Motor rotor and motor having the same

Abstract

The present invention provides a motor rotor and a motor having the same. The motor rotor includes: a rotor core, the outer surface of the rotor core has a plurality of first limiting structures; a plurality of second limiting structures, which can be selectively connected to the plurality of first limiting structures, and the second limiting structures after connection have limiting parts protruding from the outer surface of the rotor core, and an accommodation space is formed between two adjacent limiting parts in the circumferential direction of the rotor core; at least one permanent magnet is arranged in the accommodation space to realize the connection between the permanent magnet and the rotor core. The present invention effectively solves the problem in the prior art that the rotor core needs to be repeatedly molded for motor rotors with different pole numbers.

Description

Technical Field

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

[0002] In a permanent magnet brushless DC motor, the motor rotor uses a permanent magnet rotor. The shape and installation method of the permanent magnet have a great influence on the performance of the motor. Generally, the commonly used permanent magnet installation methods include surface mounting, injection molding, and embedded.

[0003] However, no matter which of the above installation methods is adopted, the traditional permanent magnet rotor is a rotor with one rotor core corresponding to one pole number. Rotors with different pole numbers need to repeatedly open the rotor core, and the universal design of the rotor core cannot be achieved, resulting in material waste of the rotor core, increasing the manufacturing cost of the motor rotor, and increasing the labor intensity of the staff. Summary of the invention

[0004] The main purpose of the present invention is to provide a motor rotor and a motor having the same, so as to solve the problem in the prior art that motor rotors with different pole numbers need to repeatedly open the mold of the rotor core.

[0005] In order to achieve the above-mentioned purpose, according to one aspect of the present invention, a motor rotor is provided, comprising: a rotor core, the outer surface of which has a plurality of first limiting structures; a plurality of second limiting structures, which can be selectively connected to the plurality of first limiting structures, and the second limiting structures after connection have limiting portions protruding from the outer surface of the rotor core, and an accommodation space is formed between two adjacent limiting portions in the circumferential direction of the rotor core; and at least one permanent magnet is arranged in the accommodation space to realize the connection between the permanent magnet and the rotor core.

[0006] Furthermore, the first limiting structure is a limiting groove, the second limiting structure is a limiting block, and the limiting groove and the limiting block are interference fit or fastened together.

[0007] Furthermore, all the limiting grooves are divided into a plurality of slot groups, and the slot groups extend along the axial direction and / or circumferential direction of the rotor core.

[0008] Furthermore, at least two groups of slot groups are spaced apart along the axial direction of the rotor core, and at least two groups of slot groups are symmetrically arranged along the axial direction of the rotor core.

[0009] Furthermore, each slot group includes: a plurality of axial connecting grooves, each axial connecting groove extends along the axial direction of the rotor core, and two adjacent axial connecting grooves are spaced apart along the circumferential direction of the rotor core, and at least one axial connecting groove is connected to the end surface of the rotor core; a plurality of circumferential connecting grooves, two adjacent axial connecting grooves are connected through the circumferential connecting groove, and the limit block can slide in the axial connecting groove and the circumferential connecting groove.

[0010] Furthermore, a connecting line between the axial connecting grooves in at least one slot group and the axial connecting grooves in another slot group is parallel to the central axis of the rotor core.

[0011] Furthermore, the limit block includes a connecting portion and a limit portion connected in sequence, the connecting portion is adapted to the shape of the axial connecting groove, and the limit portion gradually increases in width in the direction away from the connecting portion, so as to form an accommodating space between two adjacent limit portions in the circumferential direction of the rotor core.

[0012] Furthermore, the axial connecting groove is a T-shaped groove or a dovetail groove, and the limiting block is in an I-shape.

[0013] Furthermore, in the same slot group, the lengths of all circumferential connecting slots are equal.

[0014] Furthermore, the thickness of the limiting block is less than or equal to the width of the circumferential connecting groove.

[0015] Further, along the extending direction of the axial connecting groove, one end of the circumferential connecting groove is connected with the middle part of the axial connecting groove.

[0016] Furthermore, a plurality of limit blocks are symmetrically arranged along the central axis of the rotor core.

[0017] According to another aspect of the present invention, a motor is provided, comprising the motor rotor described above.

[0018] According to the technical solution of the present invention, the motor rotor includes a rotor core, a second limiting structure and a permanent magnet. The outer surface of the rotor core has a plurality of first limiting structures. There are a plurality of second limiting structures, which can be selectively connected to the plurality of first limiting structures, and the second limiting structures after connection have a limiting portion protruding from the outer surface of the rotor core, and a receiving space is formed between two adjacent limiting portions in the circumferential direction of the rotor core. There is at least one permanent magnet, which is arranged in the receiving space to realize the connection between the permanent magnet and the rotor core. In this way, the rotor core is connected to the permanent magnet through the second limiting structure, and the second limiting structure can be selectively connected to the first limiting structure on the outer surface of the rotor core, so that the number and position of the second limiting structures connected to the rotor core can be adjusted, and thus the number of permanent magnets assembled with the limiting portion of the second limiting structure can be adjusted.

[0019] Compared with the prior art that requires re-molding for motor rotors with different numbers of poles, the motor rotor in the present application does not need to be re-molded. It only requires adjusting the number and position of the second limiting structures to achieve motor rotors with multiple pole numbers corresponding to the same rotor core, thereby making the number of poles of the motor rotor variable, simplifying the operation, and reducing the processing cost of the motor rotor. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The drawings constituting a part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0021] Figure 1 A schematic diagram of a three-dimensional structure of a motor rotor according to an embodiment of the present invention having four poles is shown;

[0022] Figure 2 Shows Figure 1 Schematic diagram of the exploded structure of the motor rotor in FIG.

[0023] Figure 3 Shows Figure 1 A schematic diagram of the three-dimensional structure of the rotor core of the motor rotor;

[0024] Figure 4 Shows Figure 1 A schematic diagram of the three-dimensional structure of the second limiting structure of the motor rotor;

[0025] Figure 5 Shows Figure 1 A schematic diagram of a three-dimensional structure in which the number of poles of the motor rotor is 6; and

[0026] Figure 6 Shows Figure 5 Schematic diagram of the exploded structure of the motor rotor.

[0027] The above drawings include the following reference numerals:

[0028] 10. Rotor core; 20. Second limiting structure; 21. Limiting portion; 22. Connecting portion; 30. Permanent magnet; 40. Slot group; 41. Axial connecting slot; 42. Circumferential connecting slot. DETAILED DESCRIPTION

[0029] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0030] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meanings as commonly understood by ordinary technicians in the technical field to which this application belongs.

[0031] In the present invention, unless otherwise specified, the directional words used, such as "up" and "down", usually refer to the directions shown in the drawings, or to the vertical, perpendicular or gravity directions; similarly, for ease of understanding and description, "left" and "right" usually refer to the left and right shown in the drawings; "inside" and "outside" refer to the inside and outside relative to the outline of each component itself, but the above directional words are not used to limit the present invention.

[0032] In order to solve the problem in the prior art that motor rotors with different pole numbers require repeated mold opening and processing of rotor cores, the present application provides a motor rotor and a motor having the same.

[0033] like Figures 1 to 6 As shown, the motor rotor includes a rotor core 10, a plurality of second limiting structures 20 and at least one permanent magnet 30. The outer surface of the rotor core 10 has a plurality of first limiting structures. The plurality of second limiting structures 20 can be selectively connected to the plurality of first limiting structures, and the connected second limiting structures 20 have limiting portions 21 protruding from the outer surface of the rotor core 10, and an accommodation space is formed between two adjacent limiting portions 21 in the circumferential direction of the rotor core 10. At least one permanent magnet 30 is arranged in the accommodation space to achieve the connection between the permanent magnet 30 and the rotor core 10.

[0034] By applying the technical solution of this embodiment, the rotor core 10 is connected to the permanent magnet 30 through the second limiting structure 20, and the second limiting structure 20 can be selectively connected to the first limiting structure on the outer surface of the rotor core 10, so that the number and position of the second limiting structures 20 connected to the rotor core 10 can be adjusted, and thus the number of permanent magnets 30 assembled with the limiting part 21 of the second limiting structure 20 can be adjusted.

[0035] Compared with the prior art that requires re-molding for motor rotors with different numbers of poles, the motor rotor in this embodiment does not need to be re-molded. Only the number and position of the second limiting structures 20 need to be adjusted to achieve motor rotors with multiple numbers of poles corresponding to the same rotor core 10, so that the number of poles of the motor rotor can be changed, the operation is simple, and the processing cost of the motor rotor is reduced.

[0036] In this embodiment, the outer surface of the rotor core 10 is improved, and the permanent magnet 30 is limited by cooperating with the first limiting structure of the rotor core 10 and the second limiting structure 20 to ensure that the permanent magnet 30 is in contact with the outer surface of the rotor core 10. By cooperating with the permanent magnet 30 and different numbers of second limiting structures 20, the same rotor core 10 of the motor rotor can correspond to a variety of pole numbers, thereby avoiding repeated molding of the rotor core 10, saving costs, and having high versatility.

[0037] like Figure 3 and Figure 4As shown, the first limiting structure is a limiting groove, the second limiting structure 20 is a limiting block, and the limiting groove and the limiting block are interference fit. In this way, the limiting block and the limiting groove are interference fit, thereby making the assembly of the second limiting structure 20 and the rotor core 10 more stable, and preventing the limiting block from escaping from the rotor core 10. Afterwards, the permanent magnet 30 is arranged between the limiting portions 21 of two adjacent limiting blocks, and then the permanent magnet 30 is assembled on the rotor core 10 to form a motor rotor. The above connection method makes the connection between the limiting block and the permanent magnet 30 and the rotor core 10 more stable, thereby improving the structural stability of the motor rotor.

[0038] In other embodiments not shown in the accompanying drawings, the limit groove is fastened to the limit block. Specifically, the fastener passes through the limit block and is fixed in the limit groove of the rotor core. Afterwards, the permanent magnet is arranged between the limit portions of two adjacent limit blocks, and then the permanent magnet is assembled on the rotor core to form the motor rotor. The above connection method makes it easier to assemble or disassemble the limit block and the rotor core, and facilitates the replacement of the limit block.

[0039] It should be noted that the structure of the second limiting structure 20 is not limited to this. Optionally, the second limiting structure 20 is a limiting plate, and the axial position of the permanent magnet 30 and the rotor core 10 is fixed by adding limiting plates on both sides of the permanent magnet 30. In this way, the plate-like structure is lighter in weight, which can reduce the overall weight of the motor rotor and achieve a lightweight design. Specifically, the limiting plate is inserted into the limiting groove along the axial direction of the rotor core 10, and the position of the limiting plate relative to the limiting groove is fixed, and then the permanent magnet 30 is arranged between the limiting portions of two adjacent limiting plates, and then the permanent magnet 30 is assembled on the rotor core 10 to form a motor rotor.

[0040] like Figure 3 As shown, all the limit grooves are divided into a plurality of slot groups 40, and the slot groups 40 extend along the axial direction and the circumferential direction of the rotor core 10. On the one hand, the above arrangement enables the limit grooves to be distributed at different positions on the outer surface of the rotor core 10, so that the limit blocks connected to the limit grooves are distributed at different positions of the rotor core 10, thereby preventing the outer surface of the rotor core 10 from being subjected to concentrated force, thereby improving the structural strength of the rotor core 10; on the other hand, the above arrangement enables the limit grooves to be distributed on the surface of the rotor core 10 as much as possible, thereby increasing the range of the number of poles of the motor rotor, such as 4 poles, 6 poles, 8 poles, etc. The above structure is simple in structure, easy to process, and reduces the labor intensity of the staff.

[0041] In other embodiments not shown in the accompanying drawings, all the limit slots are divided into a plurality of slot groups, and the slot groups extend along the axial direction of the rotor core. In this way, the plurality of slot groups are arranged parallel to the axial direction of the rotor core, so that the limit blocks connected to the limit slots are evenly distributed on the outer surface of the rotor core, thereby making the rotor core evenly stressed and improving the structural strength of the rotor core. The above arrangement allows as many limit slots as possible to be distributed on the surface of the rotor core, thereby increasing the range of the number of poles of the motor rotor, such as 4 poles, 6 poles, 8 poles, etc. The above structure is simple in structure, easy to process, and reduces the labor intensity of the staff.

[0042] In other embodiments not shown in the accompanying drawings, all the limit slots are divided into a plurality of slot groups, and the slot groups extend along the circumferential direction of the rotor core. In this way, the plurality of slot groups are arranged in parallel, so that the limit blocks connected to the limit slots are evenly distributed on the outer surface of the rotor core, thereby making the rotor core evenly stressed and improving the structural strength of the rotor core. The above arrangement allows as many limit slots as possible to be distributed on the surface of the rotor core, thereby increasing the range of the number of poles of the motor rotor, such as 4 poles, 6 poles, 8 poles, etc. The above structure is simple in structure, easy to process, and reduces the labor intensity of the staff.

[0043] Optionally, at least two groups of slot groups 40 are arranged at intervals along the axis direction of the rotor core 10, and at least two groups of slot groups 40 are arranged symmetrically along the axis direction of the rotor core 10. In this way, the above arrangement can ensure that there are at least two limit blocks on both sides of each permanent magnet 30 for limit stopping, thereby improving the assembly stability of the permanent magnet 30 and the rotor core 10. Figure 3 As shown, in this embodiment, two groups of slot groups 40 are arranged at intervals along the axis direction of the rotor core 10, and the two groups of slot groups 40 are symmetrically arranged along the axis direction of the rotor core 10. In this way, the above arrangement can ensure that there are two limit blocks on both sides of each permanent magnet 30 for limiting and fixing, thereby preventing the permanent magnet 30 from shifting and ensuring the normal operation of the motor rotor.

[0044] Specifically, the number of limit blocks along the axial direction of the rotor core 10 is an even number, and they are arranged symmetrically along the center plane, thereby ensuring that the limit blocks are in multi-point contact with the permanent magnet 30, increasing the contact area between the two, preventing the permanent magnet 30 from axial movement, and improving the fitting strength, force balance and structural reliability.

[0045] Optionally, each slot group 40 includes a plurality of axial connecting slots 41 and a plurality of circumferential connecting slots 42. Each axial connecting slot 41 extends along the axial direction of the rotor core 10, and two adjacent axial connecting slots 41 are spaced apart along the circumferential direction of the rotor core 10, and at least one axial connecting slot 41 is connected to the end surface of the rotor core 10. Two adjacent axial connecting slots 41 are connected through the circumferential connecting slot 42, and the limit block can slide in the axial connecting slot 41 and the circumferential connecting slot 42. Figure 3 As shown, each slot group 40 includes four axial connecting slots 41 and three circumferential connecting slots 42. Among them, one axial connecting slot 41 is connected to the end surface of the rotor core 10. The above structure is simple and easy to process, and makes it easier to move the limit block in the slot group 40, thereby making it easier to adjust the number of poles of the motor rotor.

[0046] Specifically, the rotor core 10 is made of laminated sheets, and a slot group 40 is provided on the outer surface of the rotor core 10. The limit block slides into the slot group 40 through an axial connecting slot 41 connected to the end surface of the rotor core 10. Different numbers of limit blocks are set according to different pole numbers of the motor rotor. Figure 1 and Figure 2 As shown, when the number of poles of the motor rotor is 4, only one axial connecting groove 41 in each slot group 40 is required to be connected to the stop block, and the stop block is inserted into the axial connecting groove 41 connected to the end surface of the rotor core 10 and the stop block is stopped by the groove, and two stop blocks are arranged at intervals along the axial direction of the rotor core 10. Along the circumferential direction of the rotor core 10, a permanent magnet 30 is accommodated between the stop portions 21 of each two adjacent stop blocks.

[0047] like Figure 5 and Figure 6 As shown, when the number of poles of the motor rotor is required to be 6, each group of slot groups 40 needs to have two axial connecting grooves 41 connected to two limit blocks, the permanent magnet 30 is removed, and the limit block previously set in the axial connecting groove 41 connected to the end face of the rotor core 10 is slid into another axial connecting groove 41 through the circumferential connecting groove 42, and the axial connecting groove 41 and the axial connecting groove 41 connected to the end face of the rotor core 10 are separated by an axial connecting groove 41, and two limit blocks are spaced apart along the axial direction of the rotor core 10, and the two limit blocks are symmetrically arranged along the axial direction of the rotor core 10. Along the circumference of the rotor core 10, a permanent magnet 30 is accommodated between the limit portions 21 of each two adjacent limit blocks, so that the number of poles of the motor rotor can be adjusted to 6.

[0048] like Figure 3As shown, the connecting line of the axial connecting slot 41 in at least one slot group 40 and the axial connecting slot 41 in another slot group 40 is parallel to the central axis of the rotor core 10. In this way, the above arrangement makes it easier for the limit block to move in the axial connecting slot 41 and the moving direction is more consistent; on the other hand, it can ensure that the extending directions of the axial connecting slots 41 are consistent, thereby ensuring that the stopping directions of the limit blocks arranged in the axial connecting slots 41 are consistent, making it easier to install the permanent magnet 30.

[0049] Specifically, at the end where each slot group 40 is connected, the line connecting the last axial connecting slot 41 of the previous slot group 40 and the first axial connecting slot 41 of the next slot group 40 is parallel to the central axis of the rotor core 10. Figure 3 As shown, in this embodiment, there are four groups of axial connecting grooves 41 symmetrically arranged on the outer surface of the rotor core 10 , and the connecting line is parallel to the central axis of the rotor core 10 .

[0050] like Figure 4 As shown, the limit block includes a connecting portion 22 and a limit portion 21 connected in sequence, the connecting portion 22 is adapted to the shape of the axial connecting groove 41, and the width of the limit portion 21 gradually increases in the direction away from the connecting portion 22, so as to form an accommodation space between two adjacent limit portions 21 in the circumferential direction of the rotor core 10. Specifically, the connecting portion 22 is adapted to the shape of the axial connecting groove 41 and can slide in the circumferential connecting groove 42. In the direction away from the connecting portion 22, the accommodation space formed between two adjacent limit portions 21 gradually decreases, thereby preventing the permanent magnet 30 accommodated in the accommodation space from escaping from the accommodation space, thereby improving the structural stability of the motor rotor. The above structure is simple in structure and easy to process, thereby reducing the processing cost of the motor rotor.

[0051] Optionally, the axial connecting groove 41 is a T-shaped groove or a dovetail groove, and the stopper is in an I-shaped shape. The above structure is simple, easy to process and realize, and makes the cooperation between the stopper and the axial connecting groove 41 more secure.

[0052] It should be noted that the structure of the axial connecting groove 41 is not limited thereto, and may also be other types of groove structures, such as an I-shaped groove.

[0053] It should be noted that the structure of the limit block is not limited thereto, and may also be a structure of other shapes, as long as the end of the limit block connected to the axial connecting groove 41 is adapted to the shape of the axial connecting groove 41 .

[0054] like Figure 3 As shown, in the same slot group 40, the lengths of all circumferential connecting slots 42 are equal. Thus, the above arrangement makes the distances between the axial connecting slots 41 equal, so as to realize the switching and adjustment of different pole numbers of the motor rotor.

[0055] In this embodiment, the thickness of the limit block is less than or equal to the width of the circumferential connecting groove 42. In this way, the above arrangement can ensure that the limit block slides smoothly in the circumferential connecting groove 42, thereby realizing the switching of the number of poles of the motor rotor.

[0056] In this embodiment, along the extension direction of the axial connecting groove 41, one end of the circumferential connecting groove 42 is connected to the middle of the axial connecting groove 41. In this way, the above arrangement ensures that there is a margin at the bottom of the axial connecting groove 41 for installing the limit block.

[0057] like Figure 2 and Figure 6 As shown, a plurality of stoppers are symmetrically arranged along the central axis of the rotor core 10. Specifically, according to the maximum pole number requirement of the motor rotor, the axial connecting grooves 41 are evenly distributed at equal angles along the circumference of the rotor core 10 and are linearly distributed along the axial direction of the rotor core 10, so that the axial connecting grooves 41 are symmetrically arranged along the central axis of the rotor core 10, ensuring that the stoppers matched with the axial connecting grooves 41 are symmetrically arranged along the central axis of the rotor core 10 to meet the requirements of different pole numbers.

[0058] The present application also provides a motor (not shown) comprising the motor rotor described above.

[0059] From the above description, it can be seen that the above embodiments of the present invention achieve the following technical effects:

[0060] The rotor core is connected to the permanent magnet through a second limiting structure, and the second limiting structure can be selectively connected to the first limiting structure on the outer surface of the rotor core, so that the number and position of the second limiting structures connected to the rotor core can be adjusted, and the number of permanent magnets assembled with the limiting part of the second limiting structure can be adjusted.

[0061] Compared with the prior art that requires re-molding for motor rotors with different numbers of poles, the motor rotor in the present application does not need to be re-molded. It only requires adjusting the number and position of the second limiting structures to achieve motor rotors with multiple pole numbers corresponding to the same rotor core, thereby making the number of poles of the motor rotor variable, simplifying the operation, and reducing the processing cost of the motor rotor.

[0062] Obviously, the above-described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0063] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0064] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein.

[0065] The above description is only a preferred embodiment of the present invention and is 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 motor rotor, characterized in that: include: A rotor core (10), wherein the outer surface of the rotor core (10) has a plurality of first limiting structures; a plurality of second limiting structures (20) which can be selectively connected to the plurality of first limiting structures, and the connected second limiting structures (20) have limiting portions (21) protruding from the outer surface of the rotor core (10), and a receiving space is formed between two adjacent limiting portions (21) in the circumferential direction of the rotor core (10); at least one permanent magnet (30) disposed in the accommodation space to achieve connection between the permanent magnet (30) and the rotor core (10); The first limiting structure is a limiting groove, the second limiting structure (20) is a limiting block, the limiting groove is fastened to the limiting block; all the limiting grooves are divided into a plurality of slot groups (40), each of the slot groups (40) comprising: a plurality of axial connecting grooves (41), each of the axial connecting grooves (41) extending along the axial direction of the rotor core (10), and two adjacent axial connecting grooves (41) being arranged at intervals along the circumferential direction of the rotor core (10), and at least one of the axial connecting grooves (41) being connected to an end surface of the rotor core (10); A plurality of circumferential connecting grooves (42), two adjacent axial connecting grooves (41) are connected via the circumferential connecting groove (42), and the limit block can slide in the axial connecting groove (41) and the circumferential connecting groove (42).

2. The motor rotor according to claim 1, characterized in that: The slot group (40) extends along the axial direction and / or the circumferential direction of the rotor core (10).

3. The motor rotor according to claim 2, characterized in that: At least two groups of the slot groups (40) are arranged at intervals along the axial direction of the rotor core (10), and at least two groups of the slot groups (40) are arranged symmetrically along the axial direction of the rotor core (10).

4. The motor rotor according to claim 1, characterized in that: A connecting line between the axial connecting groove (41) in at least one of the slot groups (40) and the axial connecting groove (41) in another of the slot groups (40) is parallel to the central axis of the rotor core (10).

5. The motor rotor according to claim 1, characterized in that: The limit block comprises a connecting portion (22) and a limit portion (21) connected in sequence, the connecting portion (22) being adapted to the shape of the axial connecting groove (41), and the limit portion (21) gradually increasing in width in a direction away from the connecting portion (22), so as to form the accommodation space between two adjacent limit portions (21) in the circumferential direction of the rotor core (10).

6. The motor rotor according to claim 1, characterized in that: The axial connecting groove (41) is a T-shaped groove or a dovetail groove, and the limiting block is in an I-shaped shape.

7. The motor rotor according to claim 1, characterized in that: In the same slot group (40), all the circumferential connecting slots (42) are of equal length.

8. The motor rotor according to claim 1, characterized in that: The thickness of the limit block is less than or equal to the width of the circumferential connecting groove (42).

9. The motor rotor according to claim 1, characterized in that: Along the extension direction of the axial connecting groove (41), one end of the circumferential connecting groove (42) is connected to the middle part of the axial connecting groove (41).

10. The motor rotor according to any one of claims 1 to 9, characterized in that: The plurality of limit blocks are symmetrically arranged along the central axis of the rotor core (10).

11. The motor rotor according to claim 1, characterized in that: The fastened connection is replaced by an interference fit.

12. A motor, characterized in that: The invention comprises the motor rotor according to any one of claims 1 to 11.

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