Motor rotor, motor, power assembly and electric vehicle

Abstract

The utility model provides a motor rotor, a motor, a power assembly and an electric vehicle. The motor rotor comprises a rotor core and a plurality of magnets. The rotor core comprises a shaft hole and multiple groups of through holes, and the multiple groups of through holes are distributed around the shaft hole in the circumferential direction of the rotor core. Each group of through holes comprises a plurality of through holes, and the plurality of through holes are symmetrically distributed along the circumferential direction of the rotor iron core. Each through hole is used for containing at least one magnet, one through hole is further used for containing one reinforcing rib, and the two ends of one reinforcing rib are fixedly connected with one hole wall of one through hole respectively. The size of each reinforcing rib in the arrangement direction of each reinforcing rib and each magnet in each through hole is smaller than the size of a gap between each reinforcing rib and each magnet and the size of a gap between each reinforcing rib and the hole wall of each through hole. And a gap between one reinforcing rib and one magnet is filled with a magnetism isolating material. The motor rotor provided by the embodiment of the utility model not only can meet the requirement of a magnetic flux leakage coefficient, but also has enough mechanical strength.

Description

Technical Field

[0001] The present application relates to the technical field of motors, and more particularly, to a motor rotor, a motor, a powertrain, and an electric vehicle. Background Art

[0002] With the development of electric vehicle technology, the requirements for the speed and performance of motors in electric vehicles are continuously increasing. The permanent magnet motor with an internal magnet has a higher power density and field weakening speed increasing ability, so the permanent magnet motor with an internal magnet is widely used in electric vehicles.

[0003] In order to reduce the magnetic flux leakage of the magnets in the permanent magnet motor with an internal magnet, a magnetic isolation bridge is usually provided between two magnets. The smaller the thickness of the magnetic isolation bridge, the smaller the magnetic flux leakage coefficient of the motor rotor, and the better the magnetic isolation effect of the motor rotor. However, the smaller the thickness of the magnetic isolation bridge, the lower the mechanical strength of the motor rotor. In this way, when the motor rotates at a high speed, the centrifugal force generated during the rotation of the motor rotor is relatively large, which exacerbates the damage of the motor rotor, and further reduces the performance of the motor. Summary of the Utility Model

[0004] The present application provides a motor rotor, a motor, a powertrain, and an electric vehicle. The motor rotor can not only meet the requirements of the magnetic flux leakage coefficient but also have sufficient mechanical strength. Furthermore, the performance of the motor, the performance of the powertrain, and the performance of the electric vehicle can all be improved.

[0005] In a first aspect, a motor rotor is provided. The motor rotor includes a rotor core and a plurality of magnets. The rotor core includes a shaft hole and multiple groups of through holes. The multiple groups of through holes are distributed around the shaft hole along the circumferential direction of the rotor core. Each group of through holes includes a plurality of through holes, and the plurality of through holes are symmetrically distributed along the circumferential direction of the rotor core. Each through hole is used to accommodate at least one magnet, and one through hole is also used to accommodate one reinforcing rib. Two ends of one reinforcing rib are respectively fixedly connected to one hole wall of one through hole. Among them, along the arrangement direction of one reinforcing rib and one magnet in one through hole, the size of one reinforcing rib is respectively smaller than the size of the gap between one reinforcing rib and one magnet, and the size of the gap between one reinforcing rib and one hole wall of one through hole. The gap between one reinforcing rib and one magnet is used to fill a magnetic isolation material.

[0006] The motor rotor provided by the embodiment of the present application is provided with a reinforcing rib fixedly connected to the pore wall of the through hole that houses the magnet in the gap between the magnet and the pore wall of the through hole. In this way, the reinforcing rib can strengthen the strength of the pore wall of the through hole, prevent the through hole from breaking due to the large stress of the pore wall of the through hole caused by the centrifugal force when the motor rotor rotates at a high speed, and further improve the mechanical strength of the motor rotor. In addition, the thickness of the reinforcing rib is set to be smaller than the gap between the reinforcing rib and the magnet and the gap between the reinforcing rib and the pore wall of the through hole respectively. In this way, the gap between the reinforcing rib and the magnet is set relatively larger, and the thickness of the magnetic isolation bridge between two through holes symmetrically distributed along the circumferential direction of the rotor core in a group of through holes will be relatively smaller, which can avoid the magnetic leakage coefficient of the magnet in the through hole being too large, resulting in too low utilization rate of the magnet, and improve the magnetic isolation effect of the motor rotor. Furthermore, the motor rotor can meet the requirements of the magnetic leakage coefficient and have sufficient mechanical strength.

[0007] In one implementation, along the arrangement direction of a reinforcing rib and a magnet, one pore wall of a through hole is arranged opposite to the other pore wall, and the distance between one pore wall of a through hole and the shaft hole is smaller than the distance between the other pore wall and the shaft hole. Among them, there is a gap between the other pore wall and a magnet along the arrangement direction of a reinforcing rib and a magnet, and the gap between the other pore wall and a magnet is used to fill the magnetic isolation material.

[0008] The distance between one pore wall of the through hole and the shaft hole is smaller than the distance between the other pore wall of the through hole and the shaft hole, that is, one pore wall of the through hole is closer to the axis of the motor rotor than the other pore wall. When the motor rotor rotates at a high speed, the centrifugal force at one pore wall of the through hole is greater than that at the other pore wall. In this way, for the same through hole, a reinforcing rib is arranged in the gap between the pore wall with a larger centrifugal force and the magnet, which can not only make the motor rotor meet the requirements of the magnetic leakage coefficient and have sufficient mechanical strength, but also simplify the processing technology of the motor rotor and reduce the production cost of the motor rotor.

[0009] In one implementation, one through hole and another through hole belong to the same group of through holes, and one through hole and another through hole are symmetrically distributed along the circumferential direction of the rotor core. Among them, another through hole and one through hole are respectively used to house a reinforcing rib, and a reinforcing rib in another through hole and a reinforcing rib in one through hole are symmetrically distributed along the circumferential direction of the rotor core.

[0010] Reinforcing ribs are respectively arranged in two through holes symmetrically distributed along the circumferential direction of the rotor core in the same group of through holes, and the reinforcing ribs in the two through holes are also symmetrically distributed along the circumferential direction of the rotor core. In this way, not only can the mechanical strength and magnetic isolation effect of the motor rotor be further improved, but also the unbalance amount of the motor rotor can be reduced.

[0011] In one implementation, another through-hole belongs to the same group of through-holes as a through-hole, and the other through-hole is arranged on a side of the through-hole facing away from the shaft hole. A gap exists between a magnet in the other through-hole and a hole wall of the other through-hole, and the gap between the magnet in the other through-hole and the hole wall of the other through-hole is used to fill a magnetic isolation material.

[0012] In the same group of through-holes, one through-hole is closer to the axis of the motor rotor than the other through-hole. When the motor rotor rotates at a high speed, the centrifugal force at one through-hole is greater than that at the other through-hole. In this way, for the same group of through-holes, by arranging a reinforcing rib in the gap between the hole wall and the magnet of the through-hole with a larger centrifugal force, the motor rotor can not only meet the requirements of the magnetic leakage coefficient but also have sufficient mechanical strength, and at the same time, the processing technology of the motor rotor can be simplified and the production cost of the motor rotor can be reduced.

[0013] In one implementation, the projection of a hole wall of a through-hole along the axial direction of the rotor core is a curved segment, and the bending direction of the curved segment faces away from a magnet in the through-hole. The projection of a reinforcing rib along the axial direction of the rotor core is a straight segment.

[0014] A hole wall of a through-hole is a curved surface. By setting the reinforcing rib as a strip shape, the processing technology of the reinforcing rib can be made simple, and thus the production cost of the motor rotor is reduced.

[0015] In one implementation, the size of the gap between a reinforcing rib and a magnet along the arrangement direction of the reinforcing rib and the magnet is greater than or equal to the size of the gap between the reinforcing rib and a hole wall of a through-hole.

[0016] By arranging the reinforcing rib away from the magnet in the through-hole, more magnetic isolation material can be filled in the gap between the reinforcing rib and the magnet, and thus the magnetic isolation effect of the motor rotor is further improved.

[0017] In one implementation, the aspect ratio of a reinforcing rib is less than or equal to 10. In this way, the strengthening effect of the reinforcing rib reaches the best.

[0018] In one implementation, a magnet is arranged between the other two hole walls of a through-hole, the included angle range between the length direction of a reinforcing rib and the arrangement direction of the other two hole walls is 0 degree to 10 degrees, and the arrangement direction of the reinforcing rib and the magnet intersects with the arrangement direction of the other two hole walls.

[0019] The extending direction of a reinforcing rib is preferably arranged to be close to the arrangement direction of the other two hole walls of the through hole. In this way, along the arrangement direction of the other two hole walls, the magnet between the other two hole walls of the through hole can strengthen the strength at the other two hole walls, and one reinforcing rib can strengthen the strength of one hole wall of the through hole. Furthermore, along the arrangement direction of the other two hole walls, the strengthening effect of the through hole can reach the best.

[0020] In one implementation, the size of the gap between a reinforcing rib and a magnet along the arrangement direction of the other two hole walls of a through hole is greater than the size of the gap between a reinforcing rib and one hole wall of a through hole. A through hole is also used to accommodate another reinforcing rib, and both ends of the other reinforcing rib are fixedly connected to one hole wall of a through hole respectively. Among them, the other reinforcing rib is distributed in the gap between a reinforcing rib and a magnet, and the other reinforcing rib is arranged on one side of one end of a reinforcing rib deviating from the other end.

[0021] The other reinforcing rib can strengthen the hole wall of the through hole between the magnet and a reinforcing rib, further improving the mechanical strength and magnetic isolation effect of the motor rotor.

[0022] In one implementation, the included angle range between the other reinforcing rib and a reinforcing rib is 70 degrees to 150 degrees. In this way, the strengthening effects of the two reinforcing ribs reach the best.

[0023] In one implementation, the aspect ratios of the other reinforcing rib are respectively less than or equal to 10. In this way, the strengthening effect of the other reinforcing rib reaches the best.

[0024] In one implementation, the included angle range between the length direction of the other reinforcing rib and the arrangement direction of a reinforcing rib and a magnet is 0 degrees to 10 degrees.

[0025] The extending direction of the other reinforcing rib is preferably arranged to be close to the arrangement direction of the two hole walls of the through hole. In this way, along the arrangement direction of the two hole walls, the strengthening effect of the through hole can reach the best.

[0026] In one implementation, the inner peripheral surface of the shaft hole includes at least one protrusion. Each group of through holes respectively includes one through hole. The gaps between a reinforcing rib and one hole wall of one through hole in one through hole of multiple groups of through holes respectively form multiple isolated through holes. At least one isolated through hole is a balancing through hole, and the projected area of at least one isolated through hole is different from the projected areas of other isolated through holes.

[0027] By modifying the size of the gap between a reinforcing rib and one hole wall of one through hole in at least one group of through holes of the rotor core, the unbalance amount of the motor rotor is reduced. In this way, the through holes for accommodating the magnetic steel of the motor rotor are reused, the weight removal grams and time of the motor rotor are reduced, and the dynamic balance efficiency of the motor rotor is improved.

[0028] In one implementation, the projected area of at least one isolation through-hole along the axial direction of the rotor core is smaller than that of other isolation through-holes, and the included angle between the line connecting at least one isolation through-hole and the axis of the rotor core and the line connecting each protrusion and the axis of the rotor core is less than 90 degrees.

[0029] By adding weight to the side of the rotor core where the protrusions are located, such as reducing the area of the gap between a reinforcing rib and a hole wall in a through-hole on the side of the rotor core where the protrusions are located, the unbalance of the motor rotor is reduced.

[0030] In one implementation, the projected area of at least one isolation through-hole along the axial direction of the rotor core is larger than that of other isolation through-holes, and the included angle between the line connecting at least one isolation through-hole and the axis of the rotor core and the line connecting each protrusion and the axis of the rotor core is greater than 90 degrees and less than 180 degrees.

[0031] By removing weight from the side opposite to the protrusions of the rotor core, such as increasing the area of the gap between a reinforcing rib and a hole wall in a through-hole on the side opposite to the protrusions of the rotor core, the unbalance of the motor rotor is reduced.

[0032] In a second aspect, a motor is provided, which includes a motor shaft and a motor rotor as described in any one of the first aspect and the possible implementations of the first aspect, and the motor shaft passes through the shaft hole.

[0033] Since the motor rotor provided in the first aspect can not only meet the requirements of the leakage magnetic coefficient but also has sufficient mechanical strength, the performance of the motor provided in the second aspect can be improved, and thus the service life of the motor is relatively long.

[0034] In one implementation, the motor further includes an end plate. Along the axial direction of the rotor core, an end plate is arranged adjacent to the rotor core. One end face of the end plate facing the rotor core includes a plurality of grooves, and the plurality of grooves are arranged at intervals along the circumferential direction of the rotor core. The gap between a reinforcing rib and a hole wall in a through-hole is used for circulating coolant, and the gap between a reinforcing rib and a hole wall in a through-hole is used to communicate with a groove of the end plate.

[0035] Using the gap between a reinforcing rib and a hole wall in a through-hole of the rotor core as an oil passage of the rotor core and connecting it with the oil passage of the motor end plate. On the one hand, it is possible to realize the layout of the oil circuit of the motor without machining a separate oil passage on the rotor core. On the other hand, if the magnet is fixed in the through-hole of the rotor core by an injection molding process, the cost of the injection molding material can be saved. In this way, the production cost of the motor rotor is reduced, and further the production cost of the motor is reduced.

[0036] In a third aspect, a powertrain is provided. The powertrain includes a speed reducer and an electric machine as described in any one of the second aspect and the possible implementation manners of the second aspect. The electric machine further includes a motor shaft, and the rotor core is sleeved on the motor shaft. The motor shaft is in transmission connection with the input shaft of the speed reducer.

[0037] Since the performance of the electric machine provided in the second aspect can be improved, the performance of the powertrain provided in the third aspect can be improved.

[0038] In a fourth aspect, an electric vehicle is provided. The electric vehicle includes wheels, a transmission mechanism, and a powertrain as described in the third aspect. The powertrain drives the wheels through the transmission mechanism.

[0039] Since the performance of the powertrain provided in the third aspect can be improved, the performance of the electric vehicle provided in the third aspect can be improved. Description of the Drawings

[0040] Figure 1 It is a schematic structural diagram of an electric vehicle provided in an embodiment of the present application.

[0041] Figure 2 It is a schematic structural diagram of a motor rotor provided in an embodiment of the present application.

[0042] Figure 3 It is a schematic cross-sectional view of a motor rotor provided in an embodiment of the present application.

[0043] Figure 4 It is Figure 3 an enlarged schematic view of part A of the motor rotor shown.

[0044] Figure 5 It is another schematic cross-sectional view of a motor rotor provided in an embodiment of the present application.

[0045] Figure 6 It is Figure 5 an enlarged schematic view of part B of the motor rotor shown.

[0046] Figure 7 and Figure 8 are respectively other two schematic cross-sectional views of a motor rotor provided in an embodiment of the present application. Detailed Embodiments

[0047] Next, the technical solutions in the present application will be described with reference to the drawings.

[0048] In the description of the embodiments of the present application, unless otherwise specified, " / " means "or". For example, A / B may mean A or B. The "and / or" in this document is merely a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B may represent: A exists alone, A and B exist simultaneously, and B exists alone.

[0049] The orientation or positional relationship indicated by terms such as "upper", "lower", "inner", "outer", etc. in the embodiments of the present application is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present application.

[0050] The reference to "some embodiments" and the like in this specification means that in one or more embodiments of the present application, specific features, structures, or characteristics described in connection with the embodiment are included. Thus, the statements "in some embodiments" and the like that appear in different places in this specification do not necessarily refer to the same embodiment, but mean "one or more but not all embodiments", unless otherwise specifically emphasized in another way. The terms "comprising", "including", "having" and their variants all mean "including but not limited to", unless otherwise specifically emphasized in another way.

[0051] The "equal / to be equal to" involved in the present application is not strictly equal / to be equal to, but within the allowable error range. The "parallel" is not strictly parallel, but within the allowable error range. The "perpendicular" is not strictly perpendicular, but within the allowable error range.

[0052] In the embodiments of the present application, the same reference numeral represents the same component or the same part. In the embodiments of the present application, for multiple identical parts, only one of the parts may be marked with a reference numeral in the drawings. The reference numeral is equally applicable to other identical parts or components. In addition, the dimensions and sizes of the parts shown in the drawings are only exemplary.

[0053] An embodiment of the present application provides a motor rotor, which includes a rotor core and a plurality of magnets. The rotor core includes an axial hole and a plurality of groups of through holes, and the plurality of groups of through holes are distributed around the axial hole along the circumference of the rotor core. Each group of through holes includes a plurality of through holes, and the plurality of through holes are symmetrically distributed along the circumference of the rotor core. Each through hole is used to accommodate at least one magnet, and a through hole is also used to accommodate a reinforcing rib, and the two ends of a reinforcing rib are respectively fixedly connected to a hole wall of a through hole. Among them, along the arrangement direction of a reinforcing rib and a magnet in a through hole, the size of a reinforcing rib is respectively smaller than the size of the gap between a reinforcing rib and a magnet, and the size of the gap between a reinforcing rib and a hole wall of a through hole, and the gap between a reinforcing rib and a magnet is used to fill magnetic isolation material.

[0054] The motor rotor provided in the embodiment of the present application is provided with a reinforcing rib fixedly connected to the hole wall of the through hole in the gap between the magnet and the hole wall of the through hole accommodating the magnet. In this way, the reinforcing rib can strengthen the strength of the hole wall of the through hole, and prevent the through hole from being broken due to the stress of the hole wall of the through hole caused by the existence of centrifugal force when the motor rotor rotates at high speed, thereby improving the mechanical strength of the motor rotor. In addition, the thickness of the reinforcing rib is set to be smaller than the gap between the reinforcing rib and the magnet and the gap between the reinforcing rib and the hole wall of the through hole. In this way, the gap between the reinforcing rib and the magnet is set to be relatively large, which can avoid the excessive leakage coefficient of the magnet in the through hole, resulting in too low utilization rate of the magnet, and improve the magnetic isolation effect of the motor rotor. In addition, the motor rotor can meet the requirements of the leakage coefficient and have sufficient mechanical strength.

[0055] The present application also provides an electric vehicle. Figure 1 The electric vehicle provided in the embodiment of the present application is first described in detail.

[0056] Figure 1 This is a schematic structural diagram of an electric vehicle provided in an embodiment of the present application. Figure 1 As shown, the electric vehicle 1 includes one or more powertrains 10, a battery pack 20 and wheels 30. The powertrain 10 is used to receive power from the battery pack 20, convert the electrical energy into mechanical energy and drive the wheels 30 to rotate.

[0057] The powertrain 10 includes a motor and a reducer. The reducer is connected to the motor in a transmission manner. The reducer is used to connect the motor to the wheel 30 in a transmission manner.

[0058] The electric vehicles provided by the embodiments of the present application include pure electric vehicles, hybrid electric vehicles, range extended electric vehicles, plug-in hybrid electric vehicles, or new energy vehicles, etc. Among them, a pure electric vehicle is also called a pure electric vehicle / battery electric vehicle, or simply referred to as a pure EV / battery EV. A hybrid electric vehicle is also called a hybrid electric vehicle, or simply referred to as an HEV. A range extended electric vehicle is also called a range extended electric vehicle, or simply referred to as an REEV. A plug-in hybrid electric vehicle is also called a plug-in hybrid electric vehicle, or simply referred to as a PHEV. A new energy vehicle is also called a new energy vehicle, or simply referred to as an NEV.

[0059] In some embodiments, the powertrain 10 further includes a controller for controlling the start or stop, forward or reverse rotation, speed increase or decrease, increase or decrease of driving torque, increase or decrease of braking torque, etc. of the motor.

[0060] The motor includes a motor shaft and a motor rotor. The motor shaft passes through the shaft hole, and the motor shaft is drivingly connected to the motor rotor. The following will be combined with Figures 2 to 8 to elaborate in detail on the structure of the motor rotor provided by the embodiments of the present application.

[0061] As Figure 2 , Figure 3 and Figure 5 shown, the motor rotor 100 includes a rotor core 110. The rotor core 110 includes a shaft hole O. Along the axial direction of the rotor core 110, the shaft hole O penetrates through the rotor core 110. The motor shaft passes through the shaft hole O and is drivingly connected to the motor rotor.

[0062] The rotor core 110 further includes multiple groups of through holes 111. Along the circumferential direction of the rotor core 110, the multiple groups of through holes 111 are distributed around the shaft hole O. Each group of through holes 111 includes multiple through holes, and the multiple through holes are symmetrically distributed along the circumferential direction of the rotor core 110.

[0063] In one example, as Figure 2 , Figure 3 and Figure 5As shown, each group of through-holes 111 includes four through-holes 111a to 111d. Two of the four through-holes 111a to 111b are symmetrically distributed along the circumferential direction of the rotor core 110, and the other two through-holes 111c to 111d are also symmetrically distributed along the circumferential direction of the rotor core 110. Moreover, the two through-holes 111a to 111b and the other two through-holes 111c to 111d are arranged in two layers along the radial direction of the rotor core 110, and the two through-holes 111a to 111b are arranged between the other two through-holes 111c to 111d and the shaft hole O.

[0064] Exemplarily, the two through-holes 111a to 111b are arranged in a "V" shape along the circumferential direction of the rotor core 110, that is, the interval between the two through-holes 111a to 111b becomes larger along the radial direction of the rotor core 110 away from the axis of the rotor core 110. Similarly, the other two through-holes 111c to 111d are also arranged in a "V" shape along the circumferential direction of the rotor core 110. That is, the interval between the other two through-holes 111c to 111d becomes larger along the radial direction of the rotor core 110 away from the axis of the rotor core 110.

[0065] In another example, each group of through-holes 111 only includes the two through-holes 111a to 111b described above, and the related descriptions of the two through-holes 111a to 111b will not be elaborated here.

[0066] As Figures 3 to 6 shown, each through-hole includes four hole walls T1 to T4. Two of the hole walls T1 to T2 of each through-hole are arranged opposite to each other along the length direction of each through-hole, and the other two hole walls T3 to T4 are arranged opposite to each other along the width direction of each through-hole. The interval between one of the two hole walls T1 to T2 of each through-hole and the shaft hole O of the rotor core 110 is smaller than the interval between the other hole wall T2 and the shaft hole O of the rotor core 110.

[0067] It should be noted that the width direction of each through-hole intersects with the length direction of each through-hole. For example, the width direction of each through-hole is perpendicular to the length of each through-hole.

[0068] The rotor core 110 includes a plurality of rotor punching sheets arranged along the axial direction of the rotor core 110. Each rotor punching sheet includes a shaft hole and multiple groups of magnet through-holes. The multiple groups of magnet through-holes of each rotor punching sheet surround the shaft hole of each rotor punching sheet along the circumferential direction of the rotor punching sheet. The shaft holes of the multiple rotor punching sheets are axially connected to form the shaft hole O of the rotor core 110, and the multiple groups of through-holes 111 of the rotor core 110 are axially connected by the multiple groups of magnet through-holes of the multiple rotor punching sheets. Exemplarily, the material used for the rotor punching sheet is silicon steel.

[0069] As Figure 2 、 Figure 3 and Figure 5As shown, the motor rotor 100 further includes a plurality of magnets 120. Each through hole of each group of through holes 111 of the rotor core 110 is used to accommodate at least one magnet 120, and each magnet 120 is arranged between the other two hole walls T3-T4 of each through hole. As Figures 3 to 5 shown, there is a gap between each of the two hole walls T1-T2 of each through hole along the length direction of each through hole and one magnet 120 respectively.

[0070] As Figures 3 to 6 shown, the projection of each of the two hole walls T1-T2 of each through hole is a curved segment, and the bending direction of the curved segment deviates from one magnet 120 in each through hole. In other words, each of the two hole walls T1-T2 of each through hole is a curved surface, and the curved surface bends away from one magnet 120 in each through hole.

[0071] At least one through hole in at least one group of through holes 111 is also used to accommodate at least one reinforcing rib. Below, taking one through hole 111a in one group of through holes 111 as an example, the structure of the reinforcing rib will be described in detail.

[0072] As Figures 3 to 6 shown, a reinforcing rib 112 is distributed in the gap between one magnet 120 and one hole wall T1 of one through hole 111a, and both ends of one reinforcing rib 112 are fixedly connected to one hole wall T1 of one through hole 111a respectively. In this way, one reinforcing rib 112 can strengthen the strength of one hole wall T1 of one through hole 111a, prevent the stress of one hole wall T1 of one through hole 111a from being too large due to the existence of centrifugal force when the motor rotor 100 rotates at high speed, resulting in the fracture of one through hole 111a, and thus improve the mechanical strength of the motor rotor 100.

[0073] In addition, as Figures 3 to 6 shown, along the arrangement direction of one reinforcing rib 112 and one magnet 120 in one through hole 111a, the size of one reinforcing rib 112 is respectively smaller than the size of the gap J1 between one reinforcing rib 112 and one magnet 120 and the size of the gap J2 between one reinforcing rib 112 and one hole wall T1 of one through hole 111a. In this way, the gap J1 between one reinforcing rib 112 and the magnet 120 is set relatively larger, and the thickness of the magnetic isolation bridge between two through holes symmetrically distributed along the circumferential direction of the rotor core 110 in one group of through holes 111 will be relatively smaller, which can avoid the leakage magnetic coefficient of the magnet 120 in one through hole 111a from being too large, resulting in too low utilization rate of the magnet 120, and improve the magnetic isolation effect of the motor rotor 100. Furthermore, the motor rotor 100 can not only meet the requirements of the leakage magnetic coefficient but also have sufficient mechanical strength.

[0074] In some embodiments, the projection of a reinforcing rib 112 along the axial direction of the rotor core 110 is a straight line segment. That is, by setting a reinforcing rib 112 to be strip-shaped, the processing technology of a reinforcing rib 112 can be simplified, thereby reducing the production cost of the motor rotor 100.

[0075] In some embodiments, along the width direction of a through hole 111a, the dimension of a hole wall T1 of a through hole 111a is greater than the other two hole walls T 2～ the interval between T4. The length of a reinforcing rib 112 is greater than or equal to the interval between the other two hole walls T 2～ of T4 and less than or equal to the dimension of a hole wall T1 of a through hole 111a along the width direction of a through hole 111a.

[0076] The gap J1 between a reinforcing rib 112 and a magnet 120 is used to fill a magnetic isolation material. For example, the magnetic isolation material is air or a non-magnetic conductive glue. In this way, since the magnetic lines of force do not flow in the gap J1 between a reinforcing rib 112 and a magnet 120, the magnetic leakage and magnetic flux loss of the magnet 120 in a through hole 111a can be reduced, and the magnetic focusing ability of the magnet 120 can be improved.

[0077] In some embodiments, along the arrangement direction of a reinforcing rib 112 and a magnet 120, the dimension of the gap J1 between a reinforcing rib 112 and a magnet 120 is greater than or equal to the dimension of the gap J2 between a reinforcing rib 112 and a hole wall T1 of a through hole 111a. That is to say, a reinforcing rib 112 is arranged away from the magnet 120 in a through hole 111a. In this way, more magnetic isolation material can be filled in the gap J1 between a reinforcing rib 112 and a magnet 120, thereby further improving the magnetic isolation effect of the motor rotor 100.

[0078] In some embodiments, the included angle range between the length direction of a reinforcing rib 112 and the arrangement direction of the other two hole walls T3-T4 of a through hole 111a is 0 degree to 10 degrees.

[0079] The extending direction of a reinforcing rib 112 is set as close as possible to the arrangement direction of the other two hole walls T3-T4. In this way, along the arrangement direction of the other two hole walls T3-T4, the magnets between the other two hole walls T3-T4 can strengthen the strength at the other two hole walls T3-T4, and a reinforcing rib 112 can strengthen the strength of a hole wall T1 of a through hole 111a. Furthermore, along the arrangement direction of the other two hole walls T3-T4, the strengthening effect of a through hole 111a can reach the best.

[0080] In some embodiments, the aspect ratio of a reinforcing rib 112 is less than or equal to 10. In this way, the strengthening effect of a reinforcing rib 112 reaches the best.

[0081] It should be noted that the width direction of a reinforcing rib 112 can be understood as the arrangement direction of a reinforcing rib 112 and a magnet 120.

[0082] In some embodiments, a reinforcing rib 112 and a through hole 111a are of an integral structure, that is to say, a reinforcing rib 112 and a through hole 111a are realized by an integral molding process. In this way, the production cost of the rotor core 110 can be reduced. In the embodiments of the present application, the materials of a reinforcing rib 112 and the rotor core 110 are the same. For example, the materials of a reinforcing rib 112 and the rotor core 110 are both silicon steel.

[0083] In some embodiments, along the arrangement direction of the other two hole walls T3-T4 of a through hole 111a, the size of the gap J1 between a reinforcing rib 112 and a magnet 120 is greater than the size of the gap J2 between a reinforcing rib 112 and a hole wall T1 of a through hole 111a. As Figure 5 and Figure 6 shown, a through hole 111a is also used to accommodate another reinforcing rib 113. The two ends of the other reinforcing rib 113 are respectively fixedly connected to a hole wall T1 of a through hole 111a. The other reinforcing rib 113 is distributed in the gap J1 between a reinforcing rib 112 and a magnet 120, and the other reinforcing rib 113 is arranged on one side of one end of a reinforcing rib 112 away from the other end. In this way, the other reinforcing rib 113 can strengthen the hole wall of a through hole 111a between the magnet 120 and a reinforcing rib 112, and further improve the mechanical strength and magnetic isolation effect of the motor rotor 100.

[0084] In some embodiments, as Figure 5 and Figure 6 shown, along the arrangement direction of the other two hole walls T3-T4 of a through hole 111a, the sizes of the other reinforcing rib 113 are respectively smaller than the size of the gap J3 between the other reinforcing rib 113 and a hole wall T1 of a through hole 111a and the size of the gap J1 between a reinforcing rib 112 and a magnet 120 of a through hole 111a. In this way, the relatively larger gap J3 between the other reinforcing rib 113 and a hole wall T1 of a through hole 111a can avoid the leakage magnetic coefficient of the magnet 120 in a through hole 111a being too large, resulting in too low utilization rate of the magnet 120, and improve the magnetic isolation effect of the motor rotor 100. Furthermore, the motor rotor 100 can not only meet the requirements of the leakage magnetic coefficient, but also have sufficient mechanical strength.

[0085] In some embodiments, the projection of another reinforcing rib 113 along the axial direction of the rotor core 110 is a straight line segment. That is, by setting another reinforcing rib 113 as a strip shape, the processing technology of another reinforcing rib 113 can be simplified, thereby reducing the production cost of the motor rotor 100.

[0086] In some embodiments, such as Figure 5 and Figure 6 shown, one end of another reinforcing rib 113 is connected to one end of a reinforcing rib 112. In this way, another reinforcing rib 113 and a reinforcing rib 112 can form two intersecting reinforcing ribs, further enhancing the overall strength of the hole wall of a through hole 111a.

[0087] In some embodiments, the included angle range between another reinforcing rib 113 and a reinforcing rib 112 is 70 degrees to 150 degrees. In this way, the strengthening effect of the two reinforcing ribs reaches the best.

[0088] In some embodiments, the included angle range between the length direction of another reinforcing rib 113 and the arrangement direction of a reinforcing rib 112 and a magnet 120 is 0 degrees to 10 degrees. The extending direction of another reinforcing rib 113 is set as close as possible to the arrangement direction of the two hole walls T1 - T2 of a through hole 111a. In this way, along the arrangement direction of the two hole walls T1 - T2 of a through hole 111a, the strengthening effect of a through hole 111a can reach the best.

[0089] In some embodiments, the aspect ratio of another reinforcing rib 113 is less than or equal to 10 respectively. In this way, the strengthening effect of another reinforcing rib 113 reaches the best.

[0090] In some embodiments, another reinforcing rib 113 and a through hole 111a are of an integral structure. That is to say, another reinforcing rib 113 and a through hole 111a are realized by an integral molding process. In this way, the production cost of the rotor core 110 can be reduced. In the embodiments of the present application, the materials of another reinforcing rib 113 and the rotor core 110 are the same. For example, the materials of both another reinforcing rib 113 and the rotor core 110 are silicon steel.

[0091] In some embodiments, such as Figures 2 to 6 shown, no reinforcing rib is provided in the gap H between another hole wall T2 of a through hole 111a and a magnet 120. In this way, the gap H between another hole wall T2 of a through hole 111a and a magnet 120 is used to fill a magnetic isolation material.

[0092] Since a hole wall T1 of a through hole 111a is closer to the axis of the motor rotor 100 than another hole wall T2, when the motor rotor 100 rotates at a high speed, the centrifugal force at a hole wall T1 of a through hole 111a is greater than the centrifugal force at another hole wall T2. Thus, for a through hole 111a, only one reinforcing rib 112 is provided in the gap between the hole wall T1 with a larger centrifugal force and the magnet 120. This can not only enable the motor rotor 100 to meet the requirements of the magnetic leakage coefficient but also have sufficient mechanical strength, and can also simplify the processing technology of the motor rotor 100 and reduce the production cost of the motor rotor 100.

[0093] In some embodiments, as Figures 2 to 6 shown, at least one of a reinforcing rib 112 and another reinforcing rib 113 is provided in the gap between a hole wall T1 of a through hole 111a of each group of through holes 111 and a magnet 120. In some embodiments, no reinforcing rib is provided in the gap H between another hole wall T2 of a through hole 111a of each group of through holes 111 and a magnet 120. Thus, not only can the mechanical strength and magnetic isolation effect of the motor rotor 100 be further improved, but also the unbalance amount of the motor rotor 100 can be reduced.

[0094] In some embodiments, as Figures 2 to 6 shown, at least one of a reinforcing rib 112 and another reinforcing rib 113 is also provided in the gap between a hole wall T1 of another through hole 111b of a group of through holes 111 and a magnet 120. A reinforcing rib 112 in another through hole 111b and a reinforcing rib 112 in a through hole 111a are symmetrically distributed along the circumferential direction of the rotor core 110, and another reinforcing rib 113 in another through hole 111b and another reinforcing rib 113 in a through hole 111a are symmetrically distributed along the circumferential direction of the rotor core 110.

[0095] At least one of a reinforcing rib 112 and another reinforcing rib 113 is respectively provided in two through holes 111a - 111b that are symmetrically distributed along the circumferential direction of the rotor core 110 in the same group of through holes 111, and the reinforcing ribs in the two through holes 111a - 111b are also symmetrically distributed along the circumferential direction of the rotor core 110. Thus, not only can the mechanical strength and magnetic isolation effect of the motor rotor 100 be further improved, but also the unbalance amount of the motor rotor 100 can be reduced.

[0096] In some embodiments, as Figures 2 to 6 shown, no reinforcing rib is provided in the gap H between another hole wall T2 of another through hole 111b of a group of through holes 111 and a magnet 120. Thus, the gap H between another hole wall T2 of another through hole 111b and a magnet 120 is used to fill a magnetic isolation material.

[0097] Thus, for another through-hole 111b, only one reinforcing rib 112 is disposed in the gap between one hole wall T1 with a relatively large centrifugal force and the magnet 120. This can not only enable the motor rotor 100 to meet the requirements of the magnetic leakage coefficient and have sufficient mechanical strength, but also simplify the processing technology of the motor rotor 100 and reduce the production cost of the motor rotor 100.

[0098] In some embodiments, as Figures 2 to 6 shown, at least one of a reinforcing rib 112 and another reinforcing rib 113 is disposed in the gap between one hole wall T1 of another through-hole 111b of each group of through-holes 111 and one magnet 120. In some embodiments, no reinforcing rib 112 is disposed in the gap H between another hole wall T2 of another through-hole 111ba of each group of through-holes 111 and one magnet 120. Thus, not only can the mechanical strength and magnetic isolation effect of the motor rotor 100 be further improved, but also the unbalance amount of the motor rotor 100 can be reduced.

[0099] In some embodiments, as Figures 2 to 6 shown, no reinforcing rib is disposed in the gap between one hole wall T1 of any one of the other two through-holes 111c - 111d of each group of through-holes 111 and one magnet 120. Thus, the gap between one hole wall T1 of any one of the other two through-holes 111c - 111d of each group of through-holes 111 and one magnet 120 in any one through-hole is used to fill a magnetic isolation material.

[0100] In some embodiments, as Figures 2 to 6 shown, no reinforcing rib is also disposed in the gap between another hole wall T2 of any one of the other two through-holes 111c - 111d of each group of through-holes 111 and one magnet 120. Thus, the gap between another hole wall T2 of any one of the other two through-holes 111c - 111d of each group of through-holes 111 and one magnet 120 in any one through-hole is used to fill a magnetic isolation material.

[0101] In some embodiments, the gap J2 between one reinforcing rib 112 and one hole wall T1 of a through-hole 111a is also used to fill a magnetic isolation material. The gap J3 between another reinforcing rib 112 and one hole wall T1 of a through-hole 111a is also used to fill a magnetic isolation material. Thus, the magnetic isolation effect of the motor rotor 100 can be further improved.

[0102] In some embodiments, the gap J2 between a rib 112 and a hole wall T1 of a through hole 111a can be used as a weight-reducing through hole of the rotor core 110. The gap J3 between another rib 112 and a hole wall T1 of a through hole 111a can also be used as a weight-reducing through hole of the rotor core 110. In this way, the rotor core 110 does not need to be machined with a separate weight-reducing through hole, reducing the production cost of the motor rotor 100.

[0103] In some embodiments, the gap J2 between a rib 112 and a hole wall T1 of a through hole 111a serves as an oil passage through hole of the rotor core 110, that is, the gap J2 between a rib 112 and a hole wall T1 of a through hole 111a is used for circulating a coolant. The gap J3 between another rib 112 and a hole wall T1 of a through hole 111a can also serve as an oil passage through hole of the rotor core 110, that is, the gap J3 between another rib 112 and a hole wall T1 of a through hole 111a is used for circulating a coolant. In this way, on the one hand, the rotor core 110 does not need to be machined with a separate oil passage, and the layout of the oil passage of the rotor core 110 can be realized. On the other hand, if the magnet 120 is fixed in the through hole of the rotor core 110 by an injection molding process, the cost of the injection molding material can be saved.

[0104] In addition, in some embodiments, the motor further includes at least one end plate, and each end plate is arranged adjacent to the rotor core 110 along the axial direction of the rotor core 110. The end face of an end plate facing the rotor core 110 includes a plurality of grooves, and the plurality of grooves are arranged at intervals along the circumferential direction of the rotor core 110. The gap J2 between a rib 112 in a through hole 111a and a hole wall T1 of a through hole 111a is used to communicate with a groove of an end plate. In this way, the coolant in the gap J2 between a rib 112 in a through hole 111a and a hole wall T1 of a through hole 111a can flow into the groove of an end plate. The gap J3 between another rib 113 in a through hole 111a and a hole wall T1 of a through hole 111a is also used to communicate with a groove of the end plate. In this way, the coolant in the gap J3 between another rib 113 in a through hole 111a and a hole wall T1 of a through hole 111a can flow into the groove of an end plate. Furthermore, the layout of the oil passage of the motor rotor 100 is realized.

[0105] Such as Figure 7 and Figure 8As shown, the inner circumferential surface of the shaft hole O of the rotor core 110 includes at least one protrusion P, and each protrusion P protrudes from the inner circumferential surface of the rotor core 110 towards the axis of the rotor core 110. The outer circumferential surface of the motor shaft includes at least one keyway, and the keyway recesses from the outer circumferential surface of the motor shaft towards the inside of the motor shaft. Each keyway is used to accommodate one protrusion P on the inner circumferential surface of the rotor core 110, and the keyway and each protrusion P are in transitional fit or interference fit along the circumferential direction of the rotor core 110. After the motor shaft and the rotor core 110 are assembled, due to the gap between the keyway and each protrusion P, the center of gravity of the rotor core 110 deviates from the rotation axis of the motor shaft, resulting in the imbalance of the motor rotor 100. In order to reduce the imbalance of the motor rotor 100, the rotor core 110 is also provided with balancing through holes. For example, the gap J2 between a rib 112 and a hole wall T1 of a through hole 111a in one of the multiple through holes 111 is used as the balancing through hole of the rotor core 110. For another example, the gap J3 between another rib 112 and a hole wall T1 of a through hole 111a is also used as the balancing through hole of the rotor core 110. In this way, on the one hand, the through holes for accommodating magnets in the motor rotor 100 are reused, and there is no need to process separate balancing through holes, reducing the production cost of the motor rotor 100. On the other hand, the weight removal grams and time of the motor rotor 100 are reduced, and the dynamic balance efficiency of the motor rotor 100 is improved.

[0106] As Figure 7 and Figure 8 shown, the gaps J2 between a rib 112 and a hole wall T1 of a through hole 111a in one of the multiple through holes 111 respectively form multiple isolation through holes J2, at least one isolation through hole J2 is a balancing through hole G, and the projected area of at least one isolation through hole J2 is different from the projected areas of other isolation through holes J2. By modifying the size of the gap between a rib 112 and a hole wall T1 of a through hole 111a in at least one group of through holes of the rotor core 110, the imbalance amount of the motor rotor 100 is reduced.

[0107] Exemplarily, as Figure 7 shown, along the axial direction of the rotor core 110, the projected area of at least one isolation through hole J2 is smaller than the projected areas of other isolation through holes J2, and the included angle between the connection line of at least one isolation through hole J2 and the axis of the rotor core 110 and the connection line of each protrusion P and the axis of the rotor core 110 is less than 90 degrees. By adding weight to the side where the protrusion P of the rotor core 110 is located, such as reducing the size of the gap J2 between a rib 112 and a hole wall T1 of a through hole 111a on the side where the protrusion P of the rotor core 110 is located, the imbalance amount of the motor rotor 100 is reduced.

[0108] Exemplarily, as Figure 8As shown, the projected area of at least one isolation through-hole J2 along the axial direction of the rotor core 110 is larger than that of other isolation through-holes J2, and the included angle between the line connecting at least one isolation through-hole G1 and the axis of the rotor core 110 and the line connecting each protrusion P and the axis of the rotor core 110 is greater than 90 degrees and less than 180 degrees. By removing weight on the side opposite to the protrusion P of the rotor core 110, such as increasing the size of the gap J2 between a reinforcing rib 112 and a hole wall T1 of a through-hole 111a in the through-hole 111a on the side opposite to the protrusion P of the rotor core 110, the unbalance amount of the motor rotor 100 is reduced.

[0109] It should be noted that the axial direction of the rotor core 110 can also be understood as the axial direction of the rotor punching sheet, the height direction of the magnet, or the height direction of the through-hole. The radial direction of the rotor core 110 can be understood as the radial direction of the rotor punching sheet. The circumferential direction of the rotor core 110 can be understood as the circumferential direction of the rotor punching sheet or the circumferential direction of the motor shaft. In addition, the length direction of the through-hole can be understood as the length direction of the magnet, and the width direction of the through-hole can be understood as the width direction of the magnet 120.

[0110] As described above, the above is only the specific implementation manner of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present application can easily think of changes or substitutions, which should all be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claimed rights.

Claims

1. A motor rotor, characterized in that, The motor rotor includes a rotor core and a plurality of magnets. The rotor core includes a shaft hole and multiple groups of through holes. Along the circumferential direction of the rotor core, the multiple groups of through holes are distributed around the shaft hole. Each group of through holes includes a plurality of through holes, and the plurality of through holes are symmetrically distributed along the circumferential direction of the rotor core. Each through hole is used to accommodate at least one of the magnets, and one through hole is also used to accommodate a reinforcing rib. Two ends of the one reinforcing rib are respectively fixedly connected to a hole wall of the one through hole. Wherein: Along the arrangement direction of the one reinforcing rib and the one magnet in the one through hole, the size of the one reinforcing rib is respectively smaller than the size of the gap between the one reinforcing rib and the one magnet, and the size of the gap between the one reinforcing rib and a hole wall of the one through hole. The gap between the one reinforcing rib and the one magnet is used to fill a magnetic isolation material.

2. The motor rotor according to claim 1, wherein, Along the arrangement direction of the one reinforcing rib and the one magnet, a hole wall of the one through hole is arranged opposite to another hole wall. The distance between the one hole wall of the one through hole and the shaft hole is smaller than the distance between the another hole wall and the shaft hole. Wherein: Along the arrangement direction of the one reinforcing rib and the one magnet, there is a gap between the another hole wall and the one magnet. The gap between the another hole wall and the one magnet is used to fill the magnetic isolation material.

3. The motor rotor according to claim 1 or 2, characterized in that, The one through hole and another through hole belong to the same group of through holes, and the one through hole and the another through hole are symmetrically distributed along the circumferential direction of the rotor core. Wherein: The another through hole and the one through hole are respectively used to accommodate the one reinforcing rib, and the reinforcing rib in the another through hole and the reinforcing rib in the one through hole are symmetrically distributed along the circumferential direction of the rotor core.

4. The motor rotor according to claim 1 or 2, characterized in that, Another through hole and the one through hole belong to the same group of through holes, and the another through hole is arranged on a side of the one through hole away from the shaft hole. Wherein: There is a gap between the one magnet in the another through hole and a hole wall of the another through hole. The gap between the one magnet in the another through hole and the hole wall of the another through hole is used to fill the magnetic isolation material.

5. The motor rotor according to claim 1 or 2, characterized in that, The projection of a hole wall of the one through hole along the axial direction of the rotor core is a curved segment, and the bending direction of the curved segment is away from the one magnet in the one through hole; The projection of the one reinforcing rib along the axial direction of the rotor core is a straight segment.

6. The motor rotor according to claim 1 or 2, characterized in that, Along the arrangement direction of the one reinforcing rib and the one magnet, the size of the gap between the one reinforcing rib and the one magnet is greater than or equal to the size of the gap between the one reinforcing rib and a hole wall of the one through hole; The aspect ratio of the one reinforcing rib is less than or equal to 10; The one magnet is arranged between the other two hole walls of the one through hole, and the included angle range between the length direction of the one reinforcing rib and the arrangement direction of the other two hole walls is 0 degree to 10 degrees, and the arrangement direction of the one reinforcing rib and the one magnet intersects with the arrangement direction of the other two hole walls.

7. The motor rotor according to claim 1 or 2, characterized in that The size of the gap between the one reinforcing rib and the one magnet in the arrangement direction along the other two hole walls of the one through hole is greater than the size of the gap between the one reinforcing rib and one hole wall of the one through hole. The one through hole is also used to accommodate another reinforcing rib, and both ends of the other reinforcing rib are fixedly connected to one hole wall of the one through hole, wherein: The other reinforcing rib is distributed in the gap between the one reinforcing rib and the one magnet, and the other reinforcing rib is arranged on one side where one end of the one reinforcing rib faces away from the other end.

8. The motor rotor according to claim 7, characterized in that, The included angle range between the other reinforcing rib and the one reinforcing rib is 70 degrees to 150 degrees; The aspect ratios of the length and width of the other reinforcing rib are respectively less than or equal to 10; The included angle range between the length direction of the other reinforcing rib and the arrangement direction of the one reinforcing rib and the one magnet is 0 degrees to 10 degrees.

9. The motor rotor according to claim 1 or 2, characterized in that, The inner peripheral surface of the shaft hole includes at least one protrusion. Each group of the through holes respectively includes the one through hole. The gaps between the one reinforcing rib in the one through hole of multiple groups of the through holes and one hole wall of the one through hole respectively form multiple isolation through holes. At least one of the isolation through holes is a balancing through hole, and the projected area of the at least one isolation through hole is different from the projected areas of the other isolation through holes.

10. The motor rotor according to claim 9, characterized in that, Along the axial direction of the rotor core, the projected area of the at least one isolation through hole is smaller than the projected areas of the other isolation through holes, and the included angle between the connection line of the at least one isolation through hole and the rotor core axis and the connection line of each protrusion and the rotor core axis is less than 90 degrees.

11. The motor rotor according to claim 9, characterized in that, Along the axial direction of the rotor core, the projected area of the at least one isolation through hole is larger than the projected areas of the other isolation through holes, and the included angle between the connection line of the at least one isolation through hole and the rotor core axis and the connection line of each protrusion and the rotor core axis is greater than 90 degrees and less than 180 degrees.

12. A motor, characterized in that, The motor includes a motor shaft and a motor rotor as described in any one of claims 1 to 11, and the motor shaft passes through the shaft hole.

13. The motor according to claim 12, characterized in that, The motor further includes an end plate. Along the axial direction of the rotor core, the end plate is arranged adjacent to the rotor core. One end face of the end plate facing the rotor core includes a plurality of grooves, and the plurality of grooves are arranged at intervals along the circumferential direction of the rotor core; The gap between the one reinforcing rib in the one through hole and one hole wall of the one through hole is used for circulating coolant, and the gap between the one reinforcing rib in the one through hole and one hole wall of the one through hole is used to communicate with one of the grooves of the end plate.

14. A powertrain, characterized in that, The powertrain includes a reducer and a motor as described in claim 13. The motor further includes a motor shaft, the rotor core is sleeved on the motor shaft, and the motor shaft is in transmission connection with the input shaft of the reducer.

15. An electric vehicle, characterized in that, The electric vehicle includes wheels, a transmission mechanism, and a powertrain as described in claim 14, and the powertrain drives the wheels through the transmission mechanism.

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