of rotor slots more than number of stator slots by 20%; stator winding with number of slots per pole and phase is at least 2; magnetic system made from steel having high values of induction without connection to value of specific losses.

EFFECT: higher energy data and overload capacity of electric motor, including at its operation in generator mode.

2 dwg, 1 tbl

FIELD: electricity.

SUBSTANCE: low-speed asynchronous electric motor includes stator with multi-phase winding and rotor with interleaved core and short-circuited winding. Stator phases are made in the form of annular windings coaxial with rotor, each of which is located between two annular magnetic cores with teeth protruding in axial direction and which are opposite directed. At that, annular magnetic cores of the phase are offset relative to each other through π/z angle, and between them there arranged is toroidal magnetic core, and annular magnetic core of various phases are offset relative to each other through 2π/z·m angle, where z - the number of teeth of each annular magnetic core, and m - the number of phases.

EFFECT: simplifying the manufacturing procedure of the stator windings at simultaneous technically possible increase of the number of poles of low-speed asynchronous electric motor.

3 dwg

FIELD: electricity.

SUBSTANCE: in the proposed electric motor containing stator (2) with single-phase winding (6) and rotor (13) with squirrel cage (24), stator (2) has magnetic core (3) and magnetic core (4), the symmetry axes of which are parallel to each other and perpendicular to rotor (13) rotation axis; poles (5) of magnetic core (3) lie in its symmetry axis, magnetic core (4) is ring-shaped and has one pair of poles (11) on inner side of the ring; angle between symmetry axis of each pole (11) and symmetry axis of magnetic core (4) lies within 15° to 75°; on poles (11) there arranged is winding (12) in the form of coil wound on spiral; on the part of magnetic core (4), which is opposite to poles (11), there is winding (9) representing the coil wound on spiral; windings (9) and (12) are connected to each other so that the direction of their coiling is the same; rotor (13) is located between poles (5) and (11).

EFFECT: simplifying the design, improving operating reliability of electric motor, and reducing its operating costs.

2 cl, 3 dwg

FIELD: electricity.

SUBSTANCE: asynchronous motor with hollow short-circuit rotor includes hollow rotor and external stator with core and winding, as well as additional rotor installed on the shaft in the zone restricted with stator with possibility of rotation irrespective of hollow rotor, made from ring-shaped magnet radially magnetised with the number of pairs of poles, which is equal to the number of pairs of poles of stator winding, on which there pressed is thin-wall sleeve from conducting material, and hollow rotor is made in the form of thin-wall shell from conducting material.

EFFECT: increasing power coefficient and efficiency of asynchronous motor with hollow rotor without deterioration of its dynamic characteristics.

3 cl, 2 dwg

FIELD: electricity.

SUBSTANCE: there is proposed rotor of asynchronous motor which includes magnetic conductor fixed on shaft and in slots of which there arranged is short-circuited winding made from cast metal. Cast metal of winding contains 98.80 - 99.95% of copper, as well as alloying elements and impurities in the form of plumbum, stannum, bismuth, antimony, nickel, zinc, cadmium, phosphorus and arsenic. In addition, lithium is added to cast metal of short-circuited winding.

EFFECT: increasing density, decreasing the influence of impurities and increasing conductivity of cast metal of short-circuited winding of rotor of asynchronous motor.

3 cl

FIELD: electricity.

SUBSTANCE: additional effect of rotating electromagnetic stator field on sectors of short-circuit rotor winding coils passing through areas adjoining stator pole half-pitch borders is added to effect of rotating electromagnetic stator field on short-circuit rotor winding coils passing through areas adjoining stator pole pith borders. Machine retains field rotation effect and continues full-scale operation with one phase disconnected, generating high-quality harmonic voltage of missing phase in disconnected phase winding.

EFFECT: starting current ratio reduced by motor due to prevention of braking losses, increased number of starts without load loss, possible application of the machine in most difficult operation environment with high shaft load.

6 cl, 4 dwg

FIELD: electric engineering.

SUBSTANCE: proposed short-circuited rotor with squirrel cage comprises shaft (1) and laminated core of sheet steel (2), in laminated core of sheet steel (2) there are rotor winding (3) rods located, which at both ends of laminated core of sheet steel (2) are pulled through openings (10) of each end plate (9) and closed by short-circuited ring (4), which, being electrically conducting, connects ends of rotor winding (3) rods on one side of short-circuited rotor to squirrel cage, besides each end plate (9) comprises circumferential ledge, which at least partially covers short-circuiting ring (4) with geometric closure at its outer side, besides each end plate (9) comprises part of rotor winding (3) rod and part of short-circuiting ring (4). At the same time, according to the present invention, end plates (9) are arranged as massive and are made of stronger material compared to rods of rotor winding (3) and short-circuiting rings (4), besides rods of rotor winding (3) have bulge at their ends with increased cross section of rod (7), moreover, at least part of rotor winding (3) rods bulge lies in openings (10) of end plates (9), besides transition between bulge and short-circuiting ring (4) is arranged in the form of rounding with transitional radius (8).

EFFECT: improved reliability of short-circuited rotor and asynchronous machine as a whole by elimination of possibility of breakage in transitional area of rotor winding rods and short-circuiting rings, provision of reliable retention of short-circuiting rings at high speeds of rotation and centrifugal forces.

9 cl, 13 dwg

FIELD: electricity.

SUBSTANCE: voltage control is carried out in particular due to mechanical displacement of parts of a rotor magnetic system relative to each other, control of which is carried out, for instance, along a feedback circuit, besides, the generator shaft is equipped with inner and outer bushings, freely moving relative to the shaft, at the same time the specified bushings are rigidly connected with one or several keys, and a part of the rotor magnetic system is rigidly connected with the outer bushing, while the second part of the rotor magnetic system is rigidly fixed on the shaft. Mutual displacement of magnetic system parts is carried out due to radial-reciprocal movement of bushings by means of axial action of an electromagnet connected with an inner bushing via a support-radial bearing.

EFFECT: provision of output voltage control from zero to maximum, with self-locking by output voltage removal, when a control signal is not available.

2 dwg

Electric spindle // 2479095

FIELD: electricity.

SUBSTANCE: electric spindle comprises a body, in the cavity of which there is a laminated stator core, equipped with semi-closed slots, in which there are winding coils placed, besides, in the cylindrical cavity of the stator there is a rotor installed as capable of rotation, and its bearing unit is arranged as capable of gas-dynamic support, at the same time the electric spindle is equipped with a clamp for fixation of a working tool. At the same time, according to this invention, conductors of the winding of each stator slot are fixed with a wedge and a key insert contacting with it from insulating material, the cross section of which is made as capable of fixation of the key insert back under the slot wedge, and the ledge section complies with the slot splint section, besides, the profile of the key insert ledge surface corresponds to the surface of the cylindrical cavity of the stator core, the surface of the key insert back along its entire length is equipped with a longitudinal chute, which is open into an inner cavity of the spindle body arranged as capable of supplying air into it, in the cavity of the electric spindle body there are cylindrical bushings placed, the diameter of the cavity of which is equal to the diameter of the cylindrical cavity of the stator core, and between the ends of the stator core and the ends of cylindrical bushings facing them there are support rings installed, the cavity of which exceeds the diameter of the cylindrical cavity of the stator core, equipped with a collar that covers a part of the outer surface of bushings, the specified thrust rings are made of non-magnet material and are fixed with the stator core, and the cylindrical bushings are installed as capable of radial displacement relative to the longitudinal axis of the cylindrical cavity of the stator core, for this purpose contacts of bushings with the body, the end shield and collars of thrust rings are equipped with sealing rings arranged as capable of elastic deformation radially and along the longitudinal axis of the stator core. The rotor is made with inner cavities, for this purpose it comprises coaxial hollow shaft and shell, which are rigidly connected to each other, at least by three links equidistant from each other and made in the form of plates of identical thickness, being aligned radially to the longitudinal axis of the rotor, the ends of the rotor are rigidly fixed to the end covers, for instance, by vacuum-diffusion welding, besides, one of end covers of the rotor is arranged as thickened and is equipped with a clamp for fixation of a working tool.

EFFECT: increased life of electric spindles, including those operating under higher and high frequencies of rotation, with simultaneous provision of minimum rotor sagging and improved cooling of both a rotor and a winding of an electric spindle stator.

3 cl, 2 dwg

FIELD: electricity.

SUBSTANCE: rotor for an electrodynamic machine, in particular, for a hydraulic generator, comprises a body, which is assembled from many segments (10) of sheet metal arranged in axial direction one after another, between segments (10) for creation of cooling channels there are location links (14), which are supported by bolts (12) to carry centrifugal forces acting on them, and the bolts stretch in axial direction through the body of the rotor of sheet metal. At the same time at least one part of the specified location links is assembled from many separate parts at least partially located above each other. Each assembled location link comprises an upper part and a lower part, at the same time one of both specified parts has an expanded first section with a hole for insertion of axial bolts of the body from sheet metal, and also two narrow second sections in the form of radial fingers, which are arranged at the distance from each other, and another one from both specified parts is made in the form of a disc with a hole, at the same time the specified disc with a hole and the specified first section with the hole arranged in it are arranged above each other.

EFFECT: provision of simple facilities of protection for specified location links against hazardous impact of centrifugal forces in process of electric machine operation.

13 cl, 9 dwg

FIELD: electricity.

SUBSTANCE: rotor for an electrodynamic machine, in particular, for a hydraulic generator, comprises a body, which is assembled from many segments (10) of sheet metal arranged in axial direction one after another, between segments (10) for creation of cooling channels there are location links (14), which are supported by bolts (12) to carry centrifugal forces acting on them, and the bolts stretch in axial direction through the body of the rotor of sheet metal. At the same time at least one part of the specified location links is assembled from many separate parts at least partially located above each other. Each assembled location link comprises an upper part and a lower part, at the same time one of both specified parts has an expanded first section with a hole for insertion of axial bolts of the body from sheet metal, and also two narrow second sections in the form of radial fingers, which are arranged at the distance from each other, and another one from both specified parts is made in the form of a disc with a hole, at the same time the specified disc with a hole and the specified first section with the hole arranged in it are arranged above each other.

EFFECT: provision of simple facilities of protection for specified location links against hazardous impact of centrifugal forces in process of electric machine operation.

13 cl, 9 dwg

FIELD: electricity.

SUBSTANCE: linear electric machine, the stator of which consists of two longitudinal round bars (1) with armature winding and transverse bar (2) with excitation winding. According to the invention, runner is made in the form of two cylinders (3) with round holes (4), which are connected by means of jumper bar (5), axes of holes (4) are offset relative to axes of cylinders (3) to the runner periphery.

EFFECT: providing the possibility of interaction of all sections of armature winding with working magnetic flux; increasing use efficiency of armature winding and reducing the consumption of winding conductor.

12 cl, 1 dwg

FIELD: electricity.

SUBSTANCE: invention refers to design of contactless magnetoelectric machines with electromagnetic reduction, and can be used in direct drives, in automation systems, in mechanisms with high moments on the shaft and low rotation frequencies of the shaft, as well as high-frequency electric generators and synchronous frequency converters. The proposed reduction magnetoelectric machine with pole gear-type inductor includes stator, the armature core of which is charged and has salient poles, on inner surface of which elementary teeth are made, coil m-phase armature winding, each coil of which is arranged on the corresponding salient pole of the armature, one on each pole, and rotor containing an inductor with toothed poles with equal number of elementary teeth on each pole, which are symmetrically distributed along cylindrical surface; constant magnets magnetised in tangential direction are located between toothed poles of the inductor. When performing certain relations between the number of salient poles of the armature, number of elementary teeth on salient pole of the armature, number of salient armature poles in the phase, total number of armature teeth, number of toothed poles of the inductor, total number of inductor teeth, number of elementary teeth on toothed pole of the inductor and number of phases of m-phase armature winding of reduction magnetoelectric machine with pole toothed inductor, the method is implemented.

EFFECT: providing high power and operating characteristics, high specific torque moment on the shaft and high electromagnetic reduction of rotation frequency in electric motor mode, as well as high specific power at high EMF frequencies in electric generator mode.

5 cl, 5 dwg

FIELD: electrical engineering.

SUBSTANCE: electric reducer machine with a polar gear inducer contains a stator (its armature core made laminated and having clearly express poles on the inner surface whereof elementary cogs are arranged), the armature m-phase coil winding and a rotor containing an inducer with clearly express gear poles, symmetrically distributed along the cylindrical surface, with coil excitation winding placed on the poles. Electrical connection between the inducer excitation winding and the voltage source is effected via brushes and contact rings of the brush contact unit. Subject to definite ratios between number of clearly express armature poles, number of elementary cogs on a clearly express armature pole, number of clearly express armature poles per phase, total number of armature cogs, number of the inducer gear poles, total number of the inducer cogs, number of elementary cogs per inducer gear pole and number of phases in the m-phase armature winding of the electric reducer machine with a polar gear inducer the technical effect is achieved.

EFFECT: provision for high power and operational indicators, high specific rotation torque on shaft and high electromagnetic reduction of rotation speed in electric motor mode, high specific power at high frequencies of EMF in electric generator mode.

7 cl, 5 dwg

Electric machine // 2477916

FIELD: electrical engineering.

SUBSTANCE: electric machine contains a sealed housing the cavity whereof accommodates a laminated stator core made of electrical steel; along the outer diameter, the laminated stator core relying on the electric machine housing; the stator core has open slots wherein winding coils are placed while the stator cylindrical cavity accommodates the electric machine rotor installed so that to enable rotation. According to this invention, the laminated stator core has radial inter-pack ventilation channels, the aerodynamically communicating housing longitudinal channels with inlet holes, communicating with environments via a filter; the conductors of each stator slot winding are fixed with a wedge and a spline insert contacting it, the said insert cross section designed so that to enable fixation of the spline insert back under the slot wedge while the projection cross section matches that of the slot; the spline insert back surface, along the whole of its length, has a longitudinal groove communicating with the stator core inter-pack ventilation channels; the spline inserts volumes projecting above the stator core cavity surface are joined to form a tubular sleeve, preferably - composed of segments, with a cylindrical-shaped inner surface formation; installed inside the housing cavity, coaxial to the stator core cavity, are cylindrical sleeves made of an insulation material such as glass-cloth-base laminate, the sleeves butt-ends attached to those of the stator utmost packs; additionally, the rotor contains an inducer with a cylindrical external surface consisting of poles, permanent magnets, non-magnetic wedges and a shaft; the rotor length exceeds that of the inducer; rigidly attached to the inducer butt-ends are end cylindrical sleeves made of a non-magnetic material, installed flush relative to the inducer external surface and placed inside the stator cylindrical sleeves cavities representing journals of radial gasodynamic petal bearings.

EFFECT: reduction of weight and overall dimensions, increase of life margin of electric machines, in particular - those operating at higher and high rotation rates, combined with ensuring the rotor bow minimisation, improvement of the stator winding cooling and extension of the rotor stability region due to deformation of the said radial gasodynamic petal bearings and prevention of the rotor jams at high circular velocities within the gasodynamic petal bearings positioning area.

3 cl, 2 dwg

Electric machine // 2477916

FIELD: electrical engineering.

SUBSTANCE: electric machine contains a sealed housing the cavity whereof accommodates a laminated stator core made of electrical steel; along the outer diameter, the laminated stator core relying on the electric machine housing; the stator core has open slots wherein winding coils are placed while the stator cylindrical cavity accommodates the electric machine rotor installed so that to enable rotation. According to this invention, the laminated stator core has radial inter-pack ventilation channels, the aerodynamically communicating housing longitudinal channels with inlet holes, communicating with environments via a filter; the conductors of each stator slot winding are fixed with a wedge and a spline insert contacting it, the said insert cross section designed so that to enable fixation of the spline insert back under the slot wedge while the projection cross section matches that of the slot; the spline insert back surface, along the whole of its length, has a longitudinal groove communicating with the stator core inter-pack ventilation channels; the spline inserts volumes projecting above the stator core cavity surface are joined to form a tubular sleeve, preferably - composed of segments, with a cylindrical-shaped inner surface formation; installed inside the housing cavity, coaxial to the stator core cavity, are cylindrical sleeves made of an insulation material such as glass-cloth-base laminate, the sleeves butt-ends attached to those of the stator utmost packs; additionally, the rotor contains an inducer with a cylindrical external surface consisting of poles, permanent magnets, non-magnetic wedges and a shaft; the rotor length exceeds that of the inducer; rigidly attached to the inducer butt-ends are end cylindrical sleeves made of a non-magnetic material, installed flush relative to the inducer external surface and placed inside the stator cylindrical sleeves cavities representing journals of radial gasodynamic petal bearings.

EFFECT: reduction of weight and overall dimensions, increase of life margin of electric machines, in particular - those operating at higher and high rotation rates, combined with ensuring the rotor bow minimisation, improvement of the stator winding cooling and extension of the rotor stability region due to deformation of the said radial gasodynamic petal bearings and prevention of the rotor jams at high circular velocities within the gasodynamic petal bearings positioning area.

3 cl, 2 dwg

FIELD: electrical engineering.

SUBSTANCE: axial electric motor is designed to be stationary and open in a plot of land, the body consisting of the lower tier including a foundation slab with the lower support assembly and the upper tier including a star-shaped spherical framework attached to the foundation, the framework symmetrically composed of prop beams tensioned in the centre with an axial support and balancing assembly. Installed between the lower support assembly and the axial support and balancing assembly is a large diameter runner wheel on the end face whereof the short-circuited rotor proper is installed separated from the magnetic conductor of the stator, erected on the foundation slab on a raised platform, with an air gap. The runner wheel shaft is connected to the load via a clutch.

EFFECT: ensuring large magnitude torques combined with design simplification.

3 dwg

FIELD: electrical engineering; mechanical design of commutatorless magnetoelectric machines.

SUBSTANCE: rotor magnetic system has more than two magnetically permeable steel laminations with pole horns formed by prismatic tangentially magnetized N-S permanent magnets placed inside laminated stack; inner and outer diameters of laminations are uninterrupted and rectangular prismatic magnets are installed inside them so that distance over outer arc between external planes of two adjacent magnets of unlike-polarity poles is shorter than that over internal arc between same planes; magnets do not contact one another and have at least one projection on inner diameter for coupling with rotor shaft.

EFFECT: enhanced manufacturability.

3 cl, 2 dwg

Up!