CN115224835A

CN115224835A - Motor, power assembly and vehicle

Info

Publication number: CN115224835A
Application number: CN202210754022.1A
Authority: CN
Inventors: 兰华; 陈金华; 周朝
Original assignee: Huawei Digital Power Technologies Co Ltd
Current assignee: Huawei Digital Power Technologies Co Ltd
Priority date: 2022-06-28
Filing date: 2022-06-28
Publication date: 2022-10-21
Also published as: WO2024001448A1

Abstract

The application relates to the technical field of motors, in particular to a motor, a power assembly and a vehicle. The motor comprises a rotating shaft, a stator assembly and a rotor assembly, wherein the stator assembly and the rotor assembly are both sleeved on the rotating shaft; the rotor subassembly includes rotor winding, rotor core and magnetizer, rotor core is located stator core, rotor core's first end and stator core's first end parallel and level, the magnetizer sets up the second end at rotor core, the one end that rotor core and stator core's second end parallel and level are kept away from to the magnetizer, the magnetizer includes first portion and second portion, the one end and the second portion of pivot are kept away from to the first portion are connected, first portion and second portion form the opening and deviate from the chamber that holds of rotor core, rotor winding's tip is located hold the chamber with in the accommodation space that stator module encloses. The motor in this application has a higher power density.

Description

Motor, power assembly and vehicle

Technical Field

The application relates to the technical field of motors, in particular to a motor, a power assembly and a vehicle.

Background

With the development of the technical level of the electric automobile industry and the improvement of the market requirement, the driving motor of the electric automobile develops towards the direction of higher power density, the consumption of raw materials of the driving motor with higher power density is less, the cost is reduced, and the arrangement of a power assembly in the automobile can be more flexible.

Therefore, how to increase the power density of the motor is a problem to be solved urgently.

Disclosure of Invention

The application provides a motor, power assembly and vehicle, this motor has higher power density.

In a first aspect, the present application provides a motor, including a rotating shaft, a stator assembly and a rotor assembly, wherein the stator assembly and the rotor assembly are both sleeved on the rotating shaft, the stator assembly includes a stator winding and a stator core, and the stator winding is located on the stator core; the rotor subassembly includes rotor winding, rotor core and magnetizer, rotor core is located stator core, wherein, rotor core includes the first end of perpendicular to pivot and the second end relative with first end, stator core includes the first end of perpendicular to pivot and the second end relative with first end, wherein, the first end of rotor core and stator core's first end parallel and level, the magnetizer sets up the second end at rotor core, the magnetizer is kept away from rotor core's one end and stator core's second end parallel and level, wherein, the magnetizer includes first portion and second portion, the pivot passes first portion, first portion extends along the radial direction of pivot, the second portion is connected with the one end that the pivot was kept away from to first portion, and the second portion extends to one side that is kept away from rotor core along the axial direction of pivot, first portion and second portion can form and hold the chamber, the opening that holds the chamber is located the one side that deviates from rotor core, rotor winding's tip sets up in holding the space that holds chamber and stator assembly enclose. Specifically, the magnetizer is arranged at the second end of the rotor core, and the magnetizer can conduct magnetic flux generated by the rotor winding to the second end of the stator core, so that electromagnetic interaction between the stator core and the rotor core is realized, induced electromotive force and torque are generated, and the torque and power of the motor are ensured to be basically unchanged relative to the torque and power of the motor with the rotor core and the two ends of the stator core being flush; in addition, the first part and the second part of the magnetizer form an accommodating cavity, the accommodating cavity can increase the volume of an accommodating space enclosed by the accommodating cavity and the stator assembly, and more components can be accommodated in the accommodating space, such as: the end of the rotor winding can be arranged in the accommodating space, so that the volume of the whole motor is reduced, and the power density of the motor can be improved.

It should be noted that, in order to ensure that the torque and the power of the motor are basically unchanged, the magnetic permeability of the magnetizer is generally greater than that of the rotor core; in addition, in order to enable the end part of the rotor winding to be arranged in the accommodating cavity, the first part of the magnetizer can be provided with a hole for the winding of the rotor winding to pass through; moreover, the first part of the magnetizer may be a plate-shaped structure, the second part may be a ring-shaped structure, and the magnetizer may also be regarded as a cylindrical groove opened on the cylinder, and the bottom surface of the groove may be provided with an opening for the rotating shaft to pass through, and the above-mentioned hole for the winding of the rotor winding to pass through.

In a possible embodiment a first part of the magnetic conductors has a first surface facing the rotor core and a second part of the magnetic conductors has a second surface facing the stator core, the first surface and the second surface being perpendicular, the second surface being parallel to a face of the stator core facing the axis of rotation. The second portion of the magnetizer may guide the magnetic field to generate an axial component, and expand a region where the magnetic field is distributed in an axial direction, so that the generated magnetic flux may radially reach the second end of the stator core after being expanded in the axial direction. Electromagnetic interaction between the stator core and the rotor core is achieved, induced electromotive force and torque are generated, and therefore under the condition that the length of the rotor core along the axial direction of the rotating shaft is small, the torque and the power of the motor can be guaranteed to be basically unchanged relative to the torque and the power of the motor with the rotor core and the two ends of the stator core being flush.

It should be noted that the sum of the lengths of the first part of the magnetizer and the rotor core along the axial direction of the rotating shaft is less than the length of the stator core along the rotating shaft direction of the rotating shaft, so that the volume of the accommodating space enclosed by the accommodating cavity and the stator assembly is larger, and the power density of the motor is improved; the end of the second part of the magnetizer, which is far away from the rotor core, is flush with the second end of the stator core, so that the torque and the power of the motor with the accommodating space are basically unchanged, wherein the end of the second part of the magnetizer, which is far away from the rotor core, is flush with the second end of the stator core, and it can be understood that the end of the second part of the magnetizer, which is far away from the rotor core, is approximately flush with the second end of the stator core, that is, one end of the second part of the magnetizer, which is far away from the rotor core, and one end of the second end of the stator core protrude out of the other end, or one end of the second part of the magnetizer, which is far away from the rotor core, is completely flush with the second end of the stator core in the axial direction. Similarly, the first end of the rotor core is flush with the first end of the stator core, which is understood to mean that the first end of the rotor core is substantially flush with the first end of the stator core, i.e. the first end of the rotor core and the first end of the stator core protrude from each other, or the first end of the rotor core and the first end of the stator core are completely flush in the axial direction.

In a possible embodiment, the motor may further include an insulating frame, the insulating frame is disposed in the accommodating space, and the insulating frame is connected to a side of the magnetizer away from the second end of the rotor core. The insulating framework can separate the rotor winding from the magnetizer to insulate the rotor winding from the magnetizer, and can prevent the rotor winding from contacting other parts, so that the working stability of the rotor winding is ensured.

It should be noted that the rotor winding and the magnetic conductor located in the accommodating space may be arranged at intervals, or other insulating materials may be arranged between the rotor and the magnetic conductor located in the accommodating space.

In the above embodiment, the motor may further include an end plate, the end plate is sleeved on the rotating shaft, the end plate is disposed in the accommodating space, one side of the end plate, which is away from the rotating shaft, is connected to the insulating framework, so as to divide the accommodating space into a first accommodating cavity and a second accommodating cavity, the first accommodating cavity is used for disposing an end of the rotor winding, and the second accommodating cavity may accommodate the slip ring or the wireless excitation module rotor and the wireless excitation module stator.

When the second holds and is provided with the sliding ring in the chamber, the motor still includes carbon brush and brush yoke, and wherein, brush yoke and sliding ring all overlap and establish in the pivot, have the clearance between brush yoke and the pivot, and the sliding ring setting is held in the second, and the brush yoke is located the sliding ring and keeps away from one side of rotor core, and is connected between sliding ring and the pivot, and the sliding ring rotates along with the pivot promptly, and the one end and the brush yoke of carbon brush are connected, and the other end and the sliding ring of carbon brush are connected. In this way, the slip ring is arranged in the second accommodating cavity, so that the volume of the motor can be reduced, and the power density of the motor can be increased.

It should be noted that the brush holder may be disposed outside the stator winding, or the brush holder may be disposed in the second receiving cavity.

When the second accommodating cavity is provided with the wireless excitation module rotor and the wireless excitation module stator, a flexible circuit board can be further arranged in the accommodating space, and the flexible circuit board is connected with the rotor winding and the wireless excitation module rotor so as to convert the electric energy collected by the wireless excitation module rotor into the electric energy required by the rotor winding. The wireless excitation module rotor and the wireless excitation module stator can be arranged along the axial direction of the rotating shaft, or the wireless excitation module rotor and the wireless excitation module stator can be arranged along the radial direction of the rotating shaft. Wherein, wireless excitation module rotor is connected with the pivot, there is the clearance between wireless excitation module stator and the wireless excitation module rotor, wireless excitation module stator and wireless excitation module rotor all set up in the second holds the chamber, so that the setting of excitation device in the motor is inseparabler, it is less to make the excitation device occupy the space in the motor, and in this kind of mode, the axial direction of wireless excitation module rotor and wireless excitation module stator is closer with stator winding's distance, thereby can reduce the volume of motor, increase motor power density.

In the above embodiment, in order to improve the working stability of the motor, the motor may further include a sheath, and the sheath is disposed between the insulating frame and the inner wall of the stator winding, that is, the sheath is disposed on a side of the insulating frame and the magnetizer away from the rotating shaft, and more specifically, the sheath may be in interference fit with the insulating frame and the magnetizer.

When being provided with rotor core in the stator winding, need have the interval of setting for between rotor core and the stator core, just can guarantee the normal work of motor, there is first clearance between rotor core and the stator core promptly, and in order to make the magnetizer set up behind the holding chamber, the moment of torsion and the power of motor are unchangeable basically, the second part of magnetizer also needs the interval of setting for between one side towards the stator core and the stator core, there is the second clearance between the second part of magnetizer and the stator core promptly, along the radial direction of pivot, the width of second clearance and first clearance is the same.

In a second aspect, the present application further provides a power assembly, which may include a transmission mechanism and the motor in any of the above technical solutions, wherein the transmission mechanism may be in transmission connection with the rotating shaft. The size of the power assembly with the motor is reduced due to the reduction of the size of the motor, and the flexibility of the power assembly arrangement is further increased.

In a third aspect, the present application further provides a vehicle that may include the powertrain of the second aspect.

Drawings

Fig. 1 is a schematic structural diagram of an electric machine provided in an embodiment of the present application;

FIG. 2 is a partial schematic view of FIG. 1;

fig. 3 is a schematic structural diagram of a motor provided in an embodiment of the present application;

fig. 4 is a schematic structural diagram of a motor provided in an embodiment of the present application;

fig. 5 is a schematic structural diagram of a motor according to an embodiment of the present application.

Reference numerals are as follows: 10-a rotating shaft; 20-a stator assembly; 21-a stator winding; 22-a stator core; 30-a rotor assembly; 31-a rotor winding; 32-a rotor core; 40-a magnetizer; 41-a first part; 42-a second portion; 50-a containment space; 51-a first receiving cavity; 52-a second receiving chamber; 60-an insulating framework; 70-an end plate; 80-slip rings; 90-carbon brush; 100-a brush holder; 110-a wireless excitation module stator; 120-wireless excitation module rotor; 130-a flexible circuit board; 140-sheath.

Detailed Description

In order to make the objects, technical solutions and advantages of the present application more clear, the present application will be further described in detail with reference to the accompanying drawings.

In the prior art, the high power density of an electrically excited synchronous motor is paid more and more attention, and compared with a permanent magnet synchronous motor, a winding is wound on a rotor of the electrically excited synchronous motor, and an excitation device is required to electrify the winding; generally, the excitation device is generally disposed at an end of the motor, and the excitation device may be a brush and slip ring module or a wireless excitation module, wherein stators of the brush and the wireless excitation module are coupled with a casing of the motor, and rotors of the slip ring and the wireless excitation module are coupled with a rotor of the motor. And the existence of the excitation device occupies the space at the end part of the motor, thereby reducing the power density of the motor.

To this end, the present application provides a novel motor to solve the above-mentioned problems.

The terminology used in the following examples is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used in the specification of the present application and the appended claims, the singular forms "a", "an", "the" and "the" are intended to include the plural forms as well, such as "one or more", unless the context clearly indicates otherwise.

Reference throughout this specification to "one embodiment" or "some embodiments," or the like, means that a particular feature, structure, or characteristic described in connection with the embodiment is included in one or more embodiments of the present application. Thus, appearances of the phrases "in one embodiment," "in some embodiments," "in other embodiments," or the like, in various places throughout this specification are not necessarily all referring to the same embodiment, but rather "one or more but not all embodiments" unless specifically stated otherwise. The terms "comprising," "including," "having," and variations thereof mean "including, but not limited to," unless expressly specified otherwise.

Referring to fig. 1 and 2, the present application provides an electric machine, a first end of a stator core 22 indicated by a and a first end of a rotor core 32 indicated by b in fig. 1, comprising a rotating shaft 10, a stator assembly 20 and a rotor assembly 30; the stator assembly 20 includes a stator winding 21 and a stator core 22, the stator winding 21 is disposed on the stator core 22, and the stator winding 21 and the stator core 22 are both sleeved on the rotating shaft 10, the rotor assembly 30 includes a rotor winding 31, a rotor core 32, and a magnetizer 40, the rotor core 32 and the rotor winding 31 are both sleeved on the rotating shaft 10, and the rotor core 32 is located in the stator core 22, wherein the rotor core 32 includes a first end perpendicular to the rotating shaft 10 and a second end opposite to the first end, the stator core 22 includes a first end perpendicular to the rotating shaft 10 and a second end opposite to the first end, the first end of the rotor core 32 is flush with the first end of the stator core 22, the magnetizer 40 is disposed at the second end of the rotor core 32, one end of the magnetizer 40 far from the rotor core 32 is flush with the second end of the stator core 22, the magnetizer 40 may include a first portion 41 and a second portion 42, the rotating shaft 10 passes through the first portion 41, the first portion 41 extends along a radial direction of the rotating shaft 10, the second portion 42 extends along an axial direction of the rotating shaft 10, and one end of the second portion 41 is located in a connecting space of the rotor core 10, and an end portion 50 is located away from an opening of the rotor core accommodating cavity for accommodating the rotor winding 20; specifically, the first portion 41 of the magnetic conductor 40 is configured to conduct the generated magnetic flux to the second portion 42 in the radial direction, the second portion 42 extends in the axial direction, the second portion 42 can guide the magnetic field to generate an axial component, and expand a region where the magnetic field is distributed in the axial direction, and the second portion 42 can conduct the magnetic flux conducted by the first portion 41 to the second end of the stator core 22 in the axial direction, so that electromagnetic interaction between the stator core 22 and the rotor core 32 is realized, and induced electromotive force and torque are generated, and thus, under the condition that the length of the rotor core 32 in the axial direction of the rotating shaft 10 is small, torque and power of the motor can be ensured to be substantially unchanged. In addition, the first portion 41 and the second portion 42 form an accommodating cavity with an opening facing away from the rotor core 32, and the accommodating cavity is arranged to increase the volume of an accommodating space 50 defined by the accommodating cavity and the stator assembly 20, so that more components can be accommodated in the accommodating space 50, such as: the end of the rotor winding 31 can be disposed in the accommodation space, so that the volume of the entire motor can be reduced and the power density of the motor can be increased.

It should be noted that the first portion 41 and the second portion 42 may be formed by integral molding, and the first portion 41 may be provided with a hole for passing the winding of the rotor winding 31 therethrough, so that the end of the rotor winding 31 may be disposed in the receiving space. In addition, the magnetizer 40 may be regarded as a cylindrical groove opened on the cylinder, and an opening for the shaft 10 to pass through and the above-mentioned hole for the winding of the rotor winding 31 to pass through may be provided on the bottom surface of the groove.

When the rotor core 32 is disposed in the stator winding 21, a set gap needs to be provided between the rotor core 32 and the stator core 22 to ensure normal operation of the motor, that is, a first gap exists between the rotor core 32 and the stator core 22, and in order to keep torque and power of the motor unchanged after the magnetizer 40 is disposed in the accommodating cavity, a set gap also needs to be provided between one side of the second portion 42 of the magnetizer 40 facing the stator core 22 and the stator core 22, that is, a second gap exists between a second surface of the second portion 42 of the magnetizer 40 and the stator core 22, and the width of the second gap is the same as that of the first gap along the radial direction of the rotating shaft 10, so that the magnetizer 40 and the rotor core 32 can be regarded as a whole and operate normally.

With continued reference to fig. 2, when specifically arranging first portion 41 and second portion 42 of magnetizer 40, first portion 41 has a first surface facing rotor core 32, the first surface is parallel to a plane where a second end of rotor core 32 is located, the second portion has a second surface facing stator core 22, the first surface and the second surface are perpendicularly connected, the second surface is parallel to a plane of stator core 22 facing the rotation axis, and an end of second portion 42 away from rotor core 32 is parallel to a second end of stator core 22. Thus, the torque and the power of the motor can be basically unchanged relative to the torque and the power of the motor with the rotor core and the two ends of the stator core being flush.

Specifically, when the first portion 41 and the second portion 42 are provided, a surface of the first portion 41 remote from the rotor core 32 (an inner side of the first portion) may not be parallel to the first surface of the first portion 41, similarly, a surface of the second portion 42 remote from the stator core 22 (an inner side of the second portion 42) may not be parallel to the second surface of the second portion 42, and a joint between the inner side of the first portion 41 and the inner side of the second portion 42 may be rounded or may be a right angle.

It should be noted that the sum of the lengths of the first portion 41 of the magnetizer 40 and the rotor core 32 along the axial direction of the rotating shaft 10 is smaller than the length of the stator core 22 along the axial direction of the rotating shaft, so that the volume of the accommodating space enclosed by the accommodating cavity and the stator assembly 20 is larger, and the power density of the motor is improved; in order to ensure that the torque and power of the electric machine are substantially constant, the end of the second portion 42 of the magnetic conductor 40 remote from the rotor core 32 is flush with the second end of the stator core 22; the end of the second portion 42 of the magnetic conductor 40 remote from the rotor core 32 is flush with the second end of the stator core 22, and the first end of the rotor core 32 is flush with the first end of the stator core 22, where the end of the second portion 42 of the magnetic conductor 40 remote from the rotor core 32 is flush with the second end of the stator core 22, and the first end of the rotor core 32 is flush with the first end of the stator core 22, it is understood that the first end of the rotor core 32 is substantially flush with the first end of the stator core 22, i.e. the first end of the rotor core 32 and the first end of the stator core 22 may protrude from each other, or the first end of the rotor core 32 and the first end of the stator core 22 are completely flush; similarly, the end of the second portion 42 of the magnetic conductor 40 remote from the rotor core 32 and the second end of the stator core 22 may also be understood as being substantially flush, i.e. the end of the second portion 42 remote from the rotor core 32 and the second end of the stator core 22 protrude from each other, or the end of the second portion 42 remote from the rotor core 32 and the second end of the stator core 22 are completely flush.

Referring to fig. 3, in order to ensure the operational stability of the end portion of the rotor winding 31 in the accommodating space 50 and prevent the end portion of the rotor winding 31 from contacting other components (e.g., the stator winding 21) during operation, the motor may further include an insulating bobbin 60, the insulating bobbin 60 is disposed in the accommodating space 50, and the insulating bobbin 60 is connected to a side of the magnetic conductor 40 away from the second end of the rotor core 32 to insulate the end portion of the rotor winding 31 from the stator winding 21 and the magnetic conductor 40.

It should be noted that the end of the rotor winding 31 and the magnetizer 40 may be disposed at intervals, or other insulating materials may be disposed between the end of the rotor winding 31 and the magnetizer 40.

The motor can be further provided with an end plate 70, the end plate 70 can be arranged in the accommodating space 50, the end plate 70 is sleeved on the rotating shaft 10, one end of the rotating shaft 10 far away from the end plate 70 can be connected with the insulating framework 60, the end plate 70 can divide the accommodating space 50 into two parts, the two parts are respectively a first accommodating cavity 51 and a second accommodating cavity 52, the first accommodating cavity 51 is located on one side close to the rotor core 32, the end part of the rotor winding 31 can be arranged in the first accommodating cavity 51, the second accommodating cavity 52 can be used for arranging an excitation device, the excitation device can be arranged in the second accommodating cavity 52, namely, the volume of the whole motor can be reduced, and the power density of the motor is further improved.

It should be noted that, in the direction from the insulating frame 60 to the rotating shaft 10, the end plate 70 may gradually extend to the position where the second end of the rotor core 32 is located, and the shape of the end plate 70 may be various as long as it is ensured that the end portion of the rotor winding 31 can be accommodated in the first accommodating cavity 51, which is not illustrated here. Wherein, the volume of the divided first and

second receiving chambers

51 and 52 can be adjusted by changing the shape of the end plate 70.

Referring to fig. 4, the excitation device may include a slip ring 80, a carbon brush 90, and a brush holder 100, the brush holder 100 and the slip ring 80 may be both sleeved on the rotating shaft, a gap may exist between the brush holder 100 and the rotating shaft, and the slip ring 80 is connected to the rotating shaft, wherein the slip ring 80 may be disposed in the second accommodating cavity 52, the brush holder 100 may be disposed outside the stator winding 21, and the carbon brush 90 connects the brush holder 100 and the slip ring 80. Alternatively, the brush holder 100 may be disposed in the second receiving cavity 52, and the brush holder 100 is located on a side of the slip ring 80 away from the rotor core 32, and the carbon brush 90 connects the brush holder 100 and the slip ring 80. Since the slip ring 80 is disposed in the second receiving cavity 52, the overall size of the motor can be reduced with substantially constant motor torque and power relative to the portion of the excitation device disposed on the motor housing, thereby increasing the power density of the motor.

Referring to fig. 5, the excitation device may further include a wireless excitation module rotor 120 and a wireless excitation module stator 110, the wireless excitation module rotor 120 and the wireless excitation module stator 110 may both be disposed in the second accommodating cavity 52, the wireless excitation module stator 110 and the wireless excitation module rotor 120 are both sleeved on the rotating shaft, and the wireless excitation module rotor 120 may be disposed along the axial direction of the rotating shaft 10 or along the radial direction of the rotating shaft 10, wherein the wireless excitation module rotor 120 is connected to the rotating shaft 10, and a gap exists between the wireless excitation module stator 110 and the wireless excitation module rotor 120, so that the wireless excitation module stator 110 is also disposed in the second accommodating cavity 52 along with the disposition manner of the wireless excitation module rotor 120; when the wireless excitation module rotor 120 and the wireless excitation module stator 110 are arranged, the excitation device further includes a flexible circuit board 130, the flexible circuit board 130 is arranged in the accommodating space, and the flexible circuit board 130 is connected with the rotor winding 31 and the wireless excitation module rotor 120 so as to convert the electric energy collected by the wireless excitation module rotor 120 into the form of the electric energy required by the rotor winding 31. In this kind of mode of setting, wireless excitation module stator 110 and wireless excitation module rotor 120 among the excitation device all set up in second holds the chamber 52 to make the setting of excitation device in the motor tighter, make the excitation device occupy the space in the motor less, and set up on the motor casing for wireless excitation module stator 110, the distance of the axial direction of wireless excitation module rotor 120 and wireless excitation module stator 110 and stator winding 21 is closer, and then can reduce the volume of motor, increase motor power density.

In the above embodiment, a sheath may be further disposed between the insulating frame 60 and the inner wall of the stator winding 21, that is, the sheath 140 is disposed on a side of the insulating frame 60 and the magnetizer 40 away from the rotating shaft 10, and more specifically, the sheath 140 may be in interference fit with the insulating frame 60 and the magnetizer 40, and the disposition of the sheath may improve the stability of the motor operation.

In the above-described embodiment, the shaft 10 is provided with the first shoulder and the second shoulder along the axial direction of the shaft 10, and the stator winding 21 is disposed between the first shoulder and the second shoulder.

The application also provides a power assembly, which can comprise a transmission mechanism and the motor in any technical scheme, wherein the transmission mechanism can be in transmission connection with the rotating shaft. The size of the power assembly with the motor is reduced due to the reduction of the size of the motor, and the flexibility of the power assembly arrangement is further improved.

The present application further provides a vehicle that may include the powertrain described above.

The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily think of the changes or substitutions within the technical scope of the present application, and shall be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. An electric machine, comprising:

a rotating shaft;

the stator assembly is sleeved on the rotating shaft and comprises a stator winding and a stator core, and the stator winding is arranged on the stator core;

the rotor assembly is sleeved on the rotating shaft and comprises a rotor winding, a rotor core and a magnetizer, the rotor core is positioned in the stator core, the rotor core comprises a first end perpendicular to the rotating shaft and a second end opposite to the first end, the stator core comprises a first end perpendicular to the rotating shaft and a second end opposite to the first end, the first end of the rotor core is flush with the first end of the stator core, the magnetizer is arranged at the second end of the rotor core, and one end, far away from the rotor core, of the magnetizer is flush with the second end of the stator core;

the magnetizer comprises a first part and a second part, the rotating shaft penetrates through the first part, the first part extends along the radial direction of the rotating shaft, the second part extends along the axial direction of the rotating shaft, one end, far away from the rotating shaft, of the first part is connected with the second part, the first part and the second part form an accommodating cavity with an opening deviating from the rotor core, and the end part of the rotor winding is located in an accommodating space surrounded by the accommodating cavity and the stator assembly.

2. An electric machine according to claim 1, characterized in that a first part of said magnetic conductors has a first surface facing said rotor core and a second part of said magnetic conductors has a second surface facing said stator core, said first and second surfaces being perpendicular, said second surface being parallel to the face of said stator core facing said axis of rotation.

3. The electric machine according to claim 2, wherein a sum of a length of the first portion of the magnetic conductor and a length of the rotor core in the axial direction of the rotating shaft is smaller than a length of the stator core in the axial direction of the rotating shaft, and an end of the second portion of the magnetic conductor, which is away from the rotor core, is flush with a second end of the stator core.

4. The motor according to any one of claims 1 to 3, further comprising an insulating frame, wherein the insulating frame is located in the accommodating space, the insulating frame is connected to a side of the magnetic conductor away from the second end of the rotor core, and the insulating frame is configured to separate the rotor winding from the magnetic conductor.

5. The motor according to claim 4, further comprising an end plate positioned in the accommodating space, wherein one end of the end plate is connected to the insulating frame, and the other end of the end plate is close to the rotating shaft so as to divide the accommodating space into a first accommodating chamber and a second accommodating chamber, and an end of the rotor winding is disposed in the first accommodating chamber.

6. The motor of claim 5, further comprising a slip ring, a carbon brush, and a brush holder, wherein the brush holder and the slip ring are sleeved on the shaft;

the brush yoke faces one side of the rotating shaft and a gap exists between the rotating shaft, the slip ring faces one side of the rotating shaft and is connected with the rotating shaft, the slip ring is arranged in the second accommodating cavity, the brush yoke is arranged on one side, away from the rotor core, of the slip ring, one end of the carbon brush is connected with the slip ring, and the other end of the carbon brush is connected with the brush yoke.

7. The motor of claim 5, further comprising a wireless excitation module rotor and a wireless excitation module stator disposed in the second accommodating cavity, wherein the wireless excitation module stator and the wireless excitation module rotor are both sleeved on the rotating shaft, and the wireless excitation module stator is located outside the wireless excitation module rotor;

the wireless excitation module rotor is connected with the rotating shaft, and a gap exists between the wireless excitation module stator and the wireless excitation module rotor.

8. The electric machine of claim 7 further comprising a flexible circuit board disposed in the receiving space, the flexible circuit board being connected to the rotor windings and the wireless excitation module rotor.

9. The motor according to any one of claims 4 to 8, further comprising a sheath disposed on a side of the insulating bobbin and the magnetizer away from the rotation shaft.

10. An electric machine according to any of claims 2-9, characterized in that a first gap is present between the rotor core and the stator core, and a second gap is present between the side of the second portion of the flux conductor facing the stator core and the stator core, the first gap and the second gap having the same width in the radial direction.

11. An electric machine according to any of claims 2-10, characterized in that the permeability of the magnetic conductor is greater than the permeability of the rotor core.

12. A drive assembly comprising a drive mechanism and an electric machine as claimed in any one of claims 1 to 11, the drive mechanism being connected to the shaft.

13. A vehicle, characterized by comprising an electric machine according to claim 12.