Outer rotor type axial magnetic field motor and automobile

Abstract

The utility model discloses an outer rotor type axial magnetic field motor and an automobile, the motor comprises a stator module and a rotor module, the stator module comprises a stator shaft and a winding assembly fixed on the stator shaft; the rotor module comprises a rotor frame and a rotor core, the rotor frame comprises an end plate, and the end plate is rotationally connected to the stator shaft and located on one shaft side, along the axis of the stator shaft, of the winding assembly; the rotor core is arranged on the inner side of the end plate facing the winding assembly. By means of the mode, the circumferential size and the radial size can be saved, positioning and assembling are convenient, and the high electric drive stability and the good NVH performance are achieved.

Description

Technical Field

[0001] The present application belongs to the field of motor technology, and specifically relates to an outer rotor type axial magnetic field motor and a vehicle. Background Art

[0002] An outer rotor motor is a motor structure in which the rotor is in the shape of a ring, the stator of the excitation coil is located inside, and the rotor rotates outside. In the electric vehicle industry, the outer rotor motor is highly favored due to its high efficiency and high torque characteristics. It provides electric vehicles with excellent acceleration performance and driving range.

[0003] The circumferential and radial dimensions of existing hybrid excitation devices are too large, resulting in partial space waste and difficulty in positioning and assembling the excitation device, as well as posing great challenges to electric drive stability and NVH (noise, vibration and harshness). Utility Model Content

[0004] The present application provides an outer rotor axial magnetic field motor and a vehicle, which can save circumferential and radial dimensions, facilitate positioning and assembly, and have high electric drive stability and good NVH performance.

[0005] In order to solve the above technical problems, a technical solution adopted in the present application is: to provide an outer rotor type axial magnetic field motor, comprising: a stator module and a rotor module, the stator module comprising a stator shaft and a winding assembly fixed on the stator shaft; the rotor module comprising a rotor frame and a rotor core, the rotor frame comprising an end plate, the end plate is rotatably connected to the stator shaft and is located on one axial side of the winding assembly along the axis of the stator shaft; the rotor core is arranged on the inner side of the end plate toward the winding assembly.

[0006] Preferably, the rotor frame also includes a cylindrical member, the number of the end plates is two, the two end plates are symmetrically arranged on both sides of the cylindrical assembly along the axis, the cylindrical member and the end plates are detachably connected and the two together form a cavity, and the winding assembly is located in the cavity; the rotor core is arranged so that each end plate faces the inner side of the cavity; wherein the axis of the cylindrical member coincides with the axis of the stator shaft.

[0007] Preferably, the rotor core comprises a plurality of magnetic steels and a first magnetic conductor, and the magnetic steels and the first magnetic conductors are alternately arranged on the inner side of each of the end plates, wherein the magnetic steels and the first magnetic conductors are arranged in a ring shape with the axis of the stator shaft as the center.

[0008] Preferably, the rotor module further includes a second magnetic conductor, which is an annular cylindrical structure, and the second magnetic conductor is fixed to the inner wall of the cylindrical member facing the cavity.

[0009] Preferably, the stator module further includes two stator disks, which are spaced apart along the axis, fixed to the outer periphery of the stator shaft, and the winding assembly is plugged into the stator disks.

[0010] Preferably, the winding assembly includes an iron core unit and a coil wound outside the iron core unit, each of the stator disks is provided with a slot, and each of the slots extends radially along the corresponding stator disk to penetrate the outer circumferential surface of the stator disk; each of the slot side walls is provided with an axial limiting portion, each of the iron core units is radially inserted into the slot, and the iron core unit side walls are provided with an axial matching portion that matches the axial limiting portion.

[0011] Preferably, each of the core monomers includes a first part and a second part arranged at opposite ends of the first part, the orthographic projection of the first part on the second part along the axis is located within the second part, the first part extends along the axis of the stator shaft, the coil is wound outside the first part, the second part is plug-fitted with the slot, and the axial matching part is arranged on each side wall of the second part.

[0012] Preferably, the rotor module further comprises a magnetically conductive pressure plate, which is located on a side of the rotor core facing the winding assembly and is fixedly connected to the end plate.

[0013] Preferably, the winding assembly includes an iron core unit and a coil wound outside the iron core unit, each of the stator disks is provided with a through hole extending in the axial direction, and the two ends of the winding assembly are respectively plugged into the corresponding two through holes, and the stator shaft assembly also includes a magnetic pressure plate, which is axially fixed on the outer side of the stator disk toward the end plate.

[0014] In order to solve the above technical problems, a technical solution adopted in the present application is: to provide a car, comprising the outer rotor type axial magnetic field motor described in any embodiment.

[0015] Different from the prior art, the beneficial effects of the present application are as follows: the end plate provided in the present application is used as a bracket to fix the rotor core, and the rotor core is located on the side of the end plate facing the winding assembly, that is, the rotor core and the winding assembly are arranged relative to each other in the axial direction, and the rotor module and the stator module are assembled in the axial direction, which is simpler than radial assembly. At the same time, the above arrangement makes the size of the motor mainly develop in the axial direction, thereby limiting the size of the motor in the circumferential and radial directions, and can reduce the rotational inertia of the motor, thereby improving the stability of the electric drive and reducing the noise caused by the rotation of the motor, and improving the NVH performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work, among which:

[0017] Figure 1 This is a schematic structural diagram of an embodiment of an outer rotor type axial magnetic field motor of the present application;

[0018] Figure 2 for Figure 1 Sectional view in the AA direction;

[0019] Figure 3 This is a structural schematic diagram of another embodiment of the outer rotor type axial magnetic field motor of the present application;

[0020] Figure 4 This is a structural schematic diagram of an implementation scheme of a stator module of the present application;

[0021] Figure 5 This is a schematic structural diagram of an implementation method of an iron core monomer of the present application;

[0022] Figure 6 This is a structural schematic diagram of an implementation scheme of a winding assembly of the present application;

[0023] Figure 7 This is a structural schematic diagram of another embodiment of the outer rotor type axial magnetic field motor of the present application;

[0024] Figure 8 yes Figure 7 Cross-sectional view along the BB direction. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0026] See also Figure 1 , Figure 1 This is a schematic diagram of the structure of an embodiment of an outer rotor axial magnetic field motor of the present application. Figure 2 for Figure 1The outer rotor type axial magnetic field motor 100 includes a stator module 10 and a rotor module 20. The stator module 10 includes a stator shaft 110 and a winding assembly 120 fixed on the stator shaft 110. The rotor module 20 includes a rotor frame 210 and a rotor core 220. The rotor frame 210 includes an end plate 211, which is rotatably connected to the stator shaft 110 and is located on one side of the winding assembly 120 along the axis of the stator shaft 110; the rotor core 220 is arranged on the inner side of the end plate 211 facing the winding assembly 120.

[0027] Specifically, Figure 2 As shown, the end of the stator shaft 110 is sleeved with a bearing 112, and the end plate 211 is sleeved on the bearing 112 to achieve relative rotation between the end plate 211 and the stator shaft 110. The end plate 211 is used as a bracket to fix the rotor core 220. The rotor core 220 is located on the side of the end plate 211 facing the winding assembly 120. The shape of the rotor core 220 is fan-shaped, which can ensure that the rotor core 220 has a sufficient area. That is, the rotor core 220 and the winding assembly 120 are arranged relative to each other in the axial direction, and the rotor module 20 and the stator module 10 are assembled in the axial direction. This assembly method is more convenient than radial assembly, and positioning is simpler. At the same time, the above-mentioned setting makes the size of the motor mainly develop in the axial direction, thereby limiting the size of the motor in the circumferential and radial directions, and can reduce the rotational inertia of the motor, thereby improving the stability of the electric drive and reducing the noise caused by the rotation of the motor, and improving the NVH performance.

[0028] Optionally, continue to Figure 2 The rotor frame 210 also includes a cylindrical member 212, and the number of end plates 211 is two. The two end plates 211 are symmetrically arranged on both sides of the cylindrical member 212 along the axis. The cylindrical member 212 and the end plates 211 are detachably connected and the two together form a cavity 210a. The winding assembly 120 is located in the cavity 210a. The rotor core 220 is arranged with each end plate 211 facing the inner side of the cavity 210a, wherein the axis of the cylindrical member 212 coincides with the axis of the stator shaft 110. Specifically, in this embodiment, the cylindrical member 212 is a hollow cylindrical structure with both ends penetrated, and both ends of the cylindrical member 212 are closed by end plates 211. The end plates 211 and the end faces of the cylindrical member 212 are connected by bolts (not shown) to form a three-section rotor frame 210 structure in the axial direction. The cylindrical cavity 210a formed inside is used to accommodate the winding assembly 120. Since the rotor cores 220 are symmetrically provided on both sides of the winding assembly 120 in the axial direction, the motor has a larger torque and the structure is more stable and reliable.

[0029] Alternatively, see Figure 3 , Figure 3This is a schematic diagram of the structure of another embodiment of the outer rotor axial magnetic field motor of the present application. In this embodiment, the cylindrical member 212 is a hollow structure with one end open and the other end closed. The cylindrical member 212 is only open on one side and is detachably connected to the end plate 211. The rotor core 220 is arranged on the inner side of the end plate 211, that is, a two-stage rotor frame 210 structure is formed in the axial direction, and the rotor core 220 is only arranged on one side of the winding assembly 120. Since only one side of the end plate 211 is connected to the stator shaft 110 through the bearing 112 in this embodiment, a structure supported by a single bearing 112 is adopted, and the end of the stator shaft 110 away from the bearing 112 is located in the cavity 210a and does not protrude from the rotor module 20, making its axial size smaller, so it is suitable for motor types with higher axial size requirements such as automobile hub motors.

[0030] Optionally, continue to Figure 1 The rotor core 220 includes a plurality of magnetic steels 221 and a first magnet 222, and the magnetic steels 221 and the first magnet 222 are alternately arranged on the inner side of each end plate 211, wherein the magnetic steels 221 and the first magnet 222 are arranged in a ring shape with the axis of the stator shaft 110 as the center. Furthermore, the magnetic steels 221 and the first magnet 222 are evenly distributed in the circumferential direction. The first magnet 222 realizes magnetic conductivity in the axial and circumferential directions. In this embodiment, the positive projections of the magnetic steels 221 and the first magnet 222 on the end plate 211 are both fan-shaped, and the fan-shaped size is set according to the actual situation, and this application does not make specific restrictions. The magnetic steels 221 and the first magnet 222 can be embedded in the end plate 211 to achieve the fixation of the rotor core 220 with the magnetic steels 221 and the first magnet 222.

[0031] Further, see Figure 2 The rotor module 20 also includes a first magnetic conductive pressure plate 230, which is located on the side of the rotor core 220 facing the winding assembly 120 and is fixedly connected to the end plate 211. Specifically, the first magnetic conductive pressure plate 230 can be locked on the inner side of the end plate 211 by bolts (not shown), so that the first magnetic conductive pressure plate 230 and the end plate 211 press the magnetic steel 221 and the first magnetic conductor 222 located inside from both sides. In addition, the first magnetic conductive pressure plate 230 also has magnetic conductivity, which further improves the performance of the motor. In this embodiment, the first magnetic conductive pressure plate 230 is a part of the rotor module 20 and rotates with the rotor frame 210.

[0032] Optionally, continue to Figure 2The rotor module 20 also includes a second magnetizer 223, which is an annular cylindrical structure. The second magnetizer 223 is fixed to the inner wall of the cylindrical member 212 facing the cavity 210a. Specifically, the second magnetizer 223 can be embedded in the inner wall of the cylindrical member 212, or fixed by bolts. The second magnetizer 223 is circumferentially arranged on the outer side of the winding assembly 120 to achieve magnetic conductivity in the radial and circumferential directions. The combination of the first magnetizer 222 and the second magnetizer 223 realizes hybrid excitation, which improves the weak magnetic speed expansion capability of the motor, the control accuracy under low torque load, and the short-term strong overload capability.

[0033] Optionally, see Figure 4 , Figure 4 The schematic diagram of the structure of one embodiment of the stator module of the present application. The stator module 10 also includes two stator disks 111, which are spaced apart along the axis, fixed to the outer periphery of the stator shaft 110, and the winding assembly 120 is plugged into the stator disk 111. Specifically, a plurality of winding assemblies 120 are evenly plugged into the stator disk 111 along the circumferential direction to achieve circumferential limitation, and then an annular excitation coil or carbon fiber wrapping (not shown) is used outside the axial direction of the winding assembly 120 to limit the radial direction, and then the space between the stator disks 111 is filled with potting glue to fix the entire stator module 10.

[0034] Specifically, see Figure 5 and Figure 6 , Figure 5 This is a schematic structural diagram of an implementation scheme of an iron core monomer of the present application. Figure 6 The winding assembly 120 includes a core unit 121 and a coil 122 . The cross section of the core unit 121 perpendicular to the axial direction is fan-shaped. The coil 122 is wound on the outer peripheral surface of the core unit 121 .

[0035] Optionally, continue to Figure 5 and Figure 6Each core monomer 121 includes a first portion 1211 and a second portion 1212 disposed at opposite ends of the first portion 1211. The orthographic projection of the first portion 1211 along the axis of the second portion 1212 is located inside the second portion 1212. The first portion 1211 extends along the axis of the stator shaft (not shown), that is, the first portion 1211 is retracted relative to the second portion 1212, and an annular groove 121a is formed outside the first portion 1211. The coil 122 is wound outside the first portion 1211, that is, the coil 122 is disposed in the annular groove 121a. The annular groove 121a facilitates the positioning of the coil 122, and at the same time makes the outer diameter of the first portion 1211 after winding less than or equal to the outer diameter of the second portion 1212, so as to facilitate the plugging of the winding assembly 120 with the stator disk 111. Optionally, the thickness of the second portion 1212 is consistent with the thickness of the stator disk 111, so that the second portion 1212 is disposed corresponding to the stator disk 111.

[0036] There are many possible directions for connecting the winding assembly 120 and the stator disk 111. Figure 4 In the embodiment shown, the winding assembly 120 is plugged into the stator disk 111 in the radial direction. Specifically, each stator disk 111 is provided with a slot 1111, and the slot 1111 is fan-shaped. Each slot 1111 extends along the radial direction of the corresponding stator disk 111 to the outer peripheral surface 111a of the stator disk 111. Each slot 1111 has an axial limit portion 111b on its side wall, and each core unit 121 is plugged into the slot 1111 in the radial direction. Figure 5 As shown, the side wall of the core monomer 121 is provided with an axial matching portion 1213 that matches the axial limiting portion 111b. Optionally, the second portion 1212 is plugged and matched with the slot 1111, and the axial matching portion 1213 is arranged on each side wall of the second portion 1212 to avoid interference between the coil 122 and the stator disk 111. Specifically, in this embodiment, the axial limiting portion 111b is a T-shaped slot located on the side wall of the slot 1111, and the axial matching portion 1213 is a T-shaped boss located on the side wall of the second portion 1212. When the core monomer 121 is plugged into the slot 1111 in the radial direction, the T-shaped boss is plugged and matched with the T-shaped slot, and the two are mutually limited in the axial direction. In other embodiments, the positions of the T-shaped slot and the T-shaped boss can be interchangeable, the axial limiting portion 111b can also be other structures such as an arc groove and a dovetail groove, and the axial matching portion 1213 can also be a graphic protrusion, a dovetail protrusion, etc. that cooperate therewith, and any matching structure that can achieve axial limiting is acceptable. In this embodiment, after plugging in, the stator disk 111 and the winding assembly 120 are positioned in the axial and circumferential directions at the same time. After the plugging in is completed, the radial limitation is achieved by using an annular excitation coil or carbon fiber wrapping.

[0037] Alternatively, see Figure 7 and Figure 8 , Figure 7 This is a schematic diagram of the structure of another embodiment of the outer rotor axial magnetic field motor of the present application. Figure 8 yes Figure 7 A cross-sectional view in the BB direction. In the present embodiment, the winding assembly 120 is plugged into the stator disk 111 along the axial direction. Specifically, each stator disk 111 is provided with a through hole 1112 extending along the axial direction, and specifically, the through hole 1112 is a sector-shaped shape consistent with the cross-section of the winding assembly 120. The two ends of the winding assembly 120 are respectively plugged into the corresponding two through holes 1112 to achieve the radial and circumferential positioning of the winding assembly 120 and the stator disk 111. The stator shaft 110 assembly also includes a second magnetic conductive pressure plate 130, which is axially fixed to the outer side of the stator disk 111 toward the cavity 210a. After the plug-in is completed, the second magnetic conductive pressure plate 130 is fixed to the outer side of the stator disk 111, thereby achieving the axial positioning of the winding assembly 120. In addition, the second magnetic conductive pressure plate 130 also has magnetic conductivity, which further improves the performance of the motor. In this embodiment, the second magnetic conductive pressure plate 130 is a part of the stator module 10 and is stationary during use. After completing the radial, axial and circumferential positioning, an annular excitation coil or carbon fiber wrapping is used, and finally potting is performed to fix the entire stator module 10.

[0038] The present application also provides an automobile, comprising the outer rotor type axial magnetic field motor described in any embodiment. The motor can be used as a driving motor of the automobile, and the driving motor can be located in the engine compartment, near the front and rear axles, under the chassis, and on the subframe, suspension system, or integrated on the wheel hub. The motor of the present application is particularly suitable for installation positions with high radial and circumferential space requirements.

[0039] The above are merely embodiments of the present application and are not intended to limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. An outer rotor type axial magnetic field motor, characterized in that: include: A stator module, comprising a stator shaft and a winding assembly fixed on the stator shaft; A rotor module, comprising a rotor frame and a rotor core, wherein the rotor frame comprises an end plate, the end plate is rotatably connected to the stator shaft and is located on one side of the winding assembly along the axis of the stator shaft; The rotor core is arranged on the inner side of the end plate facing the winding assembly.

2. The outer rotor type axial magnetic field motor according to claim 1, characterized in that: The rotor frame further comprises a cylindrical member, the number of the end plates is two, the two end plates are symmetrically arranged on both sides of the cylindrical member along the axis, the cylindrical member and the end plates are detachably connected and the two together form a cavity, and the winding assembly is located in the cavity; The rotor core is provided with each end plate facing the inner side of the cavity; Wherein, the axis of the cylindrical member coincides with the axis of the stator shaft.

3. The outer rotor type axial magnetic field motor according to claim 1, characterized in that: The rotor core includes a plurality of magnetic steels and a first magnetic conductor, and the magnetic steels and the first magnetic conductors are alternately arranged on the inner side of each end plate, wherein the magnetic steels and the first magnetic conductors are arranged in a ring shape with the axis of the stator shaft as the center.

4. The outer rotor type axial magnetic field motor according to claim 2, characterized in that: The rotor module further includes a second magnetic conductor, which is an annular cylindrical structure and is fixed to the inner wall of the cylindrical member facing the cavity.

5. The outer rotor type axial magnetic field motor according to any one of claims 1 to 4, characterized in that: The stator module also includes two stator discs, which are spaced apart along the axis, fixed on the outer periphery of the stator shaft, and the winding assembly is plugged into the stator discs.

6. The outer rotor type axial magnetic field motor according to claim 5, characterized in that: The winding assembly includes an iron core unit and a coil wound outside the iron core unit. Each stator disk is provided with a slot, and each slot extends along the radial direction of the corresponding stator disk to penetrate the outer circumferential surface of the stator disk; each slot side wall is provided with an axial limiting portion, and each iron core unit is radially inserted into the slot, and the iron core unit side wall is provided with an axial matching portion that matches the axial limiting portion.

7. The outer rotor type axial magnetic field motor according to claim 6, characterized in that: Each of the core monomers includes a first part and a second part arranged at opposite ends of the first part, the orthographic projection of the first part on the second part along the axis is located within the second part, the first part extends along the axis of the stator shaft, the coil is wound outside the first part, the second part is plug-fitted with the slot, and the axial matching part is arranged on each side wall of the second part.

8. The outer rotor type axial magnetic field motor according to claim 6, characterized in that: The rotor module further includes a magnetically conductive pressure plate, which is located on a side of the rotor core facing the winding assembly and is fixedly connected to the end plate.

9. The outer rotor type axial magnetic field motor according to claim 5, characterized in that: The winding assembly includes an iron core unit and a coil wound outside the iron core unit. Each stator disk is provided with a through hole extending in the axial direction. The two ends of the winding assembly are respectively plugged into the corresponding two through holes. The stator shaft assembly also includes a magnetic pressure plate, which is axially fixed on the outer side of the stator disk toward the end plate.

10. An automobile, characterized in that: It comprises an outer rotor type axial magnetic field motor as claimed in any one of claims 1 to 9.

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