Stator punching sheet, motor and compressor

Abstract

The invention discloses a stator punching sheet, a motor and a compressor, and relates to the technical field of motors, the stator punching sheet comprises a yoke part and a plurality of tooth parts, the plurality of tooth parts are arranged on the inner circumference of the yoke part at intervals, a stator slot is formed between two adjacent tooth parts, the plurality of stator slots comprise a plurality of first stator slots and a plurality of second stator slots, and the plurality of first stator slots and the plurality of second stator slots are arranged at intervals. The area of the first stator slot is larger than that of the second stator slot; wherein the distance between the first groove bottom and the center of the stator punching sheet is two times D1, the distance between the second groove bottom and the center of the stator punching sheet is two times D2, the groove width of each stator groove is W, the inner diameter of each tooth part is D3, D1 and D3 meet the condition that (D1-D3) / 2D3 is larger than or equal to 0.28 and smaller than or equal to 0.31, and W and D3 meet the condition that W / D3 is larger than or equal to 0.136 and smaller than or equal to 0.142. According to the technical scheme, the sizes of the stator punching sheet and the stator grooves are reasonably designed, so that the motor efficiency of the motor with the stator punching sheet is improved, the heating value of the motor is reduced, and the reliability and the stability of the motor in the operation process are improved.

Description

Technical Field

[0001] The invention relates to the technical field of motors, and in particular to a stator punching sheet, a motor and a compressor. Background Art

[0002] In recent years, as energy and environmental issues have become increasingly prominent, refrigeration systems have also been continuously developing towards energy conservation and environmental protection. The compressor is one of the core components in 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.

[0003] Currently, most of the methods used in the industry to reduce motor costs are by changing the winding material (copper enameled wire to aluminum enameled wire). However, after the winding material is changed, the increase in resistivity leads to a significant increase in the winding loss of the motor, which reduces the efficiency of the motor, thus affecting the performance of the compressor and failing to meet product demand. Summary of the invention

[0004] The main purpose of the present invention is to provide a stator punching sheet, a motor and a compressor, aiming to improve the motor efficiency of an aluminum wire induction motor.

[0005] To achieve the above-mentioned purpose, the stator punching sheet proposed in the present invention comprises: yoke; A plurality of teeth portions are arranged at intervals on the inner periphery of the yoke portion, a stator slot is formed between two adjacent teeth portions, the plurality of stator slots include a plurality of first stator slots and a plurality of second stator slots, the area of ​​the first stator slots is greater than the area of ​​the second stator slots, the first stator slots have a first slot opening and a first slot bottom opposite to the first slot opening, and the second stator slots have a second slot opening and a second slot bottom opposite to the second slot opening; Wherein, twice the distance from the bottom of the first slot to the center of the stator punching sheet is D1, twice the distance from the bottom of the second slot to the center of the stator punching sheet is D2, the slot width of the stator slot is W, the inner diameter of the tooth portion 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 punching sheet has a first surface, the area of ​​the first surface is S2, and 0.4≤S1 / S2≤0.6.

[0006] In one embodiment, the slot width of the stator slot gradually increases from the slot opening of the stator slot to the slot bottom of the stator slot, and the slot width from the center of the stator punching sheet to the position of (D1+D3) / 2 of the stator slot is W.

[0007] In one embodiment, the outer periphery of the yoke includes a plurality of arc edge segments and a plurality of straight edge segments, the outer diameter of the arc edge segment is L1, twice the distance from the center of the stator punching sheet to the straight edge segment is L2, and L1, L2, D1 and D2 satisfy 0.95≤(D1-D2) / (L1-L2)≤1.05.

[0008] In one embodiment, a distance from the first notch to the first groove bottom is greater than a distance from the second notch to the second groove bottom.

[0009] In one embodiment, L1 satisfies 60mm≤L1≤200mm.

[0010] In one embodiment, 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 to each other in the radial direction of the stator punching sheet.

[0011] In one embodiment, D3 satisfies 30 mm ≤ D3 ≤ 100 mm.

[0012] In one embodiment, two of the plurality of first stator slots are separated by at least one of the second stator slots, and the two first stator slots are arranged opposite to each other in the radial direction of the stator punching sheet; two of the plurality of second stator slots are separated by at least one of the first stator slots, and the two second stator slots are arranged opposite to each other in the radial direction of the stator punching sheet.

[0013] The present invention further proposes a motor, the motor comprising a stator punching sheet, the stator punching sheet comprising a yoke and a plurality of tooth portions, the plurality of tooth portions being arranged at intervals on the inner periphery of the yoke, a stator slot being formed between two adjacent tooth portions, the plurality of stator slots comprising a plurality of first stator slots and a plurality of second stator slots, the area of ​​the first stator slot being greater than the area of ​​the second stator slot, the first stator slot having a first slot opening and a first slot bottom opposite to the first slot opening, the second stator slot 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 punching sheet, D2 is twice the distance from the bottom of the second slot to the center of the stator punching sheet, the slot width of the stator slot is W, the inner diameter of the tooth portion 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 punching sheet has a first surface, the area of ​​the first surface is S2, and 0.4≤S1 / S2≤0.6.

[0014] The present invention further provides a compressor, the compressor comprising a motor, the motor comprising a stator punching sheet, the stator punching sheet comprising a yoke and a plurality of tooth portions, the plurality of tooth portions being arranged at intervals on the inner periphery of the yoke, a stator slot being formed between two adjacent tooth portions, the plurality of stator slots comprising a plurality of first stator slots and a plurality of second stator slots, the area of ​​the first stator slot being greater than the area of ​​the second stator slot, the first stator slot having a first slot opening and a first slot bottom opposite to the first slot opening, the second stator slot having a second slot opening and a second slot bottom opposite to the second slot opening Slot bottom; wherein, twice the distance from the first slot bottom to the center of the stator punching sheet is D1, twice the distance from the second slot bottom to the center of the stator punching sheet is D2, the slot width of the stator slot is W, the inner diameter of the tooth portion is D3, the D1 and D3 satisfy 0.28≤(D1-D3) / 2D3≤0.31, the W and D3 satisfy 0.136≤W / D3≤0.142, the sum of the areas of all stator slots is S1, the stator punching sheet has a first surface, the area of ​​the first surface is S2, and the 0.4≤S1 / S2≤0.6.

[0015] The technical solution of the present invention improves the motor efficiency of the motor having the stator punching sheet, reduces the heat generated by the motor, and improves the reliability and stability of the motor during operation by reasonably designing the sizes of the stator punching sheet and the stator slot. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0017] Figure 1 A schematic diagram of the structure of the stator punching sheet provided by the present invention; Figure 2 for Figure 1 A schematic diagram of a structure in an embodiment; Figure 3 for Figure 1 A schematic structural diagram of another embodiment; Figure 4 for Figure 1 A schematic structural diagram of yet another embodiment, wherein the shaded portion is the area of ​​a plurality of stator slots S1.

[0018] Description of Figure Numbers: 1. stator punching sheet; 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.

[0019] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0021] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0022] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features limited to "first" and "second" may explicitly or implicitly include at least one of the features. In addition, if "and / or" or "and / or" appears in the full text, its meaning includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or solutions that satisfy both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0023] In recent years, as energy and environmental issues have become increasingly prominent, refrigeration systems have also been continuously developing towards energy conservation and environmental protection. The compressor is one of the core components in 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.

[0024] Currently, most of the methods used in the industry to reduce motor costs are by changing the winding material (copper enameled wire to aluminum enameled wire). However, after the winding material is changed, the increase in resistivity leads to a significant increase in the winding loss of the motor, which reduces the efficiency of the motor, thus affecting the performance of the compressor and failing to meet product demand.

[0025] In view of this, the present invention provides a stator punching sheet 1 .

[0026] See also Figures 1 to 3 In one embodiment of the present invention, the stator punching sheet 1 includes a yoke 11 and a plurality of teeth 12, the plurality of teeth 12 are arranged at intervals 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 slots 131 is larger than the area of ​​the second stator slots 132, the first stator slots 131 have a first slot opening 131a and a first slot bottom 131b opposite to the first slot opening 131a, the second stator slots 132 have a second slot opening 132a and a first slot bottom 131b opposite to the second slot opening 132a The second groove bottom 132b; wherein, twice the distance from the first groove bottom 131b to the center of the stator punching sheet 1 is D1, twice the distance from the second groove bottom 132b to the center of the stator punching sheet 1 is D2, the groove width of the stator slot 13 is W, the inner diameter of the tooth portion 12 is D3, the D1 and D3 satisfy 0.28≤(D1-D3) / 2D3≤0.31, the W and D3 satisfy 0.136≤W / D3≤0.142, the area of ​​the plurality of stator slots 13 is S1, the stator punching sheet 1 has a first surface 14, the area of ​​the first surface 14 is S2, and the 0.4≤S1 / S2≤0.6.

[0027] It should be noted that the stator punching sheet 1 includes a yoke 11 and a plurality of teeth 12, and the plurality of teeth 12 and the yoke 11 are integrally stamped. The yoke 11 is roughly annular, and the teeth 12 protrude from the inner periphery of the yoke 11 and are arranged in the middle of the yoke 11. In this embodiment, the number of teeth 12 is set to 24. Of course, the number of teeth 12 can also be less than 24, or the number of teeth 12 can also be greater than 24. Stator slots 13 are formed between adjacent teeth 12, wherein the number of stator slots 13 is consistent with the number of teeth 12, and in other embodiments, the areas between the plurality of stator slots 13 can be consistent. However, in this embodiment, the plurality of stator slots 13 are divided into 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 slot width of the first stator slot 131 may be larger than the slot width of the second stator slot 132, or the slot depth of the first stator slot 131 may be larger than the slot depth of the second stator slot 132, or both the slot width and slot depth of the first stator slot 131 may be larger than the slot width and slot depth of the second stator slot 132.

[0028] It can be understood that, through the above-mentioned definition of the relationship between D1, D2 and D3, the winding distribution and magnetic flux path of the motor can be optimized, so that the total magnetic field generated by the winding is more sinusoidal. The area of ​​the first stator slot 131 is larger than the area of ​​the second stator slot 132, which helps to achieve greater flexibility in the winding arrangement, thereby optimizing the current density distribution and reducing energy loss. At the same time, through the specific size ratio relationship (the relationship between D1, D3, and W), the structural rationality of the stator slot 13 and the tooth portion 12 is ensured, and the efficiency and performance of the motor are further improved.

[0029] In this embodiment, twice the distance from the first slot bottom 131b to the center of the stator punching sheet 1 is D1, the inner diameter of the tooth portion 12 is D3, wherein the ratio of D1-D3 to 2D3 is between 0.28 and 0.31, and the motor having the stator punching sheet 1 has a good motor efficiency. The specific experimental data refer to the following table:

[0030] It can be seen that when the ratio of D1-D3 to 2D3 is less than 0.28 or greater than 0.31, the efficiency of the motor 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 efficiency of the motor is high, all above 80%, and it is best to reach above 81%. The motor winding heat generation is low, and the winding heat generation is 55W.

[0031] Specifically, the area S1 of multiple stator slots 13 is the sum of the areas of all stator slots 13, wherein the shape of the stator slot 13 is composed of a trapezoid and a semicircle, so the area of ​​the stator slot 13 is the sum of the area of ​​the trapezoid and the area of ​​the semicircle, and the area at the slot mouth of the stator slot 13 is not included in the area of ​​the stator slot 13. S1 should not be too large, otherwise the proportion of the stator punching sheet 1 will be reduced, thereby reducing the structural strength of the stator punching sheet 1 itself. S1 should not be too small either, otherwise the resistance of the winding will increase, thereby reducing the efficiency of the motor. Therefore, a suitable value of S1 should be selected to maintain a high efficiency of the motor.

[0032] In addition, the area of ​​the first surface 14 is the area of ​​one side of the stator sheet 1, and the area of ​​the first surface 14 is the area of ​​the circle with L2 as the diameter minus the area of ​​the circle with D3 as the diameter, then subtracting the area of ​​S1, and then subtracting the area of ​​the figure formed by the extension line of the arc edge segment 111b and the straight edge segment 111a. By limiting the ratio of the area S2 of the stator sheet 1 to the area S1 of the plurality of stator slots 13 to be between 0.4 and 0.6, it is ensured that the area of ​​the stator slot 13 is not too large, so that the stator sheet 1 has good structural strength, and the area of ​​the stator slot 13 is not too small, and the stator slot 13 helps the winding to dissipate heat, thereby avoiding overheating of the motor.

[0033] The technical solution of the present invention improves the motor efficiency of the motor having the stator punching sheet 1, reduces the heat generated by the motor, and improves the reliability and stability of the motor during operation by reasonably designing the sizes of the stator punching sheet 1 and the stator slot 13.

[0034] In one embodiment, see Figure 2 and Figure 3 The slot width of the stator slot 13 gradually increases from the slot opening of the stator slot 13 to the slot bottom of the stator slot 13 , and the slot width from the center of the stator punching sheet 1 to the position of (D1+D3) / 2 of the stator slot 13 is W.

[0035] It should be noted that the slot width of the stator slot 13 gradually increases from the slot opening of the stator slot 13 to the slot bottom of the stator slot 13 , that is, the slot width is the slot width at a half position of the depth direction path of the stator slot 13 .

[0036] In one embodiment, please continue to refer to Figure 2 and Figure 3 The outer periphery 111 of the yoke 11 includes a plurality of arc edge segments 111b and a plurality of straight edge segments 111a, the outer diameter of the arc edge segment 111b is L1, and twice the distance from the center of the stator punching sheet 1 to the straight edge segment 111a is L2, and L1, L2, D1 and D2 satisfy 0.95≤(D1-D2) / (L1-L2)≤1.05.

[0037] It should be noted that, considering that the motor using the stator punching sheet 1 is used in a compressor, in order to allow the refrigerant to pass through the outside of the motor to achieve a better heat dissipation effect, the outer periphery 111 of the stator punching sheet 1 is arranged to be composed of a plurality of arc edge segments 111b and a plurality of straight edge segments 111a alternatingly, so that the refrigerant can pass through the outside of the straight edge segment 111a.

[0038] Further, in one embodiment, see Figure 1 , the distance from the first notch 131a to the first groove bottom 131b is greater than the distance from the second notch 132a to the second groove bottom 132b.

[0039] It should be noted that the distance from the first slot 131a to the first slot bottom 131b is the slot depth of the first stator slot 131, and the distance from the second slot 132a to the second slot bottom 132b is the slot depth of the second stator slot 132. Therefore, by setting the slot depth of the first stator slot 131 and the slot depth of the second stator slot 132 to be different, the area of ​​the first stator slot 131 is made larger than the area of ​​the second stator slot 132, and the number of turns of the winding is adjusted by adjusting the area of ​​the stator slot 131, thereby improving the working efficiency of the motor.

[0040] In one embodiment, see Figure 2 , L1 satisfies 60mm≤L1≤200mm.

[0041] Specifically, by limiting the minimum value of L1 to 60 mm, the motor can be ensured to have a certain structural compactness, avoid the motor being too large, and help save space and cost. And L1 cannot be too large, so as to ensure the operating reliability of the motor. The reasonable range of L1 helps to optimize the electromagnetic performance of the motor and ensure that the motor has a stable electromagnetic distribution and high efficiency during operation.

[0042] In one embodiment, please continue to refer to Figure 2 Two of the plurality of straight edge segments 111 a are separated by at least one arc edge segment 111 b, and the two straight edge segments 111 a are arranged opposite to each other in the radial direction of the stator sheet 1 .

[0043] Specifically, there are four straight edge segments 111a and four arc edge segments 111b in the stator sheet 1, wherein the four straight edge segments 111a and the four arc edge segments 111b are arranged alternately, wherein the four straight edge segments 111a are divided into two groups, and two straight edge segments 111a in any group of straight edge segments 111a are arranged opposite to each other in the radial direction of the stator sheet 1. Therefore, L1 is the distance between two straight edge segments 111a in any group of straight edge segments 111a.

[0044] In one embodiment, see Figure 2 , D3 satisfies 30mm≤D3≤100mm.

[0045] Furthermore, limiting the range of D3 helps ensure the structural stability of the motor and avoid vibration and noise caused by structural instability during operation. Furthermore, limiting D3 can make it possible to use materials more reasonably, avoid waste and overuse of materials, and help reduce costs.

[0046] In one embodiment, see Figure 1 , two of the plurality of first stator slots 131 are separated by at least one of the second stator slots 132, and the two first stator slots 131 are arranged opposite to each other in the radial direction of the stator sheet 1; two of the plurality of second stator slots 132 are separated by at least one of the first stator slots 131, and the two second stator slots 132 are arranged opposite to each other in the radial direction of the stator sheet 1. The above design can optimize the distribution of the winding in the stator slot 13, reduce the non-uniformity of the current density, and thus reduce the energy loss and the winding temperature.

[0047] The present invention also proposes a motor, which includes a stator punching sheet 1. The specific structure of the stator punching sheet 1 refers to the above embodiment. Since this motor adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, which will not be described one by one here.

[0048] The present invention also proposes a compressor, which includes a motor. The specific structure of the motor refers to the above-mentioned embodiment. Since the compressor adopts all the technical solutions of all the above-mentioned embodiments, it has at least all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be described one by one here.

[0049] The above description is only an exemplary embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the technical concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A stator punching sheet, characterized in that: include: yoke; A plurality of teeth portions are arranged at intervals on the inner periphery of the yoke portion, a stator slot is formed between two adjacent teeth portions, the plurality of stator slots include a plurality of first stator slots and a plurality of second stator slots, the area of ​​the first stator slots is greater than the area of ​​the second stator slots, the first stator slots have a first slot opening and a first slot bottom opposite to the first slot opening, and the second stator slots have a second slot opening and a second slot bottom opposite to the second slot opening; Wherein, twice the distance from the bottom of the first slot to the center of the stator punching sheet is D1, twice the distance from the bottom of the second slot to the center of the stator punching sheet is D2, the slot width of the stator slot is W, the inner diameter of the tooth portion 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 punching sheet has a first surface, the area of ​​the first surface is S2, and 0.4≤S1 / S2≤0.

6.

2. The stator sheet according to claim 1, characterized in that: The slot width of the stator slot gradually increases from the slot opening of the stator slot to the slot bottom of the stator slot, and the slot width from the center of the stator punching sheet to the position of (D1+D3) / 2 of the stator slot is W.

3. The stator sheet according to claim 1, characterized in that: The outer periphery of the yoke includes a plurality of arc edge segments and a plurality of straight edge segments, the outer diameter of the arc edge segment is L1, twice the distance from the center of the stator punching sheet to the straight edge segment is L2, and L1, L2, D1 and D2 satisfy 0.95≤(D1-D2) / (L1-L2)≤1.

05.

4. The stator sheet according to claim 3, characterized in that: The distance from the first notch to the first groove bottom is greater than the distance from the second notch to the second groove bottom.

5. The stator sheet according to claim 3, characterized in that: The L1 satisfies 60mm≤L1≤200mm.

6. The stator sheet according to claim 3, characterized in that: 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 to each other in the radial direction of the stator punching sheet.

7. The stator sheet according to claim 1, characterized in that: The D3 satisfies 30mm≤D3≤100mm.

8. The stator sheet according to claim 1, characterized in that: Two of the plurality of first stator slots are separated by at least one of the second stator slots, and the two first stator slots are arranged opposite to each other in the radial direction of the stator punching sheet; two of the plurality of second stator slots are separated by at least one of the first stator slots, and the two second stator slots are arranged opposite to each other in the radial direction of the stator punching sheet.

9. A motor, characterized in that: Comprising a stator punching sheet as described in any one of claims 1 to 8.

10. A compressor, characterized in that: Comprising the motor as claimed in claim 9.

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