Stator lamination, motor, and compressor
By optimizing the design of the stator laminations, the problem of reduced motor efficiency caused by changes in winding materials was solved, resulting in improved motor efficiency and enhanced operational stability.
Patent Information
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- GUANGDONG MEIZHI COMPRESSOR
- Filing Date
- 2025-05-20
- Publication Date
- 2026-07-16
AI Technical Summary
Existing technology increases resistivity by changing the winding material to aluminum enameled wire, which leads to increased motor winding losses, reduced motor efficiency, and affects compressor performance.
The stator laminations are designed, including the yoke and the teeth. The stator slots are divided into a large-area first stator slot and a small-area second stator slot. The winding distribution and magnetic flux path are optimized, and the motor efficiency and performance are improved through a specific size ratio (D1, D3, W).
The current density distribution is optimized, reducing energy loss, improving motor efficiency, reducing winding heat generation, and enhancing the reliability and stability of motor operation.
Smart Images
Figure CN2025096054_16072026_PF_FP_ABST
Abstract
Description
Stator laminations, motors and compressors
[0001] Related applications
[0002] This application claims priority to Chinese patent application No. 202510019124.2, filed on January 7, 2025, the entire contents of which are incorporated herein by reference. Technical Field
[0003] This application relates to the field of motor technology, and in particular to a stator lamination, a motor, and a compressor. Background Technology
[0004] In recent years, with the increasing prominence of energy and environmental issues, refrigeration systems have been developing towards energy conservation and environmental protection. The compressor is one of the core components of the refrigeration system, and single-phase induction motors are widely used in compressors for refrigeration systems due to their high energy efficiency and simple structure.
[0005] Currently, most companies in the industry reduce motor costs by changing the winding material (from copper enameled wire to aluminum enameled wire). However, after changing the winding material, the increased resistivity leads to a significant increase in motor winding losses, which reduces motor efficiency and thus affects compressor performance, failing to meet product requirements. Summary of the Invention
[0006] The main objective of this application is to provide a stator lamination, a motor, and a compressor, which aim to improve the motor efficiency of an aluminum wire induction motor.
[0007] To achieve the above objectives, the stator lamination proposed in this application includes:
[0008] yoke;
[0009] Multiple teeth are spaced apart on the inner periphery of the yoke, and stator slots are formed between two adjacent teeth. The multiple stator slots include multiple first stator slots and multiple second stator slots. The area of the first stator slot is larger than the area of the second stator slot. The first stator slot has a first slot opening and a first slot bottom opposite to the first slot opening. The second stator slot has a second slot opening and a second slot bottom opposite to the second slot opening.
[0010] Wherein, D1 is twice the distance from the bottom of the first slot to the center of the stator lamination, D2 is twice the distance from the bottom of the second slot to the center of the stator lamination, W is the width of the stator slot, D3 is the inner diameter of the tooth, D1 and D3 satisfy 0.28≤(D1-D3) / 2D3≤0.31, W and D3 satisfy 0.136≤W / D3≤0.142, S1 is the sum of the areas of all stator slots, S2 is the area of the stator lamination with a first surface, and 0.4≤S1 / S2≤0.6.
[0011] In one embodiment, the width of the stator slot gradually increases from the opening of the stator slot to the bottom of the stator slot, and the width of the stator slot from the center of the stator lamination to the position of (D1+D3) / 2 of the stator slot is W.
[0012] In one embodiment, the outer periphery of the yoke includes multiple arc-shaped segments and multiple straight segments, the outer diameter of the arc-shaped segments is L1, and twice the distance from the center of the stator lamination to the straight segments is L2. L1, L2, D1 and D2 satisfy 0.95≤(D1-D2) / (L1-L2)≤1.05.
[0013] In one embodiment, the distance from the first slot opening to the first slot bottom is greater than the distance from the second slot opening to the second slot bottom.
[0014] In one embodiment, L1 satisfies 60mm≤L1≤200mm.
[0015] In one embodiment, two of the plurality of straight edge segments are spaced apart by at least one arc edge segment, and the two straight edge segments are arranged opposite each other in the radial direction of the stator lamination.
[0016] In one embodiment, D3 satisfies 30mm≤D3≤100mm.
[0017] In one embodiment, two of the plurality of first stator slots are spaced apart by at least one second stator slot, and the two first stator slots are arranged opposite each other in the radial direction of the stator lamination; two of the plurality of second stator slots are spaced apart by at least one first stator slot, and the two second stator slots are arranged opposite each other in the radial direction of the stator lamination.
[0018] This application also proposes an electric motor, the motor including stator laminations, each stator lamination including a yoke and a plurality of teeth, the plurality of teeth being spaced apart on the inner periphery of the yoke, and stator slots being formed between adjacent teeth, the plurality of stator slots including a plurality of first stator slots and a plurality of second stator slots, the area of the first stator slots being larger than the area of the second stator slots, the first stator slots having a first slot opening and a first slot bottom opposite to the first slot opening, and the second stator slots having a second slot opening and a second slot bottom opposite to the second slot opening; wherein, D1 is twice the distance from the bottom of the first slot to the center of the stator lamination, D2 is twice the distance from the bottom of the second slot to the center of the stator lamination, W is the width of the stator slot, D3 is the inner diameter of the tooth, D1 and D3 satisfy 0.28≤(D1-D3) / 2D3≤0.31, W and D3 satisfy 0.136≤W / D3≤0.142, S1 is the sum of the areas of all stator slots, S2 is the area of the stator lamination with a first surface, and 0.4≤S1 / S2≤0.6.
[0019] This application also proposes a compressor, which includes a motor, the motor including stator laminations, each stator lamination including a yoke and a plurality of teeth, the plurality of teeth being spaced apart on the inner periphery of the yoke, and stator slots being formed between adjacent teeth, the plurality of stator slots including a plurality of first stator slots and a plurality of second stator slots, the area of the first stator slots being larger than the area of the second stator slots, the first stator slots having a first slot opening and a first slot bottom opposite to the first slot opening, and the second stator slots having a second slot opening and a second slot bottom opposite to the second slot opening. The stator slot bottom; wherein, twice the distance from the first slot bottom to the center of the stator lamination is D1, twice the distance from the second slot bottom to the center of the stator lamination is D2, the slot width of the stator slot is W, the inner diameter of the tooth is D3, D1 and D3 satisfy 0.28≤(D1-D3) / 2D3≤0.31, W and D3 satisfy 0.136≤W / D3≤0.142, the sum of the areas of all stator slots is S1, the stator lamination has a first surface, the area of the first surface is S2, and 0.4≤S1 / S2≤0.6. Attached Figure Description
[0020] To more clearly illustrate the technical solutions in the embodiments of this application 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 application. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.
[0021] Figure 1 is a schematic diagram of the stator lamination provided in this application;
[0022] Figure 2 is a structural schematic diagram of one embodiment of Figure 1;
[0023] Figure 3 is a structural schematic diagram of Figure 1 in another embodiment;
[0024] Figure 4 is a structural schematic diagram of Figure 1 in another embodiment, where the shaded area represents the area of the multiple stator slots S1.
[0025] Explanation of icon numbers:
[0026] 1. Stator lamination; 11. Yoke; 111. Outer periphery; 111a. Straight edge section; 111b. Arc edge section; 12. Tooth section; 13. Stator slot; 131. First stator slot; 131a. First slot opening; 131b. First slot bottom; 132. Second stator slot; 132a. Second slot opening; 132b. Second slot bottom; 14. First surface.
[0027] The realization of the purpose, functional features and advantages of this application will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Embodiments of the present invention
[0028] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.
[0029] It should be noted that if the embodiments of this application involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.
[0030] Furthermore, if the embodiments of this application involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution that simultaneously satisfies A and B. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed in this application.
[0031] In recent years, with the increasing prominence of energy and environmental issues, refrigeration systems have been developing towards energy conservation and environmental protection. The compressor is one of the core components of the refrigeration system, and single-phase induction motors are widely used in compressors for refrigeration systems due to their high energy efficiency and simple structure.
[0032] Currently, most companies in the industry reduce motor costs by changing the winding material (from copper enameled wire to aluminum enameled wire). However, after changing the winding material, the increased resistivity leads to a significant increase in motor winding losses, which reduces motor efficiency and thus affects compressor performance, failing to meet product requirements.
[0033] In view of this, this application proposes a stator lamination 1.
[0034] Please refer to Figures 1 to 3. In one embodiment of this application, the stator lamination 1 includes a yoke 11 and a plurality of teeth 12. The plurality of teeth 12 are spaced apart on the inner periphery of the yoke 11. A stator slot 13 is formed between two adjacent teeth 12. The plurality of stator slots 13 include a plurality of first stator slots 131 and a plurality of second stator slots 132. The area of the first stator slot 131 is larger than the area of the second stator slot 132. The first stator slot 131 has a first slot opening 131a and a first slot bottom 131b opposite to the first slot opening 131a. The second stator slot 132 has a second slot opening 132a and a second slot bottom 132b opposite to the second slot opening 132a. a. The second groove bottom 132b is opposite to the first groove bottom 131b. D1 is twice the distance from the center of the stator lamination 1, and D2 is twice the distance from the center of the second groove bottom 132b to the stator lamination 1. The groove width of the stator groove 13 is W, and the inner diameter of the tooth 12 is D3. D1 and D3 satisfy 0.28≤(D1-D3) / 2D3≤0.31, and W and D3 satisfy 0.136≤W / D3≤0.142. The area of the plurality of stator grooves 13 is S1, and the stator lamination 1 has a first surface 14 with an area of S2. 0.4≤S1 / S2≤0.6.
[0035] The stator lamination 1 includes a yoke 11 and a plurality of teeth 12, which are integrally stamped together with the yoke 11. The yoke 11 is generally annular, and the teeth 12 protrude from the inner circumference of the yoke 11 and are positioned in the middle of the yoke 11. In this embodiment, the number of teeth 12 is set to 24; however, the number of teeth 12 can be less than or greater than 24. Stator slots 13 are formed between adjacent teeth 12, and the number of stator slots 13 is the same as the number of teeth 12. In other embodiments, the area of the multiple stator slots 13 can be uniform. However, in this embodiment, the multiple stator slots 13 are divided into multiple first stator slots 131 and multiple second stator slots 132. The area of the first stator slot 131 is greater than the area of the second stator slot 132. This can be because the width of the first stator slot 131 is greater than the width of the second stator slot 132, the depth of the first stator slot 131 is greater than the depth of the second stator slot 132, or both the width and depth of the first stator slot 131 are greater than the width and depth of the second stator slot 132.
[0036] By defining the relationships between D1, D2, and D3 as described above, the winding distribution and flux path of the motor can be optimized, making the total magnetic field generated by the windings more sinusoidal. The area of the first stator slot 131 is larger than that of the second stator slot 132, which allows for greater flexibility in winding arrangement, thereby optimizing current density distribution and reducing energy loss. Simultaneously, the specific dimensional ratios (D1, D3, W) ensure the structural rationality of the stator slots 13 and the teeth 12, further improving the efficiency and performance of the motor.
[0037] In this embodiment, D1 is twice the distance from the bottom of the first slot 131b to the center of the stator lamination 1, and D3 is the inner diameter of the tooth 12. The ratio of D1-D3 to 2D3 is between 0.28 and 0.31. The motor with this stator lamination 1 has good motor efficiency. Specific experimental data are shown in the table below:
[0038] (D1-D3) / 2D3 0.27 0.28 0.29 0.30.31 0.32 Motor efficiency (%) 78.5% 79.5% 81% 81% 79.5% 78.5% Winding heat generation (W) 90W 70W 55W 55W 70W 90W
[0039] It can be seen that when the ratio of D1-D3 to 2D3 is less than 0.28 or greater than 0.31, the motor efficiency is poor, below 80%, and the winding heat generation is high, above 70W. When the ratio of D1-D3 to 2D3 is between 0.29 and 0.3, the motor efficiency is high, all above 80%, and ideally above 81%. The motor winding heat generation is low, at 55W.
[0040] Specifically, the area S1 of the multiple stator slots 13 is the sum of the areas of all stator slots 13. The shape of the stator slot 13 is composed of a trapezoid and a semicircle. Therefore, the area of the stator slot 13 is the sum of the areas of the trapezoid and the semicircle. The area at the slot opening of the stator slot 13 is not included in the area of the stator slot 13. S1 should not be too large, as this will reduce the proportion of the stator lamination 1 and thus reduce the structural strength of the stator lamination 1 itself. S1 should also not be too small, as this will increase the resistance of the winding and reduce the efficiency of the motor. Therefore, an appropriate value of S1 should be selected to maintain the high efficiency of the motor.
[0041] Furthermore, the area of the first surface 14 is the area of one side of the stator lamination 1. The area of the first surface 14 is the area of the circle with diameter L2 minus the area of the circle with diameter D3, then subtracting the area of S1, and then subtracting the area of the shape formed by the extension of the arc edge segment 111b and the straight edge segment 111a. By limiting the ratio of the area S2 of the stator lamination 1 to the area S1 of the multiple stator slots 13 to be between 0.4 and 0.6, it is ensured that the area of the stator slots 13 is not too large, so that the stator lamination 1 has good structural strength, and the area of the stator slots 13 is not too small, so that the stator slots 13 help the windings dissipate heat, thereby avoiding motor overheating.
[0042] The technical solution of this application improves the motor efficiency of the motor with the stator lamination 1, reduces the heat generation of the motor, and improves the reliability and stability of the motor during operation by adopting a reasonable design of the dimensions of the stator lamination 1 and the stator slot 13.
[0043] In one embodiment, referring to Figures 2 and 3, the width of the stator slot 13 gradually increases from the opening of the stator slot 13 to the bottom of the stator slot 13, and the width of the stator lamination 1 at the position (D1+D3) / 2 of the stator slot 13 is W.
[0044] The width of the stator slot 13 gradually increases from the opening of the stator slot 13 to the bottom of the stator slot 13, that is, the width of the slot is the width at half the depth path of the stator slot 13.
[0045] In one embodiment, please continue to refer to Figures 2 and 3. The outer periphery 111 of the yoke 11 includes a plurality of arc-shaped segments 111b and a plurality of straight segments 111a. The outer diameter of the arc-shaped segment 111b is L1. The distance from the center of the stator lamination 1 to the straight segment 111a is twice the distance L2. L1, L2, D1 and D2 satisfy 0.95≤(D1-D2) / (L1-L2)≤1.05.
[0046] Considering that the motor using the stator lamination 1 is used inside the compressor, in order to allow the refrigerant to pass through the outside of the motor and thus achieve a better heat dissipation effect, the outer periphery 111 of the stator lamination 1 is arranged to be composed of multiple arc edge segments 111b and multiple straight edge segments 111a alternately, so that the refrigerant can pass through the outside of the straight edge segment 111a.
[0047] Furthermore, in one embodiment, referring to FIG1, the distance from the first slot 131a to the first slot bottom 131b is greater than the distance from the second slot 132a to the second slot bottom 132b.
[0048] The distance from the first slot opening 131a to the bottom of the first slot 131b is the slot depth of the first stator slot 131, and the distance from the second slot opening 132a to the bottom of the second slot 132b is the slot depth of the second stator slot 132. Therefore, by setting the slot depth of the first stator slot 131 to be different from the slot depth of the second stator slot 132, the area of the first stator slot 131 is made larger than the area of the second stator slot 132. By adjusting the area of the stator slot 131, the number of turns of the winding can be adjusted, thereby improving the working efficiency of the motor.
[0049] In one embodiment, referring to Figure 2, L1 satisfies 60mm≤L1≤200mm.
[0050] Specifically, by limiting L1 to a minimum of 60mm, the motor can maintain a certain degree of structural compactness, avoiding excessively large motor sizes and thus saving space and cost. Furthermore, L1 should not be too large, thereby ensuring the motor's operational reliability. A reasonable range for L1 helps optimize the motor's electromagnetic performance, ensuring a stable electromagnetic distribution and high efficiency during operation.
[0051] In one embodiment, referring to FIG2, two of the plurality of straight edge segments 111a are separated by at least one arc edge segment 111b, and the two straight edge segments 111a are arranged opposite each other in the radial direction of the stator lamination 1.
[0052] Specifically, the stator lamination 1 has four straight edge segments 111a and four curved edge segments 111b, which are staggered. The four straight edge segments 111a are divided into two groups, and two straight edge segments 111a in any group are arranged opposite each other in the radial direction of the stator lamination 1. Therefore, L1 is the distance between the two straight edge segments 111a in any group.
[0053] In one embodiment, referring to Figure 2, D3 satisfies 30mm≤D3≤100mm.
[0054] Furthermore, limiting the range of D3 helps ensure the structural stability of the motor, preventing vibration and noise caused by structural instability during operation. Limiting D3 also allows for more rational use of materials, avoiding waste and overuse, thus helping to reduce costs.
[0055] In one embodiment, referring to FIG1, two of the plurality of first stator slots 131 are spaced apart by at least one second stator slot 132, and the two first stator slots 131 are arranged opposite each other in the radial direction of the stator lamination 1; two of the plurality of second stator slots 132 are spaced apart by at least one first stator slot 131, and the two second stator slots 132 are arranged opposite each other in the radial direction of the stator lamination 1. This design optimizes the distribution of the windings within the stator slots 13, reduces current density non-uniformity, thereby reducing energy loss and winding temperature.
[0056] This application also proposes an electric motor, which includes a stator lamination 1. The specific structure of the stator lamination 1 is as described in the above embodiments. Since this electric motor adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here.
[0057] This application also proposes a compressor, which includes a motor. The specific structure of the motor is as described in the above embodiments. Since this compressor adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here.
[0058] The above description is merely an exemplary embodiment of this application and does not limit the patent scope of this application. Any equivalent structural transformations made based on the technical concept of this application and the contents of the specification and drawings of this application, or direct / indirect applications in other related technical fields, are included within the patent protection scope of this application.
Claims
1. A stator lamination, wherein, The stator laminations include: yoke; Multiple teeth are spaced apart on the inner periphery of the yoke, and stator slots are formed between two adjacent teeth. The multiple stator slots include multiple first stator slots and multiple second stator slots. The area of the first stator slot is larger than the area of the second stator slot. The first stator slot has a first slot opening and a first slot bottom opposite to the first slot opening. The second stator slot has a second slot opening and a second slot bottom opposite to the second slot opening. Wherein, D1 is twice the distance from the bottom of the first slot to the center of the stator lamination, D2 is twice the distance from the bottom of the second slot to the center of the stator lamination, W is the width of the stator slot, D3 is the inner diameter of the tooth, D1 and D3 satisfy 0.28≤(D1-D3) / 2D3≤0.31, W and D3 satisfy 0.136≤W / D3≤0.142, S1 is the sum of the areas of all stator slots, S2 is the area of the stator lamination with a first surface, and 0.4≤S1 / S2≤0.
6.
2. The stator lamination as described in claim 1, wherein, The width of the stator slot gradually increases from the opening of the stator slot to the bottom of the stator slot, and the width of the stator slot from the center of the stator lamination to the position of (D1+D3) / 2 of the stator slot is W.
3. The stator lamination as described in claim 1 or 2, wherein, The outer periphery of the yoke includes multiple arc-shaped segments and multiple straight segments. The outer diameter of the arc-shaped segment is L1, and twice the distance from the center of the stator lamination to the straight segment is L2. L1, L2, D1, and D2 satisfy 0.95≤(D1-D2) / (L1-L2)≤1.
05.
4. The stator lamination as described in any one of claims 1 to 3, wherein, The distance from the first slot opening to the bottom of the first slot is greater than the distance from the second slot opening to the bottom of the second slot.
5. The stator lamination as described in claim 3 or 4, wherein, The L1 satisfies 60mm≤L1≤200mm.
6. The stator lamination as described in any one of claims 3 to 5, wherein, Two of the plurality of straight edge segments are separated by at least one arc edge segment, and the two straight edge segments are arranged opposite each other in the radial direction of the stator lamination.
7. The stator lamination as described in any one of claims 1 to 6, wherein, The D3 satisfies 30mm≤D3≤100mm.
8. The stator lamination as described in any one of claims 1 to 7, wherein, Two of the plurality of first stator slots are separated by at least one second stator slot, and the two first stator slots are arranged opposite each other in the radial direction of the stator lamination; two of the plurality of second stator slots are separated by at least one first stator slot, and the two second stator slots are arranged opposite each other in the radial direction of the stator lamination.
9. An electric motor, wherein, The motor includes stator laminations as described in any one of claims 1 to 8.
10. A compressor, wherein, The compressor includes the motor as described in claim 9.