Motor, rotary compressor and refrigeration equipment

Abstract

The utility model discloses a motor, a rotary compressor and refrigeration equipment, the motor comprises a stator, the stator comprises a plurality of stator punching sheets, the stator punching sheets are provided with first connecting buckles, and the stator punching sheets are connected with adjacent stator punching sheets through the first connecting buckles; the rotor is arranged on the radial inner side of the stator, and the stator is suitable for driving the rotor to rotate; the motor meets the formula # imgabs0 #, L is the minimum radial distance between the first connecting buckle and the circle center of the stator, R is the radius of the maximum outer circle contour of the stator, and the number of poles of the rotor is 2P. According to the motor provided by the utility model, the minimum radial distance L between the first connecting buckle and the circle center of the stator, the number of poles 2P of the rotor and the radius R of the maximum excircle profile of the stator punching sheet are all in reasonable value ranges, so that the efficiency of the motor is effectively improved while the structural strength of the stator core, the stability of the rotor and the power of the motor are ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of compressors, in particular to an electric motor, a rotary compressor and a refrigeration device. Background Art

[0002] At present, the research on improving the energy efficiency of compressors has gradually become one of the important directions for the development of compressor technology.

[0003] In the related art, a compressor includes an electric motor and a compression component. The electric motor is connected to the compression component to drive the compression component to compress gas. As the power source of the compressor, the electric motor has an important influence on the energy efficiency of the compressor.

[0004] In the related art, the iron loss of the electric motor is relatively high, and the efficiency of the electric motor is relatively low, which is not conducive to the energy efficiency of the compressor. Content of the Utility Model

[0005] The utility model aims to solve at least one of the technical problems existing in the prior art. For this purpose, the utility model provides an electric motor, in which the minimum radial distance L between the first connecting buckle and the center of the stator, the number of poles 2P of the rotor, and the radius R of the maximum outer contour of the stator punching are all within reasonable value ranges. While ensuring the structural strength of the stator core, the stability of the rotor, and the power of the electric motor, the efficiency of the electric motor is effectively improved.

[0006] The utility model also provides a rotary compressor including the above electric motor.

[0007] The utility model also provides a refrigeration device including the above rotary compressor.

[0008] The electric motor according to an embodiment of the utility model includes: a stator, the stator includes a plurality of stator punchings, the stator punchings are provided with first connecting buckles, and the stator punchings are connected to adjacent stator punchings through the first connecting buckles; a rotor, the rotor is arranged radially inside the stator, and the stator is adapted to drive the rotor to rotate; the electric motor satisfies: Wherein, L is the minimum radial distance between the first connecting buckle and the center of the stator, R is the radius of the maximum outer contour of the stator, and the number of poles of the rotor is 2P.

[0009] For the electric motor according to an embodiment of the utility model, the minimum radial distance L between the first connecting buckle and the center of the stator, the number of poles 2P of the rotor, and the radius R of the maximum outer contour of the stator punching are all within reasonable value ranges. While ensuring the structural strength of the stator core, the stability of the rotor, and the power of the electric motor, the efficiency of the electric motor is effectively improved.

[0010] In some embodiments, the R satisfies: 40 mm ≤ R ≤ 95 mm.

[0011] In some embodiments, the motor satisfies: Wherein, N is the number of the first connection buckles on each stator lamination, the stator is provided with stator slots, and Q is the number of the stator slots.

[0012] In some embodiments, the number Q of the stator slots satisfies: 15 ≤ Q ≤ 18, and the number of poles 2P of the stator slots satisfies: 10 ≤ 2P ≤ 12.

[0013] In some embodiments, the motor satisfies:

[0014] In some embodiments, the motor satisfies: Wherein, in the orthographic projection of the stator on the vertical plane of the stator axis, the area of the first connection buckle is S.

[0015] In some embodiments, the stator lamination includes a stator yoke and stator teeth, the stator teeth are located radially inside the stator yoke, and a part of the first connection buckle is located on the stator yoke and another part is located on the stator teeth.

[0016] In some embodiments, the first connection buckle extends along the radial direction of the stator.

[0017] A rotary compressor according to an embodiment of the present invention includes: the motor described in the above technical solution; a compression component, the compression component is provided with a compression chamber, the compression component further includes a crankshaft and a piston located in the compression chamber, and the rotor is adapted to drive the piston to rotate through the crankshaft.

[0018] A refrigeration device according to an embodiment of the present invention includes the rotary compressor described in the above technical solution.

[0019] The additional aspects and advantages of the present invention will be partly given in the following description, partly will become obvious from the following description, or will be understood through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The above and / or additional aspects and advantages of the present invention will become obvious and easy to understand from the description of the embodiments in conjunction with the following drawings, wherein:

[0021] Figure 1 is a schematic diagram of a motor according to an embodiment of the present invention Figure 1 ;

[0022] Figure 2 is a schematic diagram of a motor according to an embodiment of the present invention Figure 2 ;

[0023] Figure 3 is Schematic diagram of the curve change of motor efficiency;

[0024] Figure 4 is Schematic diagram of the curve change of motor efficiency;

[0025] Figure 5 is Schematic diagram of the curve change of motor efficiency;

[0026] Figure 6 It is a schematic diagram of a rotary compressor according to an embodiment of the present invention.

[0027] Reference numerals: 100, motor; 1, stator; 11, stator core; 111, stator punching; 1111, first connecting buckle; 112, stator slot; 113, stator yoke; 114, stator tooth; 2, rotor; 21, rotor core; 22, permanent magnet; 200, rotary compressor; 3, compression component; 31, crankshaft; 32, piston; 33, compression chamber. Detailed implementation manners

[0028] The embodiments of the present invention will be described in detail below. The examples of the embodiments are shown in the drawings, where the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the drawings are exemplary and are only used to explain the present invention and should not be construed as a limitation of the present invention.

[0029] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation of the present invention. In addition, the features defined as "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise specified, the meaning of "plurality" is two or more.

[0030] In the description of the present utility model, it should be noted that unless otherwise clearly specified and defined, the terms "installation", "connection", and "coupling" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0031] Reference is now made to Figures 1 - 6 to describe the electric machine 100 according to an embodiment of the present utility model.

[0032] Referring to Figure 1 、 Figure 2 and Figure 3 ,the electric machine 100 according to an embodiment of the present utility model includes a stator 1 and a rotor 2. The stator 1 can be sleeved on the outer periphery of the rotor 2. The rotor 2 includes a rotor core 21 and a permanent magnet 22. The permanent magnet 22 can be disposed within the rotor core 21 to generate a permanent magnetic field in the rotor 2. The stator 1 includes a stator core 11. The stator core 11 has a plurality of stator slots 112 for placing stator windings. After the stator windings are energized, the stator windings can generate a rotating magnetic field in the stator 1. The rotating magnetic field of the stator 1 can drive the permanent magnetic field of the rotor 2 to rotate, so as to drive the rotor 2 to rotate relative to the stator 1, ensuring the normal operation of the electric machine 100.

[0033] When the electric machine 100 operates, a magnetic flux change will occur in the stator core 11, thereby generating an induced current in the stator core 11. These induced currents will generate eddy current losses, causing the stator core 11 to heat up and affecting the energy efficiency of the electric machine 100. The eddy current loss is proportional to the square of the thickness of the conductor. That is to say, the greater the thickness of the conductor, the greater the eddy current loss. To reduce the eddy current loss of the stator core 11, the stator core 11 includes a plurality of stator laminations 111. The plurality of stator laminations 111 are stacked to form the stator core 11. The plurality of stator laminations 111 are insulated from each other, suppressing the eddy current within each stator lamination 111 and effectively reducing the eddy current loss of the stator core 11. That is to say, by preventing the eddy current from conducting between the plurality of stator laminations 111, the overall eddy current loss of the stator core 11 can be significantly reduced.

[0034] Specifically, each stator lamination 111 is provided with an insulating layer. The insulating layer can be insulating paint on the surface of the stator lamination 111 or an oxide formed on the surface of the stator lamination 111. The present utility model does not limit this.

[0035] In order to ensure that the stator core 11 will not be deformed due to the offset of the stator punching 111 during the winding process of the coil winding, a certain connection strength is required between adjacent stator cores 11. In the embodiment of the present invention, each stator punching 111 is provided with a first connection buckle 1111. A part of the stator punching 111 protrudes toward one side in the thickness direction of the stator punching 111 to form the first connection buckle 1111. The first connection buckle 1111 is provided with a hollow, that is to say, on one side in the thickness direction of the stator punching 111, the first connection buckle 1111 protrudes outward, and a hollow groove is formed on the other side of the stator punching 111.

[0036] The first connection buckle 1111 of the stator punching 111 is inserted into the groove of the first connection buckle 1111 of the adjacent stator punching 111, so as to realize the riveting of the stator punching 111. Each stator punching 111 is connected to the adjacent stator punching 111 through the first connection buckle 1111, so that a plurality of stator punchings 111 are stacked and riveted to form the stator core 11, effectively reducing the risk of the stator punching 111 being offset and ensuring the overall structural strength of the stator core 11. However, when the adjacent stator punchings 111 are riveted through the first connection buckle 1111, the insulating layer at the first connection buckle 1111 is broken, causing the eddy current in the stator punching 111 to conduct between layers, which will increase the eddy current loss of the stator core 11.

[0037] The factors affecting the eddy current loss are: the magnetic flux density at the position where the first connection buckle 1111 is located, the magnetic reversal frequency of the stator core 11, the thickness of the conductor, and the volume of the conductor.

[0038] In the motor 100, the larger the minimum radial distance L between the first connection buckle 1111 and the center of the stator 1, the smaller the magnetic flux density. Theoretically, when the first connection buckle 1111 is at the position farthest from the center of the stator 1, the magnetic flux density at the position where the first connection buckle 1111 is located is the smallest, which can effectively reduce the eddy current loss of the stator core 11. However, the position of the first connection buckle 1111 will affect the bonding force between the stator punchings 111. If the first connection buckle 1111 is at the position farthest from the center of the stator 1, the stability of the overall structure of the stator core 11 is poor, and the stator core 11 has the risk of deformation. Therefore, the minimum radial distance L between the first connection buckle 1111 and the center of the stator 1 needs to be set within a reasonable range.

[0039] The eddy current loss is proportional to the square of the magnetic reversal frequency f of the stator core 11, and the magnetic reversal frequency f of the stator core 11 is proportional to the number of poles 2P of the rotor 2. The larger the number of poles 2P of the rotor 2, the larger the magnetic reversal frequency f of the stator core 11. That is to say, the square of 2P is proportional to the eddy current loss. The larger the number of poles 2P of the rotor 2, the greater the eddy current loss. The number of poles 2P of the rotor 2 also affects the stability of the motor 100. The more the number of poles 2P of the rotor 2, the lower the rotational speed of the rotor 2, the greater the torque that can be provided, and the higher the smoothness of the rotation of the rotor 2. Therefore, the value of P needs to be set within a reasonable range.

[0040] It should be noted that the rotor 2 is provided with a plurality of permanent magnets 22. Each permanent magnet 22 has its own south pole and north pole, but each permanent magnet 22 has only one end face (south pole or north pole) facing the stator 1 and interacting with the stator 1. Therefore, the number of poles 2P of the rotor 2 is equal to the number of permanent magnets 22.

[0041] The eddy current loss is proportional to the volume of the stator punching 111. Therefore, the radius R of the maximum outer circular contour of the stator punching 111 also affects the eddy current loss. The smaller the radius R of the maximum outer circular contour of the stator punching 111, the smaller the volume of the stator punching 111, and the smaller the eddy current loss. However, if the radius R of the maximum outer circular contour of the stator punching 111 is too small, it is easy to cause the power of the motor 100 not to meet the requirements. Therefore, the radius R of the maximum outer circular contour of the stator punching 111 needs to be set within a reasonable range.

[0042] Above, in the embodiment of the present utility model, the motor 100 satisfies:

[0043] Figure 3 For the schematic diagram of the curve change of the motor efficiency, referring to Figure 3 it can be seen that when the value is within the range of 15.5 - 25, the motor efficiency is at a relatively high value, effectively improving the energy efficiency of the motor 100, which is beneficial to improving the efficiency of the rotary compressor 200.

[0044] In some specific embodiments, the value can be any one of the point values of 15.5, 16, 17, 20, 23, 25 or the range value between any two of them.

[0045] According to the motor 100 of the embodiment of the present utility model, the minimum radial distance L between the first connecting buckle 1111 and the center of the stator 1, the number of poles 2P of the rotor 2, and the radius R of the maximum outer circular contour of the stator punching 111 are all within a reasonable value range. While ensuring the structural strength of the stator core 11, the stability of the rotor 2, and the power of the motor 100, the efficiency of the motor 100 is effectively improved.

[0046] In some specific embodiments, R satisfies: 40 mm ≤ R ≤ 95 mm.

[0047] If R is less than 40 mm, it will affect the power of the motor 100. If R is greater than 95 mm, the overall volume of the stator core 11 will be relatively large, increasing the eddy current loss. At the same time, the stator core 11 occupies a relatively large space, which is not conducive to the miniaturization of the motor 100 and the miniaturization of the rotary compressor 200.

[0048] In the embodiments of the present utility model, 40 mm ≤ R ≤ 95 mm. While ensuring the power of the motor 100, it reduces the eddy current loss, improves the efficiency of the motor 100, and is also conducive to the miniaturization of the motor 100.

[0049] In some embodiments, the motor 100 further satisfies: wherein, N is the number of the first connection buckles 1111 on each stator punching 111, the stator 1 is provided with stator slots 112, and Q is the number of the stator slots 112.

[0050] In the design of the motor 100, the reasonable matching of the number of slots Q and the number of poles 2P is crucial, which determines the electromagnetic performance, mechanical strength, and overall reliability and efficiency of the motor 100. When the number of poles 2P of the rotor 2 changes, the number of stator slots Q of the stator 1 also needs to change accordingly to ensure the normal operation of the motor 100. Therefore, the number of stator slots Q needs to be set within a reasonable range.

[0051] In addition, the larger the number N of the first connection buckles 1111 on the stator punching 111, the stronger the bonding force between the stator punchings 111, and the smaller the risk of deformation of the stator core 11. However, the larger the number N of the first connection buckles 1111 on the stator punching 111, the larger the interlayer eddy current, which affects the energy efficiency of the motor 100. The number N of the first connection buckles 1111 on the stator punching 111 needs to be set within a reasonable range.

[0052] Figure 4 For the schematic diagram of the curve change of the motor efficiency, refer to Figure 4 It can be seen that when the value is within the range of 32 - 375, the motor efficiency is at a relatively high value, effectively improving the energy efficiency of the motor 100, and thus being conducive to improving the efficiency of the rotary compressor 200.

[0053] In some specific embodiments, the value can be any one of the point values of 32, 88, 137, 220, 256, 375 or the range value between any two of them.

[0054] The number of poles of the rotor 2 is 2P, the number of stator slots 112 is Q, LCM(Q, 2P) is the least common multiple of the number of stator slots Q and the number of poles 2P of the rotor 2, and LCM(Q, 2P) can represent the torque ripple of the motor 100. For example, when LCM(Q, 2P) = 30, when the rotor 2 rotates one week, the torque of the rotor 2 will fluctuate 30 times. The larger LCM(Q, 2P) is, the more fluctuations in the torque of the rotor 2 within one cycle, that is, the torque ripple moves towards high frequency, the larger the number of torque ripple times, the smaller the amplitude of the torque ripple corresponding to the LCM(Q, 2P)th harmonic, and the higher the stability of the rotor 2.

[0055] In some embodiments of the present utility model, the rotary compressor 200 satisfies: LCM(Q, 2P)≥30. Compared with the motors with 9 slots and 6 poles and the motors with 12 slots and 8 poles in the related art, the least common multiple of the motor with 9 slots and 6 poles is 18, and the least common multiple of the motor with 12 slots and 8 poles is 24. In the motor of the embodiment of the present utility model, the least common multiple LCM(Q, 2P)≥30, the amplitude of the torque fluctuation is smaller, the stability of the rotor 2 is higher, and the operating stability of the rotary compressor 200 is also better.

[0056] In some embodiments, the number of poles 2P of the rotor 2 satisfies: 10≤2P≤12; the number of slots Q of the stator 1 satisfies: 15≤Q≤18.

[0057] Through the above technical solutions, in the embodiments of the present utility model, the motor 100 can be a motor 100 with 15 slots and 10 poles or a motor 100 with 18 slots and 12 poles. By restricting the number of poles of the rotor 2 and the number of slots of the stator 1, it is avoided that the values of the number of poles of the rotor 2 and the number of slots of the stator 1 are too large, reducing the production difficulty of the motor 100 and reducing the cost of the motor 100.

[0058] In some embodiments, the motor 100 satisfies:

[0059] The number of slots per pole per phase of the motor 100 is the number of stator slots Q divided by the number of poles 2P of the rotor 2 and then divided by the number of phases of the motor 100. The motor 100 is a three-phase motor 100, and the motor 100 satisfies That is to say, the motor 100 in the embodiments of the present utility model is a fractional-slot motor 100, which is beneficial to saving energy, improving work efficiency, and reducing noise, and the fractional slot can adopt a concentrated winding, which is beneficial to improving the regularity of automatic winding, can improve the utilization rate of the space in the stator slot 112, and can make the variable loss and constant loss of the motor 100 at a relatively average level, thereby improving the work efficiency of the motor 100 and increasing the power density of the motor 100.

[0060] In some embodiments, the motor 100 satisfies:

[0061] Among them, in the orthographic projection of the stator 1 on the vertical plane of the stator axis, the area of the first connecting buckle 1111 is S. N×S represents the total area of multiple first connecting buckles 1111 in a single stator lamination 111, and (π×R 2 ) represents the area of the largest outer circle of the stator 1. The ratio of N×S to (π×R 2 ) also affects the efficiency of the motor 100.

[0062] Figure 5 For the schematic diagram of the curve change with the motor efficiency, referring to Figure 5 it can be seen that when the value is within the range of 0.031 - 0.2, the motor efficiency is at a relatively high value, effectively improving the energy efficiency of the motor 100, which is beneficial to improving the efficiency of the rotary compressor 200.

[0063] In some specific embodiments, the value can be any one of 0.031, 0.06, 0.11, 0.16, 0.2 or the range value between any two of them.

[0064] In some embodiments, the stator lamination 111 includes a stator yoke 113 and stator teeth 114. The stator teeth 114 are located radially inside the stator yoke 113. There are multiple stator teeth 114, and stator slots 112 are defined between adjacent stator teeth 114. A part of the first connecting buckle 1111 is located on the stator yoke 113 and another part is located on the stator teeth 114.

[0065] Through the above technical solutions, the bonding force between the stator yoke 113 of the stator lamination 111 and the stator yoke 113 of the adjacent stator lamination 111 is improved, and the bonding force between the stator teeth 114 of the stator lamination 111 and the stator teeth 114 of the adjacent stator lamination 111 is also improved, effectively improving the strength of the stator core 11 and reducing the risk of deformation of the stator core 11.

[0066] In some further embodiments, the first connecting buckle 1111 extends radially along the stator 1.

[0067] When the stator lamination 111 is riveted to the adjacent stator lamination 111, the force on the whole stator lamination 111 is more uniform, reducing the risk of deformation of the stator lamination 111.

[0068] Referring to Figure 1 and Figure 6, the rotary compressor 200 according to an embodiment of the present invention includes: a compression component 3 and the motor 100 in the above technical solution. The compression component 3 is provided with a compression chamber 33. The compression component 3 further includes a crankshaft 31 and a piston 32 located in the compression chamber 33. The rotor 2 is adapted to drive the piston 32 to rotate through the crankshaft 31, and the piston 32 rotates in the compression chamber 33 to compress the gas in the compression chamber 33.

[0069] For the rotary compressor 200 according to an embodiment of the present invention, the minimum radial distance L between the first connecting buckle 1111 and the center of the stator 1, the number of poles 2P of the rotor 2, and the radius R of the maximum outer circular contour of the stator punching 111 are all within reasonable value ranges. While ensuring the structural strength of the stator core 11, the stability of the rotor 2, and the power of the motor 100, the efficiency of the motor 100 is effectively improved, thereby improving the energy efficiency of the rotary compressor 200.

[0070] The refrigeration device according to an embodiment of the present invention includes: the rotary compressor 200 in the above technical solution.

[0071] For the refrigeration device according to an embodiment of the present invention, the minimum radial distance L between the first connecting buckle 1111 and the center of the stator 1, the number of poles 2P of the rotor 2, and the radius R of the maximum outer circular contour of the stator punching 111 are all within reasonable value ranges. While ensuring the structural strength of the stator core 11, the stability of the rotor 2, and the power of the motor 100, the efficiency of the motor 100 is effectively improved, the energy efficiency of the rotary compressor 200 is improved, and the refrigerating capacity of the refrigeration device is improved.

[0072] In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0073] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirits of the present invention. The scope of the present invention is defined by the claims and their equivalents.

Claims

1. A motor, characterized in that, Comprising: A stator, the stator comprising a plurality of stator laminations, the stator laminations being provided with first connection buckles, and the stator laminations being connected to adjacent stator laminations through the first connection buckles; A rotor, the rotor being disposed radially inside the stator, and the stator being adapted to drive the rotor to rotate; The motor satisfies: Wherein, L is the minimum radial distance between the first connection buckle and the center of the stator, R is the radius of the maximum outer circular contour of the stator, and the number of poles of the rotor is 2P.

2. The motor according to claim 1, wherein The R satisfies: 40 mm ≤ R ≤ 95 mm.

3. The motor according to claim 1, characterized in that, The motor satisfies the following: where N is the number of the first connection buckles on each stator punching sheet, the stator is provided with stator slots, and Q is the number of the stator slots.

4. The motor according to claim 3, characterized in that, The number Q of the stator slots satisfies: 15 ≤ Q ≤ 18, and the number of poles 2P of the rotor satisfies: 10 ≤ 2P ≤ 12.

5. The motor according to claim 4, characterized in that, The motor satisfies:

6. The motor according to claim 1, characterized in that, The motor satisfies: Wherein, in the orthographic projection of the stator on a plane perpendicular to the axis of the stator, the area of the first connection buckle is S.

7. The motor according to any one of claims 1-6, characterized in that, The stator lamination includes a stator yoke and stator teeth, the stator teeth being located radially inside the stator yoke, and a part of the first connection buckle is located on the stator yoke and another part is located on the stator teeth.

8. The motor according to claim 7, characterized in that, The first connection buckle extends radially along the stator.

9. A rotary compressor, characterized in that, Comprising: The motor according to any one of claims 1-8; A compression component, the compression component being provided with a compression chamber, the compression component further including a crankshaft and a piston located in the compression chamber, and the rotor being adapted to drive the piston to rotate through the crankshaft.

10. A refrigeration device, characterized in that, Comprising: The rotary compressor according to claim 9.

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