Motor, power assembly and vehicle

Abstract

The utility model discloses a motor, a power assembly and a vehicle, and the motor comprises a housing which is internally provided with a first inner cavity; the rotor shaft is arranged in the first inner cavity, and the first end of the rotor shaft extends out of the first inner cavity; the electric brush structure is arranged outside the first inner cavity and is used for conducting electricity to the first end of the rotor shaft; the rotating speed monitor is arranged in the first inner cavity and used for monitoring the rotating speed of the rotor shaft. Therefore, the rotating speed monitor and the electric brush structure can be separated, and the distance between the rotating speed monitor and the electric brush structure is long, so that the interference of a high-voltage wire harness of the electric brush structure on a low-voltage wire harness of the rotating speed monitor can be avoided, and the influence of high-voltage electromagnetic interference on the measurement precision of the rotating speed monitor during power supply of the electric brush structure can also be reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of motors, in particular to a motor, a power assembly and a vehicle. Background Art

[0002] In the prior art, the brush structure and the speed monitor in the motor are a complex integrated structure. The brush structure and the speed monitor are integrated into a whole. The brush structure is in a high-voltage working environment, while the speed monitor is in a low-voltage working environment. When the brush structure and the speed monitor are integrated together, the distance between their wiring harnesses is relatively close. The high-voltage wiring harness of the brush structure will interfere with the low-voltage wiring harness of the speed monitor, thereby affecting the measurement accuracy of the speed monitor. Utility Model Content

[0003] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, one purpose of the utility model is to provide a motor that can isolate a speed monitor from a brush structure, with a large distance between the two, thereby avoiding interference of the high-voltage wire harness of the brush structure with the low-voltage wire harness of the speed monitor, and also reducing the influence of high-voltage electromagnetic interference when the brush structure is powered on the measurement accuracy of the speed monitor.

[0004] The utility model further provides a power assembly.

[0005] The utility model also provides a vehicle.

[0006] According to the first aspect of the present invention, the motor includes: a shell having a first inner cavity formed therein; a rotor shaft, the rotor shaft being arranged in the first inner cavity, and the first end of the rotor shaft extending out of the first inner cavity; a brush structure, the brush structure being arranged outside the first inner cavity and used for conducting electricity to the first end of the rotor shaft; and a speed monitor, the speed monitor being arranged in the first inner cavity and used for monitoring the speed of the rotor shaft.

[0007] Therefore, the motor can isolate the speed monitor from the brush structure, and the distance between the two is relatively far, thereby avoiding the interference of the high-voltage wiring harness of the brush structure with the low-voltage wiring harness of the speed monitor, and also reducing the influence of high-voltage electromagnetic interference when the brush structure is powered on the measurement accuracy of the speed monitor.

[0008] According to some embodiments of the present invention, the motor further comprises: a rotor, the rotor being arranged on the rotor shaft and located in the first inner cavity, and the brush structure and the speed monitor being located on the same axial side of the rotor.

[0009] According to some embodiments of the present invention, the motor further comprises: a rotor, which is disposed on the rotor shaft and located in the first inner cavity, and the brush structure and the speed monitor are located on opposite axial sides of the rotor.

[0010] According to some embodiments of the present invention, the speed monitor is a rotary transformer and includes: a rotary transformer stator, which is arranged on the housing; and a rotary transformer rotor, which is arranged on the rotor shaft and located on the inner circumference of the rotary transformer stator.

[0011] According to some embodiments of the present utility model, the rotor shaft is provided with a stop step, and the stop step cooperates with the axial stop of the resolver rotor along the rotor shaft.

[0012] According to some embodiments of the utility model, the shell includes: a main shell, the main shell having an opening; a first end cover, the first end cover is arranged at the opening of the main shell, the main shell and the first end cover together form the first inner cavity, the rotating transformer stator is arranged in the main shell, and the brush structure is located on the side of the first end cover facing away from the first inner cavity.

[0013] According to some embodiments of the utility model, the main shell includes: an outer ring plate, one axial side of the outer ring plate is connected to the first end cover; an end plate, the end plate is located on the other axial side of the outer ring plate and is integrally formed with the outer ring plate, and the rotating stator is arranged on the end plate.

[0014] According to some embodiments of the present invention, an accommodating groove is formed on the end surface of the housing, and the first end of the rotor shaft and the brush structure are arranged in the accommodating groove.

[0015] According to some embodiments of the present invention, the motor further comprises: a cover body, which is disposed on the housing and covers a notch of the accommodating groove.

[0016] According to some embodiments of the present invention, the cover body is screwed to the shell; and / or the cover body is snap-connected to the shell.

[0017] According to some embodiments of the utility model, the brush structure includes: a fixing frame, which is arranged on the shell; a positive brush ring and a negative brush ring, which are arranged on the rotor shaft and are spaced apart along the axial direction of the rotor shaft; a positive brush and a negative brush, which are arranged on the fixing frame and are spaced apart along the axial direction of the fixing frame, the positive brush is in contact with the positive brush ring and the negative brush is in contact with the negative brush ring.

[0018] According to some embodiments of the utility model, there are multiple positive brushes, which are spaced apart in the circumferential direction of the fixing frame; and / or there are multiple negative brushes, which are spaced apart in the circumferential direction of the fixing frame.

[0019] According to some embodiments of the utility model, the shell forms a second inner cavity, the second end of the rotor shaft extends from the first inner cavity to the second inner cavity, and the motor also includes: a transmission shaft, which is arranged in the second inner cavity and connected to the rotor shaft.

[0020] According to some embodiments of the utility model, the shell includes: a main shell, the main shell having an opening; a first end cover, the first end cover is arranged at the opening of the main shell, the main shell and the first end cover jointly form the first inner cavity, the rotary transformer stator is arranged at the main shell, and the brush structure is located on the side of the first end cover facing away from the first inner cavity; a second end cover, the second end cover is arranged at the main shell, the first end cover and the second end cover are respectively located on opposite sides of the main shell, and the second end cover and the main shell jointly form the second inner cavity.

[0021] According to some embodiments of the present invention, transmission teeth are integrally formed on the outer circumference of the transmission shaft.

[0022] The power assembly according to the second embodiment of the utility model includes: the above-mentioned motor.

[0023] A vehicle according to an embodiment of the third aspect of the utility model includes: the above-mentioned power assembly.

[0024] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0026] Figure 1 is a cross-sectional view of a motor according to an embodiment of the utility model;

[0027] Figure 2 is an exploded diagram of a brush structure and a speed monitor according to an embodiment of the utility model;

[0028] Figure 3 It is a schematic diagram of a structure in which a brush structure and a speed monitor according to an embodiment of the utility model are respectively located on both sides of the rotor axis;

[0029] Figure 4It is a structural schematic diagram of a motor including a baffle according to an embodiment of the utility model.

[0030] Reference numerals:

[0031] 100. Motor;

[0032] 10. Shell; 11. First inner cavity; 12. Main shell; 121. Outer ring plate; 122. End plate;

[0033] 13. open mouth; 14. first end cover; 15. receiving groove; 16. second inner cavity; 17. second end cover;

[0034] 20. rotor shaft; 21. stop step;

[0035] 30. Brush structure; 31. Fixed frame; 32. Brush ring;

[0036] 40. Speed ​​monitor; 41. Resolver stator; 42. Resolver rotor;

[0037] 50. rotor; 60. cover body; 70. transmission shaft; 71. transmission gear;

[0038] 80. Baffle; 81. Power supply socket. DETAILED DESCRIPTION

[0039] Embodiments of the present invention are described in detail below, and the embodiments described with reference to the accompanying drawings are exemplary.

[0040] Reference below Figure 1-Figure 4 A motor 100 according to an embodiment of the present invention is described.

[0041] like Figure 1 and Figure 2 As shown, the motor 100 according to the embodiment of the first aspect of the utility model includes: a housing 10, a rotor shaft 20, a brush structure 30 and a speed monitor 40. A first inner cavity 11 is formed in the housing 10, the rotor shaft 20 is arranged in the first inner cavity 11, the first end of the rotor shaft 20 extends out of the first inner cavity 11, the brush structure 30 is arranged outside the first inner cavity 11, and the brush structure 30 is used to conduct electricity to the first end of the rotor shaft 20. The speed monitor 40 is arranged in the first inner cavity 11, and the speed monitor 40 is used to monitor the speed of the rotor shaft 20.

[0042] Specifically, the brush structure and speed monitor in a traditional motor are a complex integrated structure. The brush structure and the speed monitor are integrated into a whole. The brush structure is in a high-voltage working environment, while the speed monitor is in a low-voltage working environment. When the brush structure and the speed monitor are integrated together, the distance between their wiring harnesses is relatively close. The high-voltage wiring harness of the brush structure will interfere with the low-voltage wiring harness of the speed monitor, thereby affecting the measurement accuracy of the speed monitor.

[0043] Therefore, it is necessary to optimize the internal structure of the motor 100. The first inner cavity 11 in the housing 10 is provided to facilitate the installation of the rotor shaft 20 and to provide an installation position for the speed monitor 40, thereby protecting the speed monitor 40. In addition, the brush structure 30 is provided outside the first inner cavity 11, so that the speed monitor 40 can be isolated from the brush structure 30, and the distance between the two is relatively far, thereby avoiding the interference of the high-voltage wire harness of the brush structure 30 with the low-voltage wire harness of the speed monitor 40, and also reducing the influence of the high-voltage electromagnetic interference when the brush structure 30 is powered on the measurement accuracy of the speed monitor 40.

[0044] Therefore, the motor 100 can isolate the speed monitor 40 from the brush structure 30, and the distance between the two is relatively far, so as to avoid the interference of the high-voltage wiring harness of the brush structure 30 with the low-voltage wiring harness of the speed monitor 40, and also reduce the influence of the high-voltage electromagnetic interference when the brush structure 30 is powered on the measurement accuracy of the speed monitor 40.

[0045] According to some embodiments of the present invention, the motor 100 further includes: a rotor 50 , which is disposed on the rotor shaft 20 and is located in the first inner cavity 11 , and the brush structure 30 and the speed monitor 40 are located on the same axial side of the rotor 50 .

[0046] Among them, the rotor shaft 20 can drive the rotor 50 to rotate, and the speed monitor 40 is located in the first inner cavity 11. When the brush structure 30 and the speed monitor 40 are located on the same axial side of the rotor 50, in order to separate the brush structure 30 and the speed monitor 40, the speed monitor 40 is arranged outside the first inner cavity 11 on the same side as the brush structure 30. In this way, the high-voltage wiring harness of the brush structure 30 can be prevented from interfering with the low-voltage wiring harness of the speed monitor 40, thereby improving the measurement accuracy of the speed monitor 40 on the rotor 50.

[0047] According to another embodiment of the present invention, Figure 1 As shown, the motor 100 further includes: a rotor 50 , which is disposed on the rotor shaft 20 and is located in the first inner cavity 11 , and the brush structure 30 and the speed monitor 40 are located on opposite axial sides of the rotor 50 .

[0048] The speed monitor 40 is located in the first inner cavity 11, and the brush structure 30 is located outside the first inner cavity 11. Furthermore, the rotor 50 is located between the brush structure 30 and the speed monitor 40, so that the rotor 50 can make the brush structure 30 and the speed monitor 40 independent of each other, and can also make the distance between the brush structure 30 and the speed monitor 40 larger. Since the brush structure 30 requires a larger current and voltage when working, a larger electromagnetic interference will be generated near the brush structure 30. The brush structure 30 and the speed monitor 40 are respectively arranged on opposite sides of the rotor shaft 20, so that the line of the brush structure 30 can be prevented from being entangled with the line of the speed monitor 40, and the high-voltage wire harness of the brush structure 30 can be prevented from interfering with the low-voltage wire harness of the speed monitor 40, thereby improving the working accuracy and reliability of the speed monitor 40.

[0049] In addition, the brush structure 30 is formed as a double-sided structure to supply power to the rotor 50 of the motor 100. The speed monitor 40 is arranged on the other side of the brush structure 30 relative to the rotor 50 of the motor 100. While also being affected by the rotor 50 of the motor 100, the power supply wiring of the brush structure 30 during operation can be effectively avoided, thereby improving the working accuracy and reliability of the speed monitor 40.

[0050] Furthermore, baffles 80 are provided on opposite sides of the rotor shaft 20, and the speed monitor 40 is attached to the baffle 80 away from the brush structure 30. The baffle 80 can not only fix the rotor 50, but also prevent the rotor 50 from moving and misaligning. Moreover, the double baffles 80 can further increase the distance between the brush structure 30 and the speed monitor 40, thereby further blocking the electromagnetic interference of the brush structure 30 on the speed monitor 40.

[0051] According to some embodiments of the present invention, Figure 2 As shown, the speed monitor 40 is a rotary transformer, and the speed monitor 40 includes: a rotary transformer stator 41 and a rotary transformer rotor 42 . The rotary transformer stator 41 is disposed on the housing 10 , and the rotary transformer rotor 42 is disposed on the rotor shaft 20 , and the rotary transformer rotor 42 is located on the inner circumference of the rotary transformer stator 41 .

[0052] When the resolver stator 41 is energized, the magnetic field changes with the current to form a rotating magnetic field. This magnetic field interacts with the magnetic field of the resolver rotor 42 to generate electromagnetic force, which can serve as a driving force for the resolver rotor 42 to rotate.

[0053] In addition, the resolver rotor 42 is disposed on the rotor shaft 20 , and the resolver rotor 42 can be used to measure the rotational speed of the rotor shaft 20 . By detecting the changing frequency of the resolver signal, the rotational speed of the rotor can be calculated, thereby facilitating speed control and monitoring of the rotor shaft 20 .

[0054] According to some embodiments of the present invention, Figure 1 As shown, the rotor shaft 20 is provided with a stop step 21 , and the stop step 21 cooperates with the axial stop of the resolver rotor 42 along the rotor shaft 20 .

[0055] The stop step 21 is protruded around the circumference of the rotor shaft 20 , so that the resolver rotor 42 is limitedly matched with the stop step 21 , thereby limiting the movement of the resolver rotor 42 along the axial direction of the rotor shaft 20 .

[0056] According to some embodiments of the utility model, the housing 10 includes: a main shell 12 and a first end cover 14, the main shell 12 has an opening 13, the first end cover 14 is arranged at the opening 13 of the main shell 12, the main shell 12 and the first end cover 14 jointly form a first inner cavity 11, the rotary transformer stator 41 is arranged in the main shell 12, and the brush structure 30 is located on the side of the first end cover 14 facing away from the first inner cavity 11.

[0057] Among them, the shell 10 is mainly composed of a main shell 12 and a first end cover 14. The first end cover 14 can cover the opening 13 of the main shell 12, so as to prevent the entry of dust and water droplets. In this way, the speed monitor 40 can work in an environment with lower dust concentration, and can also prevent the speed monitor 40 from getting damp, thereby improving the measurement accuracy and service life of the speed monitor 40.

[0058] Furthermore, the main housing 12 and the first end cover 14 together form a first inner cavity 11 , so that the speed monitor 40 can be enclosed in the first inner cavity 11 , thereby preventing the speed monitor 40 from affecting the brush structure 30 .

[0059] In addition, the resolver stator 41 is arranged in the main shell 12, and the main shell 12 can protect the resolver stator 41. The brush structure 30 is located on the side of the first end cover 14 that is away from the first inner cavity 11, so that the brush structure 30 can be located outside the first inner cavity 11. The brush structure 30 is separated from the speed monitor 40 by the first end cover 14, thereby avoiding electromagnetic interference of the brush structure 30 to the speed monitor 40.

[0060] According to some embodiments of the utility model, the main shell 12 includes: an outer ring plate 121 and an end plate 122, one axial side of the outer ring plate 121 is connected to the first end cover 14, the end plate 122 is located on the other axial side of the outer ring plate 121, and the end plate 122 is integrally formed with the outer ring plate 121, and the rotating stator 41 is arranged on the end plate 122.

[0061] Among them, the main shell 12 is mainly composed of an outer ring plate 121 and an end plate 122. The outer ring plate 121, the end plate 122 and the first end cover 14 surround a first inner cavity 11. The first end cover 14 and the end plate 122 are located on two axially opposite sides of the outer ring plate 121, so that the two axially opposite sides of the outer ring plate 121 can be respectively sealed, thereby preventing external dust from entering the first inner cavity 11 and preventing the dust from affecting the speed monitor 40.

[0062] Furthermore, the end plate 122 and the outer ring plate 121 are integrally formed, which not only facilitates forming, but also further improves the strength of the main housing 12. In addition, the resolver stator 41 is arranged on the inner side of the end plate 122, thereby preventing the resolver stator 41 from being affected by external dust.

[0063] According to some embodiments of the present invention, Figure 1 As shown, an accommodating groove 15 is formed on the end surface of the housing 10 , and the first end of the rotor shaft 20 and the brush structure 30 are disposed in the accommodating groove 15 .

[0064] An accommodating groove 15 is provided at one end of the housing 10 close to the brush structure 30 , which can facilitate the insertion of the first end of the rotor shaft 20 and provide an installation space for the brush structure 30 .

[0065] According to some embodiments of the present invention, Figure 1 As shown, the motor 100 further includes a cover 60 , which is disposed on the housing 10 and covers the notch of the receiving groove 15 .

[0066] The cover 60 can separate the brush structure 30 from the outside world, prevent the brush structure 30 from being affected by external factors such as dust and water droplets, and facilitate the replacement of the brush structure 30. When the brush structure 30 needs to be replaced, it is only necessary to open the cover 60, thereby reducing the complexity and cost of maintenance work.

[0067] According to some embodiments of the present invention, the cover body 60 is screwed to the housing 10 , and / or the cover body 60 is snap-connected to the housing 10 .

[0068] The cover body 60 and the housing 10 may be fixedly connected by threaded connection, so that the connection between the cover body 60 and the housing 10 can be more stable and firm.

[0069] Alternatively, the cover body 60 and the shell 10 can be fixedly connected by snapping together. The cover body 60 can be provided with a snap buckle, and correspondingly, the shell 10 is provided with a snap slot, and the snap buckle extends into the snap slot, thereby realizing the snap connection between the cover body 60 and the shell 10, and also facilitating the installation and disassembly of the cover body 60 and the shell 10.

[0070] According to the specific embodiment of the utility model, Figure 2 As shown, the brush structure 30 includes: a fixing frame 31, a positive brush ring 32, a negative brush ring 32, a positive brush and a negative brush, the fixing frame 31 is arranged on the housing 10, the positive brush ring and the negative brush ring are arranged on the rotor shaft 20, and the positive brush ring and the negative brush ring are arranged at intervals along the axial direction of the rotor shaft 20, the positive brush and the negative brush are arranged on the fixing frame 31, and the positive brush and the negative brush are arranged at intervals along the axial direction of the fixing frame 31, the positive brush is in contact with the positive brush ring, and the negative brush is in contact with the negative brush ring.

[0071] Specifically, the brush ring 32 is divided into a positive brush ring and a negative brush ring. The positive brush ring is an annular conductive component located in the motor 100 and in contact with the positive brush. It can provide a closed conductive loop, so that the positive brush can be connected to an external circuit. Similarly, the negative brush ring, by contacting the negative brush, draws current from the armature and then transfers it to the external circuit, completing the transmission and conversion of electrical energy.

[0072] Furthermore, the setting of the fixing frame 31 can facilitate the fixed installation of the positive brush and the negative brush, and the positive brush ring and the negative brush ring are arranged at intervals along the axial direction of the rotor shaft 20, so as to avoid the positive brush ring and the negative brush ring from affecting each other. The positive brush and the negative brush are arranged at intervals along the axial direction of the fixing frame 31, so as to avoid the positive brush and the negative brush from affecting each other.

[0073] According to some embodiments of the present invention, there are multiple positive brushes, which are spaced apart in the circumferential direction of the fixing frame 31 , and / or there are multiple negative brushes, which are spaced apart in the circumferential direction of the fixing frame 31 .

[0074] Among them, multiple positive brushes and multiple negative brushes are arranged at intervals in the circumferential direction of the fixing frame 31, which can share the current load, reduce the heat generation of a single brush, facilitate heat dissipation, reduce the temperature rise of the brush, and improve the stability and reliability of the brush.

[0075] Moreover, multiple positive brushes and multiple negative brushes can evenly share the workload, thereby reducing the wear rate of a single brush, thereby extending the life of the entire brush and reducing the frequency of replacement and maintenance.

[0076] According to some embodiments of the present invention, Figure 1 As shown, the housing 10 forms a second inner cavity 16 , and the second end of the rotor shaft 20 extends from the first inner cavity 11 to the second inner cavity 16 . The motor 100 also includes: a transmission shaft 70 , which is disposed in the second inner cavity 16 and connected to the rotor shaft 20 .

[0077] Among them, a second inner cavity 16 is opened at one end of the shell 10 close to the transmission shaft 70, which can facilitate the insertion of the second end of the rotor shaft 20. The transmission shaft 70 is arranged in the second inner cavity 16, which can facilitate the transmission connection between the second end of the rotor shaft 20 and the transmission shaft 70, thereby facilitating the transmission of power.

[0078] According to some embodiments of the present invention, Figure 1 As shown, the housing 10 includes: a main housing 12, a first end cover 14 and a second end cover 17. The main housing 12 has an opening 13. The first end cover 14 is arranged at the opening 13 of the main housing 12. The main housing 12 and the first end cover 14 jointly form a first inner cavity 11. The rotary transformer stator 41 is arranged at the main housing 12. The brush structure 30 is located on the side of the first end cover 14 facing away from the first inner cavity 11. The second end cover 17 is arranged at the main housing 12. The first end cover 14 and the second end cover 17 are respectively located on opposite sides of the main housing 12. The second end cover 17 and the main housing 12 jointly form a second inner cavity 16.

[0079] The main housing 12 and the first end cover 14 jointly form the first inner cavity 11, thereby preventing the brush structure 30 from interfering with the speed monitor 40 through the first inner cavity 11, thereby improving the measurement accuracy of the speed monitor 40. Furthermore, the second end cover 17 and the main housing 12 jointly form the second inner cavity 16, and since the speed monitor 40 is disposed close to the second inner cavity 16, the distance between the brush structure 30 and the speed monitor 40 can be further increased, thereby further reducing the electromagnetic interference of the brush structure 30 on the speed monitor 40.

[0080] According to some embodiments of the present invention, Figure 3 As shown, the outer circumference of the transmission shaft 70 is integrally formed with a transmission tooth 71. In this way, not only the number of parts can be reduced, but also the installation procedure can be reduced, and the strength of the transmission tooth 71 can be further improved.

[0081] Moreover, the transmission teeth 71 of the transmission shaft 70 are also isolated from the outside and located in the second inner cavity 16 , which can effectively reduce the dust concentration in the working environment, thereby ensuring the effective working time of the speed monitor 40 .

[0082] In addition, a power supply socket 81 is provided at the brush structure 30 , so as to facilitate supplying electric energy to the brush structure 30 .

[0083] The power assembly according to the second embodiment of the utility model includes: the motor 100 of the above embodiment.

[0084] A vehicle according to an embodiment of the third aspect of the utility model includes: a powertrain of the above embodiment.

[0085] In the description of the present invention, it should be understood that the terms "center", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0086] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. Although the embodiments of the utility model have been shown and described, it can be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and purpose of the utility model, and the scope of the utility model is defined by the claims and their equivalents.

Claims

1. A motor, characterized in that: include: A shell having a first inner cavity formed therein; a rotor shaft, wherein the rotor shaft is disposed in the first inner cavity, and a first end of the rotor shaft extends out of the first inner cavity; a brush structure, the brush structure being disposed outside the first inner cavity and configured to conduct electricity to the first end of the rotor shaft; A rotation speed monitor is disposed in the first inner cavity and is used to monitor the rotation speed of the rotor shaft.

2. The motor according to claim 1, characterized in that Also includes: The rotor is arranged on the rotor shaft and located in the first inner cavity, and the brush structure and the speed monitor are located on the same axial side of the rotor.

3. The motor according to claim 1, characterized in that Also includes: The rotor is arranged on the rotor shaft and located in the first inner cavity, and the brush structure and the speed monitor are located on two opposite sides of the rotor in the axial direction.

4. The motor according to claim 1, characterized in that The speed monitor is a rotary transformer and includes: A resolver stator, the resolver stator being arranged in the housing; The resolver rotor is arranged on the rotor shaft and located at the inner periphery of the resolver stator.

5. The motor according to claim 4, characterized in that The rotor shaft is provided with a stop step, and the stop step cooperates with the axial stop of the resolver rotor along the rotor shaft.

6. The motor according to claim 4, characterized in that The housing comprises: A main shell, wherein the main shell has an opening; The first end cover is arranged at the opening of the main shell, the main shell and the first end cover together form the first inner cavity, the rotary transformer stator is arranged in the main shell, and the brush structure is located on the side of the first end cover facing away from the first inner cavity.

7. The motor according to claim 6, characterized in that The main shell comprises: An outer ring plate, one axial side of the outer ring plate is connected to the first end cover; The end plate is located at the other axial side of the outer ring plate and is integrally formed with the outer ring plate, and the rotary transformer stator is arranged on the end plate.

8. The motor according to claim 1, characterized in that An accommodating groove is formed on the end surface of the housing, and the first end of the rotor shaft and the brush structure are arranged in the accommodating groove.

9. The motor according to claim 8, characterized in that Also includes: A cover body is disposed on the shell and covers the notch of the accommodating groove.

10. The motor according to claim 9, characterized in that The cover is screwed to the housing; and / or The cover is clamped with the shell.

11. The motor according to claim 1, characterized in that The brush structure comprises: A fixing frame, the fixing frame is arranged on the housing; A positive brush ring and a negative brush ring, wherein the positive brush ring and the negative brush ring are arranged on the rotor shaft and spaced apart along the axial direction of the rotor shaft; A positive brush and a negative brush are provided on the fixing frame and spaced apart along the axial direction of the fixing frame. The positive brush contacts the positive brush ring and the negative brush contacts the negative brush ring.

12. The motor according to claim 11, characterized in that There are a plurality of positive electrode brushes, and the plurality of positive electrode brushes are arranged at intervals in the circumferential direction of the fixing frame; and / or There are a plurality of negative electrode brushes, and the plurality of negative electrode brushes are arranged at intervals in the circumferential direction of the fixing frame.

13. The motor according to claim 4, characterized in that The housing is formed with a second inner cavity, the second end of the rotor shaft extends from the first inner cavity to the second inner cavity, and the motor further includes: A transmission shaft is disposed in the second inner cavity and connected to the rotor shaft.

14. The motor according to claim 13, characterized in that The housing comprises: A main shell, wherein the main shell has an opening; a first end cover, wherein the first end cover is disposed at the opening of the main housing, the main housing and the first end cover together form the first inner cavity, the resolver stator is disposed at the main housing, and the brush structure is located at a side of the first end cover facing away from the first inner cavity; The second end cover is arranged on the main shell, the first end cover and the second end cover are respectively located on two opposite sides of the main shell, and the second end cover and the main shell jointly form the second inner cavity.

15. The motor according to claim 13, characterized in that The outer circumference of the transmission shaft is integrally formed with transmission teeth.

16. A powertrain, characterized in that: include: The motor according to any one of claims 1 to 15.

17. A vehicle, characterized in that: include: The powertrain of claim 16.

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