Motor, powertrain and vehicle

Abstract

The present application relates to the technical field of motors, and specifically relates to a motor, a powertrain and a vehicle. The motor includes a rotating shaft, a stator assembly and a rotor assembly. 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 assembly includes a rotor winding, a rotor core and a magnetic conductor. The rotor core is located inside the stator core. The first end of the rotor core is flush with the first end of the stator core. The magnetic conductor is arranged at the second end of the rotor core. The end of the magnetic conductor away from the rotor core is flush with the second end of the stator core. The magnetic conductor includes a first part and a second part. One end of the first part away from the rotating shaft is connected to the second part. The first part and the second part form a receiving cavity with an opening facing away from the rotor core. The end of the rotor winding is located in the receiving space formed by the receiving cavity and the stator assembly. The motor in the present application has a relatively high power density.

Description

Technical Field

[0001] The present application relates to the field of motor technology, and in particular to a motor, a powertrain and a vehicle. Background Art

[0002] With the development of technology in the electric vehicle industry and the improvement of market requirements, the drive motors of electric vehicles are moving towards higher power density. Higher power density drive motors use less raw materials, reduce costs, and enable more flexible layout of the powertrain in the vehicle.

[0003] Therefore, how to improve the power density of the motor has become an urgent problem to be solved. Summary of the invention

[0004] The present application provides an electric motor, a powertrain and a vehicle, wherein the electric motor has a high power density.

[0005] In a first aspect, the present application provides a motor, which includes 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 assembly includes a rotor winding, a rotor core and a magnetic conductor, and the rotor core is located in the stator core, wherein the rotor core includes a first end perpendicular to the rotating shaft and a second end opposite to the first end, and the stator core includes a first end perpendicular to the rotating shaft and a second end opposite to the first end, wherein the first end of the rotor core is parallel to the first end of the stator core The magnetizer is arranged at the second end of the rotor core, and the end of the magnetizer away from the rotor core is flush with the second end of the stator core, wherein the magnetizer includes a first part and a second part, the shaft passes through the first part, the first part extends in the radial direction of the shaft, the second part is connected to the end of the first part away from the shaft, and the second part extends along the axial direction of the shaft to the side away from the rotor core, the first part and the second part can form a accommodating cavity, the opening of the accommodating cavity is located on the side away from the rotor core, and the end of the rotor winding is arranged in the accommodating space surrounded by the accommodating cavity and the stator assembly. Specifically, the magnetizer is arranged at the second end of the rotor core, and the magnetizer can conduct the magnetic flux generated by the rotor winding to the second end of the stator core, thereby realizing electromagnetic interaction between the stator core and the rotor core, generating induced electromotive force and torque, and ensuring that the torque and power of the motor are basically unchanged relative to the torque and power of the motor whose rotor core and stator core are flush at both ends; in addition, the first part and the second part of the magnetizer form a accommodating cavity, and the setting of the accommodating cavity can increase the volume of the accommodating space surrounded by the accommodating cavity and the stator assembly, so that more components can be accommodated in the accommodating space, such as: the end of the rotor winding can be arranged in the accommodating space, thereby reducing the volume of the entire motor and improving the power density of the motor.

[0006] It should be noted that, in order to ensure that the torque and power of the motor remain basically unchanged, the magnetic permeability of the magnetic conductor is usually greater than that of the rotor core; in addition, in order to enable the end of the rotor winding to be arranged in the accommodating cavity, holes for the winding of the rotor winding to pass through can be arranged on the first part of the magnetic conductor; furthermore, the first part of the magnetic conductor can be a plate-like structure, the second part can be an annular structure, and the magnetic conductor can also be regarded as having a cylindrical groove opened on a cylinder, and an opening for the rotating shaft to pass through can be arranged on the bottom surface of the groove, as well as the above-mentioned holes for the winding of the rotor winding to pass through.

[0007] In a possible embodiment, the first part of the magnetic conductor has a first surface facing the rotor core, the second part of the magnetic conductor has a second surface facing the stator core, the first surface and the second surface are perpendicular, and the second surface is parallel to the surface of the stator core facing the rotating shaft. The second part of the magnetic conductor can guide the magnetic field to generate an axial component, expand the region where the magnetic field is distributed in the axial direction, so that the generated magnetic flux can reach the second end of the stator core radially after expanding axially. To achieve the electromagnetic interaction between the stator core and the rotor core, generate induced electromotive force and torque, so that when the length of the rotor core in the axial direction of the rotating shaft is small, the torque and power of the motor can still be ensured to be basically unchanged compared with those of a motor in which the rotor core and the stator core are flush at both ends.

[0008] It should be noted that the sum of the lengths of the first part of the magnetic conductor and the rotor core in the axial direction of the rotating shaft is less than the length of the stator core in the axial direction of the rotating shaft, so that the volume of the accommodating space formed by the accommodating cavity and the stator assembly is larger, in order to improve the power density of the motor; the end of the second part of the magnetic conductor away from the rotor core is flush with the second end of the stator core, which can ensure that the torque and power of the motor with the above-mentioned accommodating space are basically unchanged. Here, the end of the second part of the magnetic conductor away from the rotor core being flush with the second end of the stator core can be understood as that the end of the second part of the magnetic conductor away from the rotor core is approximately flush with the second end of the stator core, that is, one of the end of the second part of the magnetic conductor away from the rotor core and the second end of the stator core protrudes from the other, or the end of the second part of the magnetic conductor away from the rotor core and the second end of the stator core are completely flush axially. Similarly, the first end of the above-mentioned rotor core being flush with the first end of the stator core can be understood as that the first end of the rotor core is approximately flush with the first end of the stator core, that is, one of the first end of the rotor core and the first end of the stator core protrudes from the other, or the first end of the rotor core and the first end of the stator core are completely flush axially.

[0009] In a possible embodiment, the motor may further include an insulating skeleton disposed in the accommodating space and connected to a side of the magnetic conductor away from the second end of the rotor core. The insulating skeleton can separate the rotor winding from the magnetic conductor to insulate the rotor winding from the magnetic conductor, and can also prevent the rotor winding from contacting other components, ensuring the stability of the rotor winding during operation.

[0010] It should be noted that there may also be a gap between the rotor winding and the magnetic conductor located in the accommodating space, or other insulating materials may be provided between the rotor and the magnetic conductor located in the accommodating space.

[0011] In the above embodiment, the motor may further include an end plate sleeved on the rotating shaft and disposed in the accommodating space. The side of the end plate away from the rotating shaft is connected to the insulating skeleton to divide the accommodating space into a first accommodating cavity and a second accommodating cavity. The first accommodating cavity is used to arrange the ends of the rotor winding, and the second accommodating cavity can accommodate a slip ring or a wireless excitation module rotor and a wireless excitation module stator.

[0012] When a slip ring is provided in the second accommodating cavity, the motor further includes a carbon brush and a brush holder. The brush holder and the slip ring are both sleeved on the rotating shaft, and there is a gap between the brush holder and the rotating shaft. The slip ring is disposed in the second accommodating cavity, and the brush holder is located on the side of the slip ring away from the rotor core. The slip ring is connected to the rotating shaft, that is, the slip ring rotates with the rotating shaft. One end of the carbon brush is connected to the brush holder, and the other end of the carbon brush is connected to the slip ring. In this way, the slip ring is arranged in the second accommodating cavity, which can reduce the volume of the motor and increase the power density of the motor.

[0013] It should be noted that the brush holder can be specifically arranged outside the stator winding, or the brush holder can be arranged in the second accommodating cavity.

[0014] When a wireless excitation module rotor and a wireless excitation module stator are provided in the second accommodating cavity, a flexible circuit board can also be arranged in the accommodating space. The flexible circuit board is connected to the rotor winding and the wireless excitation module rotor to convert the electric energy collected by the wireless excitation module rotor into the form of 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. The wireless excitation module rotor is connected to the rotating shaft, and there is a gap between the wireless excitation module stator and the wireless excitation module rotor. The wireless excitation module stator and the wireless excitation module rotor are both arranged in the second accommodating cavity, making the arrangement of the excitation device in the motor more compact, occupying less space in the motor. Moreover, in this way, the axial direction of the wireless excitation module rotor and the wireless excitation module stator is closer to the stator winding, which can reduce the volume of the motor and increase the power density of the motor.

[0015] In the above embodiments, in order to improve the stability of the motor operation, the motor may further include a sheath, which is disposed between the inner wall of the insulating skeleton and the stator winding, that is, the sheath is disposed on the side of the insulating skeleton and the magnetic conductor away from the rotating shaft. More specifically, the sheath may be in interference fit with the insulating skeleton and the magnetic conductor.

[0016] When a rotor core is disposed in the stator winding, a set distance needs to be provided between the rotor core and the stator core to ensure the normal operation of the motor, that is, a first gap exists between the rotor core and the stator core. In order to ensure that the torque and power of the motor remain basically unchanged after the magnetic conductor is disposed in the accommodating cavity, a set distance also needs to be provided between the second part of the magnetic conductor facing the stator core and the stator core, that is, a second gap exists between the second part of the magnetic conductor and the stator core. Along the radial direction of the rotating shaft, the widths of the second gap and the first gap are the same.

[0017] 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, and the transmission mechanism may be in transmission connection with the rotating shaft. The volume of the power assembly having the above motor is reduced due to the reduction of the motor volume, thereby increasing the flexibility of the layout of the power assembly.

[0018] In a third aspect, the present application further provides a vehicle, which may include the power assembly in the second aspect. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a schematic structural diagram of a motor provided by an embodiment of the present application;

[0020] Figure 2 is Figure 1 a partial schematic diagram of;

[0021] Figure 3 is another schematic structural diagram of a motor provided by an embodiment of the present application;

[0022] Figure 4 is another schematic structural diagram of a motor provided by an embodiment of the present application;

[0023] Figure 5 is another schematic structural diagram of a motor provided by an embodiment of the present application.

[0024] Reference numerals: 10 - rotating shaft; 20 - stator assembly; 21 - stator winding; 22 - stator core; 30 - rotor assembly; 31 - rotor winding; 32 - rotor core; 40 - magnetic conductor; 41 - first part; 42 - second part; 50 - accommodation space; 51 - first accommodation cavity; 52 - second accommodation cavity; 60 - insulating skeleton; 70 - end plate; 80 - slip ring; 90 - carbon brush; 100 - brush holder; 110 - stator of wireless excitation module; 120 - rotor of wireless excitation module; 130 - flexible circuit board; 140 - sheath. Detailed implementation manners

[0025] In order to make the purpose, technical solutions and advantages of the present application clearer, the present application will be further described in detail below with reference to the accompanying drawings.

[0026] In the prior art, the high power density of the electric excitation synchronous motor has received increasing attention. Compared with the permanent magnet synchronous motor, a winding is wound on the rotor of the electric excitation motor, and an excitation device is required to energize the winding; generally, the excitation device is generally arranged at the end of the motor, and the excitation device can be a brush and slip ring module, or a wireless excitation module. Among them, the stator of the brush and the wireless excitation module is connected to the motor housing, and the rotor of the slip ring and the wireless excitation module is connected to the motor rotor. As a result, the presence of the excitation device will occupy the space at the end of the motor, reducing the power density of the motor.

[0027] Therefore, the present application provides a new type of motor to solve the above problems.

[0028] The terms used in the following embodiments are only for the purpose of describing specific embodiments and are not intended to limit the present application. As used in the specification and appended claims of the present application, the singular forms "a", "an", "the above", "the" and "this" are also intended to include the forms such as "one or more", unless clearly indicated to the contrary in the context.

[0029] Reference to "one embodiment" or "some embodiments" etc. described in this specification means that specific features, structures or characteristics described in connection with the embodiment are included in one or more embodiments of the present application. Thus, the phrases "in one embodiment", "in some embodiments", "in other some embodiments", "in still other embodiments" etc. that appear in different places in this specification do not necessarily refer to the same embodiment, but mean "one or more but not all embodiments", unless otherwise specifically emphasized in other ways. The terms "comprising", "including", "having" and their variants all mean "including but not limited to", unless otherwise specifically emphasized in other ways.

[0030] Refer to Figure 1 andFigure 2 , this application provides a motor, Figure 1 For the first end of the stator core 22 referred to by a and the first end of the rotor core 32 referred to by b, the motor includes 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 arranged on the stator core 22, and both the stator winding 21 and the stator core 22 are sleeved on the rotating shaft 10, the rotor assembly 30 includes a rotor winding 31, a rotor core 32 and a magnetic conductor 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 inside the stator core 22. Among them, 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 magnetic conductor 40 is arranged at the second end of the rotor core 32, and the end of the magnetic conductor 40 away from the rotor core 32 is flush with the second end of the stator core 22. The magnetic conductor 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 in the radial direction of the rotating shaft 10, the second portion 42 extends in the axial direction of the rotating shaft 10, and the second portion 41 is connected to the end of the first portion 41 away from the rotating shaft 10. The first portion 41 and the second portion 42 form a receiving cavity with an opening facing away from the rotor core 32, and the end of the rotor winding 31 is located in the receiving space 50 surrounded by the receiving cavity and the stator assembly 20; among them, the magnetic conductor 40 can conduct the magnetic flux generated by the rotor winding 31 to the second end of the stator core 22. Specifically, the first portion 41 of the magnetic conductor 40 is used to conduct the generated magnetic flux in the radial direction to the second portion 42. The second portion 42 extends in the axial direction, and the second portion 42 can guide the magnetic field to generate an axial component, expand the 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 in the axial direction to the second end of the stator core 22, realizing the electromagnetic interaction between the stator core 22 and the rotor core 32, generating an induced electromotive force and torque, so that when the length of the rotor core 32 in the axial direction of the rotating shaft 10 is small, the torque and power of the motor can still be basically unchanged. In addition, the first portion 41 and the second portion 42 form a receiving cavity with an opening facing away from the rotor core 32. The setting of the receiving cavity can increase the volume of the receiving space 50 surrounded by the receiving cavity and the stator assembly 20, so that more components can be accommodated in the receiving space 50. For example, the end of the rotor winding 31 can be arranged in the receiving space, thereby reducing the volume of the entire motor and improving the power density of the motor.

[0031] It should be noted that the first part 41 and the second part 42 can be prepared by integral molding, and holes can be provided on the first part 41 for the winding of the rotor winding 31 to pass through, so that the end of the rotor winding 31 can be arranged in the accommodation space. In addition, the magnetic conductor 40 can be regarded as having a cylindrical groove formed on a cylinder, and an opening for the rotating shaft 10 to pass through can be provided on the bottom surface of the groove, as well as the above-mentioned holes for the winding of the rotor winding 31 to pass through.

[0032] When the rotor core 32 is arranged in the stator winding 21, a set distance needs to be provided between the rotor core 32 and the stator core 22 to ensure the normal operation of the motor, that is, there is a first gap between the rotor core 32 and the stator core 22. In order to ensure that the torque and power of the motor remain basically unchanged after the magnetic conductor 40 is arranged in the accommodation cavity, a set distance also needs to be provided between the side of the second part 42 of the magnetic conductor 40 facing the stator core 22 and the stator core 22, that is, there is a second gap between the second surface of the second part 42 of the magnetic conductor 40 and the stator core 22. Along the radial direction of the rotating shaft 10, the width of the second gap is the same as that of the first gap, so that the magnetic conductor 40 and the rotor core 32 can be regarded as a whole for normal operation.

[0033] Continue to refer to Figure 2 , when specifically setting the first part 41 and the second part 42 of the magnetic conductor 40, the first part 41 has a first surface facing the rotor core 32, the first surface is parallel to the plane where the second end of the rotor core 32 is located, the second part has a second surface facing the stator core 22, the first surface and the second surface are vertically connected, the second surface is parallel to the surface of the stator core 22 facing the rotating shaft, and the end of the second part 42 away from the rotor core 32 is parallel to the second end of the stator core 22. Only in this way can it be ensured that the torque and power of the motor are basically unchanged compared with those of the motor with the rotor core and the stator core flush at both ends.

[0034] When specifically setting the first part 41 and the second part 42, the surface of the first part 41 away from the rotor core 32 (the inner side of the first part) may not be parallel to the first surface of the first part 41. Similarly, the surface of the second part 42 away from the stator core 22 (the inner side of the second part 42) may not be parallel to the second surface of the second part 42, and the connection between the inner side of the first part 41 and the inner side of the second part 42 can be rounded or right-angled.

[0035] It should be noted that the sum of the lengths of the first part 41 of the magnetic conductor 40 and the rotor core 32 in the axial direction of the rotating shaft 10 is less than the length of the stator core 22 in the axial direction of the rotating shaft, so as to make the volume of the accommodation space formed by the accommodation cavity and the stator assembly 20 larger, thereby improving the power density of the motor. To ensure that the torque and power of the motor remain basically unchanged, the end of the second part 42 of the magnetic conductor 40 away from the rotor core 32 is flush with the second end of the stator core 22. The following explains that the end of the second part 42 of the magnetic conductor 40 away 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. Here, the statement that the end of the second part 42 of the magnetic conductor 40 away 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 can be understood as that the first end of the rotor core 32 is approximately flush with the first end of the stator core 22, that is, one of the first end of the rotor core 32 and the first end of the stator core 22 can protrude from the 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 part 42 of the magnetic conductor 40 away from the rotor core 32 and the second end of the stator core 22 can also be understood as approximately flush, that is, one of the end of the second part 42 away from the rotor core 32 and the second end of the stator core 22 protrudes from the other, or the end of the second part 42 away from the rotor core 32 and the second end of the stator core 22 are completely flush.

[0036] Referring to Figure 3 , to ensure the stability of the end of the rotor winding 31 during operation in the accommodation space 50 and prevent the end of the rotor winding 31 from contacting other components (such as the stator winding 21) during operation, the motor may further include an insulating skeleton 60. The insulating skeleton 60 is disposed in the accommodation space 50 and is connected to the side of the magnetic conductor 40 away from the second end of the rotor core 32 to insulate the end of the rotor winding 31 from the stator winding 21 and the magnetic conductor 40.

[0037] It should be noted that there may also be a gap between the end of the rotor winding 31 and the magnetic conductor 40, or other insulating materials may be provided between the end of the rotor winding 31 and the magnetic conductor 40.

[0038] An end plate 70 can also be provided in the motor. The end plate 70 can be arranged in the accommodation space 50 and sleeved on the rotating shaft 10. One end of the end plate 70 away from the rotating shaft 10 can be connected to the insulating skeleton 60. The end plate 70 can divide the accommodation space 50 into two parts, namely a first accommodation cavity 51 and a second accommodation cavity 52. The first accommodation cavity 51 is located on the side close to the rotor core 32, and the end of the rotor winding 31 can be arranged in the first accommodation cavity 51. The second accommodation cavity 52 can be used to arrange the exciting device. Since the exciting device can be arranged in the second accommodation cavity 52, the volume of the whole motor can be reduced, and thus the power density of the motor can be improved.

[0039] It should be noted that in the direction from the insulating skeleton 60 to the rotating shaft 10, the end plate 70 can gradually extend towards the position where the second end of the rotor core 32 is located. As long as the end of the rotor winding 31 can be accommodated in the first accommodation cavity 51, the shape of the end plate 70 can be various and will not be listed here. Among them, by changing the shape of the end plate 70, the volumes of the separated first accommodation cavity 51 and second accommodation cavity 52 can be adjusted.

[0040] Refer to Figure 4 , the exciting device can include a slip ring 80, a carbon brush 90 and a brush holder 100. The brush holder 100 and the slip ring 80 can both be sleeved on the rotating shaft, and there is a gap between the brush holder 100 and the rotating shaft. The slip ring 80 is connected to the rotating shaft. Among them, the slip ring 80 can be arranged in the second accommodation cavity 52, and the brush holder 100 can be arranged outside the stator winding 21, and the carbon brush 90 connects the brush holder 100 and the slip ring 80. Or, the brush holder 100 can also be arranged in the second accommodation cavity 52, and the brush holder 100 is located on the 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 arranged in the second accommodation cavity 52, compared with the situation where part of the exciting device is arranged on the motor housing, when the motor torque and power are basically unchanged, the overall size of the motor will be reduced, thereby improving the power density of the motor.

[0041] Refer to Figure 5, the exciting device may further include a wireless exciting module rotor 120 and a wireless exciting module stator 110. The wireless exciting module rotor 120 and the wireless exciting module stator 110 may both be disposed in the second receiving cavity 52. The wireless exciting module stator 110 and the wireless exciting module rotor 120 are both sleeved on the rotating shaft, and the wireless exciting module rotor 120 may be arranged along the axial direction of the rotating shaft 10 or along the radial direction of the rotating shaft 10. Among them, the wireless exciting module rotor 120 is connected to the rotating shaft 10, and there is a gap between the wireless exciting module stator 110 and the wireless exciting module rotor 120. In this way, the wireless exciting module stator 110 is also disposed in the second receiving cavity 52 according to the arrangement mode of the wireless exciting module rotor 120; when the wireless exciting module rotor 120 and the wireless exciting module stator 110 are arranged, the exciting device further needs to include a flexible circuit board 130. The flexible circuit board 130 is disposed in the receiving space, and the flexible circuit board 130 is connected to the rotor winding 31 and the wireless exciting module rotor 120 to convert the electric energy collected by the wireless exciting module rotor 120 into the form of electric energy required by the rotor winding 31. In this setting mode, both the wireless exciting module stator 110 and the wireless exciting module rotor 120 in the exciting device are disposed in the second receiving cavity 52, so that the setting of the exciting device in the motor is more compact, the space occupied by the exciting device in the motor is smaller, and compared with the wireless exciting module stator 110 disposed on the motor housing, the axial direction of the wireless exciting module rotor 120 and the wireless exciting module stator 110 is closer to the stator winding 21, thereby reducing the volume of the motor and increasing the power density of the motor.

[0042] In the above embodiment, a sheath may further be disposed between the inner wall of the insulating skeleton 60 and the stator winding 21, that is, the sheath 140 is disposed on the side of the insulating skeleton 60 and the magnetic conductor 40 away from the rotating shaft 10. More specifically, the sheath 140 may be in interference fit with the insulating skeleton 60 and the magnetic conductor 40. The setting of the sheath can improve the working stability of the motor.

[0043] In the above embodiment, along the axial direction of the rotating shaft 10, a first shoulder and a second shoulder are provided on the rotating shaft 10, and the stator winding 21 is disposed between the first shoulder and the second shoulder.

[0044] The present application also provides a power assembly, which may include a transmission mechanism and the motor in any of the above technical solutions. The transmission mechanism may be in transmission connection with the rotating shaft. The volume of the power assembly having the above motor is reduced due to the reduction of the motor volume, thereby increasing the flexibility of the power assembly layout.

[0045] The present application also provides a vehicle, which may include the above power assembly.

[0046] The above is only the specific implementation manner of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present application can easily think of changes or substitutions, which should all be covered within the protection 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. A motor, characterized in that, comprising: a rotating shaft; a stator assembly sleeved on the rotating shaft, the stator assembly including a stator winding and a stator core, and the stator winding being arranged on the stator core; a rotor assembly sleeved on the rotating shaft, the rotor assembly including a rotor winding, a rotor core and a magnetic conductor, the rotor core being located inside the stator core, the rotor core including a first end perpendicular to the rotating shaft and a second end opposite to the first end, the stator core including a first end perpendicular to the rotating shaft and a second end opposite to the first end, wherein the first end of the rotor core is flush with the first end of the stator core, the magnetic conductor is arranged at the second end of the rotor core, and one end of the magnetic conductor away from the rotor core is flush with the second end of the stator core; wherein, the magnetic conductor includes a first part and a second part, the rotating shaft passes through the first part, the first part extends in the radial direction of the rotating shaft, the second part extends in the axial direction of the rotating shaft, and one end of the first part away from the rotating shaft is connected to the second part, the first part and the second part form a receiving cavity with an opening facing away from the rotor core, and the end of the rotor winding is located in the receiving space surrounded by the receiving cavity and the stator assembly; the sum of the lengths of the first part of the magnetic conductor and the rotor core in the axial direction of the rotating shaft is less than the length of the stator core in the axial direction of the rotating shaft, and one end of the second part of the magnetic conductor away from the rotor core is flush with the second end of the stator core.

2. The motor according to claim 1, characterized in that, the first part of the magnetic conductor has a first surface facing the rotor core, the second part of the magnetic conductor has a second surface facing the stator core, the first surface and the second surface are perpendicular, and the second surface is parallel to the surface of the stator core facing the rotating shaft.

3. The motor according to claim 1, characterized in that, the motor further includes an insulating skeleton located in the receiving space, and the insulating skeleton is connected to one side of the second end of the magnetic conductor away from the rotor core, and the insulating skeleton is used for separating the rotor winding from the magnetic conductor.

4. The motor according to claim 3, characterized in that, the motor further includes an end plate located in the receiving space, one end of the end plate is connected to the insulating skeleton, and the other end of the end plate is close to the rotating shaft to divide the receiving space into a first receiving cavity and a second receiving cavity, and the end of the rotor winding is arranged in the first receiving cavity.

5. The motor according to claim 4, characterized in that, the motor further includes a slip ring, a carbon brush and a brush holder, and both the brush holder and the slip ring are sleeved on the rotating shaft; There is a gap between one side of the brush holder facing the rotating shaft and the rotating shaft. One side of the slip ring facing the rotating shaft is connected to the rotating shaft. The slip ring is arranged in the second accommodation cavity. The brush holder is arranged on the side of the slip ring away from the rotor core. One end of the carbon brush is connected to the slip ring, and the other end of the carbon brush is connected to the brush holder.

6. The motor according to claim 4, characterized in that the motor further includes a wireless excitation module rotor and a wireless excitation module stator arranged in the second accommodation cavity. Both the wireless excitation module stator and the wireless excitation module rotor are sleeved on the rotating shaft, and the wireless excitation module stator is located outside the wireless excitation module rotor; wherein, the wireless excitation module rotor is connected to the rotating shaft, and there is a gap between the wireless excitation module stator and the wireless excitation module rotor.

7. The motor according to claim 6, characterized in that the motor further includes a flexible circuit board arranged in the accommodation space. The flexible circuit board is connected to the rotor winding and the wireless excitation module rotor.

8. The motor according to any one of claims 3 to 7, characterized in that it further includes a sheath, and the sheath is arranged on the side of the insulating skeleton and the magnetic conductor away from the rotating shaft.

9. The motor according to any one of claims 3 to 7, characterized in that there is a first gap between the rotor core and the stator core, and there is a second gap between one side of the second part of the magnetic conductor facing the stator core and the stator core. The widths of the first gap and the second gap in the radial direction are the same.

10. The motor according to any one of claims 3 to 7, characterized in that the magnetic permeability of the magnetic conductor is greater than the magnetic permeability of the rotor core.

11. A powertrain, characterized in that it includes a transmission mechanism and the motor according to any one of claims 1 to 10, and the transmission mechanism is connected to the rotating shaft.

12. A vehicle, characterized in that it includes the powertrain according to claim 11.

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