An electric motor, a compressor, and an air conditioner

Abstract

This invention provides a motor, a compressor, and an air conditioner. The motor includes a housing and a motor structure. The motor structure includes a stator and a rotor. The rotor is rotatably fitted inside the stator, and the number of magnetic poles of the rotor is P, where P ≥ 10. The stator is fitted inside the housing and welded to the housing. The number of weld points on the stator to the housing is M1. The stator has S stator slots along its circumference, where S is a positive integer greater than or equal to 2. The greatest common divisor of S and P is N, where N > 4, and M1 ≠ n*N, where n is a positive integer. By setting M1 ≠ n*N (where n is a positive integer), such as setting 3 or 4 weld points for a 15-slot, 10-pole motor, this invention can prevent the stator modal vibration mode from resonating with the housing through the weld points, thereby avoiding abnormal motor noise. When the motor is used in a compressor, it can reduce abnormal compressor noise.

Description

Technical Field

[0001] This utility model belongs to the field of motor technology, specifically relating to a motor, a compressor, and an air conditioner. Background Technology

[0002] To address the vibration and noise issues arising from the miniaturization of variable frequency compressors, a common method is to weld the motor to the casing. This mitigates the increased iron loss and abnormal noise caused by deformation associated with traditional heat-shrink fitting methods. However, welding may result in the weld point coinciding with the modal vibration nodes of the casing, leading to abnormal vibration and noise. Utility Model Content

[0003] Therefore, this utility model provides a motor, a compressor, and an air conditioner, and the main technical problem to be solved is: how to reduce the vibration noise of the motor.

[0004] To address the aforementioned problems, this utility model provides an electric motor, comprising a housing and a motor structure. The motor structure includes a stator and a rotor. The rotor is rotatably fitted inside the stator, and the rotor has P magnetic poles, where P ≥ 10. The stator is fitted inside the housing and welded to the housing. The number of weld points on the stator that are welded to the housing is M1. The stator has S stator slots along its circumference, where S is a positive integer greater than or equal to 2.

[0005] The greatest common divisor of S and P is N, where N > 4, and M1 ≠ n * N, where n is a positive integer.

[0006] In some implementations, 6 ≥ M1 ≥ 3.

[0007] In some implementations, S = 15 and P = 10.

[0008] In some embodiments, the maximum outer diameter of the stator is D, and the minimum radial distance between each weld point on the stator that is welded to the housing and the bottom surface of the relative stator slot is H, wherein 0.27≤N*H / D≤0.32, and the units of H and D are both millimeters.

[0009] In some embodiments, stator teeth are formed between two adjacent stator slots on the stator. Any weld point on the stator that is welded to the housing is designated as weld point A. In a cross-section perpendicular to the axis of the stator, the line connecting weld point A and the center O of the stator is L1. The stator tooth on the stator closest to weld point A is designated as the first stator tooth. The angle between L1 and the bisector L3 of the first stator tooth is α. The line connecting the root of the first stator tooth along the circumferential direction of the stator to the center O of the stator is L2. The angle between L2 and the bisector L3 of the first stator tooth is β, where β < α ≤ 180°.

[0010] In some embodiments, the stator slot on the side of the first stator tooth along the circumferential direction of the stator is taken as the first stator slot; in a cross section perpendicular to the axis of the stator, the sidewall of the first stator tooth along the circumferential direction of the stator and the bottom surface of the first stator slot are connected by an arc, and the end of the arc facing away from the bottom surface of the first stator slot is the tooth root of the first stator tooth along the circumferential direction of the stator.

[0011] In some implementations, the motor is a permanent magnet motor.

[0012] This utility model also provides a compressor, which includes a housing, a pump body assembly and a motor as described above; a portion of the housing forms the housing, the pump body assembly is sleeved inside the housing and located on one axial side of the motor structure; the pump body assembly is welded to the housing, and the number of weld points on the pump body assembly that are welded to the housing is M2, where M1≤M2;

[0013] Specifically, the weld point on the stator that is welded to the housing is taken as the first weld point, and the weld point on the pump body assembly that is welded to the housing is taken as the second weld point; the axes of the pump body assembly and the motor structure coincide; on the projection along the axis of the pump body assembly, the angle between the line connecting any first weld point and the nearest adjacent second weld point to the center of the pump body assembly is c, where 0°≤c≤10°.

[0014] This utility model also provides an air conditioner, which includes the motor described in any one of the above-mentioned methods; or includes the compressor described in the above-mentioned methods.

[0015] The motor, compressor, and air conditioner provided by this utility model have the following beneficial effects:

[0016] 1. By setting M1≠n*N (n is a positive integer), such as setting 3 or 4 welding points for a 15-slot 10-pole motor, the stator mode vibration can be prevented from resonating with the housing through the welding points, thereby avoiding abnormal noise of the motor. When the motor is used in a compressor, it can reduce the occurrence of abnormal noise of the compressor.

[0017] 2. For a 15-slot, 10-pole motor, when 0.27 ≤ N*H / D ≤ 0.32, its overall efficiency and vibration noise level are optimal.

[0018] 3. By ensuring that b < a ≤ 180 / S degrees, the positions of the welding points on the stator can be avoided from the stator teeth, reducing the vibration transmission caused by radial electromagnetic force and further reducing the vibration noise of the motor. Attached Figure Description

[0019] To more clearly illustrate the embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. The drawings in the following description are merely exemplary, and those skilled in the art can derive other embodiments based on the provided drawings without creative effort.

[0020] Figure 1 This is a partial structural diagram of a motor provided in one embodiment of the present invention;

[0021] Figure 2 yes Figure 1 A partial schematic diagram of the motor;

[0022] Figure 3 yes Figure 1 A partial schematic diagram of the motor;

[0023] Figure 4 This is a schematic diagram showing the welding points of the motor and the pump body;

[0024] Figure 5 It is a schematic diagram reflecting the angle between the first solder joint and the second solder joint;

[0025] Figure 6 This is a graph showing the relationship between N*H / D of a 15-slot, 10-pole motor and its efficiency and noise.

[0026] Figure 7 This is a graph showing the relationship between N*H / D of a 12-slot 8-pole motor and its efficiency and noise.

[0027] The attached figures are labeled as follows:

[0028] 1. Housing; 2. Stator; 3. Stator tooth; 11. First weld point; 12. Second weld point; 21. Stator slot; 21a. First stator slot; 22. Weld point on the stator to the housing; 22a. Weld point A; 23. Weld point on the pump body assembly to the housing; 3a. First stator tooth; 3b. Tooth root of the first stator tooth on one side along the circumferential direction of the stator; 30. Sidewall of the first stator tooth on one side along the circumferential direction of the stator; 210. Bottom surface of the stator slot; 211. Bottom surface of the first stator slot; 212. Arc. Detailed Implementation

[0029] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present utility model or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0030] In the description of this utility model, it should be understood that the directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" 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 utility model and simplifying the description. Unless otherwise stated, these directional terms 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, and therefore should not be construed as a limitation on the scope of protection of this utility model. The directional terms "inner" and "outer" refer to the inner and outer contours of each component itself.

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

[0032] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be construed as limiting the scope of protection of this utility model.

[0033] See also Figure 1-3As shown, according to an embodiment of the present invention, an electric motor is provided, comprising a housing 1 and a motor structure. The motor structure includes a stator 2 and a rotor, the rotor being rotatably fitted inside the stator 2, the rotor having P magnetic poles, P≥10. The stator 2 is fitted inside the housing 1 and is welded to the housing 1. The number of weld points 22 on the stator and the housing is M1, and the stator 2 has S stator slots 21 along the circumferential direction, S being a positive integer greater than or equal to 2. The greatest common divisor of S and P is N, N>4, and M1≠n*N, where n is a positive integer.

[0034] In the above example, since the greatest common divisor of S and P is N, according to the electromagnetic force characteristics of the motor, the minimum order of the electromagnetic force wave generated by the motor is N, which will cause stator 2N-order and multiples thereof mode vibration modes. This invention, by setting M1≠n*N (n is a positive integer), such as setting 3 or 4 solder points for a 15-slot 10-pole motor, 3 or 5 solder points for a 12-slot 8-pole motor, and 4 or 5 solder points for a 9-slot 6-pole motor, can avoid the stator 2 mode vibration modes resonating with the housing 1 through the solder points, thereby preventing abnormal motor noise. When the motor is used in a compressor, it can reduce abnormal compressor noise.

[0035] In some implementations, the aforementioned motor may be a permanent magnet motor.

[0036] In some implementations, 6 ≥ M1 ≥ 3, which can ensure the reliability of the connection between the stator 2 and the housing 1, while reducing the impact of welding on motor performance.

[0037] In some implementations, S ≥ 15. In a specific application example, S = 15 and P = 10, meaning the aforementioned motor is a 15-slot, 10-pole motor.

[0038] In some implementations, such as Figure 2 As shown, for a 15-slot 10-pole motor, the maximum outer diameter of the stator 2 is D, and the minimum radial distance between each weld point 22 on the stator 2 that is welded to the housing 1 and the bottom surface 210 of the stator slot 21 is H, where 0.27≤N*H / D≤0.32, and the units of H and D are both millimeters.

[0039] The value of N varies depending on the slot-pole structure. According to the vibration response principle, the higher the order of the electromagnetic force wave, the smaller the vibration response caused by the same force wave amplitude. Therefore, the vibration response of a 15-slot, 10-pole motor is better than that of a 12-slot, 8-pole motor, which is better than that of a 9-slot, 6-pole motor. To ensure lower vibration and noise levels for the compressor and motor, N > 4 can be set. Furthermore, the minimum radial distance H from the weld point 22 on the stator 2, where it is welded to the housing 1, to the bottom surface of the stator slot 21 simultaneously affects both the structural stiffness and the area of ​​the stator slot 21, thus influencing vibration, noise, and efficiency. Within a certain range, a larger H means stronger stator 2 stiffness and lower vibration and noise, but also a smaller stator slot 21 area, resulting in higher copper losses and lower efficiency. Research has found that by rationally designing the relationship between N, D, and H, motor efficiency can be improved and vibration and noise reduced. Figure 6 The relationship between N*H / D and motor efficiency and noise for a 15-slot, 10-pole motor. Figure 7 This describes the relationship between N*H / D and the motor efficiency and noise of a 12-slot, 8-pole motor. Figure 6 As shown, for a 15-slot, 10-pole motor, the combined efficiency and vibration / noise level are optimal when 0.27 ≤ N*H / D ≤ 0.32.

[0040] In some implementations, such as Figure 2-3 As shown, stator teeth 3 are formed between two adjacent stator slots 21 on the stator 2. Any weld point on the stator 2 that is welded to the housing 1 is designated as weld point A 22a. In a cross section perpendicular to the axis of the stator 2, the line connecting weld point A 22a and the center O of the stator is L1. The stator tooth on the stator 2 closest to weld point A 22a is the first stator tooth 3a. The angle between L1 and the bisector L3 of the first stator tooth 3a is α. The line connecting the root 3b of the first stator tooth 3a on one side along the circumferential direction of the stator 2 and the center O of the stator is L2. The angle between L2 and the bisector L3 of the first stator tooth 3a is β, where β < α ≤ 180°.

[0041] In the example above, by making b < a ≤ 180 / S degrees, the positions of each solder point 22 on the stator 2 can be avoided from the stator teeth, reducing the vibration transmission caused by radial electromagnetic force and further reducing the vibration noise of the motor.

[0042] To facilitate understanding of the position of the tooth root 3b on one side of the first stator tooth 3a along the circumferential direction of the stator 2, in some embodiments, such as Figure 3 As shown, the stator slot on the side of the first stator tooth 3a along the circumferential direction of the stator 2 is designated as the first stator slot 21a. In a cross-section perpendicular to the axis of the stator 2, the sidewall 30 of the first stator tooth 3a along the circumferential direction of the stator 2 transitions to the bottom surface 211 of the first stator slot via an arc 212. The end of the arc 212 facing away from the bottom surface 211 of the first stator slot serves as the tooth root 3b of the first stator tooth 3a along the circumferential direction of the stator 2.

[0043] In some embodiments, the present invention also provides a compressor, which may include a housing, a pump assembly, and a motor of any of the above. A portion of the housing forms the aforementioned housing 1, and the pump assembly is fitted inside the housing and located on one axial side of the aforementioned motor structure; for example, the pump assembly may be located below the motor structure. Wherein, as... Figure 4 As shown, the pump body assembly is welded to the housing. The number of weld points 23 on the pump body assembly that are welded to the housing is M2, where M1 ≤ M2. The weld point on the stator 2 that is welded to the housing 1 is taken as the first weld point 11, and the weld point on the pump body assembly that is welded to the housing is taken as the second weld point 12. The axes of the pump body assembly and the motor structure coincide. Figure 5 As shown, on the projection along the axial direction of the pump body assembly, the angle between the line connecting any first solder point 11 and the nearest adjacent second solder point 12 and the center of the pump body assembly is c, where 0°≤c≤10°.

[0044] The aforementioned design ensures minimal motor vibration. However, due to the periodic suction and exhaust processes within the pump assembly during compressor operation, the vibration at the pump assembly position is typically significant. In the example above, this invention sets M1≤M2 and ensures that the circumferential position of the welding point between the motor and housing 1 is roughly equivalent to the circumferential position of the welding point between the pump assembly and housing 1 (within ±10° deviation), even if 0°≤c≤10°. This achieves a higher connection stiffness between the pump assembly and the housing than between the motor structure and the housing, allowing the vibration energy of the pump assembly to be transferred to the motor position. This balances the vibration distribution of the compressor, thereby reducing the overall vibration noise of the compressor.

[0045] In a specific application example, the aforementioned pump body assembly can be located below the motor structure.

[0046] This invention addresses the vibration and noise issues arising from the miniaturization of variable frequency compressors. Traditional methods to reduce noise by increasing the stator stiffness of the motor result in a smaller stator slot area 21 and decreased motor performance. This invention proposes improving efficiency and reducing noise through a rational design of the motor slot poles and stator dimensions, and by refining the fixing structure between the stator 2 and the housing 1.

[0047] In some embodiments, the present invention also provides an air conditioner that may include the motor described above; or include the compressor described above. Because the air conditioner uses the aforementioned motor or compressor, it can solve the problems of reduced performance and high vibration and noise caused by the miniaturization of the air conditioner compressor, improve motor energy efficiency, and reduce motor and compressor noise.

[0048] It will be readily understood by those skilled in the art that, without conflict, the advantageous technical features of the above-mentioned methods can be freely combined and superimposed.

[0049] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model. The above description is only a preferred embodiment of this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of this utility model, and these improvements and modifications should also be considered within the protection scope of this utility model.

Claims

1. An electric machine characterized by: The device includes a housing (1) and a motor structure. The motor structure includes a stator (2) and a rotor. The rotor is rotatably fitted inside the stator (2). The number of magnetic poles of the rotor is P, where P ≥ 10. The stator (2) is fitted inside the housing (1) and welded to the housing (1). The number of weld points (22) on the stator that are welded to the housing is M1. The stator (2) has S stator slots (21) along the circumferential direction, where S is a positive integer greater than or equal to 2. The greatest common divisor of S and P is N, where N > 4, and M1 ≠ n * N, where n is a positive integer.

2. The motor according to claim 1, characterized in that: 6≥M1≥3。 3. The motor according to claim 1 or 2, characterized in that: S = 15 and P = 10.

4. The motor according to claim 3, characterized in that: The maximum outer diameter of the stator (2) is D, and the minimum radial distance between each weld point (22) on the stator that is welded to the housing and the bottom surface (210) of the stator slot is H, where 0.27≤N*H / D≤0.32, and the units of H and D are both millimeters.

5. The motor according to claim 1, 2, or 4, characterized in that: Stator teeth (3) are formed between two adjacent stator slots (21) on the stator (2). Any weld point on the stator (2) that is welded to the housing (1) is called weld point A (22a). In a cross section perpendicular to the axis of the stator (2), the line connecting weld point A (22a) and the center O of the stator is L1. The stator tooth on the stator (2) closest to weld point A (22a) is the first stator tooth (3a). The angle between L1 and the midpoint line L3 of the first stator tooth (3a) is a. The line connecting the root (3b) of the first stator tooth (3a) on one side of the stator (2) along the circumferential direction and the center O of the stator is L2. The angle between L2 and the midpoint line L3 of the first stator tooth (3a) is b. b < a ≤ 180 / S degrees.

6. The motor according to claim 5, characterized in that: The first stator tooth (3a) is located in the stator slot (21a) on one side of the stator (2) along the circumferential direction. In a cross section perpendicular to the axis of the stator (2), the side wall (30) of the first stator tooth (3a) along the circumferential direction of the stator (2) and the bottom surface (211) of the first stator slot are connected by an arc (212). The end of the arc (212) facing away from the bottom surface (211) of the first stator slot is the tooth root (3b) of the first stator tooth (3a) along the circumferential direction of the stator (2).

7. The electric machine of any of claims 1-2, 4, 6, characterized by: The motor is a permanent magnet motor.

8. A compressor characterized by: The device includes a housing, a pump body assembly, and a motor as described in any one of claims 1-7; a portion of the housing forms the housing (1), the pump body assembly is fitted inside the housing and located on one axial side of the motor structure; the pump body assembly is welded to the housing, and the number of weld points (23) on the pump body assembly that are welded to the housing is M2, where M1≤M2; Among them, the welding point on the stator (2) that is welded to the housing (1) is taken as the first welding point (11), and the welding point on the pump body assembly that is welded to the housing is taken as the second welding point (12); the axes of the pump body assembly and the motor structure coincide; on the projection along the axis of the pump body assembly, the angle between the line connecting any first welding point (11) and the nearest adjacent second welding point (12) and the center of the pump body assembly is c, 0°≤c≤10°.

9. An air conditioner characterized by comprising: It includes the motor described in any one of claims 1-7; or it includes the compressor described in claim 8.

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