Rotor assembly and motor

Abstract

The utility model relates to the technical field of rotor assembly structures, in particular to a rotor assembly and a motor, the rotor assembly comprises a rotating shaft sleeved with a magnetic ring, large-gap assembly is formed between the magnetic ring and the rotating shaft, and on the premise of not using extra positioning assistive devices, a positioning piece is arranged on the outer wall of the rotating shaft, so that the positioning piece is fixed on the outer wall of the rotating shaft. The positioning parts are uniformly distributed on the rotating shaft at the two ends of the sleeving part, and the gap between the outer surface of each positioning part and the inner wall of the magnetic ring is controlled within 0.05 mm. The relative position of the magnetic ring and the rotating shaft is positioned through the positioning parts, so that the rotor assembly can be directly assembled, and the positioning parts are simple in material source, relatively low in cost, obvious in effect and convenient to popularize and apply.

Description

Technical Field

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

[0002] Ring magnets are widely used as rotor magnets in various motors due to their simple assembly. The shaft, as a means of power output for the motor, often requires the magnetic ring to be connected to the shaft using glue, resulting in a gap between the magnetic ring and the shaft. However, because the coefficients of thermal expansion of the magnetic ring and the shaft are different, a large gap is required to prevent the magnetic ring from cracking at high temperatures. This large gap can lead to misalignment between the magnetic ring and the shaft. Therefore, to ensure the runout of the rotor assembly, additional positioning fixtures are needed to fix the relative position of the magnetic ring and the shaft during assembly.

[0003] When assembling with positioning fixtures, the cumulative clearance between the fixtures, magnetic rings, and shafts directly affects the runout of the rotor assembly. Therefore, the positioning fixtures require very high machining precision to meet the runout requirements of high-precision rotor assemblies. Furthermore, assembling large batches of rotor assemblies with positioning fixtures places a high demand on the number of fixtures required, increasing the assembly cost. Utility Model Content

[0004] The purpose of this utility model is to address the problem that existing technologies require additional positioning fixtures to position the magnetic ring and the shaft when assembling them with a large gap. These fixtures have high precision requirements and are costly. This invention provides a rotor assembly and motor. The rotor assembly provided in this application, without using additional positioning fixtures, has a positioning element on the outer wall of the shaft. The thickness of the positioning element is less than the gap between the magnetic ring and the shaft. The positioning element positions the magnetic ring and the shaft, allowing for direct assembly of the rotor assembly. Furthermore, the positioning element is made of readily available and low-cost materials, has a significant effect, and is easy to promote and apply.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0006] A rotor assembly includes a rotating shaft with a magnetic ring sleeved on its outer side. The magnetic ring covers an area that forms a sleeve portion. Positioning elements are provided on the rotating shaft at both ends of the sleeve portion. The gap between the outer surface of the positioning element and the inner wall of the magnetic ring is no greater than 0.05 mm.

[0007] The rotor assembly provided by this utility model includes a rotating shaft with a magnetic ring sleeved on it. A large gap is formed between the magnetic ring and the rotating shaft for assembly. Without using additional positioning aids, positioning components are provided on the outer wall of the rotating shaft, so that positioning components are distributed on the rotating shaft at both ends of the sleeve. The gap between the outer surface of the positioning component and the inner wall of the magnetic ring is controlled within 0.05mm. The relative position of the magnetic ring and the rotating shaft is positioned by the positioning components, so that the rotor assembly can be directly assembled. Moreover, the positioning component material is simple to obtain, low in cost, and has obvious effect, making it easy to promote and apply.

[0008] Furthermore, there is a gap of more than 0.1 mm between the inner wall of the magnetic ring and the outer wall of the rotating shaft. Because the magnetic ring and the rotating shaft have different coefficients of thermal expansion, a large gap is required between the magnetic ring and the rotating shaft to prevent the magnetic ring from cracking due to the shaft's expansion at high temperatures.

[0009] Furthermore, the gap between the outer surface of the positioning element and the inner wall of the magnetic ring is 0.01 mm to 0.05 mm. This gap, within a suitable range, ensures the proper running-out effect between the rotors. Preferably, the gap between the outer surface of the positioning element and the inner wall of the magnetic ring is 0.02 mm to 0.03 mm.

[0010] Furthermore, the positioning element is a metal structural component or adhesive tape. Furthermore, the positioning element is a component made of a material resistant to temperatures above 80°C. Preferably, the positioning element is an iron alloy sheet, a copper alloy sheet, or adhesive tape.

[0011] Furthermore, the positioning element is circumferentially wound around the rotating shafts at both ends of the sleeve portion, or the positioning element is spirally wound around the rotating shafts.

[0012] Furthermore, it also includes a bushing, which covers the outer wall of the rotating shaft, and the positioning element is fixed to the outer wall of the bushing.

[0013] Another objective of this invention is to provide an application product motor for the aforementioned rotor assembly.

[0014] An electric motor comprising the rotor assembly described above.

[0015] The motor provided by this utility model adopts the rotor assembly provided in this application, which eliminates the need for additional positioning fixtures, significantly reduces costs, and has a better performance, making it easy to promote and apply.

[0016] In summary, due to the adoption of the above technical solution, the beneficial effects of this utility model are:

[0017] 1. The rotor assembly provided by this utility model includes a rotating shaft with a magnetic ring sleeved on it. The magnetic ring and the rotating shaft are assembled with a large gap. Without using additional positioning aids, positioning parts are provided on the outer wall of the rotating shaft, so that positioning parts are distributed on the rotating shaft at both ends of the sleeved part. The gap between the outer surface of the positioning part and the inner wall of the magnetic ring is controlled within 0.05mm. The relative position of the magnetic ring and the rotating shaft is positioned by the positioning parts, so that the rotor assembly can be directly assembled. Moreover, the positioning parts are made of simple materials, have low cost, obvious effect, and are easy to promote and apply.

[0018] 2. The motor provided by this utility model adopts the rotor assembly provided in this application, which eliminates the need for additional positioning fixtures, significantly reduces costs, and has a better performance, making it easy to promote and apply. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the external structure of a rotor assembly in the prior art.

[0020] Figure 2 for Figure 1 A side view structural diagram.

[0021] Figure 3 This is a schematic diagram of the internal structure of the rotor assembly provided in Example 1.

[0022] Figure 4 This is a schematic diagram of the internal structure of another rotor assembly provided in Embodiment 1.

[0023] Figure 5 This is a schematic diagram of the internal structure of the rotor assembly provided in Example 2.

[0024] Figure 6 This is a schematic diagram of the internal structure of the rotor assembly provided in Example 3.

[0025] Figure 7 This is a schematic diagram of the internal structure of the rotor assembly provided in Example 4.

[0026] Icons: 1-Magnetic ring; 2-Shaft; 21-Sleeve; 3-Positioning component. Detailed Implementation

[0027] The present invention will now be described in detail with reference to the accompanying drawings.

[0028] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only for explaining this utility model and are not intended to limit this utility model.

[0029] Example 1

[0030] like Figure 1and Figure 2 As shown, a rotor assembly includes a magnetic ring 1 and a rotating shaft 2. The rotating shaft 2 has a central section with the largest diameter shaft, and two shafts with decreasing diameters are arranged at each end. The three shafts are concentric and coaxial to form the rotating shaft 2. The magnetic ring 1 is a hollow cylindrical structure. The magnetic ring 1 is fitted onto the outside of the rotating shaft 2, that is, fitted onto the central section of the rotating shaft 2 with the largest diameter. The area covered by the magnetic ring 1 forms a fitting portion. There is a large gap of 0.2 mm between the inner wall of the magnetic ring 1 and the outer wall of the rotating shaft 2 within the fitting portion. This large gap assembly will cause the magnetic ring 1 and the rotating shaft 2 to be misaligned. When the magnetic ring 1 and the rotating shaft 2 are not concentric, the good runout of the entire rotor assembly cannot be guaranteed. Existing technology usually uses additional positioning aids to fix the relative position of the magnetic ring 1 and the rotating shaft 2 during assembly. When assembling with positioning fixtures, the positioning fixtures, magnetic ring 1, and rotating shaft 2 all have clearance fits. The accumulation of clearances directly affects the runout of the rotor assembly. Therefore, the machining accuracy of the positioning fixtures is very high to meet the runout requirements of high-precision rotor assemblies. In addition, when assembling large batches of rotor assemblies with positioning fixtures, a high number of positioning fixtures is required, which increases the assembly cost of rotor assemblies.

[0031] like Figure 3 As shown, the rotor assembly provided in this embodiment does not have additional positioning accessories. Instead, positioning elements 3 are provided on the outer wall of the rotating shaft 2. It is required that positioning elements 3 are distributed on both ends of the rotating shaft 2 of the sleeve portion; positioning elements 3 cannot only be present in the middle of the rotating shaft 2, otherwise the relative position of the magnetic ring 1 and the rotating shaft 2 cannot be fixed. Simultaneously, the gap between the outer surface of the positioning element 3 and the inner wall of the magnetic ring 1 is 0.02 mm. Specifically, Figure 3 The two ends of the sleeve are wrapped with tape in a circumferential direction. This tape is a high-temperature resistant tape that can withstand high temperatures of 80-350℃.

[0032] The rotor assembly provided in this embodiment can be directly assembled, and the positioning parts are made of simple materials with low cost and obvious effect, making it easy to promote and apply.

[0033] like Figure 4 As shown, this embodiment 1 provides another rotor assembly form, in Figure 3 Based on the rotor assembly, a bushing 21 is added, which covers the outer wall of the rotating shaft 2, and the positioning member 3 is fixed to the outer wall of the bushing 21.

[0034] Example 2

[0035] like Figure 5As shown, Embodiment 2 provides a rotor assembly including a magnetic ring 1 and a rotating shaft 2. The magnetic ring 1 is sleeved on the outside of the rotating shaft 2, specifically on the central shaft body of the rotating shaft 2 with the largest diameter. The area covered by the magnetic ring 1 forms a sleeve portion. A large gap of 0.3 mm exists between the inner wall of the magnetic ring 1 and the outer wall of the rotating shaft 2 within the sleeve portion. Positioning elements 3 are provided on the outer wall of the rotating shaft 2. It is required that positioning elements 3 are distributed on both ends of the rotating shaft 2 at the sleeve portion; positioning elements 3 cannot only be present in the middle of the rotating shaft 2, otherwise the relative position of the magnetic ring 1 and the rotating shaft 2 cannot be fixed. Simultaneously, the gap between the outer surface of the positioning element 3 and the inner wall of the magnetic ring 1 is 0.03 mm. Specifically, Figure 5 The tape is spirally wound around the sleeve section, and the tape extends to both ends of the sleeve section. This tape is a high-temperature resistant tape that can withstand temperatures of 120-350℃.

[0036] The rotor assembly provided in this embodiment can be directly assembled, and the positioning parts are made of simple materials with low cost and obvious effect, making it easy to promote and apply.

[0037] Example 3

[0038] like Figure 6 As shown, Embodiment 3 provides a rotor assembly including a magnetic ring 1 and a rotating shaft 2. The magnetic ring 1 is sleeved on the outside of the rotating shaft 2, that is, it is sleeved on the middle shaft body of the rotating shaft 2 with the largest diameter. The area covered by the magnetic ring 1 forms a sleeve portion. There is a large gap of 0.3 mm between the inner wall of the magnetic ring 1 and the outer wall of the rotating shaft 2 within the sleeve portion. A positioning element 3 is provided on the outer wall of the rotating shaft 2. It is required that the positioning element 3 is distributed on both ends of the rotating shaft 2 of the sleeve portion, and that the positioning element 3 is not only present in the middle of the rotating shaft 2, otherwise the relative position of the magnetic ring 1 and the rotating shaft 2 cannot be fixed. At the same time, the gap between the outer surface of the positioning element 3 and the inner wall of the magnetic ring 1 is 0.05 mm. Specifically, Figure 6 A copper alloy sheet is bonded along the length of the sleeve portion, and the copper alloy sheet extends to both ends of the sleeve portion.

[0039] The rotor assembly provided in this embodiment can be directly assembled, and the positioning parts are made of simple materials with low cost and obvious effect, making it easy to promote and apply.

[0040] Example 4

[0041] like Figure 7As shown, Embodiment 4 provides a rotor assembly including a magnetic ring 1 and a rotating shaft 2. The magnetic ring 1 is sleeved on the outside of the rotating shaft 2, that is, it is sleeved on the middle shaft body of the rotating shaft 2 with the largest diameter. The area covered by the magnetic ring 1 forms a sleeve portion. There is a large gap of 0.25mm between the inner wall of the magnetic ring 1 and the outer wall of the rotating shaft 2 within the sleeve portion. A positioning element 3 is provided on the outer wall of the rotating shaft 2. It is required that the positioning element 3 is distributed on both ends of the rotating shaft 2 of the sleeve portion, and not only in the middle of the rotating shaft 2, otherwise the relative position of the magnetic ring 1 and the rotating shaft 2 cannot be fixed. At the same time, the gap between the outer surface of the positioning element 3 and the inner wall of the magnetic ring 1 is 0.01mm. Specifically, Figure 7 It consists of thin iron alloy sheets scattered throughout the sleeve section, with the iron alloy sheets covering both ends of the sleeve section.

[0042] The rotor assembly provided in this embodiment can be directly assembled, and the positioning parts are made of simple materials with low cost and obvious effect, making it easy to promote and apply.

[0043] The motor provided in this embodiment uses any one of the rotor components in embodiments 1-4, which does not require additional positioning fixtures, significantly reduces costs, and has good performance, making it easy to promote and apply.

[0044] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A rotor assembly, comprising a rotating shaft with a magnetic ring sleeved on the outside, wherein the area covered by the magnetic ring forms a sleeve portion, characterized in that: Positioning pieces are arranged on the rotating shafts at both ends of the sleeve portion, and the gap between the outer surface of the positioning piece and the inner wall of the magnetic ring is no more than 0.05 mm.

2. The rotor assembly according to claim 1, characterized in that The gap between the outer surface of the positioning member and the inner wall of the magnetic ring is 0.01 mm to 0.05 mm.

3. The rotor assembly according to claim 2, characterized in that: The gap between the outer surface of the positioning member and the inner wall of the magnetic ring is 0.02 mm to 0.03 mm.

4. The rotor assembly according to claim 1, characterized in that: The positioning member is made of a material that can withstand high temperatures above 80°C.

5. The rotor assembly according to claim 1, characterized in that: The positioning piece is a metal structural piece or an adhesive tape.

6. The rotor assembly according to claim 5, characterized in that The positioning piece is an iron alloy sheet, a copper alloy sheet or an adhesive tape.

7. The rotor assembly according to claim 1, characterized in that The positioning member is circumferentially wound on the rotating shafts at both ends of the sleeve portion or the positioning member is spirally wound on the rotating shaft.

8. The rotor assembly according to any one of claims 1 to 7, characterized in that: It also includes a shaft sleeve, which is covered on the outer wall of the rotating shaft, and the positioning member is fixed on the outer wall of the shaft sleeve.

9. A motor, characterized in that: Comprising a rotor assembly as described in any one of claims 1-8.

Images