A motor, compressor and refrigerator

Abstract

The application provides a motor, a compressor and a refrigerator, comprising a stator, the stator comprises a middle stator and two end stators, the middle stator is arranged between the two end stators, the inner side of the middle stator is uniformly provided with a plurality of middle stator teeth in the circumferential direction, one recess hole is arranged on each side of each middle stator tooth, the width of the middle stator tooth is L, the hole depth of the recess hole is delta 1, and 0.015 < delta 1 / L < 0.18. The application has the beneficial effect that an unequal height motor for the working condition requirement characteristics of the compressor is provided, the low frequency performance is used, the tooth width of the middle stator of the motor is changed, the tooth magnetic density distribution of the stator is improved, the silicon steel sheet permeability of the stator is improved, the material utilization rate is improved, meanwhile, the amount of the stator tooth material is reduced, and the manufacturing cost of the stator is saved to a certain extent.

Description

Technical Field

[0001] This invention relates to the field of motor structure technology, and in particular to a motor, compressor, and refrigerator. Background Technology

[0002] In the traditional refrigerator piston compressor industry, piston compressor motors use ferrite as the excitation material. Due to its material properties, ferrite has the characteristic of low residual magnetism. In order to provide sufficient excitation effect, a rotor and stator unequal height structure is adopted, with the axial height of the rotor being higher than that of the stator. This increases the amount of rotor magnets and improves the low-frequency performance of the motor.

[0003] However, due to the end effect, the magnetic field is more likely to concentrate on the stator end face, resulting in a lower magnetic conductivity utilization rate of the core material in the middle part of the stator. At the same time, it increases the cost of stator tooth material, which is not conducive to controlling the manufacturing cost of the stator. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a motor, compressor and refrigerator with a reasonable structure that can reduce the amount of silicon steel sheets used.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows: an electric motor, including a stator, the stator including a middle stator and two end stators, the middle stator being disposed between the two end stators, the inner side of the middle stator being uniformly provided with a plurality of middle stator teeth along the circumferential direction, each middle stator tooth having a recessed hole on each side, the width of the middle stator tooth being L, and the depth of the recessed hole being δ1, wherein 0.015 < δ1 / L < 0.18.

[0006] Furthermore, the recessed hole includes an arc-shaped first hole edge and an arc-shaped second hole edge, the first hole edge being disposed near the outer side of the stator teeth, and the second hole edge being disposed near the inner side of the stator teeth.

[0007] Furthermore, both the first hole edge and the second hole edge are concentric with the center of the central stator.

[0008] Furthermore, the radius of the first hole position edge is R1, the radius of the second hole position edge is R2, the outer diameter of the middle stator is R3, and the inner diameter of the middle stator is R, wherein 0.99 < (R1-R2) / R*R3 < 10.99, and R3 > R1 > R2 > R.

[0009] Furthermore, the axial height of the stator is h, and the axial height of the middle stator is h1, wherein 0.01≤h1 / h≤0.5.

[0010] Furthermore, the height of the end stator along the axial direction is h2, where h = h1 + h2 + h2.

[0011] Furthermore, the recessed holes on both sides of the central stator tooth are symmetrical about the central axis of the central stator tooth.

[0012] Furthermore, it also includes a rotor, which is disposed inside the stator, and the axial height of the rotor is greater than the axial height of the stator.

[0013] The present invention also relates to a compressor comprising a motor as described in any of the preceding claims.

[0014] The present invention also relates to a refrigerator, including the compressor as described above.

[0015] The beneficial effects of this invention are as follows: It provides an unequal-height motor that is designed for the operating conditions of compressors and focuses on low-frequency performance. By changing the width of the teeth in the middle of the stator, the magnetic flux density distribution of the stator teeth is improved, the permeability of the silicon steel sheets of the stator is increased, and the material utilization rate is improved. At the same time, the amount of stator tooth material used is reduced, which saves stator manufacturing costs to a certain extent. Attached Figure Description

[0016] The specific structure of the present invention will be described in detail below with reference to the accompanying drawings:

[0017] Figure 1 This is an exploded structural diagram of the stator of the motor of the present invention;

[0018] Figure 2 This is a schematic diagram of the middle stator structure of the motor of the present invention;

[0019] Figure 3 for Figure 2 A magnified structural diagram of part A in the middle;

[0020] Figure 4 This is a schematic diagram of the axial structure of the stator of the motor of the present invention;

[0021] Figure 5 This is a schematic diagram of the assembly structure of the stator and rotor of the motor of the present invention;

[0022] Figure 6 This is a schematic diagram showing the relationship between the stator tooth utilization rate of the motor of the present invention and δ1 / L;

[0023] Figure 7 This is a schematic diagram showing the trend of the efficiency of the motor of the present invention as a function of the gap between the recessed holes;

[0024] Figure 8 This is a schematic diagram illustrating the cost reduction trend of the middle stator of the motor according to one embodiment of the present invention.

[0025] Figure 9 This is a schematic diagram illustrating the cost reduction trend of the middle stator in another embodiment of the motor of the present invention.

[0026] 1-Stator;

[0027] 11-Central stator; 111-Central stator tooth; 112-Recessed hole; 1121-First hole edge; 1122-Second hole edge; 113-Shoe part;

[0028] 12-End stator;

[0029] 2-Rotor. Detailed Implementation

[0030] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0031] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0032] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more features. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0033] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0034] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0035] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. The illustrative expressions of the above terms in this specification should not be construed as necessarily referring to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. In addition, those skilled in the art can combine and integrate the different embodiments or examples described in this specification.

[0036] Please see Figures 1 to 5 This embodiment provides an electric motor, including a stator 1. The stator 1 includes a central stator 11 and two end stators 12. The central stator 11 is disposed between the two end stators 12. The inner side of the central stator 11 is uniformly provided with a plurality of central stator teeth 111 along the circumferential direction. Each central stator tooth 111 has a recessed hole 112 on each side. The width of the central stator tooth 111 is L, and the depth of the recessed hole 112 is δ1, wherein 0.015 < δ1 / L < 0.18.

[0037] In this embodiment, a plurality of central stator teeth 111 are uniformly arranged along the circumferential direction on the inner side of the central stator 11. The inner end of the central stator teeth 111 is connected to a shoe portion 113. The width of the central stator teeth 111 is changed by the recessed holes 112 to improve the problem of uneven magnetic flux distribution in the tooth region of the stator. Specifically, the stator 1 of the motor is configured as a combination of at least one central stator 11 and two end stators 12. The central stator 11 and the two end stators 12 are stacked along the axial direction of the motor, and the central stator 11 is disposed between the two end stators 12 to form a sandwich structure. A plurality of end stator teeth are uniformly arranged along the circumferential direction on the inner side of the end stators 12. The end stator teeth and the central stator teeth 111 are stacked along the axial direction of the motor to form the tooth region of the stator. A recessed hole 112 is provided on each side of the central stator teeth 111, and the two recessed holes 112 are symmetrical about the central axis of the current central stator teeth 111. This design creates concave grooves in the stator's tooth region along the axial direction, effectively improving the uniformity of magnetic flux density distribution and increasing material utilization. Simultaneously, by incorporating these grooves in the stator's tooth region, material usage is reduced, thus lowering the manufacturing cost of the motor stator to some extent.

[0038] In this embodiment, the width of the central stator tooth 111 and the depth of the recessed hole 112 were optimized. Specifically, the ratio of the depth of the recessed hole 112 to the width of the central stator tooth 111 was configured to be 0.015 < δ1 / L < 0.18, which can reasonably reduce the tooth width of the central stator 11 in the axial direction, thereby improving the uniformity of magnetic flux density distribution in the tooth area of ​​the stator.

[0039] By selecting the appropriate depth for the recessed hole 112, the effective utilization rate of material in the stator tooth region can be improved. Please refer to [link / reference needed]. Figure 6 When 0.015 < δ1 / L < 0.09, the effective utilization rate of the stator tooth region material increases with the continuous increase of δ1. When the value of δ1 / L exceeds 0.09, the effective utilization rate of the stator tooth region material decreases with the continuous increase of δ1. However, in the range of 0.015 < δ1 / L < 0.18, the effective utilization rate of the stator tooth material is still improved compared with the existing technology.

[0040] In one possible implementation, the recessed hole 112 includes an arc-shaped first hole edge 1121 and an arc-shaped second hole edge 1122. The first hole edge 1121 is disposed near the outer side of the stator tooth 111, and the second hole edge 1122 is disposed near the inner side of the stator tooth 111. Both the first hole edge 1121 and the second hole edge 1122 are concentric with the center of the central stator 11.

[0041] In this embodiment, the structure of the recessed hole 112 has been optimized. Specifically, the recessed hole 112 includes a first hole edge 1121, a second hole edge 1122, and a bottom edge. Both the first and second hole edges 1121 are arc-shaped. The bottom edge of the recessed hole is parallel to the side of the stator tooth 111, and the distance from the bottom edge of the recessed hole to the side of the stator tooth 111 is the hole depth δ1 of the recessed hole 111. The arc corresponding to the arc-shaped first hole edge 1121 has a center, and the arc corresponding to the arc-shaped second hole edge 1122 has a center. The centers of the first and second hole edges are concentric with the center of the annular central stator. This reduces the impact of the recessed hole 112 on the magnetic flux density of the stator yoke and ensures the uniformity of the magnetic field in the stator yoke.

[0042] In one possible implementation, the radius of the first hole edge 1121 is R1, the radius of the second hole edge 1122 is R2, the outer diameter of the middle stator 11 is R3, the inner diameter of the middle stator 11 is R, 0.99 < (R1-R2) / R*R3 < 10.99, and R3 > R1 > R2 > R.

[0043] In this embodiment, the parameters of the radius of the arc where the first hole edge 1121 is located, the radius of the arc where the second hole edge 1122 is located, the outer diameter of the middle stator 11, and the inner diameter of the middle stator 11 have been optimized. The inner diameter of the middle stator 11 is the distance from the inner surface of the boot portion 113 to the center of the middle stator. Specifically, the relationship between the radius of the first hole edge 1121, the radius of the second hole edge 1122, the outer diameter of the middle stator 11, and the inner diameter of the middle stator 11 is configured as 0.99 < (R1-R2) / R*R3 < 10.99, and R3 > R1 > R2 > R. Within this range, it can be ensured that the recessed hole 112 will not affect the magnetic flux density of the stator yoke, thus ensuring the uniformity of the magnetic field in the stator yoke.

[0044] In one possible implementation, the stator has an axial height of h, the middle stator 11 has an axial height of h1, and the end stator 12 has an axial height of h2, wherein h = h2 + h1 + h2, and 0.01 ≤ h1 / h ≤ 0.5.

[0045] In this embodiment, the axial height parameters of stator 1, the middle stator 11, and the end stator 12 were optimized. Specifically, the axial height of the middle stator 11 and the relationship between the axial height of the stator and the height of the middle stator 12 were configured as 0.01 ≤ h1 / h ≤ 0.5, and h = h2 + h1 + h2. By selecting the height of the middle stator, it can be ensured that the motor efficiency changes are small while reducing the manufacturing cost of the motor. Please refer to [link / reference]. Figure 7Within the selected range, as the depth δ1 of the recessed hole increases, the motor efficiency does not change by more than 0.2%, thus reasonably reducing the manufacturing cost of the motor while keeping the motor efficiency basically unchanged.

[0046] Please see Figure 8 When 0.01≤h1 / h≤0.2, the material saving of the stator teeth in the middle stator increases with the continuous increase of δ1. In the range of 0.05<δ1 / L<0.18, the material saving of the stator teeth in the middle stator decreases by 11%-28.82%.

[0047] Please see Figure 9 When 0.02

[0048] In one possible implementation, a rotor 2 is also included, which is disposed inside the stator 1 and is rotatable relative to the stator 1. The axial height of the rotor 2 is greater than the axial height of the stator 1.

[0049] In this embodiment, the use of a rotor and stator with unequal heights can provide sufficient excitation effect and improve the low-frequency performance of the motor. The rotor in this embodiment can be a surface-mounted magnet rotor structure, which can obtain better control performance; the rotor can also be a built-in magnet rotor structure, which can obtain better power density.

[0050] As can be seen from the above description, the beneficial effects of the present invention are as follows: It provides an unequal height motor that is designed for the operating conditions of compressors and focuses on low-frequency performance. By changing the size of the tooth width of the middle stator of the motor, the magnetic flux density distribution of the stator teeth is improved, the permeability of the silicon steel sheet of the stator is increased, the material utilization rate is improved, and at the same time, the amount of stator tooth material used is reduced, which saves the stator manufacturing cost to a certain extent.

[0051] The present invention also relates to a compressor, including a motor as described in any of the above embodiments. The specific structure of the motor is as described in the above embodiments. Since the compressor 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 in detail here.

[0052] ​The present invention also relates to a refrigerator, including a compressor as described above. The specific structure of the compressor is as described in the above embodiments. Since the refrigerator 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 in detail here.

[0053] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural or procedural transformations made using the content of the present invention's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. An electric motor, comprising a stator, the stator including a central stator and two end stators, the central stator being disposed between the two end stators, and the inner side of the central stator being uniformly provided with a plurality of central stator teeth along the circumferential direction, characterized in that: Each central stator tooth has a recessed hole on each side. The width of the central stator tooth is L, and the depth of the recessed hole is δ1, where 0.015 < δ1 / L < 0.

18. The height of the stator along the axial direction is h, and the height of the middle stator along the axial direction is h1, wherein 0.01≤h1 / h≤0.

5.

2. The motor according to claim 1, characterized in that: The recessed hole includes an arc-shaped first hole edge and an arc-shaped second hole edge. The first hole edge is located near the outer side of the stator teeth, and the second hole edge is located near the inner side of the stator teeth.

3. The motor according to claim 2, characterized in that: Both the first hole edge and the second hole edge are concentric with the center of the central stator.

4. The motor according to claim 3, characterized in that: The radius of the first hole position edge is R1, the radius of the second hole position edge is R2, the outer diameter of the middle stator is R3, and the inner diameter of the middle stator is R, wherein 0.99 < (R1-R2) / R*R3 < 10.99, and R3 > R1 > R2 > R.

5. The motor according to claim 1, characterized in that: The height of the end stator along the axial direction is h2, where h = h1 + h2 + h2.

6. The motor according to claim 1, characterized in that: The recessed holes on both sides of the central stator tooth are symmetrical about the central axis of the central stator tooth.

7. The motor according to claim 1, characterized in that: It also includes a rotor, which is disposed inside the stator, and the axial height of the rotor is greater than the axial height of the stator.

8. A compressor, characterized in that: Including the motor as described in any one of claims 1-7.

9. A refrigerator, characterized in that: Includes the compressor as described in claim 8.

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