Motor, power assembly and electric vehicle

Abstract

The invention provides a motor, a power assembly and an electric vehicle. A stator of the motor comprises a plurality of stator cores, a plurality of winding slots of the stator penetrate through the stator cores, and each winding slot is used for accommodating a plurality of wires. The plurality of stator cores includes a first core and a second core. One end of each wire is exposed out of one end face of the second iron core. The first runner of the first iron core penetrates through the first iron core in the axial direction of the motor. And one end surface of the second iron core covers the outlet of the first flow channel along the axial direction of the motor. An outlet of the second runner penetrates through one end face of the second iron core, and the second runner is used for communicating an outlet of the first runner with one end face of the second iron core. Outlets of the second flow channels are distributed in the peripheral side of one winding groove. The distance between the outlet of the second flow channel and one winding groove is larger than the distance between the first flow channel and one winding groove in the radial direction of the motor. Through cooperation of different runners in the stator, the risk that the runners are blocked by insulating paint can be reduced under the condition that the cooling effect of the motor is ensured.

Description

Technical Field

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

[0002] The motor is an electromagnetic device that converts or transmits electrical energy based on the law of electromagnetic induction. In the powertrain of an electric vehicle, the motor is used to convert electrical energy into mechanical energy, and then transmit the mechanical energy to the reducer to drive the wheels of the electric vehicle.

[0003] During the operation of the motor, the energy lost by the stator and winding of the motor will gradually turn into heat, causing the temperature of the stator and winding to rise continuously. In order to control the temperature rise of the motor, a cooling channel can be arranged in the stator, and the cooling medium in the cooling channel can be used to take away the heat generated by the stator and winding.

[0004] In addition, in order to improve the insulation performance of the motor, the stator and winding are usually dipped in varnish so that the insulating varnish can penetrate into the winding and the gap between the winding and the winding slot. However, during the drying process of the insulating varnish, the insulating varnish overflowing from the winding slot can easily enter the cooling channel of the stator, causing the cooling channel to be blocked, which will have a negative impact on the cooling effect of the stator and winding. Summary of the invention

[0005] Embodiments of the present application provide a motor, a powertrain, and an electric vehicle.

[0006] In a first aspect, an embodiment of the present application provides a motor, wherein a stator of the motor comprises a plurality of stator cores, a plurality of winding slots of the stator penetrate the plurality of stator cores along the axial direction of the motor, and each winding slot is used to accommodate a plurality of wires.

[0007] The plurality of stator cores include a first core and a second core. One end of the plurality of wires is exposed at an end face of the second core. The first flow channel of the first core passes through the first core, and an end face of the second core along the axial direction of the motor covers the outlet of the first flow channel. The outlet of the second flow channel passes through an end face of the second core, and the second flow channel is used to connect the outlet of the first flow channel with an end face of the second core. The outlet of the second flow channel is distributed on the outer peripheral side of a winding slot. The distance between the outlet of the second flow channel and a winding slot along the radial direction of the motor is greater than the distance between the first flow channel and a winding slot.

[0008] In the embodiment of the present application, when the motor is in a working state, the passage of alternating current through multiple wires in a winding slot will cause resistance loss. The alternating magnetic flux generated after the wires are energized will also cause hysteresis loss and eddy current loss in multiple stator cores, resulting in a continuous increase in the heat generation of the wires and the stator cores. In the embodiment of the present application, the first flow channel is relatively close to a winding slot, shortening the distance between the cooling medium in the first flow channel and the multiple wires, facilitating the conduction of the heat generated by the wires to the first flow channel, and being conducive to improving the heat dissipation efficiency.

[0009] In the embodiment of the present application, one end of multiple wires protrudes from an end face of the second iron core, indicating that an end face of the second iron core is an end face of the stator, and the second iron core is distributed at the ends of multiple stator cores. In order to improve the insulation and heat conduction of the stator and the wires, the stator and the wires are usually subjected to dipping treatment with paint. During the drying process of the insulating paint, part of the insulating paint in a winding slot is likely to overflow to an end face of the second iron core. Since the first flow channel is not distributed in the second iron core and the outlet of the first flow channel is not distributed on an end face of the second iron core, even if the first flow channel is arranged adjacent to a winding slot, the insulating paint overflowing to an end face of the second iron core is difficult to directly flow into the first flow channel.

[0010] However, if there is an axial flow channel in the second iron core, the outlet of an axial flow channel is arranged adjacent to a winding slot, and an axial flow channel is communicated with the first flow channel, which is equivalent to extending the outlet of the first flow channel to an end face of the second iron core, increasing the possibility of blockage caused by the insulating paint flowing into an axial flow channel. In the embodiment of the present application, an end face of the second iron core covers the outlet of the first flow channel along the axial direction of the motor, which means that the projection area of the outlet of the first flow channel on an end face of the second iron core along the axial direction of the motor corresponds to the solid structure of the second iron core, and the solid structure corresponding to the projection area will block the direct outflow of the cooling medium in the first flow channel along the axial direction of the motor, being conducive to reducing the risk of blockage of the flow channel.

[0011] The second flow channel in the embodiment of the present application is used to guide the cooling medium in the first flow channel to flow out from an end face of the second iron core. The outlet of the second flow channel is distributed on the outer peripheral side of a winding slot, and the radial distance between the outlet of the second flow channel and a winding slot is greater than the radial distance between the first flow channel and a winding slot. Under the guidance of the second flow channel, the position where the cooling medium flows out from an end face of the second iron core is relatively far from a winding slot compared with the first flow channel, extending the path of the insulating paint flowing from a winding slot to the outlet of the second flow channel, effectively avoiding the blockage of the cooling medium in the second flow channel at the outlet of the second flow channel, and improving the cooling efficiency. The cooling medium can flow out smoothly from an end face of the second iron core, contributing to the continuous movement of the cooling medium to one end of multiple wires, reducing the risk of local overheating of the wires, and also omitting the oil injection ring, reducing the volume of the motor. In addition, it is also conducive to the recovery and recycling of the cooling medium.

[0012] It can be understood that, to avoid clogging of the second flow channel, it is only necessary to ensure that the outlet of the second flow channel is far from the winding slot, and the radial distance between the remaining part of the second flow channel except the outlet and the winding slot can be adjusted according to actual requirements.

[0013] If only considering the problem of flow channel clogging, another axial flow channel can be separately adopted in the stator, and the other axial flow channel is integrally radially away from a winding slot along the motor. In this case, although the insulating paint in one winding slot is difficult to flow to the outlet of the other axial flow channel, the radial distance between the other axial flow channel and multiple wires is also relatively far, which will have a negative impact on the cooling effect of the wires. In the embodiment of the present application, the distance between the first flow channel and a winding slot is relatively small, and the distance between the outlet of the second flow channel and a winding slot is relatively large. Through the cooperation of the first flow channel and the second flow channel, compared with one axial flow channel or the other axial flow channel, the embodiment of the present application can avoid clogging of the flow channel by the insulating paint overflowing from the winding slot while ensuring the winding cooling effect.

[0014] In one embodiment, a radial slot wall of a winding slot along the radial direction of the motor faces away from the inner circumferential surface of the stator. At least part of the first flow channel and the outlet of the second flow channel are distributed on both sides of a radial slot wall of a winding slot along the radial direction of the motor.

[0015] In the embodiment of the present application, a radial slot wall of a winding slot refers to an inner slot wall of a winding slot along the radial direction of the motor. The outlet of the second flow channel is distributed on the outer peripheral side of a winding slot, indicating that the outlet of the second flow channel is distributed on the side of a radial slot wall of a winding slot away from the inner circumferential surface of the stator.

[0016] In the embodiment of the present application, at least part of the first flow channel and the outlet of the second flow channel are distributed on both sides of a radial slot wall of a winding slot along the radial direction of the motor, which is equivalent to that at least part of the first flow channel is closer to the inner circumferential surface of the stator relative to a radial slot wall of a winding slot, shortening the distance between the cooling medium of the first flow channel and the wire, which helps to enhance the cooling effect. In addition, multiple winding slots of the stator are arranged at intervals along the circumferential direction of the motor. At least part of the first flow channel and the second flow channel are distributed on different sides of a radial slot wall of a winding slot, which also indicates that at least part of the first flow channel is located between one winding slot and another winding slot, so that the cooling medium of the first flow channel can dissipate heat from the wires in two adjacent winding slots.

[0017] In one embodiment, the distance between the outlet of the second flow channel and a radial slot wall of a winding slot along the radial direction of the motor is greater than the distance between the first flow channel and a radial slot wall of a winding slot.

[0018] In the embodiment of the present application, the radial distance between the outlet of the second flow channel and a radial groove wall of a winding slot is relatively large, which is beneficial to reducing the risk of the second flow channel being blocked by insulating paint.

[0019] In one embodiment, the length of the first iron core along the axial direction of the motor is greater than the length of the second iron core. The length of the first flow channel is greater than the length of the second flow channel.

[0020] In the embodiment of the present application, the first flow channel is distributed in the first iron core, and the second flow channel is distributed in the second iron core. The distance between the first flow channel and a winding slot is relatively small, so that the cooling effect of the first flow channel on multiple wires in a winding slot is better than that of the second flow channel. Therefore, the length of the first flow channel is greater than the length of the second flow channel, and the axial length of the first iron core is greater than the axial length of the second iron core, which expands the part of the wire that can exchange heat with the first flow channel and is beneficial to improving the overall cooling efficiency of the wire.

[0021] In one embodiment, the inlet of the second flow channel penetrates through the other end face of the second iron core, and the other end face of the second iron core along the axial direction of the motor is arranged adjacent to the first iron core. The inlet of the second flow channel is used to communicate with the outlet of the first flow channel, and the opening direction of the inlet of the second flow channel faces the outlet of the first flow channel.

[0022] In the embodiment of the present application, the inlet of the second flow channel penetrates through the other end face of the second iron core. The radial distance between the outlet of the second flow channel and the wire is relatively larger than the radial distance between the first flow channel and the wire. To shorten the average distance between the second flow channel and the wire along the radial direction of the motor, the inlet of the second flow channel can be used to directly communicate with the outlet of the first flow channel. Specifically, the other end face of the second iron core is arranged adjacent to the first iron core, and the opening direction of the inlet of the second flow channel faces the outlet of the first flow channel, reducing the radial distance between the inlet of the second flow channel and the wire, which is convenient for the part of the wire distributed in the second iron core to exchange heat with the second flow channel.

[0023] In one embodiment, the opening direction of the outlet of the second flow channel faces one end of multiple wires, and the inlet of the second flow channel is spaced from the outlet of the first flow channel along the radial direction of the motor.

[0024] Among them, the multiple stator iron cores further include a third iron core, and the third iron core is distributed between the first iron core and the second iron core. The third flow channel of the third iron core penetrates through the third iron core, and the third flow channel is used to communicate the first flow channel and the second flow channel. Along the radial direction of the motor, the third flow channel faces the inlet of the second flow channel from the outlet of the first flow channel.

[0025] In the embodiment of the present application, after the cooling medium flows through the second flow channel, it can be used to continue cooling one end of a plurality of wires. In order to avoid clogging the second flow channel with insulating paint and enable the cooling medium in the second flow channel to move more conveniently to the end of the wire, the opening direction of the outlet of the second flow channel can be directed towards the end of the wire. Under the guidance of the second flow channel, the cooling medium can be concentrated and sprayed onto the end of the wire along the opening direction of the second flow channel.

[0026] In the embodiment of the present application, in order to reduce the flow resistance of the cooling medium in the second flow channel, the opening direction of the inlet of the second flow channel can be coordinated with the opening direction of the outlet of the second flow channel, so that the inlet of the second flow channel is spaced from the outlet of the first flow channel along the radial direction of the motor. In this case, it is necessary to use the third flow channel of the third iron core to connect the first flow channel and the second flow channel. Specifically, the third iron core is distributed between the first iron core and the second iron core along the axial direction of the motor. One end of the third flow channel is connected to the outlet of the first flow channel, and the other end of the third flow channel is connected to the inlet of the second flow channel. The third flow channel can be used to change the flow direction of the cooling medium in the first flow channel and make up for the radial distance between the first flow channel and the second flow channel.

[0027] In one embodiment, the second flow channel includes an axial section and an inclined section. The axial section and the inclined section are arranged adjacent to each other and connected along the axial direction of the motor. The inlet and outlet of the second flow channel are respectively distributed on the axial section and the inclined section. Among them, the extending direction of the axial section is parallel to the axial direction of the motor, and the inclined section extends towards one end of a plurality of wires.

[0028] In the embodiment of the present application, the cooling medium in the third flow channel flows through the axial section and the inclined section of the second flow channel in sequence, and the extending directions of the axial section and the inclined section intersect. The axial section can play a buffering role between the third flow channel and the inclined section. Compared with the scheme in which the inclined section is directly connected to the third flow channel, the axial section in the embodiment of the present application can reduce the turning angle of the flow direction of the cooling medium when it enters the second flow channel from the third flow channel, which is beneficial to reducing the flow resistance of the cooling medium and improving the cooling efficiency.

[0029] In one embodiment, the first groove of the first iron core, the second groove of the second iron core, and the third groove of the third iron core are used to form a winding slot. One circumferential groove wall of the first groove includes a first cooling groove, which is recessed away from a plurality of wires along the circumferential direction of the motor. The gap between the first cooling groove and the plurality of wires is used to form the first flow channel. The first flow channel extends along the axial direction of the motor. The cross-sectional area of the third groove is larger than the cross-sectional area of the first groove, and the gap between the third groove and the plurality of wires is used to form the third flow channel.

[0030] In the embodiment of the present application, one circumferential groove wall of the first groove refers to one groove inner wall of the first groove along the circumferential direction of the motor.

[0031] In an embodiment of the present application, the first groove, the third groove, and the second groove are arranged along the axial direction of the motor to form a winding groove. Among them, the first flow channel is formed in the first cooling groove of the first groove. Specifically, the first cooling grooves are distributed on a circumferential groove wall of the first groove, and the first cooling grooves are recessed away from the wire along the circumferential direction of the motor. The first flow channel communicates with the first groove, so that the cooling medium in the first flow channel can directly contact the surface of the wire, which is beneficial to enhancing the cooling effect. Since the first flow channel is distributed in the first groove, in order to realize that the third flow channel communicates with the first flow channel along the axial direction of the motor, the area of the cross-sectional shape of the third groove needs to be larger than the area of the cross-sectional shape of the first groove, so that a space can be left between the third groove and the wire to form the third flow channel.

[0032] In one embodiment, a circumferential groove wall of the third groove along the axial direction of the motor is aligned with the bottom of the first cooling groove.

[0033] In an embodiment of the present application, since the third groove communicates with the first groove, a circumferential groove wall of the third groove and a circumferential groove wall of the first groove are distributed on the same side of multiple wires in a winding groove. A circumferential groove wall of the third groove is aligned with the bottom of the first cooling groove along the axial direction of the motor, which can prevent the cooling medium in the first flow channel from being blocked by the third groove along the axial direction of the motor, and is convenient for realizing the connection between the third flow channel and the first flow channel.

[0034] In one embodiment, the area of the cross-sectional shape of the second groove is smaller than the area of the cross-sectional shape of the first groove, and a circumferential groove wall of the second groove along the axial direction of the motor is aligned with the notch of the first cooling groove.

[0035] In an embodiment of the present application, since the second groove communicates with the first groove, a circumferential groove wall of the second groove and a circumferential groove wall of the first groove are distributed on the same side of multiple wires in a winding groove. The second groove penetrates through an end face of the second iron core, and it is necessary to prevent the insulating paint overflowing from the second groove from blocking the second flow channel. The area of the cross-sectional shape of the second groove is smaller than the area of the cross-sectional shape of the first groove and the area of the cross-sectional shape of the third groove. A circumferential groove wall of the second groove is aligned with the notch of the first cooling groove along the axial direction of the motor, so that the cooling medium will be blocked by the second iron core after flowing through the outlet of the first flow channel and the inlet of the third flow channel in sequence, and the cooling medium is guided to continue flowing along the radial direction of the motor to the outlet of the third flow channel.

[0036] In one embodiment, the distance between a radial groove wall of the third groove along the radial direction of the motor and multiple wires is greater than or equal to the distance between the second flow channel and multiple wires.

[0037] In an embodiment of the present application, the cooling medium flows from the first flow channel to the second flow channel under the guidance of the third flow channel. To enable the cooling medium to flow radially along the motor in the third flow channel, it is necessary to adjust the radial distance between a radial groove wall facing away from the inner circumferential surface of the stator and the wire in the third groove. The radial distance between a radial groove wall of the third groove and the wire is greater than or equal to the radial distance between the second flow channel and the wire, which is equivalent to the radial length of the circumferential groove wall of the third groove being greater than or equal to the radial distance between the second flow channel and the other radial groove wall of the third groove, so that there is a sufficiently large gap between the third groove and the wire for the cooling medium to flow to the second flow channel.

[0038] In one embodiment, the multiple stator cores include two third cores. One third groove of one third core and the other third groove of the other third core are respectively used to communicate with two adjacent first grooves in the first core. One radial groove wall of each of one third groove and the other third groove includes a second cooling groove, and each second cooling groove is recessed away from the multiple wires radially along the motor. The length of each second cooling groove in the circumferential direction of the motor is greater than the length of each first groove, and the projection of the second cooling groove of one third groove in the axial direction of the motor partially overlaps with the projection of the second cooling groove of the other third groove.

[0039] In an embodiment of the present application, one third core and the other third core are axially distributed between the first core and the second core along the motor. One first groove is used to form a winding groove with one third groove of one third core, and the other first groove is used to form another winding groove with the other third groove of the other third core, and one winding groove and the other winding groove are arranged adjacent to each other.

[0040] In an embodiment of the present application, one radial groove wall of one third groove of one third core and one radial groove wall of the other third groove of the other third core both include second cooling grooves. Taking the second cooling groove of one third groove of one third core as an example: the second cooling groove of one third groove of one third core is recessed away from the wire in one winding groove radially along the motor, and both ends of the second cooling groove of one third groove of one third core extend away from the wire in the circumferential direction of the motor, so that the circumferential length of the second cooling groove of one third groove of one third core is greater than the circumferential length of one first groove. The axial projection of the second cooling groove of one third groove of one third core partially overlaps with the axial projection of the second cooling groove of the other third groove of the other third core, so that the second cooling groove of one third groove of one third core and the second cooling groove of the other third groove of the other third core are axially connected along the motor. It can be understood that in an embodiment of the present application, the projection of the second cooling groove refers to the projection of the area surrounded by the groove wall of the second cooling groove.

[0041] In addition to being able to communicate with the first flow channel in one winding slot, the second flow channel of the embodiment of the present application can also be shared by the first flow channels of two adjacent winding slots. Specifically, the cooling media in one first groove and another first groove flow to the second cooling groove of one third groove of one third iron core and the second cooling groove of another third groove of another third iron core respectively, and the cooling medium in the second cooling groove of another third groove of another third iron core can continue to flow to the second cooling groove of one third groove of one third iron core. In this case, by only connecting one second flow channel with the second cooling groove of one third groove of one third iron core, the two first flow channels can share one second flow channel. The embodiment of the present application is beneficial to reducing the number of second flow channels in the stator and can reduce the risk that the outlet of the second flow channel is blocked by insulating paint.

[0042] In one embodiment, one third iron core includes a fourth groove. Along the axial direction of the motor, a circumferential groove wall of the fourth groove is aligned with the bottom of the first cooling groove, and along the radial direction of the motor, a radial groove wall of the fourth groove is closer to a plurality of wires than the second flow channel is to the plurality of wires. The fourth groove is used for communicating with another third groove of another third iron core along the axial direction of the motor.

[0043] In the embodiment of the present application, the area of the cross-sectional shape of the fourth groove is smaller than the area of the cross-sectional shape of one third groove of one third iron core, which can control the volume for slotting in one third iron core, is beneficial to improving the mechanical strength of the stator, and reduces the negative impact on the electromagnetic performance of the stator. In this case, since a radial groove wall of the fourth groove is closer to a plurality of wires than the second flow channel is to the plurality of wires, that is, the fourth groove cannot directly deliver the cooling medium to the second flow channel, another third iron core can be used as the communication structure between the fourth groove and the second flow channel. Specifically, the fourth groove is used to form another winding slot with another first groove and another third groove of another third iron core. The fourth groove communicates with another third groove of another third iron core along the axial direction of the motor, so that the cooling medium in another first groove can flow into the second flow channel after flowing through the fourth groove and another third groove of another third iron core in sequence.

[0044] In one embodiment, one third iron core includes a fourth flow channel. Along the radial direction of the motor, the fourth flow channel is distributed between a radial groove wall of the fourth groove and the outer peripheral surface of one third iron core. The fourth flow channel is used for communicating with the second cooling groove of another third iron core along the axial direction of the motor.

[0045] In the embodiments of the present application, since the radial distance between one radial groove wall of the fourth groove and the wire is less than the radial distance between the second flow channel and the wire, there is a space between one groove wall of the fourth groove and the outer surface of one third iron core that can be used to arrange the fourth flow channel. The fourth flow channel can be used to receive the cooling medium. The fourth flow channel communicates with the second cooling groove of another third groove of another third iron core, and the second cooling groove of another third groove of another third iron core communicates with the second cooling groove of one third groove of one third iron core, so that the cooling medium received by the fourth flow channel can flow to another first groove and one first groove respectively through the second cooling groove of another third groove of another third iron core and the second cooling groove of one third groove of one third iron core, facilitating the reasonable distribution of the cooling medium.

[0046] In a second aspect, an embodiment of the present application provides a powertrain. The powertrain includes a motor controller, a reducer, and a motor as described in any one of the embodiments of the first aspect. The motor controller is used to supply electrical energy to the motor, and the motor is used to be drivingly connected to the reducer.

[0047] In the embodiments of the present application, applying the motor described in any one of the embodiments of the first aspect to the powertrain can reduce the risk of the flow channels of the motor stator being blocked by insulating paint, enhance the cooling effect of the motor, and is beneficial to improving the working efficiency of the motor and the powertrain.

[0048] In a third aspect, an embodiment of the present application provides an electric vehicle. The electric vehicle includes a power battery and a powertrain as described in the second aspect. The powertrain is used to receive power supply from the power battery and is used to drive the wheels of the electric vehicle.

[0049] In the embodiments of the present application, applying the powertrain described in the second aspect to the electric vehicle is beneficial to improving the safety performance of the electric vehicle. Description of the Drawings

[0050] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required to be used in the embodiments of the present application will be described below.

[0051] Figure 1 is a schematic diagram of an electric vehicle provided by an embodiment of the present application;

[0052] Figure 2 is a schematic diagram of a powertrain provided by an embodiment of the present application;

[0053] Figure 3 is a schematic diagram of a motor provided by an embodiment of the present application;

[0054] Figure 4 is an exploded view of a stator provided by an embodiment of the present application;

[0055] Figure 5 It is a partial schematic diagram of the first iron core and the second iron core provided by an embodiment of the present application;

[0056] Figure 6 It is a schematic diagram of a motor provided by the prior art;

[0057] Figure 7 It is a schematic diagram of a motor provided by the prior art;

[0058] Figure 8 It is a schematic diagram of a motor provided by an embodiment of the present application;

[0059] Figure 9 It is a schematic diagram of a motor provided by an embodiment of the present application;

[0060] Figure 10 It is a schematic diagram of a motor provided by an embodiment of the present application;

[0061] Figure 11 It is an exploded view of a stator provided by an embodiment of the present application;

[0062] Figure 12 It is a partial schematic diagram of the first iron core and the third iron core provided by an embodiment of the present application;

[0063] Figure 13 It is a partial schematic diagram of the second iron core and the third iron core provided by an embodiment of the present application;

[0064] Figure 14 It is a schematic diagram of a stator provided by an embodiment of the present application;

[0065] Figure 15 It is Figure 14 a partial enlarged view of part M in the stator shown;

[0066] Figure 16 It is a partial schematic diagram of the third iron core provided by an embodiment of the present application;

[0067] Figure 17 It is a partial schematic diagram of the third iron core provided by an embodiment of the present application;

[0068] Figure 18 It is a partial schematic diagram of the third iron core provided by an embodiment of the present application;

[0069] Figure 19 It is a schematic diagram of the third iron core provided by an embodiment of the present application;

[0070] Figure 20 It is a schematic diagram of a motor provided by an embodiment of the present application;

[0071] Figure 21 It is a schematic diagram of a motor provided by an embodiment of the present application;

[0072] Figure 22 It is a schematic diagram of the motor provided by an embodiment of the present application;

[0073] Figure 23 It is a schematic diagram of the first iron core and the third iron core provided by an embodiment of the present application;

[0074] Figure 24 It is a schematic diagram of the second iron core and the third iron core provided by an embodiment of the present application;

[0075] Figure 25 It is a schematic diagram of the third iron core provided by an embodiment of the present application. Detailed implementation manners

[0076] Next, the technical solutions in the embodiments of the present application will be described with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments.

[0077] For the convenience of understanding, the relevant technical terms involved in the embodiments of the present application will be explained and described first below.

[0078] Parallel: The parallel defined in the embodiments of the present application is not limited to absolute parallelism. This definition of parallel can be understood as substantially parallel, allowing for situations where it is not absolutely parallel due to influencing factors such as assembly tolerances, design tolerances, and structural flatness.

[0079] Currently, the cooling channels of the motor stator are easily blocked by insulating paint. An embodiment of the present application provides a motor. The stator of the motor includes a plurality of stator iron cores arranged along the axial direction of the motor. A plurality of winding slots of the stator penetrate through the plurality of stator iron cores along the axial direction of the motor, and each winding slot is used to accommodate a plurality of wires of the winding.

[0080] The plurality of stator iron cores include a first iron core and a second iron core. One end of the plurality of wires is exposed on one end face of the second iron core. The first flow channel of the first iron core penetrates through the first iron core. Along the axial direction of the motor, one end face of the second iron core covers the outlet of the first flow channel, that is, the outlet of the first flow channel is spaced from one end face of the second iron core, and the cooling medium in the first flow channel does not directly flow to one end face of the second iron core along the extending direction of the first flow channel. The outlet of the second flow channel penetrates through one end face of the second iron core. The second flow channel is used to connect the outlet of the first flow channel and one end face of the second iron core. The outlet of the second flow channel is distributed on the outer peripheral side of a winding slot. Along the radial direction of the motor, the distance between the outlet of the second flow channel and a winding slot is greater than the distance between the first flow channel and a winding slot.

[0081] In the embodiments of the present application, through the cooperation of different flow channels in the stator, while ensuring the cooling effect of the stator and the winding, the risk of the insulating paint blocking the flow channels can be reduced. The motor provided by the embodiments of the present application can be applied to a powertrain, and the powertrain including the motor provided by the embodiments of the present application can be applied to an electric vehicle.

[0082] Please refer to Figure 1 , Figure 1 which is a schematic diagram of the electric vehicle 1 provided by the embodiments of the present application. In one embodiment, the electric vehicle 1 includes a powertrain 10 and a power battery 20. In the embodiments of the present application, the electric vehicle 1 refers to a wheeled device driven or towed by a power device. The power battery 20 is used to supply power to the powertrain 10, and the power battery 20 can also be referred to as a battery pack. The powertrain 10 is the power source of the electric vehicle 1, and the powertrain 10 is used to drive the wheels 40 of the electric vehicle 1. In one embodiment, the electric vehicle 1 further includes a vehicle frame 30, and the vehicle frame 30 is used to mount the powertrain 10 and the power battery 20. Among them, the vehicle frame 30 is the structural framework of the electric vehicle 1 and can play a role in bearing the loads of the internal and external environments of the electric vehicle 1.

[0083] Please refer to Figure 2 , Figure 2 which is a schematic diagram of the powertrain 10 provided by the embodiments of the present application. In one embodiment, the powertrain 10 includes a motor 11, a motor controller 12, and a reducer 13. The power battery is used to supply power to the motor 11 through the motor controller 12. Specifically, the motor controller 12 is used to convert the direct current provided by the power battery into alternating current and deliver the alternating current to the motor 11. The motor 11 is drivingly connected to the reducer 13 to drive the wheels to rotate. In one embodiment, the motor controller 12 is used to control the motor 11 and the reducer 13.

[0084] Among them, the motor 11 is used to convert electrical energy into mechanical energy and generate a driving torque. In one embodiment, the motor 11 includes a stator 100, a winding 200, a rotor 300, and a motor shaft 400. After alternating current is introduced into the multiple wires 210 of the winding 200, an alternating magnetic flux is generated. The interaction between the alternating magnetic flux generated by the winding 200 and the permanent magnetic flux generated by the rotor 300 causes the rotor 300 to rotate relative to the stator 100. The rotor 300 is fixedly connected to the motor shaft 400, so that the motor shaft 400 rotates following the rotor 300. The stator 100 is rotationally connected to the motor shaft 400, so that the motor shaft 400 can rotate relative to the stator 100 and convert electrical energy into mechanical energy. The output end of the motor shaft 400 is used to transmit mechanical energy to the reducer 13.

[0085] During the operation of the stator and winding of the motor, heat is generated, causing the temperature of the motor to rise. If the motor is not cooled in time, it will affect the working efficiency of the motor and the powertrain, and may also cause damage to the motor due to overheating. To achieve the heat dissipation of the motor, a flow channel is usually provided on the stator. A cooling medium flows through the flow channel, and when the cooling medium flows in the flow channel, it can take away the heat generated by the stator and winding.

[0086] To improve the insulation and heat conductivity of the stator and winding, the stator and winding are usually impregnated with paint. However, during the drying process of the insulating paint, there is a risk that the insulating paint in the winding slot overflows to the stator end face and then flows into the flow channel, causing blockage.

[0087] In the embodiment of the present application, by improving the flow channel of the stator, it is avoided that the outlet of the flow channel close to the winding slot directly penetrates the end face of the stator, increasing the difficulty of the insulating paint overflowing from the winding slot blocking the flow channel, enabling the cooling medium to flow out of the end face of the stator smoothly, which is beneficial to improving the working efficiency of the motor and extending the service life of the motor.

[0088] The following details the motor 11 provided by the embodiment of the present application.

[0089] Please refer to Figures 3 to 5 , Figure 3 which is a schematic diagram of the motor 11 provided by the embodiment of the present application, Figure 4 which is an exploded view of the stator 100 provided by the embodiment of the present application, Figure 5 which is a partial schematic diagram of the first iron core 110 and the second iron core 120 provided by the embodiment of the present application. Among them, Figure 5 the second flow channel 121 in

[0090] refers to the outlet of the second flow channel 121.

[0091] In one embodiment, the stator 100 of the motor 11 includes a plurality of stator iron cores 101. A plurality of winding slots 102 of the stator 100 penetrate through the plurality of stator iron cores 101 along the axial direction O of the motor 11, and each winding slot 102 is used to accommodate a plurality of wires 210.

[0091] The plurality of stator iron cores 101 include a first iron core 110 and a second iron core 120. One end of the plurality of wires 210 is exposed on an end face 122 of the second iron core 120. The first flow channel 111 of the first iron core 110 penetrates through the first iron core 110, and an end face 122 of the second iron core 120 along the axial direction O of the motor 11 covers the outlet of the first flow channel 111. The outlet of the second flow channel 121 penetrates through an end face 122 of the second iron core 120, and the second flow channel 121 is used to connect the outlet of the first flow channel 111 and an end face 122 of the second iron core 120. The outlets of the second flow channel 121 are distributed on the outer peripheral side of a winding slot 102. Along the radial direction R of the motor 11, the distance between the outlet of the second flow channel 121 and a winding slot 102 is greater than the distance between the first flow channel 111 and a winding slot 102.

[0092] In the embodiment of the present application, for the convenience of description, one end face 122 of the second iron core 120 is denoted as the end face 122a of the second iron core 120, and one winding slot 102 is denoted as the winding slot 102a.

[0093] Taking the winding slot 102a among the multiple winding slots 102 as an example. When the motor 11 is in the working state, the alternating current passing through the multiple wires 210 in the winding slot 102a will cause resistive losses, and the alternating magnetic flux generated after the wires 210 are energized will also cause hysteresis losses and eddy current losses in the multiple stator cores 101, resulting in continuous increase in the heat generation of the wires 210 and the stator cores 101. In the embodiment of the present application, the first flow channel 111 is relatively close to the winding slot 102a, shortening the distance between the cooling medium in the first flow channel 111 and the multiple wires 210, facilitating the heat conduction from the wires 210 to the first flow channel 111, and being beneficial to improving the heat dissipation efficiency.

[0094] In the embodiment of the present application, one end of the multiple wires 210 exposes from the end face 122a of the second iron core 120, indicating that the end face 122a of the second iron core 120 is an end face of the stator 100, and the second iron core 120 is distributed at the end of the multiple stator cores 101. During the drying process of the insulating paint, part of the insulating paint in the winding slot 102a is likely to overflow to the end face 122a of the second iron core 120. Since the first flow channel 111 is not distributed in the second iron core 120 and the outlet of the first flow channel 111 is not distributed at the end face 122a of the second iron core 120, even if the first flow channel 111 is arranged adjacent to the winding slot 102a, the insulating paint overflowing to the end face 122a of the second iron core 120 is difficult to directly flow into the first flow channel 111.

[0095] However, if the second iron core 120 has an axial flow channel 1201a as shown in Figure 6 , the outlet of the axial flow channel 1201a is arranged adjacent to the winding slot 102a, and the axial flow channel 1201a is communicated with the first flow channel 111, which is equivalent to extending the outlet of the first flow channel 111 to the end face 122a of the second iron core 120, increasing the possibility of blockage caused by the insulating paint flowing into the axial flow channel 1201a. In the embodiment of the present application, the end face 122a of the second iron core 120 covers the outlet of the first flow channel 111 along the axial direction O of the motor 11, which means that along the axial direction O of the motor 11, the projection area of the outlet of the first flow channel 111 on the end face 122a of the second iron core 120 corresponds to the solid structure of the second iron core 120, and the solid structure corresponding to the projection area will block the direct outflow of the cooling medium in the first flow channel 111 along the axial direction O of the motor 11. Therefore, the second iron core 120 in the embodiment of the present application does not have an axial flow channel 1201a as shown in Figure 6 , which is beneficial to reducing the risk of blockage of the flow channel.

[0096] In the embodiment of the present application, the second flow channel 121 of the second iron core 120 is adopted to replace Figure 6 the axial flow channel 1201a in Figure 6 . The second flow channel 121 is used to guide the cooling medium of the first flow channel 111 to flow out from the end face 122a of the second iron core 120. Different from the axial flow channel 1201a in

[0097] , in the embodiment of the present application, the outlets of the second flow channel 121 are distributed on the outer peripheral side of the winding slot 102a, and the radial distance between the outlets of the second flow channel 121 and the winding slot 102a is greater than the radial distance between the first flow channel 111 and the winding slot 102a. Under the guidance of the second flow channel 121, the position where the cooling medium flows out from the end face 122a of the second iron core 120 is relatively far from the winding slot 102a compared with the first flow channel 111, which prolongs the path of the insulating paint flowing from the winding slot 102a to the outlet of the second flow channel 121, can effectively avoid the blockage of the cooling medium of the second flow channel 121 at the outlet of the second flow channel 121, and improves the cooling efficiency. The cooling medium can flow out smoothly from the end face 122a of the second iron core 120, which helps the cooling medium to continue to move to one end of the plurality of wires 210, reduces the risk of local overheating of the wires 210, and can eliminate the oil injection ring, reducing the volume of the motor 11. In addition, it is also beneficial to realize the recovery and recycling of the cooling medium.

[0098] It can be understood that, to avoid the blockage of the second flow channel 121, it is only necessary to ensure that the outlet of the second flow channel 121 is far from the winding slot 102, and the radial distance between the remaining part of the second flow channel 121 except the outlet and the winding slot 102 can be adjusted according to actual needs. Figure 7 If only considering the blockage problem of the flow channel, the axial flow channel 1201b as shown in

[0099] can be adopted alone, that is, the axial flow channel 1201b is integrally far from the winding slot 102a along the radial direction R of the motor 11. In this case, although it is difficult for the insulating paint in the winding slot 102a to flow to the outlet of the axial flow channel 1201b, the radial distance between the axial flow channel 1201b and the plurality of wires 210 is also relatively far, which will have a negative impact on the cooling effect of the wires 210. In the embodiment of the present application, the distance between the first flow channel 111 and the winding slot 102a is relatively small, and the distance between the outlet of the second flow channel 121 and the winding slot 102a is relatively large. Through the cooperation of the first flow channel 111 and the second flow channel 121, the embodiment of the present application can avoid the blockage of the flow channel by the insulating paint overflowing from the winding slot 102 while ensuring the cooling effect of the winding 200 compared with the axial flow channel 1201a or the axial flow channel 1201b.

[0100] Please continue to refer to Figure 5。In one embodiment, a radial groove wall of the winding groove 102a along the radial direction R of the motor 11 faces away from the inner peripheral surface of the stator 100. At least a part of the first flow channel 111 and the outlet of the second flow channel 121 along the radial direction R of the motor 11 are distributed on both sides of a radial groove wall of the winding groove 102a.

[0101] In the embodiment of the present application, a radial groove wall of the winding groove 102a refers to an inner groove wall of the winding groove 102a along the radial direction R of the motor 11. The outlet of the second flow channel 121 is distributed on the outer peripheral side of the winding groove 102a, indicating that the outlet of the second flow channel 121 is distributed on a side of a radial groove wall of the winding groove 102a away from the inner peripheral surface of the stator 100.

[0102] In the embodiment of the present application, at least a part of the first flow channel 111 and the outlet of the second flow channel 121 are distributed on both sides of a radial groove wall of the winding groove 102a along the radial direction R of the motor 11, which is equivalent to that at least a part of the first flow channel 111 is closer to the inner peripheral surface of the stator 100 relative to a radial groove wall of the winding groove 102a, shortening the distance between the cooling medium in the first flow channel 111 and the wire 210, and helping to enhance the cooling effect. In addition, a plurality of winding grooves 102 of the stator 100 are arranged at intervals along the circumferential direction C of the motor 11, and at least a part of the first flow channel 111 and the second flow channel 121 are distributed on different sides of a radial groove wall of the winding groove 102a, which also indicates that at least a part of the first flow channel 111 is located between the winding groove 102a and another winding groove 102, so that the cooling medium in the first flow channel 111 can dissipate heat from the wires 210 in two adjacent winding grooves 102.

[0103] Please continue to refer to Figure 5 。In one embodiment, the outlets of the first flow channel 111 and the second flow channel 121 along the radial direction R of the motor 11 are distributed on both sides of a radial groove wall of the winding groove 102a. In another embodiment, the outlets of the first flow channel 111 and the second flow channel 121 along the radial direction R of the motor 11 are distributed on the same side of a radial groove wall of the winding groove 102a, and a radial groove wall of the winding groove 102a along the radial direction R of the motor 11, the outlet of the second flow channel 121 and the first flow channel 111 are arranged at intervals.

[0104] Please continue to refer to Figure 5 。In one embodiment, the distance between the outlet of the second flow channel 121 and a radial groove wall of the winding groove 102a along the radial direction R of the motor 11 is greater than the distance between the first flow channel 111 and a radial groove wall of the winding groove 102a.

[0105] In the embodiment of the present application, the radial distance between the outlet of the second flow channel 121 and a radial groove wall of the winding groove 102a is relatively large, which is beneficial to reducing the risk of the second flow channel 121 being blocked by insulating paint.

[0106] Please refer to in combinationFigure 4 and Figure 8 , Figure 8 is a schematic diagram of the motor 11 provided by the embodiment of the present application. In one embodiment, along the axial direction O of the motor 11, the length of the first iron core 110 is greater than the length of the second iron core 120. The length of the first flow channel 111 is greater than the length of the second flow channel 121.

[0107] In the embodiment of the present application, the first flow channel 111 is distributed on the first iron core 110, and the second flow channel 121 is distributed on the second iron core 120. The distance between the first flow channel 111 and the winding slot 102a is relatively small, so that the cooling effect of the first flow channel 111 on the multiple wires 210 in the winding slot 102a is better than that of the second flow channel 121. Therefore, the length of the first flow channel 111 is greater than the length of the second flow channel 121, and the axial length of the first iron core 110 is greater than the axial length of the second iron core 120, which expands the part of the wire 210 that can exchange heat with the first flow channel 111, and is beneficial to improving the overall cooling efficiency of the wire 210.

[0108] Please continue to refer to Figure 8 . In one embodiment, the inlet of the second flow channel 121 penetrates through the other end face of the second iron core 120. Along the axial direction O of the motor 11, the other end face 122 of the second iron core 120 is arranged adjacent to the first iron core 110. The inlet of the second flow channel 121 is used to communicate with the outlet of the first flow channel 111, and the opening direction of the inlet of the second flow channel 121 faces the outlet of the first flow channel 111.

[0109] In the embodiment of the present application, for the convenience of description, the other end face 122 of the second iron core 120 is denoted as the end face 122b of the second iron core 120. The inlet of the second flow channel 121 penetrates through the end face 122b of the second iron core 120.

[0110] In the embodiment of the present application, the radial distance between the outlet of the second flow channel 121 and the wire 210 is relatively larger than the radial distance between the first flow channel 111 and the wire 210. To shorten the average distance between the second flow channel 121 and the wire 210 along the radial direction R of the motor 11, the inlet of the second flow channel 121 can be used to directly communicate with the outlet of the first flow channel 111. Specifically, the end face 122b of the second iron core 120 is arranged adjacent to the first iron core 110, and the opening direction of the inlet of the second flow channel 121 faces the outlet of the first flow channel 111, reducing the radial distance between the inlet of the second flow channel 121 and the wire 210, which is convenient for the part of the wire 210 distributed on the second iron core 120 to exchange heat with the second flow channel 121.

[0111] Please refer to Figure 9 , Figure 9Schematic diagram of the motor 11 provided by the embodiment of the present application. In one embodiment, the opening direction of the outlet of the second flow channel 121 faces one end of a plurality of wires 210, and the inlet of the second flow channel 121 is spaced from the outlet of the first flow channel 111 along the radial direction R of the motor 11. Among them, the plurality of stator cores 101 further include a third core 130, and the third core 130 is distributed between the first core 110 and the second core 120. The third flow channel 131 of the third core 130 penetrates through the third core 130, and the third flow channel 131 is used to connect the first flow channel 111 and the second flow channel 121. Along the radial direction R of the motor 11, the third flow channel 131 faces the inlet of the second flow channel 121 from the outlet of the first flow channel 111.

[0112] In the embodiment of the present application, after the cooling medium flows through the second flow channel 121, it can be used to continue cooling one end of the plurality of wires 210. In the case of avoiding the second flow channel 121 being blocked by insulating paint, in order to enable the cooling medium in the second flow channel 121 to move more conveniently to the end of the wire 210, the opening direction of the outlet of the second flow channel 121 can be oriented towards the end of the wire 210. Under the guidance of the second flow channel 121, the cooling medium can be concentrated and sprayed onto the end of the wire 210 along the opening direction of the second flow channel 121.

[0113] In the embodiment of the present application, in order to reduce the flow resistance of the cooling medium in the second flow channel 121, the opening direction of the inlet of the second flow channel 121 can be coordinated with the opening direction of the outlet of the second flow channel 121, so that the inlet of the second flow channel 121 is spaced from the outlet of the first flow channel 111 along the radial direction R of the motor 11. In this case, it is necessary to use the third flow channel 131 of the third core 130 to connect the first flow channel 111 and the second flow channel 121. Specifically, along the axial direction O of the motor 11, the third core 130 is distributed between the first core 110 and the second core 120, one end of the third flow channel 131 is connected to the outlet of the first flow channel 111, and the other end of the third flow channel 131 is connected to the inlet of the second flow channel 121. The third flow channel 131 can be used to change the flow direction of the cooling medium in the first flow channel 111 and make up for the radial distance between the first flow channel 111 and the second flow channel 121.

[0114] Please refer to Figure 10 , Figure 10 Schematic diagram of the motor 11 provided by the embodiment of the present application. In one embodiment, the second flow channel 121 includes an axial section 1211 and an inclined section 1212. The axial section 1211 and the inclined section 1212 are arranged adjacent to and connected along the axial direction O of the motor 11. The inlet and outlet of the second flow channel 121 are respectively distributed on the axial section 1211 and the inclined section 1212. Among them, the extending direction of the axial section 1211 is parallel to the axial direction O of the motor 11, and the inclined section 1212 extends towards one end of the plurality of wires 210.

[0115] In the embodiment of the present application, the cooling medium in the third flow channel 131 sequentially flows through the axial section 1211 and the inclined section 1212 of the second flow channel 121, and the extending directions of the axial section 1211 and the inclined section 1212 intersect. The axial section 1211 can play a buffering role between the third flow channel 131 and the inclined section 1212. Compared with the solution where the inclined section 1212 is directly communicated with the third flow channel 131, the axial section 1211 in the embodiment of the present application can reduce the turning angle of the flow direction of the cooling medium when it enters the second flow channel 121 from the third flow channel 131, which is beneficial to reducing the flow resistance of the cooling medium and improving the cooling efficiency.

[0116] Please refer to Figure 4 and Figure 10 . In one embodiment, the second iron core 120 includes a plurality of stator punching sheets 123, and the plurality of stator punching sheets 123 are stacked along the axial direction O of the motor 11. By adopting different stacking methods for the plurality of stator punching sheets 123, the axial section 1211 and the inclined section 1212 of the second flow channel 121 can be respectively formed. Specifically, each stator punching sheet 123 includes a plurality of through holes, and each through hole penetrates the stator punching sheet 123 along the axial direction O of the motor 11. Among them, the distances between the plurality of through holes of each stator punching sheet 123 and the axis of each stator punching sheet 123 decrease in sequence along the circumferential direction C of the motor 11. Exemplarily, the plurality of through holes of each stator punching sheet 123 are arranged along an involute. Stacking a part of the stator punching sheets 123 along the axial direction O of the motor 11, the through holes of a part of the stator punching sheets 123 can form the axial section 1211. Stacking each of another part of the stator punching sheets 123 after rotating a specific angle in sequence, the through holes of another part of the stator punching sheets 123 can form the inclined section 1212, and the inclined section 1212 is communicated with the axial section 1211.

[0117] In one embodiment, when a plurality of stator iron cores are fixed by welding, the outer surface of each stator iron core includes a welding groove, and the welding groove of each stator iron core and the flow channel of the stator iron core are arranged at intervals along the radial direction of the motor. The welding grooves of the plurality of stator iron cores are adjacent and communicated along the axial direction of the motor. The welding grooves in the embodiment of the present application facilitate the fixation between the plurality of stator iron cores through welding operations. It can be understood that when a plurality of stator iron cores are fixed by other methods, such as bonding or riveting, in this case, each stator iron core may not include a welding groove.

[0118] Please refer to Figure 11 and Figure 12 , Figure 11 is an exploded view of the stator 100 provided by the embodiment of the present application, Figure 12 is a partial schematic diagram of the first iron core 110 and the third iron core 130 provided by the embodiment of the present application.

[0119] In one embodiment, the first groove 112 of the first iron core 110, the second groove 124 of the second iron core 120, and the third groove 132 of the third iron core 130 are used to form a winding slot 102a. One circumferential groove wall of the first groove 112 includes a first cooling groove 1121. Along the circumferential direction C of the motor 11, the first cooling groove 1121 is recessed away from the plurality of wires 210, and the gap between the first cooling groove 1121 and the plurality of wires 210 is used to form a first flow channel 111. The first flow channel 111 extends along the axial direction O of the motor 11. The area of the cross-sectional shape of the third groove 132 is larger than the area of the cross-sectional shape of the first groove 112, and the gap between the third groove 132 and the plurality of wires 210 is used to form a third flow channel 131.

[0120] In the embodiment of the present application, one circumferential groove wall of the first groove 112 refers to one groove inner wall of the first groove 112 along the circumferential direction C of the motor 11.

[0121] In the embodiment of the present application, the first groove 112, the third groove 132, and the second groove 124 are arranged along the axial direction O of the motor 11 to form a winding slot 102a. Among them, the first flow channel 111 is formed in the first cooling groove 1121 of the first groove 112. Specifically, the first cooling groove 1121 is distributed on one circumferential groove wall of the first groove 112, and the first cooling groove 1121 is recessed away from the wire 210 along the circumferential direction C of the motor 11. The first flow channel 111 is communicated with the first groove 112, so that the cooling medium in the first flow channel 111 can directly contact the surface of the wire 210, which is beneficial to enhancing the cooling effect. Since the first flow channel 111 is distributed in the first groove 112, in order to realize that the third flow channel 131 is axially communicated with the first flow channel 111 along the axial direction O of the motor 11, the area of the cross-sectional shape of the third groove 132 needs to be larger than the area of the cross-sectional shape of the first groove 112, so that a space can be left between the third groove 132 and the wire 210 to form a third flow channel 131.

[0122] Please continue to refer to Figure 12 . In one embodiment, one circumferential groove wall of the third groove 132 along the axial direction O of the motor 11 is aligned with the groove bottom of the first cooling groove 1121.

[0123] In the embodiment of the present application, since the third groove 132 is communicated with the first groove 112, one circumferential groove wall of the third groove 132 and one circumferential groove wall of the first groove 112 are distributed on the same side of the plurality of wires 210 in the winding slot 102a. One circumferential groove wall of the third groove 132 is axially aligned with the groove bottom of the first cooling groove 1121 along the axial direction O of the motor 11, which can avoid the third groove 132 from blocking the cooling medium of the first flow channel 111 along the axial direction O of the motor 11, and is convenient for realizing the communication between the third flow channel 131 and the first flow channel 111.

[0124] Please refer to in combination Figure 12 andFigure 13 , Figure 13 This is a partial schematic diagram of the second iron core 120 and the third iron core 130 provided by the embodiments of the present application. In one embodiment, the area of the cross-sectional shape of the second groove 124 is smaller than the area of the cross-sectional shape of the first groove 112, and a circumferential groove wall of the second groove 124 is aligned with the notch of the first cooling groove 1121 along the axial direction O of the motor 11.

[0125] In the embodiments of the present application, since the second groove 124 communicates with the first groove 112, a circumferential groove wall of the second groove 124 and a circumferential groove wall of the first groove 112 are on the same side of a plurality of wires 210 in the winding groove 102a. The second groove 124 penetrates through the end face 122a of the second iron core 120, and it is necessary to prevent the insulating paint overflowing from the second groove 124 from blocking the second flow channel 121. The area of the cross-sectional shape of the second groove 124 is smaller than the area of the cross-sectional shape of the first groove 112 and the area of the cross-sectional shape of the third groove 132. A circumferential groove wall of the second groove 124 is aligned with the notch of the first cooling groove 1121 along the axial direction O of the motor 11, so that after the cooling medium flows through the outlet of the first flow channel 111 and the inlet of the third flow channel 131 in sequence, it will be blocked by the second iron core 120, and the cooling medium is guided to continue flowing to the outlet of the third flow channel 131 along the radial direction R of the motor 11.

[0126] It should be noted that, to clearly show the structure presented by the laminated arrangement of the second iron core 120 and the first iron core 110 and the laminated arrangement of the second iron core 120 and the third iron core 130, Figure 12 and Figure 13 is equivalent to observing a plurality of stator iron cores from two opposite perspectives. Actually, Figure 12 the winding groove 102a in Figure 13 and the winding groove 102a in

[0127] Please continue to refer to Figure 13 . In one embodiment, the distance between a radial groove wall of the third groove 132 and a plurality of wires 210 along the radial direction R of the motor 11 is greater than or equal to the distance between the second flow channel 121 and a plurality of wires 210.

[0128] In an embodiment of the present application, the cooling medium flows from the first flow channel 111 to the second flow channel 121 under the guidance of the third flow channel 131. To enable the cooling medium to flow radially along the motor 11 in the third flow channel 131, it is necessary to adjust the radial distance between a radial groove wall facing away from the inner circumferential surface of the stator 100 in the third groove 132 and the wire 210. The radial distance between a radial groove wall of the third groove 132 and the wire 210 is greater than or equal to the radial distance between the second flow channel 121 and the wire 210, which is equivalent to the radial length of the circumferential groove wall of the third groove 132 being greater than or equal to the radial distance between the second flow channel 121 and the other radial groove wall of the third groove 132, so that there is a sufficiently large gap between the third groove 132 and the wire 210 for the cooling medium to flow to the second flow channel 121.

[0129] Please refer to Figure 14 and Figure 15 , Figure 14 , which is a schematic diagram of the stator 100 provided by the embodiment of the present application. Figure 15 is Figure 14 a partial enlarged view of the M part in the stator 100 shown in

[0130] In one embodiment, the plurality of stator cores 101 include two third cores 130. One third groove 132 of one third core 130 and the other third groove 132 of the other third core 130 are respectively used to communicate with two adjacent first grooves 112 in the first core 110. One radial groove wall of each of one third groove 132 and the other third groove 132 includes a second cooling groove 1321, and each second cooling groove 1321 is recessed away from the plurality of wires 210 along the radial direction R of the motor 11. The length of each second cooling groove 1321 along the circumferential direction C of the motor 11 is greater than the length of each first groove 112, and the projections of the second cooling grooves 1321 of one third groove 132 and the second cooling grooves 1321 of the other third groove 132 overlap partially along the axial direction O of the motor 11.

[0131] In an embodiment of the present application, for the convenience of description, one third core 130 is denoted as the third core 130a, and the other third core 130 is denoted as the third core 130b. One third groove 132 of the third core 130a is denoted as the third groove 132a, and the other third groove 132 of the third core 130b is denoted as the third groove 132b. The second cooling groove 1321 of the third groove 132a is denoted as the second cooling groove 1321a, and the second cooling groove 1321 of the third groove 132b is denoted as the second cooling groove 1321b. One of the two adjacent first grooves 112 is denoted as the first groove 112a, and the other of the two adjacent first grooves 112 is denoted as the first groove 112b.

[0132] In the embodiment of the present application, the third iron cores 130a and 130b are distributed between the first iron core 110 and the second iron core 120 along the axial direction O of the motor 11. The first groove 112a is used to form a winding slot 102a with the third groove 132a, and the first groove 112b is used to form a winding slot 102b with the third groove 132b. The winding slots 102a and 102b are arranged adjacent to each other.

[0133] In the embodiment of the present application, one radial groove wall of the third groove 132a and one radial groove wall of the third groove 132b both include a second cooling groove 1321. Taking the second cooling groove 1321a of the third groove 132a as an example: the second cooling groove 1321a is recessed along the radial direction R of the motor 11 away from the wire 210 in the winding slot 102a, and both ends of the second cooling groove 1321a extend away from the wire 210 along the circumferential direction C of the motor 11, so that the circumferential length of the second cooling groove 1321a is greater than the circumferential length of the first groove 112a. The axial projection of the second cooling groove 1321a overlaps with the axial projection of the second cooling groove 1321b, so that the second cooling groove 1321a and the second cooling groove 1321b are communicated along the axial direction O of the motor 11. It can be understood that in the embodiment of the present application, the projection of the second cooling groove 1321 refers to the projection of the area surrounded by the groove wall of the second cooling groove 1321.

[0134] In addition to being able to communicate with the first flow channel 111 in the winding slot 102a, the second flow channel 121 in the embodiment of the present application can also be shared by the first flow channels 111 of two adjacent winding slots 102. Specifically, as Figure 15 shown by the two bold dashed lines in, the cooling media in the first groove 112a and the first groove 112b flow to the second cooling groove 1321a and the second cooling groove 1321b respectively, and the cooling medium in the second cooling groove 1321b can continue to flow to the second cooling groove 1321a. In this case, only by connecting one second flow channel 121 with the second cooling groove 1321a can the two first flow channels 111 share one second flow channel 121. The embodiment of the present application is beneficial to reducing the number of the second flow channels 121 in the stator 100 and can reduce the risk that the outlet of the second flow channel 121 is blocked by insulating paint. It can be understood that Figure 15 the bold dashed lines in only schematically show the movement trend of the cooling media in different first flow channels 111 and do not represent that the cooling media can only flow along the bold dashed lines.

[0135] In one embodiment, the third iron cores 130a and 130b have the same structure, and both belong to the same kind of stator iron core 101. The misaligned arrangement of the third groove 132a and the third groove 132b can be realized by rotating and laminating the third iron cores 130a and 130b.

[0136] AsFigure 15 As shown, the cross-sectional shapes of the third groove 132a and the third groove 132b both present a T-shaped structure. Please refer to Figures 16 to 18 , Figure 16 which is a partial schematic view of the third iron core 130 provided by an embodiment of the present application. Figure 17 which is a partial schematic view of the third iron core 130 provided by an embodiment of the present application. Figure 18 which is a partial schematic view of the third iron core 130 provided by an embodiment of the present application. Exemplarily, the cross-section of the third groove 132a and the cross-section of the third groove 132b in the embodiment of the present application may also be other shapes shown by the third groove 132 in Figures 16 to 18 . The cross-section of the third groove 132a and the cross-section of the third groove 132b may also adopt different shapes respectively, as long as the following conditions are met: the third groove 132a can transmit the cooling medium to a radial groove wall of the third groove 132a, the third groove 132b can transmit the cooling medium to a radial groove wall of the third groove 132b, and the second cooling groove 1321a of the third groove 132a communicates with the second cooling groove 1321b of the third groove 132b.

[0137] Please continue to refer to Figure 15 . In one embodiment, the third iron core 130a includes a fourth groove 133. Along the axial direction O of the motor 11, a circumferential groove wall of the fourth groove 133 is aligned with the bottom of the first cooling groove 1121. Along the radial direction R of the motor 11, a radial groove wall of the fourth groove 133 is closer to the plurality of wires 210 than the second flow channel 121 is to the plurality of wires 210. The fourth groove 133 along the axial direction O of the motor 11 is used to communicate with the third groove 132b of the third iron core 130b.

[0138] In the embodiment of the present application, for the convenience of description, the fourth groove 133 of the third iron core 130a is denoted as the fourth groove 133a.

[0139] In an embodiment of the present application, the fourth groove 133a and the third groove 132a are both distributed on the third iron core 130a. The area of the cross-sectional shape of the fourth groove 133a is smaller than the area of the cross-sectional shape of the third groove 132a, which can control the volume used for slotting in the third iron core 130a, is beneficial to improving the mechanical strength of the stator 100, and reduces the negative impact on the electromagnetic performance of the stator 100. In this case, since the distance between a radial groove wall of the fourth groove 133a and the plurality of wires 210 is smaller than the distance between the second flow channel 121 and the plurality of wires 210, that is, the fourth groove 133a cannot directly transport the cooling medium to the second flow channel 121, the third iron core 130b can be used as a communication structure between the fourth groove 133a and the second flow channel 121. Specifically, the fourth groove 133a is used to form a winding slot 102b with the first groove 112b and the third groove 132b. The fourth groove 133a communicates with the third groove 132b along the axial direction O of the motor 11, so that the cooling medium in the first groove 112b can flow through the fourth groove 133a and the third groove 132b in sequence and then flow into the second flow channel 121.

[0140] In one embodiment, the third iron core 130a includes a plurality of third grooves 132a and a plurality of fourth grooves 133a, and the third grooves 132a and the fourth grooves 133a are alternately arranged in sequence along the circumferential direction C of the motor 11.

[0141] In one embodiment, the third iron core 130b includes a plurality of third grooves 132b and a plurality of fourth grooves 133b, and the third grooves 132b and the fourth grooves 133b are alternately arranged in sequence along the circumferential direction C of the motor 11. Along the axial direction O of the motor 11, each third groove 132a of the third iron core 130a is opposite to a fourth groove 133b of the third iron core 130b, and each fourth groove 133a of the third iron core 130a is opposite to a third groove 132b of the third iron core 130b.

[0142] Please refer to Figure 12 、 Figure 13 and Figure 15 . In one embodiment, the third iron core 130a includes a fourth flow channel 134, and the fourth flow channel 134 is distributed between a radial groove wall of the fourth groove 133a and the outer peripheral surface of the third iron core 130a along the radial direction R of the motor 11. The fourth flow channel 134 is used to communicate with the second cooling groove 1321b of the third iron core 130b along the axial direction O of the motor 11.

[0143] In an embodiment of the present application, since the radial distance between a radial groove wall of the fourth groove 133a and the wire 210 is smaller than the radial distance between the second flow channel 121 and the wire 210, there is a space between a groove wall of the fourth groove 133a and the outer surface of the third iron core 130a that can be used to arrange the fourth flow channel 134. The fourth flow channel 134 can be used to receive the cooling medium.

[0144] In the embodiment of the present application, the fourth flow channel 134 communicates with the second cooling groove 1321b of the third iron core 130b, and the second cooling groove 1321b communicates with the second cooling groove 1321a, so that the cooling medium received by the fourth flow channel 134 can flow to the first groove 112b and the first groove 112a through the second cooling groove 1321b and the second cooling groove 1321a respectively, facilitating the reasonable distribution of the cooling medium.

[0145] Please refer to Figure 12 、 Figure 14 and Figure 19 , Figure 19 which is a schematic diagram of the third iron core 130 provided by the embodiment of the present application. In one embodiment, the first iron core 110 further includes a fifth flow channel 113. The fifth flow channel 113 is distributed on the outer surface of the first iron core 110. Along the axial direction O of the motor 11, the projection of the fourth flow channel 134 overlaps with the projection of the fifth flow channel 113, and the fourth flow channel 134 is used to receive the cooling medium of the fifth flow channel 113. In this case, the fourth flow channel 134 can be spaced from the outer surface of the third iron core 130a.

[0146] Please refer to Figure 3 and Figure 20 , Figure 20 which is a schematic diagram of the motor 11 provided by the embodiment of the present application. In one embodiment, the plurality of stator iron cores 101 further include a third iron core 130c. Along the axial direction O of the motor 11, the third iron core 130c and the third iron core 130a are distributed on both sides of the first iron core 110. The motor 11 further includes a motor housing 500, and the motor housing 500 is used to accommodate the stator 100. The motor housing 500 includes a liquid inlet 510. The fourth flow channel 134 of the third iron core 130c is used to receive the cooling medium conveyed by the liquid inlet 510 and to convey the cooling medium to the first flow channel 111. In this case, the fourth flow channel 134 needs to communicate with the outer surface of the third iron core 130a.

[0147] Please refer to Figure 21 , Figure 21Schematic diagram of the motor 11 provided by the embodiment of the present application. In one embodiment, the multiple stator cores 101 include two core groups 103, a third core 130c, and a third core 130d. Each core group 103 includes a first core 110, a third core 130a, a third core 130b, and a second core 120. The third core 130c and the third core 130d are distributed between the two core groups 103. The two core groups 103 are axially symmetric about the third core 130c and the third core 130d. The third flow channel 131 of the third core 130c is used to convey the received cooling medium to the first flow channel 111 of one of the core groups 103, and the third flow channel 131 of the third core 130d is used to convey the received cooling medium to the first flow channel 111 of the other core group 103. The second flow channels 121 of the two core groups 103 are used to convey the cooling medium to both ends of the multiple wires 210 respectively.

[0148] In the embodiment of the present application, through the cooperation of the two core groups 103 and the third core 130c and the third core 130d, the risk that the insulating paint overflowing to the two end faces of the stator 100 clogs the flow channels can be reduced, the flow of the cooling medium remains unobstructed, which helps to improve the working efficiency of the motor 11 and extend the service life of the motor 11.

[0149] Please refer to Figure 22 , Figure 22 Schematic diagram of the motor 11 provided by the embodiment of the present application. In one embodiment, the multiple stator cores 101 include two core groups 103, and the two core groups 103 are arranged adjacent to each other along the axial direction O of the motor 11. The motor housing includes two liquid inlets, and each liquid inlet is used to convey the cooling medium to the fourth flow channel 134 of at least one of the third core 130a or the third core 130b of one core group 103. Along the radial direction R of the motor 11, each liquid inlet is opposite to at least one of the third core 130a or the third core 130b of one core group 103. In this case, the two adjacent first cores 110 in the two core groups 103 can be regarded as one first core 110.

[0150] In the embodiment of the present application, the two liquid inlets can increase the input amount of the cooling medium. Since the slotting volume of the third core 130 is larger than that of the first core 110 and the second core 120, the third core 130c and the third core 130d between the two core groups 103 are omitted in the embodiment of the present application, which is beneficial to improving the overall structural strength and electromagnetic performance of the stator 100.

[0151] In one embodiment, each iron core group 103 may only include one third iron core 130, that is, each iron core group 103 includes a first iron core 110, a third iron core 130a, and a second iron core 120, or each iron core group 103 includes a first iron core 110, a third iron core 130b, and a second iron core 120, as long as it is ensured that the cooling medium in each first flow channel 111 can flow out from the end face of the stator 100.

[0152] Please refer to Figure 23 and Figure 24 , Figure 23 which is a schematic diagram of the first iron core 110 and the third iron core 130 provided by the embodiment of the present application, Figure 24 which is a schematic diagram of the second iron core 120 and the third iron core 130 provided by the embodiment of the present application.

[0153] In one embodiment, the first flow channel 111 may also be distributed between the winding slots 102a and the winding slots 102b. Along the circumferential direction C of the motor 11, the winding slots 102a, the first flow channel 111, and the winding slots 102b are arranged at intervals in sequence. The third iron core 130 includes a third cooling groove 135, and the third cooling groove 135 penetrates through the third iron core 130 along the axial direction O of the motor 11. Along the radial direction R of the motor 11, the third cooling groove 135 is recessed towards the inner circumferential surface of the stator 100, and the bottom of the third cooling groove 135 is distributed between the winding slots 102a and the winding slots 102b. Along the axial direction O of the motor 11, the projection of the third cooling groove 135 overlaps at least partially with the projection of the first flow channel 111 and the projection of the second flow channel 121.

[0154] In the embodiment of the present application, the first flow channel 111 is distributed between the winding slots 102a and the winding slots 102b, so that the cooling medium in the first flow channel 111 can take into account the cooling of the wires in the winding slots 102a and the winding slots 102b, improving the cooling efficiency. Since the first flow channel 111 is spaced from the winding slot 102a, the third iron core 130 may not communicate with the first flow channel 111 by means of the third groove 132. Therefore, the areas of the cross-sectional shapes of the first groove, the second groove, and the third groove may be equal, which is beneficial to reducing the processing difficulty and cost. The third cooling groove 135 of the third iron core 130 is used to form a third flow channel 131. The bottom of the third cooling groove 135 and the first flow channel 111 are both distributed between the winding slots 102a and the winding slots 102b. The axial projection of the third cooling groove 135 overlaps at least partially with the axial projection of the first flow channel 111 and the axial projection of the second flow channel 121, facilitating the connection of the third flow channel 131 with the first flow channel 111 and the second flow channel 121.

[0155] Please continue to refer to Figure 23 and Figure 24。In one embodiment, the minimum width of the third cooling groove 135 along the circumferential direction C of the motor 11 is greater than or equal to the inner diameter of the first flow channel 111 and the inner diameter of the second flow channel 121. In the embodiment of the present application, the axial projection of the third cooling groove 135 can cover the axial projections of the first flow channel 111 and the second flow channel 121, which is beneficial to increasing the volume of the cooling medium that the third cooling groove 135 can transport and reducing the flow resistance of the cooling medium between the first flow channel 111 and the third flow channel 131 and between the second flow channel 121 and the third flow channel 131.

[0156] In one embodiment, the second grooves 124a and 124b of the second iron core 120 are used to form the winding grooves 102a and 102b respectively. The portion between two adjacent circumferential groove walls of the second groove 124a and the second groove 124b is used to cover the first flow channel 111. In the embodiment of the present application, by controlling that there is no flow channel in the second iron core 120 for the cooling medium of the first flow channel 111 to directly flow out along the axial direction O of the motor 11 between the second groove 124a and the second groove 124b, the insulating paint in the second groove 124a and the second groove 124b is effectively prevented from blocking the flow channel.

[0157] Please refer to Figure 25 , Figure 25 , which is a schematic diagram of the third iron core 130 provided by the embodiment of the present application. In one embodiment, when the fifth flow channel of the first iron core is used to transport the cooling medium transported by the motor housing to the third cooling groove 135, the third cooling groove 135 can be spaced from the outer surface of the third iron core 130.

[0158] It can be understood that Figures 23 to 25 the third iron core 130 shown can also be applied to Figure 9 , Figure 10 , Figure 20 , Figure 21 and Figure 22 the structures shown.

[0159] The motor, power assembly and electric vehicle provided by the embodiments of the present application have been introduced in detail above. Specific examples are used in this article to elaborate on the principle and embodiments of the present application. The description of the above embodiments is only used to help understand the method and its core idea of the present application. At the same time, for those of ordinary skill in the art, according to the idea of the present application, there will be changes in the specific embodiments and application scopes. In summary, the content of this specification should not be construed as a limitation to the present application.

Claims

1. A motor, characterized in that: The stator of the motor comprises a plurality of stator cores, a plurality of winding slots of the stator penetrate the plurality of stator cores along the axial direction of the motor, each of the winding slots is used to accommodate a plurality of conductors, and the plurality of stator cores comprises a first core and a second core, wherein: One ends of the multiple wires are exposed at an end face of the second iron core, the first flow channel of the first iron core passes through the first iron core, the one end face of the second iron core covers the outlet of the first flow channel along the axial direction of the motor, the outlet of the second flow channel passes through the one end face of the second iron core, the second flow channel is used to connect the outlet of the first flow channel with the one end face of the second iron core, the outlet of the second flow channel is distributed on the outer peripheral side of one of the winding slots, and the distance between the outlet of the second flow channel and the one winding slot along the radial direction of the motor is greater than the distance between the first flow channel and the one winding slot.

2. The motor according to claim 1, characterized in that A radial slot wall of the winding slot in the radial direction of the motor is away from the inner circumferential surface of the stator, and at least a portion of the first flow channel and an outlet of the second flow channel are distributed on both sides of the radial slot wall of the winding slot in the radial direction of the motor.

3. The motor according to claim 2, characterized in that In the radial direction of the motor, a distance between an outlet of the second flow channel and the radial slot wall of the winding slot is greater than a distance between the first flow channel and the radial slot wall of the winding slot.

4. The motor according to any one of claims 1 to 3, characterized in that: Along the axial direction of the motor, the length of the first iron core is greater than the length of the second iron core, and the length of the first flow channel is greater than the length of the second flow channel.

5. The motor according to any one of claims 1 to 4, characterized in that: The inlet of the second flow channel passes through the other end face of the second iron core, and the other end face of the second iron core is arranged adjacent to the first iron core along the axial direction of the motor. The inlet of the second flow channel is used to connect to the outlet of the first flow channel, and the opening direction of the inlet of the second flow channel is toward the outlet of the first flow channel.

6. The motor according to any one of claims 1 to 4, characterized in that: The opening direction of the outlet of the second flow channel faces the one end of the plurality of wires, and the inlet of the second flow channel is spaced apart from the outlet of the first flow channel along the radial direction of the motor, wherein: The multiple stator cores also include a third core, which is distributed between the first core and the second core. A third flow channel of the third core runs through the third core. The third flow channel is used to connect the first flow channel and the second flow channel. Along the radial direction of the motor, the third flow channel extends from the outlet of the first flow channel toward the inlet of the second flow channel.

7. The motor according to claim 6, characterized in that The first groove of the first iron core, the second groove of the second iron core and the third groove of the third iron core are used to form the winding groove, a circumferential groove wall of the first groove includes a first cooling groove, the first cooling groove is recessed away from the multiple wires along the circumference of the motor, the gap between the first cooling groove and the multiple wires is used to form the first flow channel, the first flow channel extends along the axial direction of the motor, the cross-sectional shape of the third groove has an area greater than the cross-sectional shape of the first groove, and the gap between the third groove and the multiple wires is used to form the third flow channel.

8. The motor according to claim 7, characterized in that A circumferential groove wall of the third groove is aligned with the groove bottom of the first cooling groove along the axial direction of the motor.

9. The motor according to claim 7, characterized in that The cross-sectional area of ​​the second groove is smaller than the cross-sectional area of ​​the first groove, and a circumferential groove wall of the second groove is aligned with the groove opening of the first cooling groove along the axial direction of the motor.

10. The motor according to any one of claims 7 to 9, characterized in that: In the radial direction of the motor, a distance between a radial groove wall of the third groove and the plurality of wires is greater than or equal to a distance between the second flow channel and the plurality of wires.

11. The motor according to claim 10, characterized in that The multiple stator cores include two third cores, one third groove of one third core and another third groove of another third core are respectively used to connect two adjacent first grooves in the first core, the radial groove wall of each of the one third groove and the other third groove includes a second cooling groove, each of the second cooling grooves is away from the multiple wire recesses along the radial direction of the motor, the length of each of the second cooling grooves along the circumferential direction of the motor is greater than the length of each of the first grooves, and the projection of the second cooling groove of the one third groove along the axial direction of the motor partially overlaps with the projection of the second cooling groove of the other third groove.

12. The motor according to claim 11, characterized in that The one third iron core includes a fourth groove, a circumferential groove wall of the fourth groove along the axial direction of the motor is aligned with the groove bottom of the first cooling groove, a radial groove wall of the fourth groove along the radial direction of the motor is at a distance from the multiple wires that is smaller than a distance between the second flow channel and the multiple wires, and the fourth groove along the axial direction of the motor is used to connect to the other third groove of the other third iron core.

13. The motor according to claim 12, characterized in that The one third iron core includes a fourth flow channel, and the fourth flow channel is distributed between the one radial groove wall of the fourth groove and the outer peripheral surface of the one third iron core along the radial direction of the motor, and the fourth flow channel is used to connect the second cooling groove of the other third iron core along the axial direction of the motor.

14. A powertrain, characterized in that: The power assembly includes a motor controller, a reducer and a motor as described in any one of claims 1 to 13, wherein the motor controller is used to provide electrical energy to the motor, and the motor is used to drive and connect to the reducer.

15. An electric vehicle, characterized in that: The electric vehicle comprises a power battery and a powertrain as claimed in claim 14, wherein the powertrain is used to receive power from the power battery and to drive wheels of the electric vehicle.

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