An insulating end cover structure for motors

Abstract

This utility model relates to an insulating end cap structure for a motor, comprising an end cap body, an insulating bearing seat, and a motor bearing coaxially arranged; the end cap body has an internal mounting cavity that matches the shape of the insulating bearing seat, the insulating bearing seat is fixed in the mounting cavity, and the motor bearing is mounted in the insulating bearing seat; the insulating bearing seat has a limiting groove along the circumferential direction on the side near the end cap body, and the mounting cavity has a limiting protrusion that matches the limiting groove. Compared with the prior art, this utility model has the advantages of simple structure, high reliability, and low cost.

Description

Technical Field

[0001] This utility model relates to the field of new energy electric drive devices, and in particular to a motor insulation end cap structure. Background Technology

[0002] Permanent magnet synchronous motors (PMSMs) are characterized by high torque density, high efficiency, and high reliability, and are widely used in drive systems for new energy electric vehicles. However, due to factors such as motor flux asymmetry, static electricity accumulation, and shaft current caused by controller common-mode voltage, bearings may experience electrical breakdown and erosion. Moreover, the higher the motor's power, the greater the risk of bearing overcurrent.

[0003] Electro-corrosion is a common problem in motor bearings, causing abnormal noise. Current technology typically addresses this issue with a "blocking and unblocking" approach, using a front-end carbon brush / conductive ring in conjunction with a rear-end ceramic ball bearing. However, this approach has the following drawbacks:

[0004] 1. The back-end uses a ceramic ball bearing solution, which is very expensive and not suitable for mass production.

[0005] 2. In addition, resin bushing bearings have emerged in the market as a replacement for ceramic ball bearings to reduce costs. However, this solution has not been verified by large-scale products and there are potential risks.

[0006] In summary, existing insulation structures for preventing motor bearing corrosion suffer from high costs, limiting mass production, or low structural reliability, posing safety hazards. Therefore, there is a need for a motor insulation end cap structure that is simple in structure, highly reliable, and low in cost. Utility Model Content

[0007] The purpose of this utility model is to overcome the shortcomings of the existing technology, such as high cost and inconvenience for mass use and promotion, and to provide a motor insulation end cover structure that is simple, reliable and low cost.

[0008] The objective of this utility model can be achieved through the following technical solutions:

[0009] An insulating end cap structure for an electric motor includes an end cap body, an insulating bearing housing, and an electric motor bearing arranged coaxially.

[0010] The end cap body has an internal mounting cavity that matches the shape of the insulating bearing seat. The insulating bearing seat is fixed in the mounting cavity, and the motor bearing is installed in the insulating bearing seat.

[0011] The insulating bearing housing has a limiting groove along the circumferential direction on the side near the end cover body, and the mounting cavity has a limiting protrusion that cooperates with the limiting groove.

[0012] Preferably, the insulating bearing housing is further provided with a limiting flat opening on the side near the end cover body, and the width of the limiting flat opening is smaller than the outer diameter of the insulating bearing housing.

[0013] Preferably, there are multiple limiting flat openings, and each limiting flat opening is evenly and symmetrically distributed around the circumference of the insulating bearing seat.

[0014] Preferably, the limiting flat opening and the insulating bearing seat are an integral structure.

[0015] Preferably, the insulating bearing housing includes a mounting ring and a limiting ring, the limiting ring being fixed to one end of the mounting ring, and the inner diameter of the limiting ring being smaller than the inner diameter of the mounting ring.

[0016] Preferably, the mounting ring and the limiting ring are an integral structure.

[0017] Preferably, the shape of the motor bearing matches the inner cavity of the mounting ring, the motor bearing is located inside the mounting ring, and one end of the motor bearing abuts against one side of the limiting ring.

[0018] Preferably, the outer ring of the motor bearing is clearance-fitted with the mounting ring, and the outer diameter of the motor bearing is smaller than the inner diameter of the mounting ring but larger than the inner diameter of the limiting ring.

[0019] Preferably, the insulating bearing housing is made of ceramic material.

[0020] Preferably, the end cap body and the insulating bearing seat are assembled by casting.

[0021] Compared with the prior art, the present invention has the following advantages:

[0022] (1) This solution involves installing an insulated bearing housing within the motor end cover body, thereby blocking the voltage transmission path between the end cover body and the motor bearing and effectively suppressing electro-corrosion. A limiting groove is provided on the outer ring of the insulated bearing housing, which cooperates with the limiting protrusion inside the end cover body to axially limit the insulated bearing housing. Combined with the limiting flat opening structure, this effectively ensures a tight fit between the bearing housing and the end cover body, preventing slippage and deformation, and guaranteeing installation stability and structural reliability.

[0023] (2) This solution replaces the ceramic ball bearing with a bearing housing, which simplifies the overall structure and makes installation convenient. It effectively reduces costs, has obvious advantages, a reliable structure, is suitable for mass production, and facilitates product promotion. Attached Figure Description

[0024] Figure 1 A schematic diagram of the structure of the motor end cover provided by this utility model;

[0025] Figure 2 A schematic diagram of the structure of the insulating bearing housing provided by this utility model;

[0026] In the figure: 1. End cap body, 2. Insulating bearing seat, 3. Motor bearing, 21. Limiting groove, 22. Limiting flat opening, 23. Mounting ring, 24. Limiting ring. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0028] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0029] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0030] In the description of this utility model, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the utility model product is in use. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0031] It should be noted that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0032] Furthermore, terms such as "horizontal" and "vertical" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," not that the structure must be completely horizontal, but can be slightly tilted.

[0033] Example 1

[0034] like Figure 1 and Figure 2 As shown, this embodiment provides a motor insulating end cover structure, including an end cover body 1, an insulating bearing seat 2, and a motor bearing 3 arranged coaxially;

[0035] The end cap body 1 has an internal mounting cavity that matches the shape of the insulating bearing seat 2. The insulating bearing seat 2 is fixed in the mounting cavity, and the motor bearing 3 is installed in the insulating bearing seat 2. The insulating bearing seat 2 has a limiting groove 21 along the circumferential direction on the side near the end cap body 1, and the mounting cavity has a limiting protrusion that matches the limiting groove 21.

[0036] In this embodiment, an insulating bearing housing is provided inside the motor end cover body, and the motor bearing is installed inside the bearing housing, which blocks the voltage transmission path between the end cover body and the motor bearing, and can effectively suppress the occurrence of electro-corrosion.

[0037] Furthermore, the insulating bearing housing 2 is provided with a limiting flat opening 22 on the side near the end cover body 1, and the width of the limiting flat opening 22 is smaller than the outer diameter of the insulating bearing housing 2.

[0038] Optionally, there may be multiple limiting flat openings 22, which are evenly and symmetrically distributed around the perimeter of the insulating bearing housing 2. The limiting flat openings 22 and the insulating bearing housing 2 are an integral structure.

[0039] In this embodiment, a limiting groove is provided on the outer ring of the insulating bearing housing, which cooperates with the limiting protrusion inside the end cover body to limit the axial movement of the insulating bearing housing. With the limiting flat opening structure, it can effectively ensure that the bearing housing and the end cover body are tightly connected and will not slip or deform, thus ensuring the stability of installation and the reliability of the structure.

[0040] In this embodiment, as Figure 2 As shown, the insulating bearing housing 2 includes a mounting ring 23 and a limiting ring 24. The limiting ring 24 is fixed to one end of the mounting ring 23, and the inner diameter of the limiting ring 24 is smaller than the inner diameter of the mounting ring 23.

[0041] The mounting ring 23 and the limiting ring 24 are integral structures. The shape of the motor bearing 3 matches the inner cavity of the mounting ring 23, and the motor bearing 3 is located inside the mounting ring 23. One end of the motor bearing 3 abuts against one side of the limiting ring 24. The outer ring of the motor bearing 3 has a clearance fit with the mounting ring 23. The outer diameter of the motor bearing 3 is smaller than the inner diameter of the mounting ring 23, but larger than the inner diameter of the limiting ring 24.

[0042] The insulating bearing housing 2 has a limiting groove at one end of the limiting ring 24, which is installed inside the end cover body 1. The motor bearing 3 is installed inside the mounting ring 23, with one end of the outer ring abutting against one side of the limiting ring 23, thus installing the motor bearing 3. Other bearing fixing structures outside the end cover body 1 are existing technology and will not be described in detail in this embodiment.

[0043] In this embodiment, the insulating bearing housing 2 is made of ceramic material. The ceramic material of the bearing housing can ensure the insulation of the bearing housing and effectively block the voltage transmission path between the end cover body and the motor bearing.

[0044] In this embodiment, the end cap body 1 and the insulating bearing seat 2 are assembled by casting.

[0045] In conjunction with the above preferred embodiments, such as Figure 1 , Figure 2 As shown, this embodiment provides a more specific motor insulation end cover structure, including an end cover body 1, an insulation bearing seat 2, and a motor bearing 3 structure;

[0046] The end cap body 1 is made of aluminum alloy, and the insulating bearing seat 2 is made of ceramic material, which can play an insulating role. The insulating bearing seat 2 has a limiting groove 21 and a limiting flat opening 22 machined in the circumferential direction. It can be understood that the shape of the limiting groove 21 and the limiting flat opening 22 can be adapted to achieve the limiting function of the insulating bearing seat 2.

[0047] In addition, the end cover body 1 and the insulating bearing housing 2 are assembled together by casting or assembly; the motor bearing 3 is installed inside the insulating bearing housing 2, and the outer ring of the motor bearing 3 and the insulating bearing housing 2 are fitted with a clearance to facilitate the assembly and disassembly of the motor bearing; the insulating bearing housing 2 can effectively isolate the voltage and current transmission between the motor bearing 3 and the end cover body 1, thereby effectively suppressing the occurrence of electro-corrosion. Moreover, by replacing the ceramic ball bearing with the bearing housing, there is a significant cost advantage, the structure is reliable, and it is suitable for mass production and promotion.

[0048] The preferred embodiments of this utility model have been described in detail above. It should be understood that those skilled in the art can make numerous modifications and variations based on the concept of this utility model without creative effort. Therefore, all technical solutions that can be obtained by those skilled in the art based on the concept of this utility model through logical analysis, reasoning, or limited experimentation on the basis of existing technology should be within the scope of protection defined by the claims.

Claims

1. A motor insulation end cap structure, characterized in that, It includes a coaxially arranged end cap body (1), an insulating bearing seat (2), and a motor bearing (3); The end cap body (1) has an installation cavity inside that matches the shape of the insulating bearing seat (2). The insulating bearing seat (2) is fixed in the installation cavity, and the motor bearing (3) is installed in the insulating bearing seat (2). The insulating bearing seat (2) has a limiting groove (21) along the circumferential direction on the side near the end cover body (1), and the mounting cavity has a limiting protrusion that cooperates with the limiting groove (21).

2. The motor insulation end cover structure according to claim 1, characterized in that, The insulating bearing seat (2) is also provided with a limiting flat opening (22) on the side near the end cover body (1), and the width of the limiting flat opening (22) is smaller than the outer diameter of the insulating bearing seat (2).

3. The motor insulation end cover structure according to claim 2, characterized in that, The number of limiting flat openings (22) is multiple, and each limiting flat opening (22) is evenly and symmetrically distributed around the insulating bearing seat (2).

4. The motor insulation end cover structure according to claim 2, characterized in that, The limiting flat opening (22) and the insulating bearing seat (2) are an integral structure.

5. The motor insulation end cover structure according to claim 1, characterized in that, The insulating bearing housing (2) includes a mounting ring (23) and a limiting ring (24). The limiting ring (24) is fixed to one end of the mounting ring (23), and the inner diameter of the limiting ring (24) is smaller than the inner diameter of the mounting ring (23).

6. The motor insulation end cover structure according to claim 5, characterized in that, The mounting ring (23) and the limiting ring (24) are an integral structure.

7. The motor insulation end cover structure according to claim 5, characterized in that, The shape of the motor bearing (3) matches the inner cavity of the mounting ring (23). The motor bearing (3) is located inside the mounting ring (23), and one end of the motor bearing (3) abuts against one side of the limiting ring (24).

8. The motor insulation end cover structure according to claim 7, characterized in that, The outer ring of the motor bearing (3) is clearance-fitted with the mounting ring (23). The outer diameter of the motor bearing (3) is smaller than the inner diameter of the mounting ring (23) and larger than the inner diameter of the limiting ring (24).

9. The motor insulation end cover structure according to claim 1, characterized in that, The insulating bearing housing (2) is made of ceramic material.

10. The motor insulation end cover structure according to claim 1, characterized in that, The end cap body (1) and the insulating bearing seat (2) are assembled by casting.

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