Stator punching sheet, motor and compressor

Abstract

The utility model 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 circumferential surface of the yoke part at intervals; wherein the tooth part is provided with an inner arc edge far away from the yoke part and a side edge connected with the inner arc edge, the inner arc edge is provided with a notch, the notch is located on one side of the center line of the tooth part, and the notch penetrates through the side edge; according to the technical scheme of the utility model, the gaps are arranged on the inner arc edges of the stator punching sheets, so that the air-gap magnetic field of the motor during operation is weakened, the noise of the motor during operation is reduced, and the requirement of the novel motor on the low-noise function is met.

Description

Technical Field

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

[0002] In recent years, the power density of motors has increased, and there are higher requirements for motor efficiency and noise. There are still many motor noise problems in the market, which cannot meet the low-noise requirements of new motors. Therefore, there is an urgent need to design high-efficiency and low-noise motors. Utility Model Content

[0003] The main purpose of the utility model is to provide a stator punching sheet, a motor and a compressor, aiming at reducing the noise generated when the motor is running.

[0004] In order to achieve the above-mentioned purpose, the stator punching sheet proposed by the utility model comprises:

[0005] yoke;

[0006] A plurality of teeth are arranged at intervals on the inner circumference of the yoke;

[0007] The tooth portion has an inner arc edge away from the yoke portion and a side edge connected to the inner arc edge, the inner arc edge is provided with a notch, the notch is located on one side of the center line of the tooth portion, and the notch passes through the side edge.

[0008] In one embodiment, the notch has a bottom point that is farthest from the center of the stator punching sheet, and the distance between the bottom point and the center of the stator punching sheet is h, and h satisfies 0.3mm≤h≤0.7mm.

[0009] In one embodiment, the notch has a first straight edge and a second straight edge connected to each other, the first straight edge is closer to the center line of the tooth portion than the second straight edge, the intersection of the first straight edge and the second straight edge is the bottom point, the first straight edge has an endpoint close to the center line of the tooth portion, an angle A1 is formed between a line connecting the endpoint and the center of the stator punching sheet and the center line of the tooth portion, an angle A2 is formed between a line connecting the bottom point and the center of the stator punching sheet and the center line of the tooth portion, and A1 and A2 satisfy 0.2≤A1 / A2≤0.7.

[0010] In one embodiment, the extension line of the second straight side and the extension line of the inner arc side have an intersection point, and an angle A3 is formed between the intersection point, the line connecting the center of the stator punching sheet and the center line of the tooth portion, a stator slot is formed between any two of the tooth portions, the stator slot has a slot opening, the width of the slot opening is bs, the number of slots of the stator slot is Z, the distance from the inner arc side to the center of the stator punching sheet is R1, and A3 satisfies π / Z-arcsin(bs / 2R1)<A3<π / Z+arcsin(bs / 2R1).

[0011] In one embodiment, the circumferential angle corresponding to any tooth portion and any adjacent stator slot is αs, αs and Z satisfy αs=2π / Z, bs satisfies bs=R1sin(k·αs), and k satisfies 0.06≤k≤0.125.

[0012] In one embodiment, R1 satisfies 10 mm ≤ R1 ≤ 40 mm.

[0013] In one embodiment, the inner edge of the notch is arranged in the form of an arc edge.

[0014] The utility model also proposes a motor, which includes a stator punching sheet, and the stator punching sheet includes a yoke and a plurality of tooth portions; the plurality of tooth portions are arranged at intervals on the inner circumferential surface of the yoke; wherein the tooth portion has an inner arc edge away from the yoke and a side edge connected to the inner arc edge, the inner arc edge is provided with a notch, the notch is located on one side of the center line of the tooth portion, and the notch passes through the side edge.

[0015] In one embodiment, the motor is a unidirectional running motor, the tooth portion includes a front tooth shoe and a rear tooth shoe located on opposite sides of the center line of the tooth portion, the direction from the rear tooth shoe to the front tooth shoe is consistent with the rotation direction of the motor rotor, and the notch is opened in the rear tooth shoe.

[0016] The utility model also proposes a compressor, which includes a motor, the motor includes a stator punching sheet, the stator punching sheet includes a yoke and a plurality of tooth portions; the plurality of tooth portions are arranged at intervals on the inner circumferential surface of the yoke; wherein the tooth portion has an inner arc edge away from the yoke and a side edge connected to the inner arc edge, the inner arc edge is provided with a notch, the notch is located on one side of the center line of the tooth portion, and the notch passes through the side edge.

[0017] The technical solution of the utility model adopts the method of providing a notch on the inner arc edge of the stator punching sheet, thereby weakening the air gap magnetic field when the motor is running, thereby reducing the noise when the motor is running, meeting the demand of the new motor for low noise function. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the utility model 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 utility model. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0019] Figure 1 A structural schematic diagram of an embodiment of a stator punching sheet provided by the utility model;

[0020] Figure 2 for Figure 1 A partial enlarged view of the middle A;

[0021] Figure 3 The motor pressure bar graphs of the motor provided by the utility model and two comparative examples.

[0022] Description of Figure Numbers:

[0023] 100, stator punching sheet; 1, yoke; 2, tooth; 21, inner arc edge; 211, notch; 211a, bottom point; 211b, first straight edge; 211c, second straight edge; 211d, end point; 211e, intersection point; 22, side; 23, stator slot; 231, notch; 24, front tooth shoe; 25, rear tooth shoe.

[0024] The realization of the purpose, functional features and advantages of the utility model will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0026] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back...), 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 indications will also change accordingly.

[0027] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the utility model, 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 utility model.

[0028] In recent years, the power density of motors has increased, and there are higher requirements for motor efficiency and noise. There are still many motor noise problems in the market, which cannot meet the low-noise requirements of new motors. Therefore, there is an urgent need to design high-efficiency and low-noise motors.

[0029] In view of this, the present invention proposes a stator punching sheet 100 . The stator punching sheet 100 proposed in the present invention is used for a motor.

[0030] See also Figure 1 and Figure 2 In one embodiment of the utility model, the stator punching sheet 100 includes a yoke 1 and a plurality of tooth portions 2; the plurality of tooth portions 2 are arranged at intervals on the inner circumferential surface of the yoke 1; wherein the tooth portion 2 has an inner arc edge 21 away from the yoke 1 and a side edge 22 connected to the inner arc edge 21, the inner arc edge 21 is provided with a notch 211, the notch 211 is located on one side of the center line of the tooth portion 2, and the notch 211 passes through the side edge 22.

[0031] Specifically, it should be noted that the stator punching sheet 100 includes a yoke 1 and a plurality of teeth 2, and the plurality of teeth 2 and the yoke 1 are integrally stamped. The yoke 1 is roughly annular, and the teeth 2 protrude from the inner periphery of the yoke 1 and are arranged in the middle of the yoke 1, so the teeth 2 have a side away from the yoke 1, and the side of the teeth 2 away from the yoke 1 is set as an inner arc edge 21, where the inner of the inner arc edge 21 refers to the side of the teeth 2 away from the yoke 1, and the inner arc edge 21 can be convex arc-shaped or concave arc-shaped. In this embodiment, the inner arc edge 21 is set as a concave arc shape.

[0032] Considering that the motor has a large noise problem, a notch 211 is provided on the inner arc edge 21. Providing the notch 211 here has at least the following beneficial effects:

[0033] First, the notch 211 on the inner arc edge 21 can optimize the magnetic flux path: by providing the notch 211 on the inner arc edge 21 of the tooth portion 2, the magnetic flux path between the stator and the rotor can be optimized. This helps to reduce electromagnetic noise caused by irregular or concentrated magnetic flux paths. When the magnetic flux path is smoother and more uniform, the electromagnetic vibration and noise inside the motor will be reduced accordingly.

[0034] Secondly, the notch 211 can also reduce mechanical vibration: a well-designed notch 211 may help reduce the mechanical vibration of the stator punching sheet 100 during the operation of the motor. Mechanical vibration is one of the important sources of motor noise, especially under high load or high speed conditions. By optimizing the structure of the tooth portion 2, the noise generated by vibration can be reduced.

[0035] Most importantly, the notch 211 formed on the inner arc edge 21 weakens the influence of the air gap magnetic field. During the transmission process of the motor, the continuously appearing air gap magnetic field causes the tooth 2 to vibrate, thereby generating aerodynamic noise. The notch 211 can effectively weaken the influence of the air gap magnetic field, reduce the noise caused by the vibration of the tooth 2, and improve the stability of the motor operation.

[0036] More specifically, the gap 211 is provided on the inner arc edge 21 to weaken the air gap magnetic field mainly by adjusting the magnetic field distribution, increasing magnetic resistance, weakening harmonics, etc. On this basis, the gap 211 is also provided through the side edge 22 to reduce the motor noise, and the vibration and noise during the operation of the motor can be reduced by reducing the magnetic flux density.

[0037] The technical solution of the utility model adopts the method of opening a notch 211 on the inner arc edge 21 of the stator punching sheet 100, thereby weakening the air gap magnetic field when the motor is running, thereby reducing the noise when the motor is running, meeting the demand for low noise function of new motors.

[0038] In one embodiment, see Figure 2 The notch 211 has a bottom point 211a which is farthest from the center of the stator punching sheet 100. The distance between the bottom point 211a and the center of the stator punching sheet 100 is h, and h satisfies 0.3mm≤h≤0.7mm.

[0039] In this embodiment, considering that the notch 211 should not be too deep, otherwise the structural strength of the tooth portion 2 may be unstable, the distance from the bottom point 211a to the center of the stator punching sheet 100 is set to be less than or equal to 0.7mm. In addition, if the notch 211 is too shallow, it may not meet the requirement of weakening the air gap magnetic field, and thus cannot have a more obvious noise reduction effect. Therefore, the distance from the bottom point 211a to the center of the stator punching sheet 100 is set to be greater than or equal to 0.3mm.

[0040] Preferably, see Figure 2 The notch 211 has a first straight side 211b and a second straight side 211c connected to each other, the first straight side 211b is closer to the center line of the tooth portion 2 than the second straight side 211c, the intersection of the first straight side 211b and the second straight side 211c is the bottom point 211a, the first straight side 211b has an endpoint 211d close to the center line of the tooth portion 2, an angle A1 is formed between the line connecting the endpoint 211d and the center of the stator punching sheet 100 and the center line of the tooth portion 2, an angle A2 is formed between the bottom point 211a and the line connecting the center of the stator punching sheet 100 and the center line of the tooth portion 2, and A1 and A2 satisfy 0.2≤A1 / A2≤0.7.

[0041] In this embodiment, the shape of the notch 211 is roughly fan-shaped, and the notch 211 has a first straight side 211b and a second straight side 211c. This embodiment is intended to further optimize the performance of the motor and reduce noise. By precisely controlling the length and angle (A1 and A2) of the first straight side 211b and the second straight side 211c of the notch 211, the magnetic flux path between the stator and the rotor can be optimized. This design can reduce the source of electromagnetic noise, that is, the vibration and noise caused by the uneven distribution of electromagnetic force in the air gap. When the ratio of A1 and A2 meets a certain range (such as 0.2≤A1 / A2≤0.7), the smoothness and uniformity of the magnetic flux path can be ensured, thereby reducing electromagnetic noise.

[0042] Further, in one embodiment, see Figure 2 , the extension line of the second straight edge 211c and the extension line of the inner arc edge 21 have an intersection point 211e, and an angle A3 is formed between the intersection point 211e and the line connecting the center of the stator punching sheet 100 and the center line of the tooth portion 2. A stator slot 23 is formed between any two of the tooth portions 2, and the stator slot 23 has a slot opening 231. The width of the slot opening 231 is bs, and the number of slots of the stator slot 23 is Z. The distance from the inner arc edge 21 to the center of the stator punching sheet 100 is R1, and A3 satisfies π / Z-arcsin(bs / 2R1)<A3<π / Z+arcsin(bs / 2R1).

[0043] Specifically, in order to further improve the performance of the motor, this embodiment accurately controls the size of A3 by the width of the slot 231, the number of slots of the stator slot 23, and the distance from the inner arc edge 21 to the center of the stator punching sheet 100, ensuring that A3 is within a reasonable range. When A=satisfies π / Z-arcsin(bs / 2R1)<A3<π / Z+arcsin(bs / 2R1), this actually limits the proportional relationship between the width bs of the slot 231 and the radius R1 of the stator punching sheet 100. This proportional relationship helps to optimize the electromagnetic field distribution and reduce the generation of electromagnetic noise.

[0044] In one embodiment, see Figure 2 The circumferential angle corresponding to any tooth portion 2 and any adjacent stator slot 23 is αs, αs and Z satisfy αs=2π / Z, bs satisfies bs=R1sin(k·αs), and k satisfies 0.06≤k≤0.125.

[0045] Specifically, the relationship between the width of the slot 231 and the circumferential angle can be precisely controlled by the formula bs=R1sin(k·αs), where bs is the width of the slot 231 of the stator slot 23, R1 is the distance from the inner arc edge 21 to the center of the stator punching sheet 100, αs is the circumferential angle corresponding to any tooth portion 2 and any adjacent stator slot 23, and k is a constant satisfying 0.06≤k≤0.125. This relationship ensures that the width of the slot 231 matches the overall design of the stator punching sheet 100, and avoids the increase of electromagnetic noise and mechanical noise that may be caused by the slot 231 being too wide or too narrow.

[0046] In one embodiment, referring to the figure, R1 satisfies 10mm≤R1≤40mm.

[0047] Specifically, when R1 is within this range, it can ensure that the size of the stator punching sheet 100 matches the overall design of the motor, which helps to optimize the magnetic flux path, making the magnetic flux more evenly distributed between the stator punching sheet 100 and the rotor, and reducing electromagnetic noise caused by uneven magnetic flux distribution.

[0048] In one embodiment, see Figure 2 The inner edge of the notch 211 is arranged to be an arc edge.

[0049] It should be noted that the arc-shaped inner edge helps to smoothly guide the magnetic flux to flow between the stator sheet 100 and the rotor. Compared with sharp or uneven edges, the arc-shaped edge can reduce the concentration and mutation of the magnetic flux at the edge, thereby reducing the electromagnetic noise caused by the uneven distribution of the magnetic flux.

[0050] The utility model also proposes a motor, which includes a stator punching sheet 100. The specific structure of the stator punching sheet 100 refers to the above embodiment. Since the 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.

[0051] In one embodiment, see Figure 1 and Figure 2The motor is a unidirectional motor, the tooth portion 2 includes a front tooth shoe 24 and a rear tooth shoe 25 located on opposite sides of the center line of the tooth portion 2, the direction from the rear tooth shoe 25 to the front tooth shoe 24 is consistent with the rotation direction of the motor rotor, and the notch 211 is opened in the rear tooth shoe 25.

[0052] Considering that the motor is a conventional unidirectional motor, the motor rotor structure has not been improved, so the motor rotor is not shown in the figure. Figure 1 The direction of ω shown in the figure is consistent, so the direction from the rear tooth shoe 25 to the front tooth shoe 24 is consistent with the rotation direction of the motor rotor. In this way, the gap in the rear tooth shoe 25 is beneficial to reduce the noise generated when the motor is running. Figure 3 ,in Figure 3 The vertical axis represents the motor pressure, where the greater the pressure, the greater the noise. The orange embodiment of the motor proposed by the utility model, Comparative Example 1 is a comparative scheme in which a gap is not provided in the rear tooth boot, and Comparative Example 2 is a comparative scheme in which a gap is provided in the front tooth boot. It can be seen that the pressure of this embodiment is the smallest, so the noise generated is the smallest; and the noise generated by the gap in the front tooth boot is the largest, so the gap is provided in the rear tooth boot to produce a beneficial effect of noise reduction on the motor.

[0053] The utility model also proposes a compressor, which includes a motor. The specific structure of the motor refers to the above embodiment. Since the motor adopts all the technical solutions of all the above embodiments, it at least has all the beneficial effects brought by the technical solutions of the above embodiments, which will not be described one by one here.

[0054] 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 for a motor, characterized in that: include: yoke; A plurality of teeth are arranged at intervals on the inner circumference of the yoke; The tooth portion has an inner arc edge away from the yoke portion and a side edge connected to the inner arc edge, the inner arc edge is provided with a notch, the notch is located on one side of the center line of the tooth portion, and the notch passes through the side edge.

2. The stator sheet according to claim 1, characterized in that: The notch has a bottom point that is farthest from the center of the stator punching sheet, and the distance between the bottom point and the center of the stator punching sheet is h, and h satisfies 0.3mm≤h≤0.7mm.

3. The stator sheet according to claim 2, characterized in that: The notch has a first straight side and a second straight side connected to each other, the first straight side is closer to the center line of the tooth portion than the second straight side, the intersection of the first straight side and the second straight side is the bottom point, the first straight side has an endpoint close to the center line of the tooth portion, an angle A1 is formed between a line connecting the endpoint and the center of the stator punching sheet and the center line of the tooth portion, an angle A2 is formed between a line connecting the bottom point and the center of the stator punching sheet and the center line of the tooth portion, and A1 and A2 satisfy 0.2≤A1 / A2≤0.

7.

4. The stator sheet according to claim 3, characterized in that: The extension line of the second straight side and the extension line of the inner arc side have an intersection point, and an angle A3 is formed between the intersection point, the line connecting the center of the stator punching sheet and the center line of the tooth portion. A stator slot is formed between any two of the tooth portions, and the stator slot has a slot opening. The width of the slot opening is bs, the number of slots of the stator slot is Z, and the distance from the inner arc side to the center of the stator punching sheet is R1. A3 satisfies π / Z-arcsin(bs / 2R1)<A3<π / Z+arcsin(bs / 2R1).

5. The stator sheet according to claim 4, characterized in that: The circumferential angle between any tooth portion and any adjacent stator slot is αs, αs and Z satisfy αs=2π / Z, bs satisfies bs=R1sin(k·αs), and k satisfies 0.06≤k≤0.

125.

6. The stator sheet according to claim 5, characterized in that: The R1 satisfies 10mm≤R1≤40mm.

7. The stator sheet according to claim 2, characterized in that: The inner edge of the notch is arranged in the form of an arc edge.

8. A motor, characterized in that: Comprising the stator punching sheet as claimed in any one of claims 1 to 7.

9. The motor according to claim 8, characterized in that The motor is a unidirectional motor, the tooth portion includes a front tooth shoe and a rear tooth shoe located on opposite sides of the center line of the tooth portion, the direction from the rear tooth shoe to the front tooth shoe is consistent with the rotation direction of the motor rotor, and the notch is opened in the rear tooth shoe.

10. A compressor, characterized in that: Comprising a motor as claimed in any one of claims 8 to 9.

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