Motor rotor and motor

Abstract

The present invention discloses a motor rotor and a motor, wherein the motor rotor comprises: an iron core assembly, wherein two end rings are respectively provided at both ends of the iron core assembly, the iron core assembly comprises a plurality of iron core rings arranged in sequence along its axial direction, the end rings abutting against the iron core rings arranged near them, each iron core ring is provided with a guide groove, and the plurality of guide grooves of all the iron core rings are sequentially connected to form a channel; a guide bar, wherein the guide bar is passed through the channel to pass through the iron core assembly, and the two ends of the guide bar are respectively connected to the two end rings, and bosses are formed on the guide bar at positions corresponding to the guide grooves; the end rings and the bosses arranged near them, and any two adjacent bosses are interconnected and staggered along the radial and / or circumferential directions of the iron core assembly to form a stepped structure, and the stepped surface of the stepped structure abuts against the end face of the iron core ring on the same side thereof. The abutting surfaces between the iron core assembly of the motor rotor of the present invention and the guide bars and the end rings generate friction, eliminating the risk of the guide bars breaking, so that the motor rotor can adapt to higher speed working conditions.

Description

Technical Field

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

[0002] The squirrel-cage motor rotor is a key component in asynchronous motors and is widely used in the industrial sector. With the booming new energy vehicle industry and rising prices for rare earth raw materials, squirrel-cage motor rotor asynchronous motors are becoming increasingly popular as main or auxiliary drive motors. Unlike industrial asynchronous motors, asynchronous motors in new energy vehicles require higher speeds, reaching maximum speeds of 16,000 rpm or even exceeding 18,000 rpm. Furthermore, new energy vehicle motors operate under complex conditions, often experiencing variable speeds and loads. These forces subject the rotors to high-speed centrifugal forces. These forces can cause deformation in the rotor bars, particularly at the junctions between the end rings and the bars, where stress concentration occurs, posing a risk of fracture and failure. Summary of the Invention

[0003] The main purpose of the present invention is to provide a motor rotor and a motor, aiming to solve the technical problem in the prior art that there is a risk of breakage of the conductive bars of the motor rotor.

[0004] To achieve the above object, the present invention provides a motor rotor, comprising:

[0005] An iron core assembly, wherein two end rings are respectively provided at both ends of the iron core assembly, and the iron core assembly includes a plurality of iron core rings arranged in sequence along its axial direction, the end rings abutting against the iron core rings arranged adjacent thereto, each of the iron core rings having a guide groove, and the plurality of guide grooves of all the iron core rings are sequentially connected to form a channel;

[0006] A guide bar, wherein the guide bar is passed through the channel to penetrate the core assembly, and the two ends of the guide bar are respectively connected to the two end rings, and a boss is formed on the guide bar at a position corresponding to each guide groove; the end ring and the boss arranged near it, and any two adjacent bosses are connected to each other and staggered along the radial and / or circumferential direction of the core assembly to form a step structure, and the step surface of the step structure abuts the end face of the core ring on the same side thereof.

[0007] Preferably, any two adjacent guide grooves partially overlap along the radial and / or circumferential direction of the core assembly, and the boss matches the shape of the corresponding guide groove and is embedded in the corresponding guide groove.

[0008] Preferably, the guide groove is a closed groove and is located close to the outer edge of the core ring.

[0009] Preferably, the length direction of the guide groove is consistent with the radial direction of the core assembly, the width direction of the guide groove is consistent with the circumferential direction of the core assembly, and the width dimension of the guide groove is gradually reduced in the direction close to the inner edge of the core ring.

[0010] Preferably, any two adjacent guide grooves are aligned with one end close to the outer edge of the core ring, and the length of one of the guide grooves is greater than the length of the other guide groove.

[0011] Preferably, two ends of any two adjacent guide slots are aligned, and on the same radial line of the core assembly, the width of one of the guide slots is greater than the width of the other guide slot.

[0012] Preferably, each of the core rings is composed of a plurality of punching sheets stacked in sequence along the axial direction of the core assembly, each of the punching sheets is provided with a punching hole, and the plurality of punching holes of all the punching sheets are connected in sequence to form the guide groove.

[0013] Preferably, in each of the core rings, a plurality of punching holes are arranged opposite to each other to form a straight strip-shaped guide groove consistent with the axial extension direction of the core assembly;

[0014] or,

[0015] In each of the core rings, a plurality of punching holes are staggered and distributed in sequence along the circumference of the core assembly to form the arc-shaped guide groove extending along the circumference of the core assembly.

[0016] Preferably, each core ring is provided with a plurality of guide grooves, which are arranged at intervals along the circumference of the core ring. The number of guide grooves on all core rings is the same and they are connected one-to-one to form a plurality of channels, and each channel is provided with a guide bar.

[0017] The present invention also provides a motor, comprising the motor rotor described above.

[0018] In the technical solution of the present invention, in the motor rotor, bosses are formed at positions corresponding to the guide grooves on the guide bars, and the end rings and the bosses arranged near them, as well as any two adjacent bosses, are connected to each other and staggered along the radial and / or circumferential directions of the core assembly to form a stepped structure. The stepped structure has a stepped surface, and the stepped surface can abut against the end face of the core ring on the same side of the step surface, so that the guide bars and the end rings abut against the end faces of multiple core rings, thereby achieving mutual extrusion and pre-tightening of the guide bars and the end rings with the multiple core rings, and further achieving segmented extrusion and pre-tightening of the guide bars and the end rings with the core assembly. Therefore, when the motor rotor rotates, the abutting surfaces between the core assembly and the guide bars and the end rings will generate friction to offset the centrifugal force. The friction constrains the guide bars and the end rings, thereby overcoming the deformation of the guide bars and the end rings under the action of centrifugal force, reducing the stress at the connection between the guide bars and the end rings, avoiding stress concentration, and further enhancing the mechanical strength of the connection between the guide bars and the end rings, eliminating the risk of guide bar breakage, and enabling the motor rotor to adapt to higher speed conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0020] Figure 1 This is a schematic diagram of the assembly of a motor rotor according to an embodiment of the present invention;

[0021] Figure 2 This is an exploded schematic diagram of a motor rotor according to an embodiment of the present invention;

[0022] Figure 3 for Figure 2 A magnified schematic diagram of area A in the middle;

[0023] Figure 4 Schematic cross-sectional view of a motor rotor according to an embodiment of the present invention;

[0024] Figure 5 Schematic cross-sectional view of an iron core assembly in a motor rotor according to an embodiment of the present invention;

[0025] Figure 6 This is a schematic structural diagram of a first punching sheet in a motor rotor according to an embodiment of the present invention;

[0026] Figure 7 Schematic diagram of the structure of the second punching sheet in the motor rotor according to one embodiment of the present invention.

[0027] Description of Figure Numbers:

[0028] Label name Label name 100 Motor rotor 1121 punching 10 Core assembly 1121a First punching 11 core ring 1122b Second punching 11a First core ring 12 aisle 11b Second core ring 20 End ring 111 guide groove 30 Guide bars 111a First guide groove 31 boss 111b Second guide groove 31a First boss 112 Film processing 31b Second boss 112a First punch 40 Ladder structure 112b Second punch 41 Step surface

[0029] The purpose, features and advantages of the present invention will be further described with reference to the accompanying drawings and in conjunction with the embodiments. DETAILED DESCRIPTION

[0030] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0031] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indications will also change accordingly.

[0032] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features specified as "first" and "second" may explicitly or implicitly include at least one of such features. In addition, the technical solutions between the various embodiments can be combined with each other, but this must be based on the fact that ordinary technicians in this field can implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0033] The present invention provides a motor rotor 100 .

[0034] like Figures 1 to 5As shown, in one embodiment, the motor rotor 100 includes a core assembly 10 and a guide bar 30, wherein two end rings 20 are respectively provided at both ends of the core assembly 10. The core assembly 10 includes a plurality of core rings 11 arranged in sequence along its axial direction. The end rings 20 abut against the core rings 11 arranged adjacent thereto. Each core ring 11 is provided with a guide groove 111. The plurality of guide grooves 111 of all the core rings 11 are sequentially connected to form a channel 12. The guide bar 30 is inserted into the channel 12 to pass through the core assembly 10, and the two ends of the guide bar 30 are respectively connected to the two end rings 20. Bosses 31 are formed on the guide bar 30 at positions corresponding to the guide grooves 111. The end rings 20 and the bosses 31 arranged adjacent thereto, as well as any two adjacent bosses 31, are interconnected and staggered along the radial and / or circumferential directions of the core assembly 10 to form a stepped structure 40. The step surface 41 of the stepped structure 40 abuts against the end surface of the core ring 11 on the same side thereof.

[0035] Specifically, the axial direction of the core assembly 10 is the left-right direction, and the two end rings 20 are respectively provided at the left and right ends of the core assembly 10. The core assembly 10 includes a plurality of core rings 11 arranged in sequence from left to right. The end ring 20 at the left end abuts against the leftmost core ring 11, and the end ring 20 at the right end abuts against the rightmost core ring 11. Each core ring 11 is provided with a guide groove 111, and multiple core rings 11 have multiple guide grooves 111. The multiple guide grooves 111 on all core rings 11 are sequentially connected to form a channel 12. The guide bar 30 is provided in the left-right direction within the channel 12, and the guide bar 30 passes through the core assembly 10. The left and right ends of the guide bar 30 are respectively connected to the two end rings 20, thereby realizing the assembly between the core assembly 10, the guide bar 30, and the end ring 20.

[0036] In this embodiment, bosses 31 are formed on the guide bar 30 at positions corresponding to the guide grooves 111. It is understood that there are multiple guide grooves 111, and the number of bosses 31 is the same as the number of guide grooves 111. The bosses 31 are also multiple, and the multiple bosses 31 are arranged in sequence along the axial direction of the core assembly 10, that is, in the left-right direction. The left end ring 20 and the leftmost boss 31 are connected to each other in a stepped structure 40, the right end ring 20 and the rightmost boss 31 are connected to each other in a stepped structure 40, and any two adjacent bosses 31 are connected to each other in a stepped structure 40. It is understood that the bosses 31 can protrude radially from the guide bar 30 toward the core assembly 10, can protrude circumferentially from the guide bar 30 toward the core assembly 10, or can protrude both radially and circumferentially from the guide bar 30 toward the core assembly 10. If the protruding sizes and / or directions of any two adjacent bosses 31 are inconsistent, a stepped structure 40 distributed in a staggered manner along the radial direction and / or the circumferential direction of the core assembly 10 will be formed.

[0037] It can be understood that the step structure 40 has a step surface 41, and the step surface 41 can abut against the end surface of the core ring 11 on the same side of the step surface 41, so that the guide bar 30 and the end ring 20 abut against the end surfaces of multiple core rings 11, thereby achieving mutual extrusion and pre-tightening of the guide bar 30 and the end ring 20 and the multiple core rings 11, and then achieving segmented extrusion and pre-tightening of the guide bar 30 and the end ring 20 and the core assembly 10. Therefore, when the motor rotor 100 rotates, the abutment surfaces between the core assembly 10 and the guide bar 30 and the end ring 20 will generate friction to offset the centrifugal force, such as Figure 4 As shown by the straight arrow in the middle, the friction force constrains the guide bar 30 and the end ring 20, thereby overcoming the deformation of the guide bar 30 and the end ring 20 under the action of centrifugal force, reducing the stress at the connection between the guide bar 30 and the end ring 20, avoiding stress concentration, and thus strengthening the mechanical strength of the connection between the guide bar 30 and the end ring 20, eliminating the risk of breakage of the guide bar 30, and allowing the motor rotor 100 to adapt to higher speed working conditions.

[0038] In the motor rotor 100 of the present invention, any two adjacent guide slots 111 partially overlap along the radial and / or circumferential direction of the core assembly 10, and the boss 31 matches the shape of the corresponding guide slot 111 and is embedded in the corresponding guide slot 111. In one embodiment, Figures 2 to 5 As shown, any two adjacent guide grooves 111 overlap along the radial part of the core assembly 10. Since the boss 31 matches the shape of the corresponding guide groove 111 and is embedded in the corresponding guide groove 111, any two adjacent bosses 31 overlap along the radial part of the core assembly 10, thereby realizing the staggered distribution of the two bosses 31 to form a stepped surface 41 abutting the end face of each core ring 11. It can be understood that there is also an overlap between the end ring 20 and the boss 31 arranged near it to form a stepped surface 41 abutting the end face of the core ring 11 on the same side, thereby realizing the segmented extrusion pre-tightening of the guide bar 30 and the end ring 20 and the core assembly 10.

[0039] In another embodiment, any two adjacent guide grooves 111 overlap along the circumferential portion of the core assembly 10, so that any two adjacent bosses 31 overlap along the circumferential portion of the core assembly 10, thereby realizing two staggered distributions to form a step surface 41 abutting the end face of each core ring 11, and there is also an overlap between the end ring 20 and the boss 31 arranged near it to form a step surface 41 abutting the end face of the core ring 11 on the same side, thereby realizing the segmented extrusion pre-tightening of the guide bar 30 and the end ring 20 and the core assembly 10.

[0040] In another embodiment, any two adjacent guide grooves 111 partially overlap along the radial and circumferential directions of the core assembly 10, so that any two adjacent bosses 31 partially overlap along the radial and circumferential directions of the core assembly 10, thereby realizing an alternating distribution of the two bosses 31 to form a stepped surface 41 abutting the end face of each core ring 11, and there is also an overlap between the end ring 20 and the boss 31 arranged near it to form a stepped surface 41 abutting the end face of the core ring 11 on the same side, thereby realizing segmented extrusion pre-tightening of the guide bar 30 and the end ring 20 and the core assembly 10.

[0041] In one embodiment, the guide groove 111 is a closed groove and is located near the outer edge of the core ring 11. The closed guide groove 111 provides comprehensive constraints on the outer edge of the guide bar 30, improving the assembly stability of the guide bar 30 and the core assembly 10. Furthermore, the closed guide groove 111 reduces magnetic field harmonics in the motor rotor 100, resulting in better NVH performance and improved motor performance. Furthermore, the position of the guide bar 30 embedded in the guide groove 111 near the outer edge of the core ring 11 increases the linear velocity of the motor rotor 100, enabling high-speed motion of the motor rotor 100.

[0042] Furthermore, the length direction of the guide groove 111 is consistent with the radial direction of the core assembly 10, the width direction of the guide groove 111 is consistent with the circumferential direction of the core assembly 10, and the width dimension of the guide groove 111 is gradually reduced in the direction close to the inner edge of the core ring 11, that is, the width of the guide groove 111 gradually decreases in the direction close to the axis of the core assembly 10, and the cross-sectional shape of the guide bar 30 matches the shape of the guide groove 111, then the cross-sectional width of the guide bar 30 gradually decreases in the direction close to the axis of the core assembly 10, which can ensure sufficient contact between the guide bar 30 and the core ring 11, and the contact reliability and stability are higher, thereby enhancing the connection strength between the guide bar 30 and the core assembly 10. In addition, it can also make the magnetic flux line distribution of the motor rotor 100 smoother, avoiding local magnetic flux saturation.

[0043] like Figure 4 and Figure 5 As shown, in one embodiment, any two adjacent guide slots 111 are aligned at one end near the outer edge of the core ring 11, and the length of one guide slot 111 is greater than the length of the other guide slot 111. This results in the outer edges of the guide bars 30 passing through the multiple guide slots 111 being flush, while the inner edges being uneven, forming multiple stepped structures 40. It will be appreciated that the bosses 31 are formed on the inner edges of the guide bars 30, and the protruding lengths of any two adjacent bosses 31 along the radial direction of the core assembly 10 are inconsistent. Furthermore, the protruding lengths of the two bosses 31 distributed on the left and right sides of any boss 31 can be consistent, thereby forming an alternating concave and convex shape on the inner edges of the guide bars 30 along the axial direction of the core assembly 10.

[0044] In another embodiment, the ends of any two adjacent guide slots 111 are aligned, and on the same radial line of the core assembly 10, the width of one guide slot 111 is greater than the width of the other guide slot 111. This results in the outer and inner edges of the guide bars 30 extending through the multiple guide slots 111 being flush, while the widthwise sides thereof are uneven, forming a plurality of stepped structures 40. It is understood that the bosses 31 are formed on both sides of the width of the guide bar 30, and the widths of any two adjacent bosses 31 are inconsistent. Furthermore, the widths of the two bosses 31 located on the left and right sides of any boss 31 can be consistent, thereby forming an alternating concave and convex shape along the axial direction of the core assembly 10 on both sides of the width of the guide bar 30.

[0045] In another embodiment, the inner and outer edges of the longitudinal direction of the guide bar 30 and both ends of the width direction thereof may form alternating concave and convex shapes. The shape of the guide bar 30 of the present invention can be flexibly set according to actual conditions and is not limited here.

[0046] like Figure 6 and Figure 7 As shown, in one embodiment, each core ring 11 is composed of a plurality of punching sheets 112 stacked in sequence along the axial direction of the core assembly 10. Each punching sheet 112 is provided with a punching hole 1121, and the punching holes 1121 of all punching sheets 112 are sequentially connected to form a guide slot 111. Specifically, the core ring 11 is formed by punching and stacking a plurality of silicon steel sheets to increase the resistance of the core ring 11, reduce eddy currents in the core ring 11, and improve motor efficiency. The plurality of punching sheets 112 have a plurality of punching holes 1121, and the plurality of punching holes 1121 are sequentially connected along the axial direction of the core assembly 10 to form a guide slot 111, facilitating assembly with the guide bar 30.

[0047] In one embodiment, multiple punched holes 1121 are arranged in opposite directions in each core ring 11 to form a straight guide slot 111 that extends in the axial direction of the core assembly 10. It is understood that the rounded angles of the multiple punched holes 1121 are the same to form straight bosses 31. The multiple bosses 31 are sequentially connected to form straight guide bars 30, facilitating the fabrication of the guide bars 30.

[0048] In another embodiment, in each core ring 11, a plurality of punching holes 1121 are sequentially staggered along the circumference of the core assembly 10 to form an arcuate guide groove 111 extending along the circumference of the core assembly 10. It is understandable that the central angles of the plurality of punching holes 1121 can be arranged in a gradual manner, so that the plurality of punching holes 1121 are sequentially staggered along the circumference of the core assembly 10 to form an arcuate guide groove 111 extending along the circumference of the core assembly 10, thereby forming an arcuate boss 31 extending along the circumference of the core assembly 10. The plurality of bosses 31 are sequentially connected to form a guide bar 30 spirally wound around the core assembly 10, which helps to improve the starting torque and smoothness of the motor.

[0049] In one embodiment, each core ring 11 defines a plurality of guide slots 111, which are spaced apart along the circumference of the core ring 11. The number of guide slots 111 on all core rings 11 is identical, and the guide slots 111 are interconnected to form a plurality of channels 12, each of which is provided with a conductive bar 30. It is understood that there are a plurality of conductive bars 30, which are spaced apart along the circumference of the core assembly 10 to form a high-speed asynchronous squirrel-cage motor rotor 100.

[0050] like Figures 1 to 7 As shown, among the multiple core rings 11, several of the core rings 11 are first core rings 11a, and the remaining core rings are second core rings 11b. Several first core rings 11a are spaced apart along the axial direction of the core assembly 10, and a second core ring 11b is arranged between any two adjacent first core rings 11a. The guide groove 111 of the first core ring 11a is the first guide groove 111a, and the guide groove 111 of the second core ring 11b is the second guide groove 111b. The number, distribution method and shape of the first guide groove 111a of the first core ring 11a and the second guide groove 111b of the second core ring 11b are consistent, and only the length is inconsistent. Specifically, the first guide groove 111a and the second guide groove 111b are aligned at one end near the outer edge of the core ring 11, and the length of the second guide groove 111b is greater than that of the first guide groove 111a. The boss 31 corresponding to the first guide groove 111a is the first boss 31a, and the boss 31 corresponding to the second guide groove 111b is the second boss 31b. The protruding length of the second boss 31b is greater than that of the first boss 31a, so that multiple stepped structures 40 are formed on the inner edge of the guide bar 30. The punching piece of the first core ring 11a is the first punching piece 112a, and the punching hole opened in the first punching piece 112a is the first punching hole 1121a. The punching piece of the second core ring 11b is the second punching piece 112b, and the punching hole opened in the second punching piece 112b is the second punching hole 1122b.

[0051] In the motor rotor 100 of the present invention, the guide bars 30 can be secured to the end rings 20 by welding or integral casting. The guide bars 30 and end rings 20 can be made of copper or aluminum, forming a copper motor rotor 100 or an aluminum motor rotor 100. The copper motor rotor 100 has high electrical conductivity and excellent electromagnetic properties, while the aluminum motor rotor 100 offers advantages such as a simplified casting process and lower costs. Furthermore, the aluminum motor rotor 100 has a lower porosity, better dynamic balancing, and a higher manufacturing yield.

[0052] The present invention further provides a motor comprising the motor rotor 100 described above. The specific structure of the motor rotor 100 in the motor is similar to that of the above embodiments. Since the present motor utilizes all the technical solutions of all the above embodiments, it at least has all the beneficial effects brought about by the technical solutions of the above embodiments, and therefore will not be described in detail here.

[0053] The above are only preferred embodiments of the present invention and are not intended to limit the patent scope of the present invention. All equivalent structural transformations made using the contents of the present invention's description and drawings, or direct / indirect applications in other related technical fields, within the scope of the present invention are included in the patent protection scope of the present invention.

Claims

1. A motor rotor, characterized in that: The motor rotor comprises: An iron core assembly, wherein two end rings are respectively provided at both ends of the iron core assembly, and the iron core assembly includes a plurality of iron core rings arranged in sequence along its axial direction, the end rings abutting against the iron core rings arranged adjacent thereto, each of the iron core rings having a guide groove, and the plurality of guide grooves of all the iron core rings are sequentially connected to form a channel; A guide bar, wherein the guide bar is passed through the channel to penetrate the core assembly, and the two ends of the guide bar are respectively connected to the two end rings, and a boss is formed on the guide bar at a position corresponding to each guide groove; the end ring and the boss arranged near it, and any two adjacent bosses are connected to each other and staggered along the radial and / or circumferential direction of the core assembly to form a step structure, and the step surface of the step structure abuts the end face of the core ring on the same side thereof.

2. The motor rotor according to claim 1, characterized in that: Any two adjacent guide slots partially overlap along the radial direction and / or circumferential direction of the core assembly, and the bosses match the shapes of the corresponding guide slots and are embedded in the corresponding guide slots.

3. The motor rotor according to claim 2, characterized in that: The guide groove is a closed groove and is located close to the outer edge of the core ring.

4. The motor rotor according to claim 3, characterized in that: The length direction of the guide groove is consistent with the radial direction of the core assembly, the width direction of the guide groove is consistent with the circumferential direction of the core assembly, and the width dimension of the guide groove is gradually reduced in the direction close to the inner edge of the core ring.

5. The motor rotor according to claim 4, characterized in that: Any two adjacent guide grooves are aligned with one end close to the outer edge of the core ring, and the length of one of the guide grooves is greater than the length of the other guide groove.

6. The motor rotor according to claim 4, characterized in that: The two ends of any two adjacent guide slots are aligned respectively, and on the same radial line of the core assembly, the width of one of the guide slots is greater than the width of the other guide slot.

7. The motor rotor according to any one of claims 1 to 6, characterized in that: Each of the core rings is composed of a plurality of punching sheets stacked in sequence along the axial direction of the core assembly. Each of the punching sheets is provided with a punching hole, and the plurality of punching holes of all the punching sheets are connected in sequence to form the guide groove.

8. The motor rotor according to claim 7, characterized in that: In each of the core rings, a plurality of punching holes are arranged opposite to each other to form a straight strip-shaped guide groove that is consistent with the axial extension direction of the core assembly; or, In each of the core rings, a plurality of punching holes are staggered and distributed in sequence along the circumference of the core assembly to form the arc-shaped guide groove extending along the circumference of the core assembly.

9. The motor rotor according to any one of claims 1 to 6, characterized in that: Each core ring is provided with a plurality of guide grooves, which are arranged at intervals along the circumference of the core ring. The number of guide grooves on all core rings is the same and they are connected one-to-one to form a plurality of channels, and each channel is provided with a guide bar.

10. A motor, characterized in that: The electric motor comprises the electric motor rotor according to any one of claims 1 to 9.

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