Electric motor and power assembly device

Abstract

Disclosed are an electric motor and a power assembly device. The electric motor comprises a casing, a stator mechanism and a rotor mechanism, wherein the stator mechanism is fixedly arranged in the casing, the rotor mechanism is rotatably arranged in the stator mechanism, and the casing is provided with a liquid supply flow channel. A first liquid outlet and a second liquid outlet are respectively provided at two ends of the stator mechanism; and the stator mechanism comprises a first flow channel, two ends of the first flow channel being in communication with the first liquid outlet and a second liquid outlet, respectively. The stator mechanism comprises a lamination, the lamination comprising a first through slot and a second through slot. The first through slot is in communication with the second through slot to form a second flow channel through which the first flow channel is in communication with the liquid supply flow channel. The first flow channel and the second flow channel form a cooling flow channel in the stator mechanism, a cooling liquid is input into the cooling flow channel in the stator mechanism through the liquid supply flow channel of the casing, the cooling liquid fully exchanges heat with the stator mechanism, and the cooling liquid is then sprayed out through the liquid outlets in two end surfaces of the stator mechanism, to enable a coil winding of the stator mechanism to be cooled, such that the cooling capacity of the electric motor can be improved.

Description

Motor and powertrain equipment

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to the Chinese patent application filed with the State Intellectual Property Office of China on November 22, 2023, with application number 202311574608.0 and application name “Motor and Powertrain Equipment”, the entire contents of which are incorporated by reference into this application. Technical Field

[0003] The present application relates to the field of motors, and in particular to a motor and a powertrain device. Background Art

[0004] Hybrid electric vehicle transmissions typically require dual motors: a generator and a drive motor. These motors typically employ two design approaches: shrink-fit motors and lug-type motors. The thermal design of shrink-fit motors typically relies on flow channels formed between the stator core and the motor housing to cool the outer surfaces of the stator core and coils. This allows the coolant to fully contact the stator core and coils, effectively exchanging heat with them and improving the motor's heat dissipation capacity. Due to assembly yield concerns, shrink-fit motors are typically not designed with shrink-fit motors, with lug-type designs being the preferred approach.

[0005] In the thermal design of lug-mounted motors, there is no interference fit between the outer surface of the stator core and the housing, and there are no flow channels on the stator core surface, which reduces the heat exchange effect of the coolant to a certain extent. Therefore, it is necessary to design a new stator cooling solution for lug-mounted motors to improve the motor's cooling capacity and free up space for performance optimization.

[0006] Summary of the Invention

[0007] The present application provides a motor and a power assembly device to improve the cooling capability of a lug-type motor.

[0008] In a first aspect, the present application provides a motor, which may include a housing, a stator mechanism, and a rotor mechanism. The stator mechanism may be fixedly disposed in the housing, and the rotor mechanism may be rotatably disposed in the stator mechanism. The housing has a liquid supply channel. The stator mechanism is provided with a first liquid outlet and a second liquid outlet at both ends of the axial direction of the stator mechanism, respectively; the stator mechanism has a first channel, and both ends of the first channel are connected to the first liquid outlet and the second liquid outlet, respectively. The stator mechanism includes a punching sheet, the axial direction of the punching sheet coincides with the axial direction of the stator mechanism, the punching sheet includes a first through groove and a second through groove, the first through groove extends along the circumference of the punching sheet, and the first through groove passes through the punching sheet along the axial direction of the punching sheet, the second through groove extends along the radial direction of the punching sheet, and the second through groove passes through the punching sheet along the axial direction of the punching sheet; the first through groove and the second through groove are connected to form a second channel, and the first channel is connected to the liquid supply channel through the second channel.

[0009] In the technical solution provided in the present application, the stator mechanism has a first flow channel and a second flow channel, forming a cooling flow channel inside the stator mechanism. The coolant can be input into the cooling flow channel inside the stator mechanism through the liquid supply channel of the shell. The coolant and the stator mechanism can fully exchange heat, and then the coolant can be sprayed out from the liquid outlets on the two end faces of the stator mechanism to cool the coil windings of the stator mechanism, thereby improving the cooling capacity of the motor and ensuring the heat dissipation requirements of the motor.

[0010] In a specific embodiment, the second flow channel may include a radial section and an axial section. The radial section may be arranged along the radial direction of the stator mechanism, and one end of the radial section may be connected to the liquid supply channel. The axial section may be arranged along the axial direction of the stator mechanism, and the axial section may extend along the circumference of the stator mechanism. The first flow channel may be connected to the other end of the radial section through the axial section. The first through groove forms the axial section, and the second through groove forms the radial section. The radial section is connected to the liquid supply channel, which can realize the connection between the second flow channel and the liquid supply channel. The axial section extends along the circumference of the stator mechanism, which can realize the circumferential flow of the coolant along the stator mechanism, thereby increasing the cooling area of ​​the stator mechanism by the coolant and improving the cooling effect of the coolant on the stator mechanism.

[0011] In a specific embodiment, in the axial direction of the stator mechanism, the size of the axial section can be larger than the size of the radial section. The flow path of the coolant in the axial direction of the stator mechanism is longer, the cooling area is larger, and the cooling effect is more significant.

[0012] In a specific embodiment, the axial section may be an annular channel. The cooling area of ​​the coolant in the circumferential direction of the stator mechanism is large, which can improve the cooling effect of the coolant on the stator mechanism.

[0013] In a specific embodiment, the axial section can be an arc-shaped channel. When there are multiple axial sections, the multiple axial sections are independent of each other and can form multiple independent cooling channels, which can achieve uniform flow of coolant and improve the temperature uniformity of the stator structure.

[0014] In one specific embodiment, the axial segments may include multiple first axial segments and multiple second axial segments. The multiple first axial segments may be spaced apart circumferentially around the stator mechanism, and the second axial segments may extend circumferentially along the stator mechanism. Adjacent first axial segments may be connected via the second axial segments. At least one first axial segment may be connected to the liquid supply channel via a radial segment, and the first channel may be connected to the first axial segment via the second axial segment. The multiple first axial segments spaced apart circumferentially around the stator mechanism can achieve uniform coolant flow and improve temperature uniformity of the stator mechanism.

[0015] In one specific embodiment, the first axial segment has a head end and a tail end in the axial direction of the stator mechanism. In the circumferential direction of the stator mechanism, the head end of the first axial segment can be connected to the head end of an adjacent first axial segment on one side of the first axial segment via a second axial segment, and the tail end of the first axial segment can be connected to the tail end of an adjacent first axial segment on the other side of the first axial segment via the second axial segment. This can increase the flow path of the coolant and the cooling area, allowing the coolant to more fully exchange heat within the stator mechanism, resulting in a more significant cooling effect.

[0016] In a specific embodiment, the stator mechanism may include a plurality of stacked sheets; some adjacent sheets may be provided with a first through-hole, which extends axially through the sheet; some adjacent sheets may be provided with a third through-slot, which extends circumferentially and axially through the sheet, and corresponds to the first through-slot in the axial direction of the sheet; some adjacent sheets may be provided with a first through-slot and a second through-slot; a plurality of first through-holes are connected to form a first flow channel; a plurality of first through-slots, a plurality of second through-slots, and a plurality of third through-slots are connected to form a second flow channel. Compared to a stator mechanism formed as a whole, a stator mechanism formed by stacking multiple sheets can achieve no magnetic leakage and improve motor performance.

[0017] In a specific feasible implementation scheme, a punch provided with a first through hole may be provided with a second through hole, the second through hole passes through the punch along the axial direction of the punch, and the second through hole and the first through hole are spaced apart in the radial direction of the punch; a punch provided with a third through slot may be provided with a third through hole, the third through hole passes through the punch along the axial direction of the punch, the third through hole corresponds to the second through hole in the axial direction of the punch, and the third through hole and the third through slot are spaced apart in the radial direction of the punch; a punch provided with a first through slot and a second through slot may be provided with a fourth through hole, the fourth through hole passes through the punch along the axial direction of the punch, the fourth through hole corresponds to the second through hole in the axial direction of the punch, and the fourth through hole is connected to the first through slot through the second through slot; a plurality of second through holes, a plurality of third through holes and a plurality of fourth through holes are connected to form a third flow channel; one end of the third flow channel may be connected to the liquid supply channel, and the first flow channel may be connected to the other end of the third flow channel through the second flow channel to be connected to the liquid supply channel. The provision of the third flow channel facilitates communication with the liquid supply flow channel, thereby facilitating communication between the cooling flow channel inside the stator mechanism and the liquid supply flow channel.

[0018] In a specific feasible implementation scheme, some adjacent punches may be provided with a fifth through hole, which passes through the punch along the axial direction of the punch. The fifth through hole corresponds to the first through hole in the axial direction of the punch, and multiple first through holes and multiple fifth through holes can form a first flow channel.

[0019] In a specific embodiment, the stator mechanism may include a stator body, which may be a hollow cylindrical structure. The rotor mechanism and the stator body may be coaxially arranged. The first flow channel and the second flow channel may be respectively arranged inside the stator body. The structure of the stator body is relatively simple.

[0020] In one specific embodiment, the stator body may have an outer circumferential surface and an inner circumferential surface that are radially opposed to each other in the stator mechanism. The outer circumferential surface of the stator body may be provided with a lug portion that extends axially along the stator mechanism, and the inner circumferential surface of the stator body may be provided with a tooth portion that extends axially along the stator mechanism. The stator mechanism may include a coil winding that is wound around the tooth portion. The provision of the lug portion facilitates connection of the stator body to the housing.

[0021] In a second aspect, the present application further provides a powertrain device, which may include a speed change mechanism, an output shaft, and a motor as described in any of the possible implementations of the first aspect. The speed change mechanism can change the speed of the motor, and the output shaft can be connected to the rotor mechanism of the motor via the speed change mechanism. The motor has good cooling capabilities, operates reliably, and the powertrain device has high stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] FIG1 is a schematic structural diagram of a motor provided by the present application at a certain viewing angle;

[0023] FIG2 is a schematic structural diagram of the motor provided in this application from another perspective;

[0024] FIG3 is a schematic diagram of a possible cooling channel inside the stator mechanism of the motor provided in this application;

[0025] FIG4 is a schematic structural diagram of a punching sheet A1 of a motor provided in this application;

[0026] FIG5 is a schematic structural diagram of a punching sheet A2 of a motor provided in this application;

[0027] FIG6 is a schematic structural diagram of a punching sheet A3 of a motor provided in this application;

[0028] FIG7 is a schematic cross-sectional view of the motor provided by the present application along the axial direction;

[0029] FIG8 is a schematic structural diagram of a punching sheet A4 of a motor provided in this application;

[0030] FIG9 is a schematic cross-sectional view of the motor provided by the present application along the axial direction;

[0031] FIG10 is a schematic diagram of another possible cooling channel inside the stator mechanism of the motor provided by the present application;

[0032] FIG11 is a schematic structural diagram of a punching sheet B1 of a motor provided in this application;

[0033] FIG12 is a schematic structural diagram of a punching sheet B2 of a motor provided in this application;

[0034] FIG13 is a schematic structural diagram of a punching sheet B3 of a motor provided in this application;

[0035] FIG14 is a schematic diagram of another possible cooling channel inside the stator mechanism of the motor provided by the present application;

[0036] FIG15 is a schematic structural diagram of a punching sheet C1 of a motor provided in this application;

[0037] FIG16 is a schematic structural diagram of a punching sheet C2 of a motor provided in this application;

[0038] FIG17 is a schematic structural diagram of a punching sheet C3 of a motor provided in this application;

[0039] FIG18 is a schematic structural diagram of the punching sheet C4 of the motor provided in this application.

[0040] Figure numerals: 10-stator mechanism; 11-stator body; 12-lifting ear portion; 13-tooth portion; 14-first liquid outlet; 15-plug; 16-first flow channel; 17-second flow channel; 18-third flow channel; 19-second liquid outlet; 171-radial section; 172-axial section; 1721-first axial section; 1722-second axial section; 21-first through hole; 22-second through hole; 23-third through hole; 24-fourth through hole; 25-fifth through hole; 31-third through slot; 32-first through slot; 33-second through slot; 34-fourth through slot. DETAILED DESCRIPTION

[0041] In order to make the purpose, technical solutions and advantages of the present application clearer, the embodiments of the present application will be further described in detail with reference to the accompanying drawings. However, the example embodiments can be implemented in various forms and should not be construed as being limited to the embodiments set forth herein. The same reference numerals in the figures represent the same or similar structures, and thus their repeated description will be omitted. The words expressing position and direction described in the embodiments of the present application are all explained with reference to the accompanying drawings as examples, but changes may be made as needed, and the changes made are all included in the scope of protection of the present application. The drawings in the embodiments of the present application are only used to illustrate the relative position relationship and do not represent the true proportion.

[0042] The following description sets forth specific details to facilitate understanding of the present application. However, the embodiments of the present application can be implemented in a variety of other ways than those described herein, and those skilled in the art can make similar generalizations without violating the connotations of the embodiments of the present application. Therefore, the present application is not limited to the specific embodiments disclosed below.

[0043] For ease of understanding, the application scenarios of the motors involved in this application are first described. The motors provided in the embodiments of this application can be used in the automotive field, such as in electric vehicles or hybrid vehicles, as components of an automotive powertrain. In actual application, the automotive powertrain equipment may include a speed change mechanism, an output shaft, and a motor. The speed change mechanism is used to change the speed of the motor, and the output shaft is connected to the rotor mechanism of the motor through the speed change mechanism.

[0044] In the thermal design of lug-mounted motors, because there's no interference fit between the outer surface of the stator core and the housing, and because there's no flow channel on the stator core surface, the coolant's heat exchange efficiency is somewhat reduced. Therefore, a new stator cooling solution is needed for lug-mounted motors to improve the motor's cooling capacity and free up space for performance optimization. Based on this, embodiments of the present application provide a motor that improves the cooling capacity of lug-mounted motors.

[0045] The motor provided in an embodiment of the present application may include a housing, a stator mechanism, and a rotor mechanism, wherein the housing has a liquid supply channel. The stator mechanism is fixedly disposed within the housing, and the rotor mechanism is rotatably disposed within the stator mechanism. The rotor mechanism may be located within the stator mechanism and rotatably connected to the housing via a rotating shaft, so that the rotor mechanism can be rotatably disposed within the stator mechanism.

[0046] FIG1 shows a schematic diagram of the structure of the motor provided by the present application from a certain perspective, and FIG2 shows a schematic diagram of the structure of the motor provided by the present application from another perspective. The direction indicated by the x-axis in FIG1 represents the axial direction of the stator mechanism. As shown in FIG1 and FIG2 , the stator mechanism has a first end face and a second end face that are opposite to each other in its own axial direction. The first end face and the second end face can be understood as the front end face and the rear end face of the stator mechanism, respectively. The first end face and the second end face are respectively provided with a first liquid outlet 14 and a second liquid outlet 19.

[0047] Figure 3 shows a schematic diagram of a possible cooling channel within the stator mechanism of the motor provided herein. As shown in Figure 3, a first channel 16 and a second channel 17 may be provided within the stator mechanism. The first channel 16 may be arranged axially along the stator mechanism. The two ends of the first channel 16 are connected to the first liquid outlet 14 and the second liquid outlet 19, respectively. Furthermore, the first channel 16 is connected to the liquid supply channel via the second channel 17.

[0048] In one possible embodiment, as shown in FIG1 , the stator mechanism includes a stator body 11, which can be made of iron or other metal materials. The stator body 11 can be a hollow cylindrical structure, and the stator body 11 has an outer circumferential surface and an inner circumferential surface that are opposite to each other in its own radial direction. The axial direction of the stator body 11 is the axial direction of the stator mechanism, and the first end face and the second end face of the stator mechanism are also the front and rear end faces of the stator body 11 in its own axial direction; the radial direction of the stator body 11 is the radial direction of the stator mechanism. The rotor mechanism is located in the hollow cavity of the stator body 11 and can be coaxially arranged with the stator body 11. It can be understood that the hollow cavity of the stator body 11 mentioned here refers to the accommodation space surrounded by the inner circumferential surface of the stator body 11. The first flow channel 16 and the second flow channel 17 can be respectively arranged inside the stator body 11. It can be understood that the interior of the stator body 11 mentioned here refers to the interior of the physical structure having the above-mentioned outer circumferential surface, inner circumferential surface and front and rear end faces.

[0049] In a specific implementation, the outer circumferential surface of the stator body 11 may be provided with a lifting lug 12, which may extend axially along the stator mechanism. The inner circumferential surface of the stator body 11 may be provided with a tooth 13, which may extend axially along the stator mechanism. The stator mechanism may also include a coil winding, which may be wound around the tooth 13. The coil winding may be formed by a metal coil wound around the tooth 13. When the coil winding is energized, the rotor mechanism rotates.

[0050] The motor provided in the embodiment of the present application can have a stator mechanism having a first flow channel 16 and a second flow channel 17, forming a cooling flow channel inside the stator mechanism. The coolant can be input into the cooling flow channel inside the stator mechanism through the liquid supply channel of the shell. The coolant and the stator mechanism can fully exchange heat, and then the coolant can be sprayed out from the liquid outlets on the two end faces of the stator mechanism to cool the coil windings of the stator mechanism, thereby improving the cooling capacity of the motor and ensuring the heat dissipation requirements of the motor.

[0051] In actual use, the coolant in the cooling channel can directly cool the stator body 11 and indirectly cool the coil windings. After the coolant is ejected from the cooling channel, it can directly cool the coil windings. The coolant can flow from the top of the powertrain housing to the motor housing, and then to the stator body 11. After exchanging heat with the stator body 11 and the coil windings, the coolant can flow to the powertrain oil pan (a portion of the bottom of the powertrain housing; the coolant flows toward the bottom of the powertrain housing under the action of gravity). After cooling the coolant, the low-temperature coolant can be pumped to the top of the powertrain housing by a pump, thereby achieving coolant circulation and continuous cooling of the stator mechanism.

[0052] As a possible embodiment, as shown in FIG3 , the second flow channel 17 may include a radial section 171 and an axial section 172. The radial section 171 may be arranged along the radial direction of the stator mechanism, or the radial section 171 may be at an angle to the radial direction of the stator mechanism, and one end of the radial section 171 is connected to the liquid supply channel. The axial section 172 may be arranged along the axial direction of the stator mechanism, or the axial section 172 may be at an angle to the axial direction of the stator mechanism, and the first flow channel 16 is connected to the other end of the radial section 171 through the axial section 172, thereby achieving communication between the first flow channel 16 and the liquid supply channel. In the axial direction of the stator mechanism, the size of the axial section 172 may be larger than the size of the radial section 171, so that the coolant can flow along the axial direction of the stator mechanism, thereby increasing the cooling area of ​​the stator mechanism by the coolant.

[0053] In a specific implementation, the axial section 172 can extend along the circumference of the stator mechanism. The axial section 172 can be annular or arc-shaped in a cross-section perpendicular to the axial direction of the stator mechanism. Correspondingly, the axial section 172 can be an annular or arc-shaped channel. Thus, the axial section 172 can enable the coolant to flow axially and circumferentially within the stator mechanism, achieving uniform flow of the coolant within the stator mechanism, further increasing the cooling area of ​​the stator mechanism and improving the cooling effect of the coolant on the stator mechanism. Furthermore, the risk of local hot spots in the stator mechanism due to poor coolant flow and uneven distribution can be avoided, thereby improving the temperature uniformity of the stator mechanism and contributing to improved motor operating stability.

[0054] As a possible embodiment, the stator mechanism may further include a third flow channel 18, which may be arranged along the axial direction of the stator mechanism. One end of the third flow channel 18 may be connected to the liquid supply channel, and the first flow channel 16 may be connected to the other end of the third flow channel 18 via the second flow channel 17, thereby achieving communication between the first flow channel 16 and the liquid supply channel. Specifically, one end of the radial section 171 of the second flow channel 17 may be connected to the third flow channel 18, and the other end of the radial section 171 may be connected to the first flow channel 16 via the axial section 172, thereby achieving communication between the first flow channel 16 and the third flow channel 18 via the second flow channel 17. In actual application, the coolant may flow from the liquid supply channel into the third flow channel 18, and then flow into the radial section 171 of the second flow channel 17, the axial section 172 of the second flow channel 17, and the first flow channel 16 in sequence, and then be ejected out of the stator body 11 through the first liquid outlet 14 and the second liquid outlet 19. The third flow channel 18, the first flow channel 16 and the second flow channel 17 together form a cooling flow channel inside the stator mechanism. The setting of the third flow channel 18 can increase the cooling flow channel inside the stator mechanism, increase the cooling area of ​​the stator mechanism by the coolant, and thus further enhance the cooling effect of the coolant on the stator mechanism.

[0055] In a specific implementation, the third flow channel 18 can be provided inside the lifting ear portion 12. When assembling the stator mechanism, the lifting ear portion 12 can correspond to the liquid supply channel of the shell, so that for the stator mechanism as a whole, coolant can be introduced through the lifting ear portion 12. During actual assembly, the stator body 11 can be fixedly connected to the shell through the lifting ear portion 12. The third flow channel 18 is provided in the lifting ear portion 12, which facilitates the docking of the third flow channel 18 with the liquid supply channel of the shell, thereby facilitating the assembly of the stator mechanism in the shell. In actual application, there can be multiple lifting ear portions 12, wherein at least one lifting ear portion 12 can be provided with the third flow channel 18. Correspondingly, the shell can be provided with at least one liquid supply channel, so that coolant can be introduced through the third flow channel 18 in at least one lifting ear portion 12, which can increase the flow rate of coolant flowing into the stator mechanism and improve the cooling efficiency of the stator mechanism by the coolant.

[0056] As a possible embodiment, the stator mechanism can be formed by stacking a plurality of punching sheets, and the punching sheets can be an annular structure, and a plurality of punching sheets can be coaxially arranged to form a hollow cylindrical stator body 11. The outer edge of the punching sheet can be provided with a protrusion, and the protrusions of the plurality of punching sheets can form a hanging ear portion 12. The inner edge of the punching sheet can be provided with a tooth-like structure, and the tooth-like structure of the plurality of punching sheets can form a tooth portion 13. Adjacent punching sheets can be fixedly connected by welding or the like, or a plurality of punching sheets can be fixedly connected to form a whole by a connector arranged along the axial direction of the stator mechanism. Compared with an integrally formed stator mechanism, a stator mechanism formed by stacking multiple punching sheets can achieve no magnetic leakage and improve the performance of the motor. The plurality of punching sheets can be of various types, and are combined to form a stator mechanism with an internal cooling channel.

[0057] In a specific implementation, some adjacent punches may be provided with a first through hole 21 and a second through hole 22, both of which penetrate the punch along the axial direction of the punch, and the second through hole 22 and the first through hole 21 are spaced apart in the radial direction of the punch. Some adjacent punches may be provided with a third through slot 31 and a third through hole 23, the third through slot 31 extending along the circumferential direction of the punch and penetrating the punch along the axial direction of the punch, the third through slot 31 corresponding to the first through slot 32 in the axial direction of the punch, the third through hole 23 penetrating the punch along the axial direction of the punch, the third through hole 23 corresponding to the second through hole 22 in the axial direction of the punch, and the third through hole 23 and the third through slot 31 spaced apart in the radial direction of the punch. Some adjacent punching plates may be provided with a first through-slot 32, a second through-slot 33, and a fourth through-hole 24. The fourth through-hole 24 extends through the punching plate along the axial direction of the punching plate. The fourth through-hole 24 corresponds to the second through-hole 22 in the axial direction of the punching plate, and the fourth through-hole 24 is connected to the first through-slot 32 via the second through-slot 33. The axial direction of the above-mentioned through-holes may be parallel to the axial direction of the stator mechanism, that is, the through-holes extend along the axial direction of the stator mechanism. The through-slots may be understood as hollowed-out areas on the punching plate, extending along the axial direction and / or circumferential direction of the stator mechanism. The first flow channel 16 may be formed by a plurality of first through-holes 21. The first liquid outlet 14 and the second liquid outlet 19 corresponding to the two ends of the first flow channel 16 may be formed by the first through-holes 21, respectively. The third flow channel 18 may be formed by a plurality of second through-holes 22, a plurality of third through-holes 23, and a plurality of fourth through-holes 24. The second flow channel 17 may be formed by a plurality of third through-slots 31, a plurality of first through-slots 32, and a plurality of second through-slots 33.

[0058] The following examples list several possible cooling channel forms inside the stator mechanism and the corresponding punching sheet types.

[0059] In one embodiment, as shown in Figure 3, the stator mechanism has a first flow channel 16, a second flow channel 17, and a third flow channel 18 that are sequentially connected. The second flow channel 17 includes a radial section 171 and an axial section 172. The axial section 172 of the second flow channel 17 is an annular channel. The stator mechanism is composed of three types of stacked punchings. For ease of description, the three types of punchings are referred to as punchings A1, A2, and A3, respectively.

[0060] FIG4 shows a schematic structural diagram of the punching sheet A1 of the motor provided in the present application, FIG5 shows a schematic structural diagram of the punching sheet A2 of the motor provided in the present application, and FIG6 shows a schematic structural diagram of the punching sheet A3 of the motor provided in the present application. As shown in FIG4 , the punching sheet A1 is provided with a first through hole 21 and a second through hole 22, and the second through hole 22 is located on the protrusion of the punching sheet A1. As shown in FIG5 , the punching sheet A2 is provided with a third through slot 31 and a third through hole 23, and there are multiple third through slots 31, and the multiple third through slots 31 are arranged at intervals along the circumference of the stator mechanism. The third through slots 31 are arc-shaped, and the third through hole 23 is located on the protrusion of the punching sheet A2. The aperture of the third through hole 23 can be the same as that of the second through hole 22, and the position of the third through hole 23 corresponds to that of the second through hole 22 in the axial direction of the stator mechanism; FIG5 illustrates the case where there are three third through slots 31. As shown in Figure 6, the punching piece A3 is provided with a first through groove 32, a second through groove 33 and a fourth through hole 24. There are multiple first through grooves 32, and the multiple first through grooves 32 are arranged at intervals along the circumference of the stator mechanism. The first through groove 32 is arc-shaped, and the position of the first through groove 32 and the third through groove 31 are offset from each other in the circumferential direction of the stator mechanism. The fourth through hole 24 is located on the protrusion of the punching piece A3. The aperture of the fourth through hole 24 can be the same as that of the second through hole 22. The position of the fourth through hole 24 corresponds to the second through hole 22 in the axial direction of the stator mechanism. The second through groove 33 is linear, and the second through groove 33 connects one of the first through grooves 32 and the fourth through hole 24; Figure 6 illustrates the case where there are three first through grooves 32.

[0061] FIG7 shows a schematic cross-sectional view of the motor provided in the present application along the axial direction. In conjunction with FIG3 and FIG7 , when forming the stator structure, multiple punching sheets A1, multiple punching sheets A2, multiple punching sheets A3, multiple punching sheets A2, and multiple punching sheets A1 are stacked in sequence, so that multiple first through holes 21 are connected to form a first flow channel 16, and the first flow channel 16 is divided into two sections, which respectively connect the first liquid outlet 14 and the second liquid outlet 19; multiple second through holes 22, multiple third through holes 23, and multiple fourth through holes 24 are connected to form a third flow channel 18; multiple third through slots 31, multiple first through slots 32, and multiple second through slots 33 are connected to form a second flow channel 17. Among them, the plurality of third through-slots 31 and the plurality of first through-slots 32 are connected to form the axial section 172 of the second flow channel 17. The axial section 172 has recesses on both sides of the stator mechanism in the axial direction. The recesses on both sides of the axial section 172 are offset from each other and are recessed toward the interior of the axial section 172 along the axial direction of the stator mechanism. The plurality of second through-slots 33 are connected to form the radial section 171 of the second flow channel 17. In the stator mechanism formed by this molding method, the third flow channel 18 extends from the first end face of the stator mechanism to the second end face. As shown in Figures 2 and 7, to prevent coolant from leaking from the third flow channel 18, the end of the third flow channel 18 corresponding to the second end face of the stator mechanism can be blocked by a plug 15 or other structure. The plug 15 can extend from the second end face of the stator mechanism into the third flow channel 18 and into the radial section 171 of the second flow channel 17. The coolant enters the third flow channel 18 from the end of the third flow channel 18 corresponding to the first end face of the stator mechanism. In a specific implementation, a plurality of first through holes 21 may be provided on the punching sheet A1 , thereby forming a plurality of first flow channels 16 , and the coolant may be sprayed out through the plurality of first flow channels 16 .

[0062] In another embodiment, the stator structure is formed by stacking four types of punching sheets. In addition to the punching sheets A1, A2, and A3, another type is the punching sheet A4.

[0063] FIG8 shows a schematic structural diagram of the punching sheet A4 of the motor provided in the present application. FIG9 shows a schematic cross-sectional diagram of the motor provided in the present application along the axial direction. As shown in FIG8 and FIG9, the punching sheet A4 is provided with a fifth through hole 25. The aperture of the fifth through hole 25 can be the same as that of the first through hole 21. The fifth through hole 25 passes through the punching sheet along the axial direction of the punching sheet. The position of the fifth through hole 25 corresponds to the first through hole 21 in the axial direction of the stator mechanism. The number of the fifth through holes 25 is the same as that of the first through hole 21. When the stator mechanism is specifically formed, a plurality of punching sheets A1, a plurality of punching sheets A2, a plurality of punching sheets A3, a plurality of punching sheets A2, and a plurality of punching sheets A4 are stacked in sequence. The plurality of first through holes 21 and the plurality of fifth through holes 25 are connected to form a first flow channel 16. The first flow channel 16 is divided into two sections, one of which is formed by connecting a plurality of first through holes 21, and the other is formed by connecting a plurality of fifth through holes 25. The two sections are respectively connected to the first liquid outlet 14 and the second liquid outlet 19. In the stator mechanism formed by this molding method, the third flow channel 18 extends from the first end surface of the stator mechanism to the second end surface. Since no through hole corresponding to the fourth through hole 24 is provided on the punching sheet A4, the punching sheet A4 can block the end of the third flow channel 18 close to the second end surface of the stator mechanism, thereby preventing the coolant from leaking from the third flow channel 18.

[0064] Figure 10 shows another possible schematic diagram of the cooling channel inside the stator mechanism of the motor provided in this application. As shown in Figure 10, in another embodiment, the stator mechanism has a first flow channel 16, a second flow channel 17, and a third flow channel 18 that are connected in sequence. The second flow channel 17 includes a radial section 171 and an axial section 172. Different from the embodiment shown in Figure 3, the axial section 172 of the second flow channel 17 is an arc-shaped channel. The stator mechanism is composed of three types of punching sheets stacked together. For ease of description, the three types of punching sheets are referred to as punching sheets B1, B2, and B3, respectively.

[0065] FIG11 shows a schematic structural diagram of the punching sheet B1 of the motor provided in the present application, FIG12 shows a schematic structural diagram of the punching sheet B2 of the motor provided in the present application, and FIG13 shows a schematic structural diagram of the punching sheet B3 of the motor provided in the present application. As shown in FIG11 , the punching sheet B1 is provided with a first through hole 21 and a second through hole 22, and the second through hole 22 is located on the protrusion of the punching sheet B1. As shown in FIG12 , the punching sheet B2 is provided with a third through slot 31 and a third through hole 23, and there are multiple third through slots 31, and the multiple third through slots 31 are arranged at intervals along the circumference of the stator mechanism. The third through slots 31 are arc-shaped, and the third through hole 23 is located on the protrusion of the punching sheet B2. The aperture of the third through hole 23 can be the same as that of the second through hole 22, and the position of the third through hole 23 corresponds to that of the second through hole 22 in the axial direction of the stator mechanism; FIG12 illustrates the case where there are three third through slots 31. As shown in Figure 13, the punching piece B3 is provided with a first through groove 32, a second through groove 33 and a fourth through hole 24. There are multiple first through grooves 32, and the multiple first through grooves 32 are arranged at intervals along the circumference of the stator mechanism. The first through groove 32 is arc-shaped, and the position of the first through groove 32 corresponds to the third through groove 31 in the circumferential direction of the stator mechanism. The fourth through hole 24 is located on the protrusion of the punching piece B3. The aperture of the fourth through hole 24 can be the same as that of the second through hole 22. The position of the fourth through hole 24 corresponds to the second through hole 22 in the axial direction of the stator mechanism. The number of the fourth through holes 24 is the same as that of the first through groove 32. The second through groove 33 is linear, and the number of the second through grooves 33 is the same as that of the first through groove 32. Each second through groove 33 connects a first through groove 32 and a fourth through hole 24 respectively; Figure 13 illustrates the case where there are three first through grooves 32. The number of the third through holes 23 on the punching sheet B2 is the same as the number of the fourth through holes 24 on the punching sheet B3, and the number of the second through holes 22 on the punching sheet B1 is also the same as the number of the fourth through holes 24 on the punching sheet B3; the number of the first through holes 21 on the punching sheet B1 is greater than or equal to the number of the fourth through holes 24 on the punching sheet B3, and in the axial direction of the stator mechanism, each first through groove 32 on the punching sheet B3 corresponds to at least one first through hole 21.

[0066] When forming the stator structure, multiple punching sheets B1, multiple punching sheets B2, multiple punching sheets B3, multiple punching sheets B2, and multiple punching sheets B1 are stacked in sequence, so that multiple first through holes 21 are connected to form a first flow channel 16. The first flow channel 16 is divided into two sections, which respectively connect the first liquid outlet 14 and the second liquid outlet 19; multiple second through holes 22, multiple third through holes 23, and multiple fourth through holes 24 are connected to form a third flow channel 18; multiple third through slots 31, multiple first through slots 32, and multiple second through slots 33 are connected to form a second flow channel 17. Among them, the multiple third through slots 31 and the multiple first through slots 32 are connected to form the axial section 172 of the second flow channel 17, and the multiple second through slots 33 are connected to form the radial section 171 of the second flow channel 17. The second flow channel 17 includes multiple independent axial sections 172, or in other words, the second flow channel 17 includes multiple axial sections 172 that are not connected to each other. Figure 10 illustrates that the second flow channel 17 includes three axial sections 172 that are not connected to each other. The number of third flow channels 18 is the same as the number of axial segments 172. Each axial segment 172 is connected to a third flow channel 18 via a radial segment 171. Coolant can enter the stator mechanism through multiple third flow channels 18 and enter different axial segments 172 through different radial segments 171, and then be ejected from the first flow channel 16. In the stator mechanism formed by this molding method, the third flow channel 18 extends from the first end face of the stator mechanism to the second end face. As shown in FIG2 , to prevent coolant from leaking from the third flow channel 18, the end of the third flow channel 18 corresponding to the second end face of the stator mechanism can be blocked by a plug 15 or other structure. The plug 15 can extend from the second end face of the stator mechanism into the third flow channel 18. The plug 15 can extend into the third flow channel 18 close to the radial segment 171 of the second flow channel 17. Coolant enters the third flow channel 18 from the end of the third flow channel 18 corresponding to the first end face of the stator mechanism.

[0067] Figure 14 shows another possible schematic diagram of the cooling channels within the stator mechanism of the motor provided herein. As shown in Figure 14, in another embodiment, the stator mechanism comprises a first channel 16, a second channel 17, and a third channel 18, which are sequentially connected. The second channel 17 comprises a radial section 171 and an axial section 172. Unlike the embodiment shown in Figure 3, the axial section 172 of the second channel 17 comprises a plurality of first axial sections 1721 and a plurality of second axial sections 1722. The plurality of first axial sections 1721 are spaced apart in the circumferential direction of the stator mechanism, and the second axial sections 1722 extend along the circumferential direction of the stator mechanism. Adjacent first axial sections 1721 are connected through the second axial sections 1722. Specifically, the first axial segment 1721 has a head end and a tail end in the axial direction of the stator mechanism. In the circumferential direction of the stator mechanism, the head end of the first axial segment 1721 is connected to the head end of the adjacent first axial segment 1721 located on one side of the first axial segment 1721 through the second axial segment 1722, and the tail end of the first axial segment 1721 is connected to the tail end of the adjacent first axial segment 1721 located on the other side of the first axial segment 1721 through the second axial segment 1722. Taking three adjacent first axial segments 1721 as an example, the head end of the first first axial segment 1721 is connected to the head end of the second first axial segment 1721 via a second axial segment 1722, and the tail end of the second first axial segment 1721 is connected to the tail end of the third first axial segment 1721 via a second axial segment 1722. Similarly, it can be understood that the axial segments 172 of the second flow channel 17 are serpentine in the circumferential direction of the stator mechanism and annular in the axial direction of the stator mechanism. The first flow channel 16 is connected to the second axial segment 1722, thereby connecting to the second flow channel 17. The stator mechanism is composed of four types of stacked punchings. For ease of description, the four types of punchings are referred to as punchings C1, C2, C3, and C4, respectively.

[0068] Figure 15 shows a schematic structural diagram of the punching sheet C1 of the motor provided by the present application, Figure 16 shows a schematic structural diagram of the punching sheet C2 of the motor provided by the present application, Figure 17 shows a schematic structural diagram of the punching sheet C3 of the motor provided by the present application, and Figure 18 shows a schematic structural diagram of the punching sheet C4 of the motor provided by the present application. As shown in Figure 15, the punching sheet C1 is provided with a first through hole 21 and a second through hole 22, and the second through hole 22 is located on the protrusion of the punching sheet C1. As shown in Figure 16, the punching sheet C2 is provided with a third through slot 31 and a third through hole 23, and there are multiple third through slots 31, and the multiple third through slots 31 are arranged at intervals along the circumference of the stator mechanism. The third through slots 31 are arc-shaped, and the third through hole 23 is located on the protrusion of the punching sheet C2. The aperture of the third through hole 23 can be the same as that of the second through hole 22, and the position of the third through hole 23 corresponds to that of the second through hole 22 in the axial direction of the stator mechanism. As shown in Figure 17, the punching piece C3 is provided with a first through groove 32 and a fourth through hole 24. There are multiple first through grooves 32, and the multiple first through grooves 32 are arranged at intervals along the circumference of the stator mechanism. The first through grooves 32 are arc-shaped. The positions of the first through grooves 32 and the third through grooves 31 are offset from each other in the circumferential direction of the stator mechanism. The fourth through hole 24 is located on the protrusion of the punching piece C3. The aperture of the fourth through hole 24 can be the same as that of the second through hole 22. The position of the fourth through hole 24 corresponds to the second through hole 22 in the axial direction of the stator mechanism. As shown in Figure 18, the punching piece C4 is provided with a second through groove 33, a fourth through groove 34 and a fifth through hole 25. There are multiple second through grooves 33, and the multiple second through grooves 33 are arranged at intervals along the circumference of the stator mechanism. The second through grooves 33 are arc-shaped, and the position of the second through groove 33 corresponds to the third through groove 31 in the circumferential direction of the stator mechanism. The fifth through hole 25 is located on the protrusion of the punching piece C4. The aperture of the fifth through hole 25 can be the same as that of the second through hole 22. The position of the fifth through hole 25 corresponds to the second through hole 22 in the axial direction of the stator mechanism. The fourth through groove 34 is straight-line, and the fourth through groove 34 connects one of the second through grooves 33 and the fifth through hole 25.

[0069] When forming the stator structure, multiple punches C1, multiple punches C2, multiple punches C3, multiple punches C4, multiple punches C3, multiple punches C2, and multiple punches C1 are stacked in sequence, so that multiple first through holes 21 are connected to form a first flow channel 16, and the first flow channel 16 is divided into two sections, which are respectively connected to the first liquid outlet 14 and the second liquid outlet 19; multiple second through holes 22, multiple third through holes 23, multiple fourth through holes 24 and multiple fifth through holes 25 are connected to form a third flow channel 18; multiple third through slots 31, multiple first through slots 32, multiple second through slots 33 and multiple fourth through slots 34 are connected to form a second flow channel 17. Among them, multiple first through-slots 32 are connected to form a first axial section 1721 of the second flow channel 17, multiple third through-slots 31 are connected to form a second axial section 1722 corresponding to the head end of the first axial section 1721, and multiple second through-slots 33 are connected to form a second axial section 1722 corresponding to the tail end of the first axial section 1721; multiple fourth through-slots 34 are connected to form the radial section 171 of the second flow channel 17. In the stator mechanism formed by this molding method, the third flow channel 18 extends from the first end face of the stator mechanism to the second end face. As shown in Figure 2, to prevent the coolant from leaking from the third flow channel 18, the end of the third flow channel 18 corresponding to the second end face of the stator mechanism can be blocked by a plug 15 or other structure. The plug 15 can extend from the second end face of the stator mechanism into the third flow channel 18 and can extend to the radial section 171 of the second flow channel 17. The coolant enters the third flow channel 18 from the end of the third flow channel 18 corresponding to the first end face of the stator mechanism. The coolant entering the third flow channel 18 flows from the radial section 171 of the second flow channel 17 into the first axial section 1721, then flows toward the front and rear ends of the stator mechanism before entering the second axial section 1722. A portion of the coolant in the second axial section 1722 is ejected from the first flow channel 16, while the remaining portion flows into the next first axial section 1721, continuing to flow within the stator mechanism. The cooling channel within the stator mechanism has a longer path and a larger cooling area, allowing the coolant to more fully exchange heat within the stator mechanism, resulting in a more significant cooling effect.

[0070] In a specific implementation, the punching sheet C1 may be provided with a plurality of first through holes 21, thereby forming a plurality of first flow channels 16, through which the coolant may be ejected. FIG14 illustrates that a plurality of punching sheets form a third flow channel 18. In addition, a plurality of punching sheets may form a plurality of third flow channels 18, and each third flow channel 18 may be connected to a first axial segment 1721 via a radial segment 171.

[0071] The above lists several possible cooling channel forms and corresponding punching sheet types inside the stator mechanism for the purpose of facilitating understanding of the technical solution of the present application. It can be understood that the cooling channel forms and corresponding punching sheet types inside the stator mechanism are not limited to the above embodiments.

[0072] In a specific implementation, multiple ear portions 12 can be provided with a third flow channel 18. According to actual needs, these third flow channels 18 do not all need to pass coolant. For example, a part of the third flow channels 18 can pass coolant, and another part of the third flow channels 18 can serve as connecting holes for connecting the stator mechanism and the shell. During the specific connection, connecting parts such as pins can be fixedly connected in the third flow channels 18 serving as connecting holes, and the pins are fixedly connected to the shell, thereby realizing a fixed connection between the stator mechanism and the shell.

[0073] In this application, "at least one" means one or more, and "more" means two or more. "And / or" describes the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone, where A and B can be singular or plural. In the text description of this application, the character " / " generally indicates that the previous and next associated objects are in an "or" relationship; in the formula of this application, the character " / " indicates that the previous and next associated objects are in a "division" relationship. "Including at least one of A, B and C" can mean: including A; including B; including C; including A and B; including A and C; including B and C; including A, B and C.

[0074] It is understood that the various numbers used in the embodiments of this application are merely for ease of description and are not intended to limit the scope of the embodiments of this application. The order of the sequence numbers of the above-mentioned processes does not necessarily imply a specific order of execution; the order of execution of the processes should be determined by their functions and inherent logic.

[0075] The above is only a specific implementation method of the present application, but the protection scope of the present application is not limited thereto. Any changes or replacements that can be easily thought of by any technician familiar with this technical field within the technical scope disclosed in this application should be covered by the protection scope of the present application.

Claims

1. A motor, characterized in that: It comprises a shell, a stator mechanism and a rotor mechanism, wherein the stator mechanism is fixedly arranged in the shell, the rotor mechanism is rotatably arranged in the stator mechanism, and the shell has a liquid supply channel; The stator mechanism is provided with a first liquid outlet and a second liquid outlet at two ends of the stator mechanism in the axial direction, respectively; The stator mechanism has a first flow channel, and two ends of the first flow channel are respectively connected to the first liquid outlet and the second liquid outlet; The stator mechanism includes a punching sheet, the axial direction of the punching sheet coincides with the axial direction of the stator mechanism, the punching sheet includes a first through groove and a second through groove, the first through groove extends along the circumferential direction of the punching sheet, and the first through groove penetrates the punching sheet along the axial direction of the punching sheet, the second through groove extends along the radial direction of the punching sheet, and the second through groove penetrates the punching sheet along the axial direction of the punching sheet; the first through groove and the second through groove are connected to form a second flow channel, and the first flow channel is connected to the liquid supply flow channel through the second flow channel.

2. The motor according to claim 1, characterized in that The second flow channel includes a radial section and an axial section, the radial section is arranged along the radial direction of the stator mechanism, and one end of the radial section is communicated with the liquid supply flow channel; the axial section is arranged along the axial direction of the stator mechanism, and the axial section extends along the circumferential direction of the stator mechanism, and the first flow channel is communicated with the other end of the radial section through the axial section; The first through-slot forms the axial section, and the second through-slot forms the radial section.

3. The motor according to claim 2, characterized in that In the axial direction of the stator mechanism, the size of the axial segment is larger than the size of the radial segment.

4. The motor according to claim 2 or 3, characterized in that: The axial section is a circular annular channel.

5. The motor according to claim 2 or 3, characterized in that: The axial section is an arc-shaped channel.

6. The motor according to claim 2 or 3, characterized in that: The axial segments include a plurality of first axial segments and a plurality of second axial segments, wherein the plurality of first axial segments are spaced apart in the circumferential direction of the stator mechanism, and the second axial segments extend along the circumferential direction of the stator mechanism, and adjacent first axial segments are connected through the second axial segments; At least one of the first axial segments is communicated with the liquid supply channel through the radial segment, and the first channel is communicated with the first axial segment through the second axial segment.

7. The motor according to claim 6, characterized in that The first axial segment has a head end and a tail end in the axial direction of the stator mechanism. In the circumferential direction of the stator mechanism, the head end of the first axial segment is connected to the head end of the adjacent first axial segment located on one side of the first axial segment through the second axial segment, and the tail end of the first axial segment is connected to the tail end of the adjacent first axial segment located on the other side of the first axial segment through the second axial segment.

8. The motor according to any one of claims 1 to 7, characterized in that: The stator mechanism comprises a plurality of punching sheets arranged in a stacked manner; Some of the adjacent punching sheets are provided with a first through hole, and the first through hole penetrates the punching sheet along the axial direction of the punching sheet; Some of the adjacent punching sheets are provided with a third through groove, the third through groove extends along the circumference of the punching sheet, and the third through groove penetrates the punching sheet along the axial direction of the punching sheet, and the third through groove corresponds to the first through groove in the axial direction of the punching sheet; Some of the adjacent punching sheets are provided with the first through groove and the second through groove; A plurality of the first through holes are connected to form the first flow channel; The plurality of first through grooves, the plurality of second through grooves and the plurality of third through grooves are connected to form the second flow channel.

9. The motor according to claim 8, characterized in that The punching sheet provided with the first through hole is provided with a second through hole, the second through hole penetrates the punching sheet along the axial direction of the punching sheet, and the second through hole and the first through hole are spaced apart in the radial direction of the punching sheet; The punching sheet provided with the third through slot is provided with a third through hole, the third through hole penetrates the punching sheet along the axial direction of the punching sheet, the third through hole corresponds to the second through hole in the axial direction of the punching sheet, and the third through hole and the third through slot are spaced apart in the radial direction of the punching sheet; The punching sheet provided with the first through slot and the second through slot is provided with a fourth through hole, the fourth through hole penetrates the punching sheet along the axial direction of the punching sheet, the fourth through hole corresponds to the second through hole in the axial direction of the punching sheet, and the fourth through hole is connected with the first through slot through the second through slot; The plurality of the second through holes, the plurality of the third through holes and the plurality of the fourth through holes are connected to form a third flow channel; One end of the third flow channel is communicated with the liquid supply flow channel, and the first flow channel is communicated with the other end of the third flow channel through the second flow channel to be communicated with the liquid supply flow channel.

10. The motor according to claim 8 or 9, characterized in that Some of the adjacent punches are provided with a fifth through hole, which penetrates the punch along the axial direction of the punch. The fifth through hole corresponds to the first through hole in the axial direction of the punch, and a plurality of the first through holes and a plurality of the fifth through holes form the first flow channel.

11. The motor according to any one of claims 1 to 10, characterized in that: The stator mechanism comprises a stator body, the stator body is a hollow cylindrical structure, and the rotor mechanism is coaxially arranged with the stator body; The first flow channel and the second flow channel are respectively arranged inside the stator body.

12. The motor according to claim 11, characterized in that The stator body has an outer circumferential surface and an inner circumferential surface which are opposite to each other in the radial direction of the stator mechanism, the outer circumferential surface of the stator body is provided with a lug portion, the lug portion extends in the axial direction of the stator mechanism, and the inner circumferential surface of the stator body is provided with a tooth portion, the tooth portion extends in the axial direction of the stator mechanism; The stator mechanism includes a coil winding, and the coil winding is wound around the tooth portion.

13. A powertrain device, characterized in that: It comprises a speed change mechanism, an output shaft and a motor as claimed in any one of claims 1 to 12; The speed change mechanism is used to change the rotation speed of the motor, and the output shaft is connected to the rotor mechanism of the motor through the speed change mechanism.

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