Rotor assembly, rotor and motor

Abstract

The present invention proposes a rotor assembly, a rotor and a motor, wherein the rotor assembly comprises: a plurality of rotor punchings, the plurality of rotor punchings are stacked, the plurality of rotor punchings comprise a first portion of rotor punchings and a second portion of rotor punchings, and along the axial direction of the rotor assembly, the second portion of rotor punchings are located at the end of the first portion of rotor punchings; a permanent magnet is arranged on the side walls of the plurality of rotor punchings; the rotor punchings comprise: a body; a convex portion, the convex portion is arranged on the side wall of the body; wherein the convex portion corresponding to the first portion of rotor punchings and the convex portion corresponding to the second portion of rotor punchings are arranged in an offset manner. In the rotor assembly provided by the present invention, the convex portion on the first portion of rotor punchings and the convex portion on the second portion of rotor punchings are arranged in an alternating manner, so that the permanent magnet will contact the surface of the convex portion of the partial rotor punching, and then the convex portion plays a limiting role in the axial stringing of the permanent magnet, so as to achieve the fixation of the permanent magnet along the axial direction of the rotor assembly.

Description

Technical Field

[0001] The present invention relates to the technical field of motors, and in particular to a rotor assembly, a rotor and a motor. Background Art

[0002] In the related art, after the permanent magnets of the motor are installed on the motor rotor, baffles or fixings need to be set at both ends of the motor rotor core to fix the permanent magnets along the circumferential direction of the rotor, which increases the overall axial length of the rotor, which is not only not conducive to the size setting of the motor, but also increases the difficulty of assembly. Summary of the invention

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

[0004] To this end, a first aspect of the present invention provides a rotor assembly.

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

[0006] A third aspect of the present invention provides an electric machine.

[0007] In view of this, the first aspect of the present invention proposes a rotor assembly, comprising: a plurality of rotor punchings, the plurality of rotor punchings are stacked, the plurality of rotor punchings include a first part of rotor punchings and a second part of rotor punchings, along the axial direction of the rotor assembly, the second part of rotor punchings are located at the end of the first part of rotor punchings; permanent magnets are arranged on the side walls of the plurality of rotor punchings; the rotor punchings include: a body; a convex portion, the convex portion is arranged on the side wall of the body; wherein the convex portion corresponding to the first part of the rotor punchings and the convex portion corresponding to the second part of the rotor punchings are staggered.

[0008] The rotor assembly provided by the present invention comprises a plurality of rotor punchings arranged in a stacked manner, and a permanent magnet. The plurality of rotor punchings are stacked to a corresponding thickness. Further, a plurality of permanent magnets are arranged on the side walls of the stacked rotor punchings. Further, the plurality of rotor punchings comprise a first portion of rotor punchings and a second portion of rotor punchings distributed in the axial direction, and the second portion of rotor punchings are located at the end of the first portion of rotor punchings. Further, convex portions are arranged on the side walls of the plurality of rotor punchings, and after the plurality of rotor punchings are stacked to form a rotor core, the convex portions on the first portion of rotor punchings and the convex portions on the second portion of rotor punchings are arranged alternately along the axial direction of the rotor assembly, that is, along the axial direction of the rotor, at least a portion of the convex portions on the side walls of the rotor body are not on the same straight line as another portion. Thus, when the plurality of rotor punchings are stacked, the convex portions of the second portion of rotor punchings located at the end are staggered relative to the convex portions of the first portion of rotor punchings. Therefore, when the permanent magnet is installed on the side wall of the rotor punching body, the end of the permanent magnet will contact the convex part of a part of the rotor punching, and then the convex part will limit the axial movement of the permanent magnet, so as to achieve the axial fixation of the permanent magnet along the rotor assembly.

[0009] In the rotor assembly provided by the present invention, the convex parts on the first part of the rotor punching sheets and the convex parts on the second part of the rotor punching sheets are arranged alternately along the axial direction of the rotor assembly. Therefore, when a plurality of rotor punching sheets are stacked, the permanent magnets will contact the surfaces of the convex parts of some of the rotor punching sheets, and then the convex parts will limit the axial movement of the permanent magnets, so as to achieve the fixation of the permanent magnets along the axial direction of the rotor assembly, and there is no need to set a limiter at at least one end of the rotor assembly to achieve the fixation of the permanent magnets, thus avoiding the increase of the axial length of the rotor assembly caused by the limiter, ensuring the size of the rotor assembly, and reducing the difficulty of assembling the rotor assembly.

[0010] Specifically, the first portion of rotor sheets includes one or more rotor sheets, and the second portion of rotor sheets includes one or more rotor sheets.

[0011] The above-mentioned rotor assembly provided by the present invention may also have the following additional technical features:

[0012] In the above technical solution, further, the convex portion includes: a first convex portion, which is arranged on the body corresponding to the first part of the rotor punching sheet; a second convex portion, which is arranged on the body corresponding to the second part of the rotor punching sheet; wherein the second convex portion abuts against the end of the permanent magnet.

[0013] In this technical solution, the protrusion includes a first protrusion located on the first part of the rotor punching and a second protrusion located on the second part of the rotor punching, and when a plurality of rotor punchings are stacked, the first protrusion and the second protrusion are alternately arranged along the axial direction of the rotor assembly, so that when a plurality of rotor punchings are stacked, the first protrusion on the first part of the rotor punching and the second protrusion on the second part of the rotor punching can be located in different planes, thereby achieving the abutment between the end of the permanent magnet and the surface of the second protrusion, thereby achieving the fixation of the permanent magnet in the axial direction.

[0014] Furthermore, when installing the permanent magnet, the permanent magnet is arranged in the gap between multiple adjacent first protrusions of the rotor punching, and at the same time, the second protrusion is staggered with the first protrusion along the axial direction of the rotor assembly. Then, the end of the permanent magnet is axially limited by the second protrusion to achieve the fixation of the permanent magnet in the axial direction of the rotor assembly, thereby eliminating the need to set limiters at both ends of the rotor assembly, thereby reducing the axial length of the motor.

[0015] In any of the above technical solutions, further, the rotor assembly also includes: an axial hole that penetrates the multiple rotor punchings that are stacked.

[0016] In this technical solution, the rotor assembly is also provided with an axial hole penetrating through the stacked plurality of rotor punchings, the axial hole being used to install the rotating shaft, so that the rotor assembly can be rotated through the rotating shaft. Furthermore, the axial hole is located at the center of the plurality of rotor punchings, so that the permanent magnets can be evenly arranged on the circumference of the axial hole, that is, the permanent magnets can be located on the circumference of the rotating shaft, and thus during the operation of the rotor assembly, the magnetic field generated by the permanent magnets can effectively form electromagnetic induction, thereby ensuring the operation effect and efficiency of the rotor assembly.

[0017] In any of the above technical solutions, further, a line between a first point on the first protrusion and a center point of the shaft hole is a first line; a line between a second point on the second protrusion and a center point of the shaft hole is a second line; and projection is performed along the axial direction of the rotor assembly, and a first angle is formed between the first line and the second line in the obtained projection plane.

[0018] In this technical solution, the first point on the first convex part is connected to the center point of the shaft hole to form a first connecting line, and at the same time, the second point on the second convex part is connected to the center point of the shaft hole to form a second connecting line. Further, the rotor assembly is projected along the axial direction, and the positional relationship between the first connecting line and the second connecting line is observed in the obtained projection plane. A first angle is formed between the first connecting line and the second connecting line, thereby realizing the staggered arrangement of the first hole and the second convex part.

[0019] That is to say, by forming a first angle between the first connecting line and the second connecting line, on the basis that the first connecting line passes through the first convex part and the second connecting line passes through the second convex part, it is ensured that the positions of the first convex part and the second convex part do not overlap, that is, it is ensured that the first convex part and the second convex part cannot completely overlap, thereby achieving the staggered arrangement of the first convex part and the second convex part. In addition, the two opposite side walls of the permanent magnet are respectively abutted against the first convex parts on both sides, and the end of the permanent magnet is abutted against the surface of the second convex part, thereby achieving the fixation of the permanent magnet in the axial direction of the rotor assembly through the second convex part.

[0020] Specifically, the first point on the first protrusion can be any point on the circumferential contour line of the first protrusion, and the second point on the second protrusion can be any point on the circumferential contour line of the second protrusion. The first point and the second point are selected from the points at the same position on the first protrusion and the second protrusion. For example, in the clockwise direction, the first point selects the starting point of the first protrusion, and the second point also selects the starting point of the second protrusion; or, the first point selects the midpoint of the first protrusion, and the second point also selects the end point of the second protrusion; or the first point selects the end point of the first protrusion, and the second point also selects the end point of the second protrusion.

[0021] In any of the above technical solutions, further, the value range of the first angle is greater than 0° and less than or equal to the quotient of 360° and 2 times the number of pole pairs of the permanent magnet.

[0022] In this technical solution, by setting the first angle to be greater than 0°, on the basis that the first connecting line passes through the first protrusion and the second connecting line passes through the second protrusion, it is ensured that the positions of the first protrusion and the second protrusion do not overlap, that is, it is ensured that the first protrusion and the second protrusion cannot completely overlap, thereby achieving the staggered arrangement of the first protrusion and the second protrusion, ensuring that the side wall of the permanent magnet can abut against the outer side wall of the second protrusion, and also achieving the abutment of the end of the permanent magnet against the surface of the second protrusion, thereby ensuring the axial fixation of the permanent magnet.

[0023] In any of the above technical solutions, further, the structure of the first part of the rotor punching sheet is the same as the structure of the second part of the rotor punching sheet.

[0024] In this technical solution, by adopting the same structure for the rotor punchings of the first part and the second part, on the one hand, the rotor punchings are universal, and there is no need to perform a mold opening process for a new structure, thereby reducing production costs. On the one hand, by adopting the rotor punchings of the same structure, it is only necessary to continue to use the existing rotor punching structure. By adopting the same rotor punchings, when installing the permanent magnets, all the rotor punchings are aligned, and after the permanent magnets are installed in place, the second part of the rotor punchings is rotated so that the convex parts corresponding to the first part of the rotor punchings are staggered with the convex parts corresponding to the second part of the rotor punchings, thereby achieving axial positioning of the end of the permanent magnet through the convex parts of the second part of the rotor punchings, thereby eliminating the end limiter, reducing the axial length of the motor, and facilitating the disassembly and maintenance of the rotor.

[0025] In any of the above technical solutions, further, the multiple rotor punchings also include: a third part rotor punching, the first part rotor punching is located between the third part rotor punching and the second part rotor punching; the protrusion also includes: a third protrusion, which is arranged on the main body corresponding to the third part rotor punching; wherein, along the axial direction of the rotor assembly, the third protrusion is staggered with the first protrusion and the second protrusion.

[0026] In this technical solution, a third convex portion may be further provided on some of the rotor punchings among the multiple rotor punchings. That is, the multiple rotor punchings may be divided into at least three parts, wherein the first part is provided with a first convex portion, the second part is provided with a third convex portion, and the third part is provided with a third convex portion. Furthermore, along the axial direction of the rotor assembly, the third convex portion is staggered with the first convex portion and the second convex portion. Thus, when the multiple rotor punchings are stacked, the outer side wall of the first convex portion, the outer side wall of the second convex portion, and the outer side wall of the third convex portion are not on the same plane.

[0027] Furthermore, when installing the permanent magnet, the permanent magnet can be arranged in the gap between multiple adjacent first protrusions. At the same time, the second protrusions and the third protrusions are in an alternating arrangement with the first protrusions, so that the outer wall of the permanent magnet can contact the outer side wall of the adjacent first protrusion, and the end of the permanent magnet is simultaneously abutted against the surface of the second protrusion and the surface of the third protrusion, thereby achieving axial limitation of the permanent magnet and improving the stability of the permanent magnet installation.

[0028] Specifically, the second part and the third part of the rotor punching can be arranged at the end of the first part of the rotor punching, and the number of the rotor punchings in the first part can be set to match the length of the permanent magnet, so that the length of the permanent magnet can be adapted to the length of the stacked rotor punchings to ensure that the rotor assembly can achieve the best magnetic flux effect during operation.

[0029] In any of the above technical solutions, further, the line between the third point of the third protrusion and the center point of the shaft hole is the third line; projecting along the axial direction of the rotor assembly, in the obtained projection plane, a second angle is formed between the first line and the third line.

[0030] In this technical solution, the third point of the third convex portion is connected to the center point of the shaft hole to form a third connecting line. Furthermore, projection is performed along the axial direction of the rotor assembly, and the positional relationship between the first connecting line and the third connecting line is observed in the obtained projection plane, and a second angle is formed between the first connecting line and the third connecting line, thereby realizing the staggered arrangement of the first convex portion and the third convex portion.

[0031] That is to say, by forming a second angle between the first line and the third line, on the basis that the first line passes through the first convex portion and the third line passes through the third convex portion, it is ensured that the positions of the first convex portion and the third convex portion do not overlap, that is, it is ensured that the first convex portion and the third convex portion cannot completely overlap, thereby achieving the staggered arrangement of the first convex portion and the third convex portion.

[0032] Specifically, the first point on the first protrusion can be any point on the circumferential contour line of the first protrusion, and the third point on the third protrusion can be any point on the circumferential contour line of the third protrusion. The first point and the third point are selected from the points at the same position on the first protrusion and the third protrusion. For example, in the clockwise direction, the first point selects the starting point of the first protrusion, and the third point also selects the starting point of the third protrusion; or, the first point selects the midpoint of the first protrusion, and the third point also selects the end point of the third protrusion; or the first point selects the end point of the first protrusion, and the third point also selects the end point of the third protrusion.

[0033] In any of the above technical solutions, further, the sum of the first angle and the second angle has a value range of: greater than 0° and less than or equal to the quotient of 360° and 2 times the number of pole pairs of the permanent magnet.

[0034] In this technical solution, by setting the value of the sum of the first angle and the second angle to be greater than 0°, on the basis that the first connecting line passes through the first convex portion, the second connecting line passes through the second convex portion, and the third connecting line passes through the third convex portion, it is ensured that the positions of the first convex portion, the second convex portion and the third convex portion do not overlap, that is, it is ensured that the first convex portion, the second convex portion and the third convex portion cannot completely overlap, thereby achieving the staggered arrangement of the first convex portion, ensuring that both sides of the permanent magnet can contact the outer side wall of the adjacent first convex portion, and at the same time, the two ends of the permanent magnet are respectively abutted against the surface of the second convex portion and the surface of the third convex portion, thereby ensuring the fixation of the permanent magnet.

[0035] Furthermore, by setting the sum of the first angle and the second angle to be less than or equal to the quotient of 360° and 2 times the number of pole pairs of the permanent magnet, the first convex portion, the second convex portion and the third convex portion are all arranged on the rotor punching sheet with the center point of the shaft hole as the circular circumference, and the first convex portion, the second convex portion and the third convex portion are all the same in shape and size, it is ensured that the sum of the first angle and the second angle is between 0° and 360° and 2 times the quotient of the number of pole pairs of the permanent magnet, so that it can be ensured that the first convex portion on the first part of the rotor punching sheet can be located between two adjacent second convex portions of the second part of the rotor punching sheet, and at least a part of the first convex portion can also be located between two adjacent third convex portions of the third part of the rotor punching sheet, so that it is ensured that the first convex portion, the second convex portion and the third convex portion cannot completely overlap, that is, the staggered arrangement of the first convex portion, the second convex portion and the third convex portion is achieved, and the fixing effect of the permanent magnet is ensured.

[0036] In any of the above technical solutions, further, the structure of the third part of the rotor punchings is the same as the structure of the first part of the rotor punchings.

[0037] In this technical solution, by using the same structure for the rotor punchings of the first part and the third part, on the one hand, the rotor punchings are universal, and there is no need to perform a mold opening process for a new structure, thereby reducing production costs. On the other hand, by using the rotor punchings of the same structure, it is only necessary to continue to use the existing rotor punching structure. By using the same rotor punchings, when installing the permanent magnets, all the rotor punchings are aligned. After the permanent magnets are installed in place, the third part of the rotor punchings is rotated so that the convex parts corresponding to the first part of the rotor punchings are staggered with the convex parts corresponding to the third part of the rotor punchings, thereby achieving axial positioning of the end of the permanent magnet through the convex parts of the third part of the rotor punchings, thereby eliminating the end limiter, reducing the axial length of the motor, and facilitating the disassembly and maintenance of the rotor.

[0038] In any of the above technical solutions, further, the rotor assembly also includes: a fixing member, which is sleeved on the outer side of the permanent magnet.

[0039] In this technical solution, the rotor assembly can also be provided with a fixing piece, which is sleeved on the outside of the permanent magnet, so as to fix the permanent magnet in the radial direction of the rotor assembly and prevent the permanent magnet from falling off. By setting the fixing piece, in conjunction with the convex portion provided on the side wall of the rotor punching, the permanent magnet is fixed in the axial direction and in the radial direction when it is installed on the rotor punching, thereby ensuring the stability of the permanent magnet installation and thus ensuring the stable operation of the rotor assembly.

[0040] In any of the above technical solutions, further, the permanent magnets include: N-pole permanent magnets and S-pole permanent magnets, and along the circumferential direction of the rotor assembly, the N-pole permanent magnets and the S-pole permanent magnets are alternately arranged on the circumferential side walls of the rotor punchings.

[0041] In this technical solution, by arranging the permanent magnets as N-pole permanent magnets and S-pole permanent magnets, and staggering the N-pole permanent magnets and the S-pole permanent magnets along the circumferential direction of the rotor assembly on the side walls of the rotor punchings, it is ensured that the two adjacent permanent magnets of the N-pole permanent magnets are both S-pole permanent magnets, and the two adjacent permanent magnets of the S-pole permanent magnets are both N-pole permanent magnets, so that the adjacent S-pole permanent magnets and N-pole permanent magnets cooperate with each other, ensuring the uniformity of the magnetic field strength and the distribution of magnetic flux lines between the two, thereby ensuring the stable operation of the rotor assembly.

[0042] According to a second aspect of the present invention, a rotor is proposed, comprising: a rotor assembly as described in any one of the above technical solutions.

[0043] The rotor provided by the present invention includes a rotor assembly as described in any one of the above technical solutions, so the rotor has all the beneficial effects of the rotor assembly proposed in the first aspect, which will not be repeated here.

[0044] In any of the above technical solutions, further, the rotor also includes: a rotating shaft, which is arranged in the shaft hole of the rotor assembly.

[0045] In this technical solution, by setting the rotating shaft in the shaft hole of the rotor assembly, the rotor as a whole can stably rotate around the rotating shaft, thereby driving multiple permanent magnets in the rotor assembly to rotate, thereby achieving stable operation of the rotor.

[0046] According to a third aspect of the present invention, a motor is proposed, comprising: a rotor as in any one of the above technical solutions.

[0047] The motor provided by the present invention includes a rotor as in any one of the above technical solutions, and thus the motor has all the beneficial effects of the rotor proposed in any one of the above technical solutions, which will not be described in detail here.

[0048] Additional aspects and advantages of the present invention will become apparent from the following description or may be learned by practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0050] Figure 1 A schematic structural diagram of a rotor assembly according to an embodiment of the present invention is shown;

[0051] Figure 2 Shows Figure 1 A schematic diagram of the structure of the rotor punching of the illustrated embodiment;

[0052] Figure 3 Shows Figure 1 A schematic diagram of the axial structure of the embodiment shown;

[0053] Figure 4 A schematic structural diagram of a rotor assembly according to another embodiment of the present invention is shown;

[0054] Figure 5 Shows Figure 4 A schematic diagram of the structure of the rotor punching of the illustrated embodiment;

[0055] Figure 6 Shows Figure 4 A schematic diagram of the axial structure of the embodiment shown;

[0056] Figure 7 A schematic structural diagram of a rotor assembly according to another embodiment of the present invention is shown;

[0057] Figure 8 A schematic structural diagram of a rotor assembly according to another embodiment of the present invention is shown;

[0058] Fig. 9 A schematic structural diagram of a rotor according to an embodiment of the present invention is shown.

[0059] in, Figures 1 to 9 The corresponding relationship between the reference numerals and component names in the figure is:

[0060] 100 rotor assembly, 110 rotor punching, 1102 first part rotor punching, 1104 second part rotor punching, 1106 third part rotor punching, 112 body, 114 protrusion, 1142 first protrusion, 1144 second protrusion, 1146 third protrusion, 120 permanent magnet, 130 shaft hole, 140 first connecting line, 150 second connecting line, 160 third connecting line, 170 fixing part, 200 rotor, 220 rotating shaft. DETAILED DESCRIPTION

[0061] In order to more clearly understand the above-mentioned purpose, features and advantages of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

[0062] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the protection scope of the present invention is not limited to the specific embodiments disclosed below.

[0063] Refer to the following Figures 1 to 9 A rotor assembly 100 , a rotor 200 , and a motor according to some embodiments of the present invention are described.

[0064] Embodiment 1:

[0065] like Figure 1 , Figure 2 , Figure 3 and Figure 7 , Figure 8 As shown, an embodiment of the first aspect of the present invention proposes a rotor assembly 100, comprising: a plurality of rotor punchings 110 and permanent magnets 120 arranged on the side walls of the plurality of rotor punchings 110, wherein the plurality of rotor punchings 110 are stacked, and the plurality of rotor punchings include a first portion of rotor punchings 1102 and a second portion of rotor punchings 1104, and along the axial direction of the rotor assembly, the second portion of rotor punchings 1104 are located at the end of the first portion of rotor punchings 1102.

[0066] Furthermore, the rotor punching 110 includes a body 112 and a protrusion 114; the protrusion 114 is arranged on the side wall of the body 112; wherein, along the axial direction of the rotor assembly 100, the protrusion 114 corresponding to the first part of the rotor punching 1102 and the protrusion 114 corresponding to the second part of the rotor punching 1104 are staggered.

[0067] The rotor assembly 100 provided by the present invention comprises a plurality of rotor punchings 110 arranged in a stacked manner, and a permanent magnet 120. The plurality of rotor punchings 110 are stacked to a corresponding thickness. Furthermore, the plurality of permanent magnets 120 are arranged on the stacked plurality of rotor punchings 110 so that the permanent magnets 120 can be installed on the side walls of the rotor punchings 110 along the length direction of the rotor assembly 100, and the length of the permanent magnets 120 can be matched with the axial length of the rotor core, thereby obtaining the best magnetic flux effect. Furthermore, the plurality of rotor punchings comprise a first portion of rotor punchings 1102 and a second portion of rotor punchings 1104 distributed in the axial direction, and the second portion of rotor punchings 1104 are located at the end of the first portion of rotor punchings 1102.

[0068] Furthermore, the side walls of the plurality of rotor punchings 110 are all provided with convex portions 114, and along the axial direction of the rotor assembly 100, the convex portions 114 on the first portion of the rotor punchings 1102 are arranged alternately with the convex portions 114 on the second portion of the rotor punchings 1104. That is, along the axial direction of the rotor, at least a portion of the convex portions 114 on the side walls of the rotor body 112 are not on the same straight line as the other portion. Thus, when the plurality of rotor punchings 110 are stacked, the convex portions 114 of at least a portion of the rotor punchings 110 are staggered relative to the convex portions 114 of the other portion of the rotor punchings 110. Therefore, when the permanent magnet 120 is installed on the side wall of the rotor punching body 112, the end of the permanent magnet 120 contacts the protrusion 114 of part of the rotor punching 110, and the protrusion limits the axial movement of the permanent magnet 120, so as to achieve the axial fixation of the permanent magnet 120 along the rotor assembly 100.

[0069] Specifically, the convex parts 114 on the first part of the plurality of rotor punchings 110 can be completely overlapped, and the convex parts 114 on the second part can also be set to completely overlap, and then when the two parts of the rotor punchings 110 are stacked, the convex parts 114 on the two parts of the rotor punchings 110 are staggered. When the rotor assembly is running, the convex parts 114 that contact the ends of the permanent magnets 120 can be located at the bottom along the gravity direction, so that the permanent magnets 120 are supported by the convex parts 114, so as to limit the axial stringing of the permanent magnets 120 and ensure the stability of the permanent magnets 120.

[0070] It is understandable that a portion of the plurality of rotor punchings 110 may be one of the plurality of rotor punchings 110, or may be a plurality of the plurality of rotor punchings 110. Specifically, the convex portion 114 of the second portion of rotor punchings 1104 located at one end of the plurality of rotor punchings 110 may be arranged to be staggered relative to the position of the convex portion 114 of the first portion of rotor punchings 1102, so as to achieve axial limitation of the permanent magnet 120.

[0071] Furthermore, the multiple rotor punchings 110 can be divided into three or more parts, and the protrusions 114 of the rotor punchings 110 between any two parts of the multiple parts are staggered, so that the permanent magnets 120 are installed on the side walls of the rotor punchings 110, and the side walls of the permanent magnets 120 can contact with the protrusions 114 on one part of the rotor punchings 110, and the ends can contact with the protrusions on the other two parts of the rotor punchings 110, thereby realizing axial limiting of the permanent magnets 120 from the ends of the permanent magnets 120, thereby improving the stability of the permanent magnets 120.

[0072] In the rotor assembly 100 provided by the present invention, the convex parts 114 on the first rotor punching sheet 1102 and the convex parts 114 on the second rotor punching sheet 1104 are arranged alternately along the axial direction of the rotor assembly 100. Therefore, when a plurality of rotor punching sheets 110 are stacked, the permanent magnet 120 abuts against the surface of the convex parts 114 on the second rotor punching sheet 1104 located at the end, and then the convex parts 114 play a limiting role in the axial stringing of the permanent magnet 120, so as to achieve the axial fixation of the permanent magnet 120 in the rotor assembly 100, and it is not necessary to set a limiting member at at least one end of the rotor assembly 100 to achieve the fixing of the permanent magnet 120, so as to avoid the increase of the axial length of the rotor assembly 100 caused by the limiting member, reduce the size of the motor, and reduce the difficulty of assembling the rotor assembly 100.

[0073] Example 2

[0074] Based on the above embodiments, Figures 1 to 8As shown, further, the rotor assembly 100 further includes an axial hole 130 , and the axial hole 130 penetrates through the plurality of rotor punching sheets 110 that are stacked.

[0075] In this embodiment, the rotor assembly 100 is further provided with an axial hole 130 penetrating through the stacked plurality of rotor punchings 110, and the axial hole 130 is used to install the rotating shaft, so that the rotor assembly 100 can be rotated through the rotating shaft. Further, the axial hole 130 is located at the center of the plurality of rotor punchings 110, so that the permanent magnet 120 can be evenly arranged on the circumference of the axial hole 130, that is, the permanent magnet 120 can be located on the circumference of the rotating shaft, and thus during the operation of the rotor assembly 100, the magnetic field generated by the permanent magnet 120 can effectively form electromagnetic induction, thereby ensuring the operation effect and efficiency of the rotor assembly 100.

[0076] Specifically, multiple protrusions 114 can be arranged in a circular shape around the center of the rotor punching 110, and at the same time, the center of the shaft hole 130 is set at the center of the rotor punching 110, that is, the circle surrounded by the multiple protrusions 114 is concentric with the shaft hole 130, so that the multiple protrusions 114 can evenly fix the permanent magnet 120 on the circumference of the rotating shaft, so that the magnetic field generated by the permanent magnet 120 can be evenly distributed on the circumferential side of the rotating shaft, thereby ensuring the electromagnetic induction effect of the magnetic field and improving the operating efficiency of the rotor assembly 100.

[0077] Example 3

[0078] Based on any of the above embodiments, Figure 1 , Figure 2 and Figure 3 , Figure 7 and Figure 8 As shown, further, the protrusion 114 includes a first protrusion 1142 and a second protrusion 1144, wherein the first protrusion 1142 is arranged on the main body 112 corresponding to the first part rotor punching sheet 1102; the second protrusion 1144 is arranged on the main body 112 corresponding to the second part rotor punching sheet 1104, wherein the second protrusion abuts against the end of the permanent magnet 120.

[0079] In this embodiment, the protrusion 114 includes a first protrusion 1142 located on the first rotor sheet 1102 and a second protrusion 1144 located on the second rotor sheet 1104, and the first protrusion 1142 and the second protrusion 1144 are respectively arranged on the body 112 of the rotor sheet 110 corresponding to the first part and the body 112 of the rotor sheet 110 corresponding to the second part. When a plurality of rotor sheets 110 are stacked, the first protrusion 1142 and the second protrusion 1144 are alternately arranged along the axial direction of the rotor assembly 100, so that when a plurality of rotor sheets 110 are stacked, the first protrusion 1142 on the first rotor sheet 1102 and the second protrusion 1144 on the second rotor sheet 1104 can be located in different planes, thereby achieving contact between the end of the permanent magnet 120 and the surface of the second protrusion 1144, so as to achieve fixation of the permanent magnet 120 in the axial direction.

[0080] Furthermore, when installing the permanent magnet 120, the permanent magnet 120 is arranged in the gap between the adjacent multiple first protrusions 1142 of the rotor punching 110. At the same time, along the axial direction of the rotor assembly 100, the second protrusion 1144 is staggered with the first protrusion 1142. Then, the end of the permanent magnet 120 is axially limited by the second protrusion 1144 to achieve the axial fixation of the permanent magnet 120 in the rotor assembly 100, thereby eliminating the need to set limiters at both ends of the rotor assembly 100 and ensuring the axial length of the rotor assembly 100.

[0081] Specifically, multiple rotor punchings 110 can be sequentially inserted into the rotor shaft through the axial hole 130, and then the second part of the rotor punching 1104 provided with the second protrusion 1142 can be rotated so that the first protrusion 1142 and the second protrusion 1144 are staggered, thereby achieving the first protrusion 1142 and the second protrusion 1144 to simultaneously abut against the outer wall of the permanent magnet 120.

[0082] Example 4

[0083] Based on any of the above embodiments, Figure 3 As shown, further, the line between the first point on the first protrusion 1142 and the center point of the shaft hole 130 is the first line 140; the line between the second point on the second protrusion 1144 and the center point of the shaft hole 130 is the second line 150; projecting along the axial direction of the rotor assembly 100, in the obtained projection plane, a first angle is formed between the first line 140 and the second line 150.

[0084] In this embodiment, the first point on the first protrusion 1142 is connected to the center point of the shaft hole 130 to form a first connecting line 140, and at the same time, the second point on the second protrusion 1144 is connected to the center point of the shaft hole 130 to form a second connecting line 150. Further, the rotor assembly 100 is projected along the axial direction, and the positional relationship between the first connecting line 140 and the second connecting line 150 is observed in the obtained projection plane. A first angle is formed between the first connecting line 140 and the second connecting line 150, thereby realizing the staggered arrangement of the first hole and the second protrusion 1144.

[0085] That is, by forming a first angle between the first connecting line 140 and the second connecting line 150, on the basis that the first connecting line 140 passes through the first convex portion 1142 and the second connecting line 150 passes through the second convex portion 1144, it is ensured that the positions of the first convex portion 1142 and the second convex portion 1144 do not overlap, that is, it is ensured that the first convex portion 1142 and the second convex portion 1144 cannot completely overlap, thereby achieving the staggered arrangement of the first convex portion 1142 and the second convex portion 1144. In addition, the opposite side walls of the permanent magnet 120 are respectively abutted against the first convex portions 1142 on both sides, and the end of the permanent magnet 120 can abut against the surface of the second convex portion 1144, thereby achieving the fixing of the permanent magnet 120 in the axial direction of the rotor assembly 100 through the second convex portion 1144.

[0086] Furthermore, the shape and size of the first convex portion 1142 can be set to be the same as the shape and size of the second convex portion 1144. On the one hand, the first convex portion 1142 and the second convex portion 1144 can be processed simultaneously, thereby reducing the processing steps of the rotor assembly 100. On the other hand, it can be ensured that when the first connecting line 140 and the second connecting line 150 form a first angle, that is, when the first convex portion 1142 and the second convex portion 1144 do not overlap, the first convex portion 1142 and the second convex portion 1144 are different in position and angle, thereby ensuring that the first convex portion 1142 and the second convex portion 1144 can be staggered, so that when the permanent magnet 120 is between the adjacent first convex portion 1142, the surface of the second convex portion 1144 can abut against the side wall of the permanent magnet 120, thereby ensuring the fixing effect of the permanent magnet 120.

[0087] Specifically, the first point on the first protrusion can be any point on the circumferential contour line of the first protrusion, and the second point on the second protrusion can be any point on the circumferential contour line of the second protrusion. The first point and the second point are selected from the points at the same position on the first protrusion and the second protrusion. For example, in the clockwise direction, the first point selects the starting point of the first protrusion, and the second point also selects the starting point of the second protrusion; or, the first point selects the midpoint of the first protrusion, and the second point also selects the end point of the second protrusion; or the first point selects the end point of the first protrusion, and the second point also selects the end point of the second protrusion.

[0088] Specifically, the convex portion 114 includes structures such as a convex hull and a convex column. Furthermore, the outer contour of the convex portion 114 may be an arc, a polygon, or the like.

[0089] Furthermore, the first connecting line 140 and the second connecting line 150 may be connecting lines between any point on the convex portion 114 with the same relative position and the center of the axial hole 130. For example, if the convex portion 114 is a convex hull, the vertex of the convex hull and the center of the axial hole 130 may be selected to connect to obtain the first connecting line 140 and the second connecting line 150 respectively; if the convex portion 114 is Figures 1 to 3 For the convex column shown in FIG. 1 , a vertex on the same side of the first convex portion 1142 and the second convex portion 1144 can be selected to connect the center of the shaft hole 130 to obtain the first connecting line 140 and the second connecting line 150 respectively. They are not listed here one by one.

[0090] Further, the value range of the first angle A is greater than 0° and less than or equal to the quotient of 360° and twice the number of pole pairs of the permanent magnet 120 .

[0091] Specifically, by setting the first angle A to be greater than 0°, on the basis that the first connecting line 140 passes through the first protrusion 1142 and the second connecting line 150 passes through the second protrusion 1144, it is ensured that the positions of the first protrusion 1142 and the second protrusion 1144 do not overlap, that is, it is ensured that the first protrusion 1142 and the second protrusion 1144 cannot completely overlap, thereby achieving the first protrusion 1142 and the second protrusion 1144 being staggered, ensuring that the two side walls of the permanent magnet 120 can respectively abut against the outer side walls of the first protrusion 1142, and at the same time, it is also achieved that the end of the permanent magnet 120 abuts against the surface of the second protrusion 1144, thereby ensuring the fixation of the permanent magnet 120.

[0092] Furthermore, on the basis that multiple first protrusions 1142 and multiple second protrusions 1144 are all arranged on the rotor punching 110 in a circular circumferential direction with the center point of the shaft hole 130 as the center point, and the shape and size of the first protrusion 1142 are the same as the shape and size of the second protrusion 1144, by setting the first angle A to be less than or equal to the quotient of 360° and 2 times the number of pole pairs of the permanent magnet 120, it can be ensured that at least a portion of the first protrusion 1142 on the first part of the rotor punching 1102 can be located between two adjacent second protrusions 1144 on the second part of the rotor punching 1104, thereby ensuring that the first protrusion 1142 and the second protrusion 1144 cannot completely overlap, that is, the first protrusion 1142 and the second protrusion 1144 are staggered, thereby ensuring the fixing effect of the permanent magnet 120.

[0093] For example, when the number of pole pairs of the permanent magnet 120 is 5, the value range of the first angle A is greater than 0° and less than or equal to 36°. Specifically, the value of the first angle A may be 18°.

[0094] Furthermore, the structure of the first portion of the rotor punching sheet 1102 is the same as the structure of the second portion of the rotor punching sheet 1104 .

[0095] In this embodiment, by using the same structure for the rotor punchings of the first part and the second part, on the one hand, the rotor punchings are universal, and there is no need to perform a mold opening process for a new structure, thereby reducing production costs. On the one hand, by using the rotor punchings of the same structure, it is only necessary to continue to use the existing rotor punching structure. By using the same rotor punchings, when installing the permanent magnet 120, all the rotor punchings are aligned. After the permanent magnet 120 is installed in place, the second part rotor punching 1104 is rotated so that the convex portion corresponding to the first part rotor punching 1102 is misaligned with the convex portion corresponding to the second part rotor punching 1104, thereby achieving axial positioning of the end of the permanent magnet 120 through the convex portion of the second part rotor punching 1104, thereby eliminating the end stopper, reducing the axial length of the motor, and facilitating the disassembly and maintenance of the rotor.

[0096] Example 5

[0097] Based on any of the above embodiments, Figure 4 , Figure 5 and Figure 6 As shown, further, the multiple rotor punchings also include: a third part rotor punching 1106, the first part rotor punching 1102 is located between the third part rotor punching 1106 and the second part rotor punching 1104; the protrusion 114 also includes a third protrusion 1146, which is arranged on the body 112 corresponding to the third part rotor punching 1106; and, along the axial direction of the rotor assembly 100, the third protrusion 1146 is staggered with the first protrusion 1142 and the second protrusion 1144.

[0098] In this embodiment, a third protrusion 1146 may be further provided on the third portion of some of the rotor punchings 110 in the plurality of rotor punchings 110. That is, the plurality of rotor punchings 110 may be divided into at least three portions, wherein the first portion is provided with the first protrusion 1142, the second portion is provided with the third protrusion 1146, and the third portion is provided with the third protrusion 1146. Further, along the axial direction of the rotor assembly 100, the third protrusion 1146 is alternately arranged with the first protrusion 1142 and the second protrusion 1144. Thus, when the plurality of rotor punchings 110 are stacked, the outer side wall of the first protrusion 1142, the outer side wall of the second protrusion 1144, and the outer side wall of the third protrusion 1146 are not on the same plane.

[0099] Furthermore, when installing the permanent magnet 120, the permanent magnet 120 can be set in the gap between multiple adjacent first protrusions 1142. At the same time, the second protrusions 1144 and the third protrusions 1146 are in an alternating arrangement with the first protrusions 1142, so that the outer wall of the permanent magnet 120 can contact the outer side wall of the adjacent first protrusions 1142, and the end of the permanent magnet 120 is in contact with the surface of the second protrusion 1144 and the surface of the third protrusion 1146, thereby achieving the simultaneous limitation of the permanent magnet 120 from both ends of the permanent magnet 120, thereby improving the stability of the installation of the permanent magnet 120.

[0100] Specifically, the second part and the third part of the rotor punching 110 can be arranged at both ends or the same end of the first part of the rotor punching 110, and the number of the first part rotor punchings 1102 can be set to match the length of the permanent magnet 120, so that the length of the permanent magnet 120 can be adapted to the length of the stacked rotor punchings 110 to ensure that the rotor assembly 100 can achieve the best magnetic flux effect during operation.

[0101] Specifically, the first protrusion 1142, the second protrusion 1144, and the third protrusion 1146 can be set to have the same shape and size, so that the first protrusion 1142, the second protrusion 1144, and the third protrusion 1146 can be manufactured at the same time, reducing the manufacturing process of the rotor assembly 100. Correspondingly, the shapes and sizes of the first protrusion 1142, the second protrusion 1144, and the third protrusion 1146 can be set to be different to meet different operating parameter requirements of the rotor assembly 100.

[0102] Furthermore, if Figure 6 As shown, the line between the third point on the third protrusion 1146 and the center point of the shaft hole 130 is the third line 160; projected along the axial direction of the rotor assembly 100, in the obtained projection plane, a second angle B is formed between the first line 140 and the third line 160.

[0103] Specifically, the third point on the third convex portion 1146 is connected to the center point of the shaft hole 130 to form a third connecting line 160. Furthermore, the rotor assembly 100 is projected along the axial direction, and the positional relationship between the first connecting line 140 and the third connecting line 160 is observed in the obtained projection plane, and a second angle B is formed between the first connecting line 140 and the third connecting line 160, thereby achieving the staggered arrangement of the first convex portion 1142 and the third convex portion 1146.

[0104] That is to say, by forming a second angle B between the first line 140 and the third line 160, on the basis that the first line 140 passes through the first protrusion 1142 and the third line 160 passes through the third protrusion 1146, it is ensured that the positions of the first protrusion 1142 and the third protrusion 1146 do not overlap, that is, it is ensured that the first protrusion 1142 and the third protrusion 1146 cannot completely overlap, thereby realizing the staggered arrangement of the first protrusion 1142 and the third protrusion 1146.

[0105] Furthermore, the value of the first angle A and the value of the second angle B can be set to be different, so that the third protrusion 1146 and the second protrusion 1144 cannot overlap, that is, the third protrusion 1146 and the second protrusion 1144 are staggered to ensure that the permanent magnet 120 can contact the outer wall of the adjacent first protrusion 1142, and at the same time, the two ends of the permanent magnet 120 are respectively in contact with the surfaces of the second protrusion 1144 and the third protrusion 1146 to ensure the fixing effect of the permanent magnet 120.

[0106] Furthermore, the first connecting line 140 and the second connecting line 150 may be connecting lines between any point on the convex portion 114 with the same relative position and the center of the axial hole 130. For example, if the convex portion 114 is a convex hull, the vertex of the convex hull and the center of the axial hole 130 may be selected to connect to obtain the first connecting line 140 and the second connecting line 150 respectively; if the convex portion 114 is Figure 6 For the protrusion shown in , a vertex on the same side of the first protrusion 1142 and the third protrusion 1146 can be selected to connect with the center of the shaft hole 130 to obtain the first connecting line 140 and the second connecting line 150 respectively. They are not listed here one by one.

[0107] Specifically, the first point on the first protrusion 1142 can be any point on the circumferential contour line of the first protrusion 1142, and the third point on the third protrusion 1146 can be any point on the circumferential contour line of the third protrusion 1146. The first point and the third point are selected from points at the same position on the first protrusion 1142 and the third protrusion 1146. For example, in the clockwise direction, the first point selects the starting point of the first protrusion 1142, and the third point also selects the starting point of the third protrusion 1146; or, the first point selects the midpoint of the first protrusion 1142, and the third point also selects the end point of the third protrusion 1146; or the first point selects the end point of the first protrusion 1142, and the third point also selects the end point of the third protrusion 1146.

[0108] Furthermore, the sum of the first angle A and the second angle B has a value range of greater than 0° and less than or equal to the quotient of 360° and twice the number of pole pairs of the permanent magnet 120 .

[0109] Specifically, by setting the value of the sum of the first angle A and the second angle B to be greater than 0°, on the basis that the first line 140 passes through the first protrusion 1142, the second line 150 passes through the second protrusion 1144, and the third line 160 passes through the third protrusion 1146, it is ensured that the positions of the first protrusion 1142, the second protrusion 1144 and the third protrusion 1146 do not overlap, that is, it is ensured that the first protrusion 1142, the second protrusion 1144 and the third protrusion 1146 cannot completely overlap, thereby achieving the staggered arrangement of the first protrusion 1142, the second protrusion 1144 and the third protrusion 1146, ensuring that the side wall of the permanent magnet 120 can contact the side wall of the adjacent first protrusion 1142, and at the same time, the two ends of the permanent magnet 120 can simultaneously contact the surfaces of the second protrusion 1144 and the third protrusion 1146, so as to improve the fixing effect of the permanent magnet 120.

[0110] Furthermore, by setting the sum of the first angle A and the second angle B to be less than or equal to the quotient of 360° and 2 times the number of pole pairs of the permanent magnet 120. On the basis that the first convex portion 1142, the second convex portion 1144 and the third convex portion 1146 are all arranged on the rotor punching 110 in a circular circumferential direction with the center point of the shaft hole 130 as the center point, and the first convex portion 1142, the second convex portion 1144 and the third convex portion 1146 are all the same in shape and size, it is ensured that the sum of the first angle A and the second angle is between 0° and 360° and 2 times the number of pole pairs of the permanent magnet 120, so that the first convex portion 1142 on the first part of the rotor punching 110 can be It is located between two adjacent second protrusions 1144 of the second part rotor punching sheet 1104, and at least a portion of the first protrusion 1142 can also be located between two adjacent third protrusions 1146 of the third part rotor punching sheet 1106, thereby ensuring that the first protrusion 1142, the second protrusion 1144 and the third protrusion 1146 cannot completely overlap, that is, the staggered arrangement of the first protrusion 1142, the second protrusion 1144 and the third protrusion 1146 is achieved, thereby ensuring the fixing effect of the permanent magnet 120.

[0111] Furthermore, the structure of the third portion of rotor punchings 1106 is the same as the structure of the first portion of rotor punchings 1102 .

[0112] In this embodiment, by using the same structure for the first rotor punching sheet 1102 and the third rotor punching sheet 1106, on the one hand, the rotor punching sheet is universal, and there is no need to perform a mold opening process for a new structure, thereby reducing production costs. On the one hand, by using rotor punching sheets with the same structure, it is only necessary to continue to use the existing rotor punching sheet structure. By using the same rotor punching sheet, when installing the permanent magnet 120, all the rotor punching sheets are aligned. After the permanent magnet 120 is installed in place, the third rotor punching sheet 1106 is rotated so that the convex portion corresponding to the first rotor punching sheet 1102 and the convex portion corresponding to the third rotor punching sheet 1106 are misaligned, thereby achieving axial positioning of the end of the permanent magnet 120 through the convex portion of the third rotor punching sheet 1106, thereby eliminating the end stopper, reducing the axial length of the motor, and facilitating the disassembly and maintenance of the rotor.

[0113] For example, when the pole pair number of the permanent magnet 120 is 5, the sum of the first angle A and the second angle B is greater than 0° and less than or equal to 36°. Specifically, the sum of the first angle A and the second angle B can be 36°.

[0114] Example 6

[0115] Based on any of the above embodiments, Fig. 9 As shown, the rotor assembly 100 further includes a fixing member 170 , and the fixing member 170 is sleeved on the outer side of the permanent magnet 120 .

[0116] In this embodiment, the rotor assembly 100 may also be provided with a fixing member 170, which is sleeved on the outside of the permanent magnet 120, so as to fix the permanent magnet 120 in the radial direction of the rotor assembly 100 and prevent the permanent magnet 120 from falling off. By providing the fixing member 170, in conjunction with the convex portion 114 provided on the side wall of the body 112 of the rotor sheet 110, the permanent magnet 120 is fixed in the axial direction and in the radial direction of the rotor sheet 110 when it is installed on the rotor sheet 110, thereby ensuring the stability of the installation of the permanent magnet 120 and further ensuring the stable operation of the rotor assembly 100.

[0117] Specifically, the fixing member 170 may be a non-metallic annular structure to prevent the metal material from affecting the magnetic flux of the rotor assembly 100 during operation.

[0118] Furthermore, the permanent magnets 120 include N-pole permanent magnets and S-pole permanent magnets, and along the circumferential direction of the rotor assembly 100 , the N-pole permanent magnets and the S-pole permanent magnets are alternately arranged on the circumferential side wall of the rotor punching 110 .

[0119] Specifically, by setting the permanent magnets 120 as N-pole permanent magnets and S-pole permanent magnets, and staggering the N-pole permanent magnets and the S-pole permanent magnets along the circumferential direction of the rotor assembly 100 and on the side walls of the rotor punching 110 body 112, it is ensured that the two adjacent permanent magnets 120 of the N-pole permanent magnets are both S-pole permanent magnets, and the two adjacent permanent magnets 120 of the S-pole permanent magnets are both N-pole permanent magnets, so that the adjacent S-pole permanent magnets and N-pole permanent magnets cooperate with each other to ensure the uniformity of the magnetic field strength and the distribution of magnetic flux lines between the two, thereby ensuring the stable operation of the rotor assembly 100.

[0120] Furthermore, the structure of the permanent magnet 120 can be selected and designed according to specific needs, such as Figure 7 and Figure 8 Permanent magnets with different structures are shown respectively to meet the needs of different scenarios.

[0121] Example 7

[0122] According to a second aspect of the present invention, Fig. 9 As shown, a rotor 200 is proposed, comprising: a rotor assembly 100 as in any one of the above embodiments.

[0123] The rotor 200 provided by the present invention includes the rotor assembly 100 as in any one of the above embodiments. Therefore, the rotor 200 has all the beneficial effects of the rotor assembly 100 proposed in the first aspect, which will not be described in detail here.

[0124] Furthermore, the rotor 200 further includes a rotating shaft 220 , which is disposed in the shaft hole 130 of the rotor assembly 100 .

[0125] Specifically, by disposing the rotating shaft 220 in the shaft hole 130 of the rotor assembly 100 , the rotor 200 as a whole can stably rotate around the rotating shaft 220 , thereby driving the multiple permanent magnets 120 in the rotor assembly 100 to rotate, thereby achieving stable operation of the rotor 200 .

[0126] Specifically, multiple protrusions 114 can be arranged in a circular shape around the center of the rotor punching 110, and at the same time, the center of the shaft hole 130 is set at the center of the rotor punching 110, that is, the circle surrounded by the multiple protrusions 114 is concentric with the shaft hole 130, so that the multiple protrusions 114 can evenly fix the permanent magnet 120 on the circumference of the rotating shaft 220, so that the magnetic field generated by the permanent magnet 120 can be evenly distributed on the circumferential side of the rotating shaft 220, thereby ensuring the electromagnetic induction effect of the magnetic field and improving the operating efficiency of the rotor assembly 100.

[0127] Specifically, multiple rotor punchings 110 can be sequentially inserted into the rotating shaft 220 of the rotor 200 through the axial hole 130, and then the first part of the rotor punching 1102 provided with the first protrusion 1142 is rotated so that the first protrusion 1142 and the second protrusion 1144 are alternately arranged, thereby achieving the first protrusion 1142 and the second protrusion 1144 to simultaneously abut against the outer wall of the permanent magnet 120.

[0128] Example 8

[0129] According to a third aspect of the present invention, a motor is provided, comprising: a rotor 200 as in any one of the above embodiments.

[0130] The motor provided by the present invention includes the rotor 200 as in any one of the above technical solutions. Therefore, the motor has all the beneficial effects of the rotor 200 proposed in any one of the above embodiments, which will not be described in detail here.

[0131] In the present invention, the term "plurality" refers to two or more than two, unless otherwise clearly defined. The terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; "connected" can be a direct connection or an indirect connection through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0132] In the description of this specification, the description of the terms "one embodiment", "some embodiments", "specific embodiments", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0133] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A rotor assembly, characterized in that: include: A plurality of rotor punchings, wherein the plurality of rotor punchings are stacked and include a first portion of rotor punchings and a second portion of rotor punchings, wherein the second portion of rotor punchings is located at an end of the first portion of rotor punchings along the axial direction of the rotor assembly; A permanent magnet is disposed on the plurality of rotor punchings; The rotor punching sheet comprises: ontology; A convex portion, the convex portion being arranged on a side wall of the body; Wherein, the convex portion corresponding to the first part of the rotor punching sheet and the convex portion corresponding to the second part of the rotor punching sheet are arranged in a staggered manner; The convex portion comprises: A first convex portion is provided on the body corresponding to the first part of the rotor punching sheet; A second convex portion is provided on the body corresponding to the second portion of the rotor punching sheet; The plurality of rotor punchings also include: a third portion of rotor punchings, wherein the second portion of rotor punchings is located between the third portion of rotor punchings and the first portion of rotor punchings; The convex portion further comprises: A third convex portion is provided on the body corresponding to the third portion of the rotor punching sheet; Wherein, along the axial direction of the rotor assembly, the third protrusion is arranged alternately with the first protrusion and the second protrusion; The ends of the permanent magnet abut against the surface of the second convex portion and the surface of the third convex portion.

2. The rotor assembly according to claim 1, characterized in that Also includes: The shaft hole penetrates through the plurality of rotor punching sheets stacked together.

3. The rotor assembly according to claim 2, characterized in that A line connecting the first point on the first convex portion and the center point of the axial hole is a first connecting line; The line connecting the second point on the second convex portion and the center point of the axial hole is the second connecting line; Projecting along the axial direction of the rotor assembly, in the obtained projection plane, a first angle is formed between the first connecting line and the second connecting line.

4. The rotor assembly according to claim 3, characterized in that: The value range of the first angle is greater than 0° and less than or equal to the quotient of 360° and 2 times the number of pole pairs of the permanent magnet.

5. The rotor assembly according to claim 1, characterized in that: The structure of the first portion of rotor punchings is the same as the structure of the second portion of rotor punchings.

6. The rotor assembly according to claim 3, characterized in that: The line between the third point of the third protrusion and the center point of the axial hole is the third line; Projecting along the axial direction of the rotor assembly, in the obtained projection plane, a second angle is formed between the first connecting line and the third connecting line.

7. The rotor assembly according to claim 6, characterized in that The value range of the sum of the first angle and the second angle is: greater than 0° and less than or equal to the quotient of 360° and 2 times the number of pole pairs of the permanent magnet.

8. The rotor assembly according to claim 3, characterized in that: The structure of the third portion of rotor punchings is the same as that of the first portion of rotor punchings.

9. The rotor assembly according to any one of claims 1 to 8, characterized in that: Also includes: A fixing piece is sleeved on the outer side of the permanent magnet.

10. The rotor assembly according to any one of claims 1 to 8, characterized in that: The permanent magnet comprises: The N-pole permanent magnet and the S-pole permanent magnet are alternately arranged on the circumferential side wall of the rotor punching sheet along the circumferential direction of the rotor assembly.

11. A rotor, characterized in that: include: A rotor assembly as claimed in any one of claims 1 to 10.

12. The rotor according to claim 11, characterized in that Also includes: A rotating shaft is arranged in the shaft hole of the rotor assembly.

13. A motor, characterized in that: include: A rotor as claimed in claim 11 or 12.

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