Motor stator, motor and air-conditioning compressor

Abstract

The present invention relates to the technical field of motors, and in particular to a motor stator, a motor and an air-conditioning compressor, wherein the stator is provided with an axial hole for accommodating a rotor and a plurality of stator slots, wherein the stator slots are evenly distributed around the axial hole; the stator slots are provided with notches toward the axial hole, and in the axial direction of the stator, the stator slots have more than two width sections with different notch widths, and the magnetic lines of force of each width section have different directions, so that the torque waveform of each width section is different, and the torque waveform of the entire stator is formed by superimposing the torque waveforms corresponding to each width section, and there is a phase difference between different torque waveforms, and there is a phenomenon that peaks and troughs cancel each other out, thereby optimizing the motor torque waveform, weakening the torque pulsation of the motor without reducing the motor torque output, and reducing the motor vibration noise.

Description

Technical Field

[0001] The present invention relates to the technical field of motors, and in particular to a motor stator, a motor and an air-conditioning compressor. Background Art

[0002] Motors are an important part of modern society. They provide power for various equipment in production and life, and the power is transmitted to other devices in the form of torque.

[0003] The motor torque is generated by the interaction between the stator and rotor magnetic fields, showing a periodic change similar to a sine wave. The change of the stator slot affects the direction of the magnetic lines of force between the stator and the rotor, thereby affecting the torque pulsation waveform. Torque pulsation refers to the ratio of the peak-to-peak value of the torque generated by the motor to the average value. If the ratio is too large, the motor will have large vibration and noise, and the torque efficiency will be low. Summary of the invention

[0004] The object of the present invention is to provide a motor stator, a motor and an air-conditioning compressor, which can weaken the motor torque pulsation without reducing the torque output.

[0005] The embodiment of the present invention is achieved as follows:

[0006] A motor stator, the stator is provided with an axial hole for accommodating a rotor and a plurality of stator slots, the stator slots are evenly distributed around the axial hole;

[0007] The stator slot is provided with a slot opening toward the shaft hole, and in the axial direction of the stator, the stator slot has at least two width sections with different slot opening widths.

[0008] Furthermore, in an embodiment of the present invention, the slot widths between the plurality of stator slots corresponding to each of the width segments in the circumferential direction of the stator are the same or different.

[0009] Furthermore, in an embodiment of the present invention, in the axial direction of the stator, the widths of the stator slot openings between adjacent width segments are different.

[0010] Furthermore, in an embodiment of the present invention, each of the width segments is formed by stacking one, two or more stator punching sheets.

[0011] Furthermore, in an embodiment of the present invention, each of the width segments is provided with one, two or more.

[0012] Further, in one embodiment of the present invention, the stator comprises more than one stator core A and more than one stator core B, and the stator core A and the stator core B are axially stacked to form the stator;

[0013] In the axial direction of the stator, the widths of the stator slots corresponding to the stator core A and the stator core B are different.

[0014] Further, in one embodiment of the present invention, the stator core A includes more than one stator punching sheet A, and the stator core B includes more than one stator punching sheet B;

[0015] The slot width of the stator slots on the stator punching sheet A is different from the slot width of the stator slots on the stator punching sheet B.

[0016] Furthermore, in an embodiment of the present invention, the thickness of the stator punching sheet A is the same as the thickness of the stator punching sheet B.

[0017] Furthermore, in an embodiment of the present invention, the quantity ratio of the stator punching sheets A to the stator punching sheets B is 0.1:1 to 10:1.

[0018] Furthermore, in one embodiment of the present invention, Z is the number of stator slots, G is the air gap between the stator and the rotor, R is the diameter of the shaft hole, W is the width of any width segment of the stator slot opening, and 0.2<W / G<2*π*R / Z*0.75.

[0019] A motor comprises the above-mentioned stator.

[0020] An air-conditioning compressor comprises the above-mentioned motor.

[0021] The beneficial effects of the embodiments of the present invention are:

[0022] The stator slot has more than two width segments with different slot widths. The magnetic lines of force corresponding to each width segment have different directions, so that the torque waveform of each width segment is different. The torque waveform of the entire stator is formed by the superposition of the torque waveforms corresponding to each width segment. There is a phase difference between different torque waveforms, and the peaks and troughs offset each other, which optimizes the motor torque waveform. Without reducing the motor torque output, the torque pulsation of the motor is weakened and the motor vibration noise is reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0024] Figure 1 This is a schematic diagram of the partial structure of a stator punching sheet A according to an embodiment of the present invention;

[0025] Figure 2 It is a schematic diagram of the partial structure of the stator punching sheet B according to an embodiment of the present invention;

[0026] Figure 3 This is a schematic diagram of the direction of local magnetic lines of force of stator punching A according to an embodiment of the present invention;

[0027] Figure 4 This is a schematic diagram of the direction of local magnetic lines of force of stator punching sheet B according to an embodiment of the present invention;

[0028] Figure 5 This is a schematic diagram of stator torque comparison in an embodiment of the present invention;

[0029] Figure 6 Schematic diagram of the relationship between the W1 / W2 ratio and the torque and torque ripple in an embodiment of the present invention;

[0030] Figure 7 This is a partial enlarged view of a stator punching sheet according to an embodiment of the present invention;

[0031] Figure 8 This is a schematic diagram of the stator structure of an embodiment of the present invention;

[0032] Fig. 9 Another structural schematic diagram of the stator according to an embodiment of the present invention;

[0033] Fig.10 It is another structural schematic diagram of an embodiment of the present invention;

[0034] Fig.11 Schematic diagram of the relationship between the W / G ratio, torque and torque ripple according to an embodiment of the present invention.

[0035] Icons: 1-statator core A; 11-statator punching sheet A; 12-statator slot A; 13-magnetic lines of force; 2-statator core B; 21-statator punching sheet B; 22-statator slot B; 23-magnetic lines of force; 3-statator core C; 4-magnetic lines of force; 5-rotor, 6-statator core D; 7-statator core E; 8-statator core F; 9-statator core H; 10-statator core M. DETAILED DESCRIPTION

[0036] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0037] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. 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.

[0038] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0039] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, or the positions or positional relationships in which the product of the invention is usually placed when in use. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0040] In addition, the terms "horizontal", "vertical" and the like do not mean that the components are required to be absolutely horizontal or suspended, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0041] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0042] Embodiment 1:

[0043] refer to Figure 3 -11. This embodiment provides a motor stator, a motor and an air-conditioning compressor. An axial hole and a plurality of stator slots are opened in the axial direction of the stator. The stator slots are evenly distributed around the axial hole. The stator slots have notches. The notches of the stator slots face the axial hole. The axial hole is used to match the rotor 5.

[0044] In the axial direction of the stator, the stator slot has more than two width segments with different slot widths. The magnetic lines of force formed by the slots in different width segments have different alignments, and the corresponding torque waveforms are also different. The torque waveform of the entire stator is formed by the superposition of the corresponding waveforms of each width segment. There is a phase difference between different torque waveforms, and the peaks and troughs offset each other, which optimizes the motor torque waveform. Without reducing the motor torque output, the motor torque pulsation is weakened and the motor vibration noise is reduced.

[0045] The slot widths of the multiple stator slots in the circumferential direction corresponding to each width segment are the same or different. In the axial direction of the stator, the slot widths of the stator slots between adjacent width segments are different. The stator is formed by stacking stator punching sheets. Each width segment can include one stator punching sheet, two stator punching sheets, or multiple stator punching sheets. Each width segment can be provided with one, two, or more. The ratios between the stator punching sheets between each width segment can be arbitrarily combined and matched, which can achieve the effect of optimizing the motor torque pulsation and reducing the motor vibration noise.

[0046] This embodiment also provides a motor, including the above-mentioned stator, and the rotor 5 is sleeved in the stator shaft hole.

[0047] This embodiment also provides an air-conditioning compressor, comprising the above-mentioned motor.

[0048] Example 2

[0049] Combination Figure 1 -2, reference Figure 5 , Figure 6 and Figure 7 This embodiment provides a motor stator, a motor and an air-conditioning compressor. The stator is provided with a stator slot and an axial hole for accommodating a rotor 5. The stator includes a stator punching sheet A11 and a stator punching sheet B21. The number of stator punching sheets A11 and the number of stator punching sheets B21 are 1:1. The stator punching sheets A11 and the stator punching sheets B21 are staggered and stacked.

[0050] The stator sheet A11 is provided with a stator slot A12, and the stator sheet B21 is provided with a stator slot B22. The stator sheet A11 and the stator sheet B21 have the same shape and structure except for the stator slot opening. The width of the stator slot A12 opening is W1, and the width of the stator slot B22 opening is W2. W1<W2, 2*π*R / Z*0.3<W1 / W2<2*π*R / Z*0.9, R is the stator inner diameter (shaft hole diameter), Z is the number of stator slots, and the combination Figure 6 As shown, when the ratio of W1 to W2 gradually decreases, the torque pulsation waveform and the torque waveform tend to be stable.

[0051] In this embodiment, the types of stator punching sheets can also be distinguished by the size of the stator slot openings. Each stator punching sheet is provided with multiple stator slots. The only difference between each type of punching sheet is that, in the axial direction of the stator, the width of the stator slot openings of each type of stator punching sheet is different. When the stator includes multiple types of stator punching sheets, W2 refers to the maximum slot width among all types of stator punching sheets, and W1 refers to the minimum slot width among all types of stator punching sheets.

[0052] Combination Figure 3 and Figure 4 As shown in FIG. 1 , the width of the stator slots is different, resulting in a change in the position of the magnetic field lines of the stator relative to the rotor 5. The motor torque waveform changes sinusoidally along the circumference of the rotor 5. The direction of the magnetic field lines 13 of the stator punching A11 is different from the direction of the magnetic field lines 23 of the stator punching B21. Figure 5 As shown, the peaks of the torque waveform formed by the stator punching A11 and the torque waveform formed by the stator punching B21 are staggered, and a phase difference is formed between the torque waveforms of the stator punching A11 and the stator punching B21. The average torque values ​​generated by the stator punching A11 and the stator punching B21 are similar, and the torque outputs of the stator punching A11 and the stator punching B21 are similar. The stator punching A11 and the stator punching B21 are staggered and superimposed, which optimizes the motor torque waveform, reduces the peak value of the torque peak, thereby reducing the motor torque pulsation and reducing the motor vibration noise.

[0053] refer to Figure 1 -6, test the first stator core, the second stator core and the stator formed by staggered stacking of this embodiment.

[0054] The first stator core is formed by stacking stator punching sheets A11. The outer diameter of the first stator core is 380 mm, the inner diameter is 278 mm, and 72 stator slots are provided at equal central angles of the first stator core. The stator slot opening width of the stator punching sheet A11 is W1. The stator slot opening widths of the stator punching sheet A11 in the circumferential direction are the same. The air gap width between the rotor 5 and the stator is G, and the width of W1 is 0.3*G.

[0055] The second stator core is formed by stacking stator punching sheets B21. The outer diameter of the second stator core is 380 mm, the inner diameter is 278 mm, and 72 stator slots are provided at equal central angles of the second stator core. The stator slot opening width of the stator punching sheet B21 is W2. The stator slot opening widths of the stator punching sheet B21 in the circumferential direction are the same. The air gap width between the rotor 5 and the stator is G, and the width W2 is 0.8*G.

[0056] refer to Figure 7As shown, the stator includes stator punching A11 and stator punching B21, which are stator punching A11 and stator punching B21 staggered and stacked, the stator outer diameter is 380 mm, the inner diameter is 278 mm, and the stator is provided with 72 stator slots at equal central angles. The stator slot opening width of the stator punching A11 is W1, and the stator slot opening width of the stator punching B21 is W2. After the rotor 5 is matched with the stator, the air gap width between the rotor 5 and the stator is G, the width of W1 is 0.3*G, and the width of W2 is 0.8*G.

[0057] The first stator core, the second stator core and Figure 7 The peak-to-peak torque and torque ripple values ​​of the motor in the stator are as follows:

[0058]

[0059] After the stator and the rotor 5 are assembled, the torque pulsation and peak-to-peak value of the motor are reduced, the vibration noise of the motor is reduced, and the efficiency of the motor is improved.

[0060] Based on the above structure and principle, refer to Figure 8 , combined with Figure 1 and Figure 2 As shown, the stator in this scheme can also be a two-section structure, the stator includes an axially stacked stator core A1 and a stator core B2, the stator core A1 includes a stator punching A11, the stator core B2 includes a stator punching B21, the ratio of the stator punching A11 to the stator punching B21 is 1:1, the stator punching A11 and the stator punching B21 are provided with the same number of stator slots, the difference between the stator punching A11 and the stator punching B21 is that in the axial direction of the stator, the slot widths of adjacent stator slots are different, the slot width of the stator slot A12 on the stator core A1 is smaller than the slot width of the stator slot B22 on the stator core B2, and when the stator is in use, the stator core A1 is located at the lower part of the stator core B2.

[0061] The present scheme can also be understood in this way: the stator includes multiple stator cores A1 and multiple stator cores B2, the stator core A1 includes multiple stator punchings A11, and the stator core B2 includes multiple stator punchings B21, but the ratio of the stator punchings A11 to the stator punchings B21 is 1:1, and the multiple stator cores A1 and the multiple stator cores B2 can be stacked and combined arbitrarily.

[0062] The ratio of the stator punching sheets between each width segment in Example 1 and the ratio of the number of stator punching sheets A11 to stator punching sheets B21 in Example 2 can be in a range of 0.1:1 to 10:1.

[0063] refer to Fig. 9As shown, the stator is a two-section type. In the axial direction of the stator, the width of the stator slot is divided into two width sections. The stator includes a stator core D6 and a stator core E7. The stator core D6 is formed by stacking stator punching sheets A11. The stator core E7 is formed by stacking stator punching sheets B21. The ratio of the number of stator punching sheets A11 to the number of stator punching sheets B21 is 2:1. The stator core D6 can be stacked on the upper or lower part of the stator core E7.

[0064] refer to Fig.10 As shown, the stator is a three-section type, and the stator includes a stator core F8, a stator core H9 and a stator core M10. The difference between the stator core F8 and the stator core H9 is only the width of the stator slot openings. The stator slot opening width of the stator core M10 can be the same as the stator slot opening width of the stator core F8 or the same as the stator slot opening width of the stator core H9, or the stator slot opening width of the stator core M10 is different from the stator slot opening width of the stator core F8 and the stator slot opening width of the stator core H9.

[0065] In this solution, when the stator includes two or more stator punchings, the stator punchings are provided with a plurality of stator slots in the circumferential direction, and the width of the stator slot openings between each stator punching is different. The width of the multiple stator slot openings of each stator punching may be the same or different. When the stator includes three or more stator punchings, each stator punching may be stacked separately to form a stator core, and then multiple stator cores are stacked to form a stator, or each stator punching is stacked alternately in sequence, or, the principle of different widths of the stator slot openings between two adjacent stator punchings is adopted, and the stator is stacked in any combination to achieve the purpose of optimizing the stator torque pulsation.

[0066] The present invention also provides a motor, including a rotor 5 and a stator, wherein the stator and the rotor 5 are matched, and the width between the rotor 5 and the stator is an air gap. In the present invention, the letter G represents the width of the air gap. The width of the stator slot of any stator punching sheet is W, and the ratio of W to the air gap G is greater than 0.2 and less than 2*π*R / Z*0.75. Fig.11 As shown, when the W / G ratio is between 0.2 and 2*π*R / Z*0.75, the optimization effect of the stator torque and torque ripple is obvious.

[0067] The present invention also provides an air-conditioning compressor, comprising the above-mentioned motor.

[0068] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A motor stator, characterized in that: The stator is provided with an axial hole for accommodating the rotor and a plurality of stator slots, and the stator slots are evenly distributed around the axial hole; The stator slot is provided with a slot opening toward the shaft hole, and in the axial direction of the stator, the stator slot has more than two width sections with different slot opening widths; Z is the number of stator slots, G is the air gap between the stator and the rotor, R is the diameter of the shaft hole, W is the width of any width segment of the stator slot opening, and 0.2<W / G<2*π*R / Z*0.

75.

2. The stator according to claim 1, characterized in that: The slot widths between a plurality of stator slots in the circumferential direction of the stator corresponding to each width segment are the same or different.

3. The stator according to claim 1, characterized in that: In the axial direction of the stator, the widths of the stator slot openings are different between adjacent width sections.

4. The stator according to claim 1, characterized in that: Each of the width sections is formed by stacking one, two or more stator sheets.

5. The stator according to claim 1, characterized in that: Each of the width segments is provided with one, two or more.

6. The stator according to claim 1, characterized in that: The stator comprises one or more stator cores A (1) and one or more stator cores B (2), wherein the stator cores A (1) and the stator cores B (2) are axially stacked to form the stator; In the axial direction of the stator, the widths of the stator slots corresponding to the stator core A (1) and the stator core B (2) are different.

7. The stator according to claim 6, characterized in that The stator core A (1) includes one or more stator punching sheets A (11), and the stator core B (2) includes one or more stator punching sheets B (21); The slot width of the stator slots on the stator punching sheet A (11) is different from the slot width of the stator slots on the stator punching sheet B (21).

8. The stator according to claim 7, characterized in that: The thickness of the stator punching sheet A (11) is the same as the thickness of the stator punching sheet B (21).

9. The stator according to claim 8, characterized in that: The ratio of the number of the stator punching sheets A (11) to the number of the stator punching sheets B (21) is 0.1:1 to 10:

1.

10. A motor, characterized in that: A stator comprising any one of claims 1 to 9.

11. An air-conditioning compressor, characterized in that: The motor comprising the motor described in claim 10.

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