Stator core, motor and scroll compressor

Abstract

The invention provides a stator core, a motor and a scroll compressor, and relates to the field of scroll compressor design and manufacturing. The stator core comprises a stator yoke on the outer side and stator teeth and stator grooves which are uniformly distributed on the inner side, the outer contour of the stator yoke is composed of straight line sections which are uniformly distributed, first arc sections which are close to the outer side and second arc sections which are close to the inner side, the number of the stator teeth and the number of the stator grooves are equal and are Q, Q is larger than or equal to 24 and smaller than or equal to 36, Q is an even number which can be exactly divided by 3, and Q is larger than or equal to 24 and smaller than or equal to 36. Insulation paper and a circular enameled wire are placed in a stator groove, the conductive material of the circular enameled wire is copper or aluminum or copper-clad aluminum, the included angle alpha of a straight line section, the radius R1 of a first arc section, the radius R2 of a second arc section and the central angle beta of a second arc meet the condition that 3.246 < = 3.701, R1 is larger than or equal to 75 mm and smaller than or equal to 95 mm, and winding temperature rise can be reduced, efficiency can be improved, and noise can be reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of compressor design and manufacturing, in particular, relates to a stator core, a motor and a scroll compressor. BACKGROUND

[0002] In order to ensure the oil discharge amount and facilitate the circulation of refrigerant, the outer side of the stator core in the scroll compressor is often hollowed out, but improper processing will have the following effects:

[0003] (1) affecting the magnetic circuit distribution and the magnetic density in the core, thereby affecting the electromagnetic performance and reducing the efficiency; (2) improper hollowing area will affect the heat dissipation of the motor, resulting in increased temperature rise and reduced efficiency; (3) hollowing will change the modal of the stator core, thereby affecting the vibration and noise; (4) too small contact area between the stator core and the compressor shell will affect the interference amount, and in severe cases, the stator core will be axially misaligned, thereby affecting the use of the compressor.

[0004] The present application aims to provide a stator core to improve the above-mentioned adverse effects. SUMMARY

[0005] According to the above, in order to ensure the oil discharge amount and facilitate the circulation of refrigerant, the stator core of the motor is hollowed out, which leads to reduced electromagnetic performance, increased temperature rise, reduced efficiency, and increased noise, and a stator core, a motor and a scroll compressor are provided. The present application can increase the circulation area, reduce the temperature rise and increase the efficiency without affecting the electromagnetic performance.

[0006] The technical means adopted by the present application are as follows: A stator core, comprising an outer stator yoke and an inner stator tooth and stator slot; The outer contour of the stator yoke is composed of evenly distributed straight line segments, a first circular arc segment on the outer side and a second circular arc segment on the inner side; The number of stator teeth and stator slots is equal, both Q, satisfying: 24≤Q≤36, and Q is an even number divisible by 3; The stator slot contains insulating paper and circular enameled wire, and the conductive material of the circular enameled wire is copper or aluminum or copper-clad aluminum; The included angle of the straight line segment is α, the radius of the first circular arc segment is R1, the radius of the second circular arc segment is R2, and the central angle of the second circular arc segment is β, satisfying: 3.246≤ ≤3.701, wherein: 75mm≤R1≤95mm.

[0007] Furthermore, the included angle α of the straight line segment and the central angle β of the second circular arc segment satisfy: 360° / Q<β<α / 3.

[0008] Furthermore, the circumscribed circle radius of the stator slot bottom is R3, and the inner radius of the stator core is R4, satisfying: 1.02≤(R2-R3) / (R3-R4)≤1.15.

[0009] Furthermore, let , Then 3.272 < / <3.788; Let Then 0.268 < / <0.339.

[0010] Furthermore, the centers of the first and second arc segments are both located at the center of the stator core; the central angles of the first and second arc segments are equal.

[0011] Furthermore, a first chamfer and a second chamfer are provided at the junction of the first arc segment and the second arc segment, wherein the radius of the first chamfer is Rd1 and the radius of the second chamfer is Rd2; The first chamfer radius Rd1 and the second chamfer radius Rd2 satisfy the following condition: 0.05mm≤Rd1<Rd2≤(R1-R2) / 2.

[0012] Furthermore, the stator teeth have a parallel structure; The stator tooth width wt satisfies: 3.2mm≤wt<R1-R2≤5mm.

[0013] Furthermore, the stator tooth width also satisfies: 0.16≤wt / (R2-R3)≤0.24.

[0014] The present invention also provides an electric motor that uses the aforementioned stator core.

[0015] In addition, the present invention also provides a scroll compressor, including the aforementioned motor.

[0016] Compared with the prior art, the present invention has the following advantages: 1. Under the premise of a limited number of stator slots, i.e., the number of stator slots Q satisfies: 24 ≤ Q ≤ 36, and Q is an even number divisible by 3, such that the included angle α of the straight segment, the radius R1 of the first circular arc segment, the radius R2 of the second circular arc segment, and the central angle β of the second circular arc segment satisfy 3.246 ≤ ≤3.701, where 75mm≤R1≤95mm, and the included angle α of the straight segment and the central angle β of the second arc segment satisfy 360° / Q<β<α / 3, which can reduce noise and increase efficiency.

[0017] 2. Ensure that the radius R3 of the circumscribed circle at the bottom of the stator slot and the inner radius R4 of the stator core satisfy 1.02≤(R2-R3) / (R3-R4)≤1.15, and ensure that the stator tooth width wt satisfies 3.2mm≤wt<R1-R2≤5mm and 0.16≤wt / (R2-R3)≤0.24. This can change the magnetic field distribution, improve the electromagnetic performance of the motor, and further reduce the motor efficiency. 3. Order , Then 3.272 < / <3.788; Let By ensuring 0.268 < / A value <0.339 can increase the flow area, reduce the temperature rise, and increase efficiency without affecting electromagnetic performance. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention 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 some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the stator core structure of the present invention.

[0020] Figure 2 for Figure 1 A magnified view of part A in the image.

[0021] Figure 3 This is a diagram showing the operating range of the stator core compressor using the present invention.

[0022] Figure 4 This is a temperature comparison chart of the stator core using the present invention and the conductive materials of existing technologies.

[0023] Figure 5 This is a comparison chart showing the efficiency of the stator core using the present invention compared to existing technologies.

[0024] Figure 6 This is a comparison chart of the average noise levels of the stator core using the present invention and existing technologies.

[0025] In the diagram: 1. Stator core; 11. Stator yoke; 111. Straight segment; 112. First circular arc segment; 113. Second circular arc segment; 114. First chamfer; 115. Second chamfer; 12. Stator tooth; 13. Stator slot. Detailed Implementation

[0026] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0027] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present invention or its application or use. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0028] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of exemplary embodiments according to the invention. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0029] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of the invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following figures denote similar items; therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0030] like Figure 1 and Figure 2As shown, the present invention provides a stator core 1, which includes an outer stator yoke 11 and inner stator teeth 12 and stator slots 13 evenly distributed. The outer contour of the stator yoke 11 is composed of evenly distributed straight line segments 111, an outermost first circular arc segment 112, and an innermost second circular arc segment 113. The number of stator teeth 12 and stator slots 13 is equal, both being Q, satisfying: 24≤Q≤36, and Q is an even number divisible by 3. Insulating paper and circular enameled wire are placed in the stator slots 13, and the conductive material of the circular enameled wire is copper, aluminum, or copper-clad aluminum. The included angle α of the straight line segment 111, the radius R1 of the first circular arc segment 112, the radius R2 of the second circular arc segment 113, and the central angle β of the second circular arc segment 113 satisfy: 3.246≤ ≤3.701, where: 75mm≤R1≤95mm.

[0031] By implementing the above limitations, stator stiffness can be improved, compressor noise can be reduced, and motor efficiency can be increased.

[0032] Preferably, to ensure a reasonable distribution of the motor's magnetic circuit and uniform magnetic flux density, the included angle α of the straight segment 111 and the central angle β of the second circular arc segment 113 satisfy: 360° / Q<β<α / 3.

[0033] Preferably, the circumscribed circle radius of the stator slot 13 is R3, and the inner radius of the stator core 1 is R4, satisfying: 1.02≤(R2-R3) / (R3-R4)≤1.15. This ensures a reasonable ratio between the depth of the stator slot 13 and the thickness of the stator yoke 11, balancing the magnetic and thermal loads.

[0034] Preferably, let , Then 3.272 < / <3.788; Let Then 0.268 < / With a value <0.339, the refrigerant flow area can be increased, heat dissipation can be improved, motor temperature rise can be reduced, and efficiency can be further increased without affecting electromagnetic performance.

[0035] Preferably, in order to reduce mold costs and avoid axial misalignment of the stator core 1 in the compressor housing, thereby causing compressor operation accidents, the centers of the first arc segment 112 and the second arc segment 113 are both located at the center of the stator core 1. In addition, the central angles of the first arc segment 112 and the second arc segment 113 are equal.

[0036] Preferably, a first chamfer 114 and a second chamfer 115 are provided at the junction of the first arc segment 112 and the second arc segment 113. The radius of the first chamfer 114 is Rd1 and the radius of the second chamfer 115 is Rd2, which satisfy: 0.05mm≤Rd1<Rd2≤(R1-R2) / 2.

[0037] Preferably, the stator teeth 12 have a parallel structure, and the width wt of the stator teeth 12 satisfies: 3.2mm ≤ wt < R1-R2 ≤ 5mm. The width of the stator teeth 12 also satisfies: 0.16 ≤ wt / (R2-R3) ≤ 0.24. This ensures a certain slot area and improves efficiency.

[0038] Some parameters in this embodiment are shown in the table below:

[0039] It should be noted that "prior art" as used below refers to technology that does not meet any one or more of the limitations in the table above.

[0040] Taking a scroll compressor with a rated voltage of 380V, a frequency of 50Hz, a refrigerant of R404A, and a displacement of 84CC as an example, the relevant explanation is given. The conductive material embedded in the stator slot 13 of the stator core 1 is aluminum. Figure 3 The compressor's operating range diagram is provided, showing four typical operating conditions: one standard operating condition and three extreme operating conditions. The corresponding evaporation and condensation temperatures for each operating condition are shown in the table below:

[0041] like Figure 4 The figure shows a comparison of the temperature of the conductive material under the four operating conditions described above, using the stator core of the present invention and the prior art.

[0042] Depend on Figure 4 It can be seen that the temperature of the conductive material in the stator slot 13 under the four operating conditions using the stator core of the present invention is lower than that of the prior art, which can produce less conductor loss. This proves that the present invention can reduce the temperature rise of the motor, reduce losses, and thus increase efficiency.

[0043] like Figure 5 The figure shows a comparison of motor efficiency under standard operating conditions between the stator core of the present invention and the prior art. As can be seen from the figure, the stator core of the present invention has a significant improvement in efficiency compared with the prior art.

[0044] like Figure 6 The figure shows the average noise levels of a compressor under standard operating conditions using the stator core of this invention and the prior art. As can be seen from the figure, the average noise level using the stator core of this invention is lower than that of the prior art, proving that this invention can effectively improve compressor vibration and noise.

[0045] The present invention also provides an electric motor that uses the stator core 1 described above.

[0046] In addition, the present invention also provides a scroll compressor that uses the above-mentioned motor, wherein the motor and other structures and operations of the scroll compressor are known to those skilled in the art and will not be described in detail.

[0047] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A stator core characterized by, The stator yoke includes an outer side and an inner side, and the stator teeth and the stator slots are uniformly distributed; The outer contour of the stator yoke is composed of uniformly distributed straight line segments, an outer first circular arc segment and an inner second circular arc segment; The number of the stator teeth and the number of the stator slots are equal, both being Q, and satisfying 24≤Q≤36, and Q is an even number divisible by 3; The stator slots contain insulating paper and circular enameled wire, and the conductive material of the circular enameled wire is copper or aluminum or copper-clad aluminum; The straight line segment angle is α, the first circular arc segment radius is R1, the second circular arc segment radius is R2, and the second circular arc segment central angle is β, and the following is satisfied: 3.246≤ ≤3.701, wherein: 75mm≤R1≤95mm.

2. The stator core according to claim 1, characterized by The included angle of the straight line segment and the central angle of the second circular arc segment satisfy 360° / Q<β<α / 3.

3. The stator core of claim 1, characterized by The radius of the circumscribed circle of the bottom of the stator slot is R3, and the inner radius of the stator core is R4, and they satisfy 1.02≤(R2-R3) / (R3-R4)≤1.

15.

4. The stator core of claim 3, characterized by Let , ; then 3.272 < x < 3.788 / < 3.788; let ; then 0.268 < x < 0.339 / < 0.

339.

5. The stator core of claim 1, characterized by The centers of the first circular arc segment and the second circular arc segment are both in the center of the stator core, and the central angles of the first circular arc segment and the second circular arc segment are equal.

6. The stator core of claim 1, characterized by The first chamfer and the second chamfer are arranged at the joint of the first circular arc segment and the second circular arc segment, and the radius of the first chamfer is Rd1, and the radius of the second chamfer is Rd2; The first chamfer radius Rd1 and the second chamfer radius Rd2 satisfy 0.05mm≤Rd1<Rd2≤(R1-R2) / 2.

7. The stator core of claim 3, characterized by The stator teeth are parallel structures; The stator tooth width wt satisfies 3.2mm≤wt<R1-R2≤5mm.

8. The stator core of claim 7, characterized by The stator tooth width wt also satisfies 0.16≤wt / (R2-R3)≤0.

24.

9. An electric machine characterized by The motor comprises the stator core as claimed in any one of claims 1-8.

10. A scroll compressor characterized by, The motor comprises the stator core as claimed in claim 9.

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