Rotor staming, rotor, motor, and vehicle

Abstract

This application relates to a rotor lamination, a rotor, a motor, and a vehicle. The rotor lamination includes a shaft hole and a plurality of magnetic pole portions. The shaft hole is located at the center of the rotor lamination. The plurality of magnetic pole portions are arranged circumferentially at intervals along the shaft hole. Each magnetic pole portion includes a plurality of first magnetic slots for accommodating magnets. The plurality of first magnetic slots are arranged radially at intervals along the rotor lamination. Along the radial direction of the rotor lamination, the first magnetic slots closer to the shaft hole have a greater thickness.

Description

Technical Field

[0001] This application relates to the field of electric motor technology, and more particularly to a rotor lamination, rotor, motor, and vehicle. Prior Technology

[0002] As one of the core components of a drive system, motors are widely used in various fields such as transportation, construction, and industry. Among them, built-in permanent magnet synchronous motors have additional reluctance torque, resulting in higher output torque and stronger field weakening capability compared to surface-mounted permanent magnet synchronous motors, making them more popular in fields such as electric vehicles.

[0003] The output torque of a motor includes electromagnetic torque and reluctance torque. Electromagnetic torque is generated by the interaction of the stator magnetic field and the rotor magnetic field, while reluctance torque is generated by the unequal reluctance (or inductance) between the rotor's direct and quadrature axes. How to maximize the electromagnetic torque within the limited space of the rotor without reducing the reluctance torque, thereby increasing the motor's total output torque, is a challenging problem in motor technology. Summary of the Invention

[0004] To address the aforementioned problems, this application provides a rotor lamination. By specifically optimizing the structure of the rotor lamination, it ensures a large reluctance torque while increasing the amount of magnets that can be filled within the limited space of the rotor lamination, thereby increasing the electromagnetic torque and ultimately improving the motor's output torque. Furthermore, this application also provides a rotor, motor, and vehicle equipped with this rotor lamination, specifically including the following solutions:

[0005] In a first aspect, this application provides a rotor lamination, including a shaft hole and a plurality of magnetic pole portions. The shaft hole is located at the center of the rotor lamination, and the plurality of magnetic pole portions are arranged circumferentially at intervals along the shaft hole. Each magnetic pole portion includes a plurality of first magnetic slots for accommodating magnets. The plurality of first magnetic slots are arranged radially at intervals along the rotor lamination, and along the radial direction of the rotor lamination, the first magnetic slots closer to the shaft hole have a greater thickness.

[0006] This application utilizes shaft holes in rotor laminations for mounting the motor shaft and multiple magnetic pole sections to generate a magnetic field, with an even number of pole sections. Specifically, each magnetic pole section contains multiple first magnet slots to accommodate magnets that provide the rotor's magnetic field, facilitating interaction with the motor's stator magnetic field to generate electromagnetic torque. Since the permeability of the first magnet slots is lower than that of the rotor lamination body, the first magnet slots can act as part of a magnetic barrier, creating a difference in magnetic reluctance between the direct and quadrature axes, thereby generating reluctance torque. By strategically arranging the multiple first magnet slots radially spaced along the rotor laminations, multiple layers of magnetic barriers are rationally formed within the limited space of the rotor laminations, increasing the magnetic reluctance of the direct axis, increasing the difference between the direct and quadrature axes, and thus improving the reluctance torque.

[0007] Furthermore, by setting multiple first magnet slots along the radial direction of the rotor lamination, the thickness of the first magnet slots closer to the shaft hole is increased. That is, from the outer edge of the rotor lamination to the shaft hole, the thickness of the multiple first magnet slots increases in an incremental manner. This increases the volume of the first magnet slots while keeping the number of magnetic barrier layers constant, ensuring that more magnets can be accommodated. This maximizes the electromagnetic torque within the limited radial space of the rotor lamination. In addition, since the heavier portions of the multiple first magnet slots after being filled with magnets are closer to the shaft hole of the rotor lamination, and the lighter portions are closer to the outer edge of the rotor lamination, the centrifugal stress on the magnets in the first magnet slots is minimized when the rotor lamination rotates, thus preventing easy damage to the rotor lamination.

[0008] Understandably, this application, by rationally designing the arrangement of multiple first magnet slots in the rotor lamination and optimizing the structure of the multiple first magnet slots, ensures that, under the condition of having a large reluctance torque, the amount of magnets that can be filled in the limited space of the rotor lamination can be increased, thereby further increasing the electromagnetic torque provided by the magnets in the first magnet slots, and thus improving the output torque.

[0009] In one embodiment, the magnetic pole portion includes a plurality of second magnetic slots for accommodating magnets. The plurality of second magnetic slots are arranged on both sides of a plurality of first magnetic slots. A second magnetic slot is provided on both sides of each first magnetic slot. The extension lines of the two second magnetic slots on both sides of each first magnetic slot intersect at the ends of the two slots that are closer to the shaft hole.

[0010] In one embodiment, the included angle between the two second magnet slots on both sides of each first magnet slot is α, and π / p < α < 2π / p, where p is the number of motor pole pairs.

[0011] In one embodiment, among the multiple second magnet slots located on the same side of the multiple first magnet slots, the second magnet slot closer to the shaft hole has a larger thickness.

[0012] In one embodiment, the magnetic pole portion includes a third magnetic slot for accommodating a magnet, the third magnetic slot being located radially along the rotor lamination on the side opposite to the shaft hole of the plurality of first magnetic slots.

[0013] In one embodiment, the third magnet groove is strip-shaped and is arranged parallel to the first magnet groove; or,

[0014] The third magnet slot includes two first sub-magnet slots arranged in a V-shape, with an included angle of β, where 2π / p < β < π, and p is the number of motor pole pairs; or,

[0015] The third magnet slot is arc-shaped, and the curvature of the third magnet slot is β, where 2π / p < β < π, and p is the number of pole pairs of the motor.

[0016] In one embodiment, the magnetic pole portion includes a fourth magnetic slot for accommodating a magnet. The fourth magnetic slot is located between the third magnetic slot and a plurality of first magnetic slots. The number of fourth magnetic slots is one, and the fourth magnetic slot is U-shaped; or,

[0017] There are two fourth magnet slots, and the two fourth magnet slots are arranged in a V-shape.

[0018] In one embodiment, on the end face of the rotor lamination, the rotor lamination includes a direct axis and a quadrature axis. The direct axis is the central axis of symmetry of a plurality of first magnet slots, and the quadrature axis is the perpendicular bisector between two adjacent magnetic pole portions. The intersection point of the direct axis and the outer edge of the rotor lamination is M. The length of the perpendicular line from the quadrature axis through point M is LMN. The thickness Hmin of the second magnet slot with the smallest thickness among the plurality of second magnet slots is greater than LMN / (2n+1), where n is half the number of second magnet slots in each magnetic pole portion.

[0019] In one embodiment, from the shaft hole toward the outer edge of the rotor lamination, the thicknesses of each of the plurality of first magnet slots are H1, H2, H3..., respectively, and H1:H2:H3:...=2Hmin:5 / 3Hmin:4 / 3Hmin:....

[0020] In one embodiment, a reinforcing rib is provided between each first magnet slot and each second magnet slot, the reinforcing rib being used to improve the strength of the rotor laminations.

[0021] In one embodiment, the minimum width of the reinforcing rib gradually increases from the outer edge of the rotor lamination towards the shaft hole.

[0022] In one embodiment, in the direction from the shaft hole toward the outer edge of the rotor lamination, the minimum widths of each of the plurality of reinforcing ribs are W1, W2, W3..., and 4 / 3... <W1 / W2<2,11 / 10<W2 / W3<6 / 5。

[0023] In one embodiment, a portion of the first magnet slot includes two second sub-magnet slots arranged in a V-shape, and the included angle between the two second sub-magnet slots is γ, where 2π / p < γ < π, and p is the number of motor pole pairs.

[0024] In one embodiment, the rotor lamination is provided with a weight reduction hole that extends through its own axial direction, and the weight reduction hole is located on the side of the plurality of first magnet slots opposite to the shaft hole.

[0025] Secondly, this application provides a rotor comprising a plurality of magnets and rotor laminations as described in any of the above embodiments.

[0026] Thirdly, this application provides a motor including a stator and rotor laminations or a rotor as described in any of the above embodiments. The stator surrounds the periphery of the rotor laminations.

[0027] Fourthly, this application provides a vehicle including a body and a motor as described in any of the above embodiments, wherein the motor is fixed to the body. Simple Explanation of the Diagram

[0028] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0029] Figure 1 is a schematic diagram of the transverse cross-sectional structure of the rotor provided in one embodiment of this application; Figure 2 is a schematic diagram of the rotor lamination provided in one embodiment of this application; Figure 3 is a schematic diagram of the structure of one of the magnetic pole portions of the rotor lamination provided in the first embodiment of this application; Figure 4 is a schematic diagram of the structure of one of the magnetic pole portions of the rotor lamination provided in the second embodiment of this application; Figure 5 is a schematic diagram of the structure of one of the magnetic pole portions of the rotor lamination provided in the third embodiment of this application; Figure 6 is a schematic diagram of the structure of one of the magnetic pole portions of the rotor lamination provided in the fourth embodiment of this application; Figure 7 is a schematic diagram of the structure of one of the magnetic poles of the rotor lamination provided in the fifth embodiment of this application. Implementation

[0030] To facilitate understanding of this application, a more complete description will be provided below with reference to the accompanying drawings. Preferred embodiments of this application are shown in the drawings. However, this application can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of the disclosure of this application.

[0031] The following descriptions of the embodiments are based on the accompanying illustrations and are used to illustrate specific embodiments in which this application can be implemented. The component designations used herein, such as "first," "second," etc., are merely for distinguishing the described objects and have no sequential or technical meaning. Unless otherwise specified, the terms "connection" and "linkage" in this application include both direct and indirect connections (linkages). Directional terms used in this application, such as "up," "down," "front," "back," "left," "right," "inner," "outer," "side," etc., are merely for reference to the accompanying illustrations. Therefore, the use of directional terms is for better and clearer explanation and understanding of this application, and does not indicate or imply that the referred device or element must have a specific orientation, or be constructed and operated in a specific orientation; therefore, they should not be construed as limitations on this application.

[0032] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "joint" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two elements. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances. It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish different objects, not to describe a specific order. Furthermore, the terms "comprising," "may include," "include," or "may include" used in this application indicate the presence of the corresponding disclosed function, operation, element, etc., and do not limit one or more other functions, operations, elements, etc. Moreover, the terms "comprising" or "include" indicate the presence of the corresponding features, number, steps, operations, elements, components, or combinations thereof disclosed in the specification, but do not exclude the presence or addition of one or more other features, number, steps, operations, elements, components, or combinations thereof, and are intended to cover non-exclusive inclusion.

[0033] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of this application.

[0034] The motor provided in this application can be used in vehicles. The motor includes a stator and a rotor, with the stator surrounding the rotor. The rotor can be composed of multiple magnets and multiple rotor laminations. The vehicle can be an electric vehicle, and the motor can serve as a drive motor to provide driving force for the vehicle. However, since the drive motor operates at high speeds and is limited by the yield strength of the silicon steel sheets, the drive motor can only be designed to be miniaturized.

[0035] Please refer to Figures 1 to 3, where Figure 1 is a schematic diagram of the transverse cross-sectional structure of the rotor 100 provided in one embodiment of this application; Figure 2 is a schematic diagram of the structure of the rotor lamination 20 provided in one embodiment of this application; and Figure 3 is a schematic diagram of the structure of one of the magnetic pole portions 22 of the rotor lamination 20 provided in the first embodiment of this application.

[0036] As shown in Figures 1 to 3, the rotor 100 provided in this application includes magnets 10 and rotor laminations 20. The rotor 100 of this motor is an internal rotor, meaning the magnets 10 are filled and embedded inside the rotor laminations 20. The magnetic field generated by the magnets 10 can interact with the magnetic field of the motor's stator to form electromagnetic torque. From the perspective of the motor rotor 100, the electromagnetic torque of the motor is mainly determined by the characteristics of the magnets 10 themselves. Specifically, the rotor laminations 20 include shaft holes 21 and magnetic pole portions 22. The shaft hole 21 is located at the center of the rotor laminations 20 and is used to mount the motor's shaft. There are multiple magnetic pole portions 22, which are spaced circumferentially along the shaft hole 21 to generate a magnetic field, wherein the number of magnetic pole portions 22 is even. In the embodiment shown in Figure 1, the number of magnetic pole portions 22 is 8, and the number of pole pairs of the motor is 4. Each magnetic pole section 22 has a plurality of magnetic steel slots 30, which penetrate the body of the rotor lamination 20 along the axial direction of the rotor lamination 20 to accommodate the filler magnets 10.

[0037] It should be noted that, since the permeability of the air in the magnet slot 30 is lower than that of the rotor lamination 20, the magnet slot 30 can be configured as a magnetic barrier on the rotor lamination 20. The presence of the magnetic barrier can reduce the magnetic flux in the corresponding direction, so that a difference in magnetic reluctance occurs between the direct axis (d-axis, the central axis of symmetry of each magnetic pole 22 along the radial direction of the rotor lamination 20) and the quadrature axis (q-axis, the perpendicular bisector between two adjacent magnetic poles 22), thereby generating reluctance torque. Understandably, from the perspective of the rotor 100, the reluctance torque of the motor is mainly determined by the number of layers of magnetic barriers.

[0038] The plurality of magnet slots 30 includes first magnet slots 31, and there are multiple first magnet slots 31. The plurality of first magnet slots 31 are arranged radially spaced along the rotor laminations 20. Each first magnet slot 31 may be symmetrical about a direct axis. It is understood that the plurality of first magnet slots 31 are arranged radially spaced along the rotor laminations 20 in a targeted manner to reasonably form multiple layers of magnetic barriers within the limited space of the rotor laminations 20, thereby increasing the magnetic reluctance at the central axis of symmetry of each magnetic pole portion 22, increasing the difference in magnetic reluctance between the central axis of symmetry of each magnetic pole portion 22 and the perpendicular bisector between adjacent magnetic pole portions 22, and thus improving the magnetic reluctance torque.

[0039] Furthermore, along the radial direction of the rotor lamination 20, the thickness of the first magnet slots 31 closer to the shaft hole 21 is greater. That is, from the outer edge of the rotor lamination 20 to the shaft hole 21, the thickness of the multiple first magnet slots 31 increases in an incremental manner. This increases the volume of the first magnet slots 31 with a fixed number of magnetic barrier layers, ensuring that more magnets 10 can be accommodated. This maximizes the electromagnetic torque within the limited radial space of the rotor lamination 20. In addition, since the heavier portions of the multiple first magnet slots 31 after being filled with magnets 10 are closer to the shaft hole 21 of the rotor lamination 20, and the lighter portions are closer to the outer edge of the rotor lamination 20, the centrifugal stress on the magnets 10 in the first magnet slots 31 is minimized when the rotor lamination 20 rotates, thus preventing the rotor lamination 20 from being easily damaged.

[0040] Understandably, this application, by rationally designing the arrangement of multiple first magnet slots 31 in the rotor lamination 20 and optimizing the structure of the multiple first magnet slots 31, ensures that, under the condition of having a large reluctance torque, the amount of magnets 10 that can be filled in the limited space of the rotor lamination 20 can be increased, thereby further increasing the electromagnetic torque provided by the magnets 10 in the first magnet slots 31, and thus improving the output torque.

[0041] It should be noted that since the magnetic permeability of magnet 10 is not much different from that of air, filling magnet 10 into magnet slot 30 does not affect the original performance of the magnetic barrier, that is, it does not affect the magnetic reluctance torque generated by magnet slot 30.

[0042] It should be noted that the number of magnetic pole portions 22 in the above embodiments is only an example, that is, the number of magnetic pole portions is not limited to 8, as long as it is an even number. This application does not make any special limitation on this. For example, the number of magnetic pole portions 22 can be 6, 4, etc., in which case the number of pole pairs of the motor corresponds to 3 and 2 respectively.

[0043] In one embodiment, each magnetic pole portion 22 has a magnetic slot 30 including a second magnetic slot 32. There are multiple second magnetic slots 32, which can accommodate the magnet 10. The multiple second magnetic slots 32 are arranged on both sides of multiple first magnetic slots 31. One second magnetic slot 32 is provided on each side of each first magnetic slot 31. The two second magnetic slots 32 on each side of each first magnetic slot 31 are symmetrical about a right axis, and the extension lines of the two second magnetic slots 32 on each side of each first magnetic slot 31 intersect at the end closest to the shaft hole 21. That is, the two second magnetic slots 32 on each side of each first magnetic slot 31 are arranged in a V-shape.

[0044] Understandably, in this embodiment, a second magnetic groove 32 is provided on both sides of each first magnetic groove 31, and every two second magnetic grooves 32 together with one first magnetic groove 31 form a magnetic barrier to improve the reluctance torque of the motor. Simultaneously, magnets 10 can be filled into the second magnetic grooves 32 to improve the electromagnetic torque of the motor. Furthermore, arranging the two second magnetic grooves 32 on both sides of each first magnetic groove 31 in a V-shape can improve the magnetization effect and is beneficial to improving the performance of the motor.

[0045] Please refer to Figure 4 for details. Figure 4 is a schematic diagram of the structure of one of the magnetic pole portions 22 of the rotor lamination 20 provided in the second embodiment of this application.

[0046] As shown in Figure 4, in one embodiment, among the multiple second magnetic grooves 32 located on the same side of the multiple first magnetic grooves 31, the thickness of the second magnetic groove 32 closer to the shaft hole 21 is greater. It is understandable that, based on the fact that the thickness of the first magnetic groove 31 closer to the shaft hole 21 is greater, this embodiment sets the thickness of the second magnetic groove 32 closer to the shaft hole 21 to also be greater. This ensures the uniformity of the magnetic barrier and, with a fixed number of magnetic barrier layers, further increases the space in the second magnetic groove 32 that can hold the magnets 10, thereby increasing the number of magnets 10 filled in each magnetic pole portion 22 and improving the electromagnetic torque of the motor. Furthermore, it also reduces the centrifugal stress on the magnets 10 filled in the second magnetic groove 32, ensuring the service life of the magnets 10.

[0047] In the above embodiments, the second magnet slot 32 is strip-shaped and extends radially along the rotor lamination 20, that is, the second magnet slot 32 is parallel to the radial direction of the rotor lamination 20. It can be understood that setting the second magnet slot 32 parallel to the radial direction of the rotor lamination 20 ensures that the rotor lamination 20 experiences uniform force on all parts when the rotor 100 rotates, ensuring the structural stability of the rotor lamination 20, while also improving the space utilization of the rotor lamination 20. In other embodiments, the second magnet slot 32 may be set not to be parallel to the radial direction of the rotor lamination 20. Specifically, please refer to Figure 5, which is a structural schematic diagram of one of the magnetic pole portions 22 of the rotor lamination 20 provided in the third embodiment of this application.

[0048] As shown in Figure 5, in one embodiment, the second magnet slot 32 is also strip-shaped, and there is an angle between the second magnet slot 32 and the radial direction of the rotor lamination 20. Specifically, along the direction of the shaft hole 21 toward the outer edge of the rotor lamination 20, the second magnet slot 32 extends obliquely from near the straight axis toward the direction away from the straight axis. At this time, by reasonably arranging the relative positions between the first magnet slot 31 and the second magnet slot 32, the structural stability of the rotor lamination 20 and the high space utilization rate can also be guaranteed. In addition, the magnetization effect can be improved, which is beneficial to improving the performance of the motor.

[0049] In one embodiment, in each magnetic barrier, the included angle between the two second magnetic slots 32 on both sides of each first magnetic slot 31 is α, and π / p < α < 2π / p, where p is the number of pole pairs of the motor. For example, in the embodiment shown in Figure 1, the number of pole pairs of the motor p is 4, and the included angle α is in the range of π / 4 < α < π / 2. It can be understood that setting the included angle α between the two second magnetic slots 32 on both sides of each first magnetic slot 31 between π / p < α < 2π / p can, on the one hand, avoid the included angle α being too small, resulting in a small width of the second magnetic slot 32 and low torque power; on the other hand, it can avoid the included angle α being too large, resulting in low utilization of the magnets 10 filling the second magnetic slots 32, thereby affecting the electromagnetic torque and reluctance torque.

[0050] In one embodiment, each magnetic pole portion 22 has a magnetic slot 30 including a third magnetic slot 33. The number of third magnetic slots 33 is one, and the third magnetic slot 33 is located radially along the rotor lamination 20 on the side of the plurality of first magnetic slots 31 opposite to the shaft hole 21. It is understood that providing the third magnetic slot 33 on the side of the plurality of first magnetic slots 31 opposite to the shaft hole 21 further utilizes the remaining space in the rotor lamination 20, increases the capacity of the magnets 10 that can be filled within the rotor lamination 20, and thereby further improves the electromagnetic torque.

[0051] In the embodiment shown in Figure 3, the third magnet slot 33 is strip-shaped and arranged parallel to the first magnet slot 31, meaning the length direction of the third magnet slot 33 is perpendicular to the radial direction of the rotor lamination 20. In the embodiments shown in Figures 5 and 6 (Figure 6 is a schematic diagram of the structure of one of the magnetic pole portions 22 of the rotor lamination 20 provided in the fourth embodiment of this application), the third magnet slot 33 includes two first sub-magnet slots 331, which are arranged in a V-shape and symmetrical about the direct axis. The included angle between the two first sub-magnet slots 331 is β, where 2π / p < β < π, and p is the number of motor pole pairs. Understandably, setting the included angle β between the two first sub-magnet slots 331 within the range of 2π / p < β < π can, on the one hand, avoid the included angle β being too small, resulting in a small width of the first sub-magnet slot 331 and low torque power; on the other hand, it can avoid the included angle β being too large, resulting in low utilization of the magnets 10 filled in the first sub-magnet slots 331, thereby affecting the electromagnetic torque and reluctance torque.

[0052] In another embodiment, referring to Figure 7, which shows a schematic diagram of the structure of one of the magnetic pole portions 22 of the rotor lamination 20 provided in the fifth embodiment of this application, the third magnet slot 33 can be arc-shaped, and the curvature of the third magnet slot 33 is β, where 2π / p < β < π, and p is the number of motor pole pairs. Similarly, setting the curvature β of the third magnet slot 33 within the range of 2π / p < β < π can, on the one hand, avoid an angle β that is too small, resulting in a small width of the third magnet slot 33 and low torque power; on the other hand, it can avoid an angle β that is too large, resulting in low utilization of the magnets 10 filling the third magnet slot 33, thereby affecting the electromagnetic torque and reluctance torque.

[0053] Referring back to Figure 3, in one embodiment, each magnetic pole portion 22's magnetic slot 30 further includes a fourth magnetic slot 34, and the number of fourth magnetic slots 34 is one. The fourth magnetic slot 34 is located between the third magnetic slot 33 and the plurality of first magnetic slots 31, and in this case, the fourth magnetic slot 34 can be arranged in a U-shape. It can be understood that by utilizing the space between the third magnetic slot 33 and the first magnetic slots 31 to arrange the fourth magnetic slot 34, the number of magnetic barrier layers of the rotor lamination 20 can be increased, and the space that can be filled with magnets 10 can also be increased, thereby further improving the reluctance torque and electromagnetic torque. Furthermore, arranging the fourth magnetic slot 34 in a U-shape can ensure the integrity of the magnetic barrier formed by the fourth magnetic slot 34.

[0054] In the embodiments shown in Figures 5 and 7, there are two fourth magnet slots 34, both located between the third magnet slot 33 and the first magnet slot 31, and arranged in a V-shape. This increases the number of magnetic barrier layers, increases the space available to fill the magnets 10, and also improves the magnetization effect.

[0055] Referring to Figure 3, in one embodiment, the rotor lamination 20 includes a direct axis and a quadrature axis on its end face. The direct axis is the central axis of symmetry of the plurality of first magnet slots 31, i.e., the d-axis; the quadrature axis is the perpendicular bisector between two adjacent magnetic pole portions 22, i.e., the q-axis. The intersection point of the direct axis and the outer edge of the rotor lamination 20 is M, and the intersection point of the perpendicular line passing through point M on the quadrature axis and the quadrature axis is N. The length of the perpendicular line is LMN. The thickness Hmin of the second magnet slot 32 with the smallest thickness among the plurality of second magnet slots 32 is greater than LMN / (2n+1), where n is half the number of second magnet slots 32 in each magnetic pole portion 22.

[0056] In this embodiment, the thickness range of the second magnet groove 32 with the smallest thickness is set to: Hmin>LMN / (2n+1), which can ensure that each second magnet groove 32 has enough space to fill the magnet 10, thereby ensuring the filling amount of the magnet 10.

[0057] Preferably, in one embodiment, the thicknesses of the first magnet slots 31 in the plurality of first magnet slots 31 are H1, H2, H3… respectively, from the shaft hole 21 toward the outer edge of the rotor lamination 20, and H1:H2:H3:…=2Hmin:5 / 3Hmin:4 / 3Hmin:…. It is understood that setting the thickness relationship between the first magnet slots 31 in the plurality of first magnet slots 31 to satisfy: H1:H2:H3:…=2Hmin:5 / 3Hmin:4 / 3Hmin:… can both increase the filling amount of magnets 10 in the rotor lamination 20 to increase the electromagnetic torque, and ensure that the centrifugal stress in the region of the rotor lamination 20 relatively far from the shaft hole 21 is small, thereby improving the strength of the rotor lamination 20.

[0058] In one embodiment, a reinforcing rib 40 is provided between each first magnet slot 31 and each second magnet slot 32. The reinforcing rib 40 can be used to improve the strength of the rotor lamination 20 and ensure the service life of the rotor lamination 20.

[0059] Specifically, the minimum width of the reinforcing rib 40 gradually increases from the outer edge of the rotor lamination 20 towards the shaft hole 21. This design ensures that the rotor lamination 20 can be provided with a large number of first magnet slots 31 and second magnet slots 32, while also preventing stress concentration in the area of ​​the rotor lamination 20 near the shaft hole 21, which could lead to cracking and damage of the rotor lamination 20.

[0060] Preferably, in the direction from the shaft hole 21 toward the outer edge of the rotor lamination 20, the minimum widths of each of the plurality of reinforcing ribs 40 are W1, W2, W3... respectively, and 4 / 3 <W1 / W2<2,11 / 10<W2 / W3<6 / 5。

[0061] Please refer to Figure 6. In one embodiment, a portion of the first magnet slot 31 includes two second sub-magnet slots 311. Specifically, the first magnet slot 31 that is relatively close to the shaft hole 21 includes two second sub-magnet slots 311. The two second sub-magnet slots 311 are arranged in a V-shape, and the included angle between the two second sub-magnet slots 311 is γ, where 2π / p < γ < π, and p is the number of motor pole pairs.

[0062] Understandably, the arrangement of the first magnet slot 31 including two second sub-magnet slots 311 arranged in a V-shape simplifies the manufacturing process of the rotor laminations 20 and improves the magnetizing effect of the first magnet slot 31. Furthermore, setting the included angle γ between the two second sub-magnet slots 311 within the range of 2π / p < γ < π avoids both excessively small angles (resulting in a narrow width and low torque power) and excessively large angles (resulting in low utilization of the magnets 10 filling the second sub-magnet slots 311, thus affecting electromagnetic torque and reluctance torque.

[0063] In the embodiment shown in Figure 6, the rotor lamination 20 is provided with a weight-reducing hole 50 extending through its own axial direction. The weight-reducing hole 50 is located on the side of the plurality of first magnet slots 31 opposite to the shaft hole 21, and on the side of the third magnet slot 33 opposite to the shaft hole 21. That is, the weight-reducing hole 50 is relatively close to the outer edge of the rotor lamination 20. It can be understood that the design of the weight-reducing hole 50 can not only reduce the weight of the rotor lamination 20, but also serve as an oil leakage hole to guide lubricating oil to wet the rotor 100, thereby improving the lubrication effect of the rotor 100. In addition, by placing the weight-reducing hole 50 on the side of the plurality of first magnet slots 31 opposite to the shaft hole 21, the weight of the outer edge of the rotor lamination 20 can be specifically reduced, thereby reducing the negative impact of centrifugal stress.

[0064] It should be noted that the position of the weight reduction hole 50 in the above embodiments is only an example. For example, in the embodiments shown in Figures 5 and 7, the weight reduction hole 50 can be located in the radial direction of the rotor lamination 20, between the third magnet slot 33 and the fourth magnet slot 34, and can also achieve the same beneficial effect as described above.

[0065] In one embodiment, the magnets 10 filling each magnet slot 30 are all ferrite magnets. Through the above-described optimized design of the magnet slot 30, and based on the lower cost of ferrite magnets, this application uses ferrite magnets for filling. Compared with the prior art's scheme of mixing rare earth magnets and ferrite magnets, this not only achieves the same output torque as the prior art, but also significantly reduces costs.

[0066] It should be understood that the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, features defined as "first" or "second" may explicitly or implicitly include one or more of the stated features. In the description of embodiments of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0067] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0068] It should be understood that the application of this application is not limited to the examples above. Those skilled in the art can make improvements or modifications based on the above description, and all such improvements and modifications should fall within the protection scope of the appended claims. Those skilled in the art will understand that implementing all or part of the processes of the above embodiments, and making equivalent changes according to the claims of this application, still falls within the scope of this application.

[0069] 100: Rotor 10: Magnet 20: Rotor laminations 21: Shaft Hole 22: Magnetic pole section 30: Magnetic steel channel 31: First magnetic steel trough 311: Second Sub-Magnetic Slot 32: Second magnetic slot 33: Third Magnetic Slot 331: First sub-magnetic steel channel 34: Fourth Magnetic Slot 40: Reinforcing rib 50: Weight reduction hole

Claims

1. A rotor lamination, comprising a shaft hole and a plurality of magnetic pole portions, the shaft hole being located at the center of the rotor lamination, the plurality of magnetic pole portions being arranged circumferentially spaced along the shaft hole, each magnetic pole portion comprising a plurality of first magnetic slots for accommodating magnets, the plurality of first magnetic slots being arranged radially spaced along the rotor lamination, and along the radial direction of the rotor lamination, the thickness of the first magnetic slots closer to the shaft hole is greater, wherein the magnetic pole portion comprises a plurality of second magnetic slots for accommodating magnets, the plurality of second magnetic slots being arranged on both sides of the plurality of first magnetic slots, one second magnetic slot being disposed on each side of each first magnetic slot, and the extension lines of the two second magnetic slots on each side of each first magnetic slot intersecting at the ends closer to the shaft hole. On the end face of the rotor lamination, the rotor lamination includes a straight axis and a cross axis. The straight axis is the central axis of symmetry of the plurality of first magnet slots. The cross axis is the perpendicular bisector between two adjacent magnetic pole portions. The intersection point of the straight axis and the outer edge of the rotor lamination is M. The length of the perpendicular line from the cross axis through point M is LMN. The thickness Hmin of the second magnet slot with the smallest thickness among the plurality of second magnet slots is greater than LMN / (2n+1), where n is half the number of second magnet slots in each magnetic pole portion.

2. The rotor lamination as claimed in claim 1, wherein the included angle between the two second magnet slots on both sides of each first magnet slot is α, and π / p < α < 2π / p, where p is the number of motor pole pairs.

3. The rotor lamination as claimed in claim 1, wherein among the plurality of second magnet slots located on the same side of the plurality of first magnet slots, the second magnet slots closer to the shaft hole have a greater thickness.

4. The rotor lamination as claimed in claim 1, wherein the magnetic pole portion includes a third magnetic slot for receiving a magnet, the third magnetic slot being located radially along the rotor lamination on the side opposite to the shaft hole of the plurality of first magnetic slots.

5. The rotor lamination as described in claim 4, wherein the third magnet slot is strip-shaped and arranged parallel to the first magnet slot; or, the third magnet slot includes two first sub-magnet slots arranged in a V-shape, and the included angle between the two first sub-magnet slots is β, where 2π / p < β < π, and p is the number of motor pole pairs; or, the third magnet slot is arc-shaped, and the arc of the third magnet slot is β, where 2π / p < β < π, and p is the number of motor pole pairs.

6. The rotor lamination as claimed in claim 4, wherein the magnetic pole portion includes a fourth magnetic slot for accommodating a magnet, the fourth magnetic slot being located between the third magnetic slot and the plurality of first magnetic slots, the number of the fourth magnetic slot being one, and the fourth magnetic slot being U-shaped; or, the number of the fourth magnetic slot being two, and the two fourth magnetic slots being arranged in a V-shape.

7. The rotor lamination as claimed in claim 1, wherein the thicknesses of each of the plurality of first magnet slots in the direction from the shaft hole toward the outer edge of the rotor lamination are H1, H2, H3…, and H1:H2:H3:…=2Hmin:5 / 3Hmin:4 / 3Hmin:….

8. The rotor lamination as claimed in any one of claims 1 to 7, wherein a reinforcing rib is provided between each of the first magnet slots and each of the second magnet slots, the reinforcing rib being used to improve the strength of the rotor lamination.

9. The rotor lamination as claimed in claim 8, wherein the minimum width of the reinforcing rib gradually increases from the outer edge of the rotor lamination toward the shaft hole.

10. The rotor lamination as claimed in claim 9, wherein, in the direction from the shaft hole toward the outer edge of the rotor lamination, the minimum widths of each of the plurality of reinforcing ribs are W1, W2, W3..., respectively, and 4 / 3 < W1 / W2 < 2, 11 / 10 < W2 / W3 < 6 / 5.

11. The rotor lamination as claimed in any one of claims 1 to 7, wherein a portion of the first magnet slot includes two second sub-magnet slots arranged in a V-shape, and the included angle between the two second sub-magnet slots is γ, where 2π / p < γ < π, and p is the number of motor pole pairs.

12. The rotor lamination as claimed in any one of claims 1 to 7, wherein the rotor lamination is provided with a weight-reducing hole extending along its own axial direction, the weight-reducing hole being located on the side of the plurality of first magnet slots opposite to the shaft hole.

13. A rotor comprising a plurality of said magnets and rotor laminations as claimed in claim 1.

14. A motor comprising a stator and rotor laminations as claimed in claim 1, or comprising a rotor as claimed in claim 13, the stator surrounding the periphery of the rotor laminations.

15. A vehicle comprising a body and a motor as described in claim 14, the motor being fixed to the body.

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