A motor, compressor and refrigerator

Abstract

The application provides a motor, a compressor and a refrigerator, comprising a stator, the stator comprising a middle stator and two end stators, the middle stator being arranged between the two end stators, and a plurality of middle stator teeth being uniformly arranged on the inner side of the middle stator in the circumferential direction, and a recess hole being arranged on the same side of each middle stator tooth.The beneficial effects of the application are that the magnetic density distribution of the stator tooth part is improved by optimizing the position, size and other parameters of the recess hole, the magnetic field strength of the stator tooth part is adjusted, the utilization rate of the material of the stator tooth part is improved, the material consumption of the stator is reduced, and the cost of the motor is reduced while ensuring the low-frequency operation efficiency of the motor and meeting the energy efficiency requirements of the compressor.

Description

Technical Field

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

[0002] In refrigerator applications, piston compressors only require a lower operating frequency and a lower workload to meet the refrigeration needs of the refrigerator. Under these application conditions and background, the efficiency of the piston compressor motor needs to be improved to enhance the overall performance of the compressor.

[0003] Existing piston compressor motors use ferrite magnets with low residual magnetism as excitation materials. To improve the low-frequency performance of the motor, the amount of magnets used needs to be increased to increase the effective area of ​​the magnets, thereby increasing the magnetic flux of the motor. As a result, the height of the rotor magnets will be higher than the height of the stator core. In this case, the magnetic flux density at the stator end increases, resulting in a low magnetic conductivity utilization rate of the core material in the middle part of the stator. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide an electric motor, a compressor and a refrigerator to solve the technical problem of low magnetic conductivity utilization of the iron core material in the middle part of the stator of the existing electric motor.

[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, and each middle stator tooth having a recessed hole on the same side.

[0006] Furthermore, the recessed holes are arc-shaped, and the distance from the center of each recessed hole to the center of the central stator is the same.

[0007] Furthermore, the angle between the center of the recessed hole and the central axis of the current middle stator tooth is α1, and the angle between the central axes of adjacent middle stator teeth is α, where α = 360 / s, s is the number of slots of the motor, and α / 20 < α1 < α / 10.

[0008] Furthermore, the distance from the center of the recessed hole to the center of the central stator is R1, the outer diameter of the central stator is R2, and the inner diameter of the central stator is R, wherein 1.1R <R1<R2 2 -R 2 And R <R1<R2。

[0009] Furthermore, the width of the central stator tooth is L, the depth of the recessed hole is δ1, the radius of the recessed hole is r, the angle between the center of the recessed hole and the central axis of the current central stator tooth is α1, and the distance from the center of the recessed hole to the center of the central stator is R1, where r = sinα1 + δ1 - L, and 1 <r<R1 / 2。

[0010] 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.

[0011] Furthermore, the height of the end stator along the axial direction is h2, where h = h1 + h2 + h2.

[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 electric motor, including a stator, which comprises a central stator and two end stators. The central stator is disposed between the two end stators. The inner side of the central stator is uniformly provided with a plurality of central stator teeth along the circumferential direction. Each central stator tooth has a recessed hole on the same side. By optimizing the position, size and other parameters of the recessed holes, the magnetic flux density distribution of the stator teeth is improved, and the magnetic field strength of the stator teeth is adjusted. While ensuring the low-frequency operation efficiency of the motor and meeting the energy efficiency requirements of the compressor, the utilization rate of the stator tooth material is improved, the amount of material used in the stator is reduced, and the cost of the motor is reduced. 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 5This 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 motor efficiency as a function of the depth of the recessed hole in this invention.

[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; 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 the same side.

[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 each central stator tooth 111 has a boot portion 113. By providing recessed holes 112 on the central stator teeth 111, the width of the central stator teeth 111 is changed, thereby improving 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 positioned 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 stator 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. One side of the central stator tooth 111 is provided with a recessed hole 112, which forms an inwardly recessed groove in the axial direction of the stator tooth area. This effectively improves the uniformity of the magnetic flux density distribution in the axial direction of the stator and increases the material utilization rate. At the same time, by setting a recessed groove in the stator tooth area, the material usage is reduced, which reduces the manufacturing cost of the motor stator to a certain extent.

[0038] In one possible implementation, the recessed holes 112 are arc-shaped, and the distance from the center of each recessed hole 112 to the center of the central stator 11 is the same.

[0039] In this embodiment, the structure of the recessed hole 112 has been optimized. Specifically, the recessed hole 112 is an arc-shaped structure, which is part of the circle that intersects and combines with the central stator tooth 111. The arc-shaped recessed hole structure can ensure the machining accuracy while facilitating the processing and production of the stator, thereby improving the completion rate of the lamination core.

[0040] In one possible implementation, the angle between the center of the recessed hole and the central axis of the current middle stator tooth is α1, and the angle between the central axes of adjacent middle stator teeth is α, where α = 360 / s, s is the number of slots of the motor, and the condition α / 20 < α1 < α / 10 is satisfied.

[0041] In this embodiment, the angle parameter between the center of the recessed hole and the central axis of the current middle stator tooth was optimized. Specifically, the relationship between the angle between the center of the recessed hole and the central axis of the current middle stator tooth and the angle between the central axes of adjacent middle stator teeth was configured as follows: α / 20 < α1 < α / 10. By reasonably changing the angle between the center of the recessed hole and the central axis of the current middle stator tooth, the position of the recessed hole on the middle stator tooth is changed, thereby changing the width parameter of the middle stator tooth 111. This improves the uniformity of magnetic flux density distribution in the tooth region of the stator, thereby increasing material utilization and reducing material usage in the tooth region of the stator, thus reducing the manufacturing cost of the motor stator.

[0042] In a possible embodiment, the distance from the center of the recessed hole to the center of the middle stator is R1, the outer diameter of the middle stator (11) is R2, the inner diameter of the middle stator (11) is R, wherein 1.1R<R1<R2 2 -R 2 , and R<R1<R2.

[0043] In this embodiment, the parameters of the distance from the center of the recessed hole to the center of the middle stator, the outer diameter of the middle stator (11) and the inner diameter of the middle stator (11) are optimized. It should be noted that the inner diameter of the middle stator (11) is the distance from the inner surface of the shoe portion (113) to the center of the middle stator. Specifically, the relationship among the distance from the center of the recessed hole to the center of the middle stator, the outer diameter of the middle stator and the inner diameter of the middle stator is configured as: 1.1R<R1<R2 2 -R 2 , and R<R1<R2. By reasonably changing the parameter of the distance from the center of the recessed hole to the center of the middle stator, the position of the recessed hole (112) on the middle stator tooth (111) is changed, thereby changing the depth of the recessed hole (112) on the middle stator tooth (111), further changing the width parameter of the middle stator tooth (111), and thus adjusting the material consumption of the middle stator tooth (111). By changing the depth of the recessed hole (112) on the middle stator tooth (111), the material utilization rate of the middle stator tooth (111) is improved, and the effect of increasing the amplitude of magnetic density variation can be achieved with less material.

[0044] In a possible embodiment, the width of the middle stator tooth (111) is L, the hole depth of the recessed hole (112) is δ1, the radius of the recessed hole (112) is r, the included angle between the center of the recessed hole and the central axis of the current middle stator tooth is α1, the distance from the center of the recessed hole to the center of the middle stator is R1, wherein r=sinα1+δ1-L, and 1<r<R1 / 2.

[0045] In this embodiment, the distance between the two side surfaces of the middle stator tooth 111 is the width L of the middle stator tooth 111. A tangent line is drawn to the arc-shaped recessed hole such that the tangent line is parallel to the side surface of the middle stator tooth, and the distance from the tangent line to the side surface of the middle stator tooth is the hole depth δ1 of the recessed hole 112. The parameters including the distance from the center of the recessed hole to the center of the middle stator, the included angle between the center of the recessed hole and the central axis of the current middle stator tooth, the hole depth of the recessed hole and the width of the middle stator tooth are optimized. Specifically, the relationship among the distance from the center of the recessed hole to the center of the middle stator, the included angle between the center of the recessed hole and the central axis of the current middle stator tooth, the hole depth of the recessed hole and the width of the middle stator tooth is configured as: r=sinα1+δ1-L, and 1<r<R1 / 2. By reasonably changing the parameters of the distance from the center of the recessed hole to the center of the middle stator and the included angle between the center of the recessed hole and the central axis of the current middle stator tooth, the hole depth parameter of the recessed hole on the middle stator tooth is changed, thereby changing the parameter of δ1 / L, and thus changing the material consumption of the middle stator tooth 111.

[0046] Please refer to Figure 6 , when 0.015<δ1 / L<0.09, the effective utilization rate of the material in the tooth area of the stator increases as δ1 continuously increases. When the value of δ1 / L exceeds 0.09, the effective utilization rate of the material in the tooth area of the stator decreases as δ1 continuously increases. And within the range of 0.015<δ1 / L<0.18, the effective utilization rate of the stator tooth material is still improved compared with the prior art. By changing the depth of the recessed hole 112 on the middle stator tooth 111, the material utilization rate of the middle stator tooth 111 is improved, and the effect of using less material and obtaining an increased amplitude of magnetic density variation is achieved.

[0047] In a possible implementation, the axial height of the stator 1 is h, the axial height of the middle stator 11 is h1, and the axial height of the end stator 12 is h2, wherein h=h1+h2+h2, and 0.01≤h1 / h≤0.5.

[0048] In this embodiment, the axial height parameters of the stator 1, the middle stator 11 and the end stator 12 are optimized. Specifically, the relationship between the axial height of the middle stator 11 and the axial height of the stator 1 is configured as 0.01≤h1 / h≤0.5, and h=h2+h1+h2. Through the selection of the height of the middle stator 11, the proportion of iron loss of the motor can be balanced, which can ensure that the manufacturing cost of the motor is reduced while the motor efficiency is basically unchanged. Please refer to Figure 7 , when the height of the middle stator 11 is within the selected range, as the hole depth δ1 of the recessed hole 112 increases, the variation range of the motor efficiency does not exceed 0.2%, so that the manufacturing cost of the motor is reasonably reduced under the condition that the motor efficiency is basically unchanged.

[0049] Please see Figure 8 When 0.01≤h1 / h≤0.2, the material saving of the stator teeth of the middle stator 11 increases with the continuous increase of δ1. In the range of 0.05<δ1 / L<0.18, the material saving of the stator teeth of the middle stator 11 decreases by 1.4%-10%.

[0050] Please see Figure 9 When 0.02

[0051] In one possible implementation, a rotor is also included, which is disposed inside the stator and is rotatable relative to the stator, wherein the axial height of the rotor is greater than the axial height of the stator.

[0052] 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.

[0053] As can be seen from the above description, the beneficial effects of the present invention are as follows: a motor is provided, including a stator, the stator comprising a central stator and two end stators, the central stator being disposed between the two end stators, and a plurality of central stator teeth being uniformly arranged along the circumferential direction on the inner side of the central stator, each central stator tooth having a recessed hole on the same side, thereby improving the magnetic flux density distribution of the stator teeth and adjusting the magnetic field strength of the stator teeth by optimizing the position, size and other parameters of the recessed holes, thus ensuring the low-frequency operation efficiency of the motor and meeting the energy efficiency requirements of the compressor, while improving the utilization rate of the stator tooth material, reducing the amount of stator material used, and lowering the cost of the motor.

[0054] 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.

[0055] 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. ​

[0056] 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 based on the content of the present invention 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, characterized in that: The inner side of the central stator is provided with a plurality of central stator teeth evenly arranged along the circumferential direction, and each central stator tooth is provided with a recessed hole on the same side. The recessed holes are arc-shaped, and the distance from the center of each recessed hole to the center of the central stator is the same. The distance from the center of the recessed hole to the center of the central stator is R1, the outer diameter of the central stator is R2, and the inner diameter of the central stator is R, where 1.1R <R1< And R <R1<R2。 2. The motor according to claim 1, characterized in that: The angle between the center of the recessed hole and the central axis of the current middle stator tooth is α1, and the angle between the central axes of adjacent middle stator teeth is α, where α = 360 / s, s is the number of slots of the motor, and α / 20 < α1 < α / 10.

3. The motor according to claim 1, characterized in that: The width of the central stator tooth is L, the depth of the recessed hole is δ1, the radius of the recessed hole is r, the angle between the center of the recessed hole and the central axis of the current central stator tooth is α1, and the distance from the center of the recessed hole to the center of the central stator is R1. , and 1 <r<R1 / 2。 4. The motor according to claim 1, characterized in that: 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.

5. The motor according to claim 4, 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: 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.

7. A compressor, characterized in that: Including the motor as described in any one of claims 1-6.

8. A refrigerator, characterized in that: Includes the compressor as described in claim 7.

Images