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, and the plurality of tooth parts are arranged on the inner circumferential surface of the yoke part at intervals; wherein the yoke part comprises a plurality of arc edge sections and a plurality of edge cutting sections, the arc edge sections and the edge cutting sections are alternately connected, the edge cutting sections and the tooth parts are correspondingly arranged, the edge cutting sections comprise a plurality of first cutting edges, the first cutting edges are provided with a plurality of first notches and a plurality of second notches, the area of the first notches is S1, the area of the second notches is S2, and S1 and S2 meet the condition that S1 / S2 is larger than or equal to 0.21 and smaller than or equal to 0.49. According to the technical scheme of the utility model, the first notch and the second notch are arranged on the first cutting edge of the stator punching sheet, so that structural deformation caused by heating in the process of mounting the stator and the shell in a matching manner is avoided, and the iron loss of the stator is further reduced.

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] Compressor motors are widely used in various refrigeration and air-conditioning systems and are the core of refrigeration and air-conditioning systems. During the installation process, the stator and the housing of the motor in the compressor need to be shrink-fitted and extruded, which may cause the outer circumference of the stator to deform due to compressive stress, thereby increasing iron loss and reducing the performance of the motor and compressor. 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 iron loss of the motor.

[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] Wherein, the yoke portion includes a plurality of arc edge segments and a plurality of trimming edge segments, the arc edge segments and the trimming edge segments are alternately connected, the trimming edge segments and the tooth portions are arranged correspondingly, the plurality of trimming edge segments include a plurality of first trimming edges, the first trimming edges are provided with a plurality of first notches and a plurality of second notches, the area of ​​the first notch is S1, the area of ​​the second notch is S2, and S1 and S2 satisfy 0.21≤S1 / S2≤0.49.

[0008] In one embodiment, the number of the first notch and the number of the second notch are respectively set to two, and the two first notches are located between the two second notches.

[0009] In one embodiment, the first cutting edge is further provided with a third notch, and the third notch is located between the two first notches.

[0010] In one embodiment, the area of ​​the third notch is S3, and S3 and S2 satisfy S2≤S3≤2S2.

[0011] In one embodiment, the two first notches and the two second notches are symmetrically distributed on opposite sides of a vertical line passing through the midpoint of the trimming section.

[0012] In one embodiment, the adjacent first notch and the second notch respectively form a first angle θ1 with a line connecting the center of the stator punching sheet, and θ1 satisfies 2.5°≤θ1≤4.5°; the adjacent second notch and the third notch respectively form a second angle θ2 with a line connecting the center of the stator punching sheet, and θ2 satisfies 5°≤θ2≤7°.

[0013] In one embodiment, the width of the tooth portion is bt, the length of the first cutting edge is b, and bt and b satisfy 1.62bt≤b≤2.65bt.

[0014] In one embodiment, the plurality of trimming sections further include a plurality of second trimming edges, any of the second trimming edges is adjacent to the first trimming edge in the circumferential direction of the yoke, and a fourth notch is formed in the second trimming edge.

[0015] In one embodiment, the plurality of trimming sections further include a plurality of third trimming edges, any of the third trimming edges is located between the first trimming edge and the second trimming edge in the circumferential direction of the yoke, and a positioning opening is formed in the third trimming edge.

[0016] 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, and the plurality of tooth portions are arranged at intervals on the inner circumferential surface of the yoke; wherein the yoke includes a plurality of arc edge segments and a plurality of trimming segments, and the arc edge segments and the trimming segments are alternately connected, and the trimming segments and the tooth portions are arranged correspondingly, and the plurality of trimming segments include a plurality of first trimming edges, and the first trimming edges are provided with a plurality of first notches and a plurality of second notches, the area of ​​the first notch is S1, and the area of ​​the second notch is S2, and S1 and S2 satisfy 0.21≤S1 / S2≤0.49.

[0017] The utility model also proposes a compressor, which includes a motor, and the motor includes a stator punching sheet. The stator punching sheet includes a yoke and a plurality of tooth portions, and the plurality of tooth portions are arranged at intervals on the inner circumferential surface of the yoke; wherein the yoke includes a plurality of arc edge segments and a plurality of trimming segments, and the arc edge segments and the trimming segments are alternately connected, and the trimming segments and the tooth portions are arranged correspondingly, and the plurality of trimming segments include a plurality of first trimming edges, and the first trimming edges are provided with a plurality of first notches and a plurality of second notches, the area of ​​the first notch is S1, and the area of ​​the second notch is S2, and S1 and S2 satisfy 0.21≤S1 / S2≤0.49.

[0018] The technical solution of the utility model adopts the method of arranging the first notch and the second notch on the first cutting edge of the stator punching sheet, thereby preventing the stator from being heated and causing structural deformation during the process of being installed in cooperation with the housing, thereby reducing the iron loss of the stator. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] 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.

[0020] Figure 1 A structural schematic diagram of an embodiment of a stator punching sheet provided by the utility model;

[0021] Figure 2 for Figure 1 A partial enlarged view of the middle A;

[0022] Figure 3 for Figure 1 A schematic structural diagram of another embodiment;

[0023] Figure 4 It is a schematic diagram of the iron loss distribution of the stator punching comparison scheme;

[0024] Figure 5 It is a schematic diagram of the iron loss distribution of the stator punching sheet of the utility model.

[0025] Description of Figure Numbers:

[0026] 100, stator punching sheet; 1, yoke; 11, trimming section; 111, first trimming; 111a, first notch; 111b, second notch; 111c, third notch; 112, second trimming; 112a, fourth notch; 113, third trimming; 113a, positioning opening; 12, arc edge section; 2, tooth section.

[0027] 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

[0028] 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.

[0029] 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.

[0030] 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.

[0031] Compressor motors are widely used in various refrigeration and air-conditioning systems and are the core of refrigeration and air-conditioning systems. During the installation process, the stator and the housing of the motor in the compressor need to be shrink-fitted and extruded, which may cause the outer circumference of the stator to deform due to compressive stress, thereby increasing iron loss and reducing the performance of the motor and compressor.

[0032] It should be noted that the motor of the compressor and its casing are matched through the shrink fitting process. Generally, the casing is sleeved on the outside of the stator component by interference fit. During the shrink fitting process, the stator may expand due to heat, and then be affected by tensile pressure or compressive stress, causing the stator structure to deform, especially the part of the stator close to the stator teeth. The deformation of the stator will change the distribution of the magnetic field, resulting in an uneven or over-concentrated magnetic field. This uneven magnetic field distribution will cause the magnetic flux distribution in the stator core to be uneven, increasing hysteresis loss and eddy current loss. Secondly, the deformation of the stator structure may lead to an increase in the motor load, thereby increasing the temperature of the motor. In a high temperature environment, the resistivity of the core material will increase, and the conductivity will decrease, thereby increasing the iron loss. In addition, high temperature may also cause the magnetization performance of the core material to decrease, further increasing the iron loss.

[0033] First, iron loss will cause the efficiency of the motor to decrease. The motor efficiency is determined by the ratio of the motor loss to the output power. As part of the motor loss, the increase of iron loss will lead to a decrease in the overall efficiency of the motor. When the motor efficiency decreases, the motor will have more energy loss in the process of converting electrical energy to mechanical energy, which will directly affect the motor's operating performance.

[0034] Secondly, iron loss will generate heat, causing the motor temperature to rise. If the temperature rise is too high, it may exceed the motor's design temperature range, causing a series of problems. For example, high temperature may age the insulation material inside the motor, shortening the motor's service life. High temperature may also cause the thermal expansion coefficient of the motor's internal materials to be different, causing structural deformation and stress concentration, further reducing the motor's performance.

[0035] In addition, increased iron loss may also affect the stability and reliability of the motor. Due to the heat and stress changes generated by iron loss, the motor may experience vibration, noise and other problems during operation, which will not only affect the smooth operation of the motor, but may also damage other parts of the motor and reduce the reliability of the motor.

[0036] In summary, increased iron loss will reduce the performance of the motor, mainly manifested in reduced efficiency, excessive temperature rise, reduced stability and reliability, etc. Therefore, in the design and manufacturing process of the motor, measures need to be taken to reduce iron loss in order to improve the performance and reliability of the motor.

[0037] In view of this, the present invention proposes a stator punching sheet 100, aiming to reduce the iron loss of the motor.

[0038] See also Figure 1 In one embodiment of the utility model, the stator punching sheet 100 includes a yoke 1 and a plurality of tooth portions 2, and the plurality of tooth portions 2 are arranged at intervals on the inner circumferential surface of the yoke 1; wherein the yoke 1 includes a plurality of arc edge segments 12 and a plurality of trimming segments 11, and the arc edge segments 12 and the trimming segments 11 are alternately connected, and the trimming segments 11 and the tooth portions 2 are arranged correspondingly, and the plurality of trimming segments 11 include a plurality of first trimming edges 111, and the first trimming edges 111 are provided with a plurality of first notches 111a and a plurality of second notches 111b, and the area of ​​the first notch 111a is S1, and the area of ​​the second notch 111b is S2, and S1 and S2 satisfy 0.21≤S1 / S2≤0.49.

[0039] Specifically, the stator punching sheet 100 includes a yoke 1 and a plurality of teeth 2, wherein the plurality of teeth 2 are arranged at intervals on the inner circumference of the yoke 1, and the plurality of teeth 2 and the yoke 1 are integrally stamped. In the previous technical solution, the outer periphery of the yoke 1 is generally set as an arc edge, while in this embodiment, the yoke 1 includes a plurality of arc edge segments 12 and a plurality of trimming segments 11, and the arc edge segments 12 and the trimming segments 11 are alternately connected. This design helps to reduce the stress concentration phenomenon of the stator punching sheet 100 under the action of electromagnetic force and mechanical stress.

[0040] During the operation of the motor, the stator punching sheet 100 will be affected by other forces from the electromagnetic field and mechanical components. If the periphery of the punching sheet adopts a right-angle design, the stress generated at the right angle is easily too concentrated, resulting in deformation, cracking and other problems of the punching sheet. The design of the arc edge segment 12 and the trimming segment 11 can make the stress distribution more uniform. Secondly, the design of multiple arc edge segments 12 and multiple trimming segments 11 makes the stator punching sheet 100 transition more smoothly in the magnetic field, reduces the non-uniformity of the magnetic field, reduces the noise and vibration during the operation of the motor, and helps to improve the operating efficiency and stability of the motor.

[0041] Considering that the position of the yoke 1 corresponding to the tooth portion 2 is more likely to be deformed by heat, the trimming section 11 is arranged corresponding to the tooth portion 2, so that the position of the yoke 1 corresponding to the tooth portion 2 can be prevented from being deformed during the shrink fitting process. Among them, the trimming section 11 includes a plurality of first trimming edges 111, and the number of the first trimming edges 111 can be one, two, or more. In this embodiment, the number of the first trimming edges 111 is set to three. A plurality of first notches 111a and a plurality of second notches 111b are provided on the first trimming edge 111, and the number of the first notches 111a and the second notches 111b is not specifically limited here. Among them, the first notch 111a and the second notch 111b have different areas, and the area of ​​the second notch 111b is greater than the area of ​​the first notch 111a, specifically 0.21≤S1 / S2≤0.49. Within this range, the setting of the first notch 111a and the second notch 111b can prevent the stator punching sheet 100 from being subjected to stress deformation during the assembly process with the housing.

[0042] See also Figure 4 and Figure 5 ,in Figure 4 This is a schematic diagram of the iron loss distribution of the stator punching comparison scheme. Figure 5 This is a schematic diagram of the iron loss distribution of the stator lamination proposed in the utility model. It can be seen that Figure 5 The color near the first notches 111a and the second notches 111b is darker. Figure 4 In the embodiment, only one notch is provided at the same position and the color is lighter, so a plurality of first notches 111a and a plurality of second notches 111b are provided, which has lower iron loss than the comparative solution.

[0043] The technical solution of the utility model adopts a first notch 111a and a second notch 111b provided on the first cutting edge 111 of the stator punching sheet 100 to prevent the stator from being heated and causing structural deformation during the installation process with the housing, thereby reducing the iron loss of the stator and improving the operating efficiency of the motor.

[0044] Preferably, see Figures 1 to 3The number of the first notch 111a and the number of the second notch 111b are respectively set to two, and the two first notches 111a are located between the two second notches 111b.

[0045] According to the previous embodiment, the number of the first notches 111a and the number of the second notches 111b are several, that is, the number of the first notches 111a and the second notches 111b can be one, two, or more. In this embodiment, the number of the first notches 111a and the second notches 111b is two. Compared with the scheme of providing one first notch 111a and one second notch 111b, providing two first notches 111a and two second notches 111b respectively helps to further reduce the stress on the yoke 1. It is also considered that the area of ​​the first cutting edge 111 is limited, and it is not easy to open too many first notches 111a and second notches 111b, so only two first notches 111a and two first notches 111a are opened.

[0046] Furthermore, according to the above embodiment, the area of ​​the first notch 111a is smaller than the area of ​​the second notch 111b, and the two first notches 111a are arranged between the second notches 111b, so that the overall structural reliability of the first cutting edge 111 is better.

[0047] Optionally, in one embodiment, see Figure 2 and Figure 3 The first cutting edge 111 is further provided with a third notch 111c, and the third notch 111c is located between the two first notches 111a.

[0048] Considering that in order to further disperse the tensile stress or compressive stress of the first cutting edge 111 after heating, a third notch 111c is opened in the first cutting edge 111, wherein the area of ​​the third notch 111c can be larger than the first notch 111a or smaller than the first notch 111a, without specific limitation here.

[0049] Further, in one embodiment, please continue to refer to Figure 2 and Figure 3 , the area of ​​the third notch 111c is S3, and S3 and S2 satisfy S2≤S3≤2S2.

[0050] According to the previous embodiment, a third notch 111c is provided between the two first notches 111a. In order to make the third notch 111c have a better effect of reducing iron loss, the area of ​​the third notch 111c is limited to be larger than the area of ​​the second notch 111b. Due to the area of ​​the first cut edge 111, the area of ​​the third notch 111c cannot be larger than twice the area of ​​the second notch 111b.

[0051] In one embodiment, please continue to refer to Figure 2 and Figure 3 The two first notches 111 a and the two second notches 111 b are symmetrically distributed on opposite sides of a vertical line passing through the midpoint of the trimming section 11 .

[0052] Specifically, in this embodiment, by limiting the symmetrical arrangement of the two first notches 111a and the symmetrical arrangement of the two second notches 111b, the structural strength of the first cutting edge 111 is improved. Such a design can make the distribution of the electromagnetic field more uniform, which helps to reduce the iron loss of the stator punching sheet 100 and improve the operating efficiency of the motor.

[0053] In a preferred embodiment, see Figure 3 The adjacent first notch 111a and the second notch 111b respectively form a first angle θ1 with the line connecting the center of the stator punching sheet 100, and the θ1 satisfies 2.5°≤θ1≤4.5°; the adjacent second notch 111b and the third notch 111c respectively form a second angle θ2 with the line connecting the center of the stator punching sheet 100, and the θ2 satisfies 5°≤θ2≤7°.

[0054] In this embodiment, by limiting the angular range of the first angle and the second angle, the distance between the first notch 111a and the second notch 111b, and the distance between the second notch 111b and the third notch 111c are indirectly limited. Within this range, it helps to reduce the iron loss of the stator punching sheet 100 and improve the operating efficiency of the motor.

[0055] In one embodiment, see Figure 1 , the width of the tooth portion 2 is bt, the length of the first cutting edge 111 is b, and the bt and b satisfy 1.62bt≤b≤2.65bt.

[0056] It should be noted that, in the above embodiment, the first cutting edge 111 is arranged corresponding to the tooth portion 2, wherein the length of the first cutting edge 111 may be greater than the width of the tooth portion 2, or the length of the first cutting edge 111 may be less than the width of the tooth portion 2. In the present embodiment, the width of the first cutting edge 111 is greater than the width of the tooth portion 2, so the second notch 111b may be on the outside of the tooth portion 2 in the radial direction, or on the inside of the tooth portion 2 in the radial direction. The first cutting edge 111 and the width of the tooth portion 2 are within the above relationship range, which helps to reduce the iron loss of the stator punching sheet 100 and improve the operating efficiency of the motor.

[0057] Optionally, in one embodiment, see Figure 1 The plurality of trimming sections 11 further include a plurality of second trimming edges 112 , any of the second trimming edges 112 being adjacent to the first trimming edge 111 in the circumferential direction of the yoke 1 , and the second trimming edge 112 being provided with a fourth notch 112 a .

[0058] On the basis of the above embodiment, the trimming section 11 further includes a plurality of second trimming edges 112, wherein the length of the second trimming edge 112 may be the same as the length of the first trimming edge 111, may be greater than the length of the first trimming edge 111, or may be less than the length of the first trimming edge 111. The function of the second trimming edge 112 is the same as that of the first trimming edge 111, and has the function of preventing the stator punching sheet 100 from being deformed by heat, wherein the fourth notch 112a may also reduce the iron loss of the stator punching sheet 100 and improve the operating efficiency of the motor.

[0059] In one embodiment, see Figure 1 The plurality of trimming sections 11 further include a plurality of third trimming edges 113 , any of the third trimming edges 113 is located between the first trimming edge 111 and the second trimming edge 112 in the circumferential direction of the yoke 1 , and the third trimming edge 113 is provided with a positioning opening 113 a .

[0060] On the basis of the above embodiment, the trimming section 11 further includes a plurality of third trimming edges 113, wherein the length of the third trimming edge 113 may be the same as the length of the first trimming edge 111, may be greater than the length of the first trimming edge 111, or may be less than the length of the first trimming edge 111. The function of the third trimming edge 113 is the same as that of the first trimming edge 111, and is used to prevent the stator punching sheet 100 from being deformed due to heat, wherein the positioning opening 113a is used to position the stator punching sheet 100, so as to facilitate the positioning of the stator and the assembly of other components.

[0061] 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.

[0062] The utility model also proposes a compressor, which includes a motor, and the motor includes a stator punching 100. The specific structure of the stator punching 100 refers to the above embodiment. Since the compressor 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 repeated here. The above is only an exemplary implementation of the utility model, and does not limit the patent scope of the utility model. All equivalent structural changes made by using the contents of the utility model specification and drawings under the technical concept of the utility model, or directly / indirectly used in other related technical fields are included in the patent protection scope of the utility model.

Claims

1. A stator punching sheet, characterized in that: include: yoke; A plurality of teeth are arranged at intervals on the inner circumference of the yoke; Wherein, the yoke portion includes a plurality of arc edge segments and a plurality of trimming edge segments, the arc edge segments and the trimming edge segments are alternately connected, the trimming edge segments and the tooth portions are arranged correspondingly, the plurality of trimming edge segments include a plurality of first trimming edges, the first trimming edges are provided with a plurality of first notches and a plurality of second notches, the area of ​​the first notch is S1, the area of ​​the second notch is S2, and S1 and S2 satisfy 0.21≤S1 / S2≤0.

49.

2. The stator sheet according to claim 1, characterized in that: The number of the first notches and the number of the second notches are respectively set to two, and the two first notches are located between the two second notches.

3. The stator sheet according to claim 2, characterized in that: The first cutting edge is further provided with a third notch, and the third notch is located between the two first notches.

4. The stator sheet according to claim 3, characterized in that: The area of ​​the third gap is S3, and S3 and S2 satisfy S2≤S3≤2S2.

5. The stator sheet according to claim 3, characterized in that: The two first notches and the two second notches are symmetrically distributed on opposite sides of a vertical line passing through the midpoint of the trimming section.

6. The stator sheet according to claim 5, characterized in that: The adjacent first notch and the second notch respectively form a first angle θ1 with the line connecting the center of the stator punching sheet, and θ1 satisfies 2.5°≤θ1≤4.5°; the adjacent second notch and the third notch respectively form a second angle θ2 with the line connecting the center of the stator punching sheet, and θ2 satisfies 5°≤θ2≤7°.

7. The stator sheet according to claim 3, characterized in that: The width of the tooth portion is bt, the length of the first cutting edge is b, and bt and b satisfy 1.62bt≤b≤2.65bt.

8. The stator sheet according to claim 3, characterized in that: The plurality of trimming sections further include a plurality of second trimmings, any of the second trimmings being adjacent to the first trimming in the circumferential direction of the yoke, and the second trimming is provided with a fourth notch.

9. The stator sheet according to claim 8, characterized in that: The plurality of trimming sections further include a plurality of third trimmings, any of the third trimmings being located between the first trimming and the second trimming in the circumferential direction of the yoke, and the third trimming is provided with a positioning opening.

10. A motor, characterized in that: The invention comprises a stator sheet as claimed in any one of claims 1 to 9.

11. A compressor, characterized in that: Comprising the motor as claimed in claim 10.

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