Motor
The fixing structure of the motor housing uses cold pressing to form transition or gap coordination, which solves the problem of grinding particles during the stator fixation process, reduces energy consumption and cost, and improves positioning accuracy and stability.
Patent Information
- Application Number
- CN202422390560.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-29
- Publication Date
- 2025-07-29
- Estimated Expiration
- 2034-09-29
AI Technical Summary
In the prior art, the fixing method of the stator in the motor housing is prone to generate grinding particles, and the cooling and shrink assembly requires high energy consumption and high cost, making it difficult to ensure positioning accuracy.
The fixing structure using the motor housing is formed integrally by metal materials, including circumferential and axial fixing grooves and positioning shoulders, and a transition or gap fit is formed by cold pressing to avoid interference fit and heating processes.
The stator fixation without abrasive particles is achieved, which reduces assembly energy consumption and cost, and improves the positioning accuracy and stability of the stator in the motor housing.
Smart Images
Figure CN223168127U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the technical field of motors, and more particularly to the fixation of the stator of a motor in a motor housing. Background Art
[0002] It is known from the prior art that a motor typically has a motor housing and a stator, and here it is necessary to fix the stator in the motor housing.
[0003] In the prior art, it is common to fix the stator in the motor housing by the following method, that is, to press the stator into the motor housing, thereby creating an interference fit between the motor housing and the stator. However, disadvantageously, abrasive particles are easily generated during this pressing process, and such abrasive particles will have an adverse effect on the performance of the motor.
[0004] To avoid the generation of abrasive particles, shrink fitting is also proposed in the prior art. To achieve shrink fitting, the motor housing must first be heated to a temperature of, for example, more than 300 °C. However, the heating process consumes a large amount of energy, so the assembly cost is relatively high. Moreover, the investment cost of a shrink fitting station is relatively high because heating coils required for heating the motor housing need to be customized for each different product specification. Not only that, shrink fitting also makes it difficult to ensure the accuracy of the axial positioning and angular positioning of the stator in the motor housing. Summary of the Utility Model
[0005] The object of this application is to provide a motor, which includes: a motor housing made of metal, the motor housing defining an internal space and having an open first end and a second end axially opposed to the first end; and a stator, the stator being installed into the internal space of the motor housing via the first end. Here, the motor housing has a first fixing structure on the side of the stator facing the first end and a second fixing structure on the side of the stator facing the second end, wherein the first fixing structure and the second fixing structure are integrally formed from the material of the motor housing and jointly clamp the stator, thereby preventing the stator from moving in the axial direction, in the radial direction, and rotating in the circumferential direction.
[0006] Optionally, the first fixing structure is a fixing groove extending in the circumferential direction of the motor housing and is formed by rolling the motor housing inward in the radial direction, and the fixing groove prevents the stator from moving axially towards the first end, in the radial direction, and rotating in the circumferential direction. Alternatively, the first fixing structure can also be formed by radially inverting the first end of the motor housing.
[0007] Optionally, the first fixing structure is formed by a continuous fixing groove surrounding the motor housing. Alternatively, the first fixing structure is formed by a plurality of fixing grooves distributed along the circumferential direction of the motor housing.
[0008] Optionally, the second fixing structure is an axial positioning shoulder of the motor housing, and the axial positioning shoulder prevents the stator from moving axially towards the second end. Here, the axial positioning shoulder can be formed by, for example, a diameter reduction portion of the motor housing. Alternatively, the axial positioning shoulder can also be formed by a protrusion on the inner surface of the motor housing.
[0009] Optionally, the second fixing structure is a fixing groove extending along the circumferential direction of the motor housing and is formed by rolling the motor housing radially inward. The fixing groove prevents the stator from moving axially towards the second end, radially, and rotating circumferentially. As described above, the second fixing structure formed by the axial positioning shoulder can only achieve the axial fixation of the stator. The radial and circumferential fixation of the stator in the motor housing is entirely achieved by the first fixing structure. By configuring the second fixing structure as a fixing groove similar to the first fixing structure, the second fixing structure additionally achieves the radial and circumferential fixation of the stator in the motor housing. Thereby, the fixing strength of the stator in the motor housing is increased. Alternatively, the second fixing structure can also be formed by radially inverting the second end of the motor housing.
[0010] Optionally, the second fixing structure is formed by a continuous fixing groove surrounding the motor housing. Alternatively, the second fixing structure is formed by a plurality of fixing grooves distributed along the circumferential direction of the motor housing.
[0011] Optionally, the motor housing further has a third fixing structure axially located between the first fixing structure and the second fixing structure. The third fixing structure is integrally formed from the material of the motor housing and jointly clamps the stator, thereby preventing the stator from moving axially, radially, and / or rotating circumferentially. By additionally providing the third fixing structure between the first fixing structure and the second fixing structure, the fixing reliability of the stator in the motor housing can be further improved.
[0012] Optionally, the third fixing structure includes a fixing groove extending along the circumferential direction of the motor housing and is formed by rolling the motor housing radially inward.
[0013] Optionally, the third fixing structure includes a continuous fixing groove surrounding the motor housing. Additionally or alternatively, the third fixing structure includes a plurality of fixing grooves distributed along the circumferential direction of the motor housing.
[0014] Optionally, the third fixing structure includes a fixing groove extending along the axial direction of the motor housing and formed by rolling the motor housing inward in the radial direction.
[0015] Therefore, an interference fit may not be adopted between the stator and the motor housing, but instead a transition fit or a clearance fit may be adopted. By adopting a transition fit or a clearance fit, the stator can be easily inserted and positioned in the motor housing without generating abrasive particles due to the abrasion between the stator and the motor housing. In addition, it is not necessary to preheat the motor housing to a temperature exceeding, for example, 300 °C, thereby saving the assembly cost of the motor.
[0016] When the first fixing structure, the second fixing structure, or the third fixing structure is a fixing groove, the fixing groove can be formed by deforming the motor housing after the stator is inserted and positioned in the motor housing. For example, a cold press can be used here to deform the motor housing in the radial direction to form the fixing groove. Of course, for the second fixing structure, it can also be formed before the stator is inserted into the motor housing.
[0017] Compared with the cold shrink assembly that requires heating the motor housing, the energy consumption for forming the fixing groove by cold pressing is significantly reduced. Moreover, the cold press can be used for any specification of products without the need for customization for different specifications. In addition, through this fixing method, the stator can be accurately positioned in the motor housing, and the stator can be firmly fixed in the motor housing through mechanical deformation and mechanical clamping. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] The embodiments of the present application will be further described in detail below with reference to the drawings. However, those skilled in the art will understand that these drawings are only for the purpose of explaining the embodiments and should not be construed as limiting the scope of the present application. The drawings show:
[0019] Figure 1 is a very simplified schematic diagram of a motor according to the first embodiment of the present application;
[0020] Figure 2 is a very simplified schematic diagram of a motor according to the second embodiment of the present application;
[0021] Figure 3 is a very simplified schematic diagram of a motor according to the third embodiment of the present application. DETAILED DESCRIPTION OF THE EMBODIMENTS
[0022] Figure 1 Schematically shows an electric machine according to a first embodiment of the present application. As can be seen from Figure 1 it, the electric machine includes an electric machine housing 10 made of metal and a stator 20. The electric machine housing 10 defines an internal space and has an open first end ( Figure 1 the left end in Figure 1 ) and a second end ( Figure 1 the right end in Figure 1 ) axially opposed to the first end. In the illustrated embodiment, the second end is closed. However, the second end may also be open and may be closed by an end cap. Here, the stator 20 can be installed into the internal space of the electric machine housing 10 via the open first end. It should be noted here that the outer dimensions of the stator 20 may be slightly smaller than the inner dimensions of the electric machine housing 10, so as to form an interference fit or a clearance fit between the electric machine housing 10 and the stator 20. Thus, on the one hand, the stator 20 can be easily inserted into the electric machine housing 10, and on the other hand, no grinding will occur between the electric machine housing 10 and the stator 20 or at least no significant grinding will occur between the electric machine housing 10 and the stator 20, thereby avoiding the generation of grinding particles during the assembly process, and such grinding particles will have an adverse effect on the performance of the electric machine. Here, it is also not necessary to preheat the electric machine housing 10 in order to insert the stator 20 into the electric machine housing 10, and such heating will consume a large amount of energy. As also shown in
[0023] In Figure 1In the illustrated embodiment, the first fixing structure 11 is a fixing groove extending in the circumferential direction of the motor housing 10 and is formed by rolling the motor housing 10 inward in the radial direction. The fixing groove can not only prevent the stator 20 from moving axially toward the first end and radially, but also prevent the stator 20 from rotating circumferentially. Here, the first fixing structure 11 may be formed by a continuous fixing groove surrounding the motor housing 10. However, this is not necessary. In an alternative, the first fixing structure 11 may be formed by a plurality of fixing grooves distributed in the circumferential direction of the motor housing 10. By replacing the continuous fixing groove surrounding the motor housing 10 with a plurality of fixing grooves distributed in the circumferential direction of the motor housing 10, on the one hand, the processing amount of the fixing groove can be reduced, and on the other hand, the mechanical strength of the motor housing 10 can be improved.
[0024] In Figure 1 the illustrated embodiment, the second fixing structure 12 is an axial positioning shoulder of the motor housing 10. It can be clearly seen here that the diameter of the motor housing 10 is not uniform, but has a diameter-reducing portion on the right side of the stator 20, and the axial positioning shoulder is formed by the diameter-reducing portion. Such an axial positioning shoulder can prevent the stator 20 from moving axially toward the second end. As an alternative, the axial positioning shoulder may also be formed by a protrusion on the inner surface of the motor housing 10. Since the second fixing structure 12 in the form of an axial positioning shoulder has been provided before the stator 20 is inserted into the motor housing 10, such an axial positioning shoulder can be used as an axial positioning stop when the stator 20 is inserted, thereby simplifying the axial positioning of the stator 20 in the motor housing 10.
[0025] Different from the second fixing structure 12 in the form of an axial positioning shoulder being formed before the stator 20 is inserted into the motor housing 10, the first fixing structure 11 is formed after the stator 20 is inserted into the motor housing 10. For example, a cold press can be used here to deform the motor housing 10 in the radial direction to form the fixing groove. Here, the fixing strength of the stator 20 in the motor housing 10 can be flexibly adjusted by selecting the depth of the fixing groove.
[0026] Figure 2 Schematically shows a motor according to a second embodiment of the present application. From Figure 2 it can be seen that the motor includes a motor housing 10 and a stator 20. Compared with Figure 1Same as the first embodiment shown, the motor housing 10 has a first fixing structure 11 on the side of the stator 20 facing the first end and a second fixing structure 12 on the side of the stator 20 facing the second end. Wherein, the first fixing structure 11 and the second fixing structure 12 are integrally formed from the material of the motor housing 10 and jointly clamp the stator 20, thereby preventing the stator 20 from moving in the axial direction, in the radial direction and rotating in the circumferential direction. In Figure 2 The first fixing structure 11 in the second embodiment shown is the same as the first fixing structure 11 in Figure 1 the first embodiment shown. However, different from Figure 1 the first embodiment shown, in Figure 2 the second embodiment shown, the second fixing structure 12 is not an axial positioning shoulder. Therefore, the motor housing 10 can have a uniform diameter and there is no need to form a protrusion on the inner surface of the motor housing 10, thereby enabling the motor housing 10 to be manufactured more easily. Similar to the first fixing structure 11, the second fixing structure 12 is also a fixing groove extending in the circumferential direction of the motor housing 10 and is formed by rolling the motor housing 10 inward in the radial direction.
[0027] It should be noted here that, similar to the first fixing structure 11, the second fixing structure 12 can be formed by a continuous fixing groove surrounding the motor housing 10. However, as an alternative, the second fixing structure 12 can also be formed by a plurality of fixing grooves distributed in the circumferential direction of the motor housing 10.
[0028] Here, although the second fixing structure 12 can also be formed before the stator 20 is inserted into the motor housing 10, it is advantageous that the second fixing structure 12 is formed after the stator 20 is inserted into the motor housing 10. Thus, the fixing groove can not only prevent the stator 20 from moving in the axial direction towards the second end and in the radial direction, but also prevent the stator 20 from rotating in the circumferential direction. Therefore, the second fixing structure 12 not only undertakes the axial fixing function, but also undertakes the radial fixing and circumferential fixing functions. Thereby, the stator 20 can be fixed more firmly in the motor housing 10.
[0029] Figure 3 Schematically shows a motor according to a third embodiment of the present application. As can be seen from Figure 3 this, the motor includes a motor housing 10 and a stator 20. Different from Figure 2Similar to the second embodiment shown, the motor housing 10 has a first fixing structure 11 on the side of the stator 20 facing the first end and a second fixing structure 12 on the side of the stator 20 facing the second end. Among them, the first fixing structure 11 and the second fixing structure 12 are integrally formed from the material of the motor housing 10 and jointly clamp the stator 20, thereby preventing the stator 20 from moving in the axial direction, in the radial direction, and rotating in the circumferential direction. In Figure 3 In the third embodiment shown, the first fixing structure 11 and the second fixing structure 12 are Figure 2 similar to those in the second embodiment shown and are fixing grooves extending in the circumferential direction of the motor housing 10.
[0030] However, different from Figure 1 the first embodiment shown and Figure 2 the second embodiment shown, in Figure 3 the third embodiment shown, the motor housing 10 further has a third fixing structure 13 located axially between the first fixing structure 11 and the second fixing structure 12. The third fixing structure 13 is integrally formed from the material of the motor housing 10 and jointly clamps the stator 20, thereby preventing the stator 20 from moving in the axial direction, in the radial direction, and / or rotating in the circumferential direction. Thus, as a supplement to the first fixing structure 11 and the second fixing structure 12, the stator 20 can be fixed more firmly in the motor housing 10 by using the third fixing structure 13.
[0031] Here, the third fixing structure 13 may include a fixing groove extending in the circumferential direction of the motor housing 10 and is formed by rolling the motor housing 10 inward in the radial direction. Similar to the first fixing structure 11, the third fixing structure 13 may include a continuous fixing groove surrounding the motor housing 10. As an alternative or supplementary solution, the third fixing structure 13 may also include a plurality of fixing grooves distributed in the circumferential direction of the motor housing 10.
[0032] Although in Figure 3 the embodiment shown, it is shown that the third fixing structure 13 only includes a continuous fixing groove surrounding the motor housing 10, however, a plurality of fixing grooves extending in the circumferential direction may also be arranged side by side axially between the first fixing structure 11 and the second fixing structure 12. Thereby, the fixing strength of the stator 20 in the motor housing 10 can be further improved.
[0033] As an alternative or supplementary solution to the circumferentially extending fixing groove, the third fixing structure 13 may further include at least one fixing groove extending in the axial direction of the motor housing 10 and formed by rolling the motor housing 10 inward in the radial direction. The fixing groove extending in the axial direction of the motor housing 10 can better achieve the circumferential fixation of the stator 20 in the motor housing 10 than the fixing groove extending in the circumferential direction, that is, it can more effectively prevent the stator 20 from rotating in the circumferential direction. Of course, a plurality of fixing grooves extending in the axial direction of the motor housing 10 can also be arranged in a circumferential distribution. The fixing groove extending in the axial direction of the motor housing 10 can extend over the entire axial length of the stator 20 or only over a part of the axial length of the stator 20.
[0034] Of course, the third fixing structure 13 can be used not only in Figure 2 the second embodiment shown, but also in Figure 1 the first embodiment shown to enhance the strength in terms of radial fixation and circumferential fixation.
[0035] The above are only exemplary embodiments of the present application, and the protection scope of the present application is not limited to the above embodiments. Any technical solutions falling within the concept of the present application belong to the protection scope of the present application. It should be noted that for those of ordinary skill in the art, several improvements and refinements made without departing from the principle of the present application should also be regarded as within the protection scope of the present application.
Claims
1. A motor, the motor comprising: A motor housing (10) made of metal, the motor housing (10) defining an internal space and having an open first end and a second end axially opposed to the first end; and A stator (20), the stator (20) being mounted into the internal space of the motor housing (10) via the first end, Characterized in that, The motor housing (10) has a first fixing structure (11) on a side of the stator (20) facing the first end and a second fixing structure (12) on a side of the stator (20) facing the second end, wherein the first fixing structure (11) and the second fixing structure (12) are integrally formed from the material of the motor housing (10) and jointly clamp the stator (20), thereby preventing the stator (20) from moving in the axial direction and in the radial direction and rotating in the circumferential direction.
2. The motor according to claim 1, characterized in that, The first fixing structure (11) is a fixing groove extending in the circumferential direction of the motor housing (10) and is formed by rolling the motor housing (10) inward in the radial direction, and the fixing groove prevents the stator (20) from moving axially towards the first end and in the radial direction and rotating in the circumferential direction; or The first fixing structure (11) is formed by radially inverting the first end of the motor housing (10) inward.
3. The motor according to claim 2, characterized in that, The first fixing structure (11) is formed by a continuous fixing groove surrounding the motor housing (10); or The first fixing structure (11) is formed by a plurality of fixing grooves distributed in the circumferential direction of the motor housing (10).
4. The motor according to claim 1, characterized in that, The second fixing structure (12) is an axial positioning shoulder of the motor housing (10), and the axial positioning shoulder prevents the stator (20) from moving axially towards the second end.
5. The motor according to claim 1, characterized in that, The second fixing structure (12) is a fixing groove extending in the circumferential direction of the motor housing (10) and is formed by rolling the motor housing (10) inward in the radial direction, and the fixing groove prevents the stator (20) from moving axially towards the second end and in the radial direction and rotating in the circumferential direction; or The second fixing structure (12) is formed by radially inverting the second end of the motor housing (10) inward.
6. The motor according to claim 5, characterized in that, The second fixing structure (12) is formed by a continuous fixing groove surrounding the motor housing (10); or The second fixing structure (12) is formed by a plurality of fixing grooves distributed in the circumferential direction of the motor housing (10).
7. The motor according to claim 1, characterized in that, The motor housing (10) further has a third fixing structure (13) axially located between the first fixing structure (11) and the second fixing structure (12). The third fixing structure (13) is integrally formed from the material of the motor housing (10) and jointly clamps the stator (20), thereby preventing the stator (20) from moving in the axial direction and in the radial direction and / or rotating in the circumferential direction.
8. The motor according to claim 7, wherein the third fixing structure (13) includes a fixing groove extending in the circumferential direction of the motor housing (10) and is formed by rolling the motor housing (10) inward in the radial direction.
9. The motor according to claim 8, wherein the third fixing structure (13) includes a continuous fixing groove surrounding the motor housing (10); and / or the third fixing structure (13) includes a plurality of fixing grooves distributed in the circumferential direction of the motor housing (10).
10. The motor according to claim 7, wherein the third fixing structure (13) includes a fixing groove extending in the axial direction of the motor housing (10) and is formed by rolling the motor housing (10) inward in the radial direction.