Rotor assembly and electric machine

Abstract

The utility model provides a kind of rotor assembly and motor.The rotor assembly includes: rotating shaft (1);Sleeve (2), fixedly cover and set on rotating shaft (1), the first end of sleeve (2) is provided with axial limit structure (3);Rotor structure (4), detachably cover and set on sleeve (2), first end is axially stopped by axial limit structure (3) Limiting;Stop convex ring (5), it is set on rotating shaft (1), stop convex ring (5) the second end of rotor structure (4) is axially limited;Anti-rotation structure, it is set on at least one of rotating shaft (1), sleeve (2) and stop convex ring (5), for with rotor structure (4) cooperation, limit the circumferential movement of rotor structure (4) relative rotating shaft (1).According to the rotor assembly of the utility model, when rotating shaft is damaged, rotor structure can be nondestructively disassembled from rotating shaft, improve the reusability of rotor structure, reduce resource waste.

Description

Technical Field

[0001] This utility model relates to the field of motor technology, and more specifically, to a rotor assembly and a motor. Background Technology

[0002] Permanent magnet synchronous motors (PMSMs), as one of the core drive devices in modern industrial automation, occupy an indispensable position in robot joint drives, precision machine tools, aerospace, new energy vehicles, and various high-end automated equipment due to their superior power density, high-precision positioning capabilities, and rapid speed response characteristics. The core advantage of this type of motor lies in its use of high-performance neodymium iron boron permanent magnets, which provide a strong magnetic field, enabling miniaturization and high-efficiency operation, thus significantly reducing the size and weight of the motor while maintaining the same output power. However, this advantage comes at the cost of a significant reliance on rare earth resources.

[0003] Neodymium iron boron (NdFeB) magnets are primarily composed of neodymium, iron, and boron. Neodymium is a rare earth element with extremely uneven global distribution. Its extraction and refining processes are complex and costly, and its environmental impact is significant. With the surge in global demand for new energy and automation technologies, the demand for rare earth resources, especially neodymium, is growing exponentially. This intensifies global competition for rare earth resources, driving up the price of NdFeB magnets and directly increasing the overall production cost of permanent magnet synchronous motors.

[0004] In the manufacturing process of permanent magnet synchronous motors, rotor assembly is a crucial step. In traditional processes, the rotor core and permanent magnets are glued together and fixed to the shaft using a heat-shrink fitting method, forming a single unit. While this method ensures motor stability and efficiency to some extent, if the shaft wears, deforms, or is damaged during production or later use, requiring shaft replacement, the traditional rotor structure cannot be disassembled non-destructively. This forces the entire rotor, including the valuable permanent magnets, to be scrapped, resulting in a significant waste of resources, especially given the current scarcity of rare earth resources. Utility Model Content

[0005] The main purpose of this invention is to provide a rotor assembly and motor that can disassemble the rotor structure from the shaft without damage when the shaft is damaged, thereby improving the reusability of the rotor structure and reducing resource waste.

[0006] To achieve the above objectives, according to one aspect of the present invention, a rotor assembly is provided, comprising:

[0007] Shaft;

[0008] A bushing is fixedly fitted onto a rotating shaft, and an axial limiting structure is provided at the first end of the bushing.

[0009] The rotor structure is detachably fitted onto the bushing, and the first end of the rotor structure is axially stopped and limited by an axial limiting structure.

[0010] A stop ring is installed on the rotating shaft and located at the second end of the bushing. The stop ring axially limits the second end of the rotor structure.

[0011] An anti-rotation structure is provided on at least one of the rotating shaft, bushing, and stop ring, and is used to cooperate with the rotor structure to limit the circumferential movement of the rotor structure relative to the rotating shaft.

[0012] Furthermore, the axial limiting structure is a stop protrusion set at the first end of the bushing. The inner ring of the rotor structure is provided with a positioning groove, which penetrates the rotor structure axially. The stop protrusion and the positioning groove are in clearance fit. The rotor structure can be sleeved on the bushing through the positioning groove along the stop protrusion. After the rotor structure is sleeved on the bushing, the positioning groove and the stop protrusion are circumferentially misaligned, and the rotor structure is axially stopped and limited by the stop protrusion.

[0013] Furthermore, a positioning hole is provided on the stop ring, and the anti-rotation structure is positioned and engaged with the positioning groove of the rotor structure through the positioning hole after the rotor structure rotates to a preset angle.

[0014] Furthermore, a positioning hole is provided on the stop ring, and the anti-rotation structure includes a positioning block and a connecting piece. The positioning block is sleeved on the rotating shaft, and the rotor structure is axially limited between the axial limiting structure and the positioning block. An axial protrusion is provided on the side of the positioning block facing the rotor structure. The axial protrusion is embedded in the positioning groove and forms a circumferential limit on the rotor structure. A connecting hole is provided on the side of the positioning block away from the rotor structure. The connecting piece passes through the positioning hole and is fixedly connected to the connecting hole.

[0015] Furthermore, the positioning hole is a threaded hole, the connecting hole is a blind hole, the connecting part is a bolt, the bolt is threadedly connected to the positioning hole, and the part of the bolt extending into the connecting hole tightens against the positioning block.

[0016] Furthermore, there are multiple positioning holes, which are arranged at intervals along the circumference of the stop ring, and each positioning hole is equipped with a bolt.

[0017] Furthermore, the number of positioning grooves is an integer multiple of the number of stop protrusions, and there is at least one set of positioning grooves, with the position of each set of positioning grooves matching the position of the stop protrusions.

[0018] Furthermore, there are two stop protrusions, which are located at both ends of the same diameter of the bushing and are symmetrical about the central axis of the rotating shaft.

[0019] Furthermore, the bushing is heat-fitted onto the rotating shaft.

[0020] According to another aspect of the present invention, an electric motor is provided, including the electric motor described above.

[0021] Applying the technical solution of this utility model, the rotating shaft is the core component in the motor that transmits rotational motion. A bushing is fixedly fitted onto the rotating shaft, and its first end is provided with an axial limiting structure to restrict the axial movement of the rotor structure, ensuring the accurate axial position of the rotor structure. The rotor structure is detachably fitted onto the bushing. When the rotating shaft is damaged, the bushing can be removed from the rotating shaft, and then the rotor structure can be removed from the bushing. Since the rotor structure is not directly heat-fitted onto the rotating shaft, even if the bushing is damaged, it will not affect the rotor structure when removing the bushing. Therefore, when replacing the rotating shaft, the rotor structure can be easily disassembled from the rotating shaft without... The rotor core and permanent magnets that are damaged in the rotor structure are improved, the reuse rate of the rotor core and permanent magnets is increased, resource waste is reduced, and production costs are lowered. The first end of the rotor structure is axially stopped and limited by an axial limiting structure. The stop convex ring is set on the rotating shaft and located at the second end of the bushing to axially limit the second end of the rotor structure. In cooperation with the axial limiting structure, the stability of the rotor structure in the axial direction can be ensured. The anti-rotation structure is set on at least one of the rotating shaft, bushing, and stop convex ring. It is used to cooperate with the rotor structure to limit the circumferential movement of the rotor structure relative to the rotating shaft and ensure the stability of the rotor structure during motor operation. Attached Figure Description

[0022] The accompanying drawings, which form part of this specification, are used to provide a further understanding of this utility model. The illustrative embodiments and descriptions of this utility model are used to explain this utility model and do not constitute an undue limitation thereof. In the drawings:

[0023] Figure 1 An exploded view of the rotor assembly according to an embodiment of the present invention is shown.

[0024] Figure 2 A cross-sectional view of the rotor assembly according to an embodiment of the present invention is shown.

[0025] Figure 3 A schematic diagram of the rotor structure of the rotor assembly according to an embodiment of the present invention is shown;

[0026] Figure 4 A schematic diagram of the structure of the bushing of the rotor assembly according to an embodiment of the present invention is shown;

[0027] Figure 5 A schematic diagram of the structure of the first end of the positioning block of the rotor assembly according to an embodiment of the present invention is shown;

[0028] Figure 6A schematic diagram of the second end of the positioning block of the rotor assembly according to an embodiment of the present invention is shown;

[0029] Figure 7 A three-dimensional structural schematic diagram of the bushing of the rotor assembly according to an embodiment of the present invention is shown.

[0030] The above figures include the following reference numerals:

[0031] 1. Shaft; 2. Bushing; 3. Axial limiting structure; 4. Rotor structure; 5. Stop ring; 6. Positioning groove; 7. Positioning hole; 8. Positioning block; 9. Connecting piece; 10. Connecting hole; 11. Axial protrusion; 12. Rotor core; 13. Permanent magnet. Detailed Implementation

[0032] It should be noted that, where there is no conflict, the embodiments and features in the embodiments of this utility model can be combined with each other. The present utility model will now be described in detail with reference to the accompanying drawings and embodiments.

[0033] See also Figures 1 to 7 As shown, according to an embodiment of the present invention, the rotor assembly includes: a rotating shaft 1; a bushing 2, fixedly sleeved on the rotating shaft 1, with an axial limiting structure 3 at the first end of the bushing 2; a rotor structure 4, detachably sleeved on the bushing 2, with the first end of the rotor structure 4 axially stopped and limited by the axial limiting structure 3; a stop ring 5, disposed on the rotating shaft 1 and located at the second end of the bushing 2, with the stop ring 5 axially limiting the second end of the rotor structure 4; and an anti-rotation structure, disposed on at least one of the rotating shaft 1, the bushing 2, and the stop ring 5, for cooperating with the rotor structure 4 to limit the circumferential movement of the rotor structure 4 relative to the rotating shaft 1.

[0034] The rotating shaft 1 is the core component in the motor that transmits rotational motion. A bushing 2 is fixedly fitted onto the rotating shaft 1, and its first end is equipped with an axial limiting structure 3 to restrict the axial movement of the rotor structure 4, ensuring the accurate axial position of the rotor structure 4. The rotor structure 4 is detachably fitted onto the bushing 2. If the rotating shaft 1 is damaged, the bushing 2 can be removed from the rotating shaft 1, and then the rotor structure 4 can be removed from the bushing 2. Since the rotor structure 4 is not directly heat-fitted onto the rotating shaft 1, even if the bushing 2 is damaged, it will not affect the rotor structure 4. Therefore, when replacing the rotating shaft 1, the rotor structure 4 can be easily removed from the rotating shaft 1 without damaging the rotor core 12 and permanent magnet 13, improving the reusability of the rotor core 12 and permanent magnet 13, reducing resource waste, and lowering production costs. The first end of the rotor structure 4 is axially stopped and limited by the axial limiting structure 3. The stop ring 5 is disposed on the rotating shaft 1 and located at the second end of the bushing 2, axially limiting the second end of the rotor structure 4. In cooperation with the axial limiting structure 3, the rotor structure 4 can be ensured to be axially stable. The anti-rotation structure is disposed on at least one of the rotating shaft 1, the bushing 2, and the stop ring 5, and is used to cooperate with the rotor structure 4 to limit the circumferential movement of the rotor structure 4 relative to the rotating shaft 1, thus ensuring the stability of the rotor structure 4 during motor operation.

[0035] In one embodiment, the axial limiting structure 3 is a stop protrusion provided at the first end of the bushing 2. The inner ring of the rotor structure 4 is provided with a positioning groove 6, which penetrates the rotor structure 4 axially. The stop protrusion and the positioning groove 6 are in clearance fit. The rotor structure 4 can be sleeved on the bushing 2 along the stop protrusion through the positioning groove 6. After the rotor structure 4 is sleeved on the bushing 2, the positioning groove 6 and the stop protrusion are circumferentially misaligned, and the rotor structure 4 is axially stopped and limited by the stop protrusion.

[0036] The stop protrusion and the positioning groove 6 are in clearance fit, allowing the rotor structure 4 to be fitted onto the bushing 2 along the stop protrusion via the positioning groove 6. After the rotor structure 4 is fitted onto the bushing 2, the positioning groove 6 and the stop protrusion are circumferentially misaligned. This misalignment design allows the rotor structure 4 to be axially stopped and limited by the stop protrusion, effectively preventing the rotor structure 4 from moving in the axial direction and ensuring the smooth operation of the motor.

[0037] In one embodiment, the stop ring 5 is provided with a positioning hole 7. After the rotor structure 4 rotates to a preset angle, the anti-rotation structure is positioned and engaged with the positioning groove 6 of the rotor structure 4 through the positioning hole 7.

[0038] When the rotor structure 4 rotates to a specific preset angle, the positioning hole 7 on the stop ring 5 is precisely aligned and cooperates with the positioning groove 6 of the inner ring of the rotor structure 4 to form an anti-rotation structure, which effectively restricts the unexpected movement of the rotor in the circumferential direction. This ensures that the rotor maintains a stable radial and circumferential position while being axially positioned, thereby ensuring the accuracy and reliability of the motor operation. At the same time, this design also facilitates the disassembly and maintenance of the rotor assembly, improves the reusability of the permanent magnet, and reduces production costs.

[0039] In one embodiment, the anti-rotation structure includes a locking screw. The rotor structure 4 has a locking hole on the side facing the stop protrusion 5. When it is sleeved on the bushing 2 and rotated at a preset angle to form a stop engagement with the stop protrusion, the locking screw can be inserted into the locking hole through the positioning hole 7 to lock the rotor structure 4, so that the rotor structure 4 can be fixed in the circumferential position relative to the rotating shaft 1.

[0040] In one embodiment, the stop ring 5 is provided with a positioning hole 7, and the anti-rotation structure includes a positioning block 8 and a connecting piece 9. The positioning block 8 is sleeved on the rotating shaft 1, and the rotor structure 4 is axially limited between the axial limiting structure 3 and the positioning block 8. The side of the positioning block 8 facing the rotor structure 4 is provided with an axial protrusion 11, which is embedded in the positioning groove 6 and forms a circumferential limit on the rotor structure 4. The side of the positioning block 8 away from the rotor structure 4 is provided with a connecting hole 10, and the connecting piece 9 passes through the positioning hole 7 and is fixedly connected to the connecting hole 10.

[0041] The stop ring 5 cooperates with the positioning block 8 through the positioning hole 7. The axial protrusion 11 on the positioning block 8 is embedded into the positioning groove 6 of the rotor structure 4 to form a stable circumferential limit. At the same time, the connecting piece 9 passes through the positioning hole and is connected and fastened to the connecting hole 10 on the positioning block. This ensures the precise fixation of the rotor structure 4 in the axial position and the effective restraint of circumferential movement, which significantly enhances the stability of the rotor assembly and the overall performance of the motor. It also facilitates disassembly and maintenance, reduces the waste of permanent magnets, and lowers production costs, reflecting the high efficiency and economy of the design.

[0042] exist Figure 2 The structure shown is an assembly diagram of the rotor structure 4, the bushing 2, and the positioning block 8. The diagram is only for illustrative purposes and shows the assembly relationship between the three components. In reality, the axial protrusion 11 on the positioning block 8 and the stop protrusion on the bushing 2 are circumferentially offset. This allows the stop protrusion to axially stop and limit the first end of the rotor structure 4, and the axial protrusion 11 to cooperate with the positioning groove 6 of the rotor structure 4 to form a circumferential limit on the rotor structure 4, preventing the rotor structure 4 from coming off the bushing 2.

[0043] In one embodiment, the positioning hole 7 is a threaded hole, the connecting hole 10 is a blind hole, the connecting piece 9 is a bolt, the bolt is threadedly connected to the positioning hole 7, and the part of the bolt extending into the connecting hole 10 presses against the positioning block 8.

[0044] By designing the positioning hole 7 as a threaded hole and the connecting hole 10 as a blind hole, and using bolts as connecting parts 9 to connect to the positioning hole threadedly, and tightening the connecting hole part into which the positioning block 8 extends, this structure not only ensures the axial firm positioning of the rotor structure 4 and the circumferential stable anti-rotation, but also greatly improves the disassembly and maintenance convenience of the rotor assembly due to the use of threaded fasteners. This allows for quick and non-destructive disassembly and reassembly of the rotor structure when replacing or repairing the shaft 1, effectively avoiding the waste of permanent magnets, reducing the production and maintenance costs of the motor, and improving resource utilization efficiency and motor reliability.

[0045] The connecting hole 10 can be a smooth hole or a threaded hole. When the connecting hole 10 is a smooth hole, after the bolt is inserted into the positioning hole 7, it engages with the thread of the positioning hole 7. By rotating the bolt, the bolt extends into the connecting hole 10. As the bolt rotates, it gradually reaches the bottom of the connecting hole 10 and presses against the bottom of the connecting hole 10, thereby pressing the positioning block 8 against the rotor structure 4. When the connecting hole 10 is a threaded hole, the direction of the thread is opposite to that of the thread of the positioning hole 7. When the bolt extends into the connecting hole 10 through the positioning hole 7 and is screwed into the connecting hole 10, the screwing of the bolt will engage with the thread of the connecting hole 10, pressing against the connecting hole 10 in the opposite direction, so that the positioning block 8 is pressed against the rotor structure 4.

[0046] After the rotor structure 4 is fitted onto the bushing 2 via the stop protrusion, a clearance fit is maintained between the axial protrusion 11 on the positioning block 8 and the end face of the rotor structure 4 to allow for rotational space. When the rotor structure 4 rotates to its final position, the axial protrusion 11 of the positioning block 8 extends into the positioning groove 6 of the rotor structure 4. Because the positioning block 8 has a large axial movement space, the axial protrusion 11 can easily protrude from the positioning groove 6, failing to provide effective circumferential positioning for the rotor structure 4. The aforementioned bolt structure allows adjustment of the axial position of the positioning block 8. The extension and retraction of the bolt compresses the axial movement space of the positioning block 8, ultimately pressing the positioning block 8 firmly onto the rotor structure 4, thus simultaneously limiting the rotor structure 4 axially and circumferentially, ensuring the structural stability and reliability of the rotor structure 4 during operation.

[0047] In one embodiment, there are multiple positioning holes 7, which are arranged at intervals along the circumference of the stop ring 5, and each positioning hole 7 is provided with a bolt.

[0048] Each of the multiple positioning holes 7, spaced apart circumferentially along the stop ring 5, is equipped with a bolt, forming a multi-point fixation. This greatly enhances the connection stability between the rotor structure 4 and the bushing 2. Even under high load or high speed operating conditions, it can effectively suppress the axial vibration and circumferential displacement of the rotor, ensuring the smoothness and accuracy of motor operation. At the same time, the multi-point bolt connection also provides redundant safety. Even if individual connections fail, the remaining connections can still maintain sufficient fastening force to maintain the integrity of the rotor assembly, further improving the reliability and service life of the motor, while also facilitating maintenance and adjustment.

[0049] In one embodiment, the number of positioning grooves 6 is an integer multiple of the number of stop protrusions, and there is at least one set of positioning grooves 6, the position of each set of positioning grooves 6 being matched with the position of the stop protrusions.

[0050] The number of positioning grooves 6 is designed to be an integer multiple of the number of stop protrusions, and at least one set is formed. The position of each set of positioning grooves is precisely matched with the corresponding stop protrusion, which ensures smooth alignment and firm fixation of the rotor structure 4 during installation. At the same time, multi-point matching is achieved through the matching of positioning grooves 6 and stop protrusions, which makes it convenient to select the appropriate positioning groove 6 according to the matching position of positioning groove 6 and stop protrusion, so as to realize the assembly of rotor structure 4 on bushing 2 and improve assembly efficiency.

[0051] In one embodiment, there are two stop protrusions, which are located at both ends of the same diameter of the bushing 2, and the two stop protrusions are symmetrical about the central axis of the rotating shaft 1.

[0052] Two stop protrusions are symmetrically arranged at both ends of the same diameter of the bushing 2. This symmetrical structure, with the guidance of the bushing 2, ensures that the rotor structure 4 is quickly and accurately positioned on the rotating shaft 1 during the installation of the rotor structure 4. At the same time, the symmetrically distributed stop protrusions provide balanced axial support force, effectively preventing axial sway of the rotor, ensuring the stability and quietness of the motor when rotating at high speed, improving the overall operating efficiency and power transmission accuracy. The symmetrical design also simplifies the assembly process.

[0053] In one embodiment, the bushing 2 is heat-fitted onto the rotating shaft 1.

[0054] The bushing 2 is tightly fixed to the rotating shaft 1 through a heat-fitting process. Utilizing the principle of material thermal expansion, an interference fit is achieved between the bushing 2 and the rotating shaft 1. This tight fit significantly improves the strength and rigidity of the connection between the two, ensuring that the bushing 2 and the rotating shaft 1 will not loosen or slip relative to each other when the motor is rotating at high speed or subjected to impact loads. This ensures the stability and reliability of the motor. At the same time, the heat-fitting process can also avoid the use of additional fasteners, reduce the number of parts, simplify the assembly process, and reduce production costs.

[0055] The assembly process of the rotor structure is as follows:

[0056] First, a rotating shaft 1 with a stop ring 5 is machined, and four evenly distributed threaded holes are machined on the stop ring 5 along the circumferential direction.

[0057] Next, the positioning block 8 is easily placed onto the rotating shaft 1 through the center hole. Since there is a clearance fit between the center hole and the rotating shaft 1, this step is easy to operate and does not affect the function of the positioning block 8.

[0058] Subsequently, after undergoing a heat expansion treatment, the bushing 2 is precisely heat-fitted onto the rotating shaft 1 until it reaches the fixed position of the stop ring 5. The length of the bushing 2 is designed to be longer than that of the rotor core 12, leaving room for the next step of the operation.

[0059] The positioning groove 6 on the rotor core 12 is aligned with the stop protrusion on the bushing 2, and it is initially installed into the bushing 2 through clearance fit. At this time, the axial protrusion 11 on the bushing 2 extends beyond the end face of the rotor core 12. Then, the rotor core 12 is rotated 90 degrees axially so that the stop protrusion on the bushing 2 is aligned with the end face of the rotor core 12, forming preliminary axial positioning and ensuring that the rotor core 12 cannot produce axial displacement.

[0060] The axial protrusion 11 on the positioning block 8 is aligned with the positioning groove 6 on the rotor core 12 to ensure that the rotor core 12 is firmly fixed in the circumferential and radial directions, preventing any radial movement during operation.

[0061] Finally, the screw passes through the threaded hole on the stop ring 5 of the rotating shaft 1 and is screwed into the connecting hole 10 on the positioning block 8. The connecting hole 10 tightly presses the rotor core 12 to form a stable connection, ensuring the reliability of the rotor assembly throughout the entire motor operating cycle.

[0062] According to an embodiment of the present invention, the motor includes the motor described above.

[0063] 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 the present invention. 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.

[0064] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this utility model are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this utility model described herein can be implemented in sequences other than those illustrated or described herein.

[0065] The above are merely preferred embodiments of this utility model and are not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A rotor assembly, characterized in that, include: Rotating shaft (1); A bushing (2) is fixedly sleeved on the rotating shaft (1), and an axial limiting structure (3) is provided at the first end of the bushing (2). The rotor structure (4) is detachably sleeved on the bushing (2), and the first end of the rotor structure (4) is axially stopped and limited by the axial limiting structure (3); A stop ring (5) is provided on the rotating shaft (1) and located at the second end of the bushing (2). The stop ring (5) axially limits the second end of the rotor structure (4). An anti-rotation structure is provided on at least one of the rotating shaft (1), the bushing (2), and the stop ring (5) for cooperating with the rotor structure (4) to limit the circumferential movement of the rotor structure (4) relative to the rotating shaft (1).

2. The rotor assembly according to claim 1, characterized in that, The axial limiting structure (3) is a stop protrusion provided at the first end of the bushing (2). The inner ring of the rotor structure (4) is provided with a positioning groove (6). The positioning groove (6) passes through the rotor structure (4) axially. The stop protrusion and the positioning groove (6) are in clearance fit. The rotor structure (4) can be sleeved on the bushing (2) along the stop protrusion through the positioning groove (6). After the rotor structure (4) is sleeved on the bushing (2), the positioning groove (6) and the stop protrusion are circumferentially misaligned. The rotor structure (4) is axially stopped and limited by the stop protrusion.

3. The rotor assembly according to claim 2, characterized in that, The stop ring (5) is provided with a positioning hole (7). After the rotor structure (4) rotates to a preset angle, the anti-rotation structure is positioned and engaged with the positioning groove (6) of the rotor structure (4) through the positioning hole (7).

4. The rotor assembly according to claim 2, characterized in that, The stop ring (5) is provided with a positioning hole (7). The anti-rotation structure includes a positioning block (8) and a connecting piece (9). The positioning block (8) is sleeved on the rotating shaft (1). The rotor structure (4) is axially limited between the axial limiting structure (3) and the positioning block (8). The positioning block (8) has an axial protrusion (11) on the side facing the rotor structure (4). The axial protrusion (11) is embedded in the positioning groove (6) and forms a circumferential limit on the rotor structure (4). The positioning block (8) has a connecting hole (10) on the side away from the rotor structure (4). The connecting piece (9) passes through the positioning hole (7) and is fixedly connected to the connecting hole (10).

5. The rotor assembly according to claim 4, characterized in that, The positioning hole (7) is a threaded hole, the connecting hole (10) is a blind hole, the connecting piece (9) is a bolt, the bolt is threadedly connected to the positioning hole (7), and the part of the bolt extending into the connecting hole (10) presses against the positioning block (8).

6. The rotor assembly according to claim 5, characterized in that, There are multiple positioning holes (7), and the multiple positioning holes (7) are arranged at intervals along the circumference of the stop ring (5), and each positioning hole (7) is provided with a bolt.

7. The rotor assembly according to claim 2, characterized in that, The number of the positioning grooves (6) is an integer multiple of the number of the stop protrusions. The positioning grooves (6) are at least one set, and the position of each set of positioning grooves (6) matches the position of the stop protrusion.

8. The rotor assembly according to claim 2, characterized in that, There are two stop protrusions, which are located at both ends of the same diameter of the bushing (2) and are symmetrical about the central axis of the rotating shaft (1).

9. The rotor assembly according to claim 1, characterized in that, The bushing (2) is heat-fitted onto the rotating shaft (1).

10. An electric motor, characterized in that, The rotor assembly includes any one of claims 1 to 9.

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