Punching sheet, motor, compressor and air conditioner

Abstract

The utility model discloses a punching sheet, a motor, a compressor and an air conditioner, the punching sheet comprises a rotor punching sheet, the rotor punching sheet is provided with a magnet groove, the cross section area of the magnet groove is S1, the outer diameter of the rotor punching sheet is D1, the pole number of a rotor is P, and S1 < = 7pi * D12 / 20 * P. According to the punching sheet provided by the utility model, the magnet grooves are arranged in the rotor punching sheet, when the cross sectional area S1 of the magnet grooves, the outer diameter D1 of the rotor punching sheet and the number P of poles of the rotor meet the following relational expression: S1 < = 7pi * D12 / 20 * P, the total cross sectional area of the magnet grooves is small, so that under the condition that the maximum output torque of the rotor is not reduced, the use amount of magnets is reduced, and the cost is reduced. And the production and manufacturing cost is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of compressors, in particular to a punching sheet, a motor, a compressor and an air conditioner. Background Art

[0002] In the related technology, the rapid development and wide application of refrigeration equipment have promoted the rapid improvement of compressor technology. At present, the motors of commonly used compressors generally use built-in permanent magnet motors. The permanent magnet motors are equipped with rotors and stators. The rotors are stacked with multiple rotor punchings. Each rotor punching is provided with multiple magnet slots for accommodating magnets. In the prior art, in order to ensure that the rotor has a higher moment of inertia, the magnet slots are usually designed to be larger to accommodate more magnets, but this will cause the outer diameter of the rotor to be reduced, reducing the stability and reliability of the permanent magnet motor during operation, and the manufacturing cost of the rotor punching will increase, which is not cost-effective. Utility Model Content

[0003] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, one purpose of the utility model is to provide a punching sheet. According to the punching sheet of the utility model, a magnet slot is set in the rotor punching sheet, and the cross-sectional area S1 of the magnet slot satisfies the following relationship with the outer diameter D1 of the rotor punching sheet and the number of rotor poles P: S1≤7π*D1 2 When / 20*P, the total cross-sectional area of ​​the magnet slots is smaller, and the amount of magnets used is reduced without reducing the maximum output torque of the rotor, thereby reducing the production cost.

[0004] The utility model also provides a motor with the punching sheet.

[0005] The utility model also provides a compressor having the motor.

[0006] The utility model also provides an air conditioner with the compressor.

[0007] The punching sheet according to the utility model comprises: a rotor punching sheet, the rotor punching sheet is provided with a magnet slot, the cross-sectional area of ​​the magnet slot is S1, the outer diameter of the rotor punching sheet is D1 and the number of poles of the rotor is P, and satisfies: S1≤7π*D1 2 / 20*P.

[0008] According to the utility model, a rotor punching is provided in the punching sheet, and a magnet slot is provided in the rotor punching sheet, wherein the cross-sectional area of ​​the magnet slot S1, the outer diameter of the rotor punching sheet D1, and the number of rotor poles P satisfy the following relationship: S1≤7π*D1 2 / 20*P, under the condition of ensuring that the maximum output torque of the rotor is not reduced, the cross-sectional area of ​​the magnet slot accounts for a smaller proportion of the total area of ​​the rotor punching, reducing the amount of magnets used, reducing the manufacturing cost of the rotor punching, and improving economic benefits. At the same time, the outer diameter of the rotor punching is larger, the moment of inertia of the rotor is increased, and the stability and reliability of the rotor during low-frequency operation are improved. According to some embodiments of the utility model, the shortest distance between the center of the rotor punching and the magnet slot is L1, and satisfies: 2*L1 / D1≥0.22.

[0009] According to some embodiments of the present invention, the punching sheet further includes: a stator punching sheet, wherein the stator punching sheet is arranged on the outer periphery of the rotor punching sheet.

[0010] According to some embodiments of the present invention, a plurality of stator slots are formed on the stator punching sheet, the number of the stator slots is Q, and Q=15 is satisfied, and the number of poles P of the rotor satisfies: P=10.

[0011] The motor according to the utility model is briefly described below.

[0012] According to the utility model, the motor is provided with a rotor and a stator formed by stacking the punching sheets described in any one of the above embodiments. Since the motor is provided with a rotor and a stator formed by stacking the punching sheets described in any one of the above embodiments, the motor according to the present application has fewer magnets arranged in its rotor while maintaining normal use functions, thereby reducing the manufacturing cost of the motor without reducing the maximum output power of the motor.

[0013] According to some embodiments of the present invention, Q stator slots are formed on the stator, the number of phases of the motor is m and satisfies: Q / mP<1.

[0014] According to some embodiments of the present invention, the magnet slot is constructed as a straight slot extending in a direction perpendicular to the radius of the rotor punching sheet, and a plurality of the magnet slots are spaced apart in the circumferential direction of the rotor punching sheet.

[0015] According to some embodiments of the present invention, each of the magnet slots includes a first split slot and a second split slot, and the first split slot and the second split slot extend radially outwardly and obliquely in a direction away from each other.

[0016] The compressor according to the present utility model is briefly described below.

[0017] The compressor according to the utility model is provided with a motor according to any one of the above embodiments. Since the compressor according to the utility model is provided with a motor according to any one of the above embodiments, the compressor according to the utility model reduces the manufacturing cost of the compressor while ensuring normal working and use functions.

[0018] The air conditioner according to the utility model is briefly described below.

[0019] The air conditioner according to the utility model is provided with a compressor according to any one of the above-mentioned embodiments. Since the air conditioner according to the utility model is provided with a compressor according to any one of the above-mentioned embodiments, the air conditioner according to the utility model can reduce the manufacturing cost of the air conditioner while ensuring normal working functions, improve the economic benefits of the air conditioner, and enhance the stability and reliability of the air conditioner during operation.

[0020] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0022] Figure 1 It is a schematic diagram of the structure of a stator punching sheet according to an embodiment of the utility model;

[0023] Figure 2 It is a schematic diagram of the structure of a stator punching sheet according to another embodiment of the utility model;

[0024] Figure 3 is a schematic diagram of the cross-sectional shape of a magnet slot according to an embodiment of the utility model;

[0025] Figure 4 is a schematic diagram of the cross-sectional shape of a magnet slot according to another embodiment of the utility model;

[0026] Figure 5 This is a schematic diagram of the relationship between the rotor outer diameter and the maximum output torque according to an embodiment of the utility model;

[0027] Figure 6 It is a schematic diagram of the relationship between the outer diameter of the rotor punching and the total area of ​​the rotor magnet slot according to one embodiment of the utility model;

[0028] Figure 7 It is a schematic diagram showing the number of rotor poles and electromagnetic force density according to an embodiment of the utility model.

[0029] Reference numerals:

[0030] 100. Punch film;

[0031] 11. rotor punching sheet; 101. magnet slot; 102. first split slot; 103. second split slot;

[0032] 12. stator; 120. stator slot. DETAILED DESCRIPTION

[0033] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0034] In the related technology, the rapid development and wide application of refrigeration equipment have promoted the rapid improvement of compressor technology. At present, the motors of commonly used compressors generally use built-in permanent magnet motors. The permanent magnet motors are equipped with rotors and stators. The rotors are stacked with multiple rotor punchings. Each rotor punching is provided with multiple magnet slots for accommodating magnets. In the prior art, in order to ensure that the rotor has a higher moment of inertia, the magnet slots are usually designed to be larger to accommodate more magnets, but this will cause the outer diameter of the rotor to be reduced, reducing the stability and reliability of the permanent magnet motor during operation, and the manufacturing cost of the rotor punching will increase, which is not cost-effective.

[0035] Reference below Figure 1-Figure 7 A punching sheet according to an embodiment of the present invention is described.

[0036] The punching sheet 100 according to the utility model comprises: a rotor punching sheet 11, the rotor punching sheet 11 is provided with a magnet slot 101, the cross-sectional area of ​​the magnet slot 101 is S1, the outer diameter of the rotor punching sheet 11 is D1 and the number of poles of the rotor is P, and satisfies: S1≤7π*D1 2 / 20*P.

[0037] In some specific embodiments, a magnet slot 101 is provided on the rotor punching sheet 11. The magnet slot 101 is constructed as a special-shaped area hollowed out near the outer diameter side of the rotor. A magnet is provided in the magnet slot 101. The magnet can provide a stable and strong magnetic field to drive the rotor to rotate. Figure 5 , Figure 6 and Figure 7 As shown, in the present application, the cross-sectional area of ​​the magnet slot 101 is set to S1, the outer diameter of the rotor punching 11 is set to D1, and the number of poles of the rotor is set to P, wherein S1, D1 and P satisfy the following relationship: S1≤7π*D1 2 / 20*P, that is, S1≤7 / 5*π*D1 2 / 4*P, the cross-sectional area of ​​each lower pole rotor punching 11 is set to S2, S2 = π*D1 2 / 4*P, therefore S1≤7 / 5*S2, S1 / S2≤7 / 5.

[0038] When S1, D1 and P satisfy the above relationship, the cross-sectional area of ​​the magnet slot 101 accounts for a smaller proportion of the total area of ​​the rotor punching 11 while ensuring that the maximum output torque of the rotor is not reduced, thereby reducing the amount of magnets used, reducing the manufacturing cost of the rotor punching 11, and improving the economic benefits. At the same time, the outer diameter of the rotor punching 11 is larger, which increases the rotor's moment of inertia and improves the stability and reliability of the rotor during low-frequency operation.

[0039] According to the utility model, a rotor punching sheet 11 is provided in the punching sheet, and a magnet slot 101 is provided in the rotor punching sheet 11, wherein the cross-sectional area of ​​the magnet slot 101 is S1, the outer diameter of the rotor punching sheet 11 is D1, and the number of rotor poles P satisfies the following relationship: S1≤7π*D1 2 / 20*P, so that the cross-sectional area of ​​the magnet slot 101 accounts for a smaller proportion of the total area of ​​the rotor punching 11 without reducing the maximum output torque of the rotor, thereby reducing the amount of magnets used, reducing the manufacturing cost of the rotor punching 11, and improving the economic benefits. At the same time, the outer diameter of the rotor punching 11 is larger, which increases the moment of inertia of the rotor and improves the stability and reliability of the rotor during low-frequency operation.

[0040] According to some embodiments of the present invention, the shortest distance between the center of the rotor punching sheet 11 and the magnet slot 101 is L1, and satisfies: 2*L1 / D1≥0.22.

[0041] When L1 and D1 satisfy the above relationship, the cross-sectional area of ​​the magnet slot 101 can be made as small as possible to account for the total area of ​​the rotor punching 11 without reducing the maximum output torque of the rotor, thereby reducing the amount of magnets used, reducing the manufacturing cost of the rotor punching 11, and improving the economic benefits. At the same time, the outer diameter of the rotor punching 11 is made larger, which increases the rotor's moment of inertia and improves the stability and reliability of the rotor during low-frequency operation.

[0042] According to some embodiments of the utility model, the punching sheet further includes: a stator punching sheet, which is arranged at the periphery of the rotor punching sheet 11, and the stator punching sheet is responsible for providing the main magnetic field, and the rotor punching sheet 11 rotates in this magnetic field. The stator punching sheet is arranged at the periphery of the rotor punching sheet 11, so that it can be ensured that the magnetic field generated by the stator punching sheet can completely cover the rotor punching sheet 11, thereby achieving effective electromagnetic conversion, and at the same time, the stator punching sheet can also provide stable support and positioning for the rotor punching sheet 11, ensuring the stability and reliability of the motor during operation.

[0043] The stator 12 and the rotor are stamped together on a single material. The integrated stamping reduces the steps of manufacturing the stator and the rotor separately and then assembling them, shortening the production cycle. At the same time, since the steps and number of parts in the manufacturing and assembly process of the stator 12 and the rotor are reduced, the manufacturing cost of the stator and the rotor is reduced. In addition, because the stator and the rotor are stamped together, the relative position between them is very accurate, thereby improving the electromagnetic performance of the motor.

[0044] According to some embodiments of the present invention, the number of stator slots 120 formed on the stator punching sheet is Q, and Q=15, and the number of poles P of the rotor satisfies: P=10.

[0045] In some specific embodiments, the number of stator slots 120 mainly determines the layout of the stator winding and the distribution of the electromagnetic field, while the number of rotor poles determines the speed of change of the rotor magnetic field and the speed of the motor. Generally speaking, there is no fixed mathematical formula to determine the best match between the number of stator slots 120 and the number of rotor poles. However, in this application, an experimenter has obtained a quantitative relationship between the number of stator slots 120 and the number of rotor poles applicable to this application through experimental data analysis, that is, as shown in the table in the figure, the number of multiple stator slots 120 formed on the stator punching sheet is set to Q, and the number of rotor poles is set to P, where Q=15 and P=10. When Q is set to 15 and P is set to 10, the matching relationship between the number of stator slots 120 and the number of rotor poles is optimized, which further makes the distribution of electromagnetic force in time and space more uniform and high-order, significantly reduces the force density of the motor in a specific frequency band, thereby reducing the noise and vibration of the motor and improving the overall performance of the motor.

[0046] In other specific embodiments, the number of rotor poles P in the present application can also satisfy: P>10. By increasing the number of rotor poles P, the magnetic field distribution inside the motor becomes more uniform and detailed, thereby enhancing the electromagnetic conversion efficiency inside the motor, and improving the output power and torque density of the motor. At the same time, it can also reduce the generation of harmonic components to a certain extent, thereby reducing the energy loss during motor operation.

[0047]

[0048] The motor according to the utility model is briefly described below.

[0049] According to the utility model, the motor is provided with a rotor and a stator formed by stacking the punching sheets described in any one of the above embodiments. Since the motor is provided with a rotor and a stator formed by stacking the punching sheets described in any one of the above embodiments, the motor according to the present application has fewer magnets arranged in its rotor while maintaining normal use functions, thereby reducing the manufacturing cost of the motor without reducing the maximum output power of the motor.

[0050] According to some embodiments of the present invention, Q stator slots 120 are formed on the stator 12, the number of phases of the motor is m and satisfies: Q / mP<1.

[0051] In some specific embodiments, the number of stator slots 120 is Q, the number of phases of the motor is m, and the number of rotor stages is P, wherein Q, P and m satisfy the following relationship: Q / mP<1. This condition is to limit the number of slots per pole per phase, that is, the number of stator slots 120 occupied by each phase under each rotor pole number. According to the above relationship Q / mP<1, it can be seen that the number of stator slots 120 occupied by each phase under each rotor stage is less than 1, which can reduce the cogging torque of the motor, thereby reducing vibration and noise, improving the power density and efficiency of the motor, and at the same time reducing the manufacturing cost of the motor.

[0052] According to some embodiments of the present invention, the magnet slots 101 are configured as linear slots extending in a direction perpendicular to the radius of the rotor sheet 11 , and a plurality of magnet slots 101 are spaced apart in the circumferential direction of the rotor sheet 11 .

[0053] In some specific embodiments, the magnet slot 101 is constructed as a straight slot, which extends in a direction perpendicular to the radius of the rotor punching 11. Since the magnet slot 101 extends in a direction perpendicular to the radius, after the magnet is placed in the magnet slot 101, its force direction will be more uniform, reducing the risk of magnet displacement or falling off due to uneven force, improving the reliability of the motor, and reducing problems such as performance degradation or failure caused by changes in the position of the magnet; multiple magnet slots 101 are spaced apart in the circumferential direction of the rotor punching 11, so that the magnets can be evenly arranged along the circumference of the rotor punching 11, which on the one hand helps to achieve a uniform distribution of the magnetic field, and on the other hand can form a smoother and continuous magnetic field, which can not only improve the magnetic energy conversion efficiency of the motor, but also reduce the vibration and noise caused by the uneven magnetic field.

[0054] According to some embodiments of the present invention, each magnet slot 101 includes a first split slot 102 and a second split slot 103 , and the first split slot 102 and the second split slot 103 extend radially outwardly in a direction away from each other.

[0055] In some specific embodiments, each magnet slot 101 is composed of a first split slot 102 and a second split slot 103, one end of the first split slot 102 is connected to one end of the second split slot 103, and the other end of the first split slot 102 and the other end of the second split slot 103 extend radially outward in a direction away from each other. The openness and flexibility of this design enable the magnet slot 101 to accommodate magnets of different shapes and sizes to adapt to a variety of application scenarios, thereby improving the versatility and practicality of the rotor punching 11. The magnet slot 101 in the present application can achieve precise control of the magnetic field strength by adjusting the shape and size of the first split slot 102 and the second split slot 103 to meet the needs of specific applications.

[0056] The compressor according to the present utility model is briefly described below.

[0057] The compressor according to the utility model is provided with a motor according to any one of the above embodiments. Since the compressor according to the utility model is provided with a motor according to any one of the above embodiments, the compressor according to the utility model reduces the manufacturing cost of the compressor while ensuring normal working and use functions.

[0058] The air conditioner according to the utility model is briefly described below.

[0059] The air conditioner according to the utility model is provided with a compressor according to any one of the above-mentioned embodiments. Since the air conditioner according to the utility model is provided with a compressor according to any one of the above-mentioned embodiments, the air conditioner according to the utility model can reduce the manufacturing cost of the air conditioner while ensuring normal working functions, improve the economic benefits of the air conditioner, and enhance the stability and reliability of the air conditioner during operation.

[0060] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0061] In the description of the present invention, "first feature" or "second feature" may include one or more of the features.

[0062] In the description of the present invention, "plurality" means two or more.

[0063] In the description of the present invention, a first feature being “above” or “below” a second feature may include that the first and second features are directly in contact with each other, or may include that the first and second features are not in direct contact but are in contact with each other via another feature therebetween.

[0064] In the description of the present utility model, the first feature "above", "above" and "above" the second feature include the first feature being directly above and obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0065] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A punching sheet, characterized in that: include: A rotor punching, wherein the rotor punching is provided with a magnet slot, the cross-sectional area of ​​the magnet slot is S1, the outer diameter of the rotor punching is D1 and the number of poles of the rotor is P, and satisfies: S1≤7π*D1 2 / 20*P.

2. The punching sheet according to claim 1, characterized in that: The shortest distance between the center of the rotor punching sheet and the magnet slot is L1, and satisfies: 2*L1 / D1≥0.

22.

3. The punching sheet according to claim 1, characterized in that: Also includes: The stator punching sheet is arranged on the outer periphery of the rotor punching sheet.

4. The punching sheet according to claim 3, characterized in that: A plurality of stator slots are formed on the stator punching sheet. The number of the stator slots is Q, and Q=15. The number of poles P of the rotor satisfies: P=10.

5. A motor, characterized in that: include: A rotor and a stator, wherein the rotor is formed by stacking the punching sheets described in any one of claims 1 to 4.

6. The motor according to claim 5, characterized in that The stator is formed with Q stator slots, the number of phases of the motor is m and satisfies: Q / mP<1.

7. The motor according to claim 5, characterized in that The magnet slots are configured as linear slots extending in a direction perpendicular to the radius of the rotor sheet, and a plurality of the magnet slots are spaced apart in a circumferential direction of the rotor sheet.

8. The motor according to claim 5, characterized in that Each of the magnet slots includes a first split slot and a second split slot, wherein the first split slot and the second split slot extend radially outwardly and obliquely in a direction away from each other.

9. A compressor, characterized in that: A motor comprising any one of claims 5-8.

10. An air conditioner, characterized in that: A compressor comprising any one of claim 9.

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