Rotor punching sheet, rotor, motor, power system and vehicle

Abstract

The invention provides a rotor punching sheet, a rotor, a motor, a power system and a vehicle. The rotor punching sheet comprises a punching sheet body, the punching sheet body is provided with a shaft hole and a plurality of magnet grooves, and the plurality of magnet grooves are arranged around the shaft hole at intervals; the part, opposite to the magnet groove, of the outer peripheral wall of the punching sheet body comprises a first middle arc section, a first side arc section and a second side arc section, and the first middle arc section is located between the first side arc section and the second side arc section; each magnet groove comprises a permanent magnet section and a magnetic isolation section, the permanent magnet sections are communicated with the magnetic isolation sections, and each magnet groove is provided with a first end and a second end in the circumferential direction of the rotor punching sheet; the radius corresponding to the first middle arc section is recorded as R1, the width of the permanent magnet section in the direction from the first end to the second end is recorded as w, the number of pole pairs of the motor is recorded as p, and 0.32 * pi * R1 / p < = w < = 0.75 * pi * R1 / p.

Description

Technical Field

[0001] The present application relates to the technical field of motors, and more particularly, to a rotor punching sheet, a rotor, a motor, a power system, and a vehicle. Background Art

[0002] In the related art, the electromagnetic structure layout of a concentrated winding motor is not reasonable, resulting in low torque output quality of the motor, magnetic leakage phenomenon, high torque ripple, and the performance of the motor needs to be improved. Summary of the Invention

[0003] The present application aims to solve at least one of the technical problems existing in the prior art or related technologies.

[0004] To this end, a first aspect of the present application provides a rotor punching sheet.

[0005] A second aspect of the present application provides a rotor.

[0006] A third aspect of the present application provides a motor.

[0007] A fourth aspect of the present application provides a power system.

[0008] A fifth aspect of the present application provides a vehicle.

[0009] In view of this, a first aspect of the present application provides a rotor punching sheet, including: a punching sheet body, the punching sheet body is provided with a shaft hole and a plurality of magnet slots, and the plurality of magnet slots are arranged at intervals around the shaft hole; a portion of the outer peripheral wall of the punching sheet body opposite to the magnet slots includes a first intermediate arc segment, a first side arc segment, and a second side arc segment, and the first intermediate arc segment is located between the first side arc segment and the second side arc segment; the magnet slot includes a permanent magnet segment and a magnetic isolation segment, the permanent magnet segment is communicated with the magnetic isolation segment, and the magnet slot has a first end and a second end in the circumferential direction of the rotor punching sheet; the radius corresponding to the first intermediate arc segment is denoted as R1, the width of the permanent magnet segment in the direction from the first end to the second end is denoted as w, and the number of pole pairs of the motor is denoted as p, where 0.32×π×R1 / p ≤ w ≤ 0.75×π×R1 / p.

[0010] A rotor punching sheet provided by the present application includes a punching sheet body, the punching sheet body is provided with a shaft hole and a plurality of magnet slots, and the plurality of magnet slots are arranged at intervals around the shaft hole.

[0011] A portion of the outer peripheral wall of the punching sheet body opposite to the magnet slots includes a first intermediate arc segment, a first side arc segment, and a second side arc segment, wherein the first intermediate arc segment is located between the first side arc segment and the second side arc segment.

[0012] A shaft hole is provided in the middle of the punching sheet body, and the shaft hole is used to accommodate the rotating shaft of the motor. A plurality of magnet slots are arranged on the punching sheet body at intervals around the shaft hole, and each magnet slot penetrates through the punching sheet body axially, and the magnet slot is used to accommodate the permanent magnet of the motor.

[0013] The magnet slots include permanent magnet segments and magnetic isolation segments, that is, each magnet slot includes a permanent magnet segment and a magnetic isolation segment. The permanent magnet segment and the magnetic isolation segment are in communication with each other. The permanent magnet segment is used to accommodate the permanent magnets of the rotor, and the permanent magnets are embedded in the permanent magnet segment. There are no permanent magnets in the magnetic isolation segment, that is, the magnetic isolation segment is empty.

[0014] Among them, the width of the permanent magnet located in the permanent magnet segment is associated with the number of motor pole pairs and the maximum radius of the motor (that is, the radius corresponding to the first intermediate arc segment), so that the width of the permanent magnet can be set within a reasonable range, avoiding problems such as too small width of the permanent magnet, resulting in insufficient output performance of the motor, large content of third harmonic of the magnetomotive force waveform, and large end leakage of the permanent magnet.

[0015] The radius corresponding to the first intermediate arc segment is denoted as R1, the width of the permanent magnet segment in the first end to the second end direction is denoted as w, and the number of motor pole pairs is denoted as p. By limiting the relationship among R1, w, and p to satisfy 0.32×π×R1 / p ≤ w ≤ 0.75×π×R1 / p, in this way, not only the utilization rate of the permanent magnet is increased, the quality of the output torque of the motor is improved, and the torque ripple is suppressed, but also high power density and high efficiency can be achieved, which is beneficial to reducing the production cost of the product.

[0016] It can be understood that the motor includes a stator core, a rotor core, a plurality of permanent magnets, and a rotating shaft. The stator core and the rotor core are coaxially arranged, the stator core is arranged outside the rotor core, and there is an air gap between the stator core and the rotor core. The size of the air gap can be selected according to the process level and the deformation amount of the rotor core. Optionally, along the direction from the rotor core to the stator core, the value of the air gap is greater than or equal to 0.5 mm.

[0017] The stator includes a stator core and windings, and the rotor includes a rotor core and permanent magnets. Windings are provided in the stator core, permanent magnets are provided in the rotor core, and the rotor core is formed by stacking a plurality of rotor punching sheets. When the motor operates in the motor mode, it can convert electrical energy into mechanical energy. The specific principle is: the controller converts the direct current of the battery into three-phase alternating current required by the motor. After three-phase alternating current is passed into the windings of the stator, a tangential magnetic field pulling force will be generated between the stator and the rotor, causing the rotor to rotate, thereby generating mechanical torque to drive the electric vehicle to move forward.

[0018] It is commonly used in the P3 motor under the hybrid system or the main drive motor in the pure electric drive system. When the motor operates in the generator mode, the rotor of the motor is connected to the engine through a rotating shaft or a belt. The engine rotates to drive the rotor to rotate. The windings of the stator will generate induced current in the alternating stator magnetic field, thereby converting the mechanical energy of the engine into electrical energy. The electrical energy is fed back to the battery or used to drive the motor, and is commonly used in the P1 motor of the hybrid or the extended-range system.

[0019] According to the rotor punching sheet described above in the present application, the following additional technical features may also be included:

[0020] In some embodiments, optionally, the radius corresponding to the first side arc segment is denoted as R2, where 2 ≤ R1 / R2 ≤ 5.5.

[0021] In this embodiment, the rotor punching sheet provided by the present application includes a punching sheet body and a plurality of magnet slots. The outer peripheral wall of the punching sheet body includes a first intermediate arc segment, a first side arc segment, and a second side arc segment. The radius corresponding to the first intermediate arc segment is denoted as R1, and the radius corresponding to the first side arc segment is denoted as R2.

[0022] The radius R1 corresponding to the first intermediate arc segment and the radius R2 corresponding to the first side arc segment satisfy: 2 ≤ R1 / R2 ≤ 5.5. The outer peripheral wall of the punching sheet body includes an outer peripheral segment on the axial end face, and the outer peripheral segment is a closed line segment.

[0023] The outer peripheral wall of the punching sheet body includes a plurality of sequentially connected arc segment groups, and one arc segment group corresponds to one magnet slot. It should be noted that the number of arc segment groups and the number of magnet slots are both equal to the number of pole pairs p of the motor.

[0024] It can be understood that the outer peripheral segment includes a plurality of connected arc segment groups, and one arc segment group corresponds to one magnet slot. It should be noted that the number of arc segment groups and the number of magnet slots are both equal to the number of magnetic poles p of the motor.

[0025] By making each arc segment group include at least the first intermediate arc segment, the first side arc segment, and the second side arc segment, for the motor, an unequal air gap that changes periodically in the circumferential direction can be formed between the outer peripheral wall of the rotor and the inner peripheral wall of the stator. Thus, an alternation between the first side arc segment, the first intermediate arc segment, and the second side arc segment can be formed on the outer peripheral wall of the rotor punching sheet, which can make the operation of the motor more stable. At the same time, the magnetic field distribution of the rotor is optimized, and the direct and quadrature axis armature reactions are effectively weakened. On the basis of ensuring the unchanged peak torque of the motor, the torque ripple of the motor is significantly improved, the running vibration noise of the motor is reduced, and the user's comfort during use is improved.

[0026] At the same time, the iron losses of the stator and rotor of the motor are also reduced to a certain extent, which is beneficial to improving the efficiency of the motor.

[0027] Meanwhile, by reasonably setting the relationship between the radius R1 corresponding to the first intermediate arc segment and the radius R2 corresponding to the first side arc segment in this application to satisfy 2 ≤ R1 / R2 ≤ 5.5, not only the advantages of the integral circular design and pure eccentric design of the rotor punching sheet are taken into account, but also on the basis of not changing the average air gap length of the motor and ensuring that the peak torque of the motor remains unchanged, the air gap magnetic field can be effectively improved, the air gap magnetic density and the sinusoidality of the back electromotive force waveform can be increased, the harmonic ratio can be reduced, and thus the torque ripple is beneficial to be reduced, and the vibration and noise of the motor are significantly reduced.

[0028] In some embodiments, optionally, either the first side arc segment or the second side arc segment is connected to the first intermediate arc segment; the center of the circle corresponding to the first intermediate arc segment coincides with the center of the shaft hole; the center of the circle corresponding to either the first side arc segment or the second side arc segment is arranged separately from the center of the shaft hole, and the centers of the circles corresponding to the first side arc segment and the second side arc segment are located on the same circumference; either the first side arc segment or the second side arc segment is symmetrically arranged with respect to the magnetic pole center line.

[0029] In this embodiment, the mating structure of the first side arc segment, the second side arc segment and the first intermediate arc segment is further defined.

[0030] On the rotor punching sheet, the first intermediate arc segment is respectively connected to the first side arc segment and the second side arc segment, and the center of the circle corresponding to either the first side arc segment or the second side arc segment is arranged separately from the center of the shaft hole, and the centers of the circles corresponding to the first side arc segment and the second side arc segment are located on the same circumference.

[0031] Thereby, a three-segment combined arc can be formed on the outer peripheral wall of the rotor punching sheet, and the distances from the center of the shaft hole of the rotor punching sheet to different parts of the outer peripheral wall are different, so that an unequal air gap can be formed between the rotor and the stator.

[0032] Either the first side arc segment or the second side arc segment is symmetrically arranged with respect to the magnetic pole center line. That is, the first side arc segment is symmetrically arranged with respect to the magnetic pole center line, and the second side arc segment is symmetrically arranged with respect to the magnetic pole center line. It can be understood that the magnetic pole center line coincides with a radial line on the rotor punching sheet.

[0033] Either the first side arc segment or the second side arc segment is symmetrically arranged with respect to the magnetic pole center line, which can prevent the even harmonics that exacerbate the motor NVH (Noise, Vibration, Harshness) from occurring in the motor. At the same time, each magnetic pole is a symmetric structure, which is conducive to the quality control in the production process.

[0034] In some embodiments, optionally, the number of magnetic isolation segments is two, and the permanent magnet segment is connected between the two magnetic isolation segments; in the magnet slot, the connection points of the permanent magnet segment and the two magnetic isolation segments away from the shaft hole are respectively denoted as the first vertex and the second vertex. The first radial extension line passing through the center of the shaft hole intersects or is tangent to the first vertex, and the second radial extension line passing through the center of the shaft hole intersects or is tangent to the second vertex. The included angle formed by the first radial extension line and the second radial extension line is denoted as a; wherein, a and p satisfy: 0.63×360 / p ≤ a ≤ 0.87×360 / p.

[0035] In this embodiment, the number of magnetic isolation segments is two, the permanent magnet segment is located between the two magnetic isolation segments, and any one of the two magnetic isolation segments is connected to the permanent magnet segment, and any one of the two magnetic isolation segments communicates with the permanent magnet segment.

[0036] In a motor (such as, a permanent magnet synchronous motor), the air-gap synthetic magnetic field in the motor includes a fundamental magnetic field and a harmonic magnetic field, and the content and proportion of the fundamental magnetic field and the harmonic magnetic field in the air-gap synthetic magnetic field directly determine the torque output ability and the noise reduction performance of the motor.

[0037] Moreover, the larger the fundamental magnetic field, the smaller the harmonic magnetic field, the higher the torque output, and the better the noise reduction performance of the motor. On the contrary, the smaller the output torque, the worse the noise reduction performance.

[0038] The connection points of the permanent magnet segment and the two magnetic isolation segments away from the shaft hole are respectively denoted as the first vertex A1 and the second vertex A2. The first radial extension line passes through the center of the shaft hole, and the first radial extension line intersects or is tangent to the first vertex A1. The second radial extension line passes through the center of the shaft hole, and the second radial extension line intersects or is tangent to the second vertex A2. The included angle formed by the first radial extension line and the second radial extension line is a.

[0039] The magnitudes of the fundamental magnetic field and the harmonic magnetic field in the air-gap magnetic field are directly related to the pole arc angle (i.e., the included angle a) in the rotor, and the value range of the included angle a is associated with the number of pole pairs of the rotor. The number of pole pairs is the number of groups of permanent magnets. Since the number of pole pairs of different motors may be different, the angle of the pole arc angle will also change. Simply limiting the angle range of the pole arc angle is likely to deviate from the change of the rotor structure. That is, the value range of the pole arc angle is related to the number of pole pairs, which can further improve the accuracy of determining the value range of the pole arc angle.

[0040] When a and p satisfy 0.63×360 / p ≤ a ≤ 0.87×360 / p, the waveform of the air-gap synthetic magnetic field can be optimized, the content of the harmonic magnetic field in the air-gap magnetic field can be effectively reduced, the waveform of the air-gap magnetic field can approach a sine waveform, thereby reducing the cogging torque and torque ripple of the permanent magnet synchronous motor, and reducing the vibration and noise of the motor. Moreover, when the content of the harmonic magnetic field is reduced, the iron loss generated by the high-frequency harmonic magnetic field can be reduced, the iron loss of the motor in the high-speed range can be reduced, the output torque and efficiency of the motor can be improved, which is beneficial to improving the service performance of the motor.

[0041] In some embodiments, optionally, the part of the lamination core body between the magnet slot and the outer peripheral wall of the lamination core body is the first magnetic isolation bridge. The width of the first magnetic isolation bridge in the direction from the magnet slot to the outer peripheral wall of the lamination core body is denoted as d1, and the thickness of the lamination core body is denoted as d2, where d1 ≥ 2×d2.

[0042] In this embodiment, the structure of the lamination core body is further defined such that the part of the lamination core body between the magnet slot and the outer peripheral wall of the lamination core body is the first magnetic isolation bridge. Along the direction from the magnet slot to the outer peripheral wall of the lamination core body, the width of the first magnetic isolation bridge is denoted as d1. The thickness of the lamination core body is denoted as d2, where d1 ≥ 2×d2.

[0043] Specifically, any one of the multiple magnet slots includes a permanent magnet segment and a magnetic isolation segment. The permanent magnet segment and the magnetic isolation segment are connected to each other. The permanent magnet segment is used to accommodate the permanent magnet of the rotor, and the permanent magnet is embedded in the permanent magnet segment. There is no permanent magnet in the magnetic isolation segment, that is, the magnetic isolation segment is empty.

[0044] The magnetic isolation segment is connected to both sides of the permanent magnet segment. Among them, the part of the lamination core body between the magnet slot and the outer peripheral wall of the lamination core body is the first magnetic isolation bridge. The width of the first magnetic isolation bridge is associated with the electromagnetic performance and strength performance of the motor. Setting the width of the first magnetic isolation bridge within the above range can avoid the situation that due to the too small width of the first magnetic isolation bridge, the production and preparation process is too difficult and the possibility of deformation of the rotor lamination during the operation of the motor is increased. It can significantly suppress the magnetic leakage phenomenon of the rotor permanent magnetic field passing through the first magnetic isolation bridge, reduce the magnetic leakage magnetic density at the first magnetic isolation bridge, and increase the utilization rate of the permanent magnet. Thus, on the basis of improving the motor performance, the quality of the output torque of the motor can be improved, the torque pulsation can be suppressed, and high power density and high efficiency can be achieved.

[0045] In some embodiments, optionally, the magnet slot includes multiple sub-slots, and the multiple sub-slots are arranged at intervals along the circumferential direction of the rotor lamination. Any one of the multiple sub-slots includes a permanent magnet segment and two magnetic isolation segments, and the permanent magnet segment is connected between the two magnetic isolation segments; in the magnet slot, the part of the lamination core body between two adjacent sub-slots is the second magnetic isolation bridge. The length of the second magnetic isolation bridge in the circumferential direction of the rotor lamination is denoted as d3, and the thickness of the lamination core body is denoted as d2, where d3 ≥ 2×d2.

[0046] In this embodiment, the structure of the punching sheet body is further defined such that the magnet groove includes a plurality of sub-grooves, and the plurality of sub-grooves are arranged at intervals in the circumferential direction of the rotor punching sheet. Any one of the plurality of sub-grooves includes a permanent magnet segment and two magnetic isolation segments, that is, each sub-groove includes a permanent magnet segment and two magnetic isolation segments.

[0047] The permanent magnet segment is connected between the two magnetic isolation segments.

[0048] In the magnet groove, the part of the punching sheet body located between two adjacent sub-grooves is the second magnetic isolation bridge. Along the circumferential direction of the rotor punching sheet, the length of the second magnetic isolation bridge is denoted as d3. The thickness of the punching sheet body is denoted as d2, where d3 ≥ 2 × d2.

[0049] Specifically, any one of the plurality of magnet grooves includes a permanent magnet segment and a magnetic isolation segment. The permanent magnet segment and the magnetic isolation segment are interconnected. The permanent magnet segment is used to accommodate the permanent magnet of the rotor, and the permanent magnet is embedded in the permanent magnet segment. No permanent magnet is provided in the magnetic isolation segment, that is, the magnetic isolation segment is empty.

[0050] The magnetic isolation segment is connected on both sides of the permanent magnet segment. Among them, the part of the punching sheet body located between two adjacent sub-grooves is the second magnetic isolation bridge, and the length of the second magnetic isolation bridge is associated with the electromagnetic performance and strength performance of the motor. By setting the length of the second magnetic isolation bridge within the above range, it is possible to avoid the excessive difficulty in the production and preparation process and the increased possibility of deformation of the rotor punching sheet during the operation of the motor due to the too small length of the second magnetic isolation bridge. It can significantly suppress the magnetic leakage phenomenon of the rotor permanent magnetic field passing through the second magnetic isolation bridge, reduce the magnetic leakage magnetic density at the second magnetic isolation bridge, and increase the utilization rate of the permanent magnet. Thus, on the basis of improving the motor performance, the quality of the output torque of the motor can be improved, torque ripple can be suppressed, and high power density and high efficiency can be achieved.

[0051] In some embodiments, optionally, the punching sheet body is provided with a plurality of weight-reducing holes, and the plurality of weight-reducing holes are arranged at intervals. The weight-reducing holes are located on the magnetic pole center line or the inter-pole center line of the punching sheet body.

[0052] In this embodiment, the structure of the punching sheet body is further defined such that the punching sheet body is provided with a plurality of weight-reducing holes, and the plurality of weight-reducing holes are arranged at intervals. The weight-reducing holes are located on the magnetic pole center line or the inter-pole center line of the punching sheet body. For example, any one of the plurality of weight-reducing holes is located on the magnetic pole center line of the punching sheet body. For example, any one of the plurality of weight-reducing holes is located on the inter-pole center line of the punching sheet body. For example, a part of the plurality of weight-reducing holes is located on the magnetic pole center line of the punching sheet body, and another part of the plurality of weight-reducing holes is located on the inter-pole center line of the punching sheet body.

[0053] For a rotor punching sheet, it has a magnetic pole center line and an inter-pole center line. Among them, the connecting line between the center of the magnet slot and the center of the shaft hole forms the magnetic pole center line, abbreviated as the d-axis. The angular bisector of two adjacent magnetic pole center lines is the inter-pole center line. The inter-pole center line is also called the adjacent magnetic pole center line, abbreviated as the q-axis.

[0054] The weight-reducing holes are located on the magnetic pole center line or the inter-pole center line of the punching sheet body. On the premise of ensuring that the performance of the motor is not affected, the setting of the weight-reducing holes can reduce the moment of inertia and reduce the overall weight of the motor.

[0055] It can be understood that for the rotor punching sheet, the number of magnetic pole center lines and the number of inter-pole center lines are both multiple. One weight-reducing hole can be set on one magnetic pole center line, or multiple relatively independent weight-reducing holes can be set on one magnetic pole center line. One weight-reducing hole can be set on one inter-pole center line, or multiple relatively independent weight-reducing holes can be set on one inter-pole center line.

[0056] However, for one weight-reducing hole, it will only be located on one of the magnetic pole center line and the inter-pole center line, and there is no situation where one weight-reducing hole is simultaneously located on the magnetic pole center line and the inter-pole center line.

[0057] The second aspect of the present application proposes a rotor, including: a rotor core, and the rotor core is formed by stacking a plurality of rotor punching sheets as in the first aspect.

[0058] The rotor provided by the present application, because it includes a rotor core formed by stacking the rotor punching sheets as in the first aspect, therefore, has all the beneficial effects of the above-mentioned rotor punching sheet, and will not be elaborated one by one here.

[0059] The third aspect of the present application proposes a motor, including: a rotor as in the second aspect.

[0060] The motor provided by the present application, because it includes a rotor as in the second aspect, therefore, has all the beneficial effects of the above-mentioned rotor, and will not be elaborated one by one here.

[0061] In some embodiments, optionally, the motor further includes: a stator core, the rotor core is rotatably arranged inside the stator core, and the stator core includes: an annular yoke portion, and the minimum value of the distance from the inner peripheral wall to the outer peripheral wall of the annular yoke portion is denoted as Lmin; a plurality of tooth portions, the plurality of tooth portions are arranged at intervals along the circumferential direction of the stator core, and any two adjacent tooth portions and the annular yoke portion enclose a stator slot, the tooth portion includes a tooth body and a tooth boot, the tooth body is connected between the tooth boot and the inner peripheral wall of the annular yoke portion, the tooth boot is arranged opposite to the rotor core, and the width of the tooth body in the circumferential direction of the stator core is denoted as T; wherein, Lmin and T satisfy: 0.35 ≤ Lmin / T ≤ 0.85.

[0062] In this embodiment, the motor further includes a stator core.

[0063] The stator core includes an annular yoke portion and a plurality of tooth portions. The plurality of tooth portions are arranged at intervals along the circumferential direction of the stator core. Each tooth portion includes a tooth body and a tooth shoe, and the tooth body is connected between the tooth shoe and the inner circumferential wall of the annular yoke portion.

[0064] The annular yoke portion is an annular structure with unequal widths. The minimum thickness of the annular yoke portion is denoted as Lmin, that is, the minimum value of the distance from the inner circumferential wall to the outer circumferential wall of the annular yoke portion is denoted as Lmin. The width of the tooth body in the circumferential direction of the stator core is denoted as T.

[0065] Wherein, Lmin and T satisfy 0.35 ≤ Lmin / T ≤ 0.85.

[0066] The plurality of tooth portions cooperate with the annular yoke portion. An unequal yoke thickness is formed between the bottom surface of the stator slot enclosed by two adjacent tooth portions and the outer circumferential surface of the annular yoke portion. The tooth thickness of the motor and the thickness of the annular yoke portion of the motor directly determine the size of the stator slot of the motor. In order to ensure a reasonable slot fill factor and current density of the motor, it is necessary to adjust the thickness of the tooth portion and the annular yoke portion of the motor.

[0067] An excessive tooth body thickness and a too small annular yoke thickness, or a too small tooth body thickness and an excessive annular yoke thickness will both lead to an unreasonable design of the stator size of the motor, resulting in oversaturated and undersaturated regions in the magnetic density design. The oversaturated region of the magnetic density has a large magnetic leakage, wasting materials in the undersaturated region of the magnetic density. At the same time, it causes a low output torque of the motor, a large harmonic content in the motor, a poor back electromotive force waveform, a low efficiency of the motor, insufficient stiffness of the stator of the motor, large vibration and noise, and an increase in the manufacturing cost of the motor. In order to balance the cost of the motor and the electromagnetic performance of the motor, it is necessary to perform a reasonable numerical matching of the thickness of the tooth portion and the annular yoke portion of the motor.

[0068] Therefore, this application sets Lmin and T to satisfy 0.35 ≤ Lmin / T ≤ 0.85, making the numerical matching between the annular yoke portion and the tooth portion more reasonable, balancing the cost of the motor and the electromagnetic performance of the motor, with a uniform magnetic density distribution, small magnetic leakage, a high copper occupancy ratio of the winding, high material utilization rate of the motor. While ensuring that the motor has a reasonable current density, it does not increase the manufacturing cost of the motor, maximizing the output torque and efficiency of the motor, and having good stiffness of the stator, which is beneficial to improving the vibration and noise of the motor.

[0069] In some embodiments, optionally, the end face of the tooth boot opposite to the rotor core includes a second intermediate arc section, a third side arc section, and a fourth side arc section. Along the circumferential direction of the stator core, the second intermediate arc section is located between the third side arc section and the fourth side arc section; the second intermediate arc section protrudes towards the rotor core, and either the third side arc section or the fourth side arc section is recessed towards the outer peripheral wall of the stator core; along the circumferential direction of the stator core, the width of the third side arc section is denoted as M1, the width of the second intermediate arc section is denoted as M2, and the width of the fourth side arc section is denoted as M3, where 1.8 ≤ M1 / M2 ≤ 2.5 and 1.8 ≤ M3 / M2 ≤ 2.5.

[0070] In this embodiment, the structure of the stator core is further defined such that the end face of the tooth boot opposite to the rotor core includes a second intermediate arc section, a third side arc section, and a fourth side arc section. Along the circumferential direction of the stator core, the second intermediate arc section is located between the third side arc section and the fourth side arc section.

[0071] The recessed direction of either the third side arc section or the fourth side arc section is opposite to the protruding direction of the second intermediate arc section.

[0072] Along the circumferential direction of the stator core, the width of the third side arc section is denoted as M1, the width of the second intermediate arc section is denoted as M2, and the width of the fourth side arc section is denoted as M3.

[0073] M1, M2, and M3 satisfy 1.8 ≤ M1 / M2 ≤ 2.5 and 1.8 ≤ M3 / M2 ≤ 2.5.

[0074] Specifically, the air-gap synthetic magnetic field in the motor includes a fundamental wave and harmonics, and the larger the fundamental wave, the smaller the harmonics. The content and proportion of the fundamental wave and harmonics in the air-gap magnetic field directly determine the torque output ability and NVH (Noise, Vibration, Harshness) performance of the motor. And the larger the fundamental wave, the smaller the harmonics.

[0075] On the other hand, the torque ripple of the motor also depends to a large extent on the non-sinusoidality of the air-gap magnetic field. The higher the harmonic content in the air-gap magnetic field, the worse the output torque waveform of the motor, which not only affects the running stability of the motor but also causes axial torsional vibration and crosstalk of the motor, further exacerbating the vibration and noise of the motor. The closer it is to non-sinusoidality, the greater the ripple and the greater the NVH.

[0076] By setting the structure of the tooth boot, the end face of the tooth boot facing the rotor core includes a second intermediate arc section, a third side arc section, and a fourth side arc section. An unequal air gap that varies periodically along the circumference can be formed between the outer circumference of the rotor and the inner circumference of the stator. It should be noted that the number of any one of the second intermediate arc section, the third side arc section, and the fourth side arc section is equal to the number of teeth of the motor.

[0077] By defining the relationship between the width of the second intermediate arc segment and the widths of the third side arc segment and the fourth side arc segment to satisfy 1.8 ≤ M1 / M2 ≤ 2.5 and 1.8 ≤ M3 / M2 ≤ 2.5. That is, the ratio of the width of the third side arc segment to the width of the second intermediate arc segment satisfies 1.8 to 2.5, and the ratio of the width of the fourth side arc segment to the width of the second intermediate arc segment satisfies 1.8 to 2.5.

[0078] It can be understood that along the circumferential direction of the stator core, the width of the tooth tip facing the end face of the rotor core is equal to the sum of the widths of the second intermediate arc segment, the third side arc segment, and the fourth side arc segment. This can make the air gap transition of the motor more reasonable, reduce the harmonics caused by saturated slotting at the tooth tip position, and can greatly reduce the air gap harmonic content of the motor on the basis of ensuring the unchanged output torque of the motor, effectively weaken the torque ripple and back electromotive force waveform of the motor, significantly reduce the amplitude of the radial electromagnetic force of the motor, thereby improving the vibration and noise of the motor, enhancing the performance of the motor, and this structural setting has the characteristics of simple structure and easy processing, and the production cost of the product is low.

[0079] In some embodiments, optionally, the motor further includes: a plurality of permanent magnets, and at least one permanent magnet is disposed in any one of the plurality of magnet slots; the number of permanent magnets is denoted as n, and the number of magnet slots is denoted as m, where m = k × p, k is a non-zero integer, and n ≥ m.

[0080] In this embodiment, the structure of the motor is further defined such that the motor further includes a plurality of permanent magnets, and the relationship between the number m of magnet slots, the number n of permanent magnets, and the number of pole pairs P of the motor satisfies m = k × p, k is a non-zero integer, and n ≥ m.

[0081] Specifically, if the magnet slots are in a straight line shape and there is only one magnet slot per pole, then the number of magnet slots is m = p. And the number of permanent magnets placed in each magnet slot can be 1, 2, or more. When n ≥ m and the number of permanent magnets in each magnet slot is greater than or equal to 2, it helps to reduce the eddy current loss of the permanent magnets and improve the output torque and efficiency of the motor. At the same time, reducing the eddy current loss of the permanent magnets can improve the temperature rise of the permanent magnets, thereby reducing the grade of the permanent magnets and the cost of the motor.

[0082] However, too many segmentation numbers will not only increase the processing and manufacturing difficulty and cost, but also increase the end leakage magnetic flux of the motor, resulting in a decrease in the utilization rate of the permanent magnets.

[0083] Specifically, if the magnet slots are in a V shape and there are two magnet slots per pole, then the number of magnet slots is m = 2 × p, and the specific number of permanent magnet slots will not be elaborated here.

[0084] In some embodiments, optionally, along the axial direction of the rotor, a plurality of rotor laminations are divided into at least one iron core group, the iron core group includes a plurality of iron core segments, and the iron core segment includes at least one rotor lamination; any two adjacent iron core segments in the iron core group are arranged in a circumferentially misaligned manner on the rotor, and the misalignment angle is denoted as θ. The total number of iron core segments of a plurality of iron core groups is denoted as n, n≥2, and the number of stator slots is denoted as Z; θ = θ0 + Δθ, θ0 = 360° / (n×Nc), Nc = LCM(Z, 2×p), 0°≤Δθ≤θ0.

[0085] In this embodiment, along the axial direction of the rotor iron core, the rotor iron core includes at least one iron core group, the iron core group includes a plurality of iron core segments, and any two adjacent iron core segments in the iron core group are arranged in a circumferentially misaligned manner on the rotor iron core. That is, the rotor iron core is assembled in a segmented skewed pole manner, that is, at least two adjacent iron core segments are arranged in a circumferentially misaligned manner on the rotor iron core. The misalignment angle is θ, θ = θ0 + Δθ, θ0 = 360° / (n×Nc), where n is the total number of iron core segments of a plurality of iron core groups, and n is a natural number greater than or equal to 2. Nc = LCM(Z, 2×p), Z is the number of stator slots, p is the number of pole pairs of the motor, and 0°≤Δθ≤θ0. Since the permanent magnets in the motor do not change the magnetic strength according to the position and state of the motor, during the circumferential rotation process, the magnetic poles of the permanent magnets will generate different attractive forces on the stator slots and teeth of the stator. The different attractive forces will cause torque fluctuations when the rotor rotates, and this fluctuation will cause vibration and noise during the operation of the motor.

[0086] Especially for high-power motors such as automotive permanent magnet synchronous motors, the vibration and noise caused by this reason are more obvious.

[0087] However, the optimization combination effect of the structural parameters in the motor has a limited effect on improving the air gap magnetic field waveform. Especially the tooth harmonics, which are the main sources of vibration and noise in the motor. Therefore, it is also necessary to combine the segmented skewed pole of the rotor to further weaken the harmonic content. The segmented misaligned pole of the rotor can reduce the cogging torque and torque ripple, thereby reducing the electromagnetic vibration. In other words, by dividing the rotor iron core into multiple iron core groups and making there be a relative rotation angle between different iron core segments in the iron core group, the specific harmonic content in the motor can be effectively suppressed, the torque ripple and cogging torque of the motor can be improved, and thus the vibration and noise of the motor can be reduced.

[0088] The segmented skewed pole can, while ensuring the electromagnetic torque of the motor, maximize the reduction of the end leakage magnetic flux of the permanent magnets, improve the utilization rate of the permanent magnets, weaken the cogging torque, and reduce the torque ripple of the motor. At the same time, it can improve the air gap magnetic field distribution, reduce the distortion rate of the air gap magnetic field, and improve the noise and vibration performance of the motor.

[0089] A fourth aspect of the present application provides a power system, comprising: a motor as in the third aspect.

[0090] Since the power system provided by the present application includes a motor as in the third aspect, it has all the beneficial effects of the above-mentioned motor, which will not be elaborated one by one herein.

[0091] Optionally, the power system includes a motor, a controller, and a reducer. The controller is electrically connected to the motor and the reducer, and the controller controls the operation of the motor and the reducer. The power system can meet the torque and power requirements for the vehicle to move forward.

[0092] A fifth aspect of the present application provides a vehicle, comprising: a motor as in the third aspect; or a power system as in the fourth aspect.

[0093] Since the vehicle provided by the present application includes a motor as in the third aspect or a power system as in the fourth aspect, it has all the beneficial effects of the above-mentioned motor or power system, which will not be elaborated one by one herein.

[0094] It should be noted that the vehicle can be a new energy vehicle. New energy vehicles include battery electric vehicles, range-extended electric vehicles, hybrid electric vehicles, fuel cell electric vehicles, hydrogen engine vehicles, etc.

[0095] The additional aspects and advantages of the present application will become apparent in the following description section, or can be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0096] The above and / or additional aspects and advantages of the present application will become apparent and be readily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0097] Figure 1 FIG. 1 shows a schematic diagram of the first part of the structure of the motor according to an embodiment of the present application;

[0098] Figure 2 FIG. 2 shows a schematic diagram of the first part of the structure of the rotor according to the first embodiment of the present application;

[0099] Figure 3 FIG. 3 shows a schematic diagram of the second part of the structure of the rotor according to the first embodiment of the present application;

[0100] Figure 4 FIG. 4 shows a schematic diagram of the structure of the stator core according to an embodiment of the present application;

[0101] Figure 5 FIG. 5 shows a schematic diagram of a part of the structure of the stator core according to an embodiment of the present application;

[0102] Figure 6Shows a partial structural schematic diagram of the rotor of the second embodiment of the present application;

[0103] Figure 7 Shows a partial structural schematic diagram of the rotor of the third embodiment of the present application;

[0104] Figure 8 Shows a partial structural schematic diagram of the rotor of the fourth embodiment of the present application;

[0105] Figure 9 Shows a partial structural schematic diagram of the rotor of the fifth embodiment of the present application;

[0106] Figure 10 Shows a structural schematic diagram of the rotor punching sheet of an embodiment of the present application;

[0107] Figure 11 Shows a first partial structural decomposition diagram of the rotor of an embodiment of the present application;

[0108] Figure 12 Shows a decomposition diagram of the first perspective of the second part structure of the rotor of an embodiment of the present application;

[0109] Figure 13 Shows a schematic diagram of the second part structure of the motor of an embodiment of the present application;

[0110] Figure 14 Shows a decomposition diagram of the second perspective of the second part structure of the rotor of an embodiment of the present application;

[0111] Figure 15 Shows a data curve graph of the peak-to-peak value of the cogging torque and the 24th-order radial electromagnetic force density varying with the change of R1 / R2 in the present application;

[0112] Figure 16 Shows a data curve graph of the output torque and torque ripple varying with the change of w×p / (π×R1) in the present application;

[0113] Figure 17 Shows a comparison schematic diagram of the copper ratio, peak torque and efficiency between the related art and the present application;

[0114] Figure 18 Shows a data curve graph of the air-gap magnetic field harmonic distortion rate and iron loss varying with the change of a×p / 360 in the present application.

[0115] Wherein, Figures 1 to 14 The corresponding relationship between the reference signs in the

[0116] 10 Rotor punching sheet, 100 Punching sheet body, 110 Shaft hole, 112 Center of the shaft hole, 120 Magnet slot, 122 Sub-slot, 130 First intermediate arc segment, 140 First side arc segment, 150 Second side arc segment, 160 Permanent magnet segment, 170 Magnetic isolation segment, 180 First magnetic isolation bridge, 190 Second magnetic isolation bridge, 200 Weight reduction hole, 30 Rotor, 300 Rotor core, 310 Core group, 312 Core segment, 40 Motor, 400 Stator core, 410 Ring-shaped yoke, 420 Tooth part, 422 Tooth body, 424 Tooth shoe, 4242 Second intermediate arc segment, 4244 Third side arc segment, 4246 Fourth side arc segment, 430 Stator slot, 500 Permanent magnet, 600 Air gap, 700 Winding, 800 First radially extending line, 900 Second radially extending line. Detailed implementation manners

[0117] In order to more clearly understand the above objects, features and advantages of the present application, the present application will be further described in detail below with reference to the drawings and specific implementation manners. It should be noted that, without conflict, the embodiments of the present application and the features in the embodiments can be combined with each other.

[0118] In the following description, many specific details are set forth in order to fully understand the present application. However, the present application may also be implemented in other ways different from those described herein. Therefore, the protection scope of the present application is not limited by the specific embodiments disclosed below.

[0119] The following refers to Figures 1 to 18 A rotor punching sheet 10, a rotor 30, a motor 40, a power system and a vehicle according to some embodiments of the present application.

[0120] As Figure 1 , Figure 2 , Figure 3 , Figure 6 , Figure 7 and Figure 8 shown, a rotor punching sheet 10 according to some embodiments of the present application includes a punching sheet body 100.

[0121] The punching sheet body 100 is provided with a shaft hole 110 and a plurality of magnet slots 120.

[0122] The plurality of magnet slots 120 are arranged at intervals around the shaft hole 110.

[0123] The part of the outer peripheral wall of the punching sheet body 100 opposite to the magnet slot 120 includes a first intermediate arc segment 130, a first side arc segment 140 and a second side arc segment 150.

[0124] The first intermediate arc segment 130 is located between the first side arc segment 140 and the second side arc segment 150.

[0125] The magnet slot 120 includes a permanent magnet segment 160 and a magnetic isolation segment 170.

[0126] The permanent magnet segment 160 communicates with the magnetic isolation segment 170.

[0127] The magnet slot 120 has a first end and a second end in the circumferential direction of the rotor punching sheet 10.

[0128] The radius corresponding to the first intermediate arc segment 130 is denoted as R1.

[0129] The width of the permanent magnet segment 160 in the direction from the first end to the second end is denoted as w.

[0130] The number of pole pairs of the motor 40 is denoted as p.

[0131] Wherein, 0.32×π×R1 / p ≤ w ≤ 0.75×π×R1 / p.

[0132] A rotor punching sheet 10 provided by the present application includes a punching sheet body 100. The punching sheet body 100 is provided with a shaft hole 110 and a plurality of magnet slots 120. The plurality of magnet slots 120 are arranged at intervals around the shaft hole 110.

[0133] The part of the outer peripheral wall of the punching sheet body 100 opposite to the magnet slot 120 includes a first intermediate arc segment 130, a first side arc segment 140 and a second side arc segment 150. Among them, the first intermediate arc segment 130 is located between the first side arc segment 140 and the second side arc segment 150.

[0134] The middle part of the punching sheet body 100 is provided with a shaft hole 110. The shaft hole 110 is used to accommodate the rotating shaft of the motor 40. A plurality of magnet slots 120 are arranged at intervals around the shaft hole 110 on the punching sheet body 100. Each magnet slot 120 penetrates along the axial direction of the rotor punching sheet 10. The magnet slot 120 is used to accommodate the permanent magnet 500 of the motor 40.

[0135] Any one of the plurality of magnet slots 120 includes a permanent magnet segment 160 and a magnetic isolation segment 170. That is, each magnet slot 120 includes a permanent magnet segment 160 and a magnetic isolation segment 170. The permanent magnet segment 160 and the magnetic isolation segment 170 communicate with each other. The permanent magnet segment 160 is used to accommodate the permanent magnet 500 of the rotor 30. The permanent magnet 500 is embedded in the permanent magnet segment 160. No permanent magnet 500 is provided in the magnetic isolation segment 170. That is, the magnetic isolation segment 170 is empty.

[0136] Among them, the width of the permanent magnet 500 located in the permanent magnet segment 160 is associated with the number of pole pairs of the motor 40 and the maximum radius of the motor 40 (that is, the radius corresponding to the first intermediate arc segment 130). Thus, the width of the permanent magnet 500 can be set within a reasonable range, avoiding problems such as insufficient output performance of the motor 40, large content of the third harmonic of the magnetic potential waveform, and large end leakage of the permanent magnet 500 due to too small width of the permanent magnet 500.

[0137] The radius corresponding to the first intermediate arc segment 130 is denoted as R1, the width of the permanent magnet segment 160 in the direction from the first end to the second end is denoted as w, and the number of pole pairs of the motor 40 is denoted as p. By defining the relationship among R1, w, and p to satisfy 0.32×π×R1 / p ≤ w ≤ 0.75×π×R1 / p, not only the utilization rate of the permanent magnet 500 is increased, the quality of the output torque of the motor 40 is improved, and the torque ripple is suppressed, but also high power density and high efficiency can be achieved, which is beneficial to reducing the production cost of the product.

[0138] Optionally, the first intermediate arc segment 130 includes a first intermediate circular arc segment, the first side arc segment 140 includes a first side arc segment 140 segment, and the second side arc segment 150 includes a second side arc segment 150 segment.

[0139] It can be understood that the motor 40 includes a stator core 400, a rotor core 300, a plurality of permanent magnets 500, and a rotating shaft. The stator core 400 and the rotor core 300 are coaxially arranged, the stator core 400 is arranged outside the rotor core 300, and an air gap 600 is left between the stator core 400 and the rotor core 300. The size of the air gap 600 can be selected according to the process level and the deformation amount of the rotor core 300. Optionally, along the direction from the rotor core 300 to the stator core 400, the value of the air gap 600 is greater than or equal to 0.5 mm.

[0140] The stator includes a stator core 400 and a winding 700, and the rotor 30 includes a rotor core 300 and a permanent magnet 500. The winding 700 is arranged inside the stator core 400, and the permanent magnet 500 is arranged inside the rotor core 300. The rotor core 300 is formed by stacking a plurality of rotor punching sheets 10. When the motor 40 operates in the motor mode, it can convert electrical energy into mechanical energy. The specific principle is as follows: The controller converts the direct current of the battery into the three-phase alternating current required by the motor 40. After the three-phase alternating current is introduced into the winding 700 of the stator, a tangential magnetic field pulling force will be generated between the stator and the rotor 30, causing the rotor 30 to rotate, thereby generating a mechanical torque to drive the electric vehicle to move forward.

[0141] It is commonly used in the P3 motor under the hybrid system or the main drive motor in the pure electric drive system. When the motor 40 operates in the generator 40 mode, the rotor 30 of the motor 40 is connected to the engine through a rotating shaft or a belt. The rotation of the engine drives the rotor 30 to rotate. The winding 700 of the stator will generate an induced current in the alternating stator magnetic field, thereby converting the mechanical energy of the engine into electrical energy. The electrical energy is fed back to the battery or used to drive the motor, and is commonly used in the hybrid P1 motor or the range extender system.

[0142] In some embodiments, optionally, as Figure 1 and Figure 3 shown, the radius corresponding to the first side arc segment 140 is denoted as R2.

[0143] Among them, 2 ≤ R1 / R2 ≤ 5.5.

[0144] In this embodiment, the rotor punching sheet 10 provided by the present application includes a punching sheet body 100 and a plurality of magnet slots 120. The outer peripheral wall of the punching sheet body 100 includes a first intermediate arc segment 130, a first side arc segment 140, and a second side arc segment 150. The radius corresponding to the first intermediate arc segment 130 is denoted as R1, and the radius corresponding to the first side arc segment 140 is denoted as R2.

[0145] The radius R1 corresponding to the first intermediate arc segment 130 and the radius R2 corresponding to the first side arc segment 140 satisfy: 2 ≤ R1 / R2 ≤ 5.5. The outer peripheral wall of the punching sheet body 100 includes an outer peripheral segment on the axial end face, and the outer peripheral segment is a closed line segment.

[0146] The outer peripheral wall of the punching sheet body 100 includes a plurality of arc segment groups connected in sequence, and one arc segment group corresponds to one magnet slot 120. It is worth noting that the number of arc segment groups and the number of magnet slots 120 are both equal to the number of pole pairs p of the motor 40.

[0147] It can be understood that the outer peripheral segment includes a plurality of connected arc segment groups, and one arc segment group corresponds to one magnet slot 120. It is worth noting that the number of arc segment groups and the number of magnet slots 120 are both equal to the number of magnetic poles p of the motor 40.

[0148] By making each arc segment group include at least the first intermediate arc segment 130, the first side arc segment 140, and the second side arc segment 150, for the motor 40, an unequal air gap 600 that changes periodically in the circumferential direction can be formed between the outer peripheral wall of the rotor 30 and the inner peripheral wall of the stator, so as to form an alternation between the first side arc segment 140, the first intermediate arc segment 130, and the second side arc segment 150 on the outer peripheral wall of the rotor punching sheet 10, which can make the operation of the motor 40 more stable. At the same time, the magnetic field distribution of the rotor 30 is optimized, and the armature reaction of the direct and quadrature axes is effectively weakened. On the basis of ensuring the unchanged peak torque of the motor 40, the torque ripple of the motor 40 is significantly improved, the running vibration noise of the motor 40 is reduced, and the user's comfort is improved.

[0149] At the same time, the iron losses of the stator and rotor 30 of the motor 40 are also reduced to a certain extent, which is beneficial to improving the efficiency of the motor 40.

[0150] Meanwhile, by reasonably setting the relationship between the radius R1 corresponding to the first intermediate arc segment 130 and the radius R2 corresponding to the first side arc segment 140 in this application, such that 2 ≤ R1 / R2 ≤ 5.5, in this way, not only the advantages of the integral circle design and the pure eccentric design of the rotor punching sheet 10 are taken into account, but also on the basis of not changing the length of the average air gap 600 of the motor 40 and ensuring that the peak torque of the motor 40 remains unchanged, the air gap 600 magnetic field can be effectively improved, the air gap 600 magnetic density and the sinusoidality of the back electromotive force waveform can be increased, the harmonic ratio can be reduced, and thus it is beneficial to reduce the torque ripple, and the vibration and noise of the motor 40 are significantly reduced.

[0151] Optionally, as Figure 3 shown, the radius corresponding to the first side arc segment 140 is denoted as R3. Among them, 2 ≤ R1 / R3 ≤ 5.5. This setting is equivalent to the matching relationship between R1 and R2, which will not be elaborated here.

[0152] In some embodiments, optionally, as Figure 2 and Figure 3 shown, either the first side arc segment 140 or the second side arc segment 150 is connected to the first intermediate arc segment 130.

[0153] The center of the circle corresponding to the first intermediate arc segment 130 coincides with the center 112 of the shaft hole.

[0154] The center of the circle corresponding to either the first side arc segment 140 or the second side arc segment 150 is arranged separately from the center 112 of the shaft hole.

[0155] The center of the circle corresponding to the first side arc segment 140 and the center of the circle corresponding to the second side arc segment 150 are located on the same circumference.

[0156] Either the first side arc segment 140 or the second side arc segment 150 is symmetrically arranged with respect to the magnetic pole center line.

[0157] In this embodiment, the matching structure of the first side arc segment 140, the second side arc segment 150 and the first intermediate arc segment 130 is further defined.

[0158] On the rotor punching sheet 10, the first intermediate arc segment 130 is respectively connected to the first side arc segment 140 and the second side arc segment 150. The center of the circle corresponding to either the first side arc segment 140 or the second side arc segment 150 is arranged separately from the center 112 of the shaft hole. The center of the circle corresponding to the first side arc segment 140 and the center of the circle corresponding to the second side arc segment 150 are located on the same circumference.

[0159] Thus, a three-segment combined arc can be formed on the outer peripheral wall of the rotor punching sheet 10, and the distance from the center 112 of the shaft hole of the rotor punching sheet 10 to different parts of the outer peripheral wall of the rotor punching sheet 10 is different, so that an unequal air gap 600 can be formed between the rotor 30 and the stator.

[0160] Either the first side arc segment 140 or the second side arc segment 150 is symmetrically arranged with respect to the magnetic pole center line. That is, the first side arc segment 140 is symmetrically arranged with respect to the magnetic pole center line, and the second side arc segment 150 is symmetrically arranged with respect to the magnetic pole center line. It can be understood that the magnetic pole center line coincides with a radial line on the rotor punching 10.

[0161] Either the first side arc segment 140 or the second side arc segment 150 being symmetrically arranged with respect to the magnetic pole center line can prevent even harmonics that exacerbate the NVH (Noise, Vibration, Harshness) of the motor 40. At the same time, it makes each magnetic pole a symmetric structure, which is conducive to quality control during the production process.

[0162] In some embodiments, optionally, as Figure 3 shown, the number of magnetic isolation segments 170 is two.

[0163] The permanent magnet segment 160 is connected between the two magnetic isolation segments 170.

[0164] In the magnet slot 120, the connection points of the permanent magnet segment 160 and the two magnetic isolation segments 170 facing away from the shaft hole 110 are respectively denoted as the first vertex and the second vertex.

[0165] The first radial extension line 800 passing through the center 112 of the shaft hole intersects or is tangent to the first vertex.

[0166] The second radial extension line 900 passing through the center 112 of the shaft hole intersects or is tangent to the second vertex.

[0167] The included angle formed by the first radial extension line 800 and the second radial extension line 900 is denoted as a.

[0168] Among them, a and p satisfy: 0.63×360 / p ≤ a ≤ 0.87×360 / p.

[0169] In this embodiment, the number of magnetic isolation segments 170 is two, the permanent magnet segment 160 is located between the two magnetic isolation segments 170, any one of the two magnetic isolation segments 170 is connected to the permanent magnet segment 160, and any one of the two magnetic isolation segments 170 is in communication with the permanent magnet segment 160.

[0170] In the motor 40 (such as, a permanent magnet synchronous motor), the synthesized magnetic field in the air gap 600 of the motor 40 includes a fundamental wave magnetic field and a harmonic magnetic field, and the content and proportion of the fundamental wave magnetic field and the harmonic magnetic field in the synthesized magnetic field of the air gap 600 directly determine the torque output ability and noise reduction performance of the motor 40.

[0171] Moreover, the larger the fundamental magnetic field is, the smaller the harmonic magnetic field is, the higher the torque output is, and the better the noise reduction performance of the motor 40 is. Conversely, the smaller the output torque is, the worse the noise reduction performance is.

[0172] The connection points of the permanent magnet segments 160 and the two magnetic isolation segments 170 facing away from the shaft hole 110 are respectively denoted as the first vertex A1 and the second vertex A2. The first radial extension line 800 passes through the center 112 of the shaft hole, and the first radial extension line 800 intersects or is tangent to the first vertex A1. The second radial extension line 900 passes through the center 112 of the shaft hole, and the second radial extension line 900 intersects or is tangent to the second vertex A2. The included angle a is formed by the first radial extension line 800 and the second radial extension line 900.

[0173] The magnitudes of the fundamental magnetic field and the harmonic magnetic field in the air gap 600 magnetic field are directly related to the pole arc angle (i.e., the included angle a) in the rotor 30, and the value range of the included angle a is associated with the number of pole pairs of the rotor 30, that is, the number of groups of the permanent magnets 500. Since the number of pole pairs of different motors 40 may be different, the angle of the pole arc angle will also change. Simply limiting the angle range of the pole arc angle is likely to deviate from the structural changes of the rotor 30. That is, the value range of the pole arc angle is related to the number of pole pairs, which can further improve the accuracy of determining the value range of the pole arc angle.

[0174] a and p satisfy 0.63×360 / p ≤ a ≤ 0.87×360 / p, which can optimize the waveform of the synthesized magnetic field in the air gap 600, effectively reduce the content of the harmonic magnetic field in the air gap 600 magnetic field, make the air gap 600 magnetic field waveform approach a sine waveform, thereby reducing the cogging torque and torque ripple of the permanent magnet synchronous motor, and reducing the vibration noise of the motor 40. Moreover, when the content of the harmonic magnetic field is reduced, the iron loss generated by the high-frequency harmonic magnetic field can be reduced, the iron loss of the motor 40 in the high-speed range can be reduced, the output torque and efficiency of the motor 40 can be improved, which is beneficial to improving the service performance of the motor 40.

[0175] Optionally, a = 0.65×360 / p, a = 0.68×360 / p, a = 0.7×360 / p, a = 0.73×360 / p, a = 0.75×360 / p, a = 0.8×360 / p, a = 0.82×360 / p, and a = 0.85×360 / p, etc., which are not listed one by one here.

[0176] In some embodiments, optionally, as Figure 6 and Figure 10 shown, the part of the punching sheet body 100 between the magnet slot 120 and the outer peripheral wall of the punching sheet body 100 is the first magnetic isolation bridge 180.

[0177] The width of the first magnetic isolation bridge 180 in the direction from the magnet slot 120 to the outer peripheral wall of the punching sheet body 100 is denoted as d1.

[0178] The thickness of the punching sheet body 100 is denoted as d2.

[0179] Wherein, d1 ≥ 2 × d2.

[0180] In this embodiment, the structure of the punching sheet body 100 is further defined such that the portion of the punching sheet body 100 between the magnet groove 120 and the outer peripheral wall of the punching sheet body 100 is the first magnetic isolation bridge 180. Along the direction from the magnet groove 120 to the outer peripheral wall of the punching sheet body 100, the width of the first magnetic isolation bridge 180 is denoted as d1. The thickness of the punching sheet body 100 is denoted as d2, wherein, d1 ≥ 2 × d2.

[0181] Specifically, any one of the plurality of magnet grooves 120 includes a permanent magnet segment 160 and a magnetic isolation segment 170. The permanent magnet segment 160 and the magnetic isolation segment 170 communicate with each other. The permanent magnet segment 160 is used to accommodate the permanent magnet 500 of the rotor 30. The permanent magnet 500 is embedded in the permanent magnet segment 160. There is no permanent magnet 500 in the magnetic isolation segment 170, that is, the magnetic isolation segment 170 is empty.

[0182] The magnetic isolation segment 170 communicates with both sides of the permanent magnet segment 160. Wherein, the portion of the punching sheet body 100 between the magnet groove 120 and the outer peripheral wall of the punching sheet body 100 is the first magnetic isolation bridge 180. The width of the first magnetic isolation bridge 180 is associated with the electromagnetic performance and strength performance of the motor 40. Setting the width of the first magnetic isolation bridge 180 within the above range can avoid the excessive difficulty in the production and preparation process due to the too small width of the first magnetic isolation bridge 180 and reduce the possibility of deformation of the rotor punching sheet 10 during the operation of the motor 40. It can significantly suppress the magnetic leakage phenomenon of the permanent magnet magnetic field of the rotor 30 passing through the first magnetic isolation bridge 180, reduce the magnetic leakage magnetic density at the first magnetic isolation bridge 180, and increase the utilization rate of the permanent magnet 500. Thus, on the basis of improving the performance of the motor 40, the quality of the output torque of the motor 40 can be improved, the torque ripple can be suppressed, and high power density and high efficiency can be achieved.

[0183] In some embodiments, optionally, as Figure 9 shown, the magnet groove 120 includes a plurality of sub-grooves 122.

[0184] The plurality of sub-grooves 122 are arranged at intervals along the circumferential direction of the rotor punching sheet 10.

[0185] Any one of the plurality of sub-grooves 122 includes a permanent magnet segment 160 and two magnetic isolation segments 170.

[0186] The permanent magnet segment 160 is connected between the two magnetic isolation segments 170.

[0187] In the magnet groove 120, the portion of the punching sheet body 100 between two adjacent sub-grooves 122 is the second magnetic isolation bridge 190.

[0188] The length of the second magnetic isolation bridge 190 in the circumferential direction of the rotor punching sheet 10 is denoted as d3.

[0189] The thickness of the punching sheet body 100 is denoted as d2.

[0190] Wherein, d3≥2×d2.

[0191] In this embodiment, the structure of the punching sheet body 100 is further defined such that the magnet slot 120 includes a plurality of sub-slots 122, and the plurality of sub-slots 122 are arranged at intervals in the circumferential direction of the rotor punching sheet 10. Any one of the plurality of sub-slots 122 includes a permanent magnet segment 160 and two magnetic isolation segments 170, that is, each sub-slot 122 includes a permanent magnet segment 160 and two magnetic isolation segments 170.

[0192] The permanent magnet segment 160 is connected between the two magnetic isolation segments 170.

[0193] In the magnet slot 120, the part of the punching sheet body 100 located between two adjacent sub-slots 122 is the second magnetic isolation bridge 190. Along the circumferential direction of the rotor punching sheet 10, the length of the second magnetic isolation bridge 190 is denoted as d3. The thickness of the punching sheet body 100 is denoted as d2, wherein, d3≥2×d2.

[0194] Specifically, any one of the plurality of magnet slots 120 includes a permanent magnet segment 160 and a magnetic isolation segment 170. The permanent magnet segment 160 and the magnetic isolation segment 170 are communicated with each other. The permanent magnet segment 160 is used to accommodate the permanent magnet 500 of the rotor 30, and the permanent magnet 500 is embedded in the permanent magnet segment 160. No permanent magnet 500 is provided in the magnetic isolation segment 170, that is, the magnetic isolation segment 170 is empty.

[0195] The magnetic isolation segment 170 is communicated on both sides of the permanent magnet segment 160. Wherein, the part of the punching sheet body 100 located between two adjacent sub-slots 122 is the second magnetic isolation bridge 190. The length of the second magnetic isolation bridge 190 is associated with the electromagnetic performance and strength performance of the motor 40. Setting the length of the second magnetic isolation bridge 190 within the above range can avoid the excessive difficulty in the production and preparation process due to the too small length of the second magnetic isolation bridge 190 and reduce the possibility of deformation of the rotor punching sheet 10 during the operation of the motor 40. It can significantly suppress the magnetic leakage phenomenon of the permanent magnetic field of the rotor 30 passing through the second magnetic isolation bridge 190, reduce the magnetic leakage magnetic density at the second magnetic isolation bridge 190, and increase the utilization rate of the permanent magnet 500. Thus, on the basis of improving the performance of the motor 40, the quality of the output torque of the motor 40 can be improved, the torque ripple can be suppressed, and high power density and high efficiency can be achieved.

[0196] In some embodiments, optionally, such as Figure 1 、 Figure 2 、 Figure 6 、 Figure 7 andFigure 8 As shown, the punching sheet body 100 is provided with a plurality of weight-reducing holes 200. The plurality of weight-reducing holes 200 are arranged at intervals, and the weight-reducing holes 200 are located on the magnetic pole center line or the inter-pole center line of the punching sheet body 100.

[0197] In this embodiment, the structure of the punching sheet body 100 is further defined such that the punching sheet body 100 is provided with a plurality of weight-reducing holes 200. The plurality of weight-reducing holes 200 are arranged at intervals, and the weight-reducing holes 200 are located on the magnetic pole center line or the inter-pole center line of the punching sheet body 100. For example, any one of the plurality of weight-reducing holes 200 is located on the magnetic pole center line of the punching sheet body 100. For example, any one of the plurality of weight-reducing holes 200 is located on the inter-pole center line of the punching sheet body 100. For example, a part of the plurality of weight-reducing holes 200 is located on the magnetic pole center line of the punching sheet body 100, and another part of the plurality of weight-reducing holes 200 is located on the inter-pole center line of the punching sheet body 100.

[0198] For a rotor punching sheet 10, it has a magnetic pole center line and an inter-pole center line. Among them, the line connecting the center of the magnet slot 120 and the center 112 of the shaft hole forms the magnetic pole center line, which is abbreviated as the d-axis. The angular bisector of two adjacent magnetic pole center lines is the inter-pole center line. The inter-pole center line is also called the adjacent magnetic pole center line, which is abbreviated as the q-axis.

[0199] The weight-reducing holes 200 are located on the magnetic pole center line or the inter-pole center line of the punching sheet body 100. On the premise of ensuring that the performance of the motor 40 is not affected, the setting of the weight-reducing holes 200 can reduce the moment of inertia and reduce the overall weight of the motor 40.

[0200] It can be understood that for the rotor punching sheet 10, the number of magnetic pole center lines and the number of inter-pole center lines are both multiple. One weight-reducing hole 200 can be set on one magnetic pole center line, or multiple relatively independent weight-reducing holes 200 can be set on one magnetic pole center line. One weight-reducing hole 200 can be set on one inter-pole center line, or multiple relatively independent weight-reducing holes 200 can be set on one inter-pole center line.

[0201] However, for one weight-reducing hole 200, it will only be located on one of the magnetic pole center line and the inter-pole center line, and there is no situation where one weight-reducing hole 200 is simultaneously located on the magnetic pole center line and the inter-pole center line.

[0202] According to another rotor 30 of some embodiments of the present application, it includes: a rotor core 300, and the rotor core 300 is formed by stacking a plurality of rotor punching sheets 10 as in any of the above embodiments.

[0203] The rotor 30 provided by this application includes a rotor core 300 formed by stacking rotor laminations 10 as in the first aspect. Therefore, it has all the beneficial effects of the above rotor lamination 10, which will not be elaborated one by one here.

[0204] As Figure 1 and Figure 13 shown, a motor 40 according to some other embodiments of this application includes: a rotor 30 as in the above embodiments.

[0205] The motor 40 provided by this application includes a rotor 30 as in the above embodiments. Therefore, it has all the beneficial effects of the above rotor 30, which will not be elaborated one by one here.

[0206] In some embodiments, optionally, as Figure 1 , Figure 4 and Figure 5 shown, the motor 40 further includes a stator core 400.

[0207] The rotor core 300 is rotatably disposed within the stator core 400.

[0208] The stator core 400 includes an annular yoke portion 410 and a plurality of tooth portions 420.

[0209] The minimum value of the distance from the inner peripheral wall to the outer peripheral wall of the annular yoke portion 410 is denoted as Lmin.

[0210] The plurality of tooth portions 420 are arranged at intervals along the circumferential direction of the stator core 400.

[0211] Any two adjacent tooth portions 420 and the annular yoke portion 410 enclose a stator slot 430.

[0212] The tooth portion 420 includes a tooth body 422 and a tooth tip 424.

[0213] The tooth body 422 is connected between the tooth tip 424 and the inner peripheral wall of the annular yoke portion 410.

[0214] The tooth tip 424 is disposed opposite to the rotor core 300.

[0215] The width of the tooth body 422 in the circumferential direction of the stator core 400 is denoted as T.

[0216] Wherein, Lmin and T satisfy: 0.35 ≤ Lmin / T ≤ 0.85.

[0217] In this embodiment, the motor 40 further includes a stator core 400.

[0218] The stator core 400 includes an annular yoke portion 410 and a plurality of tooth portions 420. The plurality of tooth portions 420 are arranged at intervals in the circumferential direction of the stator core 400. The tooth portion 420 includes a tooth body 422 and a tooth boot 424. The tooth body 422 is connected between the tooth boot 424 and the inner peripheral wall of the annular yoke portion 410.

[0219] The annular yoke portion 410 is an annular structure with unequal widths. The minimum thickness of the annular yoke portion 410 is denoted as Lmin. That is, the minimum value of the distance from the inner peripheral wall to the outer peripheral wall of the annular yoke portion 410 is denoted as Lmin. The width of the tooth body 422 in the circumferential direction of the stator core 400 is denoted as T.

[0220] Wherein, Lmin and T satisfy 0.35 ≤ Lmin / T ≤ 0.85.

[0221] The plurality of tooth portions 420 cooperate with the annular yoke portion 410. An adjacent two tooth portions 420 and the annular yoke portion 410 enclose a stator slot 430. An unequal yoke thickness is formed between the bottom surface of the stator slot 430 and the outer peripheral surface of the annular yoke portion 410. The thickness of the tooth portion 420 of the motor 40 and the thickness of the annular yoke portion 410 of the motor 40 directly determine the size of the stator slot 430 of the motor 40. In order to ensure a reasonable motor slot fill factor and current density, it is necessary to adjust the thickness of the tooth portion 420 and the annular yoke portion 410 of the motor 40.

[0222] An excessively large thickness of the tooth body 422 and an excessively small thickness of the annular yoke portion 410, or an excessively small thickness of the tooth body 422 and an excessively large thickness of the annular yoke portion 410 will all lead to an unreasonable design of the stator size of the motor 40, there are oversaturated and undersaturated regions in the magnetic density design, resulting in large magnetic leakage in the oversaturated region of the magnetic density, wasting materials in the undersaturated region of the magnetic density, and at the same time resulting in a low output torque of the motor 40, a large harmonic content of the motor 40, a poor back electromotive force waveform, a low efficiency of the motor 40, insufficient stiffness of the stator of the motor 40, large vibration and noise, and an increase in the manufacturing cost of the motor 40. In order to balance the cost of the motor 40 and the electromagnetic performance of the motor 40, it is necessary to perform a reasonable numerical matching on the thickness of the tooth portion 420 and the annular yoke portion 410 of the motor 40.

[0223] For this reason, the present application sets Lmin and T to satisfy 0.35 ≤ Lmin / T ≤ 0.85, making the numerical matching between the annular yoke portion 410 and the tooth portion 420 more reasonable, balancing the cost of the motor 40 and the electromagnetic performance of the motor 40, with a uniform magnetic density distribution, small magnetic leakage, a high copper ratio in the winding 700, a high material utilization rate of the motor 40, ensuring a reasonable current density of the motor 40 without increasing the manufacturing cost of the motor 40, maximizing the output torque and efficiency of the motor 40, and having good stiffness of the stator, which is beneficial to improving the vibration and noise of the motor 40.

[0224] In some embodiments, optionally, as Figure 4 and Figure 5As shown, the end face of the tooth boot 424 opposite to the rotor core 300 includes a second intermediate arc segment 4242, a third side arc segment 4244, and a fourth side arc segment 4246.

[0225] In the circumferential direction of the stator core 400, the second intermediate arc segment 4242 is located between the third side arc segment 4244 and the fourth side arc segment 4246.

[0226] The second intermediate arc segment 4242 protrudes towards the rotor core 300.

[0227] Either the third side arc segment 4244 or the fourth side arc segment 4246 is recessed towards the outer peripheral wall of the stator core 400.

[0228] In the circumferential direction of the stator core 400, the width of the third side arc segment 4244 is denoted as M1, the width of the second intermediate arc segment 4242 is denoted as M2, and the width of the fourth side arc segment 4246 is denoted as M3.

[0229] Wherein, 1.8 ≤ M1 / M2 ≤ 2.5, 1.8 ≤ M3 / M2 ≤ 2.5.

[0230] In this embodiment, the structure of the stator core 400 is further defined such that the end face of the tooth boot 424 opposite to the rotor core 300 includes a second intermediate arc segment 4242, a third side arc segment 4244, and a fourth side arc segment 4246. In the circumferential direction of the stator core 400, the second intermediate arc segment 4242 is located between the third side arc segment 4244 and the fourth side arc segment 4246.

[0231] The recessed direction of either the third side arc segment 4244 or the fourth side arc segment 4246 is opposite to the protruding direction of the second intermediate arc segment 4242.

[0232] In the circumferential direction of the stator core 400, the width of the third side arc segment 4244 is denoted as M1, the width of the second intermediate arc segment 4242 is denoted as M2, and the width of the fourth side arc segment 4246 is denoted as M3.

[0233] M1, M2, and M3 satisfy 1.8 ≤ M1 / M2 ≤ 2.5, 1.8 ≤ M3 / M2 ≤ 2.5.

[0234] Specifically, the synthetic magnetic field of the air gap 600 in the motor 40 includes a fundamental wave and harmonics, and the larger the fundamental wave, the smaller the harmonics. Moreover, the content and proportion of the fundamental wave and harmonics in the air gap 600 magnetic field directly determine the torque output ability and NVH (Noise, Vibration, Harshness) performance of the motor 40. And the larger the fundamental wave, the smaller the harmonics.

[0235] On the other hand, the torque ripple of the motor 40 also largely depends on the non-sinusoidality of the air-gap 600 magnetic field. The higher the harmonic content in the air-gap 600 magnetic field, the worse the output torque waveform of the motor 40. This not only affects the running smoothness of the motor 40 but also causes axial torsional vibration and crosstalk of the motor 40, further exacerbating the vibration and noise of the motor 40. The closer it is to non-sinusoidality, the greater the ripple, and the greater the NVH.

[0236] By setting the structure of the tooth boot 424, the end face of the tooth boot 424 facing the rotor core 300 includes a second intermediate arc segment 4242, a third side arc segment 4244, and a fourth side arc segment 4246. An unequal air-gap 600 that varies periodically along the circumference can be formed between the outer circumference of the rotor 30 and the inner circumference of the stator. It should be noted that the number of any one of the second intermediate arc segment 4242, the third side arc segment 4244, and the fourth side arc segment 4246 is equal to the number of tooth portions 420 of the motor 40.

[0237] And by defining the relationship between the width of the second intermediate arc segment 4242 and the widths of the third side arc segment 4244 and the fourth side arc segment 4246 to satisfy 1.8 ≤ M1 / M2 ≤ 2.5 and 1.8 ≤ M3 / M2 ≤ 2.5. That is, the ratio of the width of the third side arc segment 4244 to the width of the second intermediate arc segment 4242 satisfies 1.8 to 2.5, and the ratio of the width of the fourth side arc segment 4246 to the width of the second intermediate arc segment 4242 satisfies 1.8 to 2.5.

[0238] It can be understood that along the circumferential direction of the stator core 400, the width of the end face of the tooth boot 424 facing the rotor core 300 is equal to the sum of the widths of the second intermediate arc segment 4242, the third side arc segment 4244, and the fourth side arc segment 4246. This can make the transition of the air-gap 600 of the motor 40 more reasonable, reduce the harmonics caused by saturated slotting at the position of the tooth boot 424, and can greatly reduce the harmonic content of the air-gap 600 of the motor 40 on the basis of ensuring the unchanged output torque of the motor 40, effectively weakening the torque ripple and back electromotive force waveform of the motor 40, significantly reducing the radial electromagnetic force amplitude of the motor 40, thereby improving the vibration and noise of the motor 40, enhancing the performance of the motor 40, and this structural setting has the characteristics of simple structure and convenient processing, and the production cost of the product is low.

[0239] In some embodiments, optionally, as Figure 1 、 Figure 2 、 Figure 3 、 Figure 6 、 Figure 7 、 Figure 8 and Figure 11 shown, the motor 40 further includes a plurality of permanent magnets 500.

[0240] At least one permanent magnet 500 is disposed in any one of the plurality of magnet slots 120.

[0241] The number of permanent magnets 500 is denoted as n, and the number of magnet slots 120 is denoted as m.

[0242] Among them, m = k × p, k is a non-zero integer, and n ≥ m.

[0243] In this embodiment, the structure of the motor 40 is further defined such that the motor 40 further includes a plurality of permanent magnets 500, and the number m of magnet slots 120, the number n of permanent magnets 500, and the number of pole pairs P of the motor 40 satisfy m = k × p, k is a non-zero integer, and n ≥ m.

[0244] Specifically, if the magnet slot 120 is in a straight shape and there is only one magnet slot 120 under each pole, then the number of magnet slots 120 is m = p. And the number of permanent magnets 500 placed in each magnet slot 120 can be 1, 2, or more. n ≥ m. When the number of permanent magnets 500 in each magnet slot 120 is greater than or equal to 2, it helps to reduce the eddy current loss of the permanent magnets 500 and improve the output torque and efficiency of the motor 40. At the same time, the reduction of the eddy current loss of the permanent magnets 500 can improve the temperature rise of the permanent magnets 500, thereby reducing the grade of the permanent magnets 500 and the cost of the motor 40.

[0245] However, too many segmentation numbers will not only increase the processing and manufacturing difficulty and cost, but also increase the end leakage magnetic flux of the motor 40, resulting in a decrease in the utilization rate of the permanent magnets 500.

[0246] Specifically, the magnet slot 120 is in a V shape, and there are two magnet slots 120 under each pole, then the number of magnet slots 120 is m = 2 × p. The specific number of the permanent magnet 500 slots 120 will not be elaborated here.

[0247] In some embodiments, optionally, as Figure 11 , Figure 12 and Figure 14 shown, along the axial direction of the rotor 30, a plurality of rotor laminations 10 are divided into at least one iron core group 310.

[0248] The iron core group 310 includes a plurality of iron core segments 312.

[0249] The iron core segment 312 includes at least one rotor lamination 10.

[0250] Any two adjacent iron core segments 312 in the iron core group 310 are arranged with a circumferential offset on the rotor 30. The offset angle is denoted as θ. The total number of the iron core segments 312 of the plurality of iron core groups 310 is denoted as n, n ≥ 2. The number of stator slots 430 is denoted as Z; θ = θ0 + Δθ, θ0 = 360° / (n × Nc), Nc = LCM(Z, 2 × p), 0° ≤ Δθ ≤ θ0.

[0251] In this embodiment, along the axial direction of the rotor core 300, the rotor core 300 includes at least one core group 310. The core group 310 includes a plurality of core segments 312. Any two adjacent core segments 312 in the core group 310 are arranged with a circumferential dislocation in the rotor core 300. That is, the rotor core 300 is assembled in a segmented skewed pole manner, that is, at least two adjacent core segments 312 are arranged with a circumferential dislocation in the rotor core 300. The dislocation angle is θ, θ = θ0 + Δθ, θ0 = 360° / (n×Nc), where n is the total number of core segments 312 of the plurality of core groups 310, and n is a natural number greater than or equal to 2. Nc = LCM(Z, 2×p), Z is the number of stator slots 430, p is the number of pole pairs of the motor 40, and 0°≤Δθ≤θ0. Since the permanent magnet 500 in the motor 40 does not change the magnetic strength according to the position and state of the motor 40, during the circumferential operation, the magnetic poles of the permanent magnet 500 will generate different attractive forces on the stator slots 430 and the tooth parts 420 of the stator. The different attractive forces will cause the torque to fluctuate when the rotor 30 rotates, and this fluctuation will cause the vibration and noise of the operation of the motor 40.

[0252] Especially for high-power motors 40 such as vehicle permanent magnet synchronous motors, the vibration and noise caused by this reason are more obvious.

[0253] However, the optimization combination effect of the structural parameters in the motor 40 has a limited effect on improving the air-gap 600 magnetic field waveform. Especially the tooth harmonics, which are the main sources of the vibration and noise of the motor 40. Therefore, it is also necessary to combine the segmented skewed poles of the rotor 30 to further weaken the harmonic content. The segmented staggered poles of the rotor 30 can reduce the cogging torque and torque ripple, thereby reducing the electromagnetic vibration. In other words, by dividing the rotor core 300 into multiple core groups 310 and making there be a relative rotation angle between different core segments 312 in the core group 310, the specific harmonic content in the motor 40 can be effectively suppressed, the torque ripple and cogging torque of the motor 40 can be improved, and thus the effect of reducing the vibration and noise of the motor 40 can be achieved.

[0254] The segmented skewed poles can, while ensuring the electromagnetic torque of the motor 40, maximize the reduction of the end leakage magnetic flux of the permanent magnet 500, improve the utilization rate of the permanent magnet 500, weaken the cogging torque, and reduce the torque ripple of the motor 40. At the same time, it can improve the air-gap 600 magnetic field distribution, reduce the distortion rate of the air-gap 600 magnetic field, and improve the noise and vibration performance of the motor 40.

[0255] A power system according to some other embodiments of the present application includes: the motor 40 in any of the above embodiments.

[0256] The power system provided by this application includes the motor 40 as in any of the embodiments. Therefore, it has all the beneficial effects of the above-mentioned motor 40, and will not be elaborated one by one here.

[0257] Optionally, the power system includes a motor 40, a controller, and a speed reducer. The controller is electrically connected to the motor 40 and the speed reducer, and the controller controls the operation of the motor 40 and the speed reducer. The power system can meet the usage requirements of torque and power for the vehicle to move forward.

[0258] A vehicle according to some other embodiments of this application includes: the motor 40 as in the above embodiments; or the power system as in the above embodiments.

[0259] The vehicle provided by the present invention includes the motor 40 as in the above embodiments or the power system as in the above embodiments. Therefore, it has all the beneficial effects of the above-mentioned motor 40 or power system, and will not be elaborated one by one here.

[0260] It should be noted that the vehicle can be a new energy vehicle. New energy vehicles include pure electric vehicles, range-extended electric vehicles, hybrid vehicles, fuel cell electric vehicles, hydrogen engine vehicles, etc.

[0261] As Figure 1 、 Figure 2 and Figure 3 shown, this application proposes a concentrated winding motor applied to an electric vehicle, including a stator core 400, a rotor core 300, a plurality of permanent magnets 500, and a rotating shaft.

[0262] The stator core 400 includes an annular yoke portion 410 and a plurality of tooth portions 420. The plurality of tooth portions 420 are provided on the inner peripheral wall of the annular yoke portion 410, and the plurality of tooth portions 420 are arranged at intervals along the circumferential direction of the annular yoke portion 410.

[0263] An axial hole 110 is further provided on the punching sheet body 100, and a plurality of magnet slots 120 are arranged around the axial hole 110 at intervals on the punching sheet body 100. Each of the plurality of magnet slots 120 includes a permanent magnet segment 160 and a magnetic isolation segment 170 that communicate with each other. The permanent magnet segment 160 is used to accommodate the permanent magnet 500 of the rotor 30. Among them, the width w of the permanent magnet segment 160, the radius R1 of the first intermediate arc segment 130, and the number of pole pairs P of the motor 40 satisfy 0.32×π×R1 / p ≤ w ≤ 0.75×π×R1 / p.

[0264] The motor 40 of the present application includes a stator core 400, a rotor core 300, a plurality of permanent magnets 500 and a rotating shaft. The stator core 400 and the rotor core 300 are coaxially arranged, and the stator core 400 is disposed outside the rotor core 300. An air gap 600 is left between the stator core 400 and the rotor core 300. Optionally, the value of the air gap 600 in the direction from the rotor core 300 to the stator core 400 is greater than or equal to 0.5 mm.

[0265] As Figure 2 and Figure 3 shown, the rotor core 300 includes a punching sheet body 100. The punching sheet body 100 is provided with a plurality of magnet slots 120. The outer peripheral wall of the punching sheet body 100 includes a first intermediate arc segment 130, a first side arc segment 140 and a second side arc segment 150. The radius corresponding to the first intermediate arc segment 130 is denoted as R1, and the radius corresponding to the first side arc segment 140 is denoted as R2. R1 and R2 satisfy: 2 ≤ R1 / R2 ≤ 5.5. The outer peripheral wall of the punching sheet body 100 includes an outer peripheral segment on the axial end face, and the outer peripheral segment is a closed line segment. The outer peripheral segment includes a plurality of connected arc segments, and one arc segment corresponds to one magnet slot 120. It should be noted that the number of arc segments and the number of magnet slots 120 are both equal to the number of pole pairs p of the motor 40.

[0266] Let each arc segment include at least the first intermediate arc segment 130, the first side arc segment 140 and the second side arc segment 150. Then for the motor 40, an unequal air gap 600 that changes periodically in the circumferential direction can be formed between the outer peripheral wall of the rotor 30 and the inner peripheral wall of the stator, so as to form an alternation between the first side arc segment 140, the first intermediate arc segment 130 and the second side arc segment 150 on the outer peripheral circle of the rotor punching sheet 10, which can make the operation of the motor 40 more stable. At the same time, the magnetic field distribution of the rotor 30 is optimized, the armature reaction of the direct and quadrature axes is effectively weakened. On the basis of ensuring the unchanged peak torque of the motor 40, the torque ripple of the motor 40 is significantly improved, the running vibration noise of the motor 40 is reduced, and the user's comfort is improved.

[0267] At the same time, the iron loss of the stator and rotor 30 of the motor 40 is also reduced to a certain extent, which is beneficial to improving the efficiency of the motor 40. At the same time, by reasonably setting the relationship between R1 and R2 to satisfy 2 ≤ R1 / R2 ≤ 5.5, the present application not only takes into account the advantages of the integral circular design and the pure eccentric design of the rotor punching sheet 10, but also effectively improves the air gap 600 magnetic field, increases the air gap 600 magnetic density and the sinusoidality of the back electromotive force waveform, reduces the harmonic ratio, and further reduces the torque ripple, significantly reducing the vibration noise of the motor 40 without changing the average air gap 600 length of the motor 40 and ensuring the unchanged peak torque of the motor 40.

[0268] As Figure 2 and Figure 3As shown, a shaft hole 110 is provided in the middle of the punching sheet body 100. The shaft hole 110 is used to accommodate a rotating shaft. A plurality of magnet slots 120 are arranged around the shaft hole 110 at intervals on the punching sheet body 100. Each magnet slot 120 is axially penetrated. The magnet slot 120 is used to accommodate a permanent magnet 500. Each of the plurality of magnet slots 120 includes a permanent magnet section 160 and a magnetic isolation section 170. The permanent magnet section 160 and the magnetic isolation section 170 are interconnected. The permanent magnet section 160 is used to accommodate the permanent magnet 500 of the rotor 30. The permanent magnet 500 is embedded in the permanent magnet section 160. No permanent magnet 500 is provided in the magnetic isolation section 170, that is, the magnetic isolation section 170 is empty. The magnetic isolation sections 170 are respectively connected to both sides of the permanent magnet section 160.

[0269] Among them, the width of the permanent magnet 500 located in the permanent magnet section 160 is associated with the number of pole pairs of the motor 40 and the maximum radius of the motor 40 (i.e., the radius corresponding to the first intermediate arc section 130). Thus, the width of the permanent magnet 500 can be set within a reasonable range, avoiding problems such as too small a width of the permanent magnet 500, insufficient output performance of the motor 40, large content of the third harmonic of the magnetomotive force waveform, and large end leakage of the permanent magnet 500.

[0270] Make w, p, and R1 satisfy: 0.32×π×R1 / p ≤ w ≤ 0.75×π×R1 / p, which not only increases the utilization rate of the permanent magnet 500, improves the quality of the output torque of the motor 40, suppresses torque ripple, but also can achieve high power density and high efficiency, and reduce costs.

[0271] As Figure 15 shown, in a 24-slot 16-pole motor, the peak-to-peak value of the cogging torque of the motor 40 and the 24th-order radial electromagnetic force density of the motor 40 change with the change of R1 / R2. Among them, B1 represents the peak-to-peak value of the cogging torque, and B2 represents the 24th-order radial electromagnetic force density. It can be seen from Figure 15 that for the rotor 30 structure satisfying the above conditions, the peak-to-peak value of the cogging torque of the motor 40 and the 24th-order radial electromagnetic force density of the motor are low, which is beneficial to reducing the NVH of the motor 40 and improving the riding experience of the user's electric vehicle.

[0272] As Figure 16 shown, in a 24-slot 16-pole motor, the output torque and torque ripple of the motor 40 change with the change of (0.32×π×R1 / p ≤ w ≤ 0.75×π×R1 / p). Among them, B3 represents the output torque, and B4 represents the torque ripple. It can be seen from Figure 16It can be seen that as the ratio gradually increases, the rising slope of the output torque of the motor 40 gradually tends to be stable. At this time, the motor 40 is close to saturation. If the ratio is further increased, the increase in the output torque is small, and the utilization rate of the permanent magnet 500 will decrease. When w, p, and R1 satisfy: 0.32×π×R1 / p ≤ w ≤ 0.75×π×R1 / p, the utilization rate of the permanent magnet 500 of the motor 40 is high, the torque saturation degree is within a reasonable range, and the torque ripple of the motor 40 is small.

[0273] In the related art, the stator includes an annular yoke portion and a plurality of tooth portions. The annular yoke portion has an equal ring width structure, that is, both the inner peripheral wall and the outer peripheral wall of the annular yoke portion are regular circular surfaces. Combining Figure 17 As shown, in the present application, the annular yoke portion 410 has an unequal-width annular structure. The minimum thickness of the annular yoke portion 410 is Lmin, and Lmin and the width T of the tooth body 422 in the circumferential direction of the stator core 400 satisfy 0.35 ≤ Lmin / T ≤ 0.85.

[0274] A plurality of tooth portions 420 of the stator cooperate with the annular yoke portion 410, and two adjacent tooth portions 420 and the annular yoke portion 410 enclose a stator slot 430. An unequal yoke thickness is formed between the bottom surface of the stator slot 430 and the outer peripheral wall of the annular yoke portion 410. The width of the tooth portion 420 of the motor 40 and the thickness of the yoke portion of the motor 40 directly determine the size of the stator slot 430 of the motor 40.

[0275] In order to ensure a reasonable motor slot fill factor and current density magnitude, it is necessary to adjust the width of the tooth portion 420 of the motor 40 and the thickness of the yoke portion. An excessively large width of the tooth portion 420 and an excessively small thickness of the annular yoke portion 410, or an excessively small width of the tooth portion 420 and an excessively large thickness of the yoke portion will result in an unreasonable design of the stator size of the motor 40, there are oversaturated and undersaturated regions in the magnetic density design, resulting in large magnetic leakage in the oversaturated region of the magnetic density and wasting materials in the undersaturated region of the magnetic density. At the same time, it causes the output torque of the motor 40 to be low, the harmonic content of the motor 40 to be large, the back electromotive force waveform to be poor, the efficiency of the motor 40 to be low, the stator stiffness of the motor 40 to be insufficient, the vibration and noise to be large, and the manufacturing cost of the motor 40 to increase.

[0276] In order to balance the cost of the motor 40 and the electromagnetic performance of the motor 40, it is necessary to perform a reasonable numerical matching on the width of the tooth portion 420 of the motor 40 and the thickness of the yoke portion. For this reason, the present application makes Lmin and T satisfy 0.35 ≤ Lmin / T ≤ 0.85, making the parameter matching between the annular yoke portion 410 and the tooth portion 420 more reasonable, balancing the cost of the motor 40 and the electromagnetic performance of the motor 40, with uniform magnetic density distribution, small magnetic leakage, high copper occupancy ratio of the winding 700, high material utilization rate of the motor 40. While ensuring that the motor 40 has a reasonable current density, it does not increase the manufacturing cost of the motor 40, maximizes the output torque and efficiency of the motor 40, and the stator punching has good stiffness, which is beneficial to improving the vibration and noise of the motor 40.

[0277] Figure 17 It shows a schematic diagram of data comparison between the motor 40 in the related art and the motor 40 of the present application. With the same outer diameter of the rotor 30, the same built-in form of the permanent magnet 500, and the same number of turns of the copper wire, the copper ratio, peak torque, and efficiency of the motor 40 are different. From Figure 17 It can be seen that the copper ratio of the motor 40 of the present application is significantly increased, which can improve the utilization rate of the winding 700 of the motor 40 and reduce the copper loss of the motor 40. With the same volume of the motor 40, the present application achieves higher torque density and efficiency, enabling the electric vehicle to have better dynamic performance.

[0278] Such as Figure 5 and Figure 18 shown, the tooth part 420 includes a tooth boot 424. The end face of the tooth boot 424 facing the rotor core 300 includes a second intermediate arc segment 4242, a third side arc segment 4244, and a fourth side arc segment 4246. The concave sides of the third side arc segment 4244 and the fourth side arc segment 4246 are opposite to the concave side of the second intermediate arc segment 4242. The ratio of the width of the second intermediate arc segment 4242 to the width of any one of the third side arc segment 4244 and the fourth side arc segment 4246 satisfies 1.8 to 2.5.

[0279] Specifically, the synthesized magnetic field of the air gap 600 in the motor 40 includes a fundamental wave and harmonics. The larger the fundamental wave, the smaller the harmonics. And the content and ratio of the fundamental wave and harmonics in the air gap 600 magnetic field directly determine the torque output ability and NVH performance of the motor 40. And the larger the fundamental wave, the smaller the harmonics. On the other hand, the torque ripple of the motor 40 also depends to a large extent on the non-sinusoidality of the air gap 600 magnetic field. The higher the harmonic content in the air gap 600 magnetic field, the worse the output torque waveform of the motor 40. This not only affects the running stability of the motor 40, but also causes axial torsional vibration and crosstalk of the motor 40, further exacerbating the vibration and noise of the motor 40. The closer it is to non-sinusoidality, the larger the pulsation, and the greater the NVH.

[0280] By setting the structure of the tooth boot 424 such that the end face of the tooth boot 424 facing the rotor core 300 includes a second intermediate arc segment 4242, a third side arc segment 4244, and a fourth side arc segment 4246, an unequal air gap 600 that changes periodically along the circumference can be formed between the outer peripheral wall of the rotor 30 and the inner peripheral wall of the stator. It should be noted that the number of the second intermediate arc segment 4242, the third side arc segment 4244, and the fourth side arc segment 4246 is equal to the number of the tooth parts 420 of the motor 40.

[0281] And circumferentially along the stator core 400, the width of the third side arc segment 4244 is denoted as M1, the width of the second intermediate arc segment 4242 is denoted as M2, and the width of the fourth side arc segment 4246 is denoted as M3, where 1.8 ≤ M1 / M2 ≤ 2.5 and 1.8 ≤ M3 / M2 ≤ 2.5.

[0282] It can be understood that the width of the tooth boot 424 facing the end face of the rotor core 300 is equal to the sum of the widths of the second intermediate arc segment 4242, the third side arc segment 4244, and the fourth side arc segment 4246. In this way, the transition of the air gap 600 of the motor 40 can be made more reasonable, the harmonics caused by saturation slotting at the position of the tooth boot 424 can be reduced, and on the basis of ensuring that the output torque of the motor 40 remains unchanged, the harmonic content of the air gap 600 of the motor 40 can be greatly reduced, the torque ripple and back electromotive force waveform of the motor 40 can be effectively weakened, and the radial electromagnetic force amplitude of the motor 40 can be significantly reduced, thereby improving the vibration and noise of the motor 40 and enhancing the service performance of the motor 40. Moreover, the structure of the stator core 400 is simple, convenient for processing, and has low production cost.

[0283] As can be seen from Table 1, the motor 40 of the present application can make the back electromotive force waveform a sine wave, reduce the harmonic content of the air gap 600 magnetic field, and reduce the cogging torque and torque ripple rate of the motor 40. The tooth top of the tooth part 420 of the motor 40 in the related art is a regular arc surface, while a combined arc segment is adopted in the present application. Compared with the solution in the related art, the harmonic distortion rate of the air gap magnetic field of the motor 40 of the present application drops from 21.5% in the solution of the related art to 12.3%, the peak-to-peak value of the cogging torque of the motor 40 drops from 0.6 Nm to 0.2 Nm, and the torque ripple rate of the motor 40 drops from 6.9% to 3.8%, and its performance during operation is greatly optimized compared with the solution in the related art.

[0284] Table 1

[0285]

[0286] As Figure 18 shown, in the 24-slot 8-pole motor 40, the harmonic distortion rate of the air gap magnetic field and the iron loss of the motor 40 change with the change of α / p / 360. Among them, B5 represents the harmonic distortion rate of the air gap magnetic field, and B6 represents the iron loss of the motor 40. As can be seen from Figure 18 this, taking p = 16 as an example, the structure satisfying the above formula can effectively reduce the harmonic distortion rate of the air gap magnetic field and the iron loss of the motor 40, and improve the NVH quality and efficiency of the motor 40.

[0287] As Figure 6 , Figure 7 and Figure 8 shown, the number m of the magnet slots 120 and the number of pole pairs P of the motor 40 satisfy m = k × p, where k is a non-zero integer.

[0288] The number n of permanent magnets 500 and the number m of magnet slots 120 satisfy n≥m.

[0289] Specifically, as Figure 6 and Figure 7 shown, if the magnet slots 120 are in a straight line and there is only one magnet slot 120 under each pole, then the number of magnet slots 120 is m = p. And the number of permanent magnets 500 that can be placed in each magnet slot 120 can be 1, 2, or more. Then n≥m. When the number of permanent magnets 500 in each magnet slot 120 is greater than or equal to 2, it helps to reduce the eddy current loss of the permanent magnets 500 and improve the output torque and efficiency of the motor 40. At the same time, the reduction of the eddy current loss of the permanent magnets 500 can improve the temperature rise of the permanent magnets 500, thereby reducing the grade of the permanent magnets 500 and the cost of the motor 40. However, too many segmentation numbers will not only increase the processing and manufacturing difficulty and cost, but also increase the end leakage magnetic flux of the motor 40, resulting in a decrease in the utilization rate of the permanent magnets 500. As Figure 8 shown, the magnet slots 120 can also be in a V shape, and there are two magnet slots 120 under each pole, and the number of magnet slots 120 is m = 2p.

[0290] As Figure 11 and Figure 12 shown, in the 24-slot 16-pole motor, it includes three core segments 312. Adjacent two core segments 312 have a relative rotation angle, which can effectively suppress the specific harmonic content in the motor 40, improve the torque ripple and cogging torque of the motor 40, and thus achieve the effect of reducing the vibration and noise of the motor 40. The segmented skewed poles can, while ensuring the electromagnetic torque of the motor 40, maximize the reduction of the end leakage magnetic flux of the permanent magnets 500, improve the utilization rate of the permanent magnets 500, weaken the cogging torque, reduce the torque ripple of the motor 40, and at the same time improve the air-gap 600 magnetic field distribution, reduce the distortion rate of the air-gap 600 magnetic field, and improve the NVH performance of the motor 40.

[0291] To illustrate the optimization effects of the solution of the present application on the torque boosting ability, back electromotive force waveform, harmonics, cogging torque and torque fluctuation of the motor 40, Table 2 below gives the comparison results of the electromagnetic performance parameters of the motor 40 of the related technology and the motor 40 of the present application. That is, when the structures and dimensions of the stator and rotor punching sheets 10 of the motor 40 are selected according to the structures and parameter ranges in the present application, the electromagnetic performance of the motor 40 can be significantly improved. Compared with the solution of the related technology (for example, adjacent two core segments are not misaligned in the circumferential direction of the rotor), the torque density of the optimized motor 40 has increased by 15%, the torque ripple rate has decreased by 15.1%, the peak-to-peak value of the electromagnetic cogging torque has decreased by 90.2%, and the harmonic distortion rate of the back electromotive force of the motor 40 has decreased by 6.27%, effectively improving the performance of the motor 40.

[0292] Table 2

[0293] / Solutions of the related art Solutions of this application Torque density (Nm / L) 8.0 9.0 No-load line back electromotive force harmonic distortion rate (%) 7.07％ 0.8％ Cogging torque peak-to-peak value (Nm) 4.43 0.43 Torque ripple rate (%) 18.9％ 3.8％

[0294] In this application, the term "a plurality of" means two or more, unless otherwise clearly defined. Terms such as "installed", "connected", "coupled", "fixed", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; "coupled" can be a direct connection or an indirect connection through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0295] In the description of this specification, the descriptions of terms such as "one embodiment", "some embodiments", "specific embodiments", etc. mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of this application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or instance. Moreover, the specific features, structures, materials, or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. The above are only the preferred embodiments of this application and are not used to limit this application. For those skilled in the art, this application can have various changes and modifications. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of this application shall be included in the protection scope of this application.

Claims

1. A rotor punching sheet, characterized in that, include: A punching sheet body, wherein the punching sheet body is provided with an axial hole and a plurality of magnet slots, wherein the plurality of magnet slots are spaced apart and arranged around the axial hole; The portion of the outer peripheral wall of the punch body opposite to the magnet slot includes a first middle arc segment, a first side arc segment, and a second side arc segment, wherein the first middle arc segment is located between the first side arc segment and the second side arc segment; The magnet slot includes a permanent magnet segment and a magnetic isolation segment, the permanent magnet segment is connected to the magnetic isolation segment, and the magnet slot has a first end and a second end in the circumferential direction of the rotor punching; The radius corresponding to the first middle arc segment is recorded as R1, the width of the permanent magnet segment in the direction from the first end to the second end is recorded as w, and the number of pole pairs of the motor is recorded as p, wherein 0.32×π×R1 / p≤w≤0.75×π×R1 / p.

2. The rotor punching according to claim 1, characterized in that: The radius corresponding to the first side arc segment is recorded as R2, where 2≤R1 / R2≤5.

5.

3. The rotor punching sheet according to claim 1 or 2, characterized in that, Any one of the first side arc segment and the second side arc segment is connected to the first middle arc segment; The center of the circle corresponding to the first middle arc segment coincides with the center of the shaft hole; The center of a circle corresponding to any one of the first side arc segment and the second side arc segment is arranged separately from the center of the axial hole, and the center of the circle corresponding to the first side arc segment and the center of the circle corresponding to the second side arc segment are located on the same circumference; Any one of the first side arc segment and the second side arc segment is symmetrically arranged with the magnetic pole center line as a symmetry axis.

4. The rotor punching according to claim 1 or 2, characterized in that: There are two magnetic isolation segments, and the permanent magnet segment is connected between the two magnetic isolation segments; In the magnet slot, the connection points of the permanent magnet segment and the two magnetic isolation segments facing away from the axial hole are respectively recorded as the first vertex and the second vertex, a first radially extending line passing through the center of the axial hole intersects or is tangent to the first vertex, and a second radially extending line passing through the center of the axial hole intersects or is tangent to the second vertex, and an angle formed by the first radially extending line and the second radially extending line is recorded as a; Among them, a and p satisfy: 0.63×360 / p≤a≤0.87×360 / p.

5. The rotor punching according to claim 1 or 2, characterized in that: The portion of the punch body located between the magnet slot and the outer peripheral wall of the punch body is the first magnetic isolation bridge. The width of the first magnetic isolation bridge in the direction from the magnet slot to the outer peripheral wall of the punch body is recorded as d1, and the thickness of the punch body is recorded as d2, wherein d1≥2×d2.

6. The rotor punching sheet according to claim 1 or 2, characterized in that, The magnet slot includes a plurality of sub-slots, and the plurality of sub-slots are spaced apart along the circumference of the rotor punching sheet. Any one of the plurality of sub-slots includes the permanent magnet segment and two magnetic isolation segments, and the permanent magnet segment is connected between the two magnetic isolation segments. In the magnet slot, the portion of the punch body between two adjacent sub-slots is the second magnetic isolation bridge, the circumferential length of the second magnetic isolation bridge in the rotor punch is denoted as d3, and the thickness of the punch body is denoted as d2, wherein d3≥2×d2.

7. The rotor punching sheet according to claim 1 or 2, characterized in that, The punching sheet body is provided with a plurality of weight-reducing holes, which are arranged at intervals, and the weight-reducing holes are located on the magnetic pole center line or the inter-pole center line of the punching sheet body.

8. A rotor, characterized in that, include: The rotor core is formed by stacking a plurality of rotor punching sheets as described in any one of claims 1 to 7.

9. A motor, characterized in that, Comprising: The rotor as described in claim 8.

10. The motor according to claim 9, characterized in that, Further comprising: A stator core, the rotor core is rotatably arranged inside the stator core, and the stator core includes: An annular yoke portion, and the minimum value of the distance from the inner peripheral wall to the outer peripheral wall of the annular yoke portion is denoted as Lmin; A plurality of tooth portions, the plurality of tooth portions are arranged at intervals along the circumferential direction of the stator core, and any two adjacent tooth portions and the annular yoke portion enclose a stator slot. The tooth portion includes a tooth body and a tooth shoe. The tooth body is connected between the tooth shoe and the inner peripheral wall of the annular yoke portion. The tooth shoe is arranged opposite to the rotor core. The width of the tooth body in the circumferential direction of the stator core is denoted as T; Wherein, Lmin and T satisfy: 0.35 ≤ Lmin / T ≤ 0.

85.

11. The electric machine according to claim 10, characterized in that, The end face of the tooth shoe arranged opposite to the rotor core includes a second intermediate arc segment, a third side arc segment and a fourth side arc segment. Along the circumferential direction of the stator core, the second intermediate arc segment is located between the third side arc segment and the fourth side arc segment; The second intermediate arc segment protrudes towards the rotor core, and any one of the third side arc segment and the fourth side arc segment depresses towards the outer peripheral wall of the stator core; Along the circumferential direction of the stator core, the width of the third side arc segment is denoted as M1, the width of the second intermediate arc segment is denoted as M2, and the width of the fourth side arc segment is denoted as M3. Wherein, 1.8 ≤ M1 / M2 ≤ 2.5, 1.8 ≤ M3 / M2 ≤ 2.

5.

12. The electric machine according to any one of claims 9 to 11, characterized in that, Further comprising: A plurality of permanent magnets, at least one of the permanent magnets is arranged in any one of the plurality of magnet slots; The number of the permanent magnets is denoted as n, and the number of the magnet slots is denoted as m. Wherein, m = k×p, k is a non-zero integer, and n ≥ m.

13. The electric machine according to claim 10 or 11, characterized in that, Along the axial direction of the rotor, the plurality of rotor punching sheets are divided into at least one core group. The core group includes a plurality of core segments, and the core segment includes at least one of the rotor punching sheets; Any two adjacent core segments in the core group are arranged out of phase in the circumferential direction of the rotor, and the out-of-phase angle is denoted as θ. The total number of the core segments of the plurality of core groups is denoted as n, n ≥ 2, and the number of the stator slots is denoted as Z; θ = θ0 + Δθ, θ0 = 360° / (n×Nc), Nc = LCM(Z, 2×p), 0° ≤ Δθ ≤ θ0.

14. A power system, characterized in that, Comprising: The motor as described in any one of claims 9 to 13.

15. A vehicle, characterized in that, Comprising: The motor as described in any one of claims 9 to 13; Or The power system as described in claim 14.

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