Rotor and electric machine

Abstract

The application discloses a rotor and a motor. The rotor comprises a core assembly, two outer end rings, a bar and two inner end rings. The core assembly is composed of a plurality of stacked laminations. The core assembly has a first end and a second end. The end face of the first end has a through slot extending to the second end. The end face of the first end and the end face of the second end both have embedding holes. The two embedding holes are arranged at intervals. The embedding holes are arranged at intervals with the through slot. The two outer end rings are respectively located at the first end and the second end. The bar is arranged in the through slot. The two ends of the bar are respectively connected to the two outer end rings. Each inner end ring is located at the inner side of one outer end ring. Each inner end ring has an embedding part at one end facing the other inner end ring. Each embedding part is embedded in one embedding hole. The technical scheme improves the strength of the rotor, is more beneficial to be applied in a high-speed scene, and reduces the material cost and the installation process of the rotor.

Description

Technical Field

[0001] This invention relates to the field of power equipment technology, and in particular to a rotor and a motor. Background Technology

[0002] Unlike industrial asynchronous motors, new energy vehicle asynchronous motors have high speed requirements, with a maximum speed of 16,000 rpm or even more than 18,000 rpm. In addition, the operating conditions of new energy vehicle motors are complex, often involving variable speed and load. The rotor must withstand the alternating shock of hot and cold due to rotor heating. Under the dual action of high-speed centrifugal force and temperature rise load, the strength requirements for the rotor are high.

[0003] In existing technologies, steel sleeves or steel plates are usually added to improve the strength of the rotor; however, this undoubtedly increases material costs and installation procedures. Summary of the Invention

[0004] The main objective of this invention is to propose a rotor that improves rotor strength to facilitate its application in high-speed scenarios and reduces rotor material costs and installation procedures.

[0005] To achieve the above objectives, the present invention provides a rotor comprising:

[0006] A core assembly, comprising a plurality of stacked laminations, having a first end and a second end, the end face of the first end having a through groove extending to the second end, and both the end face of the first end and the end face of the second end having fitting holes, the two fitting holes being spaced apart, and the fitting holes being spaced apart from the through groove.

[0007] Two outer end rings, the two outer end rings being located at the first end and the second end respectively;

[0008] A guide bar, which passes through the through groove and whose two ends are respectively connected to the two outer end rings;

[0009] Two inner end rings, each inner end ring being located inside one of the outer end rings, and each inner end ring having a fitting portion at one end facing the other inner end ring, each fitting portion being fitted into a fitting hole.

[0010] In one embodiment of the present invention, the fitting portion includes a first boss and a second boss, the first boss and the second boss are stacked together along the end of the iron core assembly toward the center, and the first boss and the second boss are offset in the circumferential direction of the inner end ring.

[0011] The fitting hole includes a first fitting hole and a second fitting hole. The first fitting hole and the second fitting hole are arranged sequentially along the end of the iron core assembly towards the center. The first fitting hole and the second fitting hole are offset from each other in the circumferential direction of the iron core assembly and are interconnected. The first boss is fitted into the first fitting hole and the second boss is fitted into the second boss.

[0012] In one embodiment of the present invention, the first boss and the second boss constitute a fitting unit, and a plurality of fitting units are provided, the plurality of fitting units being spaced apart along the circumference of the inner end ring; the first fitting hole and the second fitting hole constitute a fitting hole unit, the plurality of fitting hole units being spaced apart along the circumference of the core assembly; each fitting unit is fitted into a fitting hole unit.

[0013] In one embodiment of the present invention, two adjacent interlocking units are connected to each other.

[0014] In one embodiment of the present invention, the core assembly includes a first core, two second cores and two third cores arranged coaxially. The two second cores are respectively disposed at both ends of the first core. Each third core is disposed at the end of a second core away from the first core. The end of one third core away from the second core has the first end, and the end of the other third core away from the second core has the second end. The first core, the second core and the third core are all composed of a plurality of stacked laminations.

[0015] The third iron core has the first fitting hole, and the second iron core has the second fitting hole.

[0016] In one embodiment of the present invention, the fitting hole is an oblong hole, which extends circumferentially along the core assembly.

[0017] In one embodiment of the present invention, the width of the through groove gradually decreases from the edge of the core assembly toward the center; the width of the guide bar gradually decreases from the edge of the core assembly toward the center.

[0018] In one embodiment of the present invention, the through groove extends spirally from the first end to the second end; the guide bar extends spirally from the first end to the second end.

[0019] In one embodiment of the present invention, in the outer end ring and the inner end ring located on the same side of the core assembly, the end face of the outer end ring facing away from the core assembly protrudes beyond the end face of the inner end ring facing away from the core assembly.

[0020] And / or, multiple through slots and guide bars are provided, with multiple through slots spaced apart circumferentially along the core assembly, and multiple guide bars spaced apart circumferentially along the core assembly, with each guide bar passing through one of the through slots;

[0021] And / or, the outer end ring, the guide bar, and the inner end ring are integrally cast.

[0022] The present invention also proposes an electric motor, including a rotor, the rotor comprising:

[0023] A core assembly, comprising a plurality of stacked laminations, having a first end and a second end, the end face of the first end having a through groove extending to the second end, and both the end face of the first end and the end face of the second end having fitting holes, the two fitting holes being spaced apart, and the fitting holes being spaced apart from the through groove.

[0024] Two outer end rings, the two outer end rings being located at the first end and the second end respectively;

[0025] A guide bar, which passes through the through groove and whose two ends are respectively connected to the two outer end rings;

[0026] Two inner end rings, each inner end ring being located inside one of the outer end rings, and each inner end ring having a fitting portion at one end facing the other inner end ring, each fitting portion being fitted into a fitting hole.

[0027] The rotor of this invention can be directly cast onto the core assembly to form two outer end rings, guide bars, and two inner end rings. The two outer end rings are positioned at the first and second ends of the core assembly, respectively. The guide bars pass through slots in the core assembly, with both ends connected to the two outer end rings. This combination of guide bars and slots increases the strength of the core assembly and reduces the outward strain of the outer end rings under centrifugal and temperature rise loads, thereby improving the rotor's strength. Simultaneously, by embedding the fitting portions of the two inner end rings into the two fitting holes of the core assembly, the fitting portions can achieve [the desired effect]. With the cooperation of the fitting hole, the axial constraint on the inner end ring is increased, thereby reducing the outward strain of the inner end ring under centrifugal load and temperature rise load, so as to further improve the strength of the rotor and make it more suitable for high-speed application. In this way, there is no need to add steel sleeves or steel plates to improve the strength of the rotor. Instead, the corresponding guide bars and fitting parts can be formed directly in the through groove and fitting hole when forming the outer end ring and the inner end ring, respectively. There is no need to form the outer end ring and the inner end ring on the iron core assembly and then add steel sleeves or steel plates by welding or other methods, thereby reducing the material cost and installation process of the rotor. Attached Figure Description

[0028] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0029] Figure 1 This is a schematic diagram of the structure of one embodiment of the rotor of the present invention;

[0030] Figure 2 This is a schematic diagram of the structure of the first rotor core in one embodiment of the rotor of the present invention;

[0031] Figure 3 This is a schematic diagram of the structure of the second or third rotor core in one embodiment of the rotor of the present invention;

[0032] Figure 4 This is a schematic diagram of the structure of the cast locking component in one embodiment of the rotor of the present invention;

[0033] Figure 5 This is a partial structural schematic diagram of the cast locking component in one embodiment of the rotor of the present invention.

[0034] Explanation of icon numbers:

[0035] label name label name 100 rotor 13 Third iron core 10 Iron core assembly 20 Casting locking parts 10a First end 21 outer ring 10b Second end 22 guide bar 10c Through slot 23 Inner ring 10d Fitting hole 231 chimeric part 11 First Iron Core 2311 First protrusion 12 Second iron core 2312 Second protrusion

[0036] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0037] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0038] It should be noted that if the embodiments of the present invention involve directional indication, the directional indication is only used to explain the relative positional relationship and movement of the components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0039] Furthermore, if the embodiments of this invention involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. If the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0040] This invention proposes a rotor 100, which aims to reduce the material cost and installation process of the rotor 100.

[0041] The specific structure of the rotor 100 of the present invention will be described below:

[0042] See also Figures 1 to 5 In one embodiment of the rotor 100 of the present invention, the rotor 100 includes a core assembly 10, two outer end rings 21, guide bars 22, and two inner end rings 23; the core assembly 10 is composed of a plurality of stacked laminations, the core assembly 10 having a first end 10a and a second end 10b, the end face of the first end 10a having a through groove 10c extending to the second end 10b, and both the end face of the first end 10a and the end face of the second end 10b having fitting holes 10d, the two fitting holes 10d being fitted together. The fitting holes 10d are spaced apart, and the fitting holes 10d and the through grooves 10c are spaced apart; the two outer end rings 21 are located at the first end 10a and the second end 10b, respectively; the guide strip 22 passes through the through groove 10c, and the two ends of the guide strip 22 are respectively connected to the two outer end rings 21; each inner end ring 23 is located inside an outer end ring 21, and each inner end ring 23 has a fitting part 231 at one end facing the other inner end ring 23, and each fitting part 231 is fitted into a fitting hole 10d.

[0043] It is understood that the rotor 100 of the present invention can be directly formed on the core assembly 10 by casting to form two outer end rings 21, guide bars 22, and two inner end rings 23, so that the two outer end rings 21 are respectively located at the first end 10a and the second end 10b of the core assembly 10, and the guide bars 22 pass through the through slots 10c on the core assembly 10, with both ends of the guide bars 22 connected to the two outer end rings 21. This combination of the guide bars 22 and the through slots 10c increases the strength of the core assembly 10 and reduces the outward strain of the outer end rings 21 under centrifugal load and temperature rise load, thereby improving the strength of the rotor 100. Simultaneously, by embedding the fitting portions 231 on the two inner end rings 23 into the two fitting holes 10 of the core assembly 10, the strength of the rotor 100 is enhanced. Within d, the inner end ring 23 can be constrained in the axial direction by the cooperation of the fitting part 231 and the fitting hole 10d, thereby reducing the outward strain of the inner end ring 23 under centrifugal load and temperature rise load, so as to further improve the strength of the rotor 100 and make it more suitable for high-speed application. In this way, there is no need to add steel sleeves or steel plates to improve the strength of the rotor 100. Instead, when forming the outer end ring 21 and the inner end ring 23, the corresponding guide bar 22 and fitting part 231 can be formed directly in the through groove 10c and the fitting hole 10d, respectively. There is no need to form the outer end ring 21 and the inner end ring 23 on the core assembly 10 and then add steel sleeves or steel plates by welding or other means, thereby reducing the material cost and installation process of the rotor 100.

[0044] In this embodiment, the core assembly 10 has a shaft hole extending from the first end 10a to the second end 10b in the middle, and the shaft hole is used to install a rotating shaft.

[0045] In some embodiments, the conductor strip 22 may be a copper conductor strip 22, an aluminum conductor strip 22, or a copper-aluminum hybrid conductor strip 22.

[0046] In some embodiments, the outer end ring 21, the inner end ring 23, the guide bar 22, and the fitting part 231 are integrally cast to form a cast locking part 20. Specifically, the iron core assembly 10 can be placed in a mold, and the outer end ring 21, the inner end ring 23, the guide bar 22, and the fitting part 231 can be formed simultaneously by casting to form a squirrel cage rotor 100. In some embodiments, centrifugal casting can be used to reduce the porosity of the squirrel cage rotor 100, so that the rotor 100 has a good dynamic balance effect.

[0047] Furthermore, in conjunction with reference Figures 3 to 5In one embodiment, the fitting portion 231 includes a first boss 2311 and a second boss 2312, which are stacked together along the end of the core assembly 10 toward the center, and the first boss 2311 and the second boss 2312 are offset in the circumferential direction of the inner end ring 23; the fitting hole 10d includes a first fitting hole and a second fitting hole, which are arranged sequentially along the end of the core assembly 10 toward the center, and the first fitting hole and the second fitting hole are offset in the circumferential direction of the core assembly 10 and communicate with each other, the first boss 2311 is fitted into the first fitting hole, and the second boss 2312 is fitted into the second boss 2312.

[0048] This configuration not only increases the axial constraint on the inner end ring 23 through the cooperation of the first boss 2311 and the first fitting hole, but also allows at least a portion of the second boss 2312 to abut against the lamination of the core assembly 10 with the first fitting hole, so that the fitting portion 231 between the inner end ring 23 and the core assembly 10 forms an interlocking structure, thereby significantly increasing the axial constraint on the inner end ring 23.

[0049] Furthermore, in order to improve the balancing force of the inner end ring 23 in the axial direction, so as to achieve better dynamic balance of the rotor 100, and further reduce the outward strain of the inner end ring 23 under centrifugal load and temperature rise load, thereby improving the strength of the rotor 100, refer to [reference needed]. Figures 3 to 5 In one embodiment, the first boss 2311 and the second boss 2312 constitute a fitting unit, and multiple fitting units can be provided, with the multiple fitting units spaced apart circumferentially along the inner end ring 23; the first fitting hole and the second fitting hole constitute a fitting hole 10d unit, and multiple fitting hole 10d units can be provided, with the multiple fitting hole 10d units spaced apart circumferentially along the core assembly 10; each fitting unit is fitted into a fitting hole 10d unit; that is, multiple first bosses 2311 and second bosses 2312 can be provided, with the multiple first bosses 2311 spaced apart circumferentially along the inner end ring 23. Multiple second protrusions 2312 are spaced apart along the circumference of the inner end ring 23, and each first protrusion 2311 and a second protrusion 2312 are offset in the circumferential direction of the inner end ring 23; and multiple first fitting holes and multiple second fitting holes are provided, with multiple first fitting holes spaced apart along the circumferential direction of the core assembly 10, and multiple second fitting holes spaced apart along the circumferential direction of the core assembly 10, with each first fitting hole and a second fitting hole offset in the circumferential direction of the core assembly 10; so that each first protrusion 2311 is fitted into a first fitting hole, and each second protrusion 2312 is fitted into a second fitting hole.

[0050] Furthermore, in conjunction with reference Figure 5In one embodiment, two adjacent fitting units are connected to each other; this arrangement can further enhance the balancing force of the inner end ring 23 in the axial direction by connecting two adjacent fitting units to each other.

[0051] Furthermore, in some embodiments, in order to better form the misaligned first and second fitting holes in the core assembly 10, the core assembly 10 can include a first core 11, two second cores 12, and two third cores 13 arranged coaxially, such that the two second cores 12 are respectively disposed at both ends of the first core 11, and each third core 13 is disposed at the end of a second core 12 away from the first core 11. The end of one third core 13 away from the second core 12 has a first end 10a, and the end of the other third core 13 away from the second core 12 has a second end 10b. The first core 11, the second core 12, and the third core 13 are all composed of a plurality of stacked laminations. The third core 13 has a first fitting hole, and the second core 12 has a second fitting hole.

[0052] Specifically, before assembly, a first fitting hole can be formed on the third iron core 13 by drilling or direct casting, and a second fitting hole can be formed on the second iron core 12 by drilling or direct casting. During assembly, the third iron core 13 is first stacked on the end of the second iron core 12 away from the first iron core 11, and the first fitting hole on the third iron core 13 is first aligned with the first fitting hole on the second iron core 12. Then, the third iron core 13 is rotated at a certain angle relative to the second iron core 12, so that the first fitting hole on the third iron core 13 and the second fitting hole on the second iron core 12 are misaligned.

[0053] Furthermore, in conjunction with reference Figure 3 In one embodiment, the fitting hole 10d is a waist-shaped hole that extends circumferentially along the core assembly 10. Correspondingly, the fitting part 231 is also a waist-shaped structure that matches the waist-shaped hole. With this configuration, the balancing force constraining the inner end ring 23 in the axial direction can be improved by the cooperation between the fitting part 231 and the fitting hole 10d, so that the dynamic balance of the rotor 100 is good.

[0054] Specifically, the long axis of the oblong hole can be fitted with a concentric circle of the core assembly 10, that is, the long axis of the oblong hole is an arc segment structure; or, the long axis of the oblong hole can also be tangent to a concentric circle of the core assembly 10, that is, the long axis of the oblong hole is a straight segment structure.

[0055] Of course, in other embodiments, the fitting hole 10d can also be a strip-shaped, wavy, spherical, or other opening structure. Specifically, when the fitting hole 10d includes a first fitting hole on the third iron core 13 and a second fitting hole on the second iron core 12, both the first fitting hole and the second fitting hole can be oblong holes, or they can both be opening structures of other shapes. Of course, the first fitting hole and the second fitting hole can also be opening structures of different shapes, as long as the first fitting hole and the second fitting hole are interconnected. In this way, during the casting process, the molten material can flow through the first fitting hole into the second fitting hole to form the first boss 2311 and the second boss 2312 in the first fitting hole and the second fitting hole, respectively.

[0056] Furthermore, in conjunction with reference Figure 2 , Figure 3 and Figure 5 In one embodiment, the width of the through groove 10c gradually decreases from the edge of the core assembly 10 toward the center; the width of the guide bar 22 gradually decreases from the edge of the core assembly 10 toward the center; this arrangement can reduce the stress in the joint area between the outer end ring 21 and the guide bar 22, so as to ensure the strength of the rotor 100.

[0057] In some embodiments, in order to further reduce the stress in the area where the outer end ring 21 and the guide bar 22 are joined, the groove wall of the through groove 10c near the outer edge of the core assembly 10 can be an arc-shaped groove wall, and the arc-shaped groove wall can fit a concentric circle of the core assembly 10; in addition, the groove wall of the through groove 10c near the middle of the core assembly 10 can also be an arc-shaped groove wall.

[0058] Furthermore, in order to further reduce the outward strain of the outer end ring 21 under centrifugal load and temperature rise load, thereby further improving the strength of the rotor 100 and achieving better dynamic balance of the rotor 100, in conjunction with reference to... Figures 2 to 5 In one embodiment, multiple through slots 10c and guide bars 22 may be provided. Multiple through slots 10c are spaced apart along the circumference of the core assembly 10, and multiple guide bars 22 are spaced apart along the circumference of the core assembly 10, so that each guide bar 22 passes through a through slot 10c.

[0059] In some embodiments, the through slot 10c is a closed slot, that is, the through slot 10c is not connected to the outer wall of the iron core assembly 10, and the through slot 10c is not connected to the shaft hole in the middle of the iron core assembly 10. In this way, the rotor 100 can have smaller harmonics and better NVH performance, thereby ensuring the comfort of the motor.

[0060] Furthermore, in conjunction with reference Figure 5In one embodiment, the through groove 10c extends spirally from the first end 10a to the second end 10b; the guide bar 22 extends spirally from the first end 10a to the second end 10b; that is, in the core assembly 10 composed of several laminations, adjacent laminations have the same central rotation angle in the direction from the first end 10a to the second end 10b, so that the through groove 10c extends spirally in the direction from the first end 10a to the second end 10b to form a spiral groove; for example, based on the first lamination located at the first end 10a, the second lamination adjacent to the first lamination rotates 0.1 degrees clockwise relative to the first lamination, the third lamination adjacent to the second lamination also rotates 0.1 degrees clockwise relative to the second lamination, and so on.

[0061] This configuration not only increases the starting torque of the rotor 100, allowing it to rotate smoothly, but also reduces or eliminates fluctuations in the rotor 100 during rotation, making it run more smoothly and thus improving the comfort of the motor.

[0062] Furthermore, in conjunction with reference Figure 1 and Figure 4 In one embodiment, in the outer end ring 21 and the inner end ring 23 located on the same side of the core assembly 10, the end face of the outer end ring 21 facing away from the core assembly 10 protrudes beyond the end face of the inner end ring 23 facing away from the core assembly 10. This arrangement can reduce the outward strain of the inner end ring 23 and the outer end ring 21 under centrifugal load and temperature rise load, so as to ensure the strength of the rotor 100.

[0063] Furthermore, in conjunction with reference Figure 4 and Figure 5 In one embodiment, the outer end ring 21, the inner end ring 23, the guide bar 22, and the fitting part 231 are integrally cast structures. With this configuration, the iron core assembly 10 can be placed in a mold, and the outer end ring 21, the inner end ring 23, the guide bar 22, and the fitting part 231 can be formed simultaneously by casting, thereby forming the squirrel cage rotor 100. In some embodiments, centrifugal casting can be used to reduce the porosity of the squirrel cage rotor 100, so that the rotor 100 has a good dynamic balance effect.

[0064] The present invention also proposes an electric motor, which includes a rotor 100 as described above, the specific structure of which is detailed in the foregoing embodiments. Since this electric motor adopts all the technical solutions of the foregoing embodiments, it possesses at least all the beneficial effects brought about by all the technical solutions of the foregoing embodiments, which will not be elaborated upon here.

[0065] The above description is merely a preferred embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural transformations made using the contents of the present invention's specification and drawings under the inventive concept of the present invention, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. A rotor, characterized in that, include: A core assembly, comprising a plurality of stacked laminations, having a first end and a second end, the end face of the first end having a through groove extending to the second end, and both the end face of the first end and the end face of the second end having fitting holes, the two fitting holes being spaced apart, and the fitting holes being spaced apart from the through groove. Two outer end rings, the two outer end rings being located at the first end and the second end respectively; A guide bar, which passes through the through groove and whose two ends are respectively connected to the two outer end rings; Two inner end rings, each inner end ring being located inside one of the outer end rings, and each inner end ring having a fitting portion at one end facing the other inner end ring, each fitting portion being fitted into a fitting hole; The fitting part includes a first boss and a second boss, which are stacked together along the end of the core assembly toward the center, and the first boss and the second boss are offset in the circumferential direction of the inner end ring. The fitting holes include a first fitting hole and a second fitting hole. The first fitting hole and the second fitting hole are arranged sequentially from the end of the iron core assembly toward the center. The first fitting hole and the second fitting hole are offset from each other in the circumferential direction of the iron core assembly and are interconnected. The first boss is fitted into the first fitting hole and the second boss is fitted into the second fitting hole.

2. The rotor as claimed in claim 1, characterized in that, The first boss and the second boss constitute a fitting unit, and there are multiple fitting units, which are spaced apart along the circumference of the inner end ring; the first fitting hole and the second fitting hole constitute a fitting hole unit, and there are multiple fitting hole units, which are spaced apart along the circumference of the core assembly; each fitting unit is fitted into a fitting hole unit.

3. The rotor as described in claim 2, characterized in that, The two adjacent interlocking units are connected to each other.

4. The rotor as claimed in claim 1, characterized in that, The core assembly includes a first core, two second cores, and two third cores arranged coaxially. The two second cores are respectively located at both ends of the first core. Each third core is located at the end of a second core away from the first core. The end of one third core away from the second core has the first end, and the end of the other third core away from the second core has the second end. The first core, the second cores, and the third cores are all composed of several stacked laminations. The third iron core has the first fitting hole, and the second iron core has the second fitting hole.

5. The rotor as described in any one of claims 1 to 4, characterized in that, The fitting hole is an oblong hole, which extends circumferentially along the core assembly.

6. The rotor as claimed in any one of claims 1 to 4, characterized in that, The width of the through groove gradually decreases from the edge of the core assembly towards the center; the width of the guide bar gradually decreases from the edge of the core assembly towards the center.

7. The rotor as claimed in any one of claims 1 to 4, characterized in that, The through groove extends spirally from the first end to the second end; the guide bar extends spirally from the first end to the second end.

8. The rotor as claimed in any one of claims 1 to 4, characterized in that, In the outer end ring and the inner end ring located on the same side of the core assembly, the end face of the outer end ring facing away from the core assembly protrudes beyond the end face of the inner end ring facing away from the core assembly. And / or, multiple through slots and guide bars are provided, with multiple through slots spaced apart circumferentially along the core assembly, and multiple guide bars spaced apart circumferentially along the core assembly, with each guide bar passing through one of the through slots; And / or, the outer end ring, the guide bar, and the inner end ring are integrally cast.

9. An electric motor, characterized in that, Includes a rotor as described in any one of claims 1 to 8.

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