Auxiliary slot stator punching sheet, stator assembly, motor, compressor

Abstract

An auxiliary slot stator punching sheet, a stator assembly, a motor, and a compressor relate to the technical field of motors. The auxiliary slot stator punching sheet comprises a stator punching sheet, and an auxiliary slot is provided at the slot shoulder of the stator punching sheet. The present invention reduces the motor tooth slot torque and torque pulsation by providing an auxiliary slot at the slot shoulder of the stator punching sheet, reduces the tangential vibration of the motor, optimizes the sinusoidality of the motor air gap magnetic density, reduces the harmonics of the air gap magnetic density, further reduces the radial vibration of the motor, reduces the overall vibration of the motor, and thus reduces the vibration noise.

Description

Technical Field

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

[0002] Most of the existing variable frequency air conditioner motors use fractional slots, which have relatively high performance, but relatively worse noise and vibration. The torque pulsation and cogging torque are significantly increased, causing the compressor to increase the tangential vibration caused by torque pulsation to varying degrees.

[0003] In this regard, the Chinese invention "A stator punching sheet and a rotating electric machine" with application number CN201820821757.0 discloses a stator punching sheet, comprising: a plurality of stacked stator punching sheets, the stator punching sheets comprising a plurality of stator teeth distributed along the circumferential direction, two adjacent stator teeth surrounding a stator slot, the stator teeth radially comprising a tooth portion and a tooth shoe portion in sequence from the outside to the inside, a plurality of tooth shoe portions surrounding a central hole of the stator punching sheet, the gap between two adjacent tooth shoe portions defining the corresponding notch of the stator slot, wherein the plurality of stacked stator punching sheets comprises at least two first stator punching sheets and at least two second stator punching sheets, and an auxiliary groove is provided on the inner wall of at least one tooth shoe portion on the first stator punching sheet. Although the invention can reduce torque pulsation by providing an auxiliary groove on the inner wall of the stator punching sheet, this method alone has little effect on improving the motor, and has a greater impact on the air gap, resulting in a greater loss of energy efficiency. Summary of the invention

[0004] One of the purposes of the present invention is to avoid the deficiencies in the prior art and provide an auxiliary slot stator punching sheet, which effectively reduces the motor tooth slot torque and torque pulsation, reduces the motor tangential vibration, and at the same time optimizes the motor air gap magnetic density sinusoidality, reduces the air gap magnetic density harmonics, further reduces the radial vibration of the motor, reduces the overall vibration of the motor, and thus reduces vibration noise.

[0005] The purpose of the present invention is achieved through the following technical solutions:

[0006] Provided is an auxiliary slot stator punching sheet, comprising a stator punching sheet, wherein at least one auxiliary slot is provided at the slot shoulder of the stator punching sheet. By providing the auxiliary slot at the slot shoulder of the stator punching sheet, the motor tooth slot torque and torque pulsation are reduced, the motor tangential vibration is reduced, and at the same time, the motor air gap magnetic density sinusoidality is optimized, the air gap magnetic density harmonic is reduced, the radial vibration of the motor is further reduced, the overall vibration of the motor is reduced, and thus the vibration noise is reduced.

[0007] Furthermore, the auxiliary slot is provided on one side or both sides of the slot shoulder of the stator punching sheet. When the auxiliary slot is provided on one side or both sides of the slot shoulder of the stator punching sheet, the motor cogging torque and torque pulsation can be reduced, while optimizing the sinusoidality of the motor air gap magnetic density and reducing the air gap magnetic density harmonics.

[0008] Furthermore, one auxiliary slot is provided on one or both sides of the slot shoulder of the stator punching sheet, the width of the auxiliary slot is b1, the depth of the auxiliary slot is d1, the distance between one side of the auxiliary slot and the bottom of the slot shoulder of the stator punching sheet is c1, the spacing between adjacent slots of the stator punching sheet is a, the distance between the bottom of the slot shoulder of the stator punching sheet and the center of the stator punching sheet is R, wherein c1≥0.007*R, c1≥b1, d1<0.1*a. When an auxiliary slot is provided, when the auxiliary slot satisfies the above relationship, the effect of reducing the motor tooth slot torque and torque pulsation, optimizing the motor air gap magnetic flux sinusoidality, and reducing the air gap magnetic flux harmonics is relatively good.

[0009] Furthermore, d1=0.057*a, c1=b1=0.019*R. More specifically, when the above relationship is satisfied, when an auxiliary slot is opened, the motor cogging torque and torque pulsation are reduced, the motor air gap flux sinusoidality is optimized, and the air gap flux harmonics are reduced.

[0010] Further, two auxiliary slots are respectively provided on one side or both sides of the slot shoulder of the stator punching sheet, which are the first auxiliary slot and the second auxiliary slot, respectively. The width of the first auxiliary slot is b2, the depth of the first auxiliary slot is d2, and the distance between one side of the first auxiliary slot and the bottom of the slot shoulder of the stator punching sheet is c2; the width of the second auxiliary slot is b3, the depth of the second auxiliary slot is d3, the spacing between adjacent slots of the stator punching sheet is a, and the distance between the bottom of the slot shoulder of the stator punching sheet and the center of the stator punching sheet is R, wherein c2≥0.007*R, c2≥b2, c2≥b3, d2<0.1*a, d3<0.05*a. When two auxiliary slots are provided, when the auxiliary slots satisfy the above relationship, the effect of reducing the motor cogging torque and torque pulsation, optimizing the motor air gap magnetic flux sinusoidality, and reducing the air gap magnetic flux harmonics is relatively good.

[0011] Furthermore, d3=2*d2=0.034*a, c2=b2=b3=0.0113*R. More specifically, when the above relationship is satisfied and two auxiliary slots are opened, the motor cogging torque and torque pulsation are reduced, the motor air gap magnetic flux sinusoidality is optimized, and the air gap magnetic flux harmonics are reduced.

[0012] Furthermore, the first auxiliary slot is closer to the bottom of the slot shoulder of the stator sheet than the second auxiliary slot. At the same time, when the above relationship is satisfied, when two auxiliary slots are provided, the motor cogging torque and torque pulsation are reduced, the sinusoidality of the motor air gap magnetic flux density is optimized, and the effect of reducing the harmonics of the air gap magnetic flux density is optimal.

[0013] Beneficial effects of the present invention: An auxiliary slot stator punching of the present invention comprises a stator punching, wherein an auxiliary slot is provided at the slot shoulder of the stator punching. The present invention reduces the motor tooth slot torque and torque pulsation by providing the auxiliary slot at the slot shoulder of the stator punching, thereby reducing the motor tangential vibration, and at the same time optimizes the motor air gap magnetic density sinusoidality, reduces the air gap magnetic density harmonics, further reduces the radial vibration of the motor, reduces the overall vibration of the motor, and thus reduces vibration noise.

[0014] The second object of the present invention is to avoid the deficiencies in the prior art and provide a stator assembly, which uses the above-mentioned auxiliary slot stator punching. Since the auxiliary slots are opened at the slot shoulders of the stator punching, the motor tooth torque and torque pulsation are reduced, the motor tangential vibration is reduced, and at the same time, the sinusoidality of the motor air gap magnetic density is optimized, the air gap magnetic density harmonics are reduced, and the radial vibration of the motor is further reduced, so that the overall vibration of the motor is reduced, thereby reducing vibration noise.

[0015] The third object of the present invention is to avoid the deficiencies in the prior art and provide a motor, which uses the above-mentioned stator assembly. Since auxiliary slots are opened at the slot shoulders of the stator punching sheets of the stator assembly, the motor tooth torque and torque pulsation are reduced, and the tangential vibration of the motor is reduced. At the same time, the sinusoidality of the motor air gap magnetic density is optimized, the air gap magnetic density harmonics are reduced, and the radial vibration of the motor is further reduced, so that the overall vibration of the motor is reduced, thereby reducing vibration noise.

[0016] The fourth object of the present invention is to avoid the deficiencies in the prior art and provide a compressor, which uses the above-mentioned motor. Since an auxiliary slot is opened at the slot shoulder of the stator punching sheet of the stator assembly, the motor tooth slot torque and torque pulsation are reduced, the motor tangential vibration is reduced, and at the same time, the sinusoidality of the motor air gap magnetic density is optimized, the air gap magnetic density harmonics are reduced, and the radial vibration of the motor is further reduced, so that the overall vibration of the motor is reduced, thereby reducing vibration noise. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The invention is further described using the accompanying drawings, but the embodiments in the accompanying drawings do not constitute any limitation to the invention. A person skilled in the art can obtain other drawings based on the following drawings without creative work.

[0018] Figure 1 It is a schematic diagram of the overall structure of an auxiliary slot stator punching sheet according to Example 1 of the present invention.

[0019] Figure 2 yes Figure 1 Enlarged view of part A in the figure.

[0020] Figure 3 It is a schematic diagram of the overall structure of an auxiliary slot stator punching sheet according to Example 2 of the present invention.

[0021] Figure 4 yes Figure 3 Enlarged view of area B.

[0022] Figure 5 It is the stator punching sheet described in the background technology.

[0023] Figure 6 It is the test result data table in the experimental example.

[0024] Figure 7 It is the waveform diagram of the test results in the experimental example.

[0025] Included in the picture are:

[0026] Stator punching sheet 1, auxiliary slot 2, first auxiliary slot 3, second auxiliary slot 4. DETAILED DESCRIPTION

[0027] The present invention is further described in conjunction with the following examples.

[0028] Example 1

[0029] An auxiliary slot stator punching sheet of this embodiment, such as Figure 1-2 As shown, it includes a stator punching sheet 1, and an auxiliary slot 2 is respectively opened on both sides of the slot shoulder of the stator punching sheet 1. By opening the auxiliary slot 2 at the slot shoulder of the stator punching sheet 1, the motor cogging torque and torque pulsation are reduced, the tangential vibration of the motor is reduced, and at the same time, the sinusoidality of the motor air gap magnetic density is optimized, the air gap magnetic density harmonics are reduced, and the radial vibration of the motor is further reduced, so that the overall vibration of the motor is reduced, thereby reducing vibration noise.

[0030] The width of the auxiliary slot 2 is b1, the depth of the auxiliary slot 2 is d1, the distance between one side of the auxiliary slot 2 and the bottom of the slot shoulder of the stator punching sheet 1 is c1, the spacing between adjacent slots of the stator punching sheet 1 is a, and the distance between the bottom of the slot shoulder of the stator punching sheet 1 and the center of the stator punching sheet 1 is R, wherein c1≥0.007*R, c1≥b1, d1<0.1*a. When an auxiliary slot 2 is opened, when the auxiliary slot 2 satisfies the above relationship, the effect of reducing the motor tooth slot torque and torque pulsation, optimizing the motor air gap magnetic flux sinusoidality, and reducing the air gap magnetic flux harmonics is relatively good.

[0031] More specifically, when the relationship d1=0.057*a, c1=b1=0.019*R is satisfied, when an auxiliary slot 2 is opened, the motor cogging torque and torque pulsation are reduced, the sinusoidality of the motor air gap flux density is optimized, and the effect of reducing the air gap flux density harmonics is best.

[0032] Example 2

[0033] like Figure 3-4 As shown, the other structures of this embodiment are the same as those of the embodiment 1, except that two auxiliary slots 2 are respectively provided on both sides of the slot shoulder of the stator punching sheet 1, namely the first auxiliary slot 3 and the second auxiliary slot 4, the width of the first auxiliary slot 3 is b2, the depth of the first auxiliary slot 3 is d2, and the distance between one side of the first auxiliary slot 3 and the bottom of the slot shoulder of the stator punching sheet 1 is c2; the width of the second auxiliary slot 4 is b3, the depth of the second auxiliary slot 4 is d3, the spacing between adjacent slots of the stator punching sheet 1 is a, and the distance between the bottom of the slot shoulder of the stator punching sheet 1 and the center of the stator punching sheet 1 is R, wherein c2≥0.007*R, c2≥b2, c2≥b3, d2<0.1*a, d3<0.05*a. When two auxiliary slots 2 are provided, when the auxiliary slots 2 satisfy the above relationship, the effect of reducing the motor cogging torque and torque pulsation, optimizing the motor air gap magnetic flux sinusoidality, and reducing the air gap magnetic flux harmonics is relatively good.

[0034] More specifically, when two auxiliary slots 2 are opened under the condition that d3=2*d2=0.034*a, c2=b2=b3=0.0113*R, the motor cogging torque and torque pulsation are reduced, the sinusoidality of the motor air gap flux density is optimized, and the effect of reducing the air gap flux density harmonics is better.

[0035] At the same time, under the condition that the first auxiliary slot 3 is closer to the bottom of the slot shoulder of the stator punching sheet 1 than the second auxiliary slot 4, when two auxiliary slots 2 are opened, the motor tooth torque and torque pulsation are reduced, the sinusoidality of the motor air gap magnetic density is optimized, and the effect of reducing the air gap magnetic density harmonics is best.

[0036] Example 3

[0037] The other structures of this embodiment are the same as those of the embodiment 1, except that the auxiliary slot 2 is provided on one side of the slot shoulder of the stator punching sheet 1. The auxiliary slot 2 is provided on one side of the slot shoulder of the stator punching sheet 1, which can reduce the motor cogging torque and torque pulsation, optimize the motor air gap magnetic flux sinusoidality, and reduce the air gap magnetic flux harmonics.

[0038] Example 4

[0039] The other structures of this embodiment are the same as those of the embodiment 2, except that the auxiliary slot 2 is provided on one side of the slot shoulder of the stator punching sheet 1. The auxiliary slot 2 is provided on one side of the slot shoulder of the stator punching sheet 1, which can reduce the motor cogging torque and torque pulsation, optimize the motor air gap magnetic flux sinusoidality, and reduce the air gap magnetic flux harmonics.

[0040] Example 5

[0041] The other structures of this embodiment are the same as those of the embodiment 1, except that one or two auxiliary slots 2 are respectively provided on both sides of the slot shoulder of the stator punching sheet 1. Providing one auxiliary slot 2 on one side of the slot shoulder of the stator punching sheet 1 and two auxiliary slots 2 on the other side can reduce the motor cogging torque and torque pulsation, optimize the sinusoidality of the motor air gap magnetic density, and reduce the air gap magnetic density harmonics.

[0042] Example 6

[0043] The present embodiment provides a stator assembly, which uses the auxiliary slot stator punching sheet described in any one of embodiments 1 to 5. Since the auxiliary slot 2 is opened at the slot shoulder of the stator punching sheet 1, the motor tooth slot torque and torque pulsation are reduced, and the tangential vibration of the motor is reduced. At the same time, the sinusoidality of the motor air gap magnetic density is optimized, the air gap magnetic density harmonics are reduced, and the radial vibration of the motor is further reduced, so that the overall vibration of the motor is reduced, thereby reducing vibration noise.

[0044] Example 7

[0045] The present embodiment provides a motor, which uses the stator assembly described in Example 6. Since an auxiliary slot 2 is opened at the slot shoulder of the stator punching sheet 1 of the stator assembly, the motor tooth slot torque and torque pulsation are reduced, and the tangential vibration of the motor is reduced. At the same time, the sinusoidality of the motor air gap magnetic density is optimized, the air gap magnetic density harmonics are reduced, and the radial vibration of the motor is further reduced, so that the overall vibration of the motor is reduced, thereby reducing vibration noise.

[0046] Example 8

[0047] The present embodiment provides a compressor, which uses the motor described in Example 7. Since an auxiliary slot 2 is opened at the slot shoulder of the stator punching sheet 1 of the stator assembly, the motor tooth slot torque and torque pulsation are reduced, and the tangential vibration of the motor is reduced. At the same time, the sinusoidality of the motor air gap magnetic density is optimized, the air gap magnetic density harmonics are reduced, and the radial vibration of the motor is further reduced, so that the overall vibration of the motor is reduced, thereby reducing vibration noise.

[0048] Experimental example

[0049] In order to better illustrate the effect of the present invention, the present invention is directed to a stator punching sheet with a sharpened slot shoulder. The stator punching sheet disclosed in the background art is as follows: Figure 5As shown, the stator punching sheets described in Example 1 and the stator punching sheets described in Example 2 were subjected to performance tests, and were divided into four groups, namely, original scheme 1, original scheme 2, example 1 and example 2. The test results are shown in FIG. Figure 6-7 As shown, from Figure 6-7 It can be seen that although the original solution 2 can reduce the torque pulsation, this method alone has little effect on the improvement of the motor, and has a greater impact on the air gap, resulting in greater energy efficiency loss. At the same time, the fundamental wave of the air gap magnetic density of the original solution 2 is smaller, which means that the torque is smaller and the motor overload capacity is weakened.

[0050] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention, rather than to limit the scope of protection of the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the essence and scope of the technical solution of the present invention.

Claims

1. An auxiliary slot stator punching sheet, comprising a stator punching sheet, characterized in that: At least one auxiliary groove is provided at the slot shoulder of the stator punching sheet; one auxiliary groove is provided on opposite sides of the slot shoulder of the stator punching sheet, respectively, the width of the auxiliary groove is b1, the depth of the auxiliary groove is d1, the distance between one side of the auxiliary groove and the bottom of the slot shoulder of the stator punching sheet is c1, the spacing between adjacent slots of the stator punching sheet is a, and the distance between the bottom of the slot shoulder of the stator punching sheet and the center of the stator punching sheet is R, wherein c1≥0.007*R, c1≥b1, and d1<0.1*a.

2. The auxiliary slot stator punching sheet according to claim 1, characterized in that: d1=0.057*a, c1=b1=0.019*R.

3. An auxiliary slot stator punching sheet, comprising a stator punching sheet, characterized in that: Two auxiliary grooves are respectively provided on opposite sides of the slot shoulder of the stator punching sheet, which are the first auxiliary groove and the second auxiliary groove respectively. The width of the first auxiliary groove is b2, the depth of the first auxiliary groove is d2, and the distance between one side of the first auxiliary groove and the bottom of the slot shoulder of the stator punching sheet is c2; the width of the second auxiliary groove is b3, the depth of the second auxiliary groove is d3, the spacing between adjacent slots of the stator punching sheet is a, and the distance between the bottom of the slot shoulder of the stator punching sheet and the center of the stator punching sheet is R, wherein c2≥0.007*R, c2≥b2, c2≥b3, d2<0.1*a, d3<0.05*a.

4. The auxiliary slot stator punching sheet according to claim 3, characterized in that: d3=2*d2=0.034*a, c2=b2=b3=0.0113*R.

5. The auxiliary slot stator punching sheet according to claim 4, characterized in that: The first auxiliary slot is located at a smaller distance from the bottom of the slot shoulder of the stator sheet than the second auxiliary slot.

6. A stator assembly, characterized in that: The invention comprises the auxiliary slot stator punching sheet as claimed in any one of claims 1 to 5.

7. A motor, characterized in that: Includes the stator assembly as claimed in claim 6.

8. A compressor, characterized in that: Comprising the motor as claimed in claim 7.

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