Magnetic yokeless stator assembly and axial permanent magnet wheel-hub motor

Abstract

The present application relates to a kind of non-magnetic yoke stator assembly and axial permanent magnet wheel hub type motor.It solves the technical problems such as the weight of existing stator.It includes the stator body with stator coil winding and stator core assembly, the stator coil winding is annular structure arranged by the circumferential distribution of several stator coil groups, the stator core assembly has several magnetic conductors, the stator coil winding and the stator core assembly are connected by the solidification of insulating diamagnetic thermosetting material to form stator solid support between the stator coil winding and the stator core assembly, and the stator solid support has inner diamagnetic structure and / or outer diamagnetic structure.The advantages are that the stator yoke structure is cancelled, the magnetic resistance is small, the volume and weight of the stator are reduced, the inner and outer diamagnetic structures can reduce the radial diffusion of magnetic force, the conversion rate of magnetic field force to power is high, and the loss is small.The wheel hub motor has strong stability, and the flat design reduces the shaft size of the wheel hub motor.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of motor equipment, and particularly relates to a no-magnetic-yoke stator assembly and an axial permanent-magnetic wheel-hub type motor. BACKGROUND

[0002] The axial permanent-magnetic wheel-hub type motor has many advantages as a new energy driving motor, for example, it can be directly installed in the wheel hub of a vehicle, directly drives the vehicle to run, saves the space occupied by the power system of the vehicle, and reduces the weight and structural complexity of the vehicle. The biggest feature is that the driving, transmission and braking devices are integrated into the wheel hub, and the transmission components such as the clutch, transmission, transmission shaft, differential, and transfer are omitted. With the increasing attention of consumers to new energy vehicles, the wheel-hub motor technology will also enter the field of vision of people, and lead to an explosive growth in demand for wheel-hub motors. Since the wheel-hub motor is installed in the wheel hub of the vehicle, the installation space of the motor is very limited, and the stator assembly of the existing ordinary wheel-hub motor generally has a stator magnetic yoke. The magnetic yoke itself does not produce a magnetic field, and only plays a role in transmitting magnetic lines in the magnetic circuit. However, due to the large volume and weight of the rotor magnetic yoke, it is easy to cause the motor to have a large volume and weight, which is not conducive to the installation and arrangement of the vehicle. This undoubtedly has a certain impact on the development of the axial permanent-magnetic wheel-hub type motor.

[0003] In order to solve the problems existing in the prior art, people have carried out long-term exploration and put forward various solutions. For example, a high-power-density axial flux wheel-hub motor with a short axial structure is disclosed in Chinese patent documents [application number: CN201921386106.4]: a planetary reducer is connected to the output shaft of the rotor assembly, and the reducer output shaft of the planetary reducer is connected to the wheel hub bearing unit; the axial flux stator assembly includes a water-cooled shell, the inner wall of the water-cooled shell is provided with a plurality of fins, the winding is wound on the stator core and embedded between the adjacent fins on the inner wall of the water-cooled shell and fixed by glue pouring.

[0004] The above-mentioned scheme adopts a double-rotor stator block no-magnetic-yoke axial flux topology structure, which realizes the no-magnetic-yoke of the wheel-hub motor, but due to the internal arrangement of the planetary reducer and other components, the volume and weight of the wheel-hub motor are increased to a certain extent. At the same time, the scheme still has the problems of low conversion rate of magnetic force to power and large magnetic force loss. SUMMARY

[0005] The purpose of the present application is to solve the above-mentioned problems, and to provide a no-magnetic-yoke stator assembly with small magnetic force loss.

[0006] Another purpose of the present application is to solve the above-mentioned problems, and to provide an axial permanent-magnetic wheel-hub type motor with high stability and large power.

[0007] In order to achieve the above object, the following technical scheme is adopted in the present application: the non-magnetic yoke stator assembly comprises a stator body with a stator coil winding and a stator core assembly, characterized in that the stator coil winding is in a ring structure formed by circumferential distribution of a plurality of stator coil groups, the stator core assembly has a plurality of magnetic conductors circumferentially distributed with the center of the stator coil winding and embedded in adjacent two stator coil groups respectively, and the stator coil winding and the stator core assembly are connected by an insulating and magnetic heat-cured material to form a stator solid support between the stator coil winding and the stator core assembly, and the stator solid support has an inner magnetic structure on the circumferential inner side of the stator core assembly and / or an outer magnetic structure on the circumferential outer side of the stator core assembly.

[0008] In the above non-magnetic yoke stator assembly, the middle part between the adjacent two stator coil groups forms a winding gap, the winding gap is circumferentially and uniformly distributed, the magnetic conductors are in a sheet shape and are embedded in the winding gap respectively, and the two ends of the stator solid support are circumferentially provided with annular magnetic conductive surfaces corresponding to the stator core assembly.

[0009] In the above non-magnetic yoke stator assembly, the inner magnetic structure comprises an inner annular magnetic part formed on the circumferential inner side of the stator solid support and located on the circumferential inner side of the stator core assembly, and the stator coil winding is cured in the inner annular magnetic part away from the circumferential inner side of the stator core assembly; the outer magnetic structure comprises an outer annular magnetic part formed on the circumferential outer side of the stator solid support and located on the circumferential outer side of the stator core assembly, and the stator coil winding is cured in the outer annular magnetic part as a whole or partially away from the circumferential outer side of the stator core assembly.

[0010] In the above non-magnetic yoke stator assembly, the inner annular magnetic part and the outer annular magnetic part are concentrically distributed and the outer annular magnetic part is located on the circumferential outer side of the inner annular magnetic part, the stator solid support is formed by pouring of a resin material to form the above-mentioned outer annular magnetic part and inner annular magnetic part, and a solid connecting part is formed on the outer annular magnetic part and the inner annular magnetic part to cover the outer side of the end surface of the stator coil winding and / or the stator core assembly.

[0011] In the above non-magnetic yoke stator assembly, the stator solid support is in a ring shape and the center of the stator solid support is provided with a motor shaft through a stator shaft mounting structure.

[0012] In the above-mentioned non-magnetic yoke stator assembly, the stator shaft mounting structure comprises a stator shaft fixing hole formed in the center of the stator fixed support, the motor shaft is arranged in the stator shaft fixing hole, the motor shaft has a motor shaft mounting seat at one end of the stator fixed support on the outer side in the circumferential direction of the motor shaft, and a plurality of positioning keys are arranged on the outer side in the circumferential direction of the motor shaft; the stator shaft fixing hole has a plurality of key grooves corresponding to the positioning keys respectively and matched with each other in the circumferential direction; the motor shaft is sleeved with a motor shaft fixing seat at the other end of the stator fixed support on the outer side in the circumferential direction of the motor shaft, and the motor shaft fixing seat has a plurality of positioning grooves matched with the positioning keys in the inner side in the circumferential direction of the motor shaft fixing seat; the stator fixed support is provided with a plurality of through holes on the outer periphery of the stator shaft fixing hole in the circumferential direction, and the motor shaft fixing seat and the motor shaft mounting seat are arranged correspondingly and connected by a fixing screw assembly arranged in the through holes; the motor shaft is hollow, and a plurality of stator wires connected with the stator coil group are arranged in the motor shaft; one end of the stator wire is embedded in the stator fixed support, and the other end of the stator wire is arranged from the through hole in the inner side in the circumferential direction of the stator shaft fixing hole and into the motor shaft through the wire groove on the outer side in the circumferential direction of the motor shaft; the motor shaft, the motor shaft mounting seat and the motor shaft fixing seat are made of non-magnetic material.

[0013] In the above-mentioned non-magnetic yoke stator assembly, each stator coil group has two flat and curved stator coil bodies, and each stator coil body comprises a vertical part, an outer coil curved part arranged obliquely at the upper end of the vertical part, an outer coil connecting part arranged obliquely at the upper end of the outer coil curved part, an inner coil curved part arranged obliquely at the lower end of the vertical part in a direction different from that of the outer coil curved part, and an inner coil connecting part arranged obliquely at the lower end of the inner coil curved part; the outer coil connecting parts or the inner coil connecting parts of the two stator coil bodies arranged in a staggered manner in different stator coil groups in the stator coil winding are arranged close to each other, the vertical parts of the stator coil bodies in the same stator coil group are arranged adjacent to each other, and the winding gap is formed between the vertical parts of the stator coil bodies of the adjacent two stator coil groups; the outer coil curved parts and the inner coil curved parts of the stator coil bodies in the same stator coil group are arranged obliquely in different directions respectively, and the outer coil curved parts or the inner coil curved parts of the stator coil bodies arranged in a staggered manner in the adjacent two stator coil groups are arranged in a cross manner; the outer coil curved parts of the stator coil bodies in the stator coil group are fixed in the outer annular non-magnetic part respectively at one end close to the vertical part, and the inner coil curved parts and the inner coil connecting parts of the stator coil bodies in the stator coil group are fixed in the inner annular non-magnetic part respectively; the magnetic conductor is made of a plurality of silicon steel sheets stacked together, and the magnetic conductor is arranged on one side of the vertical part or flush with one side of the vertical part.

[0014] The axial permanent magnet wheel hub motor with the above-mentioned non-magnetic yoke stator assembly is as follows: the axial permanent magnet wheel hub motor comprises a motor shell, the motor shell is circumferentially arranged on a motor shaft, a stator body is fixedly arranged on the motor shaft, and a rotor assembly is arranged on both sides of the stator body and is rotatably arranged on the motor shaft and connected with the motor shell, the rotor assembly is in the shape of an annular sheet and has a plurality of permanent magnets on the side close to the stator body in the circumferential direction, and the permanent magnets correspond to annular magnetic guide surfaces on the stator body stator fixed support end face respectively.

[0015] In the above-mentioned axial permanent magnet wheel hub motor, the rotor assembly comprises a magnetic steel frame in the shape of an annular sheet and sleeved on the motor shaft, the magnetic steel frame has a plurality of magnetic steel mounting holes in the circumferential direction, and a permanent magnet is arranged in each mounting hole, and the side of the magnetic steel frame away from the stator body is connected with the motor shell through a rotor core arranged concentrically with the magnetic steel frame and in the shape of an annular sheet.

[0016] In the above-mentioned axial permanent magnet wheel hub motor, the motor shell comprises two motor end covers sleeved on the motor shaft through mounting bearings and arranged corresponding to each other, the inner side of the motor end cover has an annular groove for mounting the rotor core, and a motor base in the shape of a cylinder and having a plurality of heat dissipation ribs in the circumferential direction is arranged between the motor end covers, the motor base is located at the circumferential periphery of the stator body, and the motor end cover and the motor base are connected through a motor mounting bolt assembly.

[0017] Compared with the prior art, the present application has the following advantages:

[0018] 1. The stator magnetic yoke structure is cancelled, the magnetic resistance is small, the volume and weight of the stator are reduced, the production cost is saved, the internal and external magnetic structures can reduce the radial diffusion of magnetic force, the conversion rate of magnetic field force to power is high, and the loss is small;

[0019] 2. The wheel hub motor adopts a double-rotor structure, has large power and high stability, and the flat design reduces the shaft size of the wheel hub motor. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 is a structure diagram of the stator body in the present application;

[0021] Figure 2 is a structure sectional view of the stator body in the present application;

[0022] Figure 3 is an exploded view of the structure of the stator body in the present application;

[0023] Figure 4 is a partial structure diagram of the stator coil winding in the present application;

[0024] Figure 5is the structural schematic diagram of the motor in the present application;

[0025] Figure 6 is the structural sectional view of the motor in the present application;

[0026] Figure 7 is the structural exploded view of the motor in the present application;

[0027] Figure 8 is the structural exploded view of the rotor assembly in the present application;

[0028] In the figure, the stator body 1, the stator coil winding 2, the stator coil group 21, the stator coil body 211, the vertical part 212, the coil outer curved part 213, the coil outer connecting part 214, the coil inner curved part 215, the coil inner connecting part 216, the winding gap 22, the annular magnetic conducting surface 23, the stator core assembly 3, the magnetic conducting body 31, the stator fixed support 4, the inner annular magnetic isolation part 41, the outer annular magnetic isolation part 42, the fixed connecting part 43, the stator shaft mounting structure 5, the stator shaft fixing hole 51, the motor shaft mounting seat 52, the positioning key 53, the key groove 54, the motor shaft fixing seat 55, the positioning groove 56, the through hole 57, the fixed screw assembly 58, the stator wire 59, the wire threading hole 591, the wire threading groove 592, the motor shaft 6, the motor shell 7, the mounting bearing 71, the motor end cover 72, the annular groove 73, the motor base 74, the motor mounting bolt assembly 75, the rotor assembly 8, the permanent magnet 81, the magnetic steel frame 82, the magnetic steel mounting hole 83, the rotor core 84. DETAILED DESCRIPTION

[0029] The present application will be further described in detail below in combination with the drawings and specific embodiments.

[0030] As Figures 1-3As shown, the non-magnetic yoke stator assembly includes a stator body 1 with a stator coil winding 2 and a stator core assembly 3, the stator coil winding 2 is in the form of an annular structure formed by a plurality of stator coil groups 21 distributed circumferentially, and the stator core assembly 3 has a plurality of magnetic conductors 31 distributed circumferentially with the center of the stator coil winding 2 as the center and embedded in the adjacent two stator coil groups 21 respectively, preferably, the middle part of the adjacent two stator coil groups 21 forms a winding gap 22, the winding gap 22 is uniformly distributed circumferentially, and the magnetic conductors 31 are in the form of a sheet and are embedded in the winding gap 22 respectively, and the stator solid support 4 has a corresponding annular magnetic surface 23 on the circumferential end face of both ends, wherein the magnetic conductors 31 can be formed by stacking a plurality of silicon steel sheets, which can not only reduce the processing cost and make the corner material available, but also improve the magnetic conductivity of the magnetic conductors 31 made of silicon steel sheets, and the stator coil winding 2 and the stator core assembly 3 are connected by an insulating and magnetic heat-cured material to form a stator solid support 4 between the stator coil winding 2 and the stator core assembly 3, and the stator solid support 4 has an inner magnetic structure located on the circumferential inner side of the stator core assembly 3 and / or an outer magnetic structure located on the circumferential outer side of the stator core assembly 3. Obviously, the inner magnetic structure and the outer magnetic structure can effectively prevent the magnetic force from spreading radially outward, improve the utilization efficiency of the magnetic force, make the conversion rate of the magnetic field force to power high, and reduce the loss. At the same time, the stator yoke structure is cancelled, the magnetic resistance is small, the volume and weight of the stator are reduced, and the production cost is saved.

[0031] Further, the inner magnetic structure includes an inner annular magnetic part 41 formed on the circumferential inner side of the stator solid support 4 and located on the circumferential inner side of the stator core assembly 3, and the stator coil winding 2 is cured in the inner annular magnetic part 41 away from the circumferential inner side of the stator core assembly 3; the outer magnetic structure includes an outer annular magnetic part 42 formed on the circumferential outer side of the stator solid support 4 and located on the circumferential outer side of the stator core assembly 3, and the stator coil winding 2 is cured in the outer annular magnetic part 42 away from the circumferential outer side of the stator core assembly 3. Obviously, the inner annular magnetic part 41 and the outer annular magnetic part 42 are located on the circumferential inner side and the outer side of the stator core assembly 3 respectively, which can effectively reduce the radial diffusion of the magnetic force of the stator core assembly 3.

[0032] Preferably, the inner annular magnetic shielding portion 41 and the outer annular magnetic shielding portion 42 are concentrically distributed, with the outer annular magnetic shielding portion 42 located circumferentially outside the inner annular magnetic shielding portion 41. The stator fixing bracket 4 is cast from resin material to form the aforementioned outer annular magnetic shielding portion 42 and inner annular magnetic shielding portion 41. A fixing connection portion 43 is formed on the outer annular magnetic shielding portion 42 and the inner annular magnetic shielding portion 41, covering the outer side of the end face of the stator coil winding 2 and / or the stator core assembly 3. Obviously, the fixing connection portion 43 is used to solidify the magnetic conductor 31 within the winding gap 22. The fixing connection portion 43 can protrude slightly beyond the outer side of the end face of the stator coil winding 2 or the stator core assembly 3, or it can be flush with it. This can improve the degree of solidification and prevent the fixing connection portion 43 from hindering the axial diffusion of the magnetic force of the stator core assembly 3.

[0033] In this embodiment, the stator mounting bracket 4 is annular, and a motor shaft 6 is mounted at the center of the stator mounting bracket 4 via a stator shaft mounting structure 5. The stator shaft mounting structure 5 includes a stator shaft fixing hole 51 formed at the center of the stator mounting bracket 4. Specifically, the inner annular non-magnetic portion 41 forms the stator shaft fixing hole 51 circumferentially. The motor shaft 6 passes through the stator shaft fixing hole 51. The motor shaft 6 has a motor shaft mounting seat 52 located at one end of the stator mounting bracket 4 circumferentially outward. Several positioning keys 53 are respectively provided on the outer side of the motor shaft 6 circumferentially. The stator shaft fixing hole 51 has keyways 54 circumferentially corresponding to and cooperating with the positioning keys 53. A motor shaft fixing seat 55 is provided on the other end of the stator fixing bracket 4. The motor shaft fixing seat 55 has a positioning groove 56 on its inner circumferential side that engages with the positioning key 53. The stator fixing bracket 4 is provided with several through holes 57 located on the outer circumferential side of the stator shaft fixing hole 51. The motor shaft fixing seat 55 and the motor shaft mounting seat 52 are correspondingly arranged and connected by fixing screw assemblies 58 passing through the through holes 57. Obviously, the stator fixing bracket 4 is clamped and fixed between the motor shaft fixing seat 55 and the motor shaft mounting seat 52 by the fixing screw assembly 58.

[0034] Furthermore, the motor shaft 6 is hollow, and several stator wires 59 connected to the stator coil group 21 are threaded through the motor shaft 6. One end of the stator wire 59 is embedded in the stator fixing bracket 4, and the other end passes through the wire hole 591 on the inner side of the stator shaft fixing hole 51 and enters the motor shaft 6 through the wire groove 592 on the outer side of the motor shaft 6. The motor shaft 6, the motor shaft mounting base 52 and the motor shaft fixing base 55 are all made of non-magnetic materials. For example, aluminum or other non-magnetic materials can be used here, which can further improve the radial non-magnetic effect.

[0035] like Figures 1-4As shown, in this embodiment, each stator coil group 21 has two flat, curved stator coil bodies 211, and each stator coil body 211 includes a vertical portion 212. The upper end of the vertical portion 212 has an inclined outer coil curved portion 213, and the upper end of the outer coil curved portion 213 has an outer coil connecting portion 214 bent outwards. The lower end of the vertical portion 212 has an inner coil curved portion 215 that is inclined in a different direction from the outer coil curved portion 213, and the lower end of the inner coil curved portion 215 has an inner coil connecting portion 216 bent outwards. The outer coil connecting portions 214 or inner coil connecting portions 216 on two stator coil bodies 211 in different stator coil groups 21 within the stator coil winding 2 are closely attached to each other, and the sides of the vertical portions 212 of the stator coil bodies 211 in the same stator coil group 21 are adjacent to each other. The winding gap 22 is formed in the stator of two adjacent stator coil groups 21. Between the vertical portions 212 of the coil body 211, the outer curved portion 213 and the inner curved portion 215 of the stator coil body 211 within the same group of stator coils 21 are inclined in different directions, and the outer curved portion 213 or the inner curved portion 215 of the stator coil body 211 in two adjacent stator coil groups 21 are staggered and arranged in a crisscross manner. The outer curved portion 213 of the stator coil body 211 in the stator coil group 21 is close to the vertical portion 212. One end of 12 is respectively solidified in the outer annular magnetic insulated part 42, and the inner coil bending part 215 and the inner coil connecting part 216 on the stator coil body 211 in the stator coil group 21 are respectively solidified in the inner annular magnetic insulated part 41. The magnetic conductor 31 extends beyond one side of the vertical part 212 or is flush with one side of the vertical part 212. Preferably, the magnetic conductor 31 extends slightly beyond the vertical part 212, and the solid connection part 43 covers the outside of the magnetic conductor 31 and / or the vertical part 212.

[0036] like Figures 5-8 As shown, in this embodiment, the axial permanent magnet hub motor includes a motor housing 7, which is rotatably mounted on a motor shaft 6. A stator 1 is fixedly mounted on the motor shaft 6, and rotor assemblies 8 are rotatably mounted on the motor shaft 6 and connected to the motor housing 7 on both sides of the stator 1. The rotor assembly 8 is annularly plate-shaped and has a plurality of permanent magnets 81 circumferentially mounted on the side closest to the stator 1. The permanent magnets 81 correspond to the annular magnetic conductive surface 23 on the end face of the stator fixed bracket 4 of the stator 1. There are two sets of rotor assemblies 8, which are located on both sides of the stator 1. The dual-rotor structure improves the power of the motor.

[0037] The rotor assembly 8 comprises a magnetic steel frame 82 in the shape of a ring sheet and sleeved on the motor shaft 6. The magnetic steel frame 82 has a plurality of magnetic steel mounting holes 83 in the circumferential direction, and each of the mounting holes is provided with a permanent magnet 81. The side of the magnetic steel frame 82 away from the stator body 1 is connected to the motor housing 7 through a rotor iron core 84 which is concentric with the magnetic steel frame 82 and in the shape of a ring sheet.

[0038] Preferably, the motor housing 7 comprises two motor end covers 72 sleeved on the motor shaft 6 through mounting bearings 71 and arranged opposite to each other. The inner side of the motor end cover 72 has an annular groove 73 for mounting the rotor iron core 84. A motor base 74 in the shape of a cylinder and having a plurality of heat dissipation ribs 741 in the circumferential direction is arranged between the motor end covers 72 and located at the circumferential periphery of the stator body 1. The motor end covers 72 and the motor base 74 are connected through a motor mounting bolt assembly 75.

[0039] The specific embodiments described herein merely exemplify the spirit of the present application. Those skilled in the art to which the present application pertains can make various modifications or supplements to the described specific embodiments or replace them with similar ways without departing from the spirit of the present application or exceeding the scope defined by the appended claims.

[0040] Although the terms such as the stator body 1, the stator coil winding 2, the stator coil group 21, the stator coil body 211, the vertical part 212, the coil outer curved part 213, the coil outer connecting part 214, the coil inner curved part 215, the coil inner connecting part 216, the winding gap 22, the annular magnetic conducting surface 23, the stator core assembly 3, the magnetic conducting body 31, the stator fixed support 4, the inner annular magnetic isolation part 41, the outer annular magnetic isolation part 42, the fixed connecting part 43, the stator shaft mounting structure 5, the stator shaft fixing hole 51, the motor shaft mounting seat 52, the positioning key 53, the key groove 54, the motor shaft fixing seat 55, the positioning groove 56, the through hole 57, the fixing screw assembly 58, the stator wire 59, the wire threading hole 591, the wire threading groove 592, the motor shaft 6, the motor housing 7, the mounting bearing 71, the motor end cover 72, the annular groove 73, the motor base 74, the motor mounting bolt assembly 75, the rotor assembly 8, the permanent magnet 81, the magnetic steel frame 82, the magnetic steel mounting hole 83, the rotor iron core 84, etc. are used more frequently in the description, but the possibility of using other terms is not excluded. The use of these terms is merely for the convenience of describing and explaining the essence of the present application; any interpretation of them as any kind of additional limitation is contrary to the spirit of the present application.

Claims

1. A magnet yoke-free stator assembly comprising a stator body (1) with stator coil windings (2) and a stator core assembly (3), characterized in that, The stator coil winding (2) is in a ring structure formed by circumferentially distributing a plurality of stator coil groups (21), the stator core assembly (3) has a plurality of magnetic conductors (31) circumferentially distributed with the center of the stator coil winding (2) and embedded in adjacent two stator coil groups (21) respectively, and the stator coil winding (2) and the stator core assembly (3) are connected by an insulating and magnetic heat-cured material to form a stator solid support (4) between the stator coil winding (2) and the stator core assembly (3), and the stator solid support (4) has an inner magnetic structure on the circumferential inner side of the stator core assembly (3) and / or an outer magnetic structure on the circumferential outer side of the stator core assembly (3); the inner magnetic structure includes an inner annular magnetic part (41) formed on the circumferential inner side of the stator solid support (4) and located on the circumferential inner side of the stator core assembly (3), and the stator coil winding (2) is cured in the inner annular magnetic part (41) away from the circumferential inner side of the stator core assembly (3); the outer magnetic structure includes an outer annular magnetic part (42) formed on the circumferential outer side of the stator solid support (4) and located on the circumferential outer side of the stator core assembly (3), and the stator coil winding (2) is integrally or partially cured in the outer annular magnetic part (42) away from the circumferential outer side of the stator core assembly (3); the inner annular magnetic part (41) and the outer annular magnetic part (42) are concentrically distributed respectively and the outer annular magnetic part (42) is located on the circumferential outer side of the inner annular magnetic part (41), the stator solid support (4) is formed by resin material pouring to form the above-mentioned outer annular magnetic part (42) and inner annular magnetic part (41), and the outer annular magnetic part (42) and the inner annular magnetic part (41) are formed with a solid connection part (43) covering the outer side of the end face of the stator coil winding (2) and / or the stator core assembly (3).

2. The magnet yokeless stator assembly of claim 1, wherein, The middle part of the adjacent two stator coil groups (21) forms a winding gap (22), the winding gap (22) is circumferentially uniformly distributed, and the magnetic conductors (31) are in a sheet shape and are embedded in the winding gap (22) respectively, and the stator solid support (4) has a ring-shaped magnetic conductive surface (23) corresponding to the stator core assembly (3) on the circumferential end face of both ends.

3. The magnet yokeless stator assembly of claim 1, wherein, The stator solid support (4) is in a ring shape and the center of the stator solid support (4) is provided with a motor shaft (6) through a stator shaft mounting structure (5).

4. The magnet yokeless stator assembly of claim 3, wherein, The stator shaft mounting structure (5) comprises a stator shaft fixing hole (51) formed in the center of the stator fixed support (4), the motor shaft (6) is arranged in the stator shaft fixing hole (51), the motor shaft (6) has a motor shaft mounting seat (52) at one end of the stator fixed support (4) on the circumferential outer side of the motor shaft (6), a plurality of positioning keys (53) are respectively arranged on the circumferential outer side of the motor shaft (6), the stator shaft fixing hole (51) has a key groove (54) corresponding to the positioning key (53) on the circumferential outer side of the motor shaft (6), the motor shaft (6) is sleeved with a motor shaft fixing seat (55) at the other end of the stator fixed support (4) on the circumferential outer side of the motor shaft (6), and the motor shaft fixing seat (55) has a positioning groove (56) on the circumferential inner side of the motor shaft fixing seat (55) and the positioning key (53) is clamped with each other, the stator fixed support (4) is provided with a plurality of through holes (57) on the circumferential outer side of the stator shaft fixing hole (51), and the motor shaft fixing seat (55) and the motor shaft mounting seat (52) are arranged correspondingly and are connected by a fixing screw assembly (58) arranged in the through hole (57); the motor shaft (6) is in a hollow shape, a plurality of stator wires (59) connected with the stator coil group (21) are arranged in the motor shaft (6), one end of the stator wire (59) is embedded in the stator fixed support (4), the other end of the stator wire (59) is arranged out of the through hole (591) on the circumferential inner side of the stator shaft fixing hole (51) and is arranged into the motor shaft (6) through the through groove (592) on the circumferential outer side of the motor shaft (6), and the motor shaft (6), the motor shaft mounting seat (52) and the motor shaft fixing seat (55) are all made of magnetic material.

5. The magnet yokeless stator assembly of claim 2, wherein, Each stator coil group (21) has two flat and curved stator coil bodies (211), each of which includes a vertical part (212) with an outer coil curved part (213) obliquely arranged at the upper end of the vertical part (212) and with an outer coil connecting part (214) arranged at the upper end of the outer coil curved part (213) and folded outward, and with an inner coil curved part (215) obliquely arranged at the lower end of the vertical part (212) in a direction different from that of the outer coil curved part (213) and with an inner coil connecting part (216) folded outward at the lower end of the inner coil curved part (215), the outer coil connecting parts (214) or the inner coil connecting parts (216) of the two stator coil bodies (211) arranged in a staggered manner in different stator coil groups (21) in the stator coil winding (2) are arranged in close contact with each other, the vertical parts (212) of the stator coil bodies (211) in the same stator coil group (21) are arranged adjacent to each other, and the winding gap (22) is formed between the vertical parts (212) of the stator coil bodies (211) of the adjacent two stator coil groups (21), the outer coil curved parts (213) and the inner coil curved parts (215) of the stator coil bodies (211) in the same stator coil group (21) are arranged obliquely in different directions, respectively, and the outer coil curved parts (213) or the inner coil curved parts (215) of the stator coil bodies (211) arranged in a staggered manner in the adjacent two stator coil groups (21) are arranged in a cross manner, the outer coil curved parts (213) of the stator coil bodies (211) in the stator coil group (21) are fixed in the outer annular non-magnetic part (42) at one end close to the vertical part (212), respectively, the inner coil curved parts (215) and the inner coil connecting parts (216) of the stator coil bodies (211) in the stator coil group (21) are fixed in the inner annular non-magnetic part (41), respectively, and the magnetic conductor (31) is formed by stacking a plurality of silicon steel sheets, and the magnetic conductor (31) on both sides is arranged beyond one side of the vertical part (212) or flush with one side of the vertical part (212).

6. An axial permanent magnet wheel hub motor having the non-magnetic yoke stator assembly of any one of claims 1-5, comprising a motor housing (7) circumferentially arranged on a motor shaft (6), the motor shaft (6) is fixedly provided with a stator body (1), and the stator body (1) is provided with a rotor assembly (8) arranged in rotation on the motor shaft (6) and connected with the motor housing (7) on both sides, and the rotor assembly (8) is annular and has a plurality of permanent magnets (81) on the side close to the stator body (1), and the permanent magnets (81) correspond to the annular magnetic conducting surface (23) on the end surface of the stator fixed support (4) of the stator body (1).

7. Axial permanent-magnet wheel-hub electric machine according to claim 6, characterized in that The rotor assembly (8) comprises a magnetic steel frame (82) in the shape of an annular sheet and sleeved on the motor shaft (6), the magnetic steel frame (82) is circumferentially provided with a plurality of magnetic steel mounting holes (83), and a permanent magnet (81) is arranged in each mounting hole, and the side of the magnetic steel frame (82) away from the stator body (1) is connected with the motor shell (7) through a rotor core (84) which is coaxial with the magnetic steel frame (82) and in the shape of an annular sheet.

8. Axial permanent-magnet wheel-hub electric machine according to claim 7, characterized in that The motor shell (7) comprises two motor end covers (72) which are sleeved on the motor shaft (6) through mounting bearings (71) and are arranged correspondingly, the inner side of the motor end cover (72) is provided with an annular groove (73) for mounting the rotor core (84), the motor end covers (72) are provided with a motor base (74) which is in the shape of a cylinder and circumferentially provided with a plurality of heat dissipation ribs (741), the motor base (74) is located at the circumferential periphery of the stator body (1), and the motor end covers (72) and the motor base (74) are connected through motor mounting bolt assemblies (75).

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