Low-speed asynchronous electric motor |
|
IPC classes for russian patent Low-speed asynchronous electric motor (RU 2412518):
   
 Repulsion commutator-free electric motor / 2412517
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).
 Asynchronous motor with hollow rotor with outside excitation / 2396672
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.
Rotor of asynchronous motor / 2395151
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.
 Method of operation efficiency improvement for asynchronous short-circuit electric machine, and asynchronous short-circuit electric machine (versions) / 2393613
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.
 Short-circuited rotor with squirrel cage of asynchronous machine / 2386201
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).
Asynchronous machine / 2349015
Invention relates to electrical engineering and may be used in other engineering branches, for example wind-power engineering. The main point of the invention is the use of specific common rotor in asynchronous machine with two stators and common rotor. The above-mentioned common rotor rotates freely with regard to the shaft and at the same time has two separate short-circuited windings for each stator and one common short-circuited winding for both stators. One stator is fixed to the shaft, while the other rotates together with it. The windings of the fixed stator and the stator rotating together with shaft are made up from windings of two or more unequal sections of the above stators. In addition, the minor sector of the fixed stator winding and the minor winding sector of the stator rotating together with the shaft are connected to the mains. The same connection is ensured for large sectors or next by the size sections of the fixed stator or stator rotating together with stator shaft.
 Rotor of frontal electric machine / 2321139
The rotor includes magnetic conductor with a yoke, a short-circuited winding, ventilation blades, short-circuiting ring, rods, ribs and stator. In accordance to the invention, ventilation blades are made current-conductive in form of several current-conductive, vertically mounted rods, connected to one short-circuiting ring of magnetic conductor, while upper part of current conductive ventilation blades is wedge-shaped, narrowing towards the working air gap and having cross-section area which is equal to or greater than the area of cross-section of current-conductive rod of magnetic conductor. Ventilating current-conductive blades may be installed according to two variants: in the first variant - vertically along internal and external diameters of short-circuiting ring of magnetic conductor, and in the second variant - vertically only along the internal diameter of short-circuiting ring of magnetic conductor, or only along external diameter of short-circuiting ring of magnetic conductor with possible passage of electric current through vertically mounted current-conductive rods of aforementioned blades along their whole height. The short-circuiting ring is installed on the side which is opposite to working air gap and positioned along the internal diameter of magnetic conductor, and ribs of ventilating current-conductive blades are installed on one short-circuiting ring.
 Face electric machine / 2321136
The face electric machine includes circular magnetic conductors, stator with excitation winding, rotor shaft with short-circuited winding, bearing shield with roller bearings, springs and adjusting device. In accordance to the invention, one of springs is the main spring and is made with diameter which exceeds rotor shaft diameter, and is mounted on the rotor shaft between roller bearings to ensure possible free movement of shaft inside the main spring, while on one end the spring abuts against the body of one roller bearing, and by other end it abuts against the body of another roller bearing with possible movement of rotor shaft along its axis, and additional spring is installed between roller bearing and the rotor, while by one end it abuts against the body of a roller bearing, and by other end it abuts against the body of rotor.
 Asynchronous two-frequency generator / 2313886
Asynchronous two-frequency electric machine contains short-circuited rotor and two three-phased windings combined in common core of stator with numbers of pole pairs p1 and p2, where EMF are induced at frequency f1 and f2 respectively, having clamps for connecting external electric circuits, including electric receivers, while in parallel to winding with number of pole pairs p2 a three-phased excitation capacitor is connected, also contains a motor as supply of mechanical power which rotates shaft of machine, and additional three-phased excitation capacitor, connected in parallel to winding with a number of pole pairs p1.
 Asynchronous electric motor rotor / 2309516
Shorted rotor of asynchronous electric motor contains a core with grooves, shorted winding with working and launching cells, where launching cell is made in form of inserted conductors of material with lesser specific electric conductance compared to working cell and shorting rings. In accordance to the invention, launching cell is made only of aforementioned inserted conductors and its length does not exceed the length of rotor magnetic wire, and working cell in each groove of magnetic wire of rotor only has one-sided contact with launching cell along whole length of inserted conductor, where working cell and shorting rings are cast copper, and inserted conductors of launching cell along their length are made in form of parts made of materials with varying specific electric conductance.
 Two-phase induction welding generator / 2404032
Proposed invention can be used in hand-held electric arc welding devices. Induction welding generator has two-winding stator. Three-phase excitation winding 2 has terminals for excitation capacitors 3 to be connected thereto. Working winding 4 is a two-phase winding. Circuit of said winding each phase 4, 5, shifted through 90 degrees, incorporates compound capacitor 6, 7 and single-phase bridge rectifier 8, 9 shunted by shunting capacitors 10, 11. Output terminals of rectifiers 8, 9 are connected in parallel and welding electrode 12 is connected thereto.
Short-circuited rotor with squirrel cage of asynchronous machine / 2386201
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).
 Double-winding stator with m=3-phase 2p1=6·k- and 2p2=8·k-pole lap windings in z=144·k slots / 2355097
Present invention pertains to electric machine engineering. The invention seeks to simplify manufacturing and increase use of active materials, while reducing input of insulating materials and coefficient of differential scattering σd% m=3-phase 2p1=6·k- and 2p2=8·k- pole lap windings of a stator in z=144·k slots. The essence of the invention lies in that, the double-winding stator of an asynchronous motor has m=3-phase 2p1=6·k- and 2p2=8·k-pole lap windings in z=144·k slots, each of which is made symmetrical from m=6-zone from equally spaced coils, put into the slots in two layers. According to this invention: from K=z coils with numbers from 1K to (z)K, the 2p1 pole winding relates to K/2 coils with odd numbers 1K, 3K,…(z-1)K, containing wK1 turns and connected into 6p1 coil semi-groups with q'1=4 neighbouring coils in each. The 2p2 pole winding relates to K/2 coils with even numbers 2K, 4K,…,(z)K, containing wk2 turns and connected into 6p2 coil semi-groups with q'2=3 neighbouring coils in each. All coils have uneven spacing in the slots, equal to yk=19, or yk=21, where k=1, 2 given q'1=z/12p1 and q'2=z/12p2.
 Double-winding stator with m=3-phase 2p1=12·k- and 2p2=14·k-pole lap windings in z=126·k slots / 2355096
Present invention relates to electric machine engineering. The invention seeks to simplify manufacturing and increase use of active materials, while reducing input of insulating materials and coefficient of differential scattering σd% m=3 phase p1=12·k and 2p2=14·k - pole lap windings in z=126·k slots. The essence of the invention lies in that, for the double winding stator of an asynchronous motor with m=3 phase 2p1=12·k- and 2p2=14·k- pole lap windings in z=126·k slots, each of which is made symmetrical with an m=6-zone from equally spaced coils, put into slots in two layers: from K=z coils with numbers from 1K to (z)K, the 2p1 pole winding relates to K/2 coils with even numbers 1K, 3K,…, (z-1)K, containing wk1 turns and connected into 6p1 coil semi-groups, given q'1=7/4 and with grouping of their coils into a 2 2 2 1 row, which repeats nine times. The 2p2 pole winding relates to K/2 coils with even numbers 2K, 4K,…, (z)K, containing wk2 turns and connected, given q'2=3/2, into 6p2 alternating double- and single-coil semi-groups. The spacing of all coils in the slots equals yk=9, where k=1, 2 when q'1=z/12p1 and q'2=z/12p2.
 Double-winding stator with c m=3-phase 2p1=8·k- and 2p2=10·k-pole lap windings in z=144·k slots / 2355095
Present invention pertains to electric machine engineering. The invention seeks to simplify manufacturing and increase use of active materials, while reducing input of insulating materials and coefficient of differential scattering σd% m=3-phase 2p1=8·k and 2p2=10·k - pole lap windings in z=144·k slots. The essence of the invention lies in that, for the double winding stator of an asynchronous motor with m=3 phase 2p1=8·k and 2p2=10·k-pole lap windings in z=144·k slots, each of which is made symmetrical with an m=6-zone from equally spaced coils, put into slots in two layers: from K=z coils with numbers from 1K to (z)K, the 2p1 pole winding relates to K/2 coils with odd numbers 1K, 3K,…, (z-1)K, containing wk1 turns and connected into 6p1 coil semi-groups with q'1=3 neighbouring coils in each. The 2p2 pole winding relates to K/2 coils with even numbers 2K, 4K,…,(z)K, containing wk2 turns and connected into 6p2 coil semi-groups given q'2=12/5, with grouping their coils in a 3 2 3 2 2 row, which repeats six times. The spacing of all coils in the slots equals yk=15, where k=1, 2 when q'1=z/12p1 and q'2=z/12p2.
 Double-winding stator with m=3-phase 2p1=6·k- and 2p2=8·k-pole lap windings in z=72·k slots / 2355094
Present invention relates to electric machine engineering. The invention seeks to simplify manufacture and increase use of active materials while reducing input of insulating materials and lowering coefficient of differential scattering σd% m=3-phase 2p1=6·k- and 2p2=8·k-pole lap windings of a stator with z=72·k slots. The essence of the invention lies in that, the double-winding stator of an asynchronous motor has m=3-phase 2p1=6·k- and 2p2=8·k-pole lap windings in z=72·k slots, each of which is made from m=6-zone from equally spaced coils, put into the slots in two layers. According to this invention: from K=z coils with numbers from 1K to (z)K, the 2p1 pole winding relates to K/2 coils with odd numbers 1K, 3K,…(z-1)K, containing wk1 turns and connected into 6p1 coil semi-groups with q'1=2 neighbouring coils in each. The 2p2 pole winding relates to K/2 coils with even numbers 2K, 4K,…,(z)K, containing wk2 turns and connected, given q'2=3/2, to 6p2 into alternating double- and single-coil semi-groups. All coils have spacing in the slots, equal to yk=9, where k=1, 2, 3; q'1=z/12p1 and q'2=z/12p2.
 Double winding stator with m=3-phase 2p1=8·k- and 2р2=10·k-polar lap windings in z=96·k slots / 2355093
Present invention pertains to electric machine engineering. The invention seeks to simplify manufacturing and increase use of active material while reducing use of insulating materials and values of coefficient of differential scattering σd% m=3-phase 2p1=8·k and 2p2=10·k-polar lap windings of a stator with z=96-k slots. The essence of the invention lies in that, the double-winding stator of an asynchronous motor has m=3-phase 2p1=8·k- and 2p2=10·k- pole lap windings in z=96·k slots, each of which is made symmetrically from m'=6-zone from equally spaced coils, put into the slots in two layers. According to this invention: from K=z coils with numbers from 1K to (z)K, the 2p1 pole winding relates to K/2 coils with odd numbers 1K, 3K,…(z-1)K, containing wk1 turns and connected into 6p1 coil semi-groups with q'1=2 neighbouring coils in each. The 2p2 pole winding relates to K/2 coils with even numbers 2K, 4K,…,(z)K, containing wk2 turns and connected, given q'2=8/5, with grouping their coils in a 22121row, which repeats six times. The spacing of all coils in the slots equals yk=9, where k=1, 2 when q'1=z/12p1 and q'2=z/12p2.
 Electromechanical core drilling assembly / 2337225
Assembly contains power supply source with control system, submersible asynchronous three-phase electric motor, rotor of which is connected to core tube with crown, stator connected with top tube, and elastic element that is rigidly fixed with cable lock on one side and electric motor rotor on the other. Source of windings power supply is equipped with single-phase bridge rectifier, rotor of submersible asynchronous three-phase electric motor is made with one pair of explicit poles, and one phase stator winding is serially connected with bridge single-phase rectifier, to the outlet of which by direct current two other phase windings are connected by serially connected between each other ends, which form one pair of poles, with the possibility of rotor fixation with stator by elastic element in initial position, at which longitudinal axis of rotor symmetry coincides with longitudinal axis of symmetry of electromagnet field formed by two serially connected stator windings.
Asynchronous two-frequency generator / 2313886
Asynchronous two-frequency electric machine contains short-circuited rotor and two three-phased windings combined in common core of stator with numbers of pole pairs p1 and p2, where EMF are induced at frequency f1 and f2 respectively, having clamps for connecting external electric circuits, including electric receivers, while in parallel to winding with number of pole pairs p2 a three-phased excitation capacitor is connected, also contains a motor as supply of mechanical power which rotates shaft of machine, and additional three-phased excitation capacitor, connected in parallel to winding with a number of pole pairs p1.
 Motor-brake / 2287889
Stator and rotor contacting surfaces of motor-brake built around squirrel-cage induction motor are provided with taper thread; rotor shaft is supported on one end by radial bearing and on other one, by thrust bearing with spacer disk affording cohesion between stator and rotor threaded surfaces during reverse movement of rotor; shaft extension of the latter is splined.
Motor-brake / 2287889
Stator and rotor contacting surfaces of motor-brake built around squirrel-cage induction motor are provided with taper thread; rotor shaft is supported on one end by radial bearing and on other one, by thrust bearing with spacer disk affording cohesion between stator and rotor threaded surfaces during reverse movement of rotor; shaft extension of the latter is splined.
|
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
The invention relates to electrical engineering, in particular to electrical machines and drives. Analog is, for example, an asynchronous motor (Design of electrical machines, Ed. by Kopylov I.P., book 1. M., "Energoatomizdat", 1993, s, RES)having a stator consisting of a laminated magnetic circuit with the winding, and the rotor squirrel cage winding. Closest to the proposed low-speed asynchronous motor asynchronous motor (Briskin DE, Zarkovic AU, Tails VS Electrical machines, part 1. M., "Higher school", 1987, s, 4.3), having a laminated magnetic core of the stator grooves, passing in the axial direction, which are the conductors of the stator winding, and a rotor comprising a laminated core and the short-circuited winding. This performance of the induction motor is traditional. When applying for a polyphase stator winding (usually three - phase) AC voltage stator creates a rotating magnetic field. During the rotation of the magnetic field relative to the rotor in the rotor winding is induced electromotive force, which creates a closed-loop rotor winding current. The current coil of the rotor interacts with the magnetic field of the stator, resulting electromagnetic torque, torque rotor. For some e is troprivoda required low-speed asynchronous motors, the use of which allows to exclude mechanical gearbox. To reduce the frequency of rotation of the magnetic field and the rotor of an induction motor increases the number of pairs of poles of the magnetic field created by the stator winding. When increasing the number of pairs of poles of the induction motor traditional performance it is necessary to increase the number of longitudinal grooves in the laminated magnetic core of the stator, in which is placed the stator winding. With the increase in the number of pairs of poles and slots increases the complexity and cost of manufacturing machines (Design of electrical machines, Ed. by Kopylov I.P., book 1. M., "Energoatomizdat", 1993, s). In addition, the number of grooves and teeth are limited to the minimum allowable width of teeth of the magnetic circuit of the stator, providing mechanical strength. The present invention will create a low-speed asynchronous electric motor with a large number of pairs of poles of the magnetic field, the complexity and cost of manufacturing which is much lower than the prototype. This is achieved by the fact that in low-speed asynchronous motor contains a stator with a multiphase winding and a rotor with laminated magnetic circuit and a short-circuited winding, each phase of the stator is made in the form of an annular winding coaxially with the rotor located between the two annular magnet the wires. The annular magnetic circuit of each phase have teeth, protruding in the axial direction and directed counter, including z on each annular magnetic core is equal to the number of motor poles R. Annular magnetic circuit, which is placed between any of the phases of the motor, shifted relative to each other by the angle π/z, and the annular magnetic circuits of different phases are shifted relative to each other by the angle 2π/z·m, where z - number of teeth of each of the annular magnetic circuit, and m is the number of phases. Between the annular magnetic circuits of the same phase are placed toroidal magnetic core. The inventive design of the low-speed induction motor allows to simplify the technology of the winding of the stator and at the same time technically possible to increase the number of motor pole pairs. The complexity and cost of manufacture of such an induction motor is much lower than that of the motor arranged in the slots of the magnetic circuit of the stator winding. Moreover, with the increase in the number of motor pole pairs of the advantages of the proposed asynchronous motor become more apparent. Figure 1 shows an axial section of the low-speed asynchronous motor three-phase versions. Figure 2 - elements of the magnetic circuit of one phase of the stator. Figure 3, 4 and 5 are axial sections of the engine. In depicted in figure 1 three-phase,low-speed, asynchronous motor in the housing 1 is placed in the stator, the phase of which is made in the form of an annular windings 2, 3 and 4 arranged coaxially with the rotor. Phase 2 is located between the annular magnetic circuits 5 and 6, phase 3 - between the annular magnetic cores 7 and 8, and phase 4 - between the annular magnetic circuits 9 and 10. Each of the annular magnetic circuit has 5-10 protruding in the axial direction of the teeth. The magnetic core 5 has teeth 11, the magnetic core 6 - teeth 12, the magnetic core 7 - teeth 13, the magnetic core 8 - teeth 14, the magnetic core 9 - teeth 15, the magnetic core 10 - teeth 16. The teeth 11 and 12 (13 and 14; 15 and 16) ring cores 5 and 6 (7 and 8; 9 and 10), between which is located the annular phase 2 (3; 4), are directed oppositely, and the annular magnetic circuits 5 and 6 (7 and 8; 9 and 10) are deployed relative to each other by an angle angle π/z. The annular magnetic 5-10 can be made of soft magnetic composite material (MMC) or teams of several elements, made of electrical steel sheet. Between the annular magnetic circuits 5 and 6; 7 and 8; 9 and 10 are toroidal magnetic cores 17, which also can be made of MMK or rolled from sheet steel. Figure 2 shows the location of the elements of the magnetic circuit of the phase 2 of the stator during Assembly. As already noted, the annular magnetic circuits 5 and 6 are expanded relative to each other at the Lu at the angle π/z. The direction of the Assembly shown by arrows. When assembling the elements, the teeth of the ring 11 of the magnetic circuit 5 is fixed in the grooves between the teeth of the ring 12 of the magnetic circuit 6, and the teeth 12 of the ring magnet 6 is fixed in the grooves between the teeth of the ring 11 of the magnetic circuit 5. Phase 2 is located in the cavity formed by the annular magnetic circuits 5 and 6 and toroidal magnetic core 17. Similarly gather the elements of the magnetic circuit of phases 3 and 4. When installed in the housing 1 of the pair of annular magnetic cores 5 and 6; 7 and 8; 9 and 10 phases 2, 3 and 4 must be deployed relative to each other by the angle 2π/z·m, where m is the number of phases equal in the structure 3. Figure 3, 4 and 5 shows a diametrical section of the engine, made in the areas of location of each of the three phases, which shows the offset angle of the teeth 11 and 12; 13 and 14; 15 and 16 pairs of annular magnetic cores 5 and 6; 7 and 8; 9 and 10. On the shaft 18 of the rotor pack installed laminated magnetic circuit 19, the plates of which are located in the median plane. In the grooves of the laminated magnetic circuit 19 are rods 20 short-circuited windings, which are closed on the ends of the laminated magnetic circuit 19 rings 21. The electric motor operates as follows. In phase 2, 3 and 4 of the electric motor is supplied standard three-phase sinusoidal voltage, which fasn the e voltage have the same amplitude, the frequency and shifted in time by one third period. The first phase 2 creates a pulsating magnetic flux, which passes radially through the annular magnetic core 5, the teeth 11 of annular magnetic core 5, the air gap between the teeth 11 and the laminated magnetic core 19 of the rotor through the magnetic circuit 19 in the tangential direction, then through the gap between the magnetic core 19 and the teeth 12 of annular magnetic circuit 6 through the annular magnetic core 6 in the axial direction through a toroidal magnetic core 17 from the magnetic core 6 to the magnetic circuit 5. The teeth 11 of the magnetic circuit 5 and the teeth 12 of the magnetic circuit 6 are poles of the pulsating magnetic field generated by the first phase 2 of the stator, the teeth 11 and 12 are displaced in the tangential direction by an angle equal to π/z, where z - number of teeth of each of the annular cores 2-7. Thus, phase 2 creates a pulsating magnetic field, the number of pairs of poles is equal to the number of teeth z of the annular magnetic circuits 5 and 6. Similar pulsating magnetic field creates a second phase 3. But since the annular magnetic phases are expanded relative to each other by 2π/z·m, then the poles of the magnetic field of the second phase 3 are offset from the poles of the first phase by the angle 2π/3z. The third phase 4 also creates a similar pulsating magnetic field, the poles of which is shifted considers the flax poles of the first phase, respectively, at an angle 4π/3z. Thus, the pulsating magnetic field generated by the phase shifted relative to each other by 2π/3 e. radians. Each pulsating magnetic field is produced in the rods 20 squirrel-cage winding of the rotor EMF. The total EMF in the rod 20 squirrel-cage winding of the proposed engine will be similar to the EMF generated by a rotating magnetic field in the asynchronous motors of conventional designs. Under the action of the total EMF in the rod 20 is short-circuited rotor winding currents arise in the interaction with magnetic fields created by phases 2, 3 and 4 of the stator, you receive the electromagnetic torque, torque rotor. In the proposed asynchronous motor the number of teeth of the annular magnetic circuit determines the number of pairs of poles of the magnetic field, and each phase is designed as a compact annular winding. As in the grooves between the teeth of the ring cores are not the coils of the stator winding used to meet the proposed engine with a large number of pairs of poles and a low frequency of rotation of the rotor is much easier and cheaper than in the prototype. We offer electric machine can also be used in asynchronous generator. Low-speed asynchronous motor contains a stator with a multiphase winding and a rotor with a laminated magnetic core is m and the short-circuited winding, characterized in that the phase of the stator is made in the form of an annular windings coaxially with the rotor, each of which is located between two annular cores with teeth protruding in the axial direction and facing the counter, and the annular magnetic phase shifted relative to each other by the angle π/z, and between them is placed a toroidal magnetic core, and an annular magnetic circuits of different phases are shifted relative to each other by the angle 2π/z·m, where z - number of teeth of each of the annular magnetic circuit, and m is the number of phases.
|