Stator punching sheet, stator, motor and compressor

Abstract

The invention provides a stator punching sheet, a stator, a motor and a compressor, the stator punching sheet comprises a yoke part and a plurality of tooth parts, the tooth parts are arranged on the inner circumferential wall of the yoke part along the radial direction of the yoke part, and the plurality of tooth parts are arranged on the inner circumferential wall of the yoke part at intervals along the circumferential direction of the yoke part. A plurality of grooves are formed in the peripheral wall of the yoke part, the grooves penetrate through the yoke part in the axial direction of the yoke part, and the grooves and the tooth parts are arranged in a one-to-one correspondence mode. According to the compressor, the technical problem that in the prior art, a motor stator and a compressor shell in a compressor are assembled in an interference shrinkage fit mode, heat of the stator cannot be dissipated in time, and consequently the motor is prone to being damaged can be solved.

Description

Technical Field

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

[0002] Among all types of drive motors, permanent magnet synchronous motors have high energy density, high efficiency, small size, low inertia, and fast response, and are widely used in the field of household air-conditioning compressors. Permanent magnet motors are divided into two structures: fractional slot windings and integer slot windings according to the winding method of the armature winding. The permanent magnet motor with fractional slot winding has a large radial electromagnetic force due to the asymmetry of the magnetic circuit, which causes increased motor vibration and noise.

[0003] At present, the motor stator and compressor housing in most compressors are assembled by interference fit. In this rigid connection, the motor and the housing are in close contact, and a large amount of heat is generated during the operation of the motor, which makes it impossible to dissipate the heat of the stator in time. Excessive temperature can easily burn the motor and even the compressor.

[0004] Since the motor stator and the compressor housing in the compressor in the prior art are assembled by means of interference fit, the heat of the stator cannot be dissipated in time, resulting in technical problems such as easy damage to the motor. Therefore, the present invention studies and designs a stator punching sheet, a stator, a motor, and a compressor. Summary of the invention

[0005] Therefore, the present invention provides a stator punching sheet, a stator, a motor, and a compressor, which can solve the technical problem in the prior art that the motor stator and the compressor housing in the compressor are assembled by interference fit, the stator heat cannot be dissipated in time, and the motor is easily damaged.

[0006] In order to solve the above problems, the present invention provides a stator punching sheet, comprising: a yoke portion and a plurality of tooth portions, wherein the tooth portions are arranged on the inner circumferential wall of the yoke portion along the radial direction of the yoke portion, and along the circumferential direction of the yoke portion, a plurality of the tooth portions are arranged at intervals on the inner circumferential wall of the yoke portion, and a plurality of grooves are arranged on the outer circumferential wall of the yoke portion, and along the axial direction of the yoke portion, the grooves penetrate the yoke portion, and the grooves are arranged one-to-one with the tooth portions.

[0007] In some embodiments, taking the end face of the yoke as a projection surface, the inner wall of the groove includes a first section, a second section and a third section, the first section, the second section and the third section are connected in sequence, the second end is semicircular, and the opening of the second section faces the center of the yoke, the first section and the third section are arc-shaped, one end of the second section is connected to the outer peripheral wall of the yoke through the first section, and the other end of the second section is connected to the outer peripheral wall of the yoke through the third section.

[0008] In some embodiments, along the radial direction of the yoke, the line shape of the first segment and the line shape of the third segment are symmetrical about the center line of the second segment, and along the radial outward direction of the yoke, the first segment and the third segment are convex arcs.

[0009] In some embodiments, the diameter of the second section is D1, and the minimum distance between the second section and the outer circle of the yoke is L1, which satisfies 0.8≤D1 / L1≤1.6.

[0010] In some embodiments, a first line is defined between an end of the first segment facing away from the second end and the center of the yoke, a second line is defined between one end of the second end and the center of the yoke, and a third line is defined between the other end of the second end and the center of the yoke. An angle α1 is defined between the first line and the second line, and an angle α2 is defined between the second line and the third line, which satisfies the condition that 0.8≤α1 / α2≤1.2.

[0011] In some embodiments, the width of the tooth portion is H1, and the diameter of the second segment is D1, which satisfies 0.4≤D1 / H1≤0.6.

[0012] In some embodiments, along the radial direction of the yoke, the width of the yoke is H2, and the minimum distance between the second section and the outer circle of the yoke is L1, which satisfies L1≤0.25H2.

[0013] In some embodiments, along the radial direction of the yoke, a center line of the groove coincides with a center line of the tooth portion.

[0014] The present invention also provides a stator, which comprises the above-mentioned stator punching sheet.

[0015] The present invention also provides a motor, which comprises the above-mentioned stator.

[0016] In some embodiments, the motor includes a rotor having a plurality of flow grooves, the total area of ​​the plurality of flow grooves is S2, the total area of ​​the region enclosed by the plurality of grooves and the outer circle of the yoke is S1, which satisfies S1≤S2.

[0017] The present invention also provides a compressor, which comprises the above-mentioned motor.

[0018] The stator punching sheet, stator, motor and compressor provided by the present invention have the following beneficial effects:

[0019] The outer peripheral wall at the junction of the stator teeth and the yoke is constructed with N grooves, which are the same as the number of stator teeth, and the grooves are located on the center line of the stator teeth. Through this structure, on the one hand, the magnetic circuit structure of the stator is optimized, the stator iron loss is reduced, and the power density of the motor is improved. On the other hand, the radial electromagnetic force amplitude is reduced, and the motor noise and vibration are reduced. On the other hand, the refrigerant circulation area is increased, and the heat in the stator operation is taken away by the refrigerant, which improves the power density of the motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the implementation methods of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for the implementation methods or the description of the prior art. The drawings described below are only exemplary, and for ordinary technicians in this field, other implementation drawings can be derived from the provided drawings without creative work.

[0021] Figure 1 The structure of the stator punching sheet of the present invention is shown in FIG. Figure 1 ;

[0022] Figure 2 The structure of the stator punching sheet of the present invention is shown in FIG. Figure 1 ;

[0023] Figure 3 is a structural schematic diagram of a motor according to another embodiment of the present invention;

[0024] Figure 4 is a comparison diagram of iron loss between a motor of another embodiment of the present invention and the prior art;

[0025] Figure 5 is a comparison diagram of radial electromagnetic force between a motor of another embodiment of the present invention and the prior art;

[0026] Figure 6 This is a noise comparison diagram between a motor according to another embodiment of the present invention and the prior art.

[0027] The accompanying drawings are marked as follows:

[0028] 1. Yoke; 2. Tooth; 3. Groove; 4. First section; 5. Second section; 6. Third section. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present invention and its application or use. 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.

[0030] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the devices or elements referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention. The directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0031] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0032] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the present invention.

[0033] See also Figure 1-6As shown, according to an embodiment of the present invention, a stator punching sheet is provided, comprising: a yoke 1 and a plurality of teeth 2, wherein the teeth 2 are arranged on the inner peripheral wall of the yoke 1 along the radial direction of the yoke 1, and the plurality of teeth 2 are arranged at intervals on the inner peripheral wall of the yoke 1 along the circumferential direction of the yoke 1, and the outer peripheral wall of the yoke 1 is provided with a plurality of grooves 3, and the grooves 3 penetrate the yoke 1 along the axial direction of the yoke 1, and the grooves 3 are arranged one by one with the teeth 2. In this technical solution, the yoke 1 is annular, the teeth 2 are arranged on the inner peripheral wall of the yoke 1 along the radial direction of the yoke 1, and the teeth 2 have a plurality of teeth, and the plurality of teeth 2 are arranged at intervals on the inner peripheral wall of the yoke 1 along the circumferential direction of the yoke 1. When the stator punching sheet is installed in a compressor, a flow channel is formed between the groove 3 and the inner wall of the compressor housing, and the refrigerant flows through the flow channel, thereby improving the cooling effect of the motor.

[0034] In some embodiments, with the end face of the yoke 1 as the projection surface, the inner wall of the groove 3 includes a first section 4, a second section 5 and a third section 6, the first section 4, the second section 5 and the third section 6 are connected in sequence, the second end 5 is semicircular, and the opening of the second section 5 faces the center of the yoke 1, the first section 4 and the third section 6 are arc-shaped, one end of the second section 5 is connected to the outer peripheral wall of the yoke 1 through the first section 4, and the other end of the second section 5 is connected to the outer peripheral wall of the yoke 1 through the third section 6. In this technical solution, a plurality of stator teeth are arranged on the stator yoke along the circumferential direction of the stator yoke, and N grooves with the same number as the stator teeth are constructed on the outer peripheral wall at the junction of the stator teeth and the yoke, and the grooves are composed of the convex arcs at the two ends and the convex 1 / 2 circle in the middle to form a "W" type flow structure, which is located on the center line of the stator teeth. Through this "W" type flow structure, on the one hand, the magnetic circuit structure of the stator is optimized, the stator iron loss is reduced, and the power density of the motor is improved. On the other hand, it reduces the radial electromagnetic force amplitude, reduces motor noise and vibration, and on the other hand, it increases the refrigerant circulation area, takes away the heat of the stator during operation through the refrigerant, and improves the motor power density.

[0035] In some embodiments, along the radial direction of the yoke 1, the line shape of the first segment 4 and the line shape of the third segment 6 are symmetrical about the center line of the second segment 5, and along the radial outward direction of the yoke 1, the first segment 4 and the third segment 6 are convex arcs. In this technical solution, the line shape of the first segment 4 and the line shape of the third segment 6 are symmetrical about the center line of the second segment 5, that is, the shape of the first segment 4 and the shape of the third segment 6 are mirror-symmetric about the center line of the second segment 5. A "W"-shaped groove structure consisting of convex arcs at both ends and a convex 1 / 2 circle in the middle is constructed on the outer peripheral wall at the intersection of the stator tooth and the yoke.

[0036] In some embodiments, the diameter of the second section 5 is D1, and the minimum distance between the second section 5 and the outer circle of the yoke 1 is L1, which satisfies 0.8≤D1 / L1≤1.6. There is a first connecting line between the end of the first section 4 facing away from the second end 5 and the center of the yoke 1, there is a second connecting line between one end of the second end 5 and the center of the yoke 1, and there is a third connecting line between the other end of the second end 5 and the center of the yoke 1, and there is an angle α1 between the first connecting line and the second connecting line, and there is an angle α2 between the second connecting line and the third connecting line, which satisfies 0.8≤α1 / α2≤1.2. In this technical solution, the diameter of the second section 5 is D1, and the minimum distance between the second section 5 and the outer circle of the yoke 1 is L1, which satisfies 0.8≤D1 / L1≤1.6. There is a first line between the end of the first section 4 facing away from the second end 5 and the center of the yoke 1, a second line between one end of the second end 5 and the center of the yoke 1, and a third line between the other end of the second end 5 and the center of the yoke 1. There is an angle α1 between the first line and the second line, and an angle α2 between the second line and the third line, which satisfies 0.8≤α1 / α2≤1.2. This constraint mainly limits the "W" type flow structure in the tangential direction, which is conducive to optimizing the magnetic circuit structure of the stator, reducing the stator iron loss, and improving the motor power density. The iron loss of the two motors is obtained by finite element software, combined with reference to Figure 4 As shown, compared with the motor with the existing structure, the iron loss of the motor with the stator punching sheet of the present invention is significantly reduced, the motor loss is reduced, and the motor efficiency is improved.

[0037] In some embodiments, the width of the tooth portion 2 is H1, and the diameter of the second section 5 is D1, which satisfies 0.4≤D1 / H1≤0.6. Along the radial direction of the yoke 1, the width of the yoke 1 is H2, and the minimum distance between the second section 5 and the outer circle of the yoke 1 is L1, which satisfies L1≤0.25H2. In this technical solution, the width of the tooth portion 2 is H1, and the diameter of the second section 5 is D1, which satisfies 0.4≤D1 / H1≤0.6. Along the radial direction of the yoke 1, the width of the yoke 1 is H2, and the minimum distance between the second section 5 and the outer circle of the yoke 1 is L1, which satisfies L1≤0.25H2. This constraint mainly limits the "W" type flow-through structure in the radial direction, which is beneficial to reducing the radial electromagnetic force amplitude and reducing motor noise and vibration. By performing Fourier decomposition on the electromagnetic force in the simulation results, the radial electromagnetic force amplitudes of each order can be obtained. Combined with reference to Figure 5 and Figure 6 As shown, compared with a motor of a common structure, the amplitude of the radial electromagnetic force of the 2nd to 9th order of the motor with the stator punching sheet of the present invention is significantly reduced, thereby reducing the noise and vibration of the motor.

[0038] In some embodiments, along the radial direction of the yoke 1, the center line of the groove 3 coincides with the center line of the tooth 2. In this technical solution, by coinciding the center line of the groove 3 with the center line of the tooth 2 along the radial direction of the yoke 1, on the one hand, the magnetic circuit structure of the stator can be optimized, the stator iron loss can be reduced, and the power density of the motor can be improved. On the other hand, the amplitude of the radial electromagnetic force of the stator is reduced, and the noise and vibration of the motor are reduced.

[0039] The present invention also provides a stator, which comprises the above-mentioned stator punching sheet.

[0040] The stator of the present invention is composed of a stator core, an insulating skeleton, a winding and other parts. The stator core is formed by axially stacking multiple layers of silicon steel sheets, and the silicon steel sheets are stator punchings. The stator punchings are composed of a stator yoke 1 and a stator tooth 2. The stator of the present invention adopts the above-mentioned stator punchings, and N grooves 3 with the same number as the stator teeth are constructed on the outer peripheral wall at the junction of the stator tooth 2 and the yoke 1, and the grooves 3 are located on the center line of the stator tooth 2. Through this structure, on the one hand, the magnetic circuit structure of the stator is optimized, the stator iron loss is reduced, and the power density of the motor is improved. On the other hand, the radial electromagnetic force amplitude is reduced, and the motor noise and vibration are reduced. On the other hand, the refrigerant circulation area is increased, and the heat in the stator operation is taken away by the refrigerant, thereby improving the power density of the motor.

[0041] The stator of the present invention optimizes the magnetic circuit structure of the stator, reduces the iron loss of the stator, and improves the power density of the motor. It reduces the amplitude of the radial electromagnetic force, reduces the noise and vibration of the motor, increases the circulation area of ​​the refrigerant, and removes the heat of the stator during operation through the refrigerant, thereby improving the power density of the motor.

[0042] In some embodiments, the motor includes a rotor having a plurality of flow grooves, the total area of ​​the plurality of flow grooves is S2, the total area of ​​the region enclosed by the plurality of grooves 3 and the outer circle of the yoke 1 is S1, which satisfies S1≤S2. In this technical solution, the motor of the present invention is provided with a "W"-shaped groove structure on the outer wall of the stator punching sheet to increase the refrigerant flow area, take away the heat of the stator during operation through the refrigerant, improve the power density of the motor, and improve the efficiency of the motor.

[0043] The present invention also provides a motor, which comprises the above-mentioned stator.

[0044] The present invention also provides a compressor, which comprises the above-mentioned motor.

[0045] It is easy for those skilled in the art to understand that, without conflict, the advantageous technical features of the above-mentioned methods can be freely combined and superimposed.

[0046] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the present invention. The above description is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and variations can be made without departing from the technical principles of the present invention. These improvements and variations should also be regarded as the protection scope of the present invention.

Claims

1. A stator punching sheet, characterized in that: include: A yoke (1) and a plurality of teeth (2), wherein the teeth (2) are arranged on the inner peripheral wall of the yoke (1) along the radial direction of the yoke (1), and along the circumferential direction of the yoke (1), the plurality of teeth (2) are arranged at intervals on the inner peripheral wall of the yoke (1), and a plurality of grooves (3) are arranged on the outer peripheral wall of the yoke (1), and along the axial direction of the yoke (1), the grooves (3) penetrate the yoke (1), and the grooves (3) are arranged one-to-one with the teeth (2).

2. The stator lamination according to claim 1, characterized in that: Taking the end face of the yoke (1) as a projection surface, the inner wall of the groove (3) comprises a first section (4), a second section (5) and a third section (6); the first section (4), the second section (5) and the third section (6) are connected in sequence; the second end (5) is semicircular, and the opening of the second section (5) faces the center of the yoke (1); the first section (4) and the third section (6) are arc-shaped; one end of the second section (5) is connected to the outer peripheral wall of the yoke (1) through the first section (4); and the other end of the second section (5) is connected to the outer peripheral wall of the yoke (1) through the third section (6).

3. The stator sheet according to claim 2, characterized in that: Along the radial direction of the yoke (1), the line shape of the first section (4) and the line shape of the third section (6) are symmetrical about the center line of the second section (5), and along the radial outward direction of the yoke (1), the first section (4) and the third section (6) are convex arcs.

4. The stator sheet according to claim 2, characterized in that: The diameter of the second section (5) is D1, and the minimum distance between the second section (5) and the outer circle of the yoke (1) is L1, which satisfies 0.8≤D1 / L1≤1.

6.

5. The stator lamination according to claim 2, characterized in that: A first connecting line is defined between the end of the first section (4) facing away from the second end (5) and the center of the yoke (1), a second connecting line is defined between one end of the second end (5) and the center of the yoke (1), a third connecting line is defined between the other end of the second end (5) and the center of the yoke (1), an angle α1 is defined between the first connecting line and the second connecting line, an angle α2 is defined between the second connecting line and the third connecting line, and the condition that 0.8≤α1 / α2≤1.2 is satisfied.

6. The stator lamination according to claim 2, characterized in that: The width of the tooth portion (2) is H1, and the diameter of the second section (5) is D1, which satisfies 0.4≤D1 / H1≤0.

6.

7. The stator sheet according to claim 2, characterized in that: Along the radial direction of the yoke (1), the width of the yoke (1) is H2, and the minimum distance between the second section (5) and the outer circle of the yoke (1) is L1, which satisfies that L1≤0.25H2.

8. The stator lamination according to claim 1, characterized in that: Along the radial direction of the yoke (1), the center line of the groove (3) coincides with the center line of the tooth (2).

9. A stator, characterized in that: The invention comprises the stator punching sheet according to any one of claims 1 to 8.

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

11. The motor according to claim 10, characterized in that: The motor comprises a rotor having a plurality of flow grooves, the total area of ​​the plurality of flow grooves being S2, the total area of ​​the region enclosed by the plurality of grooves (3) and the outer circle of the yoke (1) being S1, which satisfies S1≤S2.

12. A compressor, characterized in that: Comprising the stator as claimed in claim 9.

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