Rotor punching sheet, motor rotor and motor

Abstract

The utility model is applicable to the technical field of motors, and provides a rotor punching sheet, a motor rotor and a motor, the rotor punching sheet comprises a punching sheet body, the punching sheet body is provided with a central shaft hole, permanent magnet mounting holes and magnetism increasing holes, and the center lines of the magnetism increasing holes are arranged along the quadrature axis of the rotor punching sheet. The motor rotor comprises a rotating shaft and a plurality of working modules, each working module comprises a plurality of rotor punching sheets, the plurality of working modules are arranged along the axial direction of the rotating shaft, and the rotating shaft is arranged in the central shaft hole of the punching sheet body in a penetrating manner. The motor comprises any one of the motor rotors. By arranging the magnetism increasing holes along the quadrature axis direction, the magnetic resistance of the rotor at the positions of the magnetism increasing holes on the quadrature axis can be increased, the overall magnetism gathering capability of the rotor punching sheet is improved, and the overall magnetic leakage of the rotor punching sheet is reduced, so that air gap flux density harmonic waves generated when a motor works are reduced, the air gap flux density is more sinusoidal, and the service life of the motor is prolonged. And the cogging torque and the torque pulsation of the motor during working are reduced, so that the working precision of the motor is improved.

Description

Technical Field

[0001] This utility model belongs to the field of motor technology, and in particular relates to a rotor lamination, a motor rotor, and a motor. Background Technology

[0002] An electric motor is a device that converts electrical energy into mechanical energy and generates driving torque. An electric motor typically consists of two main parts: a rotor and a stator. The rotor laminations are a crucial component of the rotor in an electric motor. Rotor laminations are parts produced using stamping technology, where multiple rotor laminations are stacked to form the rotor's core. However, the structural design of rotor laminations in current electric motors is unreasonable, leading to problems such as cogging torque and large torque fluctuations during operation, severely affecting the motor's working accuracy. Utility Model Content

[0003] The purpose of this utility model is to provide a rotor lamination, a motor rotor, and a motor, aiming to solve the technical problems of cogging torque and large torque fluctuation in the use of existing motors.

[0004] This utility model is implemented as follows: Firstly, a rotor lamination is provided, the rotor lamination including a lamination body, a central shaft hole being provided on the lamination body, and a plurality of permanent magnet mounting holes and a plurality of magnetizing holes being provided on the lamination body. The center lines of the magnetizing holes are all arranged along the cross axis of the rotor lamination, and the magnetizing holes are respectively located in a portion of the area between two of the permanent magnet mounting holes. In the direction along the cross axis of the rotor lamination, the end of the magnetizing hole near the central shaft hole protrudes out of the area between the two permanent magnet mounting holes.

[0005] In an optional embodiment, the distance between the magnetizing hole and the circumference of the lamination body is at least 1.3 times the length of the centerline of the magnetizing hole.

[0006] In an alternative embodiment, two adjacent magnetizing holes are symmetrically arranged with respect to the direct axis of the rotor lamination along the circumferential direction of the lamination body.

[0007] In an optional embodiment, the magnetizing hole has two oppositely arranged first sidewalls and two oppositely arranged second sidewalls. Both first sidewalls are planar structures and are parallel to the cross axis of the rotor lamination. Both first sidewalls are symmetrically arranged with respect to the cross axis of the rotor lamination. Both second sidewalls are arc-shaped structures, and the centers of both second sidewalls are located on the cross axis of the rotor lamination.

[0008] In an alternative embodiment, the lamination body has a plurality of arcuate protrusions on its circumference, the arcuate protrusions being located in the region between the two intersecting axes.

[0009] In an alternative embodiment, the radius of the arc-shaped protrusion is smaller than the radius of the lamination body, and the center of the arc-shaped protrusion is located on the direct axis of the rotor lamination.

[0010] In a second aspect, a motor rotor is provided, comprising a rotating shaft and a plurality of working modules, each of the working modules comprising a plurality of rotor laminations as described in any of the above claims, the plurality of working modules being arranged along the axial direction of the rotating shaft, and the rotating shaft passing through the central shaft hole of the lamination body.

[0011] In one alternative embodiment, the working module has multiple magnetic pole structures on its circumference, the multiple magnetic pole structures are uniformly arranged around the axial direction of the rotation axis, and the magnetic pole mechanisms on two adjacent working modules are staggered along the axial direction of the rotation axis.

[0012] In one optional embodiment, the working module has a plurality of spaced magnetic pole structures on its circumference, the plurality of magnetic pole structures being uniformly arranged around the axial direction of the rotation axis, and the plurality of working modules having the same deflection angle around the axial direction of the rotation axis.

[0013] Thirdly, an electric motor is provided, comprising the motor rotor described in any of the preceding claims.

[0014] The first aspect of this invention provides the following technical advantages: By providing a central shaft hole on the lamination body, the installation of the rotor laminations and the rotating shaft becomes more convenient. Furthermore, by providing multiple permanent magnet mounting holes evenly arranged around the central shaft hole on the lamination body, multiple mounting slots for accommodating permanent magnets can be formed after stacking multiple rotor laminations, making the installation of permanent magnets more convenient, secure, and rationally distributed. Additionally, multiple magnetizing holes are also provided on the lamination body. By setting magnetizing holes along the quadrature axis, the magnetic reluctance of the rotor at the location of the magnetizing holes on the quadrature axis can be increased. This improves the overall magnetizing ability of the rotor laminations and reduces the overall magnetic leakage of the rotor laminations. Consequently, it reduces the air gap magnetic flux density harmonics generated during motor operation, making the air gap magnetic flux density more sinusoidal. This reduces the cogging torque and torque pulsation of the motor during operation and also improves the motor's working accuracy. Furthermore, the magnetizing holes are located in a portion of the area between the two permanent magnet mounting holes, and the end of the magnetizing hole near the central shaft hole protrudes from the area between the two permanent magnet mounting holes along the quadrature axis of the rotor laminations. In this way, compared to setting the magnetizing holes in other positions, the cogging torque and torque pulsation of the motor during operation can be minimized to achieve optimal motor working accuracy.

[0015] It is understood that the beneficial effects of the second and third aspects mentioned above can be found in the relevant descriptions in the first aspect above, and will not be repeated here. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments of this utility model or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the rotor lamination structure provided in this embodiment of the utility model;

[0018] Figure 2 This is a partial structural schematic diagram of the rotor lamination provided in an embodiment of the present invention;

[0019] Figure 3 yes Figure 2 Enlarged structural diagram at point A;

[0020] Figure 4 This is a schematic diagram of the structure of the motor rotor provided in this embodiment of the utility model. Figure 1 ;

[0021] Figure 5 This is a schematic diagram of the structure of the motor rotor provided in this embodiment of the utility model. Figure 2 ;

[0022] Figure 6 This is a graph showing the test results of the cogging torque of the motor when the rotor laminations do not have magnetizing holes.

[0023] Figure 7 This is a graph showing the test results of torque pulsation in the motor when the rotor laminations do not have magnetizing holes.

[0024] Figure 8 This is a graph showing the test results of the cogging torque of the motor when the rotor laminations are equipped with magnetizing holes;

[0025] Figure 9 This is a graph showing the detection results of torque pulsation in the motor when magnetizing holes are set in the rotor laminations;

[0026] Explanation of reference numerals in the attached figures:

[0027] 10. Rotor laminations; 20. Working module; 30. Magnetic pole structure;

[0028] 1. Lamination body; 2. Central shaft hole; 3. Permanent magnet mounting hole; 4. Magnetizing hole; 41. First sidewall; 42. Second sidewall; 5. Intersecting axis; 6. Straight axis; 7. Arc-shaped protrusion; 8. Weight reduction hole. Detailed Implementation

[0029] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model.

[0030] In the description of this utility model, it should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0031] Furthermore, the terms "first" and "second" 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. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0032] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0033] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments.

[0034] Please refer to Figures 1 to 5 As shown, in a first aspect of this utility model embodiment, a rotor lamination is provided. The rotor lamination includes a lamination body 1, a central shaft hole 2 for a rotating shaft to pass through, a plurality of permanent magnet mounting holes 3 and a plurality of magnetizing holes 4 on the lamination body 1, the center lines of the magnetizing holes 4 are all arranged along the cross axis 5 of the rotor lamination, the magnetizing holes 4 are respectively located in a portion of the area between two permanent magnet mounting holes 3, and in the direction along the cross axis 5 of the rotor lamination, one end of the magnetizing hole 4 near the central shaft hole protrudes out of the area between the two permanent magnet mounting holes 3.

[0035] Specifically, the lamination body 1 refers to a plate-like structure with a certain thickness. The lamination body 1 is usually circular and is typically made of silicon steel sheet with a thickness of 0.35-0.5mm. The central shaft hole 2 refers to a hole structure with a certain diameter. The central shaft hole 2 is usually circular and its size matches the size of the rotating shaft. A clearance structure can also be provided on the inner wall of the central shaft hole 2. The clearance structure can form a keyway structure after multiple rotor laminations are stacked to prevent relative rotation between the iron core and the rotating shaft. The permanent magnet mounting hole 3 refers to a hole structure with a certain area. The permanent magnet mounting hole 3 is set through the lamination body 1. On a lamination body 1, multiple permanent magnet mounting holes 3 can be evenly distributed around the axis of the central shaft hole 2. The shape of the permanent magnet mounting hole 3 can be fan-shaped, trapezoidal, or a combination of multiple shapes.

[0036] The magnetizing hole 4 refers to a through-hole structure with a certain area. The centerline of the magnetizing hole 4 is the straight line that divides the magnetizing hole 4 into two symmetrical parts. The quadrature axis 5 and the direct axis 6 of the rotor lamination are coordinate axes defined based on the dual-axis theory of motors. Together, the quadrature axis 5 and the direct axis 6 constitute a coordinate system used to analyze the magnetic field and electromagnetic torque of the motor. The quadrature axis 5 is mainly used to describe the magnetic field components in the motor that are closely related to torque generation. Both the quadrature axis 5 and the direct axis 6 can be arranged radially along the rotor lamination, and they are arranged at an angle.

[0037] The rotor lamination provided in this embodiment of the invention facilitates the installation of the rotor lamination and the rotating shaft by providing a central shaft hole 2 on the lamination body 1. Furthermore, the lamination body 1 is provided with multiple uniform permanent magnet mounting holes 3 oriented around the central shaft hole 2. Multiple rotor laminations can be stacked to form multiple mounting slot structures for accommodating permanent magnets, making the installation of permanent magnets more convenient, secure, and rationally distributed. Simultaneously, the lamination body 1 is also provided with multiple magnetizing holes 4. Compared with rotor laminations in the prior art, by providing magnetizing holes 4 along the cross axis 5, with the centerline of each magnetizing hole 4 aligned with the cross axis 5 of the rotor lamination, and the magnetizing holes 4 located in a portion of the area between two permanent magnet mounting holes 3, and with one end of the magnetizing hole 4 protruding from the area between the two permanent magnet mounting holes 3 along the cross axis direction of the rotor lamination, this invention achieves a more comprehensive and efficient design. This design increases the magnetic reluctance of the rotor at the location of the magnetizing hole 4 on the quadrature axis 5, improves the overall magnetic focusing ability of the rotor laminations, and reduces the overall magnetic leakage of the rotor laminations. This reduces the air gap magnetic flux density harmonics generated during motor operation, making the air gap magnetic flux density more sinusoidal, reducing the cogging torque and torque pulsation during motor operation, and thus improving the motor's working accuracy. Furthermore, the magnetizing hole 4 is located in a portion of the area between the two permanent magnet mounting holes 3, and along the quadrature axis 5 of the rotor laminations, the end of the magnetizing hole 4 near the central shaft hole 2 protrudes from the area between the two permanent magnet mounting holes 3. Thus, compared to placing the magnetizing hole 4 in other locations, such as the entire area between the two permanent magnet mounting holes 3, this design maximizes the reduction of cogging torque and torque pulsation during motor operation, resulting in optimal motor working accuracy. In other words, compared to the entire area between the two permanent magnet mounting holes 3, this embodiment has smaller cogging torque and torque pulsation values.

[0038] In one embodiment, see Figure 3On the quadrature axis, the distance between the magnetizing hole 4 and the circumference of the lamination body 1 is at least 1.3 times the length of the centerline of the magnetizing hole 4. Specifically, the distance between the magnetizing hole 4 and the circumference of the lamination body 1 refers to the straight-line distance between the end of the magnetizing hole 4 away from the central shaft hole 2 and the circumference of the lamination body 1 along the quadrature axis direction, as shown in the distance between points B and C in the figure. The length of the centerline of the magnetizing hole 4 refers to the maximum length of the magnetizing hole 4 along the quadrature axis direction, as shown in the distance between points A and B in the figure. In this embodiment, by ensuring that the distance between the magnetizing hole 4 and the circumference of the lamination body 1 on the quadrature axis is at least 1.3 times the length of the centerline of the magnetizing hole 4, and by setting the magnetizing hole 4 at the aforementioned position on the lamination body, the magnetic field will be redistributed through the magnetizing hole 4, making the magnetic field transition between adjacent permanent magnets smoother. For example, the magnetic field generated by a permanent magnet might abruptly change at the boundary between adjacent permanent magnets. The presence of the magnetizing hole 4 acts as a "buffer zone" for the magnetic field, making the change in magnetic field from one permanent magnet to another more continuous, avoiding the problem of excessive magnetic field concentration, and optimizing the overall distribution of the magnetic field. Furthermore, along the cross-axis 5 of the rotor lamination, the distance between the magnetizing hole 4 and the circumference of the lamination body 1 is at least 1.3 times the length of the centerline of the magnetizing hole 4. This optimizes the magnetic field while ensuring the strength of the rotor lamination itself, thereby improving the motor's lifespan.

[0039] In one embodiment, see Figure 1 Along the circumferential direction of the lamination body 1, two adjacent magnetizing holes 4 are symmetrically arranged with respect to the direct axis 6 of the rotor lamination. Specifically, the direct axis 6 of the rotor lamination refers to the axis that coincides with the center line of the rotor magnetic pole in synchronous and asynchronous motors (based on equivalent circuit analysis). The direct axis 6 and the quadrature axis 5 together form a coordinate system for analyzing the motor's magnetic field and electromagnetic torque. In this embodiment, by symmetrically arranging two adjacent magnetizing holes 4 with respect to the direct axis 6 of the rotor lamination, the interaction between the magnetic field and current on the rotor lamination can be made more uniform. During motor operation, the interaction between the current and magnetic field in the rotor winding generates electromagnetic torque. By optimizing the magnetic field through the magnetizing holes 4, the fluctuation of electromagnetic torque within one cycle is reduced. This helps to balance torque pulsations caused by factors such as non-uniform magnetic field and unstable interaction between the stator and rotor, thereby making the motor output torque more stable.

[0040] In one embodiment, see Figure 2At least a portion of the magnetizing hole 4 is located in the region between the two permanent magnet mounting holes 3, and along the cross axis 5 of the rotor lamination, the end of the magnetizing hole 4 facing away from the central axis hole 2 is spaced apart from the outer wall of the lamination body 1. Specifically, when at least a portion of the magnetizing hole 4 is located between the two permanent magnet mounting holes 3, it can change the magnetic field coupling mode between the permanent magnets. In this region, the magnetic field is redistributed through the magnetizing hole 4, making the magnetic field transition between adjacent permanent magnets smoother. For example, the magnetic field generated by the permanent magnet may have abrupt changes at the boundary between adjacent permanent magnets, but the presence of the magnetizing hole 4 acts as a "buffer zone" for the magnetic field, making the change process of the magnetic field from one permanent magnet to another more continuous, avoiding the problem of magnetic field over-concentration, and optimizing the overall distribution of the magnetic field. In addition, along the cross axis 5 of the rotor lamination, the end of the magnetizing hole 4 facing away from the central axis hole 2 is spaced apart from the outer wall of the lamination body 1, which optimizes the magnetic field while ensuring the strength of the rotor lamination itself.

[0041] In one embodiment, see Figure 3 The magnetizing hole 4 has two opposing first sidewalls 41 and two opposing second sidewalls 42. Both first sidewalls 41 are planar structures and are parallel to the cross-axis 5 of the rotor lamination. Both first sidewalls 41 are symmetrically arranged with respect to the cross-axis 5 of the rotor lamination. Both second sidewalls 42 are arc-shaped structures, and the centers of both second sidewalls 42 are located on the cross-axis 5 of the rotor lamination. Specifically, by using two opposing first sidewalls 41 and two opposing second sidewalls 42 to form the entire magnetizing hole 4, and by ensuring that the shape and position of the magnetizing hole 4 are more rationally arranged, the two first sidewalls 41 are planar structures, parallel to the cross-axis 5 of the rotor lamination, symmetrically arranged with respect to the cross-axis 5 of the rotor lamination, and the two second sidewalls 42 are arc-shaped structures with their centers located on the cross-axis 5 of the rotor lamination, the magnetizing hole 4 can be made more rationally shaped and positioned.

[0042] In one specific embodiment, please refer to Figure 1 The outer diameter of the lamination body 1 is 52.3 mm, the inner diameter of the lamination body 1, which is also the diameter of the central shaft hole 2, is 23 mm, the length of the first sidewall 41 of the magnetizing hole 4 is 0.22 mm, the radius of the second sidewall 42 of the magnetizing hole 4 is 1.25 mm, and the distance between the end of the magnetizing hole 4 away from the central shaft hole 2 and the outer wall of the lamination body 1 is 4.6 mm, making the size and position of the magnetizing hole 4 more reasonable.

[0043] In one embodiment, see Figure 1The lamination body 1 has multiple arc-shaped protrusions 7 on its circumference, located in the area between two intersecting axes 5. Specifically, the arc-shaped protrusions 7 refer to protrusion structures with a certain height, and the overall protrusion structure is arc-shaped. The arc-shaped protrusions 7 and the lamination body 1 are generally integrally stamped. In this embodiment, setting arc-shaped protrusions 7 on the circumference of the rotor lamination can change the air gap shape and magnetic field distribution between the rotor and stator. When the motor is running, the magnetic field generated by the stator windings interacts with the rotor through the air gap. The arc-shaped protrusions 7 can make the air gap magnetic field more uniform, avoiding excessive concentration or weakness of the magnetic field in certain areas. For example, in a permanent magnet motor, the arc-shaped protrusions 7 can guide the magnetic field generated by the permanent magnet, making it more uniformly distributed in the air gap, thereby reducing torque pulsation and cogging torque caused by magnetic field inhomogeneity. In addition to the fundamental magnetic field, there are also harmonic magnetic fields in the motor rotor magnetic field. These harmonic magnetic fields may cause problems such as increased motor losses and torque pulsation. The presence of the arc-shaped protrusion 7 can alter the boundary conditions of the magnetic field, thus suppressing harmonic magnetic fields to a certain extent. By rationally designing the shape, size, and position of the arc-shaped protrusion 7, certain harmonic components can be mutually canceled, thereby reducing the impact of harmonic magnetic fields on motor performance.

[0044] In one embodiment, see Figure 1 The radius of the arc-shaped protrusion 7 is smaller than the radius of the lamination body 1, and the center of the arc-shaped protrusion 7 is located on the direct axis 6 of the rotor lamination. Specifically, by making the radius of the arc-shaped protrusion 7 smaller than the radius of the lamination body 1 and the center of the arc-shaped protrusion 7 located on the direct axis 6 of the rotor lamination, the boundary conditions of the magnetic field can be changed, which can suppress the harmonic magnetic field to a certain extent, causing some harmonic components to cancel each other out, thereby reducing the impact of the harmonic magnetic field on the motor performance and reducing the cogging torque and torque pulsation during motor operation.

[0045] Secondly, please refer to Figure 4 and Figure 5 A motor rotor is provided, including a rotating shaft (not shown in the figure) and multiple working modules 20. Each working module 20 includes multiple rotor laminations as described above. The multiple working modules 20 are arranged axially along the rotating shaft, and the rotating shaft passes through the central shaft hole 2 of the lamination body 1. In this embodiment, by forming working modules from rotor laminations provided with magnetizing holes 4, and by forming a motor rotor from multiple working modules and the rotating shaft, and by arranging multiple working modules axially along the rotating shaft, and by providing magnetizing holes 4 along the cross axis 5 of the rotor laminations, and by uniformly distributing the magnetizing holes 4 around the axis, the magnetic resistance of the rotor at the location of the magnetizing holes 4 on the cross axis 5 is increased, thereby improving the overall magnetic concentration capability of the rotor laminations and reducing the overall magnetic leakage of the rotor laminations. This reduces the air gap magnetic flux density harmonics generated during motor operation, making the air gap magnetic flux density more sinusoidal, and reducing the cogging torque and torque pulsation of the motor during operation.

[0046] In one embodiment, see Figure 4 The working module 20 has multiple magnetic pole structures 30 on its circumference. These magnetic pole structures 30 are uniformly arranged around the rotation axis, and the magnetic pole structures 30 on two adjacent working modules 20 are staggered along the axial direction of the rotation axis. Specifically, in this embodiment, by staggering the magnetic pole structures 30 on two adjacent working modules 20 along the axial direction of the rotation axis, the entire motor rotor forms a staggered pole structure, which can suppress the axial electromagnetic force on the motor rotor, reduce the influence of the axial electromagnetic force on the motor, and thus reduce the cogging torque and torque pulsation during motor operation.

[0047] In one embodiment, see Figure 5 The working module 20 has multiple spaced magnetic pole structures 30 on its circumference. These magnetic pole structures 30 are evenly arranged around the axis of rotation, and the deflection angles of the multiple working modules 20 are the same along this axis. In this embodiment, by ensuring that the deflection angles of the multiple working modules are the same along the axis of rotation, the entire motor rotor can form a straight-pole structure. Compared to a staggered-pole structure, this eliminates the need for complex processing and assembly steps such as segmentation and misalignment, making the rotor manufacturing process of the straight-pole structure relatively simple and reducing the motor's manufacturing cost.

[0048] Thirdly, a motor is provided, comprising a motor rotor according to any of the above-mentioned embodiments. Please refer to [link / reference]. Figures 6 to 9 , Figure 6 and Figure 7 These are the results of cogging torque and torque pulsation of the motor during operation when the rotor laminations do not have an additional magnetizing hole 4. Figure 8 and Figure 9 These figures show the cogging torque and torque pulsation results of the motor during operation when four magnetizing holes are added to the rotor laminations. The horizontal axis represents time, and the vertical axis represents the magnitude of the torque. The time step for collecting the cogging torque data from the electrodes was 0.1 seconds, the total collection time was 10 seconds, and the motor rotor speed was 1 deg / s. Torque pulsation was collected under the same line voltage and torque. The data in the figures show that both the cogging torque and torque pulsation decreased after adding four magnetizing holes to the rotor laminations.

[0049] The above are merely preferred embodiments of the present utility model, and only specifically describe the technical principles of the present utility model. These descriptions are only for explaining the principles of the present utility model and should not be construed as limiting the scope of protection of the present utility model in any way. Based on this explanation, any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present utility model, as well as other specific embodiments of the present utility model that can be conceived by those skilled in the art without creative effort, should be included within the scope of protection of the present utility model.

Claims

1. A rotor lamination, characterized in that, The rotor lamination includes a lamination body with a central shaft hole, a plurality of permanent magnet mounting holes and a plurality of magnetizing holes. The centerlines of the magnetizing holes are all arranged along the cross axis of the rotor lamination. The magnetizing holes are located in a portion of the area between two permanent magnet mounting holes, and one end of the magnetizing hole near the central shaft hole protrudes from the area between the two permanent magnet mounting holes along the cross axis of the rotor lamination.

2. The rotor lamination as described in claim 1, characterized in that, On the cross axis, the distance between the magnetizing hole and the circumference of the lamination body is at least 1.3 times the length of the centerline of the magnetizing hole.

3. The rotor lamination as described in claim 2, characterized in that, Along the circumferential direction of the lamination body, two adjacent magnetizing holes are symmetrically arranged with respect to the direct axis of the rotor lamination.

4. The rotor lamination as described in claim 3, characterized in that, The magnetizing hole has two oppositely arranged first sidewalls and two oppositely arranged second sidewalls. Both first sidewalls are planar structures and are parallel to the cross axis of the rotor lamination. Both first sidewalls are symmetrically arranged with respect to the cross axis of the rotor lamination. Both second sidewalls are arc-shaped structures and their centers are located on the cross axis of the rotor lamination.

5. The rotor lamination as described in any one of claims 1 to 4, characterized in that, The lamination body has multiple arc-shaped protrusions on its circumference, and the arc-shaped protrusions are located in the region between the two intersecting axes.

6. The rotor lamination as described in claim 5, characterized in that, The radius of the arc-shaped protrusion is smaller than the radius of the lamination body, and the center of the arc-shaped protrusion is located on the straight axis of the rotor lamination.

7. A motor rotor, characterized in that, It includes a rotating shaft and multiple working modules, each of which includes multiple rotor laminations as described in any one of claims 1 to 6. The multiple working modules are arranged along the axial direction of the rotating shaft, and the rotating shaft passes through the central shaft hole of the lamination body.

8. The motor rotor as described in claim 7, characterized in that, The working module has multiple magnetic pole structures on its circumference. These magnetic pole structures are evenly arranged around the axis of the rotation shaft, and the magnetic pole mechanisms on two adjacent working modules are staggered along the axial direction of the rotation shaft.

9. The motor rotor as described in claim 7, characterized in that, The working module has multiple phase-spaced magnetic pole structures on its circumference. These multiple magnetic pole structures are evenly arranged around the axis of the rotation shaft, and the deflection angles of the multiple working modules are the same in the direction of the axis of the rotation shaft.

10. An electric motor, characterized in that, Includes the motor rotor as described in any one of claims 7 to 9.

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