Magnetic steel limiting device, rotor assembly and motor

Abstract

The application provides a magnetic steel limiting device, a rotor assembly and a motor. The magnetic steel limiting device comprises a support body, a first limiting part and a second limiting part. The first limiting part is connected to the support body and extends in a first direction. The second limiting part is connected to the support body and extends in a second direction. The support body, the first limiting part and the second limiting part can form a space for accommodating at least part of the structure of the magnetic steel. The magnetic steel can be assembled into the magnetic steel slot of the rotor iron core after being assembled with the support body, the first limiting part and the second limiting part as a whole. When disassembly is needed, the magnetic steel can be integrally disassembled from the magnetic steel slot together with the support body, the first limiting part and the second limiting part. According to the application, the efficiency of assembling and disassembling the magnetic steel is improved. The problem that the magnetic steel is difficult to disassemble after being installed in the motor rotor in the prior art is effectively solved.

Description

Technical Field

[0001] This invention relates to the field of motor technology, specifically to a magnet limiting device, a rotor assembly, and a motor. Background Technology

[0002] Magnets are a crucial component of the rotor of a permanent magnet synchronous motor, and their assembly is a core step in rotor assembly. Correct and efficient magnet installation is key to improving motor prototyping efficiency. Current motors typically involve applying epoxy resin potting compound to the magnet surface before inserting it into the magnet slots in the iron core, bonding the magnet to the yoke of the iron core, and then finishing it. After finishing, rotor baffles are assembled onto the shaft using an interference fit, fixing them to both sides of the rotor core to restrict axial movement between the rotor core and the magnets. However, the solidified potting compound degrades the cleanliness of the iron core surface, and the potting compound is expensive. This method is wasteful of adhesive and involves cumbersome subsequent processing, so it is rarely used in mass production.

[0003] Another method is rotor potting, where potting compound is poured into the gap between the rotor and the magnets to firmly bond the magnets to the magnet slots of the rotor. Then the rotor baffle is installed, and the fixation of the rotor core and magnets is ensured after the potting compound solidifies. However, in this method, the magnets may be ejected from the rotor core due to the repulsion between like poles during potting, resulting in failure of the rotor potting and scrapping the entire rotor, thus reducing the yield rate.

[0004] In both of these assembly methods, if the magnets are installed backwards, it requires a very complicated process to remove the incorrect magnets, and because the magnets are brittle, they may break during removal. If the rotor baffle has already been assembled, the magnets cannot be removed, rendering the entire rotor unusable.

[0005] Because existing motor rotors suffer from technical problems such as difficulty in disassembling the magnets after installation, this invention researches and designs a magnet limiting device, a rotor assembly, and a motor. Summary of the Invention

[0006] Therefore, the technical problem to be solved by the present invention is to overcome the defect of the motor rotor in the prior art that it is difficult to disassemble after the magnet is installed, thereby providing a magnet limiting device, rotor assembly and motor.

[0007] To address the above problems, the present invention provides a magnetic steel limiting device, comprising: The bracket includes a main body, a first limiting part, and a second limiting part. The first limiting part is connected to the main body and extends in a first direction, while the second limiting part is connected to the main body and extends in a second direction. This allows the main body, the first limiting part, and the second limiting part to form a space that can accommodate at least a portion of the structure of a magnet. The magnet can be assembled with the main body, the first limiting part, and the second limiting part as a whole before being assembled into the magnet slot of the rotor core. When disassembly is required, the magnet, the main body, the first limiting part, and the second limiting part can be detached from the magnet slot as a whole.

[0008] In some implementations... The first limiting part includes a first plate, which is able to face one axial end face of the magnet and limit one axial end face of the magnet. The second limiting part includes a second plate, which is able to face the other axial end face of the magnet and limit the other axial end face of the magnet.

[0009] In some implementations... The first limiting part is connected to one end of the bracket body, and the second limiting part is connected to the other end of the bracket body; The first direction and the second direction are the same direction, and the first limiting part and the second limiting part are opposite to each other along the axial direction of the rotor core; and the plate surface of the first plate opposite to the magnet and the plate surface of the second plate opposite to the magnet are parallel.

[0010] In some implementations... It also includes a third limiting part, which is connected to the main body of the bracket and extends in a third direction, which is opposite to the first direction. After the magnet limiting device and the magnet are integrally assembled onto the rotor core, the third limiting part can engage with one axial end face of the rotor core.

[0011] In some implementations... The third limiting part is an elastic structure. When the magnet needs to be assembled with the rotor core, the third limiting part can move from the magnet slot to one axial end face of the rotor core and be locked onto the axial end face of the rotor core through its elasticity. When the magnet needs to be removed from the rotor core, the third limiting part can be driven to elastically lock into the magnet slot, which is used to remove the magnet limiting device and the magnet from the magnet slot.

[0012] In some implementations... The third limiting part is a rigid structure that is bent to generate elastic force. One end of the third limiting part is connected to the main body of the bracket, and the other end of the third limiting part is formed as a snap-fit ​​limiting surface parallel to one end face of the rotor core.

[0013] In some implementations... The third limiting part and the second limiting part are located on opposite sides of the support body, that is, the second limiting part is located on one side of the support body in the first direction, and the third limiting part is located on one side of the support body in the third direction, and the position of the third limiting part is opposite to the position of the second limiting part.

[0014] In some implementations... The first limiting part also has a limiting structure extending toward the third direction at the position where it is connected to the main body of the bracket. The limiting structure can be engaged with the other end face of the rotor core along the axial direction or abut against the inner wall surface of the magnet slot.

[0015] The present invention also provides a rotor assembly, which includes the aforementioned magnet limiting device, and further includes a magnet and a rotor core. The rotor core is provided with a magnet slot. The magnet and the magnet limiting device are assembled as a whole and then assembled into the magnet slot. When disassembly is required, the magnet and the magnet limiting device can be disassembled from the magnet slot as a whole.

[0016] In some implementations... It also includes a rotor baffle, which is disposed on one end face of the rotor core along the axial direction. The rotor baffle is provided with a disassembly hole, which is opposite to the magnet slot. When the magnet limiting device also includes a third limiting part, the disassembly hole is also opposite to the third limiting part.

[0017] In some implementations... After the magnet and the magnet limiting device are integrally assembled into the magnet groove, the rotor assembly is potted with glue on one side of the first limiting part.

[0018] The present invention also provides an electric motor comprising the aforementioned rotor assembly.

[0019] The magnetic steel limiting device, rotor assembly, and motor provided by this invention have the following beneficial effects: 1. This invention, through the provision of a magnet limiting device, comprising a support body, a first limiting part, and a second limiting part, can accommodate and limit the magnet. This allows the magnet to be assembled with the limiting device before being placed into the magnet slot of the rotor core. Conversely, when disassembling the magnet, the magnet and the limiting device can be disassembled together from the magnet slot, improving the efficiency of magnet assembly and disassembly. Furthermore, after the magnet is assembled with the rotor core, it can be easily removed from the magnet slot, increasing the ease of disassembly. It eliminates the need for methods such as potting adhesive bonding, rotor potting, or riveting to fix the magnet; the magnet can be directly placed into the rotor core for limiting and fixing. This invention is applicable to various rotor assembly situations. When the rotor radius is small, the magnet fixing method can solely utilize the fixing scheme of this invention; when… When the rotor radius is large and glue must be applied to address heat dissipation issues, the magnet fixing scheme of this invention first fixes the magnet before applying the glue, ensuring that the magnet will not pop out during glue application. The fixing method provided by this invention is reliable, reduces rotor costs, decreases rotor production process steps, and improves efficiency. It effectively solves the problem of difficult disassembly of magnets after installation in existing motor rotors; it also solves the problem of complex magnet installation and limiting fixing processes; it also solves the problem of high magnet fixing costs; it also solves the problem of magnets popping out due to mutual repulsion during rotor core glue application; and it also solves the problem of missing magnets during installation. Since the limiting bracket has upper and lower limiting plates, it can effectively limit the axial displacement of the magnet, thus eliminating the need for the rotor baffle on one side of the limiting plate, and also solving the problem of the rotor baffle occupying the axial internal space of the motor.

[0020] 2. The present invention further provides a third limiting part connected to the main body of the bracket, which can effectively engage and limit the rotor core on one side of the axial end face. This ensures that the magnet limiting device, after fixing the magnet, is further fixed into the magnet slot of the rotor core by the third limiting part, preventing it from falling off. Furthermore, the third limiting part is an elastic structure, allowing for operation to release the engagement with the rotor core as needed, thus facilitating the removal of the magnet and the magnet limiting device from the rotor core. The present invention also provides a disassembly hole on the rotor baffle, positioned opposite the third limiting part, allowing for easy manipulation of the third limiting part with tools to release the engagement between the third limiting part and the rotor core, thereby facilitating the removal of the magnet and the magnet limiting device. Finally, the present invention further improves the fixing effect by applying adhesive to the rotor assembly after assembling the magnet and the magnet limiting device, thereby achieving the integration of the rotor core, magnet, and magnet limiting device into a single unit. Attached Figure Description

[0021] Figure 1 This is an exploded structural diagram of the rotor assembly with a magnetic steel limiting device according to the present invention; Figure 2 yes Figure 1 A three-dimensional structural diagram of the magnetic steel limiting device in the image; Figure 3 yes Figure 1 A schematic diagram of the front structure of the magnetic steel limiting device in the middle; Figure 4 This is a structural diagram of the magnet limiting device and the magnet after they are integrally assembled into the magnet groove according to the present invention; Figure 5 This is a structural diagram of the magnet limiting device and the magnet during the assembly process of the present invention; Figure 6 yes Figure 4 A partial structural diagram of the third limiting part after the magnetic steel limiting device is assembled in place; Figure 7 yes Figure 5 A partial structural diagram of the third limiting part after the magnetic steel limiting device is assembled in place; Figure 8 yes Figure 1 The structural diagram of the rotor baffle.

[0022] The reference numerals in the attached figures are as follows: 1. Rotor baffle; d: disassembly and assembly hole; 2. Rotor core; 3. Magnet limiting device; 30. Support body; a: Third limiting part; b. Second limiting part; c. First limiting part; e. Limiting structure; 4. Magnet; 5. Magnet groove. Detailed Implementation

[0023] 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 some embodiments of the present invention, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present invention or its application or use. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0024] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0025] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of the invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following figures denote similar items; therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0026] In the description of this invention, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is generally based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this invention and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this invention; the directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0027] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0028] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore should not be construed as limiting the scope of protection of this invention.

[0029] like Figure 1-8As shown, the present invention provides a magnetic steel limiting device, which includes: The support body 30, the first limiting part c, and the second limiting part b are connected to the support body 30 and extend in a first direction, and the second limiting part b is connected to the support body 30 and extends in a second direction, so that the support body 30, the first limiting part c, and the second limiting part b can form a space to accommodate at least part of the structure of the magnet 4. The magnet 4 can be assembled with the support body 30, the first limiting part c, and the second limiting part b as a whole and then assembled into the magnet slot 5 of the rotor core 2. When disassembly is required, the magnet 4 can be detached from the magnet slot 5 as a whole from the support body 30, the first limiting part c, and the second limiting part b.

[0030] This invention, through the provision of a magnet limiting device, comprising a support body, a first limiting part, and a second limiting part, can accommodate and limit the magnet. This allows the magnet to be assembled with the rotor core after being limited and integrated by the magnet limiting device. Conversely, when disassembling the magnet, the magnet and the limiting device can be disassembled together from the magnet slot, improving the efficiency of magnet assembly and disassembly. Furthermore, after the magnet is assembled with the rotor core, it can be easily removed from the magnet slot, increasing the ease of disassembly. It eliminates the need for methods such as potting adhesive bonding, rotor potting, or riveting to fix the magnet; the magnet can be directly placed into the rotor core for limiting and fixing. This invention is applicable to various rotor assembly situations. When the rotor radius is small, the magnet fixing method can solely utilize the fixing scheme of this invention; when the rotor radius is small... When the rotor radius is large and glue must be applied to address heat dissipation issues, the magnet fixing scheme of this invention first fixes the magnet before applying the glue, ensuring that the magnet will not pop out during glue application. The fixing method provided by this invention is reliable, reduces rotor cost, decreases rotor production process steps, and improves efficiency; it effectively solves the problem of difficult disassembly of magnets after installation in existing motor rotors; it also solves the problem of complex magnet installation and limiting fixing processes; it also solves the problem of high magnet fixing costs; it also solves the problem of magnets popping out due to mutual repulsion during rotor core glue application; it also solves the problem of missing magnets during installation; since the limiting bracket has upper and lower limiting plates, it can effectively limit the axial displacement of the magnet, thus eliminating the need for the rotor baffle on one side of the upper limiting plate, and also solving the problem of the rotor baffle occupying the axial internal space of the motor.

[0031] This invention provides a magnet limiting mechanism that uses a movable magnet limiting bracket to limit and fix the magnet. The bracket has a simple structure, is easy to manufacture and assemble, can effectively limit the axial displacement of the magnet, facilitates subsequent rotor maintenance, improves the yield rate of rotor core production, reduces costs, and simplifies the production process.

[0032] In some implementations... The first limiting part c includes a first plate, which can face one axial end face of the magnet 4 and limit one axial end face of the magnet 4. The second limiting part b includes a second plate, which can face the other axial end face of the magnet 4 and limit the other axial end face of the magnet 4.

[0033] This is a preferred structural form of the first limiting part and the second limiting part of the present invention. That is, by having the first plate facing the axial end face of the magnet, the axial end face of the magnet can be limited. By having the second plate facing the axial end face of the magnet, the axial end face of the magnet can be effectively limited. This ensures that the magnet limiting device can limit and fix the magnet as a whole, which makes it convenient for the magnet to be quickly and accurately assembled into the magnet slot, and also allows the magnet to be quickly and effectively removed from the magnet slot when it needs to be disassembled.

[0034] The magnet of the present invention is preferably a rectangular column structure, and its projection in the axial end face of the rotor core is a rectangle, which includes a long side and a wide side. The support body preferably includes a plate-like structure, which is inserted into the magnet slot and located on one side of the wide side of the magnet, and contacts the surface of the wide side of the magnet extending axially, so that the magnet is limited and wrapped on the upper, lower and side sides by the support body and the first and second limiting parts, and assembled into one piece, which facilitates the installation and disassembly of the magnet.

[0035] In some implementations... The first limiting part c is connected to one end of the bracket body 30, and the second limiting part b is connected to the other end of the bracket body 30; The first direction and the second direction are the same direction. The first limiting part c and the second limiting part b are opposite to each other along the axial direction of the rotor core 2, and the plate surface of the first plate opposite to the magnet 4 and the plate surface of the second plate opposite to the magnet 4 are parallel.

[0036] This is a preferred structural form of the first and second limiting parts of the present invention. They are respectively connected to both ends of the support body, which can effectively limit the axial end faces of the magnet. The first and second limiting parts extend in the same direction, which can form a limiting structure in which the support body is located on one side of the magnet, and the upper and lower limiting parts extend towards the magnet, thereby effectively limiting the upper and lower axial end faces of the magnet and improving the efficiency of assembling and disassembling the magnet.

[0037] In some implementations... It also includes a third limiting part a, which is connected to the support body 30 and extends in a third direction, which is opposite to the first direction. After the magnet limiting device and the magnet 4 are integrally assembled onto the rotor core 2, the third limiting part a can be engaged with one end face of the rotor core 2 along the axial direction.

[0038] The present invention further utilizes the third limiting part connected to the main body of the bracket, which can achieve the effect of locking and limiting with the end face of the rotor core on one side along the axial direction. This ensures that after the magnet limiting device limits and fixes the magnet, it is then limited and fixed into the magnet slot of the rotor core by the third limiting part, and will not fall off.

[0039] In some implementations... The third limiting part a is an elastic structure. When the magnet 4 needs to be assembled with the rotor core 2, the third limiting part a can move from the magnet groove 5 to one axial end face of the rotor core 2 and be locked onto the axial end face of the rotor core 2 by its elasticity. When the magnet 4 needs to be removed from the rotor core 2, the third limiting part a can be driven to elastically lock into the magnet groove 5, for removing the magnet limiting device and the magnet 4 from the magnet groove 5.

[0040] The present invention also features a preferred third limiting part that is an elastic structure, which can be operated as needed to release the locking and limiting relationship with the rotor core, thereby achieving the effect of facilitating the removal of the magnet and the magnet limiting device from the rotor core.

[0041] The magnet limiting bracket of this invention is used to limit and fix magnets. The magnet limiting bracket has a spring piece (third limiting part) for position fixing and two limiting plates (first and second limiting parts). The limiting bracket is placed in the magnet slot on the rotor, and the magnet is installed. After installation, the bracket is pushed in until the lower limiting plate enters the disassembly slot on the rotor baffle. At this point, the spring piece pops out, locking the rotor core, and the magnet limiting bracket enters the limiting state, thus fixing the magnet. The spring piece can be pushed into the magnet slot to enter the non-limiting state, and then the magnet limiting bracket and magnet can be pushed out, facilitating magnet replacement.

[0042] In some implementations... The third limiting part a is a rigid structure that is bent to generate elastic force. One end of the third limiting part a is connected to the support body 30, and the other end of the third limiting part a is formed as a snap-fit ​​limiting surface parallel to one end face of the rotor core 2.

[0043] This is a further preferred structural form of the third limiting part of the present invention, namely, a bending structure formed by bending, which can generate elastic force. After it moves beyond the axial end face of the rotor core, it can automatically spring back to the axial end face of the rotor core to engage with it, thus completing the engagement and limiting effect between the magnet limiting device, the magnet and the rotor core, and preventing it from falling off during operation.

[0044] In some implementations... The third limiting part a and the second limiting part b are located on opposite sides of the support body 30, that is, the second limiting part b is located on one side of the support body 30 in the first direction, and the third limiting part a is located on one side of the support body 30 in the third direction, and the position of the third limiting part a is opposite to the position of the second limiting part b. The first limiting part c is connected to one end of the bracket body 30, and the second limiting part b is connected to the other end of the bracket body 30.

[0045] This is a further preferred structural form of the third limiting part of the present invention, that is, it is set at a position opposite to the position of the second limiting part, and the extension direction is opposite to the direction of the second limiting part. The second limiting part can lock and limit the axial end face of the magnet, while the third limiting part can lock and limit the axial end face of the rotor core, ensuring that the magnet can be limited at the same time, and the magnet limiting device can be locked and limited onto the rotor core.

[0046] In some implementations... The first limiting part c also has a limiting structure e extending toward the third direction at the position where it is connected to the support body 30. The limiting structure e can be engaged with the other end face of the rotor core 2 in the axial direction or abut against the inner wall surface of the magnet groove 5.

[0047] The present invention further preferably uses the above-mentioned limiting structure to form a limiting effect on the other side of the rotor core by engaging with the other end face of the rotor core or abutting against the inner wall of the magnet slot, thereby further improving the limiting effect between the magnet and the rotor core.

[0048] The present invention also provides a rotor assembly, which includes the aforementioned magnet limiting device, and further includes a magnet 4 and a rotor core 2. The rotor core 2 is provided with a magnet groove 5. The magnet 4 and the magnet limiting device are assembled as one unit and then assembled into the magnet groove 5. When disassembly is required, the magnet 4 and the magnet limiting device can be disassembled from the magnet groove 5 as a whole.

[0049] This invention provides a novel magnet fixing device and rotor assembly. It eliminates the need for methods such as potting adhesive bonding, rotor glue injection, and riveting to fix the magnets. The magnets are directly placed into the rotor core for precise positioning and fixing. This method is applicable to various rotor assembly situations. When the rotor radius is small, the magnet fixing method of this invention can be used alone. When the rotor radius is large and glue injection is necessary to address heat dissipation issues, using the magnet fixing method of this invention to pre-fix the magnets ensures that they will not pop out during glue injection. The fixing method provided by this invention is reliable, reduces rotor costs, decreases rotor manufacturing process steps, and improves efficiency.

[0050] This invention can solve the following problems: 1. Solve the problem of difficulty in disassembling and replacing rotor magnets after installation; 2. To solve the problem of complex current magnet installation and fixing processes; 3. Solve the problem of high fixing costs for magnets; 4. Solve the problem of magnets repelling and popping out during the current process of applying glue to the rotor core; 5. Resolve the issue of missing magnets during installation; 6. Solve the problem of the rotor baffle occupying the axial internal space of the motor.

[0051] In some implementations... It also includes a rotor baffle 1, which is disposed on one side end face of the rotor core 2, and the rotor baffle 1 is provided with a disassembly hole d, which is opposite to the magnet slot 5. When the magnet limiting device also includes a third limiting part a, the disassembly hole d is also opposite to the third limiting part a.

[0052] The present invention, through the preferred disassembly hole provided on the rotor baffle at the position opposite to the third limiting part, facilitates the use of tools to insert into the disassembly hole to operate the third limiting part to release the locking and limiting between the third limiting part and the rotor core, so as to achieve the purpose of disassembling the magnet and the magnet limiting device.

[0053] This invention features mounting and dismounting holes on the rotor baffle for assembling and disassembling the magnets. Even after the rotor baffle is installed, the magnets can still be assembled and disassembled. When a magnet is incorrectly installed and needs replacement, a tool is used to push the spring clip on the limiting bracket into the magnet slot within the mounting and dismounting holes on the rotor baffle. Simultaneously, a push pin is used to push the lower limiting plate of the bracket upwards, thus pushing the magnet limiting bracket and the magnet out of the rotor for magnet replacement.

[0054] In some implementations... After the magnet 4 and the magnet limiting device are integrally assembled into the magnet groove 5, the rotor assembly is potted with glue on one side of the first limiting part c.

[0055] Furthermore, the present invention further preferably employs the method of potting glue on the rotor assembly after assembling the magnet and the magnet limiting device as described above, which can further realize the assembly of the rotor core, magnet, and magnet limiting device into one unit and further improve the fixing effect.

[0056] This invention eliminates the need for complex processes such as using potting compound to bond the magnets to the rotor or hot-plastic molding during magnet assembly. This reduces rotor core production costs, process steps, and axial length, resulting in a more compact motor space. It also prevents magnets from popping out due to mutual repulsion during potting and avoids missing magnets during installation. After magnet installation, replacement and maintenance can be performed later.

[0057] The present invention also provides an electric motor comprising the aforementioned rotor assembly.

[0058] like Figure 1 The diagram shown is a cross-sectional view of the magnetic steel limiting mechanism components of the present invention. The entire magnetic steel limiting mechanism consists of a rotor baffle 1 (with disassembly hole d), a rotor core 2, a magnetic steel limiting device 3 (magnetic steel limiting bracket), and a magnet 4. Figure 2 The diagram shows a detailed view of the magnetic steel limiting bracket. The bracket body 30 of the magnetic steel limiting device 3 is equipped with a third limiting part a (preferably a spring piece), a second limiting part b (preferably a lower limiting plate), and a first limiting part c (preferably an upper limiting plate). Figure 8 The diagram shows a detailed view of the rotor baffle 1. The rotor baffle 1 is provided with a disassembly hole d. A special tool can be used to push the spring back and forth to achieve the limited and non-limited states of the magnet 4. During installation, the magnet limiting device 3 containing the magnet is pushed into the magnet slot on the rotor until the lower limiting plate reaches the disassembly hole d of the rotor baffle. The spring then enters the limited state, locking the rotor core 2 and achieving the limitation of the magnet. When it is necessary to move the magnet limiting device 3 to the non-limited state, a special tool can be used to push the spring into the magnet slot on the rotor core 2, and then the lower limiting plate can be pushed upward with a pin to push out the limiting bracket and the magnet for replacement. This achieves the limitation and non-limited states of the magnet. When the motor rotor needs to be potted, the magnet limit device 3 can be in the limit state. At this time, the motor rotor can be potted through the side of the rotor core without the rotor baffle. At this time, the magnet limit device 3 effectively restricts the axial displacement of the magnet, which can prevent the magnet from popping out due to the repulsion of the like poles of the magnet during the potting process.

[0059] The installation sequence of the magnet fixing mechanism of the present invention is as follows: the rotor baffle 1 (with disassembly hole) is first installed into the motor rotor shaft, the rotor core 2 is installed into the motor rotor shaft, the magnet limiting device 3 is placed in the magnet slot of the rotor core 2, but the magnet limiting device 3 is not pushed into the bottom rotor baffle at this time, the magnets 4 are placed in sequence, and after the placement is completed, the magnet limiting device 3 is pushed into the disassembly hole of the bottom rotor baffle. At this time, the spring pops out and locks the rotor core 2. The magnet limiting device 3 is in the limiting state, realizing the fixing and limiting of the magnet.

[0060] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention. The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the protection scope of the present invention.

Claims

1. A magnetic steel limiting device, characterized in that: include: The bracket body (30), the first limiting part (c), and the second limiting part (b) are connected to the bracket body (30) and extend in a first direction, and the second limiting part (b) is connected to the bracket body (30) and extends in a second direction, so that the bracket body (30), the first limiting part (c), and the second limiting part (b) can form a space for accommodating at least a portion of the structure of the magnet (4). The magnet (4) can be assembled with the bracket body (30), the first limiting part (c), and the second limiting part (b) as a whole and then assembled into the magnet slot (5) of the rotor core (2). When disassembly is required, the magnet (4) can be disassembled from the magnet slot (5) as a whole with the bracket body (30), the first limiting part (c), and the second limiting part (b). It also includes a third limiting part (a), which is connected to the support body (30) and extends in a third direction, which is opposite to the first direction. After the magnet limiting device and the magnet (4) are integrally assembled onto the rotor core (2), the third limiting part (a) can be engaged with one end face of the rotor core (2) in the axial direction. The third limiting part (a) is an elastic structure. When the magnet (4) needs to be assembled with the rotor core (2), the third limiting part (a) can move from the magnet groove (5) to the axial end face of the rotor core (2) and be locked onto the axial end face of the rotor core (2) by its elasticity. When the magnet (4) needs to be removed from the rotor core (2), the third limiting part (a) can be driven to elastically lock into the magnet groove (5) to remove the magnet limiting device and the magnet (4) from the magnet groove (5). The first limiting part (c) also has a limiting structure (e) extending toward the third direction at the position where it is connected to the support body (30). The limiting structure (e) can be engaged with the other end face of the rotor core (2) in the axial direction or abut against the inner wall surface of the magnet groove (5).

2. The magnetic steel limiting device according to claim 1, characterized in that: The first limiting part (c) includes a first plate, which is able to face one side of the axial end face of the magnet (4) and limit one side of the axial end face of the magnet (4). The second limiting part (b) includes a second plate, which is able to face the other side of the axial end face of the magnet (4) and limit the other side of the axial end face of the magnet (4).

3. The magnetic steel limiting device according to claim 2, characterized in that: The first limiting part (c) is connected to one end of the support body (30), and the second limiting part (b) is connected to the other end of the support body (30); The first direction and the second direction are the same direction. The first limiting part (c) and the second limiting part (b) are opposite to each other along the axial direction of the rotor core (2). The plate surface of the first plate opposite to the magnet (4) and the plate surface of the second plate opposite to the magnet (4) are parallel.

4. The magnetic steel limiting device according to claim 1, characterized in that: The third limiting part (a) is a rigid structure that is bent to generate elastic force. One end of the third limiting part (a) is connected to the support body (30), and the other end of the third limiting part (a) is formed as a snap-fit ​​limiting surface parallel to one end face of the rotor core (2) along the axial direction.

5. The magnetic steel limiting device according to claim 1, characterized in that: The third limiting part (a) and the second limiting part (b) are located on opposite sides of the support body (30), that is, the second limiting part (b) is located on one side of the support body (30) in the first direction, and the third limiting part (a) is located on one side of the support body (30) in the third direction, and the position of the third limiting part (a) is opposite to the position of the second limiting part (b). The first limiting part (c) is connected to one end of the support body (30), and the second limiting part (b) is connected to the other end of the support body (30).

6. A rotor assembly, characterized in that: The magnetic steel limiting device according to any one of claims 1-5 further includes a magnetic steel (4) and a rotor core (2), wherein a magnetic steel groove (5) is provided on the rotor core (2), the magnetic steel (4) is assembled with the magnetic steel limiting device as a whole and then assembled into the magnetic steel groove (5), and the magnetic steel (4) and the magnetic steel limiting device can be disassembled from the magnetic steel groove (5) as a whole when disassembly is required.

7. The rotor assembly according to claim 6, characterized in that: It also includes a rotor baffle (1), which is located on one side of the axial end face of the rotor core (2), and the rotor baffle (1) is provided with a disassembly hole (d), which is opposite to the magnet slot (5). When the magnet limiting device also includes a third limiting part (a), the disassembly hole (d) is also opposite to the third limiting part (a).

8. The rotor assembly according to claim 6, characterized in that: After the magnet (4) and the magnet limiting device are integrally assembled into the magnet groove (5), the rotor assembly is potted with glue on one side of the first limiting part (c).

9. An electric motor, characterized in that: The rotor assembly included in any one of claims 6-8.

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