A stress groove structure, motor stator, motor and compressor

Abstract

The utility model provides a kind of stress groove structure, motor stator, motor and compressor, it is related to compressor technical field, solve the technical problem that the stator outer circle and compressor shell interference fit in prior art make that stator core stress increases and leads to core iron loss increase, influence compressor performance.The stress groove structure is arranged on stator lamination, the stress groove structure includes left groove wall, right groove wall and groove bottom, the both ends of the groove bottom are connected between the left groove wall bottom end and the right groove wall bottom end, the left groove wall and the right groove wall are N layer dentiform groove structure, 2 < N < 5.The utility model is used to provide a kind of stress groove structure, motor stator, motor and compressor for improving compressor performance and reducing noise.

Description

Technical Field

[0001] This utility model relates to the field of compressor technology, and in particular to a stress groove structure, a motor stator, a motor, and a compressor. Background Technology

[0002] Currently, the fixing of the motor stator of an air conditioner compressor to the compressor housing is mostly achieved through an interference fit between the outer diameter of the stator and the inner diameter of the compressor housing. The implementation process involves high-frequency induction heating of the compressor housing, causing the inner diameter of the housing to expand due to the heat. The motor stator is then quickly placed inside the housing, with tooling ensuring proper positioning. The housing is then rapidly cooled, causing its inner diameter to shrink, thus creating an interference fit between the inner diameter of the housing and the outer diameter of the stator.

[0003] An interference fit increases the stress on the stator core, leading to increased iron loss and reduced compressor performance. Furthermore, the interference fit causes deformation of the stator core. Under the influence of the interference force, the inner diameter of the stator core becomes smaller radially and deforms, further affecting the uniformity and coaxiality of the air gap between the motor stator and rotor, resulting in reduced compressor performance and increased noise.

[0004] To address the aforementioned problems, the prior art provides a dovetail groove structure, such as... Figures 1-2 As shown, by cutting a dovetail-shaped single-layer groove on the outer circle of the stator, its main function is to serve as a cooling channel. The dovetail-shaped groove notch can also improve the increased stress and inner diameter deformation of the stator core caused by interference fit to a certain extent, but the improvement effect is very limited. Utility Model Content

[0005] The purpose of this utility model is to provide a stress groove structure, a motor stator, a motor, and a compressor to solve the technical problem in the prior art where the interference fit between the stator outer circle and the compressor housing increases the stress on the stator core, leading to increased iron loss in the core and affecting the compressor performance. The various technical effects of the preferred solutions among the many technical solutions provided by this utility model are detailed below.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] The stress groove structure provided by this utility model is set on the stator lamination. The stress groove structure includes a left groove wall, a right groove wall and a groove bottom. The two ends of the groove bottom are connected between the bottom ends of the left groove wall and the bottom ends of the right groove wall. The left groove wall and the right groove wall are N-layer toothed groove structures, where 2 < N < 5.

[0008] As an optional implementation, the width dimension between the bottom of each tooth of the N-layer toothed groove structure between the left groove wall and the right groove wall increases sequentially from the outside to the inside along the radial direction of the stator lamination.

[0009] As an optional implementation, the included angle between the left groove wall and the right groove wall is an acute angle.

[0010] As an alternative implementation, the stress groove structure is arranged symmetrically along the radial direction of the stator lamination.

[0011] As an alternative implementation, the middle portion of the groove bottom extends toward the center of the stator lamination.

[0012] As an optional implementation, the bottom of the trough has a V-shaped structure, and the included angle of the bottom of the V-shaped structure is A, where 100°≤A≤160°.

[0013] As an optional implementation, the groove bottom includes a plurality of toothed recesses connected in sequence, and the toothed recess located in the middle of the groove bottom is closest to the center of the stator lamination.

[0014] An electric motor stator includes a plurality of stator laminations, wherein the stator laminations are provided with stress groove structures as described above.

[0015] As an optional implementation, the stator lamination is further provided with a stator slot, the minimum yoke thickness between the bottom of the stator slot and the outside of the stator lamination is H1, and the minimum distance between the stator slot and the stress groove structure is H2, 0.8*H1≤H2≤1.3*H1.

[0016] As an optional implementation, the stress groove structure is provided with M groups, where 3≤M≤18.

[0017] An electric motor includes a motor rotor, a motor housing, and a motor stator as described above.

[0018] A compressor comprising the motor described above.

[0019] The beneficial effects of this utility model are as follows: The stress groove structure, motor stator, motor, and compressor provided by this utility model are arranged on the stator laminations and symmetrically along the radial direction of the stator laminations. The stress groove structure is used to disperse and buffer the force generated by the thermal interference fit between the compressor housing and the outer circle of the stator core, which can reduce the internal stress generated in the stator core. The reduction of stress can reduce the core loss inside the stator core, thereby reducing the total loss of the motor and improving the performance of the motor. The stress groove structure includes a left groove wall, a right groove wall, and a groove. The bottom of the groove is connected at both ends between the bottom ends of the left and right groove walls. The left and right groove walls have an N-layer toothed groove structure, where 2 < N < 5. Due to the N-layer toothed groove structure, the forces generated by the thermal fit between the compressor housing and the outer circle of the stator core can be dispersed and buffered in multiple directions. This reduces the internal stress in the stator core, which in turn reduces core loss, thus lowering the total motor loss and improving motor performance. Simultaneously, the multi-directional dispersion and buffering of the forces generated by the thermal fit of the stator core reduces the local radial dimension and deformation of the inner circle of the stator core. This results in a more uniform air gap between the stator and rotor, better coaxiality, and ensures the uniformity of the air gap magnetic field. Consequently, the high-frequency noise and harmonic noise generated by the motor and compressor are reduced and optimized. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the stator lamination structure in the prior art;

[0022] Figure 2 This is a schematic diagram of the dovetail groove structure in the prior art;

[0023] Figure 3 This is a schematic diagram of the stator lamination structure of Embodiment 1 of this utility model;

[0024] Figure 4 This is a schematic diagram of the stress groove structure of Embodiment 1 of this utility model;

[0025] Figure 5 This is a dimensional schematic diagram of the stress groove structure of Embodiment 1 of this utility model;

[0026] Figure 6This is a schematic diagram of the stator lamination structure of Embodiment 2 of this utility model;

[0027] Figure 7 This is a schematic diagram of the stress groove structure in Embodiment 2 of this utility model;

[0028] Figure 8 This is a schematic diagram of the stator lamination structure of Embodiment 3 of this utility model;

[0029] Figure 9 This is a schematic diagram of the stress groove structure in Embodiment 3 of this utility model.

[0030] In the picture:

[0031] 100. Stator lamination; 200. Stress groove structure; 300. Stator groove; 210. Left groove wall; 220. Right groove wall; 230. Groove bottom. Detailed Implementation

[0032] Please refer to the attached diagram below. Figures 1-9 This document explains the content of this utility model and its differences from existing technologies. The technical solutions (including preferred solutions) of this utility model are further described in detail below through accompanying drawings and examples of optional embodiments. It should be noted that any technical feature or solution in this embodiment is one or more of a variety of optional technical features or solutions. For the sake of brevity, this document cannot exhaustively list all alternative technical features and solutions of this utility model, nor is it convenient to emphasize that each implementation of a technical feature is one of multiple optional implementations. Therefore, those skilled in the art should understand that any technical means provided by this utility model can be replaced, or any two or more technical means or features provided by this utility model can be combined to obtain a new technical solution. No technical feature or solution in this embodiment limits the scope of protection of this utility model. The scope of protection of this utility model should include any alternative technical solutions that can be conceived by those skilled in the art without creative effort, as well as new technical solutions obtained by those skilled in the art by combining any two or more technical means or features provided by this utility model.

[0033] In the description of this invention, it should be noted that, unless otherwise stated, "a plurality of" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," "front end," "rear end," "head," "tail," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this invention 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, and therefore should not be construed as a limitation of this invention. Furthermore, the terms "first," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0034] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0035] This utility model provides a stress groove structure, a motor stator, a motor, and a compressor that improve compressor performance and reduce noise.

[0036] The following is combined with Figures 1-9 The technical solution provided by this utility model will be described in more detail.

[0037] This utility model provides a stress groove structure 200, which is disposed on a stator lamination 100 and symmetrically arranged along the radial direction of the stator lamination 100. The stress groove structure 200 includes a left groove wall 210, a right groove wall 220 and a groove bottom 230. The two ends of the groove bottom 230 are connected between the bottom ends of the left groove wall 210 and the bottom ends of the right groove wall 220. The left groove wall 210 and the right groove wall 220 are N-layer toothed groove structures, where 2 < N < 5.

[0038] The stress groove structure 200 provided by this utility model is disposed on the stator lamination 100 and symmetrically arranged along the radial direction of the stator lamination 100. The stress groove structure 200 is used to disperse and buffer the force generated by the thermal interference fit between the compressor housing and the outer circle of the stator core, which can reduce the internal stress generated in the stator core. The reduction of stress can reduce the core loss inside the stator core, thereby reducing the total loss of the motor and improving the performance of the motor.

[0039] Specifically, the stress groove structure 200 includes a left groove wall 210, a right groove wall 220, and a groove bottom 230. The two ends of the groove bottom 230 are connected between the bottom ends of the left groove wall 210 and the bottom ends of the right groove wall 220. The left groove wall 210 and the right groove wall 220 are N-layer toothed groove structures, where 2 < N < 5. Due to the N-layer toothed groove structure of the left groove wall 210 and the right groove wall 220, the force generated by the thermal interference fit between the compressor housing and the outer circle of the stator core can be dispersed and buffered in multiple directions. This can reduce the internal stress generated in the stator core. The reduction of stress can reduce the core loss inside the stator core, thereby reducing the total motor loss and improving the motor performance. Meanwhile, after the force generated by the interference fit of the stator core is dispersed and buffered in multiple directions, the local radial dimension of the inner circle of the stator core becomes smaller and the deformation is reduced. The air gap between the motor stator and rotor will be more uniform, and the coaxiality between the stator and rotor will be better. This ensures the uniformity of the magnetic field in the air gap of the motor, and the noise generated by the double-frequency noise and harmonics of the motor and compressor will be smaller and better.

[0040] It should be noted that, since the left groove wall 210 and the right groove wall 220 are N-layer toothed groove structures, each layer of toothed groove structure is connected sequentially along the depth direction, thereby forming an N-layer toothed groove structure stacked together. The N-layer toothed groove structure can better disperse and buffer the interference force, thereby better ensuring the performance and noise of the compressor.

[0041] In some embodiments of this utility model, the width dimension between the bottom of each tooth of the N-layer toothed groove structure between the left groove wall 210 and the right groove wall 220 increases sequentially from the outside to the inside along the radial direction of the stator lamination 100.

[0042] In some embodiments of this utility model described above, the width between the bottom of each tooth of the N-layer toothed groove structure between the left groove wall 210 and the right groove wall 220 increases sequentially from the outside to the inside along the radial direction of the stator lamination 100. This results in the stress groove structure 200 having a larger size in the middle and a smaller size on the outside, forming an elastic size structure similar to a spring. This allows stress to be concentrated at the maximum size position to be offset and reduced, thereby better dispersing and buffering stress. The reduction in stress can reduce the core loss inside the stator core, thereby reducing the total motor loss and improving the motor performance.

[0043] Specifically, when a three-layer toothed groove structure is provided between the left groove wall 210 and the right groove wall 220, the distance between the top of the left groove wall 210 and the top of the right groove wall 220 is L, the width of the first group of tooth bases from the outside to the inside is L1, the width of the second group of tooth bases is L2, and the width of the third group of tooth bases is L3, with L3>L2>L1>L.

[0044] In some embodiments of this utility model, the included angle between the left groove wall 210 and the right groove wall 220 is an acute angle.

[0045] In some embodiments of this utility model described above, the included angle between the left groove wall 210 and the right groove wall 220 is an acute angle, and the left groove wall 210 and the right groove wall 220 extend inward in a dovetail shape. This ensures that the stress groove structure 200 forms a structure with a larger size in the middle and a smaller size on the outer side, forming an elastic size structure similar to a spring. This allows the stress to be concentrated at the maximum size position to be offset and reduced, thereby better dispersing and buffering the stress. The reduction of stress can reduce the core loss inside the stator core, thereby reducing the total loss of the motor and improving the performance of the motor.

[0046] In some embodiments of this utility model, the middle part of the groove bottom 230 extends toward the center of the stator lamination 100.

[0047] In some of the embodiments of this utility model described above, the middle part of the groove bottom 230 extends toward the center of the stator lamination 100, thereby enabling the stress groove structure 200 to form a structure with a larger size in the middle and smaller sizes on the inner and outer sides, forming an elastic size structure similar to a spring. This allows the stress to be concentrated at the maximum size position to be offset and reduced, thereby better dispersing and buffering the stress. The reduction of stress can reduce the core loss inside the stator core, thereby reducing the total loss of the motor and improving the performance of the motor.

[0048] In some specific embodiments of this utility model, the bottom of the groove 230 is a V-shaped structure, and the included angle of the bottom of the groove 230 with the V-shaped structure is A, where 100°≤A≤160°.

[0049] In some specific embodiments of this utility model described above, the groove bottom 230 is a V-shaped structure with an included angle A, where 100°≤A≤160°. The middle part of the V-shaped structure extends toward the center of the stator lamination 100, thereby enabling the stress groove structure 200 to form a structure with a larger size in the middle and smaller sizes on the inner and outer sides, forming an elastic size structure similar to a spring. This allows the stress to be concentrated at the maximum size position to be offset and reduced, thus better dispersing and buffering the stress. The reduction in stress can reduce the core loss inside the stator core, thereby reducing the total motor loss and improving the motor performance.

[0050] In some embodiments of this utility model, the groove bottom 230 includes a plurality of toothed recesses, which are connected in sequence, and the toothed recess located in the middle of the groove bottom 230 is closest to the center of the stator lamination 100.

[0051] In some embodiments of this utility model described above, the groove bottom 230 is formed by sequentially connecting a plurality of toothed recessed grooves, and the toothed recessed groove located in the middle of the groove bottom 230 is closest to the center of the stator lamination 100. This also enables the stress groove structure 200 to form a structure with a larger size in the middle and smaller sizes on the inner and outer sides, forming an elastic size structure similar to a spring. This allows the stress to be concentrated at the maximum size position to be offset and reduced, thereby better dispersing and buffering the stress. The reduction of stress can reduce the core loss inside the stator core, thereby reducing the total loss of the motor and improving the performance of the motor.

[0052] This utility model also provides a motor stator, including a plurality of stator laminations 100, wherein the stator laminations 100 are provided with stress groove structures 200 as described above.

[0053] The motor stator of this utility model includes a plurality of stator laminations 100. The stator laminations 100 are provided with stress groove structures 200 as described above. Similarly, the stress groove structure 200 can reduce the core loss inside the stator core, thereby reducing the total loss of the motor and improving the performance of the motor.

[0054] In some embodiments of this utility model, the stator lamination 100 is further provided with a stator slot 300, the minimum yoke thickness dimension between the bottom 230 of the stator slot 300 and the outside of the stator lamination 100 is H1, and the minimum distance between the stator slot 300 and the stress groove structure 200 is H2, 0.8*H1≤H2≤1.3*H1.

[0055] In some of the embodiments of this utility model described above, 0.8*H1≤H2≤1.3*H1, which can maintain the structural stability of the motor, reduce the total loss of the motor, and improve the performance of the motor.

[0056] In some embodiments of this utility model, the stress groove structure 200 is provided with M groups, where 3≤M≤18.

[0057] This utility model also provides an electric motor, including an electric motor rotor, an electric motor housing, and an electric motor stator as described above.

[0058] This utility model also provides a compressor, including the motor described above.

[0059] Example 1:

[0060] The stress groove structure 200 provided by this utility model is disposed on the stator lamination 100 and symmetrically arranged along the radial direction of the stator lamination 100. The stress groove structure 200 includes a left groove wall 210, a right groove wall 220 and a groove bottom 230. The included angle between the left groove wall 210 and the right groove wall 220 is an acute angle. The two ends of the groove bottom 230 are connected between the bottom ends of the left groove wall 210 and the bottom ends of the right groove wall 220. The left groove wall 210 and the right groove wall 220 are three-layer toothed groove structures, which are connected sequentially along the depth direction. The groove bottom 230 is a V-shaped structure, and the included angle of the V-shaped groove bottom 230 is A, where 100°≤A≤160°.

[0061] The width between the bottom of each tooth of the three-layer toothed groove structure between the left groove wall 210 and the right groove wall 220 increases sequentially from the outside to the inside along the radial direction of the stator lamination 100.

[0062] Specifically, the distance between the top of the left groove wall 210 and the top of the right groove wall 220 is L, the width of the first group of tooth bases from the outside to the inside is L1, the width of the second group of tooth bases is L2, the width of the third group of tooth bases is L3, and L3>L2>L1>L.

[0063] The motor stator provided by this utility model includes a plurality of stator laminations 100, and the stator laminations 100 are provided with 6 sets of stress groove structures 200 as described above.

[0064] Furthermore, the stator lamination 100 is also provided with a stator slot 300, the minimum yoke thickness dimension between the bottom 230 of the stator slot 300 and the outside of the stator lamination 100 is H1, and the minimum distance between the stator slot 300 and the stress groove structure 200 is H2, 0.8*H1≤H2≤1.3*H1.

[0065] This utility model also provides an electric motor, including an electric motor rotor, an electric motor housing, and an electric motor stator as described above.

[0066] This utility model also provides a compressor, including the motor described above.

[0067] Example 2:

[0068] The difference between this embodiment 2 and embodiment 1 is that the bottom of the groove 230 includes a plurality of toothed recesses, which are connected in sequence, and the toothed recess located in the middle of the bottom of the groove 230 is closest to the center of the stator lamination 100.

[0069] Example 3:

[0070] The difference between this embodiment 3 and embodiment 1 is that the left groove wall 210 and the right groove wall 220 are two-layer toothed groove structures.

[0071] For Embodiments 1, 2, and 3 above, tests were conducted on the motor stators in the three embodiments, the dovetail groove structure motor stator in the prior art, and the stress-free groove motor stator, respectively, and the following data were obtained:

[0072] Comparison Case 1 none 0.025 93.02 Comparison Case 2 Existing single-layer gap 0.022 93.03 Implementation Cases 2-layered, arrow-shaped at the bottom 0.019 93.06 Implementation Case 2 3-layered, arrow-shaped at the bottom 0.017 93.07 Implementation Case 3 3-layered, fully toothed 0.016 93.08

[0073] The data shows that the stress groove structure in this patent application has a better stress relief effect. In particular, the stress relief effect in Embodiment 3 is even better.

[0074] In the description of this specification, references to terms such as "example," "embodiment," or "some embodiments" indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0075] Of course, the present invention is not limited to the above-described embodiments. Those skilled in the art can make equivalent modifications or substitutions without departing from the spirit of the present invention. All such equivalent modifications or substitutions are included within the scope defined by the claims of this application.

Claims

1. A stress groove structure, characterized in that, The stress groove structure, which is installed on the stator lamination, includes a left groove wall, a right groove wall, and a groove bottom. The two ends of the groove bottom are connected between the bottom ends of the left groove wall and the bottom ends of the right groove wall. The left groove wall and the right groove wall are N-layer toothed groove structures, where 2 < N < 5.

2. The stress groove structure according to claim 1, characterized in that, The width between the bottom of each tooth of the N-layer toothed groove structure between the left and right groove walls increases sequentially from the outside to the inside along the radial direction of the stator lamination.

3. The stress groove structure according to claim 1, characterized in that, The angle between the left and right tank walls is an acute angle.

4. The stress groove structure according to claim 1, characterized in that, The stress groove structure is arranged symmetrically along the radial direction of the stator lamination.

5. The stress groove structure according to any one of claims 1-4, characterized in that, The middle part of the groove bottom extends toward the center of the stator lamination.

6. The stress groove structure according to claim 5, characterized in that, The bottom of the trough has a V-shaped structure, and the included angle of the bottom of the V-shaped trough is A, where 100°≤A≤160°.

7. The stress groove structure according to claim 5, characterized in that, The bottom of the groove includes a plurality of toothed recesses, which are connected in sequence, and the toothed recess located in the middle of the bottom of the groove is closest to the center of the stator lamination.

8. A motor stator, characterized in that, It includes a plurality of stator laminations, wherein the stator laminations are provided with stress groove structures as described in any one of claims 1-7.

9. The motor stator according to claim 8, characterized in that, The stator lamination is also provided with a stator slot. The minimum yoke thickness between the bottom of the stator slot and the outside of the stator lamination is H1, and the minimum distance between the stator slot and the stress groove structure is H2, where 0.8*H1≤H2≤1.3*H1.

10. The motor stator according to claim 8, characterized in that, The stress groove structure is provided in M ​​groups, where 3 ≤ M ≤ 18.

11. An electric motor, characterized in that, It includes a motor rotor, a motor housing, and a motor stator as described in any one of claims 8-10.

12. A compressor, characterized in that, Including the motor as described in claim 11.

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