Electric motor with radial oil injection of rotor end plates, power assembly and electric vehicle

Abstract

Provided in the present application are an electric motor with radial oil injection of rotor end plates, a power assembly and an electric vehicle. The electric motor comprises an electric motor shaft and an electric motor rotor, wherein an end face of the electric motor shaft comprises an axial hole, the outer peripheral face of the electric motor shaft comprises a plurality of radial through holes, each radial through hole being in communication with the axial hole. The electric motor rotor comprises a plurality of rotor laminations and at least one end plate, wherein the electric motor shaft passes through a shaft hole of each rotor lamination and a center hole of each end plate, the plurality of rotor laminations are sequentially arranged in the axial direction of the electric motor, one end plate is arranged on the side of one rotor lamination facing away from another rotor lamination, one end plate comprises an end face facing away from one rotor lamination, and one end face comprises a plurality of protrusions, each protrusion comprising a side face facing away from the electric motor shaft, the side face of each protrusion comprising a through hole, and the through hole being configured to communicate with one radial through hole. On the basis of ensuring that the electric motor has good heat dissipation performance, the production cost of the electric motor is reduced.

Description

Motor, powertrain and electric vehicle with radial oil injection on rotor end plate

[0001] This application claims priority to the Chinese patent application filed with the State Intellectual Property Office of China on February 5, 2024, with application number 202410170003.3, and priority to the Chinese patent application entitled "Motor, powertrain and electric vehicle with radial oil injection of rotor end plate", all contents of which are incorporated by reference into this application. Technical Field

[0002] The present application relates to the technical field of motors, and more particularly, to a motor, a powertrain, and an electric vehicle with radial oil injection on a rotor end plate. Background Art

[0003] In recent years, drive motors have been widely used in new energy vehicles. Their high power density and high torque density can improve the range and space utilization of new energy vehicles. Improving the heat dissipation performance of drive motors has become an important way to achieve high torque density and high power density.

[0004] As oil cooling technology gradually becomes the development trend of drive motor heat dissipation, various motor rotor oil-flow topologies are constantly being used to cool the drive motor rotor to achieve the purpose of cooling the rotor core. However, existing drive motors cannot achieve a balance between heat dissipation performance and production costs.

[0005] Summary of the Invention

[0006] The present application provides a motor, a power assembly and an electric vehicle with radial oil injection on a rotor end plate, which reduce the production cost of the motor while ensuring good heat dissipation performance of the motor.

[0007] In a first aspect, a motor with radial oil injection on a rotor end plate is provided, the motor comprising a motor shaft and a motor rotor. The end face of the motor shaft comprises an axial hole, and the outer peripheral surface of the motor shaft comprises a plurality of radial through-holes, each of which is connected to the axial hole. The motor rotor comprises a plurality of rotor punchings and at least one end plate, the motor shaft passing through the axial hole of each rotor punching and the center hole of each end plate. The plurality of rotor punchings are arranged in sequence along the motor axis, with an end plate arranged on the side of a rotor punch facing away from another rotor punching. An end plate comprises an end face facing away from a rotor punching, an end face comprising a plurality of protrusions, each protrusion comprising a side face facing away from the motor shaft, and a side face of each protrusion comprising a through-hole, the through-hole being connected to a radial through-hole.

[0008] In the motor provided by the embodiment of the present application, the cooling oil flows along the inner wall of the axial hole of the motor shaft after entering the axial hole of the motor shaft, and flows into the through hole connected to each radial through hole at the intersection of each radial through hole connected to the axial hole, and is ejected along each through hole to achieve cooling of the rotor core of the motor. In this way, the overall size of the end plate along the axial direction of the motor does not need to be processed too large. It is only necessary to process multiple protrusions on the end face of the end plate away from the rotor core, and process a through hole connected to the radial through hole on the side of each protrusion away from the motor shaft, so as to achieve cooling of the rotor core of the motor. Furthermore, on the basis of ensuring that the motor has good heat dissipation performance, the material used for the end plate is saved, the weight of the motor is reduced, and the production cost of the motor is reduced.

[0009] In one implementation, the motor further includes a motor stator, which includes a stator core and stator windings. The inner wall of the axial hole of the stator core includes a plurality of winding slots extending axially through the stator core, and the stator windings are wound in the plurality of winding slots. The motor rotor is adapted to fit into the axial hole of the stator core, and the through holes on one side of each protrusion along the axial direction of the motor are arranged on a side of one end face of the stator core facing away from the other end face of the stator core.

[0010] The stator windings are wound within the winding slots of the stator core. In other words, the stator windings protrude from the winding slots along the motor's axial direction, and are arranged on the side of one end face of the stator core facing away from the other end face of the stator core. Furthermore, the through-holes on one side face of each protrusion are also arranged on the side of one end face of the stator core facing away from the other end face of the stator core. This allows cooling oil ejected from each through-hole to reach and cool the stator windings, regardless of whether the motor is operating at low or high speed. This reduces the temperature rise of the stator windings, improves the heat dissipation performance of the motor, and improves motor performance, such as power and torque density.

[0011] In one implementation, the multiple protrusions are spaced apart along the circumference of the motor, with the spacing between two adjacent protrusions being greater than or equal to the circumferential dimension of each protrusion. This reduces the area of ​​the end plate's end surface facing away from the rotor core, further conserving end plate material, reducing the motor's weight and production costs.

[0012] In one implementation, the inner wall of the shaft hole of a rotor punching includes at least one protrusion, and the outer circumferential surface of the motor shaft includes at least one groove. Each protrusion on the inner wall of the shaft hole of a rotor punching is configured to engage with a groove of the motor shaft. The multiple protrusions on one end surface of an end plate include at least one balancing protrusion. The projected area of ​​at least one of the multiple protrusions along the motor axis is different from the projected areas of the other protrusions. In the radial direction of the motor, each protrusion on the end surface of an end plate is equidistant from the center hole of the end plate.

[0013] Typically, the protrusions on the inner wall of the shaft hole of the rotor punching and the grooves on the outer peripheral surface of the motor shaft are overfitted or interference fit, causing the center of gravity of the rotor core to deviate from the rotation axis of the motor shaft, resulting in the initial imbalance of the motor rotor. However, the present application reuses the protrusions on one end face of the end plate and balances the initial imbalance of the motor rotor by changing the size of the protrusions on one end face of the end plate. On the one hand, the imbalance of the motor rotor is reduced, and the deweighting efficiency of the initial imbalance of the motor rotor is improved. On the other hand, the production cost of the motor rotor is reduced.

[0014] In one implementation, the projected area of ​​at least one balancing protrusion on an end face of an end plate along the motor axis is smaller than the projected area of ​​other protrusions on an end face of an end plate, and the angle between the line connecting at least one balancing protrusion on an end face of an end plate and the center of the end plate and the line connecting each protrusion on the inner wall of the axial hole of a rotor punching and the center of the rotor punching is less than 90 degrees.

[0015] The imbalance of the motor rotor is reduced by reducing the weight of the side where the protrusion of the inner wall of the rotor punching is located, such as reducing the projected area of ​​the balancing protrusion on the side where the protrusion of the inner wall of the rotor punching is located along the axial direction of the motor.

[0016] In one implementation, the projected area of ​​at least one balancing protrusion on an end face of an end plate along the motor axis is larger than the projected area of ​​other protrusions on an end face of an end plate, and the angle between the line connecting at least one balancing protrusion on an end face of an end plate and the center of the end plate and the line connecting each protrusion on the inner wall of the axial hole of a rotor punching and the center of the rotor punching is greater than 90 degrees and less than 180 degrees.

[0017] The imbalance of the motor rotor is reduced by increasing the weight of the side opposite to the protrusion on the inner wall of the rotor punching, such as increasing the projected area of ​​the balancing protrusion on the side opposite to the protrusion on the inner wall of the rotor punching along the motor axis.

[0018] In one implementation, the size of each protrusion on one end surface of an end plate gradually decreases along the circumference of the motor as the end plate moves away from the rotor sheet. This ensures the strength of each protrusion on one end surface of the end plate while reducing the weight of each protrusion.

[0019] In one implementation, multiple protrusions are connected along the circumference of the motor to form an annular protrusion, and the outer diameter of the annular protrusion is less than or equal to the outer diameter of one end plate. In this way, the processing technology of the multiple protrusions is simplified.

[0020] In one implementation, the distance between the through hole on one side of each protrusion on one end surface of an end plate and the other end surface of the end plate is greater than the axial dimension of the end plate along the motor, so that the cooling oil sprayed from each through hole can be sprayed onto the stator winding.

[0021] In one implementation, the opening of a through-hole on one side of each protrusion on one end surface of an end plate is oriented radially along the motor. Because the stator winding surrounds multiple protrusions along the motor's circumference, cooling oil sprayed from each through-hole toward the stator winding has a shorter and smoother path, regardless of whether the motor is running at low or high speed, thereby improving the heat dissipation efficiency of the stator winding.

[0022] In one implementation, an end plate includes another end surface facing a rotor lamination. This other end surface includes multiple groups of grooves. The multiple groups of grooves are located at different distances from the center hole of the end plate. The distance between each group of grooves and the center hole of an end plate is negatively correlated with the minimum dimension of each group of grooves along the circumference of the motor. Thus, the farther the grooves are from the center hole of an end plate, the greater the flow rate of the cooling oil in the grooves, the greater the turbulence, and the higher the heat transfer coefficient.

[0023] In one implementation, each groove in a set of grooves on the other end surface of one end plate communicates with a radial through-hole and is not connected to a through-hole on one side surface of each protrusion. The size of each groove in the set of grooves along the radial direction of the motor, away from the central axis of the one end plate, increases along the circumference of the motor.

[0024] In this way, the flow rate of the cooling oil flowing through one end of each groove of a group of grooves close to the radial through hole is greater than the flow rate of the cooling oil flowing through the other end of each groove away from the radial through hole, so that one end of each groove can quickly divert the cooling oil at one end of each groove to the other end of each groove.

[0025] In one implementation, each groove in another set of grooves on another end surface of one end plate communicates with a through-hole on one side surface of one protrusion, but not with a radial through-hole. In a radial direction of the motor away from the central axis of one end plate, each groove in another set of grooves decreases in size along the circumference of the motor.

[0026] In this way, along the radial direction of the motor away from the central axis of an end plate, the flow rate of the cooling oil flowing through each groove of the other group of grooves becomes increasingly larger, so that the cooling oil flowing out from the through hole on one side of a protrusion connected to each groove of the other group of grooves is sprayed onto the stator winding, thereby expanding the spray range of the cooling oil flowing out from the through hole on one side of a protrusion, improving the utilization rate of the cooling oil, and further improving the heat dissipation performance of the motor.

[0027] In one implementation, each groove in the further set of grooves on the other end surface of one end plate is not connected to the central hole of one end plate or the through-hole on one side surface of each protrusion. Furthermore, along the radial direction of the motor, the dimensions of both ends of each groove in the further set of grooves along the circumferential direction of the motor are greater than the dimensions of the middle portion of each groove in the further set of grooves along the circumferential direction of the motor.

[0028] In this way, the flow rate of the cooling oil flowing through the middle part of each groove of another group of grooves is greater than the flow rate of the cooling oil flowing through the two ends of each groove, so that the middle part of each groove can quickly divert the cooling oil from one end of each groove to the other end of each groove.

[0029] In one implementation, a rotor punching includes two groups of cooling holes, each group comprising multiple cooling holes, arranged at intervals along the circumference of the motor. Each cooling hole in one group is connected to a through-hole on one side of a protrusion, while each cooling hole in the other group is connected to an axial hole in a rotor punching.

[0030] The cooling oil in each radial through-hole flows into another set of cooling holes in the rotor laminations, then flows through the set of cooling holes in the rotor laminations into the through-holes on one side of each protrusion, where it is ejected out through each through-hole. This not only cools the motor's stator windings, but also the rotor core. This results in a more uniform circumferential temperature distribution around the rotor laminations, avoiding localized hot spots and improving the motor's heat dissipation.

[0031] In a second aspect, a power assembly is provided, which includes a reducer and a motor as described in any one of the first aspect and any possible implementation of the first aspect, wherein the motor shaft of the motor is drivingly connected to the input shaft of the reducer.

[0032] The motor described in the first aspect can take into account both heat dissipation performance and production cost, thereby reducing the cost of the powertrain.

[0033] In a third aspect, an electric vehicle is provided. The electric vehicle includes wheels, a transmission mechanism, and the powertrain as described in the second aspect, wherein the powertrain drives the wheels through the transmission mechanism.

[0034] The motor described in the first aspect can take into account both heat dissipation performance and production costs, and thus the performance of the electric vehicle, such as the cruising range and space utilization of the electric vehicle, can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] FIG1 is a schematic structural diagram of an electric vehicle provided in an embodiment of the present application.

[0036] FIG2 is a schematic structural diagram of a motor provided in an embodiment of the present application.

[0037] FIG3 is a schematic diagram of the exploded structure of the motor shown in FIG2 .

[0038] FIG4 is a schematic cross-sectional view of the motor shown in FIG2 along the motor center axis.

[0039] FIG5 is a schematic structural diagram of a rotor punching in the motor shown in FIG2 .

[0040] FIG6 is a schematic structural diagram of an end plate in the motor shown in FIG3 .

[0041] FIG. 7 is a schematic structural diagram of the end plate shown in FIG. 6 in another direction.

[0042] FIG8 is a schematic cross-sectional view of the end plate shown in FIG6 along the AA direction.

[0043] FIG. 9 is a schematic structural diagram of the end plate shown in FIG. 6 in another direction.

[0044] FIG10 is a schematic structural diagram of the end plate shown in FIG6 in another direction.

[0045] FIG11 is a schematic structural diagram of another end plate provided in an embodiment of the present application.

[0046] FIG. 12 is a schematic structural diagram of the end plate shown in FIG. 11 in another direction.

[0047] FIG13 is a schematic cross-sectional view of the end plate shown in FIG11 along the BB direction.

[0048] FIG. 14 is a schematic structural diagram of the end plate shown in FIG. 11 in another direction.

[0049] FIG15 is a schematic diagram of the exploded structure of another motor provided in an embodiment of the present application.

[0050] FIG16 is a schematic cross-sectional view of the motor shown in FIG15 along the motor center axis.

[0051] FIG17 is a schematic structural diagram of an end plate in the motor shown in FIG15 .

[0052] FIG18 is a schematic structural diagram of the end plate shown in FIG17 in another direction.

[0053] FIG19 is a schematic cross-sectional view of the end plate shown in FIG17 along the CC direction. DETAILED DESCRIPTION

[0054] The technical solution in this application will be described below with reference to the accompanying drawings.

[0055] In the description of the embodiments of the present application, unless otherwise specified, “ / ” means or, for example, A / B can mean A or B; “and / or” in this article is merely a way to describe the association relationship of associated objects, indicating that three relationships can exist, for example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone.

[0056] The terms "upper", "lower", "inside", "outside", etc. in the embodiments of the present application indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they should not be understood as limitations on the present application.

[0057] References to "some embodiments" and the like in this specification mean that a particular feature, structure, or characteristic described in connection with that embodiment is included in one or more embodiments of the present application. Thus, phrases such as "in some embodiments" and the like that appear in different places in this specification do not necessarily refer to the same embodiment, but rather mean "one or more, but not all, embodiments," unless otherwise specifically emphasized. The terms "including," "comprising," "having," and variations thereof mean "including but not limited to," unless otherwise specifically emphasized.

[0058] The terms "equal" and "equal to" used in this application are not strictly equal, but rather fall within an acceptable error range. The terms "parallel" and "perpendicular" are not strictly parallel, but rather fall within an acceptable error range. The terms "perpendicular" and "perpendicular" are not strictly perpendicular, but rather fall within an acceptable error range.

[0059] In the embodiments of this application, the same reference numerals represent the same component or part. In the embodiments of this application, for multiple identical parts, only one of the parts may be labeled with a reference numeral in the drawings as an example. The same reference numerals apply to other identical parts or components. In addition, the sizes and dimensions of the parts shown in the drawings are for illustrative purposes only.

[0060] An embodiment of the present application provides a motor with radial oil injection on a rotor end plate, the motor comprising a motor shaft and a motor rotor. The end face of the motor shaft comprises an axial hole, and the outer peripheral surface of the motor shaft comprises a plurality of radial through holes, each of which is connected to the axial hole. The motor rotor comprises a plurality of rotor punchings and at least one end plate, the motor shaft passing through the axial hole of each rotor punching and the center hole of each end plate, the plurality of rotor punchings being arranged in sequence along the motor axis, an end plate being arranged on the side of a rotor punching facing away from another rotor punching, an end plate comprising an end face facing away from a rotor punching, an end face comprising a plurality of protrusions, each protrusion comprising a side face facing away from the motor shaft, and a side face of each protrusion comprising a through hole, the through hole being used to connect to a radial through hole.

[0061] In the motor provided by the embodiment of the present application, the cooling oil flows along the inner wall of the axial hole of the motor shaft after entering the axial hole of the motor shaft, and flows into the through hole connected to each radial through hole at the intersection of each radial through hole connected to the axial hole, and is ejected along each through hole to achieve cooling of the rotor core of the motor. In this way, the overall size of the end plate along the axial direction of the motor does not need to be processed too large. It is only necessary to process multiple protrusions on the end face of the end plate away from the rotor core, and process a through hole connected to the radial through hole on the side of each protrusion away from the motor shaft, so as to achieve cooling of the motor. Furthermore, on the basis of ensuring that the motor has good heat dissipation performance, the material used for the end plate is saved, the weight of the motor is reduced, and the production cost of the motor is reduced.

[0062] The embodiment of the present application further provides an electric vehicle. The electric vehicle provided in the embodiment of the present application will be described in detail below with reference to FIG1 .

[0063] Figure 1 is a schematic diagram of an electric vehicle according to an embodiment of the present application. As shown in Figure 1 , the electric vehicle includes one or more powertrains 10, batteries 20, and wheels 30. The powertrain 10 receives power from the batteries 20 and drives the wheels 30, converting electrical energy into mechanical energy.

[0064] The electric vehicles provided in the embodiments of the present application include pure electric vehicles, hybrid electric vehicles, extended-range electric vehicles, plug-in hybrid electric vehicles or new energy vehicles, etc. Among them, pure electric vehicles are also called pure electric vehicle / battery electric vehicle, or simply pure EV / battery EV. Hybrid electric vehicles are also called hybrid electric vehicles, or simply HEV. Extended-range electric vehicles are also called range extended electric vehicles, or simply REEV. Plug-in hybrid electric vehicles are also called plug-in hybrid electric vehicles, or simply PHEV. New energy vehicles are also called new energy vehicles, or simply NEV.

[0065] The powertrain 10 includes a motor controller, a motor, and a speed reducer. A battery 20 is connected to the motor controller, which receives DC power from the battery 20 via a DC input interface. The motor controller converts the DC power into AC power and transmits it to the motor winding terminals via an AC output interface. This control allows the motor to start or stop, rotate forward or reverse, increase or decrease speed, increase or decrease driving torque, and increase or decrease braking torque. The output end of the motor shaft transmits power to the electric vehicle's wheels 30 via the speed reducer, providing power to these wheels.

[0066] The structure of the motor 100 provided in the embodiment of the present application is described in detail below with reference to Figures 2 to 19.

[0067] As shown in FIG2 to FIG4, and FIG15, FIG16, the motor 100 includes a motor shaft 110. As shown in FIG4 and FIG16, the end surface 111 of the motor shaft 110 includes an axial hole T 11 , axial hole T 11 The outer peripheral surface 112 of the motor shaft 110 includes a plurality of radial through holes T extending from the end surface 111 of the motor shaft 110 to the inside of the motor shaft 110 along the motor axial direction. 12 , each radial through hole T 12 The motor extends from the outer peripheral surface 112 of the motor shaft 110 to the axial hole T in the radial direction of the motor. 11 That is, each radial through hole T 12 With axial hole T 11 In some embodiments, the plurality of radial through holes T 12 Divided into two groups, the two groups of radial through holes are spaced apart along the motor axis. As shown in Figures 4 and 16, multiple radial through holes T 12 Divided into a group of radial through holes T 12a and another set of radial through holes T 12b Each group of radial through holes includes at least one radial through hole T 12 , each group of radial through holes has multiple radial through holes T 12 Distributed at intervals along the circumference of the motor.

[0068] In some embodiments, the axial hole T 11 The cross-sectional area is larger than each radial through hole T 12 In this way, it is possible to ensure that a sufficient amount of cooling oil flows into the axial hole T of the motor shaft 110. 11 , and along the axial hole T 11 With each radial through hole T 12 The junction flows into each radial through hole T 12 .

[0069] In some embodiments, as shown in Figures 2, 3, and 15, the outer peripheral surface of the motor shaft 110 includes at least one groove G1, which is recessed from the outer peripheral surface 112 of the motor shaft 110 toward the interior of the motor shaft 110, and the size of the groove G1 along the axial direction of the motor is larger than the size of the groove G1 along the circumferential direction of the motor. The groove G1 includes a groove opening and a groove bottom arranged opposite to each other along the radial direction of the motor, and two groove walls arranged opposite to each other along the circumferential direction of the motor. In some embodiments, in order to easily embed the protrusion P1 of the rotor punching described below in the groove G1 to achieve the rotational connection between the motor shaft 110 and the rotor core 121, the size of the two groove walls at one end of the groove G1 along the axial direction of the motor is larger than the size of the two groove walls at the other end. In this way, during the assembly process of other components and the motor shaft 110, one end of the motor shaft 110 can be pushed into the other components along the axial direction of the motor.

[0070] As shown in Figures 2 to 4, 15, and 16, the motor 100 includes a motor rotor 120. The motor rotor 120 includes a rotor core 121. The rotor core 121 includes a plurality of rotor punchings, which are arranged in sequence along the motor axis. In some embodiments, the plurality of rotor punchings can be further divided into multiple groups, with the multiple groups of rotor punchings being arranged in sequence along the motor axis, each group of rotor punchings including at least one rotor punching.

[0071] As shown in Figures 3, 5, and 15, each rotor punching includes an axial hole O1 extending through each rotor punching along the motor axis. The motor shaft 110 passes through the axial hole O1 of each rotor punching, thereby achieving a transmission connection between the motor shaft 110 and the rotor core 121. In some embodiments, as shown in Figures 3, 5, and 15, the inner wall of the axial hole O1 of each rotor punching includes at least one protrusion P1, each protrusion P1 extending from the inner wall of the axial hole O1 toward the center of the axial hole O1. The length of the rotor core 121 along the motor axis is less than the length of the groove G1. Along the motor circumference, the groove G1 and each protrusion P1 form a transition fit or interference fit. In this way, each protrusion P1 is used to fit into a groove G1 of the motor shaft 110.

[0072] In some embodiments, each rotor punching further includes two groups of cooling holes, as shown in FIG5 . The two groups of cooling holes are one group of cooling holes C1 and another group of cooling holes C2. Each group of cooling holes in each rotor punching includes at least one cooling hole. The multiple cooling holes in each group of cooling holes in each rotor punching are distributed around the axial hole O1. Each cooling hole in each rotor punching extends axially through each rotor punching along the motor. In the radial direction of the motor, the distance between the one group of cooling holes C1 and the axial hole O1 of each rotor punching is greater than the distance between the other group of cooling holes C2 and the axial hole O1 of each rotor punching.

[0073] Furthermore, each set of cooling holes in the multiple rotor punchings of rotor core 121 is connected axially to form a set of cooling oil channels. Thus, rotor core 121 includes two sets of cooling oil channels, each of which includes multiple cooling oil channels spaced apart along the motor's axial direction. As shown in Figure 4, the two sets of cooling oil channels are one set of cooling oil channels C1' and the other set of cooling oil channels C2'.

[0074] The motor rotor 120 also includes at least one end plate, as shown in Figures 6 to 14 and Figures 17 to 19, each end plate includes a center hole O2 that passes through each end plate 122 along the axial direction of the motor to achieve a transmission connection between each end plate 122 and the rotor core 121.

[0075] In some embodiments, as shown in Figures 2 to 4, 15, and 16, the motor rotor 120 includes one end plate 122a and another end plate 122b. One end plate 122a is arranged on the side of one of the two rotor punchings facing away from the other rotor punching, and the other end plate 122b is arranged on the side of one of the other two rotor punchings facing away from the other rotor punching. In other words, one end plate 122a and the other end plate 122b are arranged on either side of the rotor core 121. In some embodiments, the motor rotor 120 includes only one of the end plates 122a and 122b. The structure of the end plates of the motor rotor 120 is described in detail below, using one end plate 122a as an example.

[0076] One end plate 122a includes an end face E1 away from one rotor punching and another end face E2 toward one rotor punching. One end face E1 of the end plate 122a includes a plurality of protrusions P2. Each protrusion P2 includes a side face S1 away from the motor shaft 110. One side face S1 of each protrusion P2 includes a through hole T. 21 , through hole T 21 For connecting a radial through hole T 12 .

[0077] In this way, the cooling oil enters the axial hole T of the motor shaft 110. 11 Then, close to the axial hole T of the motor shaft 110 11 The inner wall of the flow, with the axial hole T 11 Each connected radial through hole T 12 The intersection is divided and flows along each radial through hole T 12 Flow into each radial through hole T 12 Connected through hole T 21 , and follow the through hole T 21 The spraying is achieved along the motor toward the stator winding of the motor 100 , so that the circumferential temperature distribution of the motor punching sheets is uniform, local hot spots are avoided, and the heat dissipation effect of the motor is improved.

[0078] The cooling oil enters the axial hole T of the motor shaft 110 11 The rear end is close to the axial hole T of the motor shaft 110 11 The inner wall of the flow, and in the axial hole T 11 Each connected radial through hole T 12 Intersection, along each radial through hole T 12 Flow into each radial through hole T 12 Connected through hole T 21 , and follow each through hole T 21 The cooling effect is achieved by ejecting the heat from the rotor core 121 of the motor 100. In this way, the overall size of the end plate along the motor axis does not need to be processed too large. It is only necessary to process multiple protrusions P2 on the end surface E1 of the end plate away from the rotor core 121, and to process radial through holes T on the side surface S1 of each protrusion P2 away from the motor shaft. 12 Connected through hole T 21 , it is possible to cool the rotor core 121 of the motor 100. Furthermore, on the basis of ensuring that the motor 100 has good heat dissipation performance, the material used for the end plate is saved, the weight of the motor 100 is reduced, and the production cost of the motor 100 is reduced.

[0079] In some embodiments, as shown in FIG. 4 or FIG. 16 , the through hole T of one side surface S1 of each protrusion P2 21 Including connected radial through holes T 211 and axial through hole T 212 , radial through hole T 211 A side surface S1 of each protrusion P2 on an end surface E1 of an end plate 122a extends to the axial through hole T 212 , axial through hole T 212 For connecting a radial through hole T 12 .

[0080] In some embodiments, as shown in FIG9 or FIG14 , the plurality of protrusions P2 are spaced apart along the circumference of the motor, with the spacing between two adjacent protrusions P2 being greater than or equal to the circumferential dimension of each protrusion P2. This reduces the area of ​​the end surface E1 occupied by the plurality of protrusions P2, further conserving material for the end plate, reducing the weight of the motor 100 and lowering the production cost of the motor 100.

[0081] In some embodiments, as shown in FIG. 9 or FIG. 14 , a plurality of protrusions P2 are arranged at equal intervals along the circumference of the motor, thereby simplifying the processing technology of the plurality of protrusions P2 .

[0082] In some embodiments, as shown in FIG10 , along the motor axial direction of an end plate 122a facing away from a rotor sheet, the size of each protrusion P2 on an end surface E1 of an end plate 122a gradually decreases along the motor circumference. This ensures the strength of each protrusion P2 on an end surface of an end plate 122a while reducing the weight of each protrusion P2.

[0083] In some embodiments, the through hole T of one side surface S1 of each protrusion P2 of one end surface E1 of one end plate 122a 21 The distance from the other end face E2 of one end plate 122a is greater than the dimension of one end plate 122a along the motor axis. 21 The sprayed cooling oil can be sprayed onto the stator winding.

[0084] In some embodiments, the through hole T of one side surface S1 of each protrusion P2 of one end surface E1 of one end plate 122a 21 The opening is along the radial direction of the motor. Since the stator winding surrounds multiple protrusions P2 along the circumference of the motor, no matter the motor 100 is at low speed or high speed, each through hole T 21 The cooling oil sprayed to the stator winding has a shorter and smoother path, thereby improving the heat dissipation efficiency of the stator winding.

[0085] A through hole T is formed on one side S1 of each protrusion P2. 21 Including radial through hole T 211 and axial through hole T 212 In the embodiment, the through hole T of one side surface S1 of each protrusion P2 of one end surface E1 of one end plate 122a is 21 The opening along the radial direction of the motor can be understood as follows: along the radial direction of the motor, the radial through hole T 211 A side surface S1 of each protrusion P2 on an end surface E1 of an end plate 122a extends to the axial through hole T 212 .

[0086] In some embodiments, the distance between each protrusion P2 on an end surface E1 of an end plate 122a and the center hole O2 of the end plate 122a along the radial direction of the motor is equal. Furthermore, the distance between a side surface S1 of each protrusion P2 on an end surface E1 of an end plate 122a and the center hole O2 of the end plate 122a along the radial direction of the motor is less than the radius of the end plate 122a.

[0087] In some embodiments, the distance between each protrusion P2 on an end surface E1 of an end plate 122a and the central hole O2 of the end plate 122a along the radial direction of the motor can be designed according to requirements.

[0088] For example, the distance between each protrusion P2 on an end surface E1 of an end plate 122a and the center hole O2 of the end plate 122a along the motor radial direction is designed based on the spatial layout requirements of the various components of the motor 100. This allows full utilization of the internal space of the motor 100 while avoiding interference with the spatial layout of the various components of the motor 100.

[0089] For example, the stator winding of the motor 100 is formed by a flat wire, and the inner layer of flat wire near the stator core shaft hole has a flared mouth. The distance between each protrusion P2 of an end face E1 of an end plate 122a along the radial direction of the motor and the center hole O2 of an end plate 122a can be designed to be small. In this way, a sufficient safety distance can be maintained between the stator winding and each protrusion P2 of an end face E1 of an end plate 122a.

[0090] For another example, if the stator winding of the motor 100 is formed by a circular wire and the inner diameter of the stator winding is small, the distance between each protrusion P2 of an end face E1 of an end plate 122a and the center hole O2 of an end plate 122a along the radial direction of the motor can be designed to be small. In this way, a sufficient safety distance can be maintained between the stator winding and each protrusion P2 of an end face E1 of an end plate 122a.

[0091] In some embodiments, because the protrusion P1 on the inner wall of the axial hole O1 of the rotor punching is overfitted or interference fit with the groove G1 on the outer peripheral surface of the motor shaft 110, the center of gravity of the rotor core 121 deviates from the rotation axis of the motor shaft 110, causing the initial imbalance of the motor rotor 120. Therefore, the present application can reuse the protrusion P2 on one end surface E1 of the end plate and balance the initial imbalance of the motor rotor 120 by changing the size of the protrusion P2 on one end surface E1 of the end plate. In this way, the initial imbalance of the motor rotor 120 is reduced, the deweighting efficiency of the initial imbalance of the motor rotor 120 is improved, and the production cost of the motor rotor 120 is reduced.

[0092] Specifically, the plurality of protrusions P2 on one end surface E1 of an end plate 122a include at least one trimming protrusion P 21 At least one trimming protrusion P among the multiple protrusions P2 along the motor axis 21 The projection area of ​​the protrusion P2 is different from the projection area of ​​the other protrusions P2. In the radial direction of the motor, each protrusion P2 on one end surface E1 of an end plate 122a is at the same distance from the center hole O2 of the end plate 122a. 21 The presence of multiple protrusions P2 on one end surface E1 of an end plate 122a is non-rotationally symmetric about the center of the central hole O2 of the end plate 122a, and at least one balancing protrusion P 21The initial unbalance of the motor rotor 120 can be reduced. In this way, by modifying at least one balancing protrusion P2 of the plurality of protrusions P2 on one end surface E1 of an end plate 122a, 21 The size of the motor rotor 120 is used to reduce the initial imbalance of the motor rotor 120, and the protrusion P2 on one end surface E1 of an end plate 122a is reused, which reduces the weight and time of deweighting the motor rotor 120 and improves the dynamic balancing efficiency of the motor rotor 120.

[0093] In one example, by reducing the weight of the protrusion P2 on the side where the protrusion P1 is located, such as reducing the trim protrusion P on the inner wall of the rotor punching on the side where the protrusion P1 is located, 21 The projected area along the motor axial direction is used to reduce the initial unbalance of the motor rotor 120. In this embodiment, at least one balancing protrusion P on one end surface E1 of an end plate 122a along the motor axial direction is 21 The projection area of ​​the protrusion P2 on one end surface of the end plate 122a is smaller than the projection area of ​​the other protrusion P2 on one end surface of the end plate 122a. 21 The angle between the line connecting the center of an end plate 122a and the line connecting each protrusion P1 on the inner wall of the axial hole O1 of a rotor punching and the center of the rotor punching is less than 90 degrees.

[0094] In one example, by increasing the weight of the protrusion P2 located on the opposite side of the protrusion P1, such as increasing the weight of the trim protrusion P on the opposite side of the protrusion P1 on the inner wall of the rotor punching 21 The projected area along the motor axial direction is used to reduce the initial unbalance of the motor rotor 120. In this embodiment, at least one balancing protrusion P on one end surface E1 of an end plate 122a along the motor axial direction is 21 The projection area of ​​the protrusion P2 on one end surface of the end plate 122a is greater than the projection area of ​​the other protrusion P2 on one end surface of the end plate 122a. 21 The angle between the line connecting the center of an end plate 122a and the line connecting each protrusion P1 on the inner wall of the axial hole O1 of a rotor punching and the center of the rotor punching is greater than 90 degrees and less than 180 degrees.

[0095] For example, the at least one trimming projection P can be changed 21 Changing at least one trimming protrusion P along the circumferential direction or radial direction of the motor 21 The projected area along the motor axis.

[0096] It should be noted that the trim cam P 21 The line connecting the center of an end plate 122a can be understood as the trimming protrusion P 21The line connecting the center of each protrusion P1 and the center of the rotor punching can be understood as the line connecting the center of each protrusion P1 and the center of the rotor punching.

[0097] In some embodiments, multiple protrusions P2 are connected along the circumference of the motor to form an annular protrusion, and the outer diameter of the annular protrusion is less than or equal to the outer diameter of one end plate 122a. This simplifies the processing of the multiple protrusions P2. Furthermore, the smaller the inner diameter of the annular protrusion, the smaller the circumference of the annular protrusion, and the less material the annular protrusion requires.

[0098] In some embodiments, the other end surface E2 of one end plate 122a includes at least one group of grooves, each group of grooves including multiple grooves. The grooves in each group of grooves are spaced apart along the circumference of the motor, and each groove is recessed from the other end surface E2 of one end plate 122a toward the interior of the end plate 122a. In some embodiments, the grooves in each group of grooves are equally spaced along the axial direction of the motor, which simplifies the machining process for each group of grooves and reduces the imbalance of the end plate 122a.

[0099] If the other end surface E2 of an end plate 122a includes multiple groups of grooves, the distances between each group of grooves and the center hole O2 of the end plate 122a are unequal, and the distance between each group of grooves and the center hole O2 of an end plate 122a is negatively correlated with the minimum dimension of each group of grooves along the circumference of the motor. Thus, the farther the grooves are from the center hole O2 of an end plate 122a, the greater the flow rate of the cooling oil in the grooves, the greater the turbulence, and the higher the heat transfer coefficient.

[0100] The structure of each group of grooves on the other end surface E2 of one end plate 122a will be described in detail below with reference to FIG. 6 to FIG. 8 , FIG. 11 to FIG. 13 , and FIG. 17 to FIG. 19 .

[0101] In some embodiments, as shown in FIG6 to FIG8 and FIG11 to FIG13, each groove G of a group of grooves of the other end surface E2 of an end plate 122a is 21 It is connected to the central hole O2 of one end plate 122a and is connected to the through hole T of one side surface S1 of each protrusion P2. 21 In addition, as shown in FIG4 , each groove G of a group of grooves of the other end face E2 21 With a radial through hole T 12 Connectivity.

[0102] Along the radial direction of the motor away from the central axis of one end plate 122a, each groove G of a group of grooves 21 In some embodiments, along the radial direction of the motor away from the central axis of one end plate 122a, each groove G of a group of grooves increases. 21The size of the motor increases gradually along the circumference. In some embodiments, along the radial direction of the motor away from the central axis of one end plate 122a, each groove G of a group of grooves 21 It consists of two parts connected along the radial direction of the motor, each groove G 21 Towards radial through hole T 12 The size of the part along the circumference of the motor is smaller than each groove G 21 The dimensions of the other parts.

[0103] In this way, the cooling oil flows through each groove G of a group of grooves 21 The flow rate at one end is greater than the cooling oil flowing through each groove G 21 The flow rate at the other end of each groove G 21 One end can be each groove G 21 The cooling oil at one end is quickly drained to each groove G 21 The other end of each groove G 21 One end of each groove G 21 Close to radial through hole T 12 One end of each groove G 21 The other end of each groove G 21 Away from the radial through hole T 12 one end.

[0104] In some embodiments, as shown in FIG4 , each groove G of a group of grooves 21 The other end is used to connect to a cooling oil channel of another group of cooling oil channels C2' of the rotor core 121. In this way, each groove G of a group of grooves of an end plate 122a 21 The coolant can flow into one cooling oil channel of another group of cooling oil channels C2 ′ of the rotor core 121 to cool the rotor core 121 .

[0105] In some embodiments, as shown in FIG6 to FIG8 and FIG11 to FIG13, each groove G of another group of grooves of another end surface E2 22 With a radial through hole T 12 Not connected to the through hole T of one side S1 of a protrusion P2 21 Connectivity.

[0106] Along the radial direction of the motor away from the central axis of one end plate 122a, each groove G of the other group of grooves 22 The size of the motor decreases along the circumference. In this way, along the radial direction of the motor away from the central axis of one end plate 122a, the cooling oil flows through each groove G of another group of grooves. 22 The flow rate is getting bigger and bigger, so that each groove G from another set of grooves 22 A through hole T connected to a side surface S1 of a protrusion P2 21The outflowing cooling oil is sprayed onto the stator winding, expanding the through hole T from one side S1 of a protrusion P2. 21 The spraying range of the outflowing cooling oil improves the utilization rate of the cooling oil and further improves the heat dissipation performance of the motor 100.

[0107] In some embodiments, as shown in FIG4 , each groove G of another group of grooves 22 One end of the central hole O2 near one end plate 122a is used to connect to one cooling oil channel of a group of cooling oil channels C1' of the rotor core 121. In this way, the coolant in each cooling oil channel of the group of cooling oil channels C1' of the rotor core 121 can flow into one groove G of another group of grooves of one end plate 122a. 22 , and along a through hole T on a side surface S1 of a protrusion P2 of an end plate 122a 21 The ejection realizes the cooling of the rotor core 121 and the cooling of the stator winding outside the rotor core 121 .

[0108] In some embodiments, as shown in FIG6 to FIG8, and FIG11 to FIG13, each groove G of another group of grooves of another end surface E2 23 The central hole O2 of one end plate 122a and the through hole T of one side S1 of each P2 are connected. 21 None connected.

[0109] Each groove G of another set of grooves along the radial direction of the motor 23 The size of both ends of the motor along the circumference is larger than each groove G of another group of grooves 23 The size of the middle part along the circumference of the motor. In this way, the cooling oil flows through each groove G of another group of grooves. 23 The flow rate of the middle part is greater than the cooling oil flowing through each groove G 23 The flow rate at both ends of each groove G 23 The middle part can be used to connect each groove G 23 The cooling oil at one end is quickly drained to each groove G 23 the other end.

[0110] In some embodiments, as shown in FIG4 , each groove G of another group of grooves 23 One end of the cooling oil channel is connected to another cooling oil channel C2' of the rotor core 121, and each groove G of another group of grooves 23The other end is used to connect to another cooling oil channel of the cooling oil channel group C1' of the rotor core 121. In particular, another cooling oil channel of the cooling oil channel group C2' is arranged adjacent to a cooling oil channel of the cooling oil channel group C2' along the circumference of the motor, and another cooling oil channel of the cooling oil channel group C1' is arranged adjacent to a cooling oil channel of the cooling oil channel group C1' along the circumference of the motor. In this way, the coolant in each cooling oil channel of the cooling oil channel group C2' of the rotor core 121 can flow into one groove G of another group of grooves. 23 , and follow each groove G of another set of grooves 23 The oil flows into one of the cooling oil passages C1 ′ of the rotor core 121 , thereby cooling the rotor core 121 .

[0111] In some embodiments, one set of grooves is arranged between another set of grooves and the central hole O2 of one end plate 122a along the radial direction of the motor. 23 Arranged between two grooves in a group of grooves, or a groove G in another group of grooves along the circumference of the motor 22 Arranged between two grooves of another set of grooves.

[0112] In some embodiments, as shown in FIG. 17 to FIG. 19 , each groove G of another group of grooves on another end surface E2 24 It is connected to the central hole O2 of one end plate 122a and is connected to the through hole T of one side surface S1 of each protrusion P2. 21 Also connected. In addition, each groove G of another group of grooves on the other end face E2 24 With a radial through hole T 12 Also connected.

[0113] In some embodiments, each groove G of a group of grooves is provided along the radial direction of the motor away from the central axis of one end plate 122a. 24 The size of the motor gradually decreases along its circumference.

[0114] In this way, the cooling oil flows through each groove G of another group of grooves along the radial direction of the motor away from the central axis of one end plate 122a. 24 The flow rate is getting bigger and bigger, so that each groove G 24 A through hole T connected to a side surface S1 of a protrusion P2 21 The outflowing cooling oil is sprayed onto the stator winding, expanding the through hole T from one side S1 of a protrusion P2. 21 The spraying range of the outflowing cooling oil improves the utilization rate of the cooling oil and further improves the heat dissipation performance of the motor 100.

[0115] It should be noted that the examples shown in Figures 6 to 8, 11 to 13, and 17 to 19 illustrate three grooves in each group, which should not be construed as limiting the present application. Furthermore, the plurality of protrusions P2, one group of grooves, another group of grooves, yet another group of grooves, and yet another group of grooves included in each end plate of the motor rotor 120 may be implemented in combination or separately, and this application does not impose any limitations thereon.

[0116] In some embodiments, the structures of one end plate 122a and the other end plate 122b are the same, which simplifies the processing technology of the end plate of the motor rotor 120 and reduces the production cost of the end plate of the motor rotor 120.

[0117] In one example, one end plate 122a and the other end plate 122b respectively include the plurality of protrusions P2, a group of grooves, another group of grooves, and another group of grooves as described above. In addition, each groove G of the group of grooves of one end plate 122a along the motor axis is 21 and one groove G of another set of grooves of the other end plate 122b 23 Align.

[0118] In this example, as shown in FIG. 4 , the coolant is injected into the axial hole T of the motor shaft 110 . 11 Afterwards, under the action of the centrifugal force of the motor 100, the coolant flows along the axial hole T of the motor shaft 110. 11 The inner surface of the motor shaft 110 is provided with a portion of the coolant. 12a An axial hole T 11 With a radial through hole T 12 The intersection flows into one groove G of a group of grooves of an end plate 122a. 21 , flows along another set of cooling oil channels C2' of the rotor core 121 into one groove G in another set of grooves of the other end plate 122b 23 Then, one groove G in another set of grooves of the other end plate 122b is 23 The coolant in the rotor core 121 flows along a group of cooling oil channels C1' into a groove G in another group of grooves of an end plate 122a. 22 , and along a through hole T of a protrusion P2 on an end surface E1 of an end plate 122a 21 Another part of the coolant is sprayed out in another axial hole T of the motor shaft 110. 11 With another set of radial through holes T 12b A radial through hole T 12 The intersection flows into one groove G of a group of grooves of the other end plate 122b 21 , flows along another set of cooling oil channels C2' of the rotor core 121 into one groove G in another set of grooves of an end plate 122a23 Then, one groove G in another set of grooves of one end plate 122a is 23 The coolant in the rotor core 121 flows along a group of cooling oil channels C1' into one groove G in another group of grooves of the other end plate 122a. 22 , and along the through hole T of a protrusion P2 on one end surface E1 of the other end plate 122b 21 Then, the heat dissipation of the motor 100 is achieved.

[0119] In another example, one end plate 122a and the other end plate 122b respectively include another set of grooves as described above. In addition, each groove G of the another set of grooves of one end plate 122a along the motor axis is 24 and one groove G of another set of grooves of the other end plate 122b 24 Staggered arrangement.

[0120] As shown in FIG16 , the coolant is injected into the axial hole T of the motor shaft 110. 11 Afterwards, under the action of the centrifugal force of the motor 100, the coolant flows along the axial hole T of the motor shaft 110. 11 The inner surface of the motor shaft 110 is provided with a portion of the coolant. 12a An axial hole T 11 With a radial through hole T 12 The intersection flows into a groove G in another set of grooves of an end plate 122a. 24 , and along a through hole T of a protrusion P2 on an end surface E1 of an end plate 122a 21 Another part of the coolant is sprayed out in another axial hole T of the motor shaft 110. 11 With another set of radial through holes T 12b A radial through hole T 12 The intersection flows into a groove G in another set of grooves of another end plate 122b 24 , and along the through hole T of a protrusion P2 on one end surface E1 of the other end plate 122b 21 Then, the heat dissipation of the motor 100 is achieved.

[0121] In some embodiments, the structures of one end plate 122a and the other end plate 122b are different, so as to reduce the weight of the end plates of the motor rotor 120.

[0122] In one example, one end surface E1 of an end plate 122a includes a plurality of protrusions P2, and the other end surface E2 of an end plate 122a includes a group of grooves G. 21 and another set of grooves G 22 The end surface of the other end plate 122b facing the rotor core 121 includes another set of grooves G21 .

[0123] In another example, the other end surface E2 of one end plate 122a includes a set of grooves G 21 The end surface of the other end plate 122b facing away from the rotor core 121 includes a plurality of protrusions P2, and the end surface of the other end plate 122b facing the rotor core 121 includes another set of grooves G 22 .

[0124] In another example, one end surface E1 of an end plate 122a includes a plurality of protrusions P2, and another end surface E2 of an end plate 122a includes another set of grooves G. 22 The end surface of the other end plate 122b facing the rotor core 121 includes another set of grooves G 21 .

[0125] In this example, each cooling hole of a group of cooling holes C1 of one rotor punching sheet of the two rotor punching sheets is used to connect to a through hole T of a side surface S1 of a protrusion P2 of an end plate 122a. 21 , each cooling hole of the other group of cooling holes C2 is used to connect to the axial hole O1 of a rotor punching. In addition, each cooling hole of the other group of cooling holes C2 of one rotor punching of the two rotor punchings is connected to a radial through hole T 12 Connectivity.

[0126] In this way, the coolant is injected into the axial hole T of the motor shaft 110. 11 Afterwards, under the action of the centrifugal force of the motor 100, the coolant flows along the axial hole T of the motor shaft 110. 11 The inner surface of the motor shaft 110 is provided with a portion of the coolant. 12a An axial hole T 11 With a radial through hole T 12 The oil flows into another set of cooling holes C2 of one of the two rotor punchings at the intersection of the two rotor punchings, and flows along another set of cooling oil channels C2' of the rotor core 121 into a groove G of another set of grooves of the other end plate 122b. 23 Then, one groove G in another set of grooves of the other end plate 122b is 23 The coolant in the rotor core 121 flows along a group of cooling oil channels C1' into a groove G in another group of grooves of an end plate 122a. 22 , and along a through hole T of a protrusion P2 on an end surface E1 of an end plate 122a 21 Another part of the coolant is sprayed out in another axial hole T of the motor shaft 110. 11 With another set of radial through holes T 12b A radial through hole T 12The oil flows into a group of cooling holes C1 of one of the other two rotor punchings at the intersection of the two rotor punchings, and flows along another group of cooling oil channels C2' of the rotor core 121 into a groove G in another group of grooves of an end plate 122a. 23 Then, one groove G in another set of grooves of one end plate 122a is 23 The coolant in the rotor core 121 flows along a group of cooling oil channels C1' into one groove G in another group of grooves of the other end plate 122a. 22 , and along the through hole T of a protrusion P2 on one end surface E1 of the other end plate 122b 21 Then, the heat dissipation of the motor 100 is achieved.

[0127] In some embodiments, the motor 100 further includes a motor stator, which includes a stator core and a stator winding. The inner wall of the axial hole of the stator core includes a plurality of winding slots extending along the axial direction of the motor, and the stator winding is wound in the plurality of winding slots. In other words, the stator winding protrudes from the winding slots along the axial direction of the motor, and the stator winding is arranged on the side of one end face of the stator core facing away from the other end face of the stator core along the axial direction of the motor. In addition, the motor rotor 120 is used to be embedded in the axial hole O1 of the stator core, and a through hole T is formed on one side face S1 of each protrusion P2 along the axial direction of the motor. 21 Arranged on the side of one end face of the stator core away from the other end face of the stator core. In this way, no matter the motor 100 is at low speed or high speed, each through hole T 21 The sprayed cooling oil can be sprayed onto the stator winding and cool the stator winding, thereby reducing the temperature rise of the stator winding, improving the heat dissipation performance of the motor 100 and the performance of the motor 100 such as motor power, torque density, etc.

[0128] In some embodiments, the through hole T of one side surface S1 of each protrusion P2 along the motor axis is 21 The distance from one end surface of the stator core is set based on the distance between one end of the stator winding and one end surface of the stator core, wherein the one end of the stator winding is the end of the stator winding away from the one end surface of the stator core.

[0129] For example, if the distance between one end of the stator winding and one end surface of the stator core is L, the through hole T of one side surface S1 of each protrusion P2 along the motor axis is 21 The distance from one end face of the stator core is in the range In this way, no matter the motor 100 is in low speed or high speed, each through hole T 21 The sprayed cooling oil can be sprayed to the part of the stator winding near the middle area of ​​the protruding winding slot, which can effectively control the temperature rise of the stator winding, improve the cooling effect of the stator winding, and improve the heat dissipation performance of the motor 100 and the performance of the motor 100 such as motor power, torque density, etc.

[0130] For example, the types of cooling oil involved in the embodiments of the present application include but are not limited to ethylene glycol cooling oil, synthetic oil, mineral oil, etc.

[0131] It should be noted that the motor axial direction involved in the embodiments of the present application can be understood as the axial direction of the motor shaft 110, the axial direction of the rotor core 121, and the axial direction of the stator core. The motor radial direction can be understood as the radial direction of the motor shaft 110, the radial direction of the rotor core 121, and the radial direction of the stator core. The motor circumferential direction can be understood as the circumferential direction of the motor shaft 110, the circumferential direction of the rotor core 121, and the circumferential direction of the stator core.

[0132] The above description is merely a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this application should be included in the scope of protection of this application. Therefore, the scope of protection of this application should be based on the scope of protection of the claims.

Claims

1. A motor with radial oil injection on the rotor end plate, characterized in that: The motor comprises: A motor shaft, wherein the end surface of the motor shaft includes an axial hole, and the outer peripheral surface of the motor shaft includes a plurality of radial through holes, each of the radial through holes is connected to the axial hole; A motor rotor, comprising a plurality of rotor punchings and at least one end plate, wherein the motor shaft passes through the axial hole of each rotor punching and the center hole of each end plate, and the plurality of rotor punchings are arranged in sequence along the motor axis, wherein one end plate is arranged on the side of one rotor punching facing away from another rotor punching, wherein one end plate comprises an end face facing away from one rotor punching, wherein one end face comprises a plurality of protrusions, wherein each protrusion comprises a side face facing away from the motor shaft, and wherein one side face of each protrusion comprises a through hole, wherein the through hole is used to connect to one of the radial through holes.

2. The motor according to claim 1, characterized in that The motor further comprises: A motor stator, the motor stator comprising a stator core and a stator winding, wherein an inner wall of an axial hole of the stator core comprises a plurality of winding slots extending axially through the motor, and the stator winding is wound in the plurality of winding slots; The motor rotor is used to be embedded in the axial hole of the stator core, and the through holes on the one side of each protrusion along the motor axis are arranged on a side of one end face of the stator core away from the other end face of the stator core.

3. The motor according to claim 1 or 2, characterized in that The plurality of protrusions are arranged at intervals along the circumferential direction of the motor, and the interval between two adjacent protrusions along the circumferential direction of the motor is greater than or equal to the size of each protrusion along the circumferential direction of the motor.

4. The motor according to claim 3, characterized in that The inner wall of the shaft hole of the rotor punching sheet includes at least one protrusion, the outer peripheral surface of the motor shaft includes at least one groove, and each of the protrusions on the inner wall of the shaft hole of the rotor punching sheet is used to be embedded in one of the grooves of the motor shaft; The multiple protrusions on one end face of the one end plate include at least one balancing protrusion, the projection area of the at least one balancing protrusion among the multiple protrusions along the axial direction of the motor is different from the projection areas of the other protrusions, and the distance between each of the protrusions on one end face of the one end plate and the center hole of the one end plate along the radial direction of the motor is equal.

5. The motor according to claim 4, characterized in that The projected area of the at least one balancing protrusion on one end surface of the end plate along the motor axis is smaller than the projected area of the other protrusions on one end surface of the end plate, and the angle between the line connecting the at least one balancing protrusion on one end surface of the end plate and the center of the end plate and the line connecting each protrusion on the inner wall of the axial hole of the rotor punching and the center of the rotor punching is less than 90 degrees; or, The projected area of the at least one balancing protrusion on one end face of the end plate along the motor axis is larger than the projected area of the other protrusions on one end face of the end plate, and the angle between the line connecting the at least one balancing protrusion on one end face of the end plate and the center of the end plate and the line connecting each protrusion on the inner wall of the axial hole of the rotor punching and the center of the rotor punching is greater than 90 degrees and less than 180 degrees.

6. The motor according to any one of claims 1 to 5, characterized in that Along the direction in which the one end plate is away from the one rotor punching sheet, the size of each protrusion on an end surface of the one end plate along the circumferential direction of the motor gradually decreases.

7. The motor according to any one of claims 1 or 2, characterized in that The plurality of protrusions are connected along the circumference of the motor to form an annular protrusion, and the outer diameter of the annular protrusion is smaller than or equal to the outer diameter of the one end plate.

8. The electric motor according to any one of claims 1 to 7, characterized in that The distance between the through hole on the one side surface of each protrusion on one end surface of the one end plate and the other end surface of the one end plate is greater than the dimension of the one end plate along the axial direction of the motor; An opening of the through hole on the one side surface of each protrusion on one end surface of the one end plate is along the radial direction of the motor.

9. The electric motor according to any one of claims 1 to 8, characterized in that The one end plate includes another end face facing the one rotor punching sheet, and the other end face includes multiple groups of grooves, and the distances between the multiple groups of grooves and the center hole of the one end plate are not equal. The distance between each group of grooves and the center hole of the one end plate is negatively correlated with the minimum size of each group of grooves along the circumference of the motor.

10. The electric motor according to any one of claims 1 to 9, characterized in that Each groove of a group of grooves on the other end surface of the one end plate is connected to one of the radial through holes, and is not connected to the through hole on the one side surface of each of the protrusions, wherein: The size of each groove of the group of grooves increases along the circumferential direction of the motor in the radial direction of the motor away from the central axis of the one end plate.

11. The electric machine according to any one of claims 1 to 10, characterized in that Each groove of the other group of grooves on the other end surface of the one end plate is connected to the through hole of the one side surface of the one protrusion, and is not connected to the one radial through hole, wherein: The size of each groove of the another group of grooves along the motor radial direction away from the central axis of the one end plate is reduced along the motor circumferential direction.

12. The electric machine according to any one of claims 1 to 11, characterized in that Each groove of the further group of grooves on the other end surface of the one end plate is not connected to the central hole of the one end plate and the through hole on the one side surface of each protrusion, wherein: The size of both ends of each groove of the further group of grooves along the circumferential direction of the motor is larger than the size of the middle portion of each groove of the further group of grooves along the circumferential direction of the motor.

13. The electric machine according to any one of claims 1 to 8, characterized in that The rotor punching comprises two groups of cooling holes, each group of cooling holes comprises a plurality of cooling holes, and the plurality of cooling holes are arranged at intervals along the circumference of the motor, wherein: Each cooling hole in one group of cooling holes is used to connect to a through hole on one side surface of the protrusion, and each cooling hole in another group of cooling holes is used to connect to an axial hole of one rotor punching.

14. A powertrain, characterized in that: The power assembly includes a reducer and a motor according to any one of claims 1 to 13, wherein the motor shaft is drivingly connected to an input shaft of the reducer.

15. An electric vehicle, characterized in that: The electric vehicle includes wheels, a transmission mechanism, and the powertrain according to claim 14, wherein the powertrain drives the wheels through the transmission mechanism.

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