Rotor lamination and permanent magnet motor

Abstract

The application provides a rotor lamination and a permanent magnet motor. The rotor lamination is provided with an axle hole, the axle hole is arranged at the center of the rotor lamination and penetrates the rotor lamination, a plurality of magnet grooves, each of the magnet grooves penetrates the rotor lamination and is arranged along the circumference of the rotor lamination, for any one of the magnet grooves, the magnet groove comprises a first groove section and a second groove section, the extension directions of the first groove section and the second groove section are different, and one or more magnetic separation holes, for any one of the magnetic separation holes, the magnetic separation hole is arranged between the axle hole and one of the magnet grooves, a preset axis penetrates the magnetic separation hole, the preset axis is located between the first groove section and the second groove section of the magnet groove, the preset axis penetrates the center of the axle hole, and the maximum length of the magnetic separation hole along the radial direction of the rotor lamination is greater than the maximum length of the magnetic separation hole along the tangential direction of the rotor lamination. The rotor lamination solves the technical problem that the efficiency of the permanent magnet motor in the related art is difficult to be further improved.

Description

Technical Field

[0001] This invention relates to the field of electric motors, and more specifically, to a rotor lamination and permanent magnet motor. Background Technology

[0002] Permanent magnet motors have advantages such as simple structure, low cost, high reliability, small size, and light weight, and are currently widely used in modern industrial production and daily life. Further improving the efficiency of permanent magnet motors, thereby reducing energy consumption and heat generation, is an important direction for designers in this field.

[0003] In the field of related technologies, the efficiency of permanent magnet motors has reached a bottleneck and is difficult to improve further by optimizing various parameters based on the existing structure. There is currently no effective solution to this technical problem. Summary of the Invention

[0004] The main objective of this invention is to provide a rotor lamination and a permanent magnet motor to solve the technical problem that the efficiency of permanent magnet motors in related technologies is difficult to further improve.

[0005] To achieve the above objectives, according to one aspect of the present invention, a rotor lamination is provided, comprising: a shaft hole disposed at the center of the rotor lamination and penetrating the rotor lamination; a plurality of magnet slots, each magnet slot penetrating the rotor lamination and spaced sequentially along the circumference of the rotor lamination; each magnet slot including a first slot segment and a second slot segment, the first slot segment and the second slot segment having different extension directions; and one or more magnetic isolation holes, wherein each magnetic isolation hole is disposed between the shaft hole and a magnet slot, and a preset axis passes through the magnetic isolation hole, the preset axis being located between the first slot segment and the second slot segment of the magnet slot, the preset axis passing through the center of the shaft hole, and the maximum length of the magnetic isolation hole along the radial direction of the rotor lamination being greater than the maximum length of the magnetic isolation hole along the tangential direction of the rotor lamination.

[0006] Furthermore, there are multiple magnetic isolation holes, and each of the multiple magnetic isolation holes corresponds to a multiple magnet slot.

[0007] Furthermore, for any magnetic isolation hole, it is symmetrically arranged with respect to a preset axis; for the magnet slot corresponding to the magnetic isolation hole, its first slot segment and second slot segment are symmetrically arranged with respect to the preset axis.

[0008] Furthermore, for any magnetic isolation hole, it satisfies 0.3≤S1 / (L2*L3)≤1, where S1 is the area of ​​the magnetic isolation hole, L2 is the maximum length of the magnetic isolation hole along the radial direction of the rotor lamination, and L3 is the maximum length of the magnetic isolation hole along the tangential direction of the rotor lamination.

[0009] Furthermore, for any magnetic isolation hole, the distance L5 between it and the corresponding magnet slot satisfies 0.4mm≤L5≤1.5mm.

[0010] Furthermore, the rotor lamination structure satisfies 3.5mm≤L1-R1≤9mm, where L1 is the minimum distance between the center of any magnetic isolation hole and the shaft hole, and R1 is the radius of the shaft hole.

[0011] Furthermore, along the tangent of the rotor lamination, the maximum length of the magnet slot is L4, and along the tangent of the rotor lamination, the maximum length of the magnetic isolation hole is L3, where 0.1≤L3 / L4≤0.5.

[0012] Furthermore, the magnetic shielding hole can be rectangular, trapezoidal, arc-shaped, or irregular in shape.

[0013] Furthermore, for any magnet slot, the first slot segment is connected to the second slot segment, and the connection between the first slot segment and the second slot segment protrudes towards the shaft hole.

[0014] Furthermore, for any magnetically shielding hole, its area S1 satisfies 10 mm². 2 ≤S1≤40mm 2 The radius R1 of the shaft hole satisfies 6mm≤R1≤9mm.

[0015] According to another aspect of the present invention, a permanent magnet motor is provided, wherein the rotor core of the permanent magnet motor includes a plurality of rotor laminations stacked sequentially, wherein the rotor laminations are those described above.

[0016] The rotor lamination of this invention includes: a shaft hole located at the center of the rotor lamination and penetrating the rotor lamination; multiple magnet slots penetrating the rotor lamination and spaced apart sequentially along the circumference of the rotor lamination; each magnet slot includes a first slot segment and a second slot segment, the first and second slot segments having different extension directions; and one or more magnetic isolation holes, wherein each magnetic isolation hole is located between the shaft hole and a magnet slot, and a preset axis passes through the magnetic isolation hole. The preset axis is located between the first and second slot segments of the magnet slot and passes through the center of the shaft hole. The maximum length of the magnetic isolation hole along the radial direction of the rotor lamination is greater than the maximum length of the magnetic isolation hole along the tangential direction of the rotor lamination. The rotor lamination with this structural design incorporates a magnetic isolation hole between the magnet slot and the shaft hole. The length of this hole along the radial direction of the rotor lamination is greater than its tangential length. This design saturates the magnetic flux between the magnetic isolation hole and the magnet slot, making it difficult for magnetic lines of force to pass through. This effectively separates the magnetic field between the first and second segments of the same magnet slot, reduces magnetic leakage between the two magnets within the same slot, and prevents the circumferential diffusion of magnetic lines of force between adjacent magnetic poles. This results in a more compact and uniform distribution of magnetic lines of force between adjacent magnetic poles, which helps to increase the back electromotive force of the permanent magnet motor, thereby reducing motor losses, improving motor efficiency, and solving the technical problem of further improving the efficiency of permanent magnet motors in related technologies. Attached Figure Description

[0017] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0018] Figure 1 This is a schematic diagram of the structure of the first embodiment of the rotor lamination of the present invention;

[0019] Figure 2 This is a schematic diagram of the structure of a second embodiment of the rotor lamination of the present invention;

[0020] Figure 3 This is a schematic diagram of the structure of the third embodiment of the rotor lamination of the present invention;

[0021] Figure 4 This is a schematic diagram of the fourth embodiment of the rotor lamination of the present invention;

[0022] Figure 5 This is a schematic diagram of the fifth embodiment of the rotor lamination of the present invention;

[0023] Figure 6 This is a schematic diagram of the rotor lamination structure in related technologies;

[0024] Figure 7This is a schematic diagram showing the average magnetic flux density of a permanent magnet motor using the rotor laminations of the present invention and a permanent magnet motor in related technologies.

[0025] The above figures include the following reference numerals:

[0026] 1. Shaft hole; 2. Magnet slot; 21. First slot section; 22. Second slot section; 3. Magnetic isolation hole; 4. Heat dissipation hole. Detailed Implementation

[0027] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0028] Please refer to Figures 1 to 7 To achieve the above objectives, embodiments of the present invention provide a rotor lamination, which includes: a shaft hole 1 located at the center of the rotor lamination and penetrating the rotor lamination; multiple magnet slots 2 penetrating the rotor lamination and spaced apart sequentially along the circumference of the rotor lamination; each magnet slot 2 includes a first slot segment 21 and a second slot segment 22, the first slot segment 21 and the second slot segment 22 having different extension directions; and one or more magnetic isolation holes 3, wherein each magnetic isolation hole 3 is located between the shaft hole 1 and a magnet slot 2, and a preset axis passes through the magnetic isolation hole 3. The preset axis is located between the first slot segment 21 and the second slot segment 22 of the magnet slot 2 (the magnet slot 2 corresponding to the magnetic isolation hole 3), and the preset axis passes through the center of the shaft hole 1. The maximum length of the magnetic isolation hole 3 along the radial direction of the rotor lamination is greater than the maximum length of the magnetic isolation hole 3 along the tangential direction of the rotor lamination.

[0029] The rotor lamination with this structural design incorporates a magnetic isolation hole 3 between the magnet slot 2 and the shaft hole 1. The length of the magnetic isolation hole 3 along the radial direction of the rotor lamination is greater than its tangential length. This saturates the magnetic flux between the magnetic isolation hole 3 and the magnet slot 2, making it difficult for magnetic lines of force to pass through. This better separates the magnetic field between the first slot segment 21 and the second slot segment 22 of the same magnet slot 2, reduces magnetic leakage between the two magnets in the same magnet slot 2, and blocks the circumferential diffusion of magnetic lines of force between adjacent magnetic poles. This results in a more compact and uniform distribution of magnetic lines of force between adjacent magnetic poles, which helps to increase the back electromotive force of the permanent magnet motor, thereby reducing motor losses, improving motor efficiency, and solving the technical problem of further improving the efficiency of permanent magnet motors in related technologies.

[0030] In addition, the design of the magnetic isolation hole 3 is also conducive to enhancing the heat dissipation of the rotor laminations and the magnets installed therein, thereby suppressing the decrease in coercivity caused by temperature rise, improving the magnets' resistance to demagnetization, and ensuring motor performance.

[0031] Figure 6The diagram shows the structure of a rotor lamination in the related art. It can be seen that although the rotor lamination in the related art has heat dissipation holes 4, its structure is not the same as the magnetic isolation holes 3 in the embodiment of this invention. The heat dissipation holes 4 have a tangential length greater than their radial length along the rotor lamination. Therefore, they cannot separate the magnetic field between the first slot segment 21 and the second slot segment 22 of the same magnet slot 2, cannot reduce magnetic leakage between the two magnets in the same magnet slot 2, and cannot block the circumferential diffusion of magnetic field lines between adjacent magnetic poles, resulting in severe magnetic leakage. In contrast, the magnetic isolation holes 3 in the rotor lamination of this embodiment have a radial length greater than their tangential length, effectively separating the magnetic field between the first slot segment 21 and the second slot segment 22 of the same magnet slot 2, reducing magnetic leakage between the two magnets in the same magnet slot 2, and blocking the circumferential diffusion of magnetic field lines between adjacent magnetic poles. This results in a more compact and uniform distribution of magnetic field lines between adjacent magnetic poles, which is beneficial for increasing the back electromotive force of the permanent magnet motor, thereby reducing motor losses and improving motor efficiency.

[0032] It should be noted that the first slot segment 21 and the second slot segment 22 mentioned above are both classified into the same magnet slot 2. In specific implementation, for a magnet slot 2, the first slot segment 21 and the second slot segment 22 can be integrated, that is, they are interconnected, or they can be separate, that is, the first slot segment 21 and the second slot segment 22 are set at a certain distance. During the motor manufacturing process, magnets are inserted into the first slot segment 21 and the second slot segment 22 respectively.

[0033] The difference in the extension direction of the first groove segment 21 and the second groove segment 22 mentioned above means that there is a difference in the extension direction of the first groove segment 21 and the second groove segment 22. As long as the extension directions of the two are not completely consistent, the difference can be understood as above. There can be areas where the extension directions of the two are consistent.

[0034] In practical implementation, when there are multiple magnetic isolation holes 3, to better ensure the uniformity of magnetic flux density distribution, the multiple magnetic isolation holes 3 are evenly spaced along the circumference of the rotor laminations. Specifically, the number of magnetic isolation holes 3 can be the same as the number of magnet slots 2, for example... Figures 1 to 4 The number of magnetic isolation holes 3 may also be different from the number of magnet slots 2, for example... Figure 5 Examples of implementations.

[0035] In a preferred embodiment, there are multiple magnetic isolation holes 3, each corresponding one-to-one with a number of magnet slots 2. By designing multiple magnetic isolation holes 3, and ensuring that each hole corresponds to an equal number of magnet slots 2, the magnetic field between the two magnets in each magnet slot 2 can be isolated through the multiple magnetic isolation holes 3. This prevents the circumferential diffusion of magnetic field lines between adjacent magnetic poles, resulting in a more compact and uniform distribution of magnetic field lines between adjacent poles. This allows the magnetic field lines to penetrate the rotor more fully, reducing magnetic leakage and thus significantly improving the efficiency of the permanent magnet motor. Furthermore, the one-to-one correspondence between multiple magnetic isolation holes 3 and multiple magnet slots 2 also contributes to a more uniform distribution of magnetic field lines, optimizing motor performance. In addition, the dynamic balance of the rotor can be better controlled.

[0036] For any one magnetic isolation hole 3, it is symmetrically arranged with respect to a preset axis; for the magnet groove 2 corresponding to the magnetic isolation hole 3, its first groove segment 21 and second groove segment 22 are symmetrically arranged with respect to a preset axis.

[0037] In this embodiment, the first slot segment 21 and the second slot segment 22 of the same magnet slot 2 are symmetrical with respect to a preset axis, and the corresponding magnetic isolation hole 3 is also symmetrical with respect to the preset axis. This makes the magnetic field distribution on both sides of the magnetic isolation hole 3 more uniform and improves the magnetic flux density of the permanent magnet motor. Of course, in other optional embodiments, the positional relationship between these structures can also be staggered.

[0038] The magnetic isolation hole 3, the preset axis and the magnet groove 2 mentioned here are all in a corresponding relationship. That is, the preset axis passes through the magnetic isolation hole 3 and is located between the first groove segment 21 and the second groove segment 22 of the magnet groove 2. The three correspond to each other, and the magnetic isolation hole 3 and the magnet groove 2 are symmetrically arranged with respect to the preset axis.

[0039] In this embodiment, for any magnetic isolation hole 3, it satisfies 0.3≤S1 / (L2*L3)≤1, where S1 is the area of ​​the magnetic isolation hole 3, L2 is the maximum radial length of the magnetic isolation hole 3 along the rotor lamination, and L3 is the maximum tangential length of the magnetic isolation hole 3 along the rotor lamination. In this embodiment, the structure of the rotor lamination also satisfies 0.3≤S1 / (L2*L3)≤1. By controlling the area of ​​each magnetic isolation hole 3 on the rotor lamination, the situation where the magnetic isolation hole 3 is too large, leading to insufficient rigidity of the rotor lamination, can be avoided, while the situation where the magnetic isolation hole 3 is too small, leading to insignificant improvement in magnetic flux density, can also be avoided. Practice has proven that within this range of S1 / (L2*L3), the magnetic isolation hole 3 has a significant effect on improving magnetic flux density under the premise of meeting process requirements, and can effectively improve the efficiency of the permanent magnet motor.

[0040] Preferably, for any magnetic isolation hole 3, the distance L5 between it and the corresponding magnet slot 2 satisfies 0.4mm≤L5≤1.5mm.

[0041] By designing the distance L5 between the magnetic isolation hole 3 and the adjacent magnet slot 2, the magnetic isolation effect of the magnetic isolation hole 3 was optimized. Specifically, if L5 is designed to be too large, the magnetic flux in the area between the magnetic isolation hole 3 and the magnet slot 2 will be unsaturated, resulting in magnetic leakage. If L5 is designed to be too small, it will increase the processing difficulty and make the structural strength between the magnetic isolation hole 3 and the magnet slot 2 too low, thereby increasing the risk of breakage in this part. Practice has proven that within this range, L5 can effectively reduce the magnetic leakage between two magnets under the same magnetic pole and improve the efficiency of the permanent magnet motor while ensuring the reliability of the rotor lamination structure.

[0042] As a preferred embodiment, the rotor lamination structure satisfies 3.5mm≤L1-R1≤9mm, where L1 is the minimum distance between the center of any magnetic isolation hole 3 and the shaft hole 1, and R1 is the radius of the shaft hole 1.

[0043] In this embodiment, the value of L1-R1 is further controlled so that 3.5mm≤L1-R1≤9mm. This range is an indirect limitation on the radial length of the magnetic isolation hole 3. If the value is too large, it will not only cause waste but also increase the processing difficulty and make it difficult to meet the rigidity requirements. If the value is too small, the magnetic lines of force will pass through the lower end of the magnetic isolation hole 3 (i.e., between the magnetic isolation hole 3 and the shaft hole 1), thus making the improvement of magnetic density insignificant. Practice has proven that within this range, L1-R1 can, while ensuring the structural strength of the rotor lamination, enable the magnetic isolation hole 3 to better block the passage of magnetic lines of force between adjacent magnetic poles, thereby making the magnetic density distribution more uneven.

[0044] Along the tangent of the rotor lamination, the maximum length of the magnet slot 2 is L4, and along the tangent of the rotor lamination, the maximum length of the magnetic isolation hole 3 is L3, where 0.1 ≤ L3 / L4 ≤ 0.5. Figures 1 to 5 As shown, L3 is the maximum length of the magnetic isolation hole 3 along the tangential direction of the rotor lamination, and L4 is the maximum length of the magnet slot 2 along the tangential direction of the rotor lamination. Figures 1 to 5 In the embodiments described, L4 can also be interpreted as the maximum straight-line distance between the two ends of the magnet slot 2.

[0045] In this embodiment, the width of the magnetic isolation hole 3 on the rotor lamination was further optimized so that 0.1≤L3 / L4≤0.5. This range limits the maximum width of the magnetic isolation hole 3 in the circumferential direction (along the tangential direction of the rotor lamination). Specifically, if L3 / L4 is designed to be too small, the magnetic lines of force will easily expand outward in the circumferential direction, making the improvement effect on magnetic flux density insignificant; if L3 / L4 is designed to be too large, the length of the magnetic isolation hole 3 in the circumferential direction will be too long. In practice, it has been found that this will also affect the magnetic flux density distribution between adjacent magnetic poles and may cause interference between other hole structures.

[0046] like Figures 1 to 4As shown, the magnetic isolation hole 3 can be selected in various shapes during actual implementation, such as rectangular, trapezoidal arc and other regular or irregular shapes. As long as it meets the above requirements of being between the magnet slot 2 and the shaft hole 1, and the length of the magnetic isolation hole 3 along the radial direction of the rotor lamination is greater than the length along the tangential direction, it can achieve the magnetic isolation effect, thereby improving the magnetic flux density distribution of the permanent magnet motor and increasing the efficiency of the permanent magnet motor.

[0047] Preferably, the width of the magnetic isolation hole 3 gradually decreases along the radial outward direction of the rotor lamination. The width of the magnetic isolation hole 3 is its size along the tangential direction of the rotor lamination. This can better match the magnetic field distribution generated by the magnet in the magnet slot 2 and improve the magnetic density effect.

[0048] In this embodiment, for any magnet slot 2, the first slot segment 21 and the second slot segment 22 are connected, and the connection between the first slot segment 21 and the second slot segment 22 protrudes toward the shaft hole 1.

[0049] In this embodiment, the magnet groove 2 is a V-shaped groove. The first groove segment 21 and the second groove segment 22 of the magnet groove 2 are connected, and the groove structure at their connection point protrudes towards the shaft hole. In related technologies, a recess is usually designed at the end of the magnet groove 2 (e.g., Figure 6 As shown in the figure, by designing the connection between the two slot sections as a protruding structure, this application reduces the distance between the magnet slot 2 and the magnetic isolation hole 3, which is beneficial to further reduce magnetic leakage and improve motor efficiency.

[0050] Specifically, for any magnetic isolation hole 3, its area S1 satisfies 10mm². 2 ≤S1≤40mm 2 The radius R1 of the shaft hole 1 satisfies 6mm≤R1≤9mm.

[0051] Finally, embodiments of the present invention also provide a permanent magnet motor, the permanent magnet motor including a rotor core, the rotor core including a plurality of rotor laminations stacked sequentially, wherein the rotor laminations are the rotor laminations described above.

[0052] Figure 7 This is a schematic diagram showing the average magnetic flux density of a permanent magnet motor using the rotor laminations of the present invention and permanent magnet motors in related technologies, as shown below. Figure 7 As shown, the original scheme is a permanent magnet motor in the related technology, and the new schemes 1 to 5 are permanent magnet motors using the rotor laminations of the present invention. The difference between the different new schemes is that the number and position of the selected magnetic isolation holes 3 are different. It can be seen that the average magnetic flux density of the permanent magnet motor using the rotor laminations of the present invention is higher than that of the original scheme in the related technology, indicating that the motor leakage is smaller. Therefore, its magnetic field lines will be more concentrated and uniform, and the motor efficiency will also be higher than that of the scheme in the related technology.

[0053] As can be seen from the above description, the embodiments of the present invention achieve the following technical effects:

[0054] The rotor lamination of this embodiment of the invention is provided with: a shaft hole 1, which is located at the center of the rotor lamination and passes through the rotor lamination; a plurality of magnet slots 2, each of which passes through the rotor lamination and is arranged at intervals along the circumference of the rotor lamination; for any magnet slot 2, there are a first slot segment 21 and a second slot segment 22, the first slot segment 21 and the second slot segment 22 have different extension directions; and one or more magnetic isolation holes 3, wherein for any magnetic isolation hole 3, it is located between the shaft hole 1 and a magnet slot 2, and a preset axis passes through the magnetic isolation hole 3. The preset axis is located between the first slot segment 21 and the second slot segment 22 of the magnet slot 2 and passes through the center of the shaft hole 1. The maximum length of the magnetic isolation hole 3 along the radial direction of the rotor lamination is greater than the maximum length of the magnetic isolation hole 3 along the tangential direction of the rotor lamination. The rotor lamination with this structural design incorporates a magnetic isolation hole 3 between the magnet slot 2 and the shaft hole 1. The length of the magnetic isolation hole 3 along the radial direction of the rotor lamination is greater than its tangential length. This saturates the magnetic flux between the magnetic isolation hole 3 and the magnet slot 2, making it difficult for magnetic lines of force to pass through. This better separates the magnetic field between the first slot segment 21 and the second slot segment 22 of the same magnet slot 2, reduces magnetic leakage between the two magnets in the same magnet slot 2, and blocks the circumferential diffusion of magnetic lines of force between adjacent magnetic poles. This results in a more compact and uniform distribution of magnetic lines of force between adjacent magnetic poles, which helps to increase the back electromotive force of the permanent magnet motor, thereby reducing motor losses, improving motor efficiency, and solving the technical problem of further improving the efficiency of permanent magnet motors in related technologies.

[0055] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0056] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0057] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented, for example, in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0058] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A rotor lamination, characterized in that, The rotor lamination is provided with: Shaft hole (1), the shaft hole (1) is provided at the center of the rotor lamination, the shaft hole (1) is provided through the rotor lamination; Multiple magnet slots (2) are provided, each of which penetrates the rotor lamination. The multiple magnet slots (2) are arranged sequentially at intervals along the circumference of the rotor lamination. Each magnet slot (2) includes a first slot segment (21) and a second slot segment (22), and the first slot segment (21) and the second slot segment (22) extend in different directions. One or more magnetic isolation holes (3), wherein, for any one of the magnetic isolation holes (3), it is disposed between the shaft hole (1) and a magnet slot (2), and a preset axis passes through the magnetic isolation hole (3), the preset axis is located between the first slot segment (21) and the second slot segment (22) of the magnet slot (2), the preset axis passes through the center of the shaft hole (1), and the maximum length of the magnetic isolation hole (3) along the radial direction of the rotor lamination is greater than the maximum length of the magnetic isolation hole (3) along the tangential direction of the rotor lamination.

2. The rotor lamination according to claim 1, characterized in that, There are multiple magnetic isolation holes (3), and each of the multiple magnetic isolation holes (3) corresponds to one of the multiple magnetic slots (2).

3. The rotor lamination according to claim 1, characterized in that, For any one of the magnetic isolation holes (3), it satisfies 0.3≤S1 / (L2*L3)≤1, where S1 is the area of ​​the magnetic isolation hole (3), L2 is the maximum length of the magnetic isolation hole (3) along the radial direction of the rotor lamination, and L3 is the maximum length of the magnetic isolation hole (3) along the tangential direction of the rotor lamination.

4. The rotor lamination according to claim 1, characterized in that, For any one of the magnetic isolation holes (3), the distance L5 between it and the corresponding magnetic groove (2) satisfies 0.4mm≤L5≤1.5mm.

5. The rotor lamination according to claim 1, characterized in that, The rotor lamination structure satisfies 3.5mm≤L1-R1≤9mm, where L1 is the minimum distance between the center of any of the magnetic isolation holes (3) and the center of the shaft hole (1), and R1 is the radius of the shaft hole (1).

6. The rotor lamination according to claim 1, characterized in that, Along the tangent of the rotor lamination, the maximum length of the magnet slot (2) is L4, and along the tangent of the rotor lamination, the maximum length of the magnetic isolation hole (3) is L3, wherein 0.1≤L3 / L4≤0.

5.

7. The rotor lamination according to any one of claims 1 to 6, characterized in that, The magnetic shielding hole (3) is rectangular, trapezoidal, arc-shaped or irregular in shape.

8. The rotor lamination according to any one of claims 1 to 6, characterized in that, For any one of the magnet slots (2), the first slot segment (21) is connected to the second slot segment (22), and the connection between the first slot segment (21) and the second slot segment (22) protrudes toward the shaft hole (1).

9. The rotor lamination according to any one of claims 1 to 6, characterized in that, For any one of the magnetic isolation holes (3), its area S1 satisfies 10 mm. 2 ≤S1≤40mm 2 The radius R1 of the shaft hole (1) satisfies 6mm≤R1≤9mm.

10. A permanent magnet motor, characterized in that, The rotor core of the permanent magnet motor includes a plurality of rotor laminations stacked sequentially, wherein the rotor laminations are the rotor laminations according to any one of claims 1 to 9.

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