Motor, compressor and refrigeration equipment

Abstract

The utility model discloses a motor, a compressor and refrigeration equipment. The motor comprises a stator; the rotor is arranged in an inner cavity of the stator, the rotor comprises a rotor iron core and magnets, the rotor iron core is provided with a plurality of magnet grooves, the magnet grooves are arranged at intervals in the circumferential direction of the rotor iron core, the magnets are suitable for being installed in the magnet grooves, the outer diameter of the rotor is D, and on the cross section perpendicular to the rotating axial direction of the rotor, D is larger than D; the minimum distance between each magnet and the rotation center of the rotor is L, the intrinsic coercive force of the magnets is Hcj, and the Hcj (L / D) / 1000 is larger than or equal to 0.975 kA / m and smaller than or equal to 1.71 kA / m, and the Hcj is smaller than or equal to 1800 kA / m. According to the motor provided by the embodiment of the utility model, the ratio of the minimum distance between each magnet and the rotation center of the rotor to the outer diameter of the rotor is defined as a demagnetization factor, and the relationship between the demagnetization factor and the intrinsic coercive force of the magnets is limited, so that the utilization rate of the magnets can be ensured, and the service life of the motor is prolonged on the basis of ensuring the demagnetization rate of the motor. The use of counterweight rare earth materials can be reduced, the cost of the magnet is reduced, and the cost performance of the motor is improved.

Description

Technical Field

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

[0002] Rare earth materials are strategic resources of the country at present. With the development of frequency conversion in the new energy and household appliance industries, the price of rare earths has gradually increased.

[0003] In related technologies, existing air-conditioning compressors generally use variable-frequency motors to drive. In order to ensure the working efficiency and demagnetization reliability of the motors, the rotors of variable-frequency motors need to use rare earth materials, which are costly and increase the dependence on rare earth materials, leaving room for improvement. Summary of the Utility Model

[0004] The utility model aims to at least solve one of the technical problems existing in the prior art. For this reason, an object of the utility model is to provide a motor, which can reduce the use of heavy rare earth materials, and has high working efficiency and demagnetization reliability.

[0005] The utility model also provides a compressor.

[0006] The utility model also provides a refrigeration device.

[0007] The motor according to the first aspect embodiment of the utility model includes: a stator; a rotor, the rotor is arranged in the inner cavity of the stator, the rotor includes a rotor core and magnets, the rotor core has a plurality of magnet slots, and the plurality of magnet slots are arranged at intervals along the circumferential direction of the rotor core, and the magnets are adapted to be installed in the magnet slots. Wherein, the outer diameter of the rotor is D, and in a cross-section perpendicular to the rotation axis of the rotor, the minimum distance between each magnet and the rotation center of the rotor is L, and the intrinsic coercivity of the magnet is Hcj, satisfying: 0.975 kA / m ≤ Hcj(L / D) / 1000 ≤ 1.71 kA / m, Hcj ≤ 1800 kA / m.

[0008] According to the motor embodiment of the utility model, by defining the ratio of the minimum distance between each magnet and the rotation center of the rotor to the outer diameter of the rotor as the demagnetization factor, and by limiting the relationship between the demagnetization factor and the intrinsic coercivity of the magnet, the utilization rate of the magnet can be ensured, that is, the motor torque provided by the magnet per unit volume can be ensured, and on the basis of ensuring the demagnetization rate of the motor, the use of heavy rare earth materials can be reduced, the cost of the magnet can be reduced, and the cost performance of the motor can be improved.

[0009] According to some embodiments of the utility model, the outer diameter D of the rotor satisfies: 49 mm ≤ D ≤ 81 mm.

[0010] In some examples, the minimum distance between each of the magnets and the rotation center of the rotor is L, satisfying: 16 mm ≤ L ≤ 35 mm.

[0011] According to some embodiments of the present invention, the magnet contains heavy rare earth elements, and the mass percentage of the heavy rare earth elements in the magnet is M, 0.2% ≤ M ≤ 1.5%.

[0012] According to some embodiments of the present invention, the heavy rare earth elements include at least one of dysprosium and terbium.

[0013] According to some embodiments of the present invention, the remanence of the magnet at 20 °C is Br, satisfying: 1.28 T ≤ Br ≤ 1.5 T.

[0014] According to some embodiments of the present invention, the outer diameter of the stator is d1, and the inner diameter of the stator is d2, 0.49 ≤ d1 / d2 ≤ 0.64.

[0015] According to some embodiments of the present invention, the number of the magnets per pole of the rotor is 1.

[0016] According to some embodiments of the present invention, the number of the magnets per pole of the rotor is 2, and the two magnets in each pole of the magnets have an included angle.

[0017] In some examples, the stator has a plurality of stator slots, the number of the stator slots is Q, and the number of poles of the rotor is 2p, satisfying: 2p / Q = 2 / 3.

[0018] In some examples, the number of the stator slots is Q, and the number of poles of the rotor is 2p, satisfying: Q = 15, 2p = 10.

[0019] The compressor according to the embodiment of the second aspect of the present invention includes the motor according to the embodiment of the first aspect of the present invention. By adopting the above motor, on the basis of improving the working efficiency and demagnetization reliability of the compressor, the use of heavy rare earth materials can be reduced, the cost of the compressor can be lowered, and the cost performance of the compressor can be improved.

[0020] The refrigeration device according to the embodiment of the third aspect of the present invention includes the motor according to the embodiment of the first aspect of the present invention, or includes the compressor according to the embodiment of the second aspect of the present invention. By adopting the above motor or compressor, on the basis of improving the working efficiency and demagnetization reliability of the refrigeration device, the use of heavy rare earth materials can be reduced, the cost of the refrigeration device can be lowered, and the cost performance of the refrigeration device can be improved.

[0021] Additional aspects and advantages of the present utility model will be given in part in the following description, become apparent in part from the following description, or be learned through the practice of the present utility model. Description of the Drawings

[0022] The above-mentioned and / or additional aspects and advantages of the present utility model will become apparent and be readily understood from the description of the embodiments in conjunction with the following drawings, where:

[0023] Figure 1 is a schematic structural diagram of a motor according to some embodiments of the present utility model;

[0024] Figure 2 is a schematic dimension diagram of a motor according to some embodiments of the present utility model;

[0025] Figure 3 is a schematic structural diagram of a refrigeration device according to some embodiments of the present utility model;

[0026] Figure 4 is a comparison chart of the cost and efficiency of a motor according to some embodiments of the present utility model;

[0027] Figure 5 is a comparison chart of Hcj(L / D) / 1000 and the demagnetization rate of a motor according to some embodiments of the present utility model.

[0028] Reference Signs:

[0029] Motor 100, Compressor 1000, Refrigeration Device 10000,

[0030] Stator 10, Stator Slot 11,

[0031] Rotor 20, Rotor Core 21, Magnet Slot 211, First Slot Segment 2111, Second Slot Segment 2112, Magnet 22. Detailed Description of the Embodiments

[0032] Embodiments of the present utility model will be described in detail below. 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 by referring to the drawings are exemplary and are only used to explain the present utility model and should not be construed as a limitation of the present utility model.

[0033] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by 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. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model 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 therefore should not be construed as a limitation to the present utility model. 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 utility model, unless otherwise specified, the meaning of "a plurality" is two or more.

[0034] In the description of the present utility model, it should be noted that unless otherwise clearly specified and defined, the terms "mounted", "connected" and "coupled" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements. 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.

[0035] The following refers to Figures 1-5 Describe the motor 100 according to an embodiment of the present utility model.

[0036] As Figures 1-5 shown, the motor 100 according to an embodiment of the present utility model includes: a stator 10 and a rotor 20. The rotor 20 is disposed in the inner cavity of the stator 10. The rotor 20 includes a rotor core 21 and magnets 22. The rotor core 21 has a plurality of magnet slots 211. The plurality of magnet slots 211 are arranged at intervals along the circumferential direction of the rotor core 21. The magnets 22 are adapted to be mounted in the magnet slots 211 to generate a permanent magnetic field in the rotor 20. After the motor 100 is powered on, the stator 10 can generate a rotating magnetic field, so that the rotating magnetic field of the stator 10 can drive the permanent magnetic field of the rotor 20 to rotate, thereby driving the rotor 20 to rotate relative to the stator 10, and ensuring the normal operation of the motor 100.

[0037] Among them, the intrinsic coercivity of the magnet 22 is Hcj. When the motor 100 reduces the use of heavy rare earth materials, the intrinsic coercivity of the magnet 22 will be reduced. Thus, the intrinsic coercivity of the magnet 22 can be limited between 0 - 1800 kA / m. Hcj can be any one of the point values of 0 kA / m, 200 kA / m, 400 kA / m, 600 kA / m, 800 kA / m, 1000 kA / m, 1200 kA / m, 1400 kA / m, 1600 kA / m, 1800 kA / m or the range value between any two of them. Thereby, the use of heavy rare earth materials can be reduced, the cost of the magnet 22 can be lowered, and the cost performance of the motor 100 can be improved.

[0038] The outer diameter of the rotor 20 is D. On the cross-section perpendicular to the rotation axis of the rotor 20, the minimum distance between each magnet 22 and the rotation center of the rotor 20 is L. If the minimum distance between each magnet 22 and the rotation center of the rotor 20 is too large, the demagnetization rate of the motor 100 will increase, and the demagnetization reliability of the motor 100 will be reduced. If the minimum distance between each magnet 22 and the rotation center of the rotor 20 is too small, the magnetic flux of the rotor 20 will be reduced, the utilization rate of the magnet 22 will be reduced, and the working efficiency of the motor 100 will be reduced; and if the intrinsic coercivity of the magnet 22 is too small, the anti-magnetic performance of the magnet 22 will be weakened, the demagnetization rate of the magnet 22 will increase, and the demagnetization reliability of the motor 100 will be reduced.

[0039] Furthermore, the size of the motor 100 can be associated with the intrinsic coercivity of the magnet 22. For example, the intrinsic coercivity of the magnet 22 is multiplied by the ratio of the minimum distance between each magnet 22 and the rotation center of the rotor 20 to the outer diameter of the rotor 20, that is, Hcj(L / D). Among them, L / D can represent the demagnetization factor of the motor 100. If the demagnetization factor is too large, the demagnetization rate of the motor 100 will increase, and the demagnetization reliability of the motor 100 will be reduced.

[0040] Thus, Hcj(L / D) / 1000 can be limited between 0.975 kA / m and 1.71 kA / m. Hcj(L / D) / 1000 can be any one of the point values of 0.975 kA / m, 1.0 kA / m, 1.1 kA / m, 1.2 kA / m, 1.3 kA / m, 1.4 kA / m, 1.5 kA / m, 1.6 kA / m, 1.7 kA / m, 1.71 kA / m or the range value between any two of them. Designers can reduce the proportion of heavy rare earth elements in the motor 100 to determine the material of the motor 100. And by inputting the Hcj of this material into Hcj(L / D) / 1000, the range of the ratio between the minimum distance between the rotation centers of the rotors 20 and the outer diameter of the rotor 20 can be determined, which is beneficial for designers to determine a reasonable size for the motor 100 without heavy rare earth elements. Thus, on the basis of improving the working efficiency and demagnetization reliability of the motor 100, the use of heavy rare earth materials can be reduced, the cost of the motor 100 can be lowered, and the cost performance of the motor 100 can be improved.

[0041] For the motor 100 according to the embodiment of the present invention, by defining the ratio between the minimum distance between each magnet 22 and the rotation center of the rotor 20 and the outer diameter of the rotor 20 as the demagnetization factor, and by limiting the relationship between the demagnetization factor and the intrinsic coercivity of the magnet 22, the utilization rate of the magnet 22 can be guaranteed, that is, the torque of the motor 100 provided by the magnet 22 per unit volume can be guaranteed. And on the basis of ensuring the demagnetization rate of the motor 100, the use of heavy rare earth materials can be reduced, the cost of the magnet 22 can be lowered, and the cost performance of the motor 100 can be improved.

[0042] As Figure 2 shown, according to some embodiments of the present invention, the outer diameter of the rotor 20 is D, and the value range of the outer diameter of the rotor 20 is related to the value range of the inner diameter of the stator 10. On the basis of determining the value range of the inner diameter of the stator 10, if the outer diameter of the rotor 20 is too large, the amount of the magnet 22 of the rotor 20 will increase; if the outer diameter of the rotor 20 is too small, the amount of the copper wire of the stator winding will increase.

[0043] Thus, the outer diameter of the rotor 20 can be limited between 49 mm and 81 mm. D can be any one of the point values of 49 mm, 50 mm, 55 mm, 60 mm, 65 mm, 70 mm, 75 mm, 80 mm, 81 mm or the range value between any two of them. Designers can determine the outer diameter of the rotor 22 according to the current costs of the rare earth magnet 22 and the copper wire. On the basis of ensuring the normal operation of the motor 100, the cost of the motor can be reasonably controlled, which is beneficial to improving the cost performance of the motor 100.

[0044] As Figure 2As shown, in some examples, the minimum distance between each magnet 22 and the rotation center of the rotor 20 is L. Based on determining the value range of the outer diameter of the rotor 20, if the minimum distance between each magnet 22 and the rotation center of the rotor 20 is too large, the demagnetization rate of the motor 100 will increase, reducing the demagnetization reliability of the motor 100. If the minimum distance between each magnet 22 and the rotation center of the rotor 20 is too small, the magnetic flux of the rotor 20 will decrease, reducing the utilization rate of the magnet 22 and the working efficiency of the motor 100.

[0045] Therefore, the minimum distance between each magnet 22 and the rotation center of the rotor 20 can be limited to between 16 mm and 35 mm. L can be any one of the point values of 16 mm, 19 mm, 22 mm, 25 mm, 28 mm, 31 mm, 35 mm or the range value between any two of them, which can ensure the magnetic flux of the rotor 20, improve the utilization rate of the magnet 22, that is, improve the torque of the motor 100 provided by the magnet 22 per unit volume.

[0046] According to some embodiments of the present invention, the magnet 22 may contain heavy rare earth elements, and the mass percentage of the heavy rare earth elements in the magnet 22 is M. If the mass percentage of the heavy rare earth elements in the magnet 22 is too large, the cost of the magnet 22 will increase. If the mass percentage of the heavy rare earth elements in the magnet 22 is too small, the demagnetization rate of the magnet 22 is likely to increase, affecting the demagnetization reliability of the motor 100.

[0047] Therefore, the mass percentage of the heavy rare earth elements in the magnet 22 can be limited to between 0.2% and 1.5%. M can be any one of the point values of 0.2%, 0.6%, 0.9%, 1.2%, 1.5% or the range value between any two of them. Based on ensuring the demagnetization rate of the magnet 22 and the demagnetization reliability of the motor 100, it is beneficial to reduce the cost of the magnet 22 and improve the cost performance of the motor 100.

[0048] According to some embodiments of the present invention, the heavy rare earth elements include at least one of dysprosium and terbium. Among them, the heavy rare earth elements may include dysprosium, and the designer can limit the mass percentage of dysprosium in the magnet 22 to between 0.2% and 1.5%. The heavy rare earth elements may include terbium, and the designer can limit the mass percentage of terbium in the magnet 22 to between 0.2% and 1.5%. The heavy rare earth elements may include dysprosium and terbium, and the designer can limit the mass percentage of dysprosium and terbium in the magnet 22 to between 0.2% and 1.5%.

[0049] According to some embodiments of the present utility model, the remanence of the magnet 22 at 20°C is Br. Among them, if the copper loss of the motor 100 is greater than the iron loss of the motor 100, it will affect the working efficiency of the motor 100. The designer can increase the remanence of the magnet 22 to ensure the working efficiency of the motor 100. If the iron loss of the motor 100 is greater than the copper loss of the motor 100, it will also affect the working efficiency of the motor 100. The designer can reduce the remanence of the magnet 22 to ensure the working efficiency of the motor 100.

[0050] Therefore, the remanence of the magnet 22 at 20°C can be limited between 1.28T and 1.5T. Br can be any one of the point values of 1.28T, 1.3T, 1.4T, 1.5T or the range value between any two of them, so that the designer can determine the remanence of the magnet 22 according to the difference between the current iron loss and copper loss of the motor 100 to ensure the working efficiency of the motor 100.

[0051] According to some embodiments of the present utility model, the outer diameter of the stator 10 is d1, and the inner diameter of the stator 10 is d2. If the ratio of the outer diameter of the stator 10 to the inner diameter of the stator 10 is too large, it will increase the cost of the magnet 22, and it is easy to make the difference between the copper loss and the iron loss of the motor 100 too large, affecting the working efficiency of the motor 10. If the ratio of the outer diameter of the stator 10 to the inner diameter of the stator 10 is too small, it will increase the amount of copper wire used in the motor 100, and it is easy to make the difference between the copper loss and the iron loss of the motor 100 too large, affecting the working efficiency of the motor 10.

[0052] Therefore, the ratio of the outer diameter of the stator 10 to the inner diameter of the stator 10 can be limited between 0.49 and 0.64. d1 / d2 can be any one of the point values of 0.49, 0.50, 0.55, 0.60, 0.64 or the range value between any two of them, which can reduce the difference between the copper loss and the iron loss of the motor 100 and improve the working efficiency of the motor 100.

[0053] According to some embodiments of the present utility model, the number of magnets 22 per pole of the rotor 20 is 1, which can make the motor 100 reach a higher torque under a certain excitation current, and can increase the maximum value of the rotational speed of the motor 100, improving the performance of the motor 100. It can be understood that on the cross-section perpendicular to the rotational axis of the rotor 20, the magnet slot 211 can extend along the radial direction perpendicular to the rotor core 21.

[0054] As Figure 1 and Figure 2 shown, according to some embodiments of the present utility model, the number of magnets 22 per pole of the rotor 20 is 2, and the two magnets 22 in each pole of the magnet 22 have an included angle, which is beneficial to improving the magnetic focusing effect of the rotor 20, making the magnetic flux in the rotor 20 part more concentrated, and is beneficial to improving the output power of the motor 100.

[0055] It can be understood that the magnet slot 211 includes a first slot section 2111 and a second slot section 2112. In a cross-section perpendicular to the rotation axis of the rotor 20 and along the direction of the rotation center of the rotor 20 approaching the stator 10, the first slot section 2111 and the second slot section 2112 are away from each other. For example, the first slot section 2111 and the second slot section 2112 of each magnet slot 211 extend along the same radial direction inclined to the rotor 20, and the angles between the first slot section 2111 and the same radial direction and between the second slot section 2112 and the same radial direction are the same, that is, the first slot section 2111 and the second slot section 2112 are symmetrically arranged with respect to the same radial axis.

[0056] As Figure 1 shown, in some examples, the stator 10 has a plurality of stator slots 11 for accommodating the windings of the stator 10, which can improve the fixing effect of the windings, reduce the probability of winding loosening, and is beneficial to improving the heat dissipation effect of the windings and enhancing the performance of the motor 100.

[0057] The number of stator slots 11 is Q, and the number of poles of the rotor 20 is 2p. By limiting 2p / Q to 2 / 3, the distribution of the magnetic field can be made more uniform, the iron loss and copper loss can be reduced, the working efficiency of the motor 100 can be improved, and at the same time, the electromagnetic fluctuation during the operation of the motor 100 can be reduced, making the operation of the motor 100 more stable; of course, by optimizing the ratio of the number of poles of the rotor 20 to the number of stator slots 11, the noise and vibration during the operation of the motor 100 can also be reduced, and the working stability of the motor 100 can be enhanced.

[0058] For example, the number of poles of the rotor 20 can be 8, and the number of stator slots 11 can be 12; the number of poles of the rotor 20 can be 10, and the number of stator slots 11 can be 15; the number of poles of the rotor 20 can be 12, and the number of stator slots 11 can be 18.

[0059] In some examples, the number of stator slots 11 is Q, and the number of poles of the rotor 20 is 2p. The vibration level of the motor 100 is inversely proportional to the order of the minimum electromagnetic force generated by the motor 100. GCD(Q, 2p) is the greatest common divisor of the number of stator slots 11 and the number of poles of the rotor 20, and GCD(Q, 2p) can represent the order of the minimum electromagnetic force generated by the motor 100. The designer can choose the number of poles of the rotor 20 to be 10. At the same time, in order to simplify the electric control and make the winding more regular, the designer can choose the number of stator slots 11 to be 15. Thus, by setting the number of stator slots 11 to 15 and the number of poles of the rotor 20 to 10, the vibration and noise of the motor 100 can be reduced, and the electric control of the motor 100 can be simplified, making the winding more regular and facilitating manufacturing.

[0060] In some examples, Figure 4It is a comparison chart of the cost and efficiency of the motor 100. After observing the attached Figure 4 it can be seen that when the rotational speed of the motor 100 reaches 30 revolutions per second, the efficiency of the motor of the existing technical solution is 89.0%, while the efficiency of the motor 100 of the technical solution of the present application is 89.1%. When the rotational speed of the motor 100 reaches 60 revolutions per second, the efficiency of the motor of the existing technical solution is 91.6%, and the efficiency of the motor 100 of the technical solution of the present application is 91.6%. That is, the efficiency of the motor 100 of the technical solution of the present application is roughly the same as that of the motor of the existing technical solution.

[0061] However, the magnet cost of the motor of the existing technical solution is 12.3 yuan, and the magnet 22 cost of the motor 100 of the technical solution of the present application is 10.9 yuan. Therefore, by adopting the motor 100 of the technical solution of the present application, on the basis of ensuring the efficiency of the motor 100, the use of heavy rare earth elements in the motor 100 can be reduced, the cost of the magnet 22 can be lowered, and the cost performance of the motor 100 can be improved.

[0062] In some examples, Figure 5 It is a comparison chart of Hcj(L / D) / 1000 of the motor 100 and the demagnetization rate. After observing the attached Figure 5 it can be seen that Hcj(L / D) / 1000 of the motor of the existing technical solution is 1.78 kA / m, and Hcj(L / D) / 1000 of the motor 100 of the technical solution of the present application is 1.56 kA / m. That is, Hcj(L / D) / 1000 of the motor 100 of the technical solution of the present application is less than that of the motor of the existing technical solution.

[0063] The demagnetization rate of the magnet of the motor of the existing technical solution is 2.5%, and the demagnetization rate of the magnet 22 of the motor 100 of the technical solution of the present application is 2.1%. That is, the demagnetization rate of the magnet 22 of the motor 100 of the technical solution of the present application is less than that of the magnet of the motor of the existing technical solution. Therefore, by adopting the motor 100 of the technical solution of the present application, Hcj(L / D) / 1000 of the motor 100 can be reduced. For example, the demagnetization factor of the motor 100 can be reduced, the demagnetization rate of the magnet 22 can be lowered, and the demagnetization reliability of the magnet 22 can be improved.

[0064] In this application, the demagnetization experiment operation method and the demagnetization rate calculation method are as follows: First, the operator places the magnetically saturated rotor assembly in a room temperature environment, and can measure the magnetic flux φ0 of the rotor assembly. Then, the operator places the rotor assembly after measuring the initial magnetic flux in an incubator, and the placement duration is more than 4 hours, and sets the temperature of the incubator according to the specified temperature (130 °C). Next, the operator connects the test DC motor to the DC power supply, and determines the demagnetization current (such as 35 A, 40 A, etc.) according to the preset demagnetization current value. After preparation, the operator takes out the rotor assembly from the incubator and installs it on the demagnetization test fixture. Under the action of the DC demagnetization current, the rotor assembly rotates one week. Finally, after the test is completed, the operator places the rotor assembly in a normal temperature environment, and the placement duration is more than 4 hours. The operator can measure the temperature of the rotor assembly and the magnetic flux φ1 after demagnetization, and calculate the demagnetization rate. The calculation formula is as follows: The demagnetization rate is ((φ1 - φ0) / φ0) * 100%, where when calculating, the operator needs to use the same temperature for φ1 as for φ0.

[0065] As Figure 3 shown, the compressor 1000 according to an embodiment of the present invention includes a motor 100. By adopting the above motor 100, on the basis of improving the working efficiency and demagnetization reliability of the compressor 1000, the use of heavy rare earth materials can be reduced, the cost of the compressor 1000 can be lowered, and the cost performance of the compressor 1000 can be improved.

[0066] As Figure 3 shown, the refrigeration device 10000 according to an embodiment of the present invention includes a motor 100 or a compressor 1000. By adopting the above motor 100 or compressor 1000, on the basis of improving the working efficiency and demagnetization reliability of the refrigeration device 10000, the use of heavy rare earth materials can be reduced, the cost of the refrigeration device 10000 can be lowered, and the cost performance of the refrigeration device 10000 can be improved.

[0067] According to some embodiments of the present invention, the refrigeration device 10000 can be an air conditioner, a refrigerator, a vehicle, or the like.

[0068] Other components and operations of the refrigeration device 10000 according to the embodiments of the present invention are known to those of ordinary skill in the art and will not be described in detail here. In the description of the present invention, the "first feature" and the "second feature" may include one or more of such features. Among them, the up-down direction, the left-right direction, and the front-back direction are based on the up-down direction, the left-right direction, and the front-back direction shown in the figure.

[0069] In the description of the present utility model, unless otherwise clearly defined and limited, the first feature being "above" or "below" the second feature may include the direct contact between the first and second features, or may include the indirect contact between the first and second features through additional features therebetween. Moreover, the first feature being "above", "over" and "on" the second feature includes that the first feature is directly above and obliquely above the second feature, or merely means that the horizontal height of the first feature is higher than that of the second feature.

[0070] In the description of this specification, the description of reference terms such as "one embodiment", "some embodiments", "schematic embodiments", "examples", "specific examples", or "some examples", etc. 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 utility model. In this specification, the schematic expressions 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.

[0071] Although the embodiments of the present utility model 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 spirit of the present utility model, and the scope of the present utility model is defined by the claims and their equivalents.

Claims

1. A motor, characterized in that, Comprising: A stator; A rotor, the rotor being disposed within the inner cavity of the stator, the rotor including a rotor core and magnets, the rotor core having a plurality of magnet slots, the plurality of magnet slots being arranged at intervals along the circumferential direction of the rotor core, and the magnets being adapted to be installed within the magnet slots. Wherein, the outer diameter of the rotor is D, and in a cross-section perpendicular to the rotational axis of the rotor, the minimum distance between each magnet and the rotational center of the rotor is L, and the intrinsic coercivity of the magnet is Hcj, satisfying: 0.975 kA / m ≤ Hcj(L / D) / 1000 ≤ 1.71 kA / m, and Hcj ≤ 1800 kA / m.

2. The motor according to claim 1, characterized in that, The outer diameter of the rotor is D, satisfying: 49 mm ≤ D ≤ 81 mm.

3. The motor according to claim 2, characterized in that, The minimum distance between each magnet and the rotational center of the rotor is L, satisfying: 16 mm ≤ L ≤ 35 mm.

4. The motor according to claim 1, characterized in that, The magnet contains heavy rare earth elements, and the mass percentage of the heavy rare earth elements in the magnet is M, 0.2% ≤ M ≤ 1.5%.

5. The motor according to claim 4, characterized in that, The heavy rare earth elements include at least one of dysprosium and terbium.

6. The motor according to claim 1, characterized in that, The remanence of the magnet at 20 °C is Br, satisfying: 1.28 T ≤ Br ≤ 1.5 T.

7. The motor according to claim 1, wherein The outer diameter of the stator is d1, and the inner diameter of the stator is d2, 0.49 ≤ d1 / d2 ≤ 0.

64.

8. The motor according to claim 1, characterized in that, The number of magnets per pole of the rotor is 1.

9. The motor according to claim 1, characterized in that, The number of magnets per pole of the rotor is 2, and the two magnets in each pole of the magnets have an included angle.

10. The electric machine according to any one of claims 1-9, characterized in that, The stator has a plurality of stator slots, the number of stator slots is Q, and the number of poles of the rotor is 2p, satisfying: 2p / Q = 2 / 3.

11. The motor according to claim 10, characterized in that, The number of stator slots is Q, and the number of poles of the rotor is 2p, satisfying: Q = 15, 2p = 10.

12. A compressor, characterized in that, Comprising the motor according to any one of claims 1 - 11.

13. A refrigeration device, characterized in that, Comprising the motor according to any one of claims 1 - 11, or, comprising the compressor according to claim 12.

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