Rotor laminations and motor

Abstract

This application provides a rotor lamination and a motor. The rotor lamination includes a ring-shaped rotor core with multiple mounting slots arranged sequentially around the center point of the ring structure. Each mounting slot contains a magnet. The rotor core also includes: a first magnetic isolation bridge, adjacent to the end of the magnet closest to the center point and closer to the center point than the magnet; a second magnetic isolation bridge, located between adjacent magnets; and a third magnetic isolation bridge, adjacent to the end of the second magnetic isolation bridge closest to the center point and closer to the center point than the second magnetic isolation bridge. A support rib is provided between the third and second magnetic isolation bridges. The support rib can improve the strength of the parts in the area where the magnetic isolation bridges are located, preventing the area from being too soft and causing deformation and damage.

Description

Technical Field

[0001] This application relates to the field of motor technology, specifically to a rotor lamination and a motor having the rotor lamination. Background Technology

[0002] The design of rotor laminations is crucial for optimizing magnetic field distribution and improving motor performance. Generally, rotor laminations consist of a rotor core and multiple magnets mounted on it. The rotor core is typically made of silicon steel sheets with high permeability, used to concentrate and guide the magnetic field, optimize the magnetic field path, and reduce magnetic reluctance and leakage flux. The magnets, or permanent magnets, provide a constant magnetic field. Furthermore, the rotor core usually has magnetic bridges composed of air slots, which optimize the magnetic field distribution and reduce leakage flux and eddy current losses by interrupting unnecessary magnetic flux paths. However, the presence of these magnetic bridges reduces the continuity of the rotor laminations, weakens the overall mechanical strength, and makes the laminations prone to deformation near the magnetic bridges, which is detrimental to lamination stacking. Especially during high-speed motor rotation, centrifugal force can cause deformation or even damage to the rotor structure near the magnetic bridges. Utility Model Content

[0003] In view of this, this application provides a rotor lamination and a motor provided with the rotor lamination, which can improve the strength of the parts in the area where the magnetic bridge is located and avoid the area from being too soft, resulting in deformation and damage.

[0004] To achieve the above objectives, this application provides the following technical solution:

[0005] A rotor lamination includes a rotor core with an annular structure. The rotor core is provided with a plurality of mounting slots arranged sequentially around the center point of the annular structure, and a magnet is provided in each mounting slot.

[0006] The rotor core is also provided with:

[0007] The first magnetic isolation bridge is adjacent to the end of the magnet that is closer to the center point, and is closer to the center point than the magnet.

[0008] The second magnetic isolation bridge is located between adjacent magnets;

[0009] The third magnetic isolation bridge is adjacent to the end of the second magnetic isolation bridge near the center point, and is closer to the center point than the second magnetic isolation bridge; a supporting rib is provided between the third magnetic isolation bridge and the second magnetic isolation bridge.

[0010] Optionally, in the above-mentioned rotor laminations, the support ribs are formed by a portion of the rotor core.

[0011] Optionally, in the above-mentioned rotor lamination, a first through hole communicating with the mounting groove is provided on the side of the mounting groove;

[0012] The first through hole is further away from the center point than the end of the magnet that is closer to the center point;

[0013] The first through hole is closer to the center point than the end of the magnet that is furthest from the center point.

[0014] Optionally, in the above-mentioned rotor lamination, the first through hole is an arc shape that is recessed in a direction away from the mounting groove.

[0015] Optionally, in the above-mentioned rotor laminations, the rotor core is further provided with:

[0016] The second through hole is located between adjacent mounting slots;

[0017] And / or, auxiliary slots, located on the radially outer side of the rotor core;

[0018] And / or, a limiting boss is located on the radially outer side of the rotor core and engages with the magnet for limiting.

[0019] Optionally, in the above-mentioned rotor laminations, the spacing between the first magnetic isolation bridge and the third magnetic isolation bridge is greater than zero;

[0020] And / or, the distance between the magnet and the second magnetic bridge is greater than zero.

[0021] Optionally, in the above-mentioned rotor laminations, the rotor core is an integral structural component.

[0022] Optionally, in the above-mentioned rotor laminations, multiple first magnetic isolation bridges are arranged sequentially around the center point, and the multiple first magnetic isolation bridges correspond one-to-one with the multiple magnets;

[0023] And / or, multiple second magnetic isolation bridges are arranged sequentially around the center point, with the multiple second magnetic isolation bridges and multiple magnets arranged at intervals;

[0024] And / or, multiple third magnetic isolation bridges are arranged sequentially around the center point, and each of the multiple third magnetic isolation bridges corresponds one-to-one with a multiple of the second magnetic isolation bridges.

[0025] Optionally, in the above rotor laminations, the average spacing d between adjacent magnets and the magnetization thickness c of the magnets satisfy 1 / 4≤c / d≤3 / 4;

[0026] And / or, the length e of the magnet in the radial direction of the rotor lamination and the magnetization thickness c of the magnet satisfy zero < c / e ≤ 1 / 3;

[0027] And / or, the distance between the inner annular side of the rotor core and the center point is less than the distance between the side of the first magnetic bridge closest to the center point and the center point;

[0028] And / or, the length of the side of the first magnetic bridge closer to the magnet is greater than the length of the side of the first magnetic bridge farther from the magnet;

[0029] And / or, the length of the side of the first magnetic bridge away from the magnet is less than the magnetization thickness of the magnet;

[0030] And / or, the distance between the side of the third magnetic bridge closest to the center point and the center point is greater than the distance between the side of the first magnetic bridge closest to the center point and the center point;

[0031] And / or, the length of the side of the third magnetic bridge closer to the second magnetic bridge is greater than the length of the side of the third magnetic bridge farther from the second magnetic bridge;

[0032] And / or, the opening shape of the second magnetic isolation bridge is triangular, and its side near the third magnetic isolation bridge is parallel and of the same length as the side of the third magnetic isolation bridge near the second magnetic isolation bridge.

[0033] An electric motor having the rotor laminations described above.

[0034] The rotor laminations and motor provided in this application not only have a first magnetic isolation bridge located near the center point of the rotor laminations on the magnets, but also a second and a third magnetic isolation bridge between adjacent magnets. Furthermore, by setting support ribs between the second and third magnetic isolation bridges, the area covered by the magnetic isolation bridges is strengthened. That is, the support ribs can improve the strength of the parts covered by the second and third magnetic isolation bridges, thereby ensuring the overall mechanical strength of the rotor core. This avoids the rotor core from becoming too soft or even deformed in the large magnetic isolation bridge covered area (i.e., the area where the second and third magnetic isolation bridges are located), which would be detrimental to the rotor lamination stacking process. Moreover, it helps to reduce the risk of deformation or even damage to the rotor structure near the magnetic isolation bridges due to centrifugal force when the motor rotates at high speed. Attached Figure Description

[0035] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this application. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0036] Figure 1This is a schematic diagram of the structure of a rotor lamination provided in an embodiment of this application.

[0037] Figure 2 for Figure 1 A magnified view of a portion of the image.

[0038] Figure 3 This is a schematic diagram showing the dimensions of a rotor lamination provided in an embodiment of this application.

[0039] in:

[0040] 1-Magnet, 2-Rotor core, 21-First through hole, 22-Second through hole, 23-Auxiliary slot,

[0041] 24-Support rib, 25-Limiting boss, 201-First magnetic isolation bridge, 202-Second magnetic isolation bridge

[0042] 203 - Third magnetic isolation bridge. Detailed Implementation

[0043] This application provides a rotor lamination and a motor equipped with the rotor lamination, which can improve the strength of the parts in the area where the magnetic bridge is located and prevent the area from being too soft, thus avoiding deformation and damage.

[0044] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0045] Please see Figure 1 and Figure 2The rotor lamination provided in this embodiment includes a rotor core 2 with an annular structure. The rotor core 2 has multiple mounting slots arranged sequentially around the center point Q of the annular structure, and each mounting slot contains a magnet 1 (i.e., a permanent magnet). Furthermore, the rotor core 2 also includes a first magnetic isolation bridge 201, a second magnetic isolation bridge 202, and a third magnetic isolation bridge 203. Specifically: the first magnetic isolation bridge 201 is adjacent to the end of the magnet 1 closest to the center point Q and is closer to the center point Q than the magnet 1; the second magnetic isolation bridge 202 is located between adjacent magnets 1; the third magnetic isolation bridge 203 is adjacent to the end of the second magnetic isolation bridge 202 closest to the center point Q and is closer to the center point Q than the second magnetic isolation bridge 202; and a supporting rib 24 is provided between the third magnetic isolation bridge 203 and the second magnetic isolation bridge 202, meaning that the third magnetic isolation bridge 203 and the second magnetic isolation bridge 202 are separated by the supporting rib 24. It should be noted that the two ends of the support rib 24 are respectively connected to the rotor core 2 near the magnetic isolation bridge (mainly referring to the rotor core 2 in the area between the third magnetic isolation bridge 203 / second magnetic isolation bridge 202 and the magnet 1). Furthermore, the radial width of the support rib 24 in the rotor lamination is also the spacing between the third magnetic isolation bridge 203 and the second magnetic isolation bridge 202. For details, please refer to... Figure 3 The distance j > zero.

[0046] As can be seen, in the rotor lamination provided in this application embodiment, not only is a first magnetic isolation bridge 201 provided at the position of the magnet 1 near the center point Q of the rotor lamination, but a second magnetic isolation bridge 202 and a third magnetic isolation bridge 203 are also provided between adjacent magnets 1. Furthermore, by providing support ribs 24 between the second magnetic isolation bridge 202 and the third magnetic isolation bridge 203, the area covered by the magnetic isolation bridge is strengthened. That is, the support ribs 24 can improve the strength of the parts in the area covered by the second magnetic isolation bridge 202 and the third magnetic isolation bridge 203, thereby ensuring the overall mechanical strength of the rotor core 2. This avoids the rotor core 2 from being too soft or even deformed in the large area covered by the magnetic isolation bridge (i.e., the area where the second magnetic isolation bridge 202 and the third magnetic isolation bridge 203 are located), which would be detrimental to the rotor lamination stacking process. Moreover, it helps to reduce the risk of deformation or even damage to the rotor structure near the magnetic isolation bridge due to the centrifugal force when the motor rotates at high speed.

[0047] In some embodiments, the first magnetic isolation bridge 201 includes a first air gap formed on the rotor core 2; and / or, the second magnetic isolation bridge 202 includes a second air gap formed on the rotor core 2; and / or, the third magnetic isolation bridge 203 includes a third air gap formed on the rotor core 2. It should be noted that the "air gap" mentioned in this application refers to an "air groove" or "air through hole," used to isolate the magnetic field of the magnet itself from closing and reduce magnetic leakage. However, it is not limited to this; in other embodiments, other non-magnetic materials can also be used as magnetic isolation bridges. For example, the areas where the first magnetic isolation bridge 201, the second magnetic isolation bridge 202, and the third magnetic isolation bridge 203 are located are all through holes, filled or embedded with non-magnetic materials.

[0048] In some embodiments, the rotor core 2 is a thin, one-piece structural component that can be obtained by stamping. The distance between the first magnetic isolation bridge 201 and the third magnetic isolation bridge 203 is greater than zero. Figure 3 In the case of g > zero, the rotor core 2 between the first magnetic isolation bridge 201 and the third magnetic isolation bridge 203 is connected to the rotor core 2 in its radially adjacent regions (specifically, the outer region along the radial direction of the rotor lamination and the inner region along the radial direction of the rotor lamination); and / or, the spacing between the second magnetic isolation bridge 202 and the magnet 1 is greater than zero, i.e. Figure 3 In this case, m > zero, so that the rotor core 2 between the second magnetic bridge 202 and the magnet 1 remains connected to the rotor core 2 in its radially adjacent regions (specifically, the outer region along the radial direction of the rotor lamination and the inner region along the radial direction of the rotor lamination). Furthermore, the support rib 24 is formed by a portion of the rotor core 2, i.e., the support rib 24 is part of the rotor core 2. However, this is not the only limitation. In other embodiments, the support rib 24 can be formed in other ways, such as by making a high-strength non-magnetic material into a strip-shaped or irregularly shaped support structure and installing it in the air slot to divide the air slot into the second magnetic bridge 202 and the third magnetic bridge 203. Alternatively, the two ends of the support member can be fixedly connected to the rotor core 2 by bonding, welding, snapping, plugging, or other arbitrary methods. The air slot can be divided into the second magnetic bridge 202 and the third magnetic bridge 203 by installing silicon steel strips in the air slot, and the two ends of these silicon steel strips can be fixedly connected to the rotor core 2 by bonding, welding, snapping, plugging, or other arbitrary methods.

[0049] In specific implementation, such as Figure 1As shown, multiple first magnetic isolation bridges 201 are arranged sequentially around the center point Q, with each first magnetic isolation bridge 201 corresponding to a multiple magnet 1; and / or, multiple second magnetic isolation bridges 202 are arranged sequentially around the center point Q, with each second magnetic isolation bridge 202 spaced apart from the multiple magnets 1; and / or, multiple third magnetic isolation bridges 203 are arranged sequentially around the center point Q, with each third magnetic isolation bridge 203 corresponding to a multiple second magnetic isolation bridge 202. In specific implementations, the number of any one or more of the first magnetic isolation bridges 201, second magnetic isolation bridges 202, and third magnetic isolation bridges 203 can be reduced or increased, or eliminated, as needed. Figure 1 Any one or more magnetic isolation bridges. This application does not specifically limit this.

[0050] In some embodiments, the side of the mounting slot for mounting the magnet 1 in the rotor core 2 is provided with a first through hole 21 communicating with the mounting slot. The first through hole 21 is further away from the center point Q at the end of the magnet 1 that is closer to the center point Q, and conversely, the first through hole 21 is closer to the center point Q at the end of the magnet 1 that is further away from the center point Q. In specific implementations, the first through hole 21 can be used as an injection molding hole. In this case, the first through hole 21 can be located at the exact center of one side of the mounting slot where the magnet 1 is located, or it can be positioned close to that exact center, so that the first through hole 21 is close to the midpoint of the magnet 1. Therefore, when non-magnetic material (also injection molding material) is injected into the rotor lamination through the first through hole 21 to fix the magnet 1 by injection molding, the injection molding material can enter the mounting slot where the magnet 1 is located and other nearby areas more evenly and comprehensively, providing reliable support for the fixation of the magnet 1 and the overall rigidity of the rotor. In a specific implementation, an arc-shaped groove can be provided on either side wall of the mounting slot for mounting the magnet 1 in the rotor core 2, serving as the first through hole 21. On a plane perpendicular to the central axis of the rotor lamination, the projected shape / cross-sectional shape of this arc-shaped groove is an arc that is concave away from the mounting slot. This direction away from the mounting slot specifically refers to the direction perpendicular to the depth direction of the mounting slot, and also perpendicular to the radial direction of the rotor lamination. However, this is not a limitation; in other embodiments, the first through hole 21 can also be a circular hole, an elliptical hole, a rectangular hole, a triangular hole, or any other through hole of any shape, as long as it achieves the purpose of injection molding and / or weight reduction.

[0051] In some embodiments, a second through hole 22 is provided between at least some adjacent mounting slots in the rotor core 2. Specifically, the third magnetic isolation bridge 203, the second magnetic isolation bridge 202, and the second through hole 22 can be arranged sequentially along the radial direction of the rotor laminations. Furthermore, the second through hole 22 can be a circular hole. This second through hole 22 can be used for riveting, weight reduction, rotor support press-fitting, or magnetic field adjustment, and can also be omitted depending on actual needs.

[0052] In some embodiments, auxiliary slots 23 are provided on the radially outer side of the rotor core 2. Specifically, the auxiliary slots 23 can be semi-circular slots, elliptical slots, or other arc-shaped slots, and one, two, or more auxiliary slots 23 can be provided at intervals between each pair of adjacent magnets 1. The auxiliary slots 23 can reduce cogging torque, torque pulsation, and noise.

[0053] In some embodiments, the radially outer side of the rotor core 2 is further provided with a limiting boss 25 that can engage and limit the magnet 1. Therefore, please refer to... Figure 1 and Figure 3 The distance b between the end of magnet 1 furthest from center point Q and center point Q is less than the outer diameter a of rotor core 2. In specific implementation, limit bosses 25 are symmetrically provided on both sides of each magnet 1 on the radial outer side of rotor core 2 to limit magnet 1 and prevent magnet 1 from flying out of the mounting slot of rotor core 2.

[0054] Please see Figure 3 In some embodiments, the rotor laminations can be specifically designed and tested according to the following requirements: the average spacing distance d between adjacent magnets 1 and the magnetization thickness c of magnet 1 satisfy 1 / 4 ≤ c / d ≤ 3 / 4, for example, c:d = 1:2, that is, the ratio of the average spacing distance d between adjacent magnets 1 to the magnetization thickness c of magnet 1 is approximately 2; and / or, the length e of magnet 1 in the radial direction of the rotor lamination and the magnetization thickness c of magnet 1 satisfy zero < c / e ≤ 1 / 3, for example, c:e = 1:3 or 1:4, that is, the length e of magnet 1 in the radial direction of the rotor lamination is at least three times the magnetization thickness c of magnet 1; and / or, the distance between the inner annular side of rotor core 2 and the center point Q (i.e., Figure 3 The inner diameter k of the rotor core 2 shown is smaller than the distance between the side of the first magnetic bridge 201 near the center point Q and the center point Q, that is... Figure 3 In the given condition, k < h, and the specific values ​​of k and h can be determined based on the actual assembly process and strength requirements; and / or, the length of the side of the first magnetic bridge 201 closest to the magnet 1 is greater than the length of the side of the first magnetic bridge 201 furthest from the magnet 1, for example, the first magnetic bridge 201 is trapezoidal or approximately trapezoidal, with rounded chamfers at its corners; and / or, the length of the side of the first magnetic bridge 201 furthest from the magnet 1 is less than the magnetization thickness of the magnet 1, i.e. Figure 3 In the case where f < c; and / or, the distance between the side of the third magnetic isolation bridge 203 near the center point Q and the center point Q is greater than the distance between the side of the first magnetic isolation bridge 201 near the center point Q and the center point Q, that is... Figure 1 and Figure 3In the case of i > h; and / or, the length of the side of the third magnetic bridge 203 closest to the second magnetic bridge 202 is greater than the length of the side of the third magnetic bridge 203 furthest from the second magnetic bridge 202, for example, the third magnetic bridge 203 is trapezoidal or approximately trapezoidal, and its corners are rounded chamfers; and / or, the opening shape of the second magnetic bridge 202 is triangular, and its side closest to the third magnetic bridge 203 is parallel to and approximately equal in length to the side of the third magnetic bridge 203 closest to the second magnetic bridge 202.

[0055] In summary, this application also provides a method for manufacturing rotor laminations suitable for high-torque starter-generator integrated machines, mainly including the following steps:

[0056] ① Determine the stator outer diameter that meets the requirements using classical formulas, and then subtract the air gap length to obtain the rotor outer diameter (i.e., the outer diameter a of rotor core 2) based on the actual process level and safety factor. Determine the number of magnet pairs based on the rotor outer diameter, controller control frequency, and winding coefficient.

[0057] ② The magnets are arranged radially with tangential magnetization to increase magnetic flux and improve torque; the outer diameter of the magnets (i.e., the distance b between the end of the magnet 1 away from the center point Q of the rotor core ring structure and the center point Q) is smaller than the outer diameter of the rotor; and the outer radial side of the rotor core 2 is provided with a limiting boss 25 that is symmetrical about the central axis of the magnet 1 to hold the magnet 1 and prevent the magnet 1 from flying out.

[0058] ③ The ratio of the magnetization thickness c of magnet 1 to the average spacing d between adjacent magnets 1 is approximately 1:2, and the ratio of the magnetization thickness c of magnet 1 to the length e of magnet 1 in the radial direction of rotor lamination is less than 1:3.

[0059] ④ In the radial direction of the rotor core 2, a trapezoidal or trapezoidal first magnetic isolation bridge 201 is opened outward at one end of the magnet 1 near the center point Q, and its lower base f is less than the magnetization thickness c of the magnet.

[0060] ⑤ At a position adjacent to the first magnetic isolation bridge 201 and with the same outer diameter, a trapezoidal or trapezoidal third magnetic isolation bridge 203 is cut out, which is a certain distance g from the first magnetic isolation bridge 201. The outer diameter i of the upper bottom of the third magnetic isolation bridge 203 (i.e., the distance between the side of the third magnetic isolation bridge 203 near the center point Q and the center point Q) is greater than the outer diameter h of the upper bottom of the first magnetic isolation bridge 201 (i.e., the distance between the side of the first magnetic isolation bridge 201 near the center point Q and the center point Q).

[0061] ⑥ A triangular or triangular second magnetic bridge 202 is formed on the radial outer side of the third magnetic bridge 203. The second magnetic bridge 202 and the third magnetic bridge 203 are separated by a certain distance j by a support rib 24, and the two sides of the support rib 24 (i.e. the two sides of the second magnetic bridge 202 and the third magnetic bridge 203 that are close to each other) are approximately equal.

[0062] ⑦ A second through hole 22 can also be opened between adjacent magnets 1, which is also between adjacent mounting slots in rotor core 2, for riveting, weight reduction, rotor bracket pressing, or magnetic field adjustment, etc., or it can be left unopened according to actual needs.

[0063] ⑧ In the rotor core 2, a small arc-shaped first through hole 21 is opened at the center of the side of the mounting slot as an injection hole. Finally, an arc-shaped auxiliary slot 23 is opened on the radial outer side of the rotor core 2 to reduce cogging torque (cogging torque refers to the periodic torque fluctuation caused by the interaction between the mounting slot of the rotor core 2 and the magnet 1), torque pulsation, and noise. The inner diameter k of the rotor core 2 is smaller than the inner diameter h of the first magnetic isolation bridge 201 (h is the distance between the side of the first magnetic isolation bridge 201 near the center point Q and the center point Q), which is determined according to the assembly process and strength.

[0064] ⑨ The final specific dimensions of magnet 1, magnetic bridge, rotor core 2, etc. can be determined through finite element simulation.

[0065] In the above rotor lamination manufacturing method, a high-torque rotor lamination suitable for flat starter-generator can be quickly designed through steps ①②③. Through the design of the magnetic isolation bridge in steps ④⑤⑥, not only can leakage magnetics be reduced and the magnetic circuit be cleared, but it is also more conducive to making the tangentially magnetized radially arranged magnets and rotor core into one piece, directly stamping, which is convenient for processing and easy for installation.

[0066] On the other hand, this application also provides a motor with the rotor laminations described above, and the motor can be a flat, high-torque starter-generator integrated unit. A starter-generator integrated unit refers to a device that integrates the starter and generator functions of an engine, typically sandwiched between the engine and the gearbox. In specific implementations, the motor can employ tangentially magnetized, radially arranged magnets to increase magnetic flux and improve torque.

[0067] The basic principles of this application have been described above with reference to specific embodiments. However, it should be noted that the advantages, benefits, and effects mentioned in this application are merely examples and not limitations, and should not be considered as essential features of each embodiment of this application. Furthermore, the specific details disclosed above are for illustrative and facilitative purposes only, and are not limitations. These details do not limit the application to the necessity of employing the aforementioned specific details for implementation.

[0068] The block diagrams of devices, apparatuses, devices, and systems involved in this application are merely illustrative examples and are not intended to require or imply that they must be connected, arranged, or configured in the manner shown in the block diagrams. As those skilled in the art will recognize, these devices, apparatuses, devices, and systems can be connected, arranged, and configured in any manner. Words such as “comprising,” “including,” “having,” etc., are open-ended terms meaning “including but not limited to,” and are used interchangeably with them. The terms “or” and “and” as used herein refer to the terms “and / or,” and are used interchangeably with them unless the context clearly indicates otherwise. The term “such as” as used herein refers to the phrase “such as but not limited to,” and is used interchangeably with it.

[0069] It should also be noted that in the apparatus, equipment, and methods of this application, the components or steps can be disassembled and / or recombined. These disassemblies and / or recombinations should be considered as equivalent solutions of this application.

[0070] The above description of the disclosed aspects is provided to enable any person skilled in the art to make or use this application. Various modifications to these aspects will be readily apparent to those skilled in the art, and the general principles defined herein can be applied to other aspects without departing from the scope of this application. Therefore, this application is not intended to be limited to the aspects shown herein, but rather to be accorded the widest scope consistent with the principles and novel features disclosed herein.

[0071] It should be understood that the qualifiers “first,” “second,” “third,” “fourth,” “fifth,” and “sixth” used in the description of the embodiments of this application are only used to more clearly illustrate the technical solutions and are not intended to limit the scope of protection of this application.

[0072] The above description has been given for purposes of illustration and description. Furthermore, this description is not intended to limit the embodiments of this application to the forms disclosed herein. Although numerous exemplary aspects and embodiments have been discussed above, those skilled in the art will recognize certain variations, modifications, alterations, additions, and sub-combinations thereof.

Claims

1. A rotor lamination, comprising a rotor core (2) of an annular structure, wherein the rotor core (2) is provided with a plurality of mounting slots arranged sequentially around the center point (Q) of the annular structure, and each mounting slot is provided with a magnet (1); Its features are, The rotor core (2) is also provided with: The first magnetic isolation bridge (201) is adjacent to the end of the magnet (1) near the center point (Q) and is closer to the center point (Q) than the magnet (1); The second magnetic isolation bridge (202) is located between adjacent magnets (1); The third magnetic isolation bridge (203) is adjacent to the end of the second magnetic isolation bridge (202) near the center point (Q), and is closer to the center point (Q) than the second magnetic isolation bridge (202); a support rib (24) is provided between the third magnetic isolation bridge (203) and the second magnetic isolation bridge (202).

2. The rotor lamination according to claim 1, characterized in that, The support rib (24) is formed by a portion of the rotor core (2).

3. The rotor lamination according to claim 1, characterized in that, The side of the mounting groove is provided with a first through hole (21) communicating with the mounting groove; The end of the first through hole (21) relative to the magnet (1) that is closer to the center point (Q) is further away from the center point (Q); The end of the first through hole (21) that is farther from the center point (Q) relative to the magnet (1) is closer to the center point (Q).

4. The rotor lamination according to claim 3, characterized in that, The first through hole (21) is an arc shape that is recessed in the direction away from the mounting groove.

5. The rotor lamination according to claim 1, characterized in that, The rotor core (2) is also provided with: A second through hole (22) is located between adjacent mounting slots; And / or, auxiliary slots (23) are located on the radially outer side of the rotor core (2); And / or, a limiting boss (25) is located on the radially outer side of the rotor core (2) and is engaged with and limited by the magnet (1).

6. The rotor lamination according to claim 1, characterized in that, The distance between the first magnetic isolation bridge (201) and the third magnetic isolation bridge (203) is greater than zero; And / or, the distance between the magnet (1) and the second magnetic bridge (202) is greater than zero.

7. The rotor lamination according to claim 1, characterized in that, The rotor core (2) is an integral structural component.

8. The rotor lamination according to claim 1, characterized in that, Multiple first magnetic isolation bridges (201) are arranged sequentially around the center point (Q), and each of the multiple first magnetic isolation bridges (201) corresponds to one of the multiple magnets (1); And / or, multiple second magnetic isolation bridges (202) are arranged sequentially around the center point (Q), and multiple second magnetic isolation bridges (202) are arranged at intervals with multiple magnets (1); And / or, multiple third magnetic isolation bridges (203) are arranged sequentially around the center point (Q), and the multiple third magnetic isolation bridges (203) correspond one-to-one with the multiple second magnetic isolation bridges (202).

9. The rotor lamination according to claim 1, characterized in that, The average spacing d between adjacent magnets (1) and the magnetization thickness c of the magnets (1) satisfy 1 / 4≤c / d≤3 / 4; And / or, the length e of the magnet (1) in the radial direction of the rotor lamination and the magnetization thickness c of the magnet (1) satisfy zero < c / e ≤ 1 / 3; And / or, the distance between the inner annular side of the rotor core (2) and the center point (Q) is less than the distance between the side of the first magnetic isolation bridge (201) near the center point (Q) and the center point (Q); And / or, the side length of the first magnetic bridge (201) closer to the magnet (1) is greater than the side length of the first magnetic bridge (201) farther from the magnet (1); And / or, the side length of the first magnetic bridge (201) away from the magnet (1) is less than the magnetization thickness of the magnet (1); And / or, the distance between the side of the third magnetic isolation bridge (203) near the center point (Q) and the center point (Q) is greater than the distance between the side of the first magnetic isolation bridge (201) near the center point (Q) and the center point (Q); And / or, the side length of the third magnetic bridge (203) closer to the second magnetic bridge (202) is greater than the side length of the third magnetic bridge (203) farther away from the second magnetic bridge (202); And / or, the opening shape of the second magnetic bridge (202) is triangular, and its side near the third magnetic bridge (203) is parallel and of the same length as the side of the third magnetic bridge (203) near the second magnetic bridge (202).

10. An electric motor, characterized in that, It is provided with rotor laminations as described in any one of claims 1 to 9.

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