Rotor structure and electric machine

Abstract

The utility model discloses a rotor structure and motor, wherein the rotor structure includes annular main body, first positioning ring and second positioning ring. A plurality of permanent magnets are arranged on the inner circumferential side wall of the annular main body at intervals, and the adjacent two permanent magnets have a positioning gap therebetween. The permanent magnets have first ends and second ends arranged oppositely along the axial direction of the annular main body. The first positioning ring is arranged at the first ends of the permanent magnets, and the first positioning ring is provided with first positioning protrusions. The second positioning ring is arranged at the second ends of the permanent magnets, and the second positioning ring is provided with second positioning protrusions. The rotor structure and the motor solve the problem of complex assembly and low assembly efficiency of the motor caused by the large number of permanent magnet partition plates required by the motor.

Description

Technical Field

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

[0002] Currently, the permanent magnet arrangement in external rotor motors is mainly full-pole arc arrangement to ensure various performance indicators of the motor. However, motors with full-pole arc arrangement have relatively high vibration and noise, and are also expensive. Motors using non-full-pole arc arrangement can effectively reduce motor vibration and noise, and lower motor costs. In motors with non-full-pole arc arrangement, there is a certain gap between the permanent magnets. This is mainly achieved by adding magnetic pole spacers of the same size between adjacent permanent magnets to ensure the uniform distribution of permanent magnets. However, since the number of magnetic pole spacers required is the same as the number of permanent magnets, the large number of magnetic pole spacers required leads to problems such as complex assembly and low assembly efficiency. Utility Model Content

[0003] The main objective of this invention is to provide a rotor structure and motor that can at least solve the problems of complex motor assembly and low assembly efficiency caused by the large number of permanent magnet partitions required for the motor.

[0004] According to one aspect of the present invention, a rotor structure is provided, comprising:

[0005] A ring-shaped body, wherein multiple permanent magnets are spaced apart on the inner peripheral sidewall of the ring-shaped body, and there is a positioning gap between two adjacent permanent magnets. The permanent magnets have a first end and a second end that are arranged opposite to each other along the axial direction of the ring-shaped body.

[0006] A first positioning ring is disposed at the first end of the permanent magnet, and a first positioning protrusion is provided on the first positioning ring.

[0007] The second positioning ring is disposed at the second end of the permanent magnet, and the second positioning ring is provided with a second positioning protrusion.

[0008] Wherein, along the circumference of the annular body, the first positioning protrusion and the second positioning protrusion are alternately embedded in the positioning gap to at least fix the permanent magnet.

[0009] Furthermore, along the circumference of the annular body, at least two adjacent first positioning protrusions are provided with N second positioning protrusions, where N is a natural number.

[0010] Furthermore, along the circumference of the annular body, a second positioning protrusion is provided between two adjacent first positioning protrusions; and / or,

[0011] The number of the first positioning protrusion and the number of the second positioning protrusion are both half the number of the permanent magnets.

[0012] Furthermore, along the axial direction of the annular body, the length L1 of the first positioning protrusion and the length L of the permanent magnet satisfy the relationship: L / 4 ≤ L1 ≤ L; and / or,

[0013] Along the axial direction of the annular body, the length L2 of the second positioning protrusion and the length L of the permanent magnet satisfy the following relationship: L / 4≤L2≤L.

[0014] Furthermore, both the first positioning ring and the second positioning ring are configured as non-magnetic structures.

[0015] Furthermore, the non-magnetic structure includes an aluminum alloy structure, a plastic structure, and a demagnetized stainless steel structure.

[0016] Furthermore, both the first positioning protrusion and the second positioning protrusion are configured as elongated structures, and the cross-section of the elongated structure is circular or polygonal.

[0017] Furthermore, the first positioning ring and the first positioning protrusion are integrally formed or detachably formed; and / or,

[0018] The second positioning ring and the second positioning protrusion are integrally formed or detachably formed.

[0019] Furthermore, an adhesive layer is provided between the permanent magnet and the annular body, and the permanent magnet is bonded to the inner peripheral sidewall of the annular body through the adhesive layer.

[0020] On the other hand, the present invention also provides an electric motor, which includes the rotor structure described above.

[0021] In this invention, by providing a first positioning ring with a first positioning protrusion and a second positioning ring with a second positioning protrusion at both ends of the permanent magnet along its axial direction, and by alternately embedding the first and second positioning protrusions into the positioning gap between the permanent magnets along the circumferential direction of the annular body, the first and second positioning protrusions replace the magnetic pole spacers between the permanent magnets, significantly reducing the number of positioning components, simplifying the assembly process, and significantly improving the motor assembly efficiency. The first and second positioning protrusions also provide stable support and limit to the permanent magnet at both ends of its axial direction, effectively fixing the position of the permanent magnet and preventing it from shifting or falling due to inertia when the rotor rotates, thus ensuring the uniform distribution of the permanent magnets even in a non-full-pole arc arrangement. Attached Figure Description

[0022] The accompanying drawings, which are included to provide a further understanding of the present invention and constitute a part of this invention, illustrate exemplary embodiments of the present invention and, together with the description thereof, serve to explain the present invention and do not constitute an undue limitation thereof. In the drawings:

[0023] Figure 1 This is a three-dimensional structural diagram of the rotor structure disclosed in the embodiment of this utility model;

[0024] Figure 2 This is a partial structural schematic diagram of the rotor structure disclosed in an embodiment of the present utility model;

[0025] Figure 3 This is a schematic diagram of the structure of the first positioning ring and the second positioning ring disclosed in an embodiment of the present utility model;

[0026] Figure 4 This is a partial schematic diagram of the rotor structure disclosed in an embodiment of the present utility model;

[0027] Figure 5 This is a partial structural schematic diagram of the first and second positioning protrusions of the rotor structure disclosed in the embodiment of the present utility model under a first arrangement;

[0028] Figure 6 This is a partial structural schematic diagram of the rotor structure disclosed in the embodiment of the present utility model, showing a second arrangement of the first and second positioning protrusions.

[0029] Figure 7 This is a partial structural schematic diagram of the rotor structure disclosed in the embodiment of the present utility model, showing a third arrangement of the first and second positioning protrusions.

[0030] Figure 8 This is a schematic diagram of the structure of the first positioning ring of the rotor structure disclosed in an embodiment of this utility model.

[0031] The above figures include the following reference numerals:

[0032] 10. Ring-shaped main body; 20. First positioning ring; 21. First positioning protrusion; 30. Second positioning ring; 31. Second positioning protrusion; 40. Permanent magnet; 41. Positioning gap. Detailed Implementation

[0033] 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.

[0034] 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.

[0035] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of this 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 drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0036] In related technologies, permanent magnets in motors with non-full-pole arc arrangement have a certain gap between them. This gap is mainly filled by adding magnetic pole spacers of the same size between adjacent permanent magnets to ensure the uniform distribution of the permanent magnets. However, this requires a large number of magnetic pole spacers, making motor assembly complex and inefficient. Therefore, this application provides a rotor structure and motor that provides a first positioning ring and a second positioning ring at both ends of the permanent magnets along the motor axial direction. The first protrusion on the first positioning ring and the second positioning protrusion on the second positioning ring are alternately embedded in the positioning gap between the permanent magnets, which not only supports the permanent magnets but also reduces the assembly efficiency of the motor.

[0037] See Figures 1 to 8 As shown, according to an embodiment of this application, a rotor structure is provided, including an annular body 10, a first positioning ring 20, and a second positioning ring 30. A plurality of permanent magnets 40 are spaced apart on the inner peripheral sidewall of the annular body 10, with a positioning gap 41 between adjacent permanent magnets 40. Along the axial direction of the annular body 10, each permanent magnet 40 has a first end and a second end that are oppositely disposed. The first positioning ring 20 is disposed at the first end of the permanent magnet 40, and a first positioning protrusion 21 is provided on the first positioning ring 20. The second positioning ring 30 is disposed at the second end of the permanent magnet 40, and a second positioning protrusion 31 is provided on the second positioning ring 30.

[0038] Along the circumference of the annular body 10, the first positioning protrusion 21 and the second positioning protrusion 31 are alternately embedded in the positioning gap 41 to at least fix the permanent magnet 40.

[0039] It is understood that the rotor structure in this embodiment is an external rotor structure. When using the external rotor structure, the external rotor structure is assembled on the outer periphery of the stator. The permanent magnet 40 can generate a rotating magnetic field after the stator winding is energized, which generates electromagnetic torque on the external rotor structure and drives the external rotor structure to rotate relative to the stator.

[0040] It is understood that in this embodiment, the first positioning protrusion 21 and the second positioning protrusion 31 are alternately embedded in the positioning gap 41. This can be represented as the first positioning protrusion 21 and the second positioning protrusion 31 being alternately embedded in the positioning gap 41 according to a predetermined pattern, or it can be represented as the first positioning protrusion 21 and the second positioning protrusion 31 being alternately embedded in the positioning gap 41 without any pattern. Assuming X represents the first positioning protrusion 21 and Y represents the second positioning protrusion, the first positioning protrusion 21 and the second positioning protrusion 31 being alternately embedded in the positioning gap 41 according to a predetermined pattern can be represented as "XYXYXY" or "XYYXYYXYY", etc., and the first positioning protrusion 21 and the second positioning protrusion 31 being alternately embedded in the positioning gap 41 without any pattern can be represented as "XYXYYXX", etc.

[0041] In this embodiment, the annular body 10 is configured as a rotor yoke with an outer rotor structure. Multiple permanent magnets 40 are sequentially and spaced apart on the inner circumferential sidewall of the annular body 10, and are fixedly connected to the annular body 10. A positioning gap 41 exists between any two adjacent permanent magnets 40 fixed on the inner circumferential sidewall of the annular body 10. By placing a first positioning ring 20 at the first end of the permanent magnet 40 and a second positioning ring 30 at the second end of the permanent magnet 40, and alternately embedding the first positioning protrusion 21 of the first positioning ring 20 and the second positioning protrusion 31 of the second positioning ring 30 within the positioning gap 41, the permanent magnets 40 can be supported and fixed. This ensures that the permanent magnets 40 are evenly distributed on the inner circumferential sidewall of the annular body 10, maintaining their position and preventing them from falling off due to inertia during rotor rotation, thus improving the motor's production efficiency. The first positioning ring 20 and the second positioning ring 30 directly assemble the permanent magnet 40 from its first and second ends, improving assembly efficiency during motor production. The first positioning protrusion 21 and the second positioning protrusion 31 not only support and fix the permanent magnet 40 but also separate adjacent permanent magnets 40, preventing displacement of the permanent magnet 40 on the inner circumferential sidewall of the annular body 10 and avoiding interference between adjacent permanent magnets 40, thus improving the reliability of the rotor structure. The first positioning protrusion 21 and the second positioning protrusion 31 are alternately embedded in the positioning gap 41, reducing the number of first positioning protrusions 21 on the first positioning ring 20 and the number of second positioning protrusions 31 on the second positioning ring 30, thereby reducing both the cost and weight of the motor.

[0042] Furthermore, along the circumference of the annular body 10, at least two adjacent first positioning protrusions 21 are provided with N second positioning protrusions 31, where N is a natural number.

[0043] Understandably, at least two adjacent first positioning protrusions 21 are provided with N second positioning protrusions 31, that is, one, two, three or other numbers of second positioning protrusions 31 can be provided between two adjacent first positioning protrusions 21, so that the first positioning ring 20 and the second positioning ring 30 support the permanent magnet 40 from the first end and the second end of the permanent magnet 40, and reduce the number of first positioning protrusions 21 and second positioning protrusions 31, thereby reducing the production cost of the motor while ensuring support for the permanent magnet 40.

[0044] refer to Figure 4 and Figure 5As shown, along the circumference of the annular body 10, a second positioning protrusion 31 is provided between two adjacent first positioning protrusions 21. This means that N in the above embodiment is 1, and the first positioning protrusions 21 and second positioning protrusions 31 are alternately embedded in the positioning gaps 41 between the permanent magnets 40 along the axial direction of the annular body 10. This allows for uniform support and fixation of the permanent magnets 40 from both the first and second ends, improving the support effect and stability of the permanent magnets 40 during motor operation.

[0045] Preferably, the number of first positioning protrusions 21 and the number of second positioning protrusions 31 are both half the number of permanent magnets 40. This allows the first positioning protrusions 21 and the second positioning protrusions 31 to be alternately embedded in the positioning gaps 41 between the permanent magnets 40, optimizing the structure of the first positioning ring 20 and the second positioning ring 30. This allows the first positioning ring 20 and the second positioning ring 30 to be configured with the same structure, meaning they can be produced using the same mold, improving motor production efficiency. Furthermore, since the number of first positioning protrusions 21 and second positioning protrusions 31 is the same, the first positioning ring 20 or the second positioning ring 30 can be assembled without special positioning; assembly is achieved simply by aligning the first positioning protrusion 21 or the second positioning protrusion 31 with the positioning gaps 41, further improving motor assembly efficiency.

[0046] refer to Figure 6 The figure shows the case when N equals 2. In this case, a second positioning ring 30 is set along the circumference of the annular body 10, spaced two first fixing rings 20 apart. The first positioning ring 21 and the second positioning ring 31 fix the permanent magnet 40 from the first end and the second end of the permanent magnet 40. Fixing the permanent magnet 40 from both ends can also ensure the fixing effect of the permanent magnet 40.

[0047] refer to Figure 7 The diagram shows a partial structural schematic of the first positioning protrusion 21 and the second positioning protrusion 31 being irregularly and alternately embedded in the positioning gap 41. The first positioning protrusion 21 and the second positioning protrusion 31 are irregularly and alternately embedded in the positioning gap 41 along the circumference of the annular body 10. Under this structure, the permanent magnet 40 can also be fixed from both ends.

[0048] Preferably, along the axial direction of the annular body 10, the length L1 of the first positioning protrusion 21 and the length L of the permanent magnet 40 satisfy the relationship: L / 4 ≤ L1 ≤ L. Thus, the length L1 of the first positioning protrusion 21 along the axial direction of the annular body 10 is greater than or equal to one-quarter of the length L of the permanent magnet 40. This ensures that the first positioning protrusion 21 can reliably fix the permanent magnet 40 from its first end, preventing the length L1 of the first positioning protrusion 21 from being too small relative to the length L of the permanent magnet 40, thus failing to fix the permanent magnet 40 or providing a poor fixing effect. This ensures that the first positioning protrusion 21 can reliably fix the permanent magnet and reduces the production cost of the first positioning ring 20. If the length L1 of the first positioning protrusion 21 is less than or equal to the length L of the permanent magnet 40, it avoids the situation where the first positioning protrusion 21 extends beyond the permanent magnet 40, thereby affecting the second positioning ring 30 on the other side.

[0049] It should be noted that the length L1 of the first positioning protrusion 21 in this embodiment can be set according to actual conditions. For example, the length L1 of the first positioning protrusion can be set to one-quarter, one-half, or three-quarters of the length L of the permanent magnet 40, or equal to the length L of the permanent magnet 40. Specifically, this application does not limit this.

[0050] Preferably, along the axial direction of the annular body, the length L2 of the second positioning protrusion and the length L of the permanent magnet satisfy the relationship: 1 / 4L ≤ L2 ≤ L. Thus, the length L2 of the second positioning protrusion 31 along the axial direction of the annular body 10 is greater than or equal to one-quarter of the length L of the permanent magnet 40. This ensures that the second positioning protrusion 31 can reliably fix the permanent magnet 40 from its second end, preventing the length L2 of the second positioning protrusion 31 from being too small relative to the length L of the permanent magnet 40, thus failing to fix the permanent magnet 40 or providing a poor fixing effect. This ensures that the second positioning protrusion 31 can reliably fix the permanent magnet and reduces the production cost of the second positioning ring 30. If the length L2 of the second positioning protrusion 31 is less than or equal to the length L of the permanent magnet 40, it avoids the second positioning protrusion 31 extending beyond the permanent magnet 40 and thus affecting the first positioning ring 20 on the other side.

[0051] It should be noted that the length L2 of the second positioning protrusion 31 in this embodiment can be set according to actual conditions. For example, the length L2 of the second positioning protrusion can be set to one-quarter, one-half, or three-quarters of the length L of the permanent magnet 40, or equal to the length L of the permanent magnet 40. Specifically, this application does not limit this.

[0052] Furthermore, both the first positioning ring 20 and the second positioning ring 30 are configured as non-magnetic structures. By configuring both the first positioning ring 20 and the second positioning ring 30 as non-magnetic structures, the influence of the first positioning ring 20 and the second positioning ring 30 on the magnetism of the permanent magnet 40 can be avoided, thus preventing the influence of the magnetic field generated by the motor on the permanent magnet 40 during operation and ensuring stable and reliable motor operation.

[0053] Furthermore, the non-magnetic structure includes aluminum alloy, plastic, and demagnetized stainless steel structures. Thus, both the first positioning ring 20 and the second positioning ring 30 can be configured as one of these three structures: aluminum alloy, plastic, or demagnetized stainless steel. The first positioning ring 20 and the second positioning ring 30 can use the same or different non-magnetic structures. When the first positioning ring 20 and the second positioning ring 30 use the same non-magnetic structure, they can be manufactured together, improving motor production efficiency and reducing motor production costs.

[0054] Understandably, the non-magnetic structure in this embodiment may include a material obtained by demagnetizing a magnetic material, such as the demagnetized stainless steel structure in the above embodiment.

[0055] In this embodiment, when the non-magnetic structure is made of aluminum alloy, the aluminum alloy structure is non-magnetic and lightweight, which can reduce the rotor structure inertia and improve the dynamic response of the motor. It is also easy to process and form, ensuring assembly accuracy. When the non-magnetic structure is made of plastic, the plastic structure not only has non-magnetic properties but also has low cost, light weight, and the effects of shock absorption, noise reduction, and insulation. It can avoid electrochemical corrosion and reduce the cost of the motor. When the non-magnetic structure is made of demagnetized stainless steel, it can provide stable support for the permanent magnet while ensuring that it does not interfere with the motor's magnetic field and can adapt to humid and dusty environments, extending the service life of the motor's rotor structure.

[0056] Furthermore, both the first positioning protrusion 21 and the second positioning protrusion 31 are configured as elongated structures with a circular or polygonal cross-section. This allows the elongated structure to be better fitted into the positioning gap 41. When the cross-section of the elongated structure is circular, it avoids scraping against the permanent magnet 40 when inserted into the positioning gap 41. When the cross-section of the elongated structure is polygonal, such as quadrilateral, it can make better contact with the surface of the permanent magnet 40, providing a better fixation effect.

[0057] Optionally, the first positioning ring 20 and the first positioning protrusion 21 are integrally or detachably configured, and the second positioning ring 30 and the second positioning protrusion 31 are integrally or detachably configured. When the first positioning ring 20 and the first positioning protrusion 21, or the second positioning ring 30 and the second positioning protrusion 31, are integrally configured, the structure has high strength and no assembly gaps, preventing the first positioning protrusion 21 or the second positioning protrusion 31 from loosening during high-speed rotation of the rotor structure, and improving the assembly efficiency of the motor. When the first positioning ring 20 and the first positioning protrusion 21, or the second positioning ring 30 and the second positioning protrusion 31, are detachably configured, it facilitates the replacement of the first positioning protrusion 21 or the second positioning protrusion 31, reducing the maintenance cost of the motor, and allows for flexible adjustment of the position of the first positioning protrusion 21 or the second positioning protrusion 31 to match the gap of the permanent magnet 40.

[0058] Optionally, the integral arrangement between the first positioning ring 20 and the first positioning protrusion 21 or the integral arrangement between the second positioning ring 30 and the second positioning protrusion 31 can be achieved by integral molding, stamping, casting, forging or machining (e.g., milling).

[0059] Furthermore, an adhesive layer (not shown in the figure) is provided between the permanent magnet 40 and the annular body 10, and the permanent magnet 40 is bonded to the inner peripheral sidewall of the annular body 10 through the adhesive layer. In this way, the permanent magnet 40 and the annular body 10 can be tightly bonded together through the adhesive layer, ensuring the stability of the connection and improving the reliability of motor operation.

[0060] On the other hand, this application also discloses an electric motor that includes the aforementioned rotor structure. Therefore, this electric motor incorporates all the technical effects of the aforementioned rotor structure. Since the technical effects of the rotor structure have already been described in detail above, they will not be repeated here.

[0061] 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.

[0062] 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 cannot be construed as limiting the scope of protection of this utility model.

[0063] 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 structure, characterized by, include: A ring-shaped body (10) has a plurality of permanent magnets (40) spaced apart on its inner peripheral sidewall. There is a positioning gap (41) between two adjacent permanent magnets (40). The permanent magnets (40) have a first end and a second end that are arranged opposite to each other along the axial direction of the ring-shaped body (10). A first positioning ring (20) is disposed at the first end of the permanent magnet (40), and a first positioning protrusion (21) is provided on the first positioning ring (20); The second positioning ring (30) is disposed at the second end of the permanent magnet (40), and the second positioning ring (30) is provided with a second positioning protrusion (31); Along the circumference of the annular body (10), the first positioning protrusion (21) and the second positioning protrusion (31) are alternately embedded in the positioning gap (41) to at least fix the permanent magnet (40).

2. The rotor structure according to claim 1, characterized in that, Along the circumference of the annular body (10), N second positioning protrusions (31) are provided between at least two adjacent first positioning protrusions (21), where N is a natural number.

3. The rotor structure according to claim 2, characterized in that, Along the circumference of the annular body (10), a second positioning protrusion (31) is provided between two adjacent first positioning protrusions (21); And / or, the number of the first positioning protrusions (21) and the number of the second positioning protrusions (31) are both half the number of the permanent magnets (40).

4. The rotor structure according to claim 1, characterized in that, Along the axial direction of the annular body (10), the length L1 of the first positioning protrusion (21) and the length L of the permanent magnet (40) satisfy the following relationship: L / 4 ≤ L1 ≤ L; and / or, Along the axial direction of the annular body (10), the length L2 of the second positioning protrusion (31) and the length L of the permanent magnet (40) satisfy the following relationship: L / 4≤L2≤L.

5. The rotor structure according to any one of claims 1 to 4, characterized in that, Both the first positioning ring (20) and the second positioning ring (30) are configured as non-magnetic structures.

6. The rotor structure of claim 5, wherein The non-magnetic structure includes an aluminum alloy structure, a plastic structure, and a demagnetized stainless steel structure.

7. The rotor structure according to any one of claims 1 to 4, characterized in that, Both the first positioning protrusion (21) and the second positioning protrusion (31) are configured as elongated structures, and the cross-section of the elongated structure is circular or polygonal.

8. The rotor structure of any one of claims 1 to 4, wherein, The first positioning ring (20) and the first positioning protrusion (21) are integrally formed or detachably formed; And / or, the second positioning ring (30) and the second positioning protrusion (31) are integrally or detachably configured.

9. The rotor structure of any one of claims 1 to 4, wherein, An adhesive layer is provided between the permanent magnet (40) and the annular body (10), and the permanent magnet (40) is bonded to the inner peripheral sidewall of the annular body (10) through the adhesive layer.

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

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