3126results about "Windings conductor shape/form/construction" patented technology

The invention relates to a multi-source system comprising an electric machine (M), of the type comprising a rotor and a stator (1), the stator (1) comprising a plurality of windings (10, 11, 12) made of turns of insulated conductive material, each winding (10, 11, 12) comprising a plurality of independently powered coils (100, 101, 102), characterised in that the system also comprises a plurality of DC power sources and a plurality of power electronics converters associated with different coils (100, 101, 102) of the electric machine (M), each power source powering one or more power electronics converters and each power source being connected to at least one coil (100, 101, 102) of each winding (10, 11, 12) of the electric machine (M).

A method of cooling rotor winding end turns extending from a rotor core includes coupling a collar to a rotatable shaft of the rotor core. The collar has a first wall confronting the rotor core, a second wall spaced from and opposing the first wall, a third wall between the first and second walls defining a set of apertures therethrough, a first cavity cooperatively defined by the first, second and third walls, having a first opening opposing the third wall, a fourth wall circumscribing the third wall, a second cavity cooperatively defined by the second, third and fourth walls, the second cavity defining a second opening opposing the second wall. The first and second cavities are in fluid communication, and the rotor winding end turns are receivable into the second cavity. The method includes directing a coolant into the first cavity, and delivering the coolant to the second cavity.

The present disclosure provides a sealing device and an in-wheel motor including the sealing device. The in-wheel motor includes a stator, a rotor rotatably disposed with respect to the stator, an annular inner seal connected to the stator and spaced apart from the rotor by a predetermined gap so as to be disposed between the stator and the rotor, and an annular slinger coupled to an end portion of the rotor, wherein the annular inner seal seals between the slinger and the in-wheel motor.

A stator for an electric machine includes a stator core defining a slot extending in an axial direction from a first end to a second end, a wire disposed in the slot, a coolant pipe disposed in the slot and extending in the axial direction from the first end to the second end, the coolant pipe extending from a pipe inlet to a pipe outlet, and a thermally conductive potting material disposed in the slot between the coolant pipe, the wire, and the stator core.

The invention discloses a straight bar splicing type stator core for a frameless torque motor, and relates to the field of stator cores, the straight bar splicing type stator core comprises a stator core body, the initial state of the stator core body is a straight bar shape, stator core split bodies are arranged in a straight line, the inner side projection of the stator core body is provided with a stator core tooth part, and the inner side projection of the stator core body is provided with a stator core tooth part. Coils are sequentially wound on the tooth parts of the stator core, and after the coils are wound, the stator core body is subjected to integral circle surrounding welding. According to the straight bar splicing type stator iron core for the frameless torque motor, the stator iron core body adopts a straight bar type design, the split structures of the stator iron core body are arranged in a straight line, and the connection part of each split body is provided with a process hole which is specially used for eliminating internal stress generated in the manufacturing and operation processes, so that the production process is simplified, the production efficiency is improved, and the production cost is reduced. And the uniformity and the stability of the iron core are ensured, the stress concentration is effectively reduced, the production speed and the production efficiency are improved, meanwhile, the manual intervention requirement is reduced, and large-scale manufacturing is facilitated.

A self-excitation motor disclosed by the present invention comprises a rotor, a first end of the rotor is equipped with a rectification circuit, the rotor comprises a rotor iron core and a plurality of harmonic windings and excitation windings, the rotor iron core is provided with rotor teeth, and each harmonic winding and each excitation winding are respectively wound on the corresponding rotor teeth. Each harmonic winding comprises a first harmonic winding and a second harmonic winding, the winding directions of the first harmonic winding and the second harmonic winding are the same, star connection is adopted, one ends of the first harmonic winding and the second harmonic winding are connected in series in a one-to-one mode, and the other ends of the first harmonic winding and the second harmonic winding are jointly connected to form a star neutral point; the other end of each second harmonic winding is connected with the midpoint of each bridge arm in the rectifying circuit in a one-to-one manner; the winding directions of the excitation windings on every two adjacent rotor teeth are opposite, and the two ends of each excitation winding are electrically connected with the direct current output end of the rectification circuit. This induces and rectifies the current for excitation more efficiently. The invention further provides a motor control strategy based on high-frequency harmonic current phase optimization.

The invention discloses a ventilation cooling optimization method for an all-hydrogen-cooled gas turbine generator, and relates to the technical field of all-hydrogen-cooled generator cooling, and the method comprises the steps: analyzing cooling demands, calculating loss in combination with a high-frequency start-stop peak regulation working condition, and setting a stator RTD temperature, an iron core temperature and a temperature rise target; an end ventilation structure is designed, the diameter of the fan is optimized, and bar gaps, wind shield holes and inner supporting ring ventilation grooves are formed; optimizing variable air ducts of the iron core, and adjusting the width of the air ducts according to thermal load partitions; cFD coupling simulation verification is carried out, and a loss data simulation flow field and a temperature field are imported; carrying out physical test iterative optimization, manufacturing a prototype model, testing, and adjusting parameters until errors are qualified; operation monitoring and dynamic adjustment are carried out, and a sensor is installed to collect data in real time and adapt to working condition requirements. Cooling uniformity and efficiency are improved, peak regulation start and stop working conditions are adapted, hydrogen parameter change influences are balanced, vibration and cooling are cooperatively controlled, operation and maintenance convenience is improved through modular design, and long-term stable operation of the generator is guaranteed.

The invention discloses a stator and rotor punching sheet and magnetic steel for a concentrated winding type frameless torque motor, and belongs to the technical field of concentrated winding type motors, the stator and rotor punching sheet comprises a rotor punching sheet, a stator punching sheet and magnetic steel, and the center of the rotor punching sheet is provided with a rotor iron core; the stator punching sheet is composed of yoke parts and tooth parts, the tooth parts are trapezoidal teeth, the tooth parts and the stator grooves are distributed at equal angles, the tooth parts and the stator grooves are alternately arranged, and the stator grooves are straight grooves; the inner side of the stator punching sheet is also provided with a rotor punching sheet and magnetic steel, the rotor punching sheet and the magnetic steel form a motor rotor, and the motor rotor is a surface-mounted rotor. According to the stator and rotor punching sheet and the magnetic steel for the concentrated winding type frameless torque motor, the winding grooves of the stator iron core are flat-bottom straight grooves, the flat copper wires are wound in the winding grooves, the flat wire coils are fixed to the tooth portions through glue, integral potting is carried out after fixing is completed, and compared with a traditional pear-shaped groove for containing round wire windings, the stator and rotor punching sheet is simple and firm in structure, high in groove fullness rate, high in motor efficiency and improved in stability.

The invention discloses a variable magnetic flux memory motor, which comprises a stator, armature windings and a rotor, and is characterized in that the armature windings comprise a first winding and a second winding which are different and switchable in mode; the rotor comprises a plurality of poles distributed in the circumferential direction, each pole comprises a first layer of permanent magnets and a second layer of permanent magnets, the first layer of permanent magnets are high-coercive-force permanent magnets, the second layer of permanent magnets comprise at least two second permanent magnets, all the second permanent magnets are high-coercive-force permanent magnets or all the second permanent magnets are low-coercive-force permanent magnets, and the first layer of permanent magnets and the second layer of permanent magnets are arranged in the circumferential direction. And the characteristics of the magnetic materials of the second layer of permanent magnets of two adjacent poles are opposite, a fundamental wave main magnetic field is formed through the first winding in a magnetism increasing state so as to improve the permanent magnet torque, and the second winding is switched to excite a harmonic magnetic field in a magnetism weakening state so as to maintain torque output. According to the invention, through the collaborative design of the heteropole asymmetric permanent magnet layout and the dual-mode winding, the problems that the magnetic adjustment range of the existing variable flux memory motor is limited and the torque is suddenly reduced in a weak magnetic state are solved, and the efficient operation interval is obviously widened.

The utility model provides a commutation stator module and a magnetic drive conveying system. The commutation stator module comprises a pedestal; the stator body is fixed on the base; the commutation armature winding is arranged on the stator body, and the commutation armature winding comprises a first commutation winding extending along a first direction and a second commutation winding extending along a second direction; the limiting assembly is arranged on the base, the limiting assembly comprises a limiting piece and a driving piece, the driving piece drives the limiting piece to ascend and descend, so that the limiting piece is switched between a receding position and a guiding position, the rotor module enters and exits when the limiting piece is located at the receding position, and the rotor module enters and exits when the limiting piece is located at the guiding position. When the limiting piece is located at the guiding position, the rotor module is limited and guided; a receding space is formed between the stator body and the base, and the driving parts are arranged in the receding space. In this way, the conveying direction can be changed without occupying extra space, and the conveying efficiency is high.

Systems and methods for cooling an externally excited electric machine. An externally excited electric machine cooling system, in one example, includes rotor windings positioned radially outward from a rotor shaft and including a plurality of gaps between metal wire bundles. The externally excited electric machine cooling system further includes a cooling device positioned in the plurality of gaps and configured to directly cool the rotor windings.

A motor assembly including a rotor rotatable about a rotating shaft; a stator formed as a continuous body and including multiple teeth areas, multiple body areas disposed outside of the multiple teeth areas and having a first width in a cross section of the stator in a direction perpendicular to a rotational axis of the rotating shaft, with the plurality of teeth areas extending from the plurality of body areas in a direction toward the rotating shaft, and multiple connection areas connecting multiple body areas; and a coil wound around each of the multiple teeth areas, wherein each of the multiple connection areas has a bending point having a second width in the cross section of greater than or equal to 0.05 and less than or equal to 0.25 of the first width, and is in contact with another connection area with reference to the bending point.

The invention discloses a connecting structure of frameless torque motor flat wire windings, which belongs to the technical field of frameless torque motors, and comprises a stator consisting of a stator core and windings, the stator core comprises stator slots and tooth parts, each phase of winding consists of N sets of two groups of flat wire coils, the width of the flat wire coil is gradually increased from the inner diameter side of the stator to the outer diameter side of the stator, the current direction of the coil accords with regular circulation of positive and negative and positive, each set of coil connecting wire is formed by connecting in the same layer, and compared with a coil with the outer side and the inner side connected with a cross-layer wire, the end space can be reduced, and the end height can be reduced. Compared with a round wire winding, the connection structure of the frameless torque motor flat wire winding has the advantages that the slot fullness rate can be increased, the motor efficiency is high, the stability is improved, the space utilization in a stator slot can be greatly improved through a specific wire connection mode, the space waste in the slot is reduced, the windings are more compact, the overall consumables are less, and the connection and assembly are more convenient.

The present disclosure relates to a deflector for an electric machine, the electric machine comprising a stator, the stator comprising a stator body having an end face in the axial direction of the machine and at least one end winding (4) formed on the end face of the stator body, the fluid director comprises a first fluid director ring body (1), a second fluid director ring body (2) and an annular fluid director part (3) connected with the first fluid director ring body (1) and the second fluid director ring body (2), the fluid director is of a semi-closed structure and is used for at least partially surrounding an end winding (4), and the first fluid director ring body (1) is located on the radial outer side of the second fluid director ring body (2) and surrounds the second fluid director ring body (2). A plurality of flow guide holes (11) are distributed in the circumferential annular face of the first flow guide ring body (1), and at least one opening (31) is formed in the annular flow guide part (3). The disclosure also relates to an electric machine, an electric drive assembly system and a vehicle comprising such a deflector.

A motor according to an aspect of the present invention includes a rotor rotatable around a center axis and a stator located on one side of the rotor in an axial direction. The stator includes a plurality of magnetic poles facing an end surface of the rotor on the one side in the axial direction. The rotor includes a rotor body having an annular shape and including at least one magnet, a rotor frame including a plurality of arms extending in a radial direction, and a first cover fixed to the rotor frame. The at least one magnet has, at least in part or in whole, a magnetization direction in the axial direction. The plurality of arms are located on the other side of the rotor body in the axial direction. The first cover is configured to cover at least part of a surface of the at least one magnet, the surface facing the one side in the axial direction.

The invention belongs to the technical field of motors, and particularly relates to a motor which comprises a coil in a connecting layer, the coil is provided with at least two turns of conductors connected in series, each turn of conductor is provided with a first main body section and a connecting section connected in series, the first main body sections are parallel to the axial direction of the motor, and the connecting layer is provided with two adjacent first main body sections. The connecting sections, connected at the same end of the motor, of every two adjacent first main body sections are located in different connecting layers. The connecting sections, connected at the same end of the motor, of the first main body sections of the flexible circuit piece are arranged in different connecting layers, so that the mutual influence between the connecting sections connected with the adjacent first main body sections in the same layer is reduced, the width of the connecting sections can be increased, and the resistance of the connecting sections is reduced; conductor heating of the connection section of the flexible circuit member is reduced, and the service life of the motor is prolonged.

The invention discloses a connecting structure of frameless torque motor flat wire windings, which belongs to the technical field of frameless torque motors, and comprises a stator consisting of a stator core and windings, the stator core comprises stator slots and tooth parts, each phase of winding consists of N sets of three groups of flat wire coils, the width of the flat wire coil is gradually increased from the inner diameter side of the stator to the outer diameter side of the stator, the connecting line of the first group of coil and the second group of coil of each set of coil is formed by overturning from the inner side of the stator to the outer side of the stator, and the connecting line of the second group of coil and the third group of coil of each set of coil is formed by connecting on the same layer close to the inner side of the stator. Compared with a traditional pear-shaped groove for placing a round wire winding, the connection structure of the frameless torque motor flat wire winding has the advantages that the groove fullness rate can be increased, the motor efficiency is high, the stability is improved, the utilization rate of the space in a stator groove can be greatly improved through a specific connection mode, the waste of the space in the groove is reduced, the windings are more compact, the overall material consumption is less, and the connection and the assembly are more convenient.

A liquid cooling structure for a motor includes: a casing; an end plate provided at a cylinder end of the casing; a stator; a rotor; and a substantially cylindrical bulkhead extending along a direction of extension of an axis passing through a center of the stator from an inner surface of the end plate such that the bulkhead faces an inner peripheral surface of the casing with a gap therebetween to allow coolant to flow through the gap. The casing has a coolant inlet passing through the casing to guide externally supplied coolant to the gap, the stator includes a stator core having teeth protruding from the inner peripheral portion of the stator core, and coils wound around the respective teeth, and the bulkhead has nozzle hole portions passing therethrough to allow the coolant flowing in the gap to be ejected to an interior space defined by the bulkhead.

The invention discloses a wire connecting structure of a flat wire stator, and belongs to the technical field of energy-saving motors, the wire connecting structure comprises a stator core and a stator slot, a winding is arranged in the stator slot, the stator core and the winding form a stator, the stator is a concentrated winding type stator, the longitudinal section of the winding is of an octagonal structure, and the winding is arranged in the stator slot. And the left and right sides of the windings can be broken to reduce the number of used molds and reduce the winding difficulty of the windings, and one end of each of two outgoing lines of each group of windings is on the outer diameter side of the stator while the other end is on the inner diameter side of the stator. According to the wire connecting structure of the flat wire stator, the cross section of the winding is of an octagonal structure, folding can be carried out on the two sides, the number of molds can be reduced, the winding difficulty of the winding can be reduced, compared with a traditional winding with a rectangular cross section, the slot fullness rate can be increased by 4%-8%, the end space is small, the number of opened molds is reduced, the winding difficulty of the winding is reduced, the cost is reduced, and the slot fullness rate, the power density and the efficiency are high.

The aircraft dual-redundancy two-in-one direct-drive electric driving system comprises an outer rotor assembly, a stator assembly and a controller assembly, the outer rotor assembly is rotationally connected with the stator assembly, the stator assembly comprises a stator shell and windings, the number of the windings is two, and three-phase outgoing lines of each winding penetrate through corresponding through holes A respectively; a sealing plug ring is arranged between each winding and the corresponding through hole A. The controller assembly comprises a circuit board and a wiring board, the circuit board and the wiring board are fixed in the installation cavity, IGBT modules are arranged on the circuit board at intervals, and three-phase outgoing lines of each winding are connected with the corresponding IGBT modules. The inner ring of the wiring board is connected with the corresponding IGBT module, two power supply connectors are arranged outside the stator housing, and the outer side of the wiring board is connected with the corresponding power supply connectors. The direct-drive electric drive system is highly integrated, compact in structure, efficient in heat dissipation and reliable in sealing and has the real high-reliability dual-redundancy capacity.

The invention discloses an axial magnetic flux motor which comprises a rotor assembly and a cooling assembly. The cooling assembly is arranged between the two rotor discs of the rotor assembly in the axial direction; a cooling air channel penetrating in the radial direction is formed in the cooling assembly, rotor air channels penetrating in the radial direction are formed in the sides, facing the cooling assembly, of the two rotor discs, and the cooling air channel is correspondingly communicated with the rotor air channels arranged on the two sides in the axial direction to form two circulating air channels. And high-temperature airflow in the rotor air duct and cooling airflow in the cooling air duct realize continuous convection and circulating heat exchange through the circulating air duct. Through a double-air-path circulating cooling structure, the rotor assembly is subjected to air-cooling heat dissipation, heat generated in the operation process of the rotor assembly is efficiently taken away, the working temperature of the rotor assembly is reduced, the risk of permanent magnet demagnetization caused by high temperature can be restrained, the stability of the output torque of the motor and continuous improvement of the operation efficiency are ensured, and the service life of the motor is prolonged. And the problem of performance degradation caused by temperature rise is avoided, so that the working reliability of the axial magnetic flux motor is improved.

The invention discloses an efficient heat dissipation motor stator module and a manufacturing method thereof, and belongs to the technical field of motors. The problems that an existing motor is low in heat dissipation efficiency, high in winding temperature rise and the like are solved. The module comprises a copper winding, a plurality of high-thermal-conductivity ceramic sheets and an independent stator tooth. Comprising a copper winding and stator teeth, any two adjacent wire turns of the copper winding are separated through high-thermal-conductivity ceramic sheets, the stator teeth penetrate through inner holes of the copper winding, and a high-thermal-conductivity epoxy resin potting layer wraps the copper winding, the multiple high-thermal-conductivity ceramic sheets and the part, penetrating into the copper winding, of the stator teeth and is cured into a whole. The high-efficiency heat dissipation stator module provided by the invention can improve the problem of overlarge thermal resistance caused by an air gap and an insulating layer between a winding and an iron core in a traditional motor, constructs a high-efficiency heat conduction path from the winding to the iron core, and effectively improves the heat dissipation performance of the motor.

The invention discloses an axial skewed pole mixed excitation V-shaped Halbach permanent magnet flux switching motor, which comprises a first stator, a first rotor, a magnetic isolation disc, a second rotor, a second stator, an excitation winding and an armature winding which are sequentially and coaxially stacked by adopting a multi-section axial stacked structure, each of the first stator and the second stator comprises a double-U-pi type stator iron core module, a magnetic isolation sheet, a permanent magnet pair and a permanent magnet; the first rotor and the second rotor are respectively attached to the two sides of the magnetic isolation disc, the first stator and the second stator are respectively composed of six double-U-pi type stator core modules and six magnetic isolation sheets in an alternating mode, permanent magnet pairs are arranged in the double-U-pi type stator core modules, and permanent magnets are arranged on the outer sides of the double-U-pi type stator core modules; the excitation winding is wound on the double U-pi type stator iron core module in a crossing mode, and the armature winding is wound on the root portion of the double U-pi type stator iron core module. The permanent magnet synchronous motor has the advantages of high power density, high torque density, high stability, wide speed regulation range, low harmonic loss, high fault tolerance and high reliability.

The invention relates to the technical field of motor stator heat dissipation, and discloses a stator heat dissipation structure and a motor. The stator heat dissipation structure comprises a stator iron core, the stator iron core is provided with heat dissipation grooves and a plurality of stator teeth, the heat dissipation grooves are located in the outer wall face of the stator iron core, and tooth grooves are formed between the adjacent stator teeth; the stator winding comprises a plurality of coils, the coils are wound on the stator teeth, and every two adjacent coils are arranged in one tooth groove at intervals; and the heat dissipation pipes are positioned between the two adjacent coils and in the heat dissipation grooves. Therefore, the structure of the stator core does not need to be obviously changed, and the stator core and the stator winding can be cooled at the same time. The heat dissipation capability of the motor is effectively improved, and the power output specification and reliability of the motor are improved.

A power tool includes a working component configured with the maximum output rotational speed; an electric motor configured with the maximum rotational speed; a transmission assembly configured with a transmission ratio; a driver circuit including one or more drive switches; and a controller for outputting a control signal to control the one or more drive switches of the driver circuit. At least one drive switch in the driver circuit includes a wide bandgap semiconductor switch, and the ratio of the required maximum rotational speed of the electric motor to the maximum rotational speed of the electric motor is less than or equal to 0.9. The electric motor system of the power tool has good electrical performance.

The invention, which belongs to the technical field of the motor, discloses a two-in-one integrated electric drive assembly comprising a housing assembly, a motor controller and a motor stator assembly. The shell assembly comprises a motor shell, a motor front end cover and a motor rear end cover, wherein the motor front end cover and the motor rear end cover are connected to the two axial ends of the motor shell respectively. The motor controller comprises a motor controller shell arranged on the motor front end cover and the motor rear end cover, and a control unit and a controller three-phase copper bar which are respectively arranged in the motor controller shell; the motor stator assembly comprises a stator iron core installed in the motor shell, a stator winding arranged on the stator iron core and a motor three-phase line wiring terminal electrically connected with the stator winding. The motor shell and the motor controller shell are independently arranged, and the motor controller shell is installed on the motor shell. According to the invention, the motor controller and the motor shell are arranged independently, so that the disassembly and maintenance are convenient, and the assembly and maintenance difficulty is reduced.

The invention provides a compact high-voltage generator with excellent heat dissipation performance, belongs to the technical field of high-voltage generators, and solves the technical problems that an existing generator is complex in structure, poor in heat dissipation performance and the like. Comprising a water-cooled generator shell, a rear end cover piece is arranged at the rear end of the water-cooled generator shell, a linkage heat dissipation end assembly is arranged at the front end of the water-cooled generator shell, a stator assembly is arranged between the rear end cover piece and the linkage heat dissipation end assembly, and a rotor shaft is rotationally arranged in the stator assembly; a rotor shaft is arranged in the water-cooled generator shell, the two ends of the rotor shaft are rotationally arranged between the rear end cover piece and the linkage heat dissipation end assembly respectively, a plurality of rotor assemblies are arranged on the rotor shaft and distributed in the stator assembly, an electric control box is arranged above the water-cooled generator shell, and a mounting base is arranged below the water-cooled generator shell. The heat dissipation device is provided with a water-cooling main heat dissipation system and an air-cooling auxiliary heat dissipation system, and the heat dissipation effect is good; and deep integration and modular structure are realized, the size is obviously reduced, the operation is stable, and the maintenance cost is reduced.

Three-phase windings are wound, with a conductor, around twelve magnetic pole teeth arranged at equal angular intervals on an inner peripheral portion of a stator core configured to constitute a three-phase, twelve-pole stator. The winding of each phase comprises, at least at one location, a portion in which the conductor is drawn out from one of the slots to form a lead-out portion and is then returned to the same slot, and the conductor on both sides of the lead-out portion is fixed within the one slot by the conductor wound around one of the magnetic pole teeth forming the one slot after the lead-out portion has been formed.

The present invention relates to a stator (100; 100*) for an electric machine (200), comprising an annular stator body (1; 1*) and several stator windings (2) arranged on the stator body (1; 1*), wherein the stator body (1; 1*) comprises at least one annular segment (1.1) extending along a circular path (K) and at least one indentation segment (1.2) having a radially inward orientation relative to the circular path (K), and wherein the stator windings (2) are arranged on the at least one annular segment (1.1). The present invention further relates to an electric machine (200) comprising: a stator (100; 100*) according to the invention, and a rotor (201) rotatably arranged within the stator body (1; 1*) about a rotor axis of rotation (R).The present invention further relates to a machine-gear arrangement (300) comprising: an electric machine (200) according to the invention, a first gear (301) arranged to rotate with the rotor (201), a second gear (302) arranged to engage with the first gear (301), and an element (303) which is non-rotatably connected to the second gear (302), wherein the element (303) is arranged at least partially in a region (B) between a recessed segment (1.2) and the circular path (K).

The invention discloses a transverse magnetic flux linear motor adopting a Y-shaped iron core and a Halbach array, belongs to the field of permanent magnet linear motor design, and aims at solving the problems that a traditional transverse magnetic flux linear motor is low in permanent magnet utilization rate, large in magnetic leakage and insufficient in power density. The device comprises a primary part and a secondary part, the primary part comprises stator iron cores which are sequentially arranged in the axial direction, each stator iron core is provided with three armature modules which are evenly distributed in the circumferential direction, and each armature module comprises long armature teeth, short armature teeth and armature windings. The tail ends of the long and short teeth adopt an inclined air gap and magnetism gathering pole shoe design; the secondary part comprises a Y-shaped secondary pole iron core and a Halbach permanent magnet array on the surface of the Y-shaped secondary pole iron core, and the permanent magnet array is divided into three areas in the circumferential direction, and the three areas correspond to the three-phase armature modules of the primary part respectively; the permanent magnets in each area are formed by staggering N poles and S poles in the axial direction, and the adjacent areas are staggered in the axial direction.