Rotor punching sheet, driving motor, power assembly and vehicle

Abstract

The invention provides a rotor punching sheet, a driving motor, a power assembly and a vehicle. The rotor punching sheet comprises a central hole, a plurality of groups of magnetic steel holes and a plurality of magnetic isolation holes. Each group of magnetic steel holes comprises a pair of first magnetic steel holes and a pair of second magnetic steel holes. A pair of first magnetic steel holes in each group of magnetic steel holes form a first V-shaped structure, a pair of second magnetic steel holes in each group of magnetic steel holes form a second V-shaped structure, and the second V-shaped structures are arranged between the first V-shaped structures and the outer peripheral surface of the rotor punching sheet. The opening direction of each first V-shaped structure and the opening direction of each second V-shaped structure deviate from one center hole. Every two adjacent first magnetic steel holes between every two adjacent groups of magnetic steel holes form a third V-shaped structure, and each magnetic isolation hole is used for isolating one third V-shaped structure from the peripheral surface of the rotor. The rotor punching sheet provided by the invention is provided with the magnetic isolation holes matched with the magnetic steel holes based on variable magnetic leakage characteristics, so that a motor rotor formed by the rotor punching sheet can adjust a magnetic field in response to q-axis current of a motor stator, the speed regulation range is large, and extra demagnetization current is not needed.

Description

Technical Field

[0001] The present application relates to the field of vehicle technology, and in particular to a rotor punching sheet, a drive motor, a power assembly and a vehicle. Background Art

[0002] Permanent Magnet Synchronous Machine (PMSM) has the advantages of high torque density, low loss, high efficiency, simple structure and reliable operation. Most existing permanent magnet synchronous motors use demagnetization armature reaction to adjust the magnetic field through the motor stator d-axis current to increase the speed regulation range. However, this method requires additional demagnetization current, which will cause irreversible demagnetization of the permanent magnet. Summary of the invention

[0003] The present application provides a rotor punching, a drive motor, a powertrain and a vehicle. Based on the variable leakage magnetic characteristics, a magnetic isolation hole structure that matches the magnetic steel hole is set in the rotor punching, so that the motor rotor formed by the rotor punching can adjust the magnetic field in response to the q-axis current of the motor stator, with a large speed regulation range and without the need for additional demagnetization current.

[0004] In a first aspect, the present application provides a rotor punching, which includes a center hole, multiple groups of magnetic steel holes and multiple magnetic isolation holes. The multiple groups of magnetic steel holes and the multiple magnetic isolation holes are respectively arranged around the center hole along the circumference of the rotor punching, and each group of magnetic steel holes includes a pair of first magnetic steel holes and a pair of second magnetic steel holes. A center hole, each first magnetic steel hole, each second magnetic steel hole and each magnetic isolation hole respectively penetrate the rotor punching along the axial direction of the rotor punching.

[0005] In the radial direction of the rotor punching, a pair of first magnetic steel holes in each group of magnetic steel holes are symmetrically arranged to form a first V-shaped structure, and a pair of second magnetic steel holes are symmetrically arranged to form a second V-shaped structure. Each second V-shaped structure is arranged between a first V-shaped structure and the outer peripheral surface of the rotor punching. The openings of each first V-shaped structure and each second V-shaped structure face away from a central hole, and a first magnetic steel hole in each group of magnetic steel holes is symmetrically arranged with another first magnetic steel hole in another adjacent group of magnetic steel holes to form a third V-shaped structure, and the opening of each third V-shaped structure faces a central hole.

[0006] Each magnetic isolation hole is used to isolate a third V-shaped structure from the outer peripheral surface of the rotor punching. Each magnetic isolation hole includes a first section, a second section and a third section. A first section in each magnetic isolation hole is connected to a third section through a second section. A first section and a third section in each magnetic isolation hole are symmetrically arranged along the radial direction of the rotor punching to form a fourth V-shaped structure. The opening of each fourth V-shaped structure faces a center hole along the radial direction of the rotor punching, and each fourth V-shaped structure is arranged between a third V-shaped structure and the outer peripheral surface of the rotor punching along the radial direction of the rotor punching.

[0007] The rotor punching provided in the present application includes a plurality of groups of spaced-apart magnetic steel holes along the circumferential direction. A pair of first magnetic steel holes and a pair of second magnetic steel holes in each group of magnetic steel holes are arranged to form two V-shaped structures. The two V-shaped structures are both oriented away from a central hole. The two adjacent first magnetic steel holes in two adjacent groups of magnetic steel holes also form a third V-shaped structure, and each magnetic isolation hole is used to isolate a third V-shaped structure from the outer peripheral surface of the rotor punching. Among them, the first section and the third section of each magnetic isolation hole form a fourth V-shaped structure, and are arranged between the third V-shaped structure and the outer peripheral surface of the rotor punching, which can ensure the isolation effect of the magnetic isolation hole on the third V-shaped structure.

[0008] The rotor punching provided in the present application is a unit that constitutes the rotor core in the motor rotor. Each magnetic steel hole of the rotor punching can be used to accommodate permanent magnets, and the arrangement of the two V-shaped structures can increase the magnetic resistance torque and improve the torque output capacity of the drive motor. Each magnetic isolation hole is used to suppress the magnetic leakage phenomenon of the permanent magnets in the two first magnetic steel holes in a third V-shaped structure, and promote the magnetic leakage phenomenon of the permanent magnets in the two adjacent second magnetic steel holes in two adjacent groups of magnetic steel holes.

[0009] When the q-axis current of the motor stator is large, the magnetic flux of the permanent magnets in the first magnetic steel hole and the second magnetic steel hole is superimposed and returns after passing through the motor stator to form a closed loop; when the q-axis current of the motor stator is small, the permanent magnets in the two first magnetic steel holes in the third V-shaped structure form a series closed loop through the leakage magnetic circuit, and the permanent magnets in the second magnetic steel hole form a parallel closed loop through the leakage magnetic circuit. Therefore, by adjusting the q-axis current of the motor stator, the leakage magnetic flux of the permanent magnets in the two adjacent second magnetic steel holes can be controlled, which broadens the speed regulation range of the motor rotor and does not require additional demagnetization current.

[0010] In one implementation, the angle of each first V-shaped structure and the angle of each second V-shaped structure are away from a center hole in the radial direction of the rotor punching, the angle of each first V-shaped structure is greater than the angle of each second V-shaped structure, the angle of each third V-shaped structure and the angle of each fourth V-shaped structure are toward a center hole in the radial direction of the rotor punching, the angle of each third V-shaped structure is smaller than the angle of each fourth V-shaped structure, the angle of each third V-shaped structure is smaller than the angle of each first V-shaped structure, and the angle of each second V-shaped structure is smaller than the angle of each fourth V-shaped structure.

[0011] In this implementation, the included angle of the first V-shaped structure in each group of magnetic steel holes is greater than the included angle of the second V-shaped structure, the included angle of the third V-shaped structure in two adjacent groups of magnetic steel holes is less than the included angle of the first V-shaped structure, and the included angle of the fourth V-shaped structure is less than the included angle of the second V-shaped structure, all of which are used to guide the magnetic lines of force to extend toward the outer peripheral surface of the rotor punching along a preset direction. The included angle of the third V-shaped structure in two adjacent groups of magnetic steel holes is less than the included angle of the fourth V-shaped structure of the magnetic isolation hole, which is used to ensure the isolation effect of the magnetic isolation hole on the third V-shaped structure.

[0012] In one implementation, a first magnetic steel hole and a second magnetic steel hole in each group of magnetic steel holes are arranged to form a fifth V-shaped structure, another first magnetic steel hole and another second magnetic steel hole in each group of magnetic steel holes are arranged to form a sixth V-shaped structure, and a fifth V-shaped structure and a sixth V-shaped structure in each group of magnetic steel holes are symmetrically arranged along the radial direction of the rotor punching.

[0013] A first section of each magnetic isolation hole extends into an opening of a fifth V-shaped structure in a group of magnetic steel holes, and a third section of each magnetic isolation hole extends into an opening of a sixth V-shaped structure in another group of magnetic steel holes. One group of magnetic steel holes is adjacent to another group of magnetic steel holes along the circumferential direction of the rotor punching.

[0014] In this implementation, a fifth V-shaped structure and a sixth V-shaped structure in each group of magnetic steel holes are symmetrically arranged along the radial direction of the rotor punching sheet, which can ensure that the magnetic lines of force formed by the permanent magnets in each group of magnetic steel holes are evenly distributed. The first section and the third section of the magnetic isolation hole extend into the fifth V-shaped structure and the sixth V-shaped structure respectively, so as to ensure the isolation effect of the magnetic isolation hole on the third V-shaped structure.

[0015] In one implementation, each first magnetic steel hole includes an arc-shaped magnetic isolation groove, each arc-shaped magnetic isolation groove is arranged on the angle side of the first magnetic steel hole in each third V-shaped structure, and the distance between the arc center of the radial arc-shaped magnetic isolation groove and the center hole along the rotor punching is greater than the distance between the arc-shaped magnetic isolation groove and the center hole.

[0016] In this implementation, the third V-shaped structure includes an angle side and an opening side, and the spacing between the two first magnetic steel holes along the circumference of the rotor punching sheet on the angle side is smaller than the spacing on the opening side. The arc-shaped magnetic isolation groove located on the angle side is used to guide the leakage magnetic path of the permanent magnets in the two first magnetic steel holes.

[0017] In one implementation, arc centers of two arc-shaped magnetic isolation grooves of two first magnetic steel holes in each third V-shaped structure coincide with each other.

[0018] In this implementation, the arc centers of the two arc-shaped magnetic isolation grooves coincide with each other, and the arc radii of the two arc-shaped magnetic isolation grooves are equal, so that a smoother leakage magnetic path can be formed to guide the magnetic lines of force to pass through.

[0019] In one implementation, the distance between the two arc-shaped magnetic isolation grooves along the circumferential direction of the rotor punching sheet is smaller than the length of the second section of the magnetic isolation hole used to isolate the third V-shaped structure.

[0020] In this implementation, the two arc-shaped magnetic isolation grooves are used to extend relatively along the circumferential direction of the rotor punching sheet to guide the magnetic lines of force of the permanent magnets in the two first magnetic steel holes in the third V-shaped structure to form a series closed loop along the leakage magnetic circuit.

[0021] In one implementation, the sum of the distance between the two arc-shaped magnetic isolation grooves along the circumferential direction of the rotor punching sheet and the length of the two arc-shaped magnetic isolation grooves is less than the length of the magnetic isolation hole used to isolate the third V-shaped structure.

[0022] In this implementation, the length of the magnetic isolation hole along the circumferential direction of the rotor punching sheet is greater than the length of the two arc-shaped magnetic isolation grooves to ensure the isolation effect of the magnetic isolation hole on the third V-shaped structure.

[0023] In one implementation, the second section of each magnetic isolation hole is arc-shaped, and the arc center of each second section coincides with the arc center of the arc-shaped magnetic isolation groove of at least one of the two first magnetic steel holes in the third V-shaped structure used for isolation of the magnetic isolation hole.

[0024] In this implementation, the second section of the magnetic isolation hole is parallel to the two arc-shaped magnetic isolation grooves, which can form a smoother leakage magnetic path to guide the magnetic lines of force to pass through.

[0025] In one implementation, the length of each first magnetic steel hole is greater than the length of each second magnetic steel hole, each first magnetic steel hole includes an isolation wall, and each first magnetic steel hole is separated by an isolation wall to form a first magnetic steel sub-hole and a second magnetic steel sub-hole, wherein each first magnetic steel sub-hole is arranged between a second magnetic steel sub-hole and a magnetic isolation hole, and the length of each first sub-magnetic steel hole is less than the length of each second sub-magnetic steel hole and less than the length of each second magnetic steel hole.

[0026] In this implementation, the isolation wall can be used to pass through the magnetic field lines to improve the anti-demagnetization ability of the permanent magnet in the first magnetic steel hole. In the scenario where a short circuit occurs in the drive motor and the current suddenly increases, the structure of the isolation wall can prevent the permanent magnet in the first magnetic steel hole from irreversible demagnetization.

[0027] In one implementation, a first section of each magnetic isolation hole is used to isolate a first magnetic steel sub-hole and a second magnetic steel hole in one group of magnetic steel holes in two adjacent groups of magnetic steel holes, and a third section of each magnetic isolation hole is used to isolate another first magnetic steel sub-hole and another second magnetic steel hole in another group of magnetic steel holes in two adjacent groups of magnetic steel holes.

[0028] In this implementation, because the first magnetic steel sub-hole is arranged between the magnetic isolation hole and the second magnetic steel sub-hole, the first section and the third section of the magnetic isolation hole are respectively used to isolate a first magnetic steel sub-hole and a second magnetic steel hole, and the magnetic isolation hole is also used to avoid the isolation wall of the two first magnetic steel holes.

[0029] In one implementation, along the length direction of the first magnetic steel hole, the length of a first magnetic steel sub-hole in each first magnetic steel hole is half of the length of a second magnetic steel sub-hole.

[0030] In one implementation, the length of each isolation wall is 1 mm.

[0031] The above two implementation methods are used to optimize the magnetic lines of force of the permanent magnet in the first magnetic steel hole through the structure of the isolation wall to ensure the anti-demagnetization ability of the permanent magnet in the first magnetic steel hole.

[0032] In one implementation method, a second magnetic steel hole in each group of magnetic steel holes is symmetrically arranged with another second magnetic steel hole in another adjacent group of magnetic steel holes to form a seventh V-shaped structure, the opening of each seventh V-shaped structure faces a center hole, and the two second magnetic steel holes in the seventh V-shaped structure are respectively arranged at intervals on both sides of the magnetic isolation hole along the circumference of the rotor punching.

[0033] In this implementation, the magnetic isolation holes along the circumference of the rotor sheet are arranged between the two second magnetic steel holes of the seventh V-shaped structure. The magnetic isolation holes are used to extend approximately along the circumference of the rotor sheet and form a leakage magnetic path for the permanent magnets in the two second magnetic steel holes.

[0034] In one implementation, each second magnetic steel hole includes a bent magnetic isolation groove, each bent magnetic isolation groove is arranged on the angle side of the second magnetic steel hole in each seventh V-shaped structure, and the circumferential bent magnetic isolation groove along the rotor punching is used to extend toward the magnetic isolation hole between two magnetic steel holes arranged in the seventh V-shaped structure.

[0035] In this implementation, the two bent magnetic isolation grooves are used to extend relatively along the circumferential direction of the rotor punching sheet to guide the magnetic field leakage magnetic path of the permanent magnets in the two second magnetic steel holes in the seventh V-shaped structure to form a parallel closed loop along the magnetic isolation holes.

[0036] In a second aspect, the present application provides a drive motor, which includes a motor stator and a motor rotor. The motor stator is sleeved outside the motor rotor, and the motor rotor includes a plurality of first permanent magnets, a plurality of second permanent magnets, and a plurality of rotor punchings provided in the first aspect of the present application. The plurality of rotor punchings are used to be arranged in sequence along the axial direction of the motor rotor, and the first magnetic steel holes in each magnetic steel hole in each rotor punching are used to be connected with the first magnetic steel holes in each magnetic steel hole in an adjacent rotor punching to form a plurality of first magnetic steel slots, and the second magnetic steel holes in each magnetic steel hole in each rotor punching are used to be connected with the second magnetic steel holes in each magnetic steel hole in an adjacent rotor punching to form a plurality of second magnetic steel slots, each first magnetic steel slot is used to accommodate and fix a first permanent magnet, and each second magnetic steel slot is used to accommodate and fix a second permanent magnet, and each first permanent magnet and each second permanent magnet are magnetized in parallel.

[0037] In the drive motor provided in the second aspect of the present application, the motor rotor is formed by the rotor punchings provided in the first aspect of the present application arranged in sequence along the axial direction. A plurality of first magnetic steel holes are spliced ​​to form a first magnetic steel slot and are used to accommodate and fix the first permanent magnet, and a second magnetic steel hole is spliced ​​to form a second magnetic steel slot and is used to accommodate and fix the second permanent magnet, and each group of magnetic steel slots is used to form a magnetic pole group. Thus, a plurality of magnetic pole groups of the motor rotor are arranged at intervals along the circumference of the motor rotor, and each magnetic isolation slot is aligned with the gap between two adjacent magnetic pole groups, so as to isolate two relatively close first permanent magnets in two adjacent magnetic pole groups from the outer peripheral surface of the motor rotor.

[0038] The torque output by the drive motor provided in the second aspect of the present application is relatively large. Because the first permanent magnet and the second permanent magnet are both magnetized in parallel, the motor rotor in the drive motor provided in the second aspect of the present application can form the leakage magnetic effect of the two adjacent second permanent magnets by adjusting the q-axis current of the motor stator as described in the first aspect of the present application. The motor rotor in the drive motor provided in the second aspect of the present application has a large speed regulation range, high reliability, is easy to control, and does not require additional demagnetization current.

[0039] In one implementation, the coercive force of the first permanent magnet is less than or equal to the coercive force of the second permanent magnet.

[0040] In a third aspect, the present application provides a power assembly, which includes a reducer and the drive motor provided in the second aspect of the present application, and the motor shaft of the drive motor is used for driving connection with the input shaft of the reducer.

[0041] In a fourth aspect, the present application provides a vehicle, comprising wheels, a transmission mechanism, and the powertrain provided in the third aspect of the present application, wherein the powertrain is used to drive the wheels through the transmission mechanism. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] In order to more clearly illustrate the technical solution of the present application, the drawings required for use in the implementation manner will be briefly introduced below. Obviously, the drawings described below are only some implementation manners of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0043] Figure 1 A schematic diagram of the structure of a vehicle provided in one embodiment of the present application;

[0044] Figure 2 A schematic diagram of a partial structure of a vehicle provided in one embodiment of the present application;

[0045] Figure 3 A schematic diagram of the structure of a driving motor provided in one embodiment of the present application;

[0046] Figure 4 This is a schematic diagram of the axial cross-sectional structure of a driving motor provided in one embodiment of the present application;

[0047] Figure 5 A schematic diagram of the structure of a motor stator provided in one embodiment of the present application;

[0048] Figure 6 A schematic diagram of the structure of a motor rotor provided in one embodiment of the present application;

[0049] Figure 7 A schematic diagram of the transverse cross-sectional structure of a motor rotor provided in one embodiment of the present application;

[0050] Figure 8 A schematic diagram of the planar structure of a single rotor punching sheet provided in one embodiment of the present application;

[0051] Fig. 9 A schematic diagram of the structure of one of the magnetic pole groups of a motor rotor provided in one embodiment of the present application;

[0052] Fig.10 A schematic diagram of the structure of two adjacent magnetic pole groups of a motor rotor provided in one embodiment of the present application;

[0053] Fig.11 This is a schematic diagram of the structure of a magnetic isolation hole provided in one embodiment of the present application;

[0054] Fig.12 A schematic diagram of the cross-sectional structure of a driving motor provided in one embodiment of the present application;

[0055] Fig.13 A schematic diagram of the distribution of magnetic lines of force of a drive motor in a magnetization state provided in one embodiment of the present application;

[0056] Fig.14 A schematic diagram of the distribution of magnetic lines of force of a drive motor in a weak magnetic state provided in one embodiment of the present application;

[0057] Fig.15 A schematic diagram of the angle of a V-shaped structure provided in one embodiment of the present application;

[0058] Fig.16 A schematic structural diagram of a fifth V-shaped structure and a sixth V-shaped structure provided in an embodiment of the present application;

[0059] Fig.17 A schematic structural diagram of two adjacent magnetic pole groups of a motor rotor provided in another embodiment of the present application;

[0060] Fig.18 A schematic structural diagram of two adjacent magnetic pole groups of a motor rotor provided in another embodiment of the present application;

[0061] Fig.19 It is a structural schematic diagram of a seventh V-shaped structure provided in an embodiment of the present application.

[0062] Figure numbers: 1000-vehicle; 1001-wheel; 1002-frame; 1003-transmission mechanism; 500-powertrain; 501-reducer; 5011-input shaft; 5012-output shaft; 502-motor controller; 200-drive motor; 201-motor shaft; 202-motor stator; 2021-stator core; 20211-stator teeth; 20212-stator yoke; 2 0213-stator slot; 2022-stator winding; 203-motor rotor; 2031-rotor core; 20311-magnetic steel slot; 20311a-first magnetic steel slot; 20311b-second magnetic steel slot; 2032-permanent magnet; 2032a-first permanent magnet; 2032b second permanent magnet; 2033-shaft hole; 2034-magnetic pole group; 2034a-first magnetic pole group; 2034b-second Two magnetic pole groups; 2035-magnetic isolation groove; 100-rotor punching plate; 10-magnetic steel hole; 10a-first group of magnetic steel holes; 10b-second group of magnetic steel holes; 11-first magnetic steel hole; 111-first magnetic steel hole A; 112-first magnetic steel hole B; 113-arc-shaped magnetic isolation groove; 114-isolation wall; 115-first magnetic steel sub-hole; 116-second magnetic steel sub-hole; 12-second magnetic steel hole; 121-second magnetic steel hole A; 122-second magnetic steel hole B; 123-bent magnetic isolation groove; 20-center hole; 30-magnetic isolation hole; 31-first section; 32-second section; 33-third section; V1-first V-shaped structure; V2-second V-shaped structure; V3-third V-shaped structure; V4-fourth V-shaped structure; V5-fifth V-shaped structure; V6-sixth V-shaped structure; V7-seventh V-shaped structure; 40-angle side; 50-opening side. DETAILED DESCRIPTION

[0063] The following will describe the technical solutions in the embodiments of the present application in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work belong to the scope of protection of this application.

[0064] The present application provides a rotor punching, which includes a central hole, multiple groups of magnetic steel holes and multiple magnetic isolation holes. The multiple groups of magnetic steel holes and the multiple magnetic isolation holes are arranged around the central hole along the circumference of the rotor punching, and each group of magnetic steel holes includes a pair of first magnetic steel holes and a pair of second magnetic steel holes. A central hole, each first magnetic steel hole, each second magnetic steel hole and each magnetic isolation hole penetrate the rotor punching along the axial direction of the rotor punching.

[0065] In the radial direction of the rotor punching, a pair of first magnetic steel holes in each group of magnetic steel holes are symmetrically arranged to form a first V-shaped structure, and a pair of second magnetic steel holes are symmetrically arranged to form a second V-shaped structure. Each second V-shaped structure is arranged between a first V-shaped structure and the outer peripheral surface of the rotor punching. The openings of each first V-shaped structure and each second V-shaped structure face away from a central hole, and a first magnetic steel hole in each group of magnetic steel holes is symmetrically arranged with another first magnetic steel hole in another adjacent group of magnetic steel holes to form a third V-shaped structure, and the opening of each third V-shaped structure faces a central hole.

[0066] Each magnetic isolation hole is used to isolate a third V-shaped structure from the outer peripheral surface of the rotor. Each magnetic isolation hole includes a first section, a second section and a third section. A first section in each magnetic isolation hole is connected to a third section through a second section. A first section and a third section in each magnetic isolation hole are symmetrically arranged along the radial direction of the rotor punching to form a fourth V-shaped structure. The opening of each fourth V-shaped structure faces a center hole along the radial direction of the rotor punching, and each fourth V-shaped structure is arranged between a third V-shaped structure and the outer peripheral surface of the rotor punching along the radial direction of the rotor punching.

[0067] The rotor punching provided in the present application is a unit constituting the rotor core in the motor rotor. The arrangement of the two V-shaped structures can increase the magnetic resistance torque and improve the torque output capacity of the drive motor. By adjusting the q-axis current of the motor stator, the leakage magnetic flux of the permanent magnets in the two adjacent second magnetic steel holes can be controlled, which broadens the speed regulation range of the motor rotor and does not require additional demagnetization current.

[0068] The present application provides a drive motor, which includes a motor stator and a motor rotor. The motor stator is sleeved outside the motor rotor. The motor rotor includes a plurality of first permanent magnets, a plurality of second permanent magnets, and a plurality of rotor punchings provided in the first aspect of the present application. The plurality of rotor punchings are used to be arranged in sequence along the axial direction of the motor rotor. The first magnetic steel holes in each magnetic steel hole in each rotor punching are used to be connected with the first magnetic steel holes in each magnetic steel hole in an adjacent rotor punching to form a plurality of first magnetic steel slots. The second magnetic steel holes in each magnetic steel hole in each rotor punching are used to be connected with the second magnetic steel holes in each magnetic steel hole in an adjacent rotor punching to form a plurality of second magnetic steel slots. Each first magnetic steel slot is used to accommodate and fix a first permanent magnet. Each second magnetic steel slot is used to accommodate and fix a second permanent magnet. Each first permanent magnet and each second permanent magnet are magnetized in parallel.

[0069] The drive motor provided in the present application has a large output torque, a large speed regulation range of the motor rotor, high reliability, easy control and no need for additional demagnetization current.

[0070] The present application provides a powertrain, which includes a reducer and a drive motor provided by the present application, wherein the motor shaft of the drive motor is used for transmission connection with the input shaft of the reducer. The powertrain provided by the present application has a large speed regulation range, high reliability, and has the advantages of high efficiency and energy saving.

[0071] The present application provides a vehicle, the vehicle includes wheels, a transmission mechanism and a powertrain provided by the present application, the powertrain is used to drive the wheels through the transmission mechanism. The vehicle provided by the present application has high energy utilization, a large speed regulation range and high reliability.

[0072] See also Figure 1 A schematic diagram of the structure of a vehicle 1000 provided in one embodiment of the present application is shown.

[0073] like Figure 1 As shown, the vehicle 1000 provided in the present application includes wheels 1001 and a power assembly 500, and the wheels 1001 and the power assembly 500 are both installed on a frame 1002 of the vehicle 1000. The power assembly 500 is used to drive the wheels 1001 to rotate relative to the frame 1002 to achieve the driving of the vehicle 1000.

[0074] In one embodiment, the vehicle 1000 provided in the present application includes a transmission mechanism 1003 , which is used to transmit and connect the powertrain 500 and the wheel 1001 so as to reliably transmit the driving force provided by the powertrain 500 to the wheel 1001 .

[0075] In one embodiment, the vehicle 1000 provided in the present application may include one or more powertrains 500. One powertrain 500 may drive one wheel 1001 or multiple wheels 1001 to rotate. Figure 1 In the illustration, the vehicle 1000 provided in the present application includes a power assembly 500, which is transmission-connected to two wheels 1001 of the vehicle 1000 for driving the two wheels 1001 to rotate.

[0076] Please see Figure 2 A schematic diagram of the partial structure of a vehicle 1000 provided in one embodiment of the present application is shown.

[0077] like Figure 2 As shown, the power assembly 500 provided in the present application includes a drive motor 200, which is connected to two wheels 1001 through a transmission mechanism 1003. The driving force output by the drive motor 200 can be transmitted to the two wheels 1001 through the transmission mechanism 1003, driving the two wheels 1001 to rotate.

[0078] In one embodiment, the powertrain 500 provided in the present application includes a reducer 501, and the motor shaft 201 of the drive motor 200 is used for transmission connection with the input shaft 5011 of the reducer 501. The rotation of the motor shaft 201 can drive the input shaft 5011 of the reducer 501 to rotate, so that the power output by the drive motor 200 is transmitted to the input shaft 5011 of the reducer 501. The axial direction of the input shaft 5011 of the reducer 501 is parallel to the axial direction of the wheel 1001. The output shaft 5012 of the reducer 501 is transmission connected with the wheel 1001. The reducer 501 is used to change the transmission ratio between the drive motor 200 and the wheel 1001. That is, the drive motor 200 is used to adjust the torque and speed of the driving force output by the drive motor 200, and transmit the adjusted driving force to the wheel 1001. Specifically, the reducer 501 can reduce the rotation speed of the output shaft 5012 to reduce the rotation speed of the wheel 1001, and can amplify the driving force output by the motor shaft 201 of the drive motor 200, thereby improving the stability and safety of the vehicle 1000 provided in this application under different road conditions and driving speeds.

[0079] In one embodiment, the powertrain 500 provided in the present application further includes a motor controller 502, which is used to receive direct current from the power battery and output alternating current to the drive motor 200. The drive motor 200 is used to receive the alternating current output by the motor controller 502 and drive the wheel 1001 to rotate.

[0080] In one embodiment, the drive motor 200 provided in the present application includes a permanent magnet synchronous motor. Based on the advantages of the permanent magnet synchronous motor, such as high torque density, low loss, high efficiency, simple structure, and reliable operation, the permanent magnet synchronous motor is used to provide driving force for the wheels 1001 of the vehicle 1000 provided in the present application, which can improve the energy utilization rate and endurance of the vehicle 1000 and reduce costs. In addition, it is also beneficial for the vehicle 1000 to cope with complex driving scenarios such as rapid start, acceleration, climbing, and high-speed operation.

[0081] Please see Figure 3 The structural diagram of the drive motor 200 provided in one embodiment of the present application is shown, and Figure 4 The figure shows an axial cross-sectional structure diagram of a driving motor 200 provided in one embodiment of the present application.

[0082] like Figure 3 and Figure 4As shown, the drive motor 200 provided in the present application includes a motor stator 202 and a motor rotor 203. The motor stator 202 is sleeved outside the motor rotor 203, and the motor rotor 203 is sleeved and fixed outside the motor shaft 201, and the motor rotor 203 can rotate relative to the motor stator 202 around the axis of the motor shaft 201. When the drive motor 200 provided in the present application is working, the motor stator 202 is fed with three-phase alternating current to form an alternating magnetic field to drive the motor rotor 203 to rotate. When the motor rotor 203 rotates, it can drive the motor shaft 201 to rotate, and the drive motor 200 outputs the driving force through the motor shaft 201.

[0083] For details, please refer to Figure 5 The structure diagram of the motor stator 202 provided in one embodiment of the present application is shown.

[0084] like Figure 5 As shown, the motor stator 202 includes a stator core 2021 and a stator winding (not shown in the figure). The stator winding is fixed to the stator core 2021 and is used to generate an alternating magnetic field of the motor stator 202. Among them, the stator core 2021 of the motor stator 202 includes a plurality of stator teeth 20211 and a stator yoke 20212. Along the radial direction of the motor shaft 201, the stator teeth 20211 are located between the stator yoke 20212 and the motor rotor 203, and an air gap is provided between the stator teeth 20211 and the motor rotor 203. The plurality of stator teeth 20211 are arranged at intervals along the circumferential direction of the motor shaft 201. The gap between two adjacent stator teeth 20211 forms a stator slot 20213. The stator winding is wound around the stator teeth 20211 and accommodated in the stator slot 20213, and the stator winding can generate an alternating magnetic field by passing a three-phase alternating current.

[0085] Please see Figure 6 The structural diagram of the motor rotor 203 provided in one embodiment of the present application is shown, and Figure 7 The figure shows a schematic diagram of the transverse cross-sectional structure of a motor rotor 203 provided in one embodiment of the present application.

[0086] like Figure 6 and Figure 7 As shown, the motor rotor 203 includes a rotor core 2031 and a permanent magnet 2032. The rotor core 2031 includes a magnetic steel slot 20311, and the magnetic steel slot 20311 penetrates the rotor core 2031 along the axial direction of the rotor core 2031. The magnetic steel slot 20311 is used to accommodate and fix the permanent magnet 2032. The permanent magnet 2032 has a magnetic force, which is used to magnetize the rotor core 2031, so that the motor rotor 203 can rotate around the axis of the motor shaft 201 of the drive motor 200 in response to the alternating magnetic field of the motor stator 202 to output a driving force.

[0087] The rotor core 2031 is provided with an axial hole 2033 extending in the axial direction, and the motor shaft 201 is passed through the axial hole 2033 and fixedly connected to the rotor core 2031, so as to rotate along with the rotation of the rotor core 2031. In the illustrated embodiment, the axial length of the motor shaft 201 is greater than the axial length of the stator core 2021, and the end of the motor shaft 201 extending out of the stator core 2021 is used for transmission connection to the input shaft 5011 of the reducer 501. In other embodiments, the input shaft 5011 of the reducer 501 is used to extend into the axial hole 2033 of the rotor core 2031 and be transmission connected to the motor shaft 201.

[0088] In one embodiment, the permanent magnets 2032 of the motor rotor 203 in the drive motor 200 provided in the present application are magnetized in parallel.

[0089] In one embodiment, the motor rotor 203 provided in the present application includes a plurality of first permanent magnets 2032a, a plurality of second permanent magnets 2032b, a plurality of first magnetic steel slots 20311a, and a plurality of second magnetic steel slots 20311b. Each first magnetic steel slot 20311a is used to accommodate and fix a first permanent magnet 2032a, and each second magnetic steel slot 20311b is used to accommodate and fix a second permanent magnet 2032b.

[0090] In one embodiment, the first permanent magnet 2032a and the second permanent magnet 2032b are magnetized in parallel.

[0091] In one embodiment, the coercive force of the first permanent magnet 2032a is less than or equal to the coercive force of the second permanent magnet 2032b.

[0092] In one embodiment, two adjacent first magnetic steel slots 20311a, two adjacent second magnetic steel slots 20311b, two first permanent magnets 2032a, and two second permanent magnets 2032b are used to form a magnetic pole group 2034. Figure 7 In the schematic diagram, a magnetic pole group 2034 is the area encircled by the dotted circle in the figure. Multiple magnetic pole groups 2034 are arranged in intervals around the shaft hole 2033 of the motor rotor 203 along the circumference of the motor rotor 203. The number of magnetic pole groups 2034 is an even number, for example Figure 7 In the illustration, the number of magnetic pole groups 2034 is six.

[0093] The rotor core 2031 includes a plurality of magnetic isolation slots 2035, each of which penetrates the rotor core 2031 along the axial direction of the rotor core 2031. Along the circumferential direction of the motor rotor 203, each magnetic isolation slot 2035 is aligned with the gap between two adjacent magnetic pole groups 2034, and is used to isolate two relatively close first permanent magnets 2032a in two adjacent magnetic pole groups 2034 from the outer circumferential surface of the motor rotor 203.

[0094] In some scenarios, the vehicle 1000 needs to climb a slope at a low speed, and the drive motor 200 needs to have a higher magnetic flux and a stronger magnetic field to output a larger torque to improve the climbing ability of the vehicle 1000. In other scenarios, the vehicle 1000 needs to travel at a high speed, and the drive motor 200 needs to have a lower magnetic flux and a weaker magnetic field to ensure that the drive motor 200 effectively outputs torque and ensures the safety of the drive motor 200. That is, in order to meet more than 1000 complex driving scenarios of the vehicle, the drive motor 200 needs to have the ability to adjust the magnetic flux to widen the speed regulation range.

[0095] In one embodiment, the rotor core 2031 includes a rotor punching 100, the number of which is multiple, and the rotor punching 100 may be cylindrical. The multiple rotor punchings 100 are used to be arranged in sequence along the axial direction of the motor shaft 201, and the axes of the multiple rotor punchings 100 coincide with each other. Each rotor punching 100 is provided with multiple magnetic steel holes 10, a center hole 20, and multiple magnetic isolation holes 30. The multiple magnetic steel holes 10, the center hole 20, and the multiple magnetic isolation holes 30 penetrate the rotor punching 100 along the axial direction of the rotor punching 100 respectively. The center holes 20 of each rotor punching 100 are connected in sequence along the axis of the rotor punching 100 to form the shaft hole 2033 of the above-mentioned rotor core 2031. The multiple magnetic steel holes 10 and the multiple magnetic isolation holes 30 are arranged in intervals around a center hole 20 along the circumference of the rotor punching 100. The relative positions and sizes of the magnetic steel holes 10 of each rotor punching 100 are equal, and each magnetic steel hole 10 is sequentially connected along the axis of the rotor punching 100 to form each magnetic steel slot 20311 of the rotor core 2031. The relative positions and sizes of the magnetic isolation holes 30 of each rotor punching 100 are equal, and each magnetic isolation hole 30 is sequentially connected along the axis of the rotor punching 100 to form each magnetic isolation slot 2035 of the rotor core 2031.

[0096] The rotor punching 100 is a basic unit assembled into the rotor core 2031. The following will take a single rotor punching 100 as an example to describe the solution of the embodiment of the present application in detail.

[0097] Please see Figure 8 The diagram shown is a schematic plan view of the structure of a single rotor punching sheet 100 provided in one embodiment of the present application.

[0098] like Figure 8As shown, the rotor punching 100 provided in the present application includes a center hole 20, multiple groups of magnetic steel holes 10 and multiple magnetic isolation holes 30. Multiple groups of magnetic steel holes 10 and multiple magnetic isolation holes 30 are arranged around a center hole 20 along the circumference of the rotor punching 100. Each group of magnetic steel holes 10 includes a pair of first magnetic steel holes 11 and a pair of second magnetic steel holes 12. A center hole 20, each first magnetic steel hole 11, each second magnetic steel hole 12 and each magnetic isolation hole 30 respectively penetrate the rotor punching 100 along the axial direction of the rotor punching 100.

[0099] The magnetic steel holes 10 are used to accommodate and fix the permanent magnets 2032. Specifically, the permanent magnets 2032 include a plurality of first permanent magnets 2032a and a plurality of second permanent magnets 2032b. The first magnetic steel holes 11 in any two adjacent rotor punchings 100 are aligned and connected to form a first magnetic steel slot 20311a for fixing a first permanent magnet 2032a, and the second magnetic steel holes 12 in any two adjacent rotor punchings 100 are aligned and connected to form a second magnetic steel slot 20311b for fixing a second permanent magnet 2032b.

[0100] For details, please refer to Fig. 9 The structure diagram of one of the magnetic pole groups 2034 of the motor rotor 203 provided in one embodiment of the present application is shown.

[0101] like Fig. 9 As shown, along the radial direction of the rotor punching 100, a pair of first magnetic steel holes 11 in each group of magnetic steel holes 10 are symmetrically arranged to form a first V-shaped structure V1. That is, the two first magnetic steel holes 11 in each group of magnetic steel holes 10 are arranged at intervals, and the two first magnetic steel holes 11 are symmetrical about a radial direction of the rotor punching 100 to form the first V-shaped structure V1. A pair of second magnetic steel holes 12 in each group of magnetic steel holes 10 are symmetrically arranged to form a second V-shaped structure V2. That is, the two second magnetic steel holes 12 in each group of magnetic steel holes 10 are arranged at intervals, and the two second magnetic steel holes 12 are symmetrical about a radial direction of the rotor punching 100 to form a second V-shaped structure V2. Each first V-shaped structure V1 and each second V-shaped structure V2 are symmetrical relative to a radial direction of the rotor punching 100, that is, each first V-shaped structure V1 and each second V-shaped structure V2 have the same symmetry axis.

[0102] Along the radial direction of the rotor punching 100, each second V-shaped structure V2 is arranged between a first V-shaped structure V1 and the outer peripheral surface of the rotor punching 100. The opening direction of each first V-shaped structure V1 and each second V-shaped structure V2 is away from a central hole 20. The two magnetic steel holes 10 in each V-shaped structure are arranged to form an angle side 40 and an opening side 50. Along the circumferential direction of the rotor punching 100, the end with a smaller spacing between the two magnetic steel holes 10 is the angle side 40, and the end with a larger spacing is the opening side 50. Therefore, illustratively, the opening direction of each first V-shaped structure V1 and each second V-shaped structure V2 is away from a central hole 20, which can be interpreted as that along the radial direction of the rotor punching 100, the angle side 40 of the first V-shaped structure V1 is arranged between the central hole 20 and the opening side 50. That is, along the circumference of the rotor punching 100, the two ends of the two first magnetic steel holes 11 with a smaller spacing are arranged close to the center hole 20 relative to the outer circumference of the rotor punching 100, and the two ends of the two second magnetic steel holes 12 with a smaller spacing are arranged close to the center hole 20 relative to the outer circumference of the rotor punching 100.

[0103] A first magnetic steel hole 11 in each group of magnetic steel holes 10 is symmetrically arranged with another first magnetic steel hole 11 in another adjacent group of magnetic steel holes 10 to form a third V-shaped structure V3 , and the opening of each third V-shaped structure V3 faces a central hole 20 .

[0104] For details, please refer to Fig.10 The structure diagram of two adjacent magnetic pole groups 2034 of the motor rotor 203 provided in one embodiment of the present application is shown.

[0105] like Fig.10 As shown, for the convenience of introduction, two adjacent magnetic pole groups 2034 are defined as the first magnetic pole group 2034a and the second magnetic pole group 2034b in the clockwise direction of the figure. In the two adjacent magnetic pole groups 2034, two adjacent groups of magnetic steel holes 10 are defined as the first group of magnetic steel holes 10a and the second group of magnetic steel holes 10b in the clockwise direction of the figure. The two first magnetic steel holes 11 in each group of magnetic steel holes 10 are defined as the first magnetic steel hole A111 and the first magnetic steel hole B112 in the clockwise direction of the figure. The first magnetic steel hole B112 in the first magnetic pole group 2034a and the first magnetic steel hole A111 in the first magnetic pole group 2034a are symmetrically arranged to form a third V-shaped structure V3. And the two ends with a smaller distance between the first magnetic steel hole B112 in the first magnetic pole group 2034a and the first magnetic steel hole A111 in the second magnetic pole group 2034b are arranged relative to the center hole 20 close to the outer circumference of the rotor punching 100.

[0106] Each magnetic isolation hole 30 is used to isolate a third V-shaped structure V3 from the outer circumference of the rotor punching 100. Fig.11The structure diagram of the magnetic isolation hole 30 provided in one embodiment of the present application is shown.

[0107] like Fig.11 As shown, each magnetic isolation hole 30 includes a first section 31, a second section 32 and a third section 33. A first section 31 in each magnetic isolation hole 30 is connected to a third section 33 through a second section 32, and a first section 31 and a third section 33 in each magnetic isolation hole 30 are symmetrically arranged along the radial direction of the rotor punching 100 to form a fourth V-shaped structure V4. The opening of each fourth V-shaped structure V4 faces a center hole 20 along the radial direction of the rotor punching 100, that is, the opening side 50 of the fourth V-shaped structure V4 is arranged between the center hole 20 and the angle side 40. Each fourth V-shaped structure V4 is arranged between a third V-shaped structure V3 and the outer peripheral surface of the rotor punching 100 along the radial direction of the rotor punching 100.

[0108] The rotor punching sheet 100 provided in the present application includes a plurality of groups of spaced magnetic steel holes 10 along the circumferential direction. A pair of first magnetic steel holes 11 and a pair of second magnetic steel holes 12 in each group of magnetic steel holes 10 are arranged to form two V-shaped structures. The orientations of the two V-shaped structures are both away from a central hole 20. The two adjacent first magnetic steel holes 11 in the two adjacent groups of magnetic steel holes 10 also form a third V-shaped structure V3, and each magnetic isolation hole 30 is used to isolate a third V-shaped structure V3 from the outer peripheral surface of the rotor punching sheet 100. Based on the fact that the magnetic permeability of the air in the magnetic isolation hole 30 is lower than the magnetic permeability of the rotor punching sheet 100 body, the magnetic isolation hole 30 can be used as a magnetic barrier to reduce the magnetic flux passing through the magnetic isolation hole 30. Among them, the first section 31 and the third section 33 of each magnetic isolation hole 30 form a fourth V-shaped structure V4, and are arranged between the third V-shaped structure V3 and the outer peripheral surface of the rotor punching sheet 100, which can ensure the isolation effect of the magnetic isolation hole 30 on the third V-shaped structure V3.

[0109] The rotor punching 100 provided in the present application is a unit constituting the rotor core 2031 in the motor rotor 203. Each magnetic steel hole 10 of the rotor punching 100 can be used to accommodate the permanent magnet 2032, and the arrangement of the two V-shaped structures can increase the magnetic resistance torque and improve the torque output capacity of the drive motor 200. Since the magnetic resistance of the magnetic isolation hole 30 is higher than the magnetic resistance of the rotor punching 100 body, and the motor rotor 203 follows the principle of minimum magnetic resistance, that is, the magnetic flux is always closed along the path of minimum magnetic resistance. Therefore, the present application optimizes the structure and arrangement of the magnetic isolation hole 30 and the magnetic steel hole 10, and then optimizes the magnetic circuit, so that each magnetic isolation hole 30 can be used to suppress the leakage of the permanent magnet 2032 in the two first magnetic steel holes 11 in a third V-shaped structure V3, and can promote the leakage of the permanent magnet 2032 in the two adjacent second magnetic steel holes 12 in the two adjacent groups of magnetic steel holes 10.

[0110] When the q-axis current of the motor stator 202 is relatively large, the magnetic flux of the permanent magnet 2032 in the first magnetic steel hole 11 and the second magnetic steel hole 12 is superimposed and returns after passing through the motor stator 202 to form a closed loop; when the q-axis current of the motor stator 202 is relatively small, the permanent magnets 2032 in the two first magnetic steel holes 11 in the third V-shaped structure V3 form a series closed loop through the leakage magnetic magnetic circuit, and the permanent magnets 2032 in the second magnetic steel hole 12 form a parallel closed loop through the leakage magnetic magnetic circuit. Therefore, by adjusting the q-axis current of the motor stator 202, the leakage magnetic flux of the permanent magnets 2032 in the two adjacent second magnetic steel holes 12 can be controlled, which broadens the speed regulation range of the motor rotor 203 and does not require additional demagnetization current.

[0111] For details, please refer to Fig.12 The cross-sectional structure diagram of the drive motor 200 provided in one embodiment of the present application is shown in FIG. Fig.13 The schematic diagram of the distribution of magnetic lines of force of the drive motor 200 in the magnetization state provided in one embodiment of the present application is shown, and Fig.14 The diagram shown is a schematic diagram of the distribution of magnetic lines of force of a drive motor 200 in a weak magnetic state provided in one embodiment of the present application.

[0112] like Figure 12 to Figure 14 As shown, the stator core 2021 of the motor stator 202 includes a plurality of stator teeth 20211 and a plurality of stator yokes 20212. Along the radial direction of the motor shaft 201, the stator teeth 20211 are located between the stator yoke 20212 and the motor rotor 203. And the plurality of stator teeth 20211 are arranged at intervals along the circumferential direction of the motor shaft 201. The gap between two adjacent stator teeth 20211 forms a stator slot 20213. The stator winding 2022 is wound around the stator teeth 20211 and accommodated in the stator slot 20213. An air gap is provided between the stator teeth 20211 and the motor rotor 203.

[0113] For ease of description, the permanent magnetic flux of the permanent magnet 2032 is defined to start from the north pole of the permanent magnet 2032 in the first magnetic steel hole 11 and the permanent magnet 2032 in the second magnetic steel hole 12. Therefore, the operating principle of the drive motor 200 provided in the present application can be explained as follows: if the q-axis current of the motor stator 202 is large, the magnetization directions of the permanent magnets 2032 in the first magnetic steel hole 11 and the second magnetic steel hole 12 are the same, and the permanent magnet 2032 in the first magnetic steel hole 11 is in a magnetization state. The permanent magnetic fluxes of the permanent magnets 2032 in the first magnetic steel hole 11 and the second magnetic steel hole 12 are superimposed and flow in the same direction, most of which pass through the air gap to reach the stator teeth 20211, and then pass through the stator yoke 20212 from the stator teeth 20211. Then, it returns to the south pole of the permanent magnets 2032 in the second magnetic steel hole 12 and the first magnetic steel hole 11 of the adjacent magnetic pole group 2034 from the adjacent stator teeth 20211 and the air gap in turn. During this process, a small portion passes between the magnetic isolation hole 30 and the third V-shaped structure V3 to form a closed loop.

[0114] If the q-axis current of the motor stator 202 is small, the magnetization directions of the permanent magnets 2032 in the first magnetic steel hole 11 and the second magnetic steel hole 12 are opposite, and the permanent magnets 2032 in the first magnetic steel hole 11 are in a weak magnetic state. Most of the permanent magnetic flux forms leakage magnetic flux on the leakage magnetic circuit, and only a small part passes through the air gap and the motor stator 202 and returns to the south pole of the permanent magnets 2032 in the second magnetic steel hole 12 and the first magnetic steel hole 11. On the leakage magnetic circuit, part of the permanent magnetic flux of the permanent magnet 2032 in the first magnetic steel hole 11 passes through the magnetic isolation hole 30 and the third V-shaped structure V3 and returns to the permanent magnet 2032 in the first magnetic steel hole 11 of the adjacent magnetic pole group 2034 to form a leakage magnetic flux closed loop. At the same time, after a part of the permanent magnetic flux of the permanent magnet 2032 in the first magnetic steel hole 11 merges with the permanent magnetic flux of the permanent magnet 2032 in the second magnetic steel hole 12, it passes through the magnetic isolation hole 30 and the air gap back to the permanent magnet 2032 in the second magnetic steel hole 12 of the adjacent magnetic pole group 2034 to form a leakage magnetic flux closed loop. Thus, a series-parallel connection of the leakage magnetic path is formed, so that the drive motor 200 can have a larger speed regulation range and output torque.

[0115] Thus, the rotor core 2031 formed by the rotor punching sheet 100 provided in the present application can realize the change of the magnetic circuit based on the q-axis current of the motor stator 202 when running in the drive motor 200 of the present application. When the q-axis current of the motor stator 202 is large, the magnetic flux of the permanent magnet 2032 in the first magnetic steel hole 11 and the second magnetic steel hole 12 is superimposed and returns after passing through the motor stator 202 to form a closed loop; when the q-axis current of the motor stator 202 is small, the permanent magnets 2032 in the two first magnetic steel holes 11 in the third V-shaped structure V3 form a series closed loop through the leakage magnetic magnetic circuit, and the permanent magnets 2032 in the second magnetic steel hole 12 form a parallel closed loop through the leakage magnetic magnetic circuit. Then, by adjusting the q-axis current of the motor stator 202, the leakage magnetic flux of the permanent magnets 2032 in the two adjacent second magnetic steel holes 12 can be controlled, which broadens the speed regulation range of the motor rotor 203 and does not require additional demagnetization current.

[0116] In one embodiment, the included angle of each first V-shaped structure V1 and the included angle of each second V-shaped structure V2 are away from a central hole 20 along the radial direction of the rotor punching 100. The included angle of each first V-shaped structure V1 is greater than the included angle of each second V-shaped structure V2, the included angle of each third V-shaped structure V3 and the included angle of each fourth V-shaped structure V4 are toward a central hole 20 along the radial direction of the rotor punching 100, the included angle of each third V-shaped structure V3 is smaller than the included angle of each fourth V-shaped structure V4, the included angle of each third V-shaped structure V3 is smaller than the included angle of each first V-shaped structure V1, and the included angle of each second V-shaped structure V2 is smaller than the included angle of each fourth V-shaped structure V4.

[0117] For details, please refer to Fig.15 A schematic diagram of the angle of a V-shaped structure provided in one embodiment of the present application is shown.

[0118] like Fig.15As shown, the included angle of the two first magnetic steel holes 11 in the first V-shaped structure V1 is θ1, that is, the included angle of the first V-shaped structure V1 is θ1. The included angle of the two second magnetic steel holes 12 in the second V-shaped structure V2 is θ2, that is, the included angle of the second V-shaped structure V2 is θ2. The included angle θ1 of the first V-shaped structure V1 is greater than the included angle θ2 of the second V-shaped structure V2. In the third V-shaped structure V3, the included angle of the first magnetic steel hole B112 of the first magnetic pole group 2034a and the first magnetic steel hole A111 of the second magnetic pole group 2034b is θ3, that is, the included angle of the third V-shaped structure V3 is θ3. In the fourth V-shaped structure V4, the included angle of the first section 31 and the third section 33 of the magnetic isolation hole 30 is θ4, that is, the included angle of the fourth V-shaped structure V4 is θ4. The angle θ3 of the third V-shaped structure V3 is smaller than the angle θ4 of the fourth V-shaped structure V4. The angle θ3 of the third V-shaped structure V3 is smaller than the angle θ1 of the first V-shaped structure V1. The angle θ2 of the second V-shaped structure V2 is smaller than the angle θ4 of the fourth V-shaped structure V4.

[0119] It can be understood that the angle θ1 of the first V-shaped structure V1 in each group of magnetic steel holes 10 is set to be greater than the angle θ2 of the second V-shaped structure V2, the angle θ3 of the third V-shaped structure V3 in two adjacent groups of magnetic steel holes 10 is smaller than the angle θ1 of the first V-shaped structure V1, and the angle θ4 of the fourth V-shaped structure V4 is smaller than the angle θ2 of the second V-shaped structure V2, so as to guide the magnetic lines of force to extend along a preset direction toward the outer peripheral surface of the rotor punching 100. The angle θ3 of the third V-shaped structure V3 in two adjacent groups of magnetic steel holes 10 is smaller than the angle θ4 of the fourth V-shaped structure V4 of the magnetic isolation hole 30, so as to ensure the isolation effect of the magnetic isolation hole 30 on the third V-shaped structure V3.

[0120] In one embodiment, a first magnetic steel hole 11 and a second magnetic steel hole 12 in each group of magnetic steel holes 10 are arranged to form a fifth V-shaped structure V5, another first magnetic steel hole 11 and another second magnetic steel hole 12 in each group of magnetic steel holes 10 are arranged to form a sixth V-shaped structure V6, and a fifth V-shaped structure V5 and a sixth V-shaped structure V6 in each group of magnetic steel holes 10 are symmetrically arranged along the radial direction of the rotor punching 100. A first section 31 of each magnetic isolation hole 30 extends into an opening of a fifth V-shaped structure V5 in one group of magnetic steel holes 10, and a third section 33 of each magnetic isolation hole 30 extends into an opening of a sixth V-shaped structure V6 in another group of magnetic steel holes 10, and one group of magnetic steel holes 10 and another group of magnetic steel holes 10 are arranged adjacent to each other along the circumferential direction of the rotor punching 100.

[0121] For details, please refer to Fig.16 A schematic structural diagram of a fifth V-shaped structure V5 and a sixth V-shaped structure V6 provided in one embodiment of the present application is shown.

[0122] like Fig.16 As shown, for the convenience of introduction, the two second magnetic steel holes 12 in each group of magnetic steel holes 10 are defined as the second magnetic steel hole A121 and the second magnetic steel hole B122 in the clockwise direction of the figure. The first magnetic steel hole A111 and the second magnetic steel hole A121 in each group of magnetic steel holes 10 are arranged to form a fifth V-shaped structure V5. The first magnetic steel hole B112 and the second magnetic steel hole B122 in each group of magnetic steel holes 10 are arranged to form a sixth V-shaped structure V6. The fifth V-shaped structure V5 and the sixth V-shaped structure V6 are symmetrically arranged along the radial direction of the rotor punching 100. The first section 31 of the magnetic isolation hole 30 extends into the opening of the fifth V-shaped structure V5 in the second magnetic pole group 2034b, and the third section 33 of the magnetic isolation hole 30 extends into the opening of the sixth V-shaped structure V6 of the first magnetic pole group 2034a.

[0123] It can be understood that a fifth V-shaped structure V5 and a sixth V-shaped structure V6 in each group of magnetic steel holes 10 are symmetrically arranged along the radial direction of the rotor punching 100, which can ensure that the magnetic lines of force formed by the permanent magnets 2032 in each group of magnetic steel holes 10 are evenly distributed. The first section 31 and the third section 33 of the magnetic isolation hole 30 extend into the openings of the fifth V-shaped structure V5 and the sixth V-shaped structure V6, respectively, so as to form a good surrounding effect on the third V-shaped structure V3 through the magnetic isolation hole 30, thereby ensuring the isolation effect of the magnetic isolation hole 30 on the third V-shaped structure V3.

[0124] In one embodiment, each first magnetic steel hole 11 includes an arc-shaped magnetic isolation groove 113, and each arc-shaped magnetic isolation groove 113 is arranged at an angle side 40 of the first magnetic steel hole 11 in each third V-shaped structure V3. The distance between the arc center of the arc-shaped magnetic isolation groove 113 and the central hole 20 is greater than the distance between the arc-shaped magnetic isolation groove 113 and the central hole 20.

[0125] For details, please refer to Fig.17 The structure diagram of two adjacent magnetic pole groups 2034 of the motor rotor 203 provided in another embodiment of the present application is shown.

[0126] like Fig.17As shown, the third V-shaped structure V3 includes an angle side 40 and an opening side 50, and the angle side 40 is away from the center hole 20 relative to the opening side 50. Along the circumference of the rotor punching 100, the spacing between the two first magnetic steel holes 11 in the third V-shaped structure V3 on the angle side 40 is smaller than the spacing on the opening side 50. The arc-shaped magnetic isolation groove 113 is arranged on the angle side 40 of the first magnetic steel hole 11 in the third V-shaped structure V3, that is, the arc-shaped magnetic isolation groove 113 is located at the end of the first magnetic steel hole 11 relatively far away from the center hole 20. Along the radial direction of the rotor punching 100, the distance between the arc center of the arc-shaped magnetic isolation groove 113 and the center hole 20 is greater than the distance between the arc-shaped magnetic isolation groove 113 and the center hole 20. That is, the arc-shaped magnetic isolation groove 113 is bent in the direction away from the center hole 20. The arc-shaped magnetic isolation groove 113 located at the angle side 40 is used to guide the leakage magnetic path of the permanent magnets 2032 in the two first magnetic steel holes 11 in the third V-shaped structure V3.

[0127] In one embodiment, the arc centers of the two arc-shaped magnetic isolation grooves 113 of the two first magnetic steel holes 11 in each third V-shaped structure V3 coincide with each other. That is, the arc-shaped magnetic isolation groove 113 of the first magnetic steel hole B112 in the first magnetic pole group 2034a coincides with the arc-shaped magnetic isolation groove 113 of the first magnetic steel hole A111 in the second magnetic pole group 2034b. It can be understood that the arc centers of the two arc-shaped magnetic isolation grooves 113 coincide with each other, that is, the arc radii of the two arc-shaped magnetic isolation grooves 113 are equal, which can form a smoother leakage magnetic magnetic circuit to guide the magnetic lines of force to pass through.

[0128] In one embodiment, the arc center of the second section 32 coincides with the arc center of the two arc-shaped magnetic isolation grooves 113 of the two first magnetic steel holes 11 in the third V-shaped structure V3. At this time, the arc shape of the second section 32 is equal to the spacing distance between the two arc-shaped magnetic isolation grooves 113, and the leakage magnetic circuit formed thereby can guide the magnetic lines of force to pass more smoothly.

[0129] In one embodiment, along the circumferential direction of the rotor sheet 100, the distance between the two arc-shaped magnetic isolation grooves 113 is less than the length of the second section 32 of the magnetic isolation hole 30 used to isolate the third V-shaped structure V3. It can be understood that in this embodiment, the two arc-shaped magnetic isolation grooves 113 are used to extend relatively along the circumferential direction of the rotor sheet 100 to guide the magnetic field lines of the permanent magnets 2032 in the two first magnetic steel holes 11 in the third V-shaped structure V3 to form a series closed loop along the leakage magnetic circuit.

[0130] In one embodiment, along the circumference of the rotor punching 100, the sum of the spacing between the two arc-shaped magnetic isolation grooves 113 and the length of the two arc-shaped magnetic isolation grooves 113 is less than the length of the magnetic isolation hole 30 used to isolate the third V-shaped structure V3. That is, the sum of the length of the arc-shaped magnetic isolation groove 113 of the first magnetic steel hole B112 in the first magnetic pole group 2034a, the length of the arc-shaped magnetic isolation groove 113 of the first magnetic steel hole A111 in the second magnetic pole group 2034b, and the spacing between the two arc-shaped magnetic isolation grooves 113 is less than the sum of the lengths of the first section 31, the second section 32, and the third section 33 of the magnetic isolation hole 30. It can be understood that along the circumference of the rotor punching 100, the length dimension of the magnetic isolation hole 30 is set to be greater than the sum of the length and spacing of the two arc-shaped magnetic isolation grooves 113, so as to ensure the isolation effect of the magnetic isolation hole 30 on the third V-shaped structure V3.

[0131] In one embodiment, the second section 32 of each magnetic isolation hole 30 is arc-shaped, and the arc center of each second section 32 coincides with the arc center of the arc-shaped magnetic isolation groove 113 of at least one of the two first magnetic steel holes 11 in the third V-shaped structure V3 used for isolation by the magnetic isolation hole 30. Exemplarily, the second section 32 of each magnetic isolation hole 30 coincides with the arc center of the arc-shaped magnetic isolation groove 113 of the first magnetic steel hole B112 in the first magnetic pole group 2034a, and coincides with the arc center of the arc-shaped magnetic isolation groove 113 of the first magnetic steel hole A111 in the second magnetic pole group 2034b. That is, the second section 32 of the magnetic isolation hole 30 is parallel to the two arc-shaped magnetic isolation grooves 113, which can form a smoother leakage magnetic magnetic circuit to guide the magnetic lines of force to pass through.

[0132] Please see Fig.18 The structure diagram of two adjacent magnetic pole groups 2034 of the motor rotor 203 provided in another embodiment of the present application is shown.

[0133] like Fig.18 As shown, the length of each first magnetic steel hole 11 is greater than the length of each second magnetic steel hole 12. Each first magnetic steel hole 11 includes a separation wall 114. Each first magnetic steel hole 11 is separated by a separation wall 114 to form a first magnetic steel sub-hole 115 and a second magnetic steel sub-hole 116. Each first magnetic steel sub-hole 115 is arranged between a second magnetic steel sub-hole 116 and a magnetic isolation hole 30. That is, along the radial direction of the rotor punching 100, the minimum distance between the first magnetic steel sub-hole 115 and the center hole 20 is greater than the maximum distance between the second magnetic steel sub-hole 116 and the center hole 20. The length of each first sub-magnetic steel hole 10 is less than the length of each second sub-magnetic steel hole 10 and less than the length of each second magnetic steel hole 12.

[0134] It can be understood that the isolation wall 114 can be used to pass through the magnetic field lines to improve the anti-demagnetization ability of the permanent magnet 2032 in the first magnetic steel hole 11. In the scenario where a short circuit fault occurs in the drive motor 200 and the current suddenly increases, the structure of the isolation wall 114 can prevent the permanent magnet 2032 in the first magnetic steel hole 11 from irreversible demagnetization.

[0135] In one embodiment, a first section 31 of each magnetic isolation hole 30 is used to isolate a first magnetic steel sub-hole 115 and a second magnetic steel hole 12 in one magnetic steel hole 10 of two adjacent groups of magnetic steel holes 10. A third section 33 of each magnetic isolation hole 30 is used to isolate another first magnetic steel sub-hole 115 and another second magnetic steel hole 12 in another group of magnetic steel holes 10 of two adjacent groups of magnetic steel holes 10. Exemplarily, the first section 31 of the magnetic isolation hole 30 is used to isolate the first magnetic steel sub-hole 115 in the first magnetic steel hole A111 in the second magnetic pole group 2034b from the second magnetic steel hole A121 in the second magnetic pole group 2034b. The third section 33 of the magnetic isolation hole 30 is used to isolate the first magnetic steel sub-hole 115 in the first magnetic steel hole B112 in the first magnetic pole group 2034a from the second magnetic steel hole B122 in the first magnetic pole group 2034a.

[0136] Because the first magnetic steel sub-hole 115 is arranged between the magnetic isolation hole 30 and the second magnetic steel sub-hole 116, the first section 31 and the third section 33 of the magnetic isolation hole 30 are respectively used to isolate a first magnetic steel sub-hole 115 and a second magnetic steel hole 12, and the magnetic isolation hole 30 is also used to avoid the isolation wall 114 of the two first magnetic steel holes 11.

[0137] In one embodiment, along the length direction of the first magnetic steel hole 11, the length of a first magnetic steel sub-hole 115 in each first magnetic steel hole 11 is half of the length of a second magnetic steel sub-hole 116. That is, along the length direction of the first magnetic steel hole 11, the ratio of the length of the first magnetic steel sub-hole 115 to the length of the second magnetic steel sub-hole 116 is 1:2. At this time, the isolation wall 114 can allow more magnetic lines of force to pass through, thereby forming a better protection effect on the permanent magnet 2032 in the first magnetic steel hole 11.

[0138] In one embodiment, the length of each isolation wall 114 is 1 mm.

[0139] It can be understood that the above two embodiments are used to optimize the magnetic lines of force of the permanent magnet 2032 in the first magnetic steel hole 11 through the structure of the isolation wall 114 to ensure the anti-demagnetization ability of the permanent magnet 2032 in the first magnetic steel hole 11.

[0140] In one embodiment, a second magnetic steel hole 12 in each group of magnetic steel holes 10 is symmetrically arranged with another second magnetic steel hole 12 in another adjacent group of magnetic steel holes 10 to form a seventh V-shaped structure V7. The opening of each seventh V-shaped structure V7 faces a central hole 20, and along the circumferential direction of the rotor punching 100, the two second magnetic steel holes 12 of V7 in the seventh V-shaped structure are respectively arranged at intervals on both sides of the magnetic isolation hole 30.

[0141] Exemplary, please cooperate Fig.19 A schematic structural diagram of a seventh V-shaped structure V7 provided in one embodiment of the present application is shown.

[0142] like Fig.19 As shown, the second magnetic steel holes B122 in the first group of magnetic steel holes 10a and the second magnetic steel holes A121 in the second group of magnetic steel holes 10b are arranged to form a seventh V-shaped structure V7. The opening of each seventh V-shaped structure V7 faces a central hole 20, and along the circumferential direction of the rotor punching 100, in the seventh V-shaped structure V7, the second magnetic steel holes B122 and the second magnetic steel holes A121 are arranged at intervals on both sides of the magnetic isolation hole 30.

[0143] The magnetic isolation holes 30 are arranged between the two second magnetic steel holes 12 of the seventh V-shaped structure V7 along the circumference of the rotor punching 100. The magnetic isolation holes 30 are used to extend approximately along the circumference of the rotor punching 100 and form a leakage magnetic path of the permanent magnets 2032 in the two second magnetic steel holes 12 of the seventh V-shaped structure V7.

[0144] In one embodiment, each second magnetic steel hole 12 includes a bent magnetic isolation groove 123. Each bent magnetic isolation groove 123 is arranged at an angle side 40 of the second magnetic steel hole 12 in each seventh V-shaped structure V7, and along the circumferential direction of the rotor punching 100, the bent magnetic isolation groove 123 is used to extend toward the magnetic isolation hole 30 between two magnetic steel holes 10 arranged in the seventh V-shaped structure V7.

[0145] The two bent magnetic isolation grooves 123 in the seventh V-shaped structure V7 are used to extend relatively along the circumferential direction of the rotor punching 100 to guide the magnetic field leakage magnetic path of the permanent magnets 2032 in the two second magnetic steel holes 12 in the seventh V-shaped structure V7 to form a parallel closed loop along the magnetic isolation hole 30.

[0146] In one embodiment, the distance between the first section 31 of the magnetic isolation hole 30 and the permanent magnet 2032 in the adjacent second magnetic steel hole 12 is 1.5 mm.

[0147] In one embodiment, the distance between the third section 33 of the magnetic isolation hole 30 and the permanent magnet 2032 in the adjacent second magnetic steel hole 12 is 1.5 mm.

[0148] Obviously, those skilled in the art can make various changes and modifications to the present application without departing from the scope of protection of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is also intended to include these modifications and variations.

Claims

1. A rotor punching, characterized in that: The rotor punching sheet comprises a central hole, multiple groups of magnetic steel holes and multiple magnetic isolation holes, the multiple groups of magnetic steel holes and the multiple magnetic isolation holes are respectively arranged around the central hole along the circumference of the rotor punching sheet, each group of magnetic steel holes comprises a pair of first magnetic steel holes and a pair of second magnetic steel holes, the central hole, each of the first magnetic steel holes, each of the second magnetic steel holes and each of the magnetic isolation holes respectively penetrate the rotor punching sheet along the axial direction of the rotor punching sheet, wherein: Along the radial direction of the rotor punching sheet, a pair of the first magnetic steel holes in each group of the magnetic steel holes are symmetrically arranged to form a first V-shaped structure, a pair of the second magnetic steel holes are symmetrically arranged to form a second V-shaped structure, each of the second V-shaped structures is arranged between a first V-shaped structure and the outer peripheral surface of the rotor punching sheet, and the openings of each of the first V-shaped structures and each of the second V-shaped structures face away from the one center hole, and one of the first magnetic steel holes in each group of the magnetic steel holes is symmetrically arranged with another of the first magnetic steel holes in another adjacent group of the magnetic steel holes to form a third V-shaped structure, and the opening of each of the third V-shaped structures faces the one center hole; Each of the magnetic isolation holes is used to isolate one of the third V-shaped structures from the outer circumference of the rotor punching. Each of the magnetic isolation holes includes a first section, a second section and a third section. In each of the magnetic isolation holes, one of the first sections is connected to one of the third sections via one of the second sections. In each of the magnetic isolation holes, one of the first sections and one of the third sections are symmetrically arranged along the radial direction of the rotor punching to form a fourth V-shaped structure. The opening of each of the fourth V-shaped structures faces the one of the center holes along the radial direction of the rotor punching. Each of the fourth V-shaped structures is arranged between one of the third V-shaped structures and the outer circumference of the rotor punching along the radial direction of the rotor punching.

2. The rotor punching according to claim 1, characterized in that: The included angle of each first V-shaped structure and the included angle of each second V-shaped structure are away from the one center hole in the radial direction of the rotor punching, the included angle of each first V-shaped structure is greater than the included angle of each second V-shaped structure, the included angle of each third V-shaped structure and the included angle of each fourth V-shaped structure are toward the one center hole in the radial direction of the rotor punching, the included angle of each third V-shaped structure is smaller than the included angle of each fourth V-shaped structure, the included angle of each third V-shaped structure is smaller than the included angle of each first V-shaped structure, and the included angle of each second V-shaped structure is smaller than the included angle of each fourth V-shaped structure.

3. The rotor punching sheet according to any one of claims 1 to 2, characterized in that: One of the first magnetic steel holes and one of the second magnetic steel holes in each group of the magnetic steel holes are arranged to form a fifth V-shaped structure, another of the first magnetic steel holes and another of the second magnetic steel holes in each group of the magnetic steel holes are arranged to form a sixth V-shaped structure, and one of the fifth V-shaped structure and one of the sixth V-shaped structure in each group of the magnetic steel holes are symmetrically arranged along the radial direction of the rotor punching sheet; The first section of each of the magnetic isolation holes extends into an opening of the fifth V-shaped structure in one group of the magnetic steel holes, and the third section of each of the magnetic isolation holes extends into an opening of the sixth V-shaped structure in another group of the magnetic steel holes. The one group of magnetic steel holes and the other group of magnetic steel holes are arranged adjacent to each other along the circumferential direction of the rotor punching.

4. The rotor punching according to any one of claims 1 to 3, characterized in that: Each of the first magnetic steel holes includes an arc-shaped magnetic isolation groove, and each of the arc-shaped magnetic isolation grooves is arranged on the angle side of the first magnetic steel hole in each of the third V-shaped structures. Along the radial direction of the rotor punching, the distance between the arc center of the arc-shaped magnetic isolation groove and the center hole is greater than the distance between the arc-shaped magnetic isolation groove and the center hole.

5. The rotor punching according to claim 4, characterized in that: The arc centers of the two arc-shaped magnetic isolation grooves of the two first magnetic steel holes in each of the third V-shaped structures coincide with each other.

6. The rotor punching according to claim 4 or 5, characterized in that: Along the circumferential direction of the rotor punching: The distance between the two arc-shaped magnetic isolation grooves is smaller than the length of the second section of the magnetic isolation hole used to isolate the third V-shaped structure; The sum of the distance between the two arc-shaped magnetic isolation grooves and the length of the two arc-shaped magnetic isolation grooves is smaller than the length of the magnetic isolation hole used to isolate the third V-shaped structure.

7. The rotor punching according to any one of claims 4 to 6, characterized in that: The second section of each magnetic isolation hole is arc-shaped, and the arc center of each second section coincides with the arc center of the arc-shaped magnetic isolation groove of at least one of the two first magnetic steel holes in the third V-shaped structure used to isolate the magnetic isolation hole.

8. The rotor punching according to any one of claims 1 to 7, characterized in that: The length of each of the first magnetic steel holes is greater than the length of each of the second magnetic steel holes, each of the first magnetic steel holes comprises a separation wall, and each of the first magnetic steel holes is separated by the separation wall to form a first magnetic steel sub-hole and a second magnetic steel sub-hole, wherein: Each first magnetic steel sub-hole is arranged between one of the second magnetic steel sub-holes and one of the magnetic isolation holes, and the length of each of the first sub-magnetic steel holes is smaller than the length of each of the second sub-magnetic steel holes and smaller than the length of each of the second magnetic steel holes.

9. The rotor punching according to claim 8, characterized in that: The first section of each magnetic isolation hole is used to isolate one of the first magnetic steel sub-holes and one of the second magnetic steel holes in one of the two adjacent groups of magnetic steel holes, and the third section of each magnetic isolation hole is used to isolate another of the first magnetic steel sub-holes and another of the second magnetic steel holes in the other group of magnetic steel holes in the two adjacent groups of magnetic steel holes.

10. The rotor punching according to claim 8 or 9, characterized in that: Along the length direction of the first magnetic steel hole: The length of one first magnetic steel sub-hole in each of the first magnetic steel holes is half of one second magnetic steel sub-hole; The length of each of the isolation walls is 1 mm.

11. The rotor punching according to any one of claims 1 to 10, characterized in that: One of the second magnetic steel holes in each group of the magnetic steel holes is symmetrically arranged with another of the second magnetic steel holes in another adjacent group of the magnetic steel holes to form a seventh V-shaped structure, the opening of each of the seventh V-shaped structures faces the one center hole, and along the circumference of the rotor punching, the two second magnetic steel holes in the seventh V-shaped structure are respectively arranged at intervals on both sides of the magnetic isolation hole.

12. The rotor punching according to claim 11, characterized in that: Each of the second magnetic steel holes includes a bent magnetic isolation groove, and each of the bent magnetic isolation grooves is arranged on the angle side of the second magnetic steel hole in each of the seventh V-shaped structures. The bent magnetic isolation groove along the circumference of the rotor punching is used to extend toward the magnetic isolation hole between two of the magnetic steel holes arranged in the seventh V-shaped structure.

13. A driving motor, characterized in that: The drive motor includes a motor stator and a motor rotor, wherein the motor stator is sleeved outside the motor rotor, and the motor rotor includes a plurality of first permanent magnets, a plurality of second permanent magnets, and a plurality of rotor punchings as described in any one of claims 1 to 12, wherein the plurality of rotor punchings are used to be arranged in sequence along the axial direction of the motor rotor, and the first magnetic steel holes in each of the magnetic steel holes in the rotor punchings are used to be connected with the first magnetic steel holes in each of the magnetic steel holes in the adjacent rotor punchings to form a plurality of first magnetic steel slots, and the second magnetic steel holes in each of the magnetic steel holes in the rotor punchings are used to be connected with the second magnetic steel holes in each of the magnetic steel holes in the adjacent rotor punchings to form a plurality of second magnetic steel slots, and each of the first magnetic steel slots is used to accommodate and fix one of the first permanent magnets, and each of the second magnetic steel slots is used to accommodate and fix one of the second permanent magnets, and each of the first permanent magnets and each of the second permanent magnets are magnetized in parallel.

14. A powertrain, characterized in that: The power assembly includes a reducer and a drive motor as claimed in claim 13, wherein a motor shaft of the drive motor is used for driving connection with an input shaft of the reducer.

15. A vehicle, characterized in that: The vehicle comprises wheels, a transmission mechanism and the powertrain as claimed in claim 14, wherein the powertrain is used to drive the wheels through the transmission mechanism.

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