Permanent magnet motor, compressor and refrigeration equipment

Abstract

The utility model discloses a permanent magnet motor, compressor and refrigeration equipment relates to refrigeration equipment technical field, the permanent magnet motor includes stator and rotor, rotor includes rotor core and permanent magnet, rotor core is equipped with the magnet slot, permanent magnet is located in the magnet slot, rotor core's maximum outer radius is R1, R2 is the maximum outer radius, R3 is the maximum outer radius, R4 is the maximum outer radius, R3 is the maximum outer radius, and R4 is the maximum outer radius. The sum of the widths of the permanent magnets corresponding to each magnetic pole is L1, the thickness of each permanent magnet is L2, and the number of the magnetic poles of the rotor is P. The technical scheme provided by the utility model balances the cost and the performance of the motor.

Description

Technical Field

[0001] The utility model relates to the technical field of refrigeration equipment, and particularly relates to a permanent magnet motor, a compressor and a refrigeration equipment. Background Art

[0002] As an important device for converting electrical energy into mechanical energy, the motor plays a key role in many fields such as compressors, refrigeration equipment, and household appliances. The motor mainly consists of a stator assembly and a rotor assembly. A rotating magnetic field is generated by the current in the stator winding, which interacts with the rotor magnets in the rotor assembly to generate a rotating torque. However, the existing motors will significantly increase the production cost of the motor while improving the rotating torque of the motor and controlling the risk of demagnetization of the permanent magnet, thus not meeting the design requirements. Summary of the Utility Model

[0003] The main object of the utility model is to propose a permanent magnet motor, a compressor and a refrigeration equipment, aiming to balance the cost and performance of the motor.

[0004] To achieve the above object, the permanent magnet motor proposed by the utility model includes:

[0005] A stator; and

[0006] A rotor, the rotor includes a rotor core and a permanent magnet. A magnet slot is provided on the rotor core, the permanent magnet is located in the magnet slot, the maximum outer radius of the rotor core is R 1 , the sum of the widths of the permanent magnets corresponding to each magnetic pole is L 1 , the thickness of the permanent magnet is L 2 , the number of magnetic poles of the rotor is P,

[0007] In an embodiment,

[0008] In an embodiment, a shaft hole is provided on the rotor core, and the minimum radius of the shaft hole is R 2 ,

[0009] In an embodiment,

[0010] In an embodiment,

[0011] In an embodiment,

[0012] In an embodiment, 10 ≤ P ≤ 12.

[0013] In an embodiment, 14 mm ≤ L 1 ≤ 23 mm.

[0014] In one embodiment, 1.1 mm ≤ L 2 ≤ 1.8 mm.

[0015] In one embodiment, 23 mm ≤ R 1 ≤ 34 mm.

[0016] In one embodiment, a shaft hole is provided on the rotor core, and the minimum radius of the shaft hole is R 2 , 5 mm ≤ R 2 ≤ 8 mm.

[0017] In one embodiment, the stator includes a stator yoke, a plurality of stator teeth and a plurality of tooth shoes. The plurality of stator teeth are spaced on the inner circumferential surface of the stator yoke. The tooth shoes are connected to one end of the stator teeth away from the stator yoke. One stator tooth corresponds to one tooth shoe, and the stator teeth and the stator yoke enclose a stator slot.

[0018] In one embodiment, the number of the stator slots is Q, and 15 ≤ Q ≤ 18.

[0019] In one embodiment, the number of the stator slots is Q, and the number of phases of the permanent magnet motor is m, 0 < Q / mP < 1.

[0020] The present utility model also provides a compressor, including the permanent magnet motor as described above.

[0021] The present utility model also provides a refrigeration device, including the compressor as described above.

[0022] The permanent magnet motor in the technical solution of the present utility model includes a stator and a rotor. The rotor includes a rotor core and a permanent magnet. A magnet slot is provided on the rotor core. The permanent magnet is located in the magnet slot. The maximum outer radius of the rotor core is R 1 , the sum of the widths of the permanent magnets corresponding to each magnetic pole is L 1 , the thickness of the permanent magnet is L 2 , and the number of magnetic poles of the rotor is P, wherein, L 1 × L 2 represents the sum of the areas of the permanent magnets corresponding to each magnetic pole, represents the area of the rotor. By taking The amount of permanent magnets is reduced, thus reducing the manufacturing cost of the motor; the more poles the motor has, the lower the efficiency of the motor; increasing the outer diameter of the rotor increases the air-gap area of the motor, thereby increasing the magnetic flux and the rotational torque. At the same time, when the outer diameter of the rotor is reasonably increased, the heat dissipation structure of the motor can be optimized, thus reducing the temperature of the permanent magnets and further controlling the risk of demagnetization; therefore, by reasonably reducing the amount of permanent magnets, reducing the number of poles of the motor, and increasing the outer diameter of the rotor, the cost and performance of the motor are balanced. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on the structures shown in these drawings.

[0024] Figure 1 Schematic structural diagram of an embodiment of a permanent magnet motor provided by the present invention;

[0025] Figure 2 is Figure 1 Schematic structural diagram of the permanent magnets in a one-word shape;

[0026] Figure 3 is Figure 1 Schematic structural diagram of the permanent magnets in a V-shape;

[0027] Figure 4 is Figure 1 Schematic structural diagram of the permanent magnets in a U-shape;

[0028] Figure 5 Performance and cost of the permanent magnet motor provided by the present invention vary with value;

[0029] Figure 6 Output torque and demagnetization rate of the permanent magnet motor provided by the present invention vary with value;

[0030] Figure 7 Output torque and demagnetization rate of the permanent magnet motor provided by the present invention vary with L 2 / 2R 1 value;

[0031] Figure 8 is Figure 1 Schematic structural diagram of an embodiment of the shaft hole;

[0032] Figure 9 is Figure 1Structural schematic diagram of another embodiment of the central rotating shaft hole.

[0033] Explanation of the reference numerals in the drawings:

[0034] 11. Stator yoke; 12. Stator teeth; 13. Tooth shoes; 14. Stator slots; 21. Rotor core; 211. Magnet slots; 212. Rotating shaft hole; 22. Permanent magnet.

[0035] The realization of the purpose, functional characteristics and advantages of the present utility model will be further described in conjunction with the embodiments and with reference to the accompanying drawings. Specific embodiments

[0036] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0037] It should be noted that if there are directional indications (such as up, down, left, right, front, back...) in the embodiments of the present utility model, the directional indications are only used to explain the relative positional relationship and movement conditions between components in a specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0038] In addition, if there are descriptions such as "first", "second", etc. in the embodiments of the present utility model, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of the features. In addition, if "and / or" or "and / or" appears throughout the text, its meaning includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or a solution where A and B are satisfied simultaneously. In addition, the technical solutions between the embodiments can be combined with each other, but it must be based on the fact that those of ordinary skill in the art can implement them. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the protection scope required by the present utility model.

[0039] Refer to Figures 1 to 5 , the present utility model provides a permanent magnet motor, including:

[0040] A stator; and

[0041] Rotor, the rotor includes a rotor core 21 and a permanent magnet 22, the rotor core 21 is provided with magnet slots 211, the permanent magnet 22 is located in the magnet slots 211, and the maximum outer radius of the rotor core 21 is R 1 , the sum of the widths of the permanent magnets 22 corresponding to each magnetic pole is L 1 , the thickness of the permanent magnet 22 is L 2 , the number of magnetic poles of the rotor is P,

[0042] The permanent magnet motor in the technical solution of the present utility model includes a stator and a rotor. The rotor includes a rotor core 21 and a permanent magnet 22. The rotor core 21 is provided with magnet slots 211. The permanent magnet 22 is located in the magnet slots 211. The maximum outer radius of the rotor core 21 is R 1 , the thickness of the permanent magnet 22 is L 2 , the sum of the widths of the permanent magnets 22 corresponding to each magnetic pole is L 1 , the number of magnetic poles of the rotor is P, wherein, L 1 ×L 2 represents the sum of the areas of the permanent magnets 22 corresponding to each magnetic pole, represents the area of the rotor. By the amount of the permanent magnet 22 is reduced, thereby reducing the manufacturing cost of the motor; the more magnetic poles the motor has, the lower the efficiency of the motor; increasing the outer diameter of the rotor increases the air gap area of the motor, thereby increasing the magnetic flux and the rotational torque. At the same time, when the outer diameter of the rotor is reasonably increased, the heat dissipation structure of the motor can be optimized, thereby reducing the temperature of the permanent magnet 22 and further controlling the demagnetization risk; therefore, by reasonably reducing the amount of the permanent magnet 22, reducing the number of magnetic poles of the motor and increasing the outer diameter of the rotor, the cost and performance of the motor are balanced. It should be noted that multiplying the formula by 1000 is to amplify the value of the whole formula.

[0043] wherein, it should be noted that L 1 is the sum of the widths of the permanent magnets 22 corresponding to each magnetic pole, that is, when each magnetic pole corresponds to a permanent magnet 22, referring to Figure 2 , at this time the permanent magnet 22 is in a straight shape, L 1 =a; when each magnetic pole corresponds to two permanent magnets 22, referring to Figure 3 , at this time the permanent magnet 22 is in a V shape, L 1 =a + b; when each magnetic pole corresponds to three permanent magnets 22, referring to Figure 4 , at this time the permanent magnet 22 is in a U shape, L 1 =a + b + c. And so on, which will not be elaborated in detail here.

[0044] Furthermore, By further optimizing the amount of the permanent magnet 22, the number of magnetic poles of the motor, and the outer diameter of the rotor, the cost and performance of the motor are further balanced. As can be seen from Figure 5 When Within the range, the performance of the motor is at a relatively high level, while the cost is at a relatively low level. When , the performance of the motor can meet the actual requirements, and the cost is further reduced.

[0045] Referring to Figure 6 , in one embodiment, a shaft hole 212 is provided on the rotor core 21, and the minimum radius of the shaft hole 212 is R 2 , It can be understood that 2(R 1 - R 2 ) is the outer diameter of the rotor core 21 minus the minimum diameter of the shaft hole 212, R 1 - R 2 is the thickness of the rotor core 21, L 2 is the thickness of the permanent magnet 22. represents the ratio of the thickness of the permanent magnet 22 to the thickness of the rotor core 21. Increasing the thickness of the permanent magnet 22 can increase the magnetic flux of the motor, thereby increasing the output torque of the motor.

[0046] If , it indicates that the proportion of the thickness of the permanent magnet 22 in the rotor core 21 is relatively large. First, the main material of the permanent magnet 22 is rare earth metal elements, and its cost is relatively high. Increasing the proportion of the permanent magnet 22 in the rotor core 21 increases the cost of the motor. Or R 1 - R 2 is the thickness of the rotor core 21 decreasing, and the outer radius R of the rotor 1 decreasing, resulting in a decrease in the maximum output torque of the motor and an increase in the demagnetization current, thereby affecting the output power of the motor. Secondly, the inner radius R of the rotor 2 is the dimension for the mutual fitting of the motor rotor and the compressor crankshaft component. If the shaft diameter is too large, the friction loss will increase, reducing the overall efficiency of the machine. Secondly, the amount of crankshaft material is increased, thereby affecting the overall cost of the machine.

[0047] If , it indicates that the proportion of the thickness of the permanent magnet 22 is relatively small, resulting in a decrease in the demagnetization resistance ability of the motor and a decrease in the amplitude of the anti-demagnetization current, thereby affecting the output power and reliability of the permanent magnet motor. Secondly, the insufficient thickness of the permanent magnet 22 may lead to a decrease in the amplitude of the air-gap magnetic density of the motor, thereby resulting in a problem of weakened maximum output torque ability. Or R 1 - R 2 is the thickness of the rotor core 21 increasing, and the inner radius R of the rotor 2is the dimension of the mutual nesting of the motor rotor and the compressor crankshaft component. If the shaft diameter is too small, it directly affects the torsional rigidity and service life of the crankshaft connecting component, and secondly, it affects the holding force of the rotor nesting. Therefore, by setting within a reasonable range, the relationship between cost and motor output power performance can be balanced on the premise of ensuring the output power.

[0048] Furthermore, the amount of the permanent magnet 22 is further reduced, thus reducing the cost of the motor; at the same time. By further optimizing the thickness of the permanent magnet 22 and the proportion of 2R 1 in the maximum outer diameter of the rotor core 21, the relationship between the motor cost and the motor performance is further balanced; secondly, the nesting relationship between the rotor shaft hole and the crankshaft of the pump body component can be taken into account, and the relationship between the overall machine efficiency, cost and reliability can be balanced.

[0049] Referring to Figure 7 , in one embodiment, wherein, L 2 is the thickness of the permanent magnet 22, 2R 1 is the maximum outer diameter of the rotor core 21, L 2 / 2R 1 represents the proportion of the thickness of the permanent magnet 22 in the rotor core 21. If it indicates that the proportion of the thickness of the permanent magnet 22 in the rotor core 21 is relatively large. First of all, the main material of the permanent magnet 22 is rare earth metal elements, and its cost is relatively high. Increasing the proportion of the permanent magnet 22 in the rotor core 21 increases the cost of the motor; secondly, the permanent magnet 22 is embedded in the middle of the rotor core and will generate a certain centripetal force during operation. If the thickness is too large, the weight of the permanent magnet increases, the centripetal force increases, and the deformation of the outer circle of the rotor core deteriorates. If it enters the high-speed working condition, there is a risk of fracture of the magnetic bridge of the rotor core, which will affect the performance and service life of the motor; furthermore, the maximum outer diameter 2R 1 of the rotor core 21 decreases, resulting in a decrease in the output torque of the motor, which in turn affects the output power of the motor. If L 2 / 2R 1 <0.015, it indicates that the proportion of the thickness of the permanent magnet 22 is relatively small, which leads to a decrease in the demagnetization resistance of the motor, a decrease in the amplitude of the demagnetization-resistant current, and thus affects the output power and reliability of the permanent magnet motor; secondly, the insufficient thickness of the permanent magnet 22 may lead to a decrease in the amplitude of the air-gap magnetic density of the motor, which in turn causes the problem of weakening the maximum output torque capacity. Therefore, by setting 0.015≤L 2 / 2R 1 ≤0.025 within a reasonable range, the relationship between cost and performance can be balanced on the premise of ensuring the output power.

[0050] Furthermore, 0.018≤L 2 / 2R1 ≤0.023. This further reduces the amount of permanent magnet 22, thereby reducing the cost of the motor; at the same time. By further optimizing the thickness of the permanent magnet 22 and 2R 1 It is the proportion of the maximum outer diameter of the rotor core 21, thereby further balancing the relationship between the motor cost and the motor performance.

[0051] In one embodiment, 10≤P≤12. A motor with a pole number P between 10 and 12 can achieve a better balance between torque and speed. Compared with a motor with a smaller number of poles, a motor with a pole number P between 10 and 12 has higher torque and lower speed, and is suitable for application scenarios requiring high torque and lower speed. Compared with a motor with a larger number of poles, a motor with a pole number P between 10 and 12 can avoid problems such as an increase in motor body and rotor inertia due to too many poles, thereby maintaining a higher efficiency.

[0052] Specifically, 14mm≤L 1 ≤23mm. If L 1 >23mm, it means that the sum of the widths of the permanent magnets 22 corresponding to each magnetic pole is too large. Since the cost of the permanent magnets 22 is relatively high, a permanent magnet 22 with too large a width will increase the cost of the motor. Secondly, the increase in the width of the permanent magnets 22 may cause uneven heat distribution inside the motor, increase the difficulty of heat dissipation, and thus affect the operating efficiency and stability of the motor. 1 <14mm, it means that the sum of the widths of the permanent magnets 22 corresponding to each magnetic pole is too small, which makes the output power of the motor low; at the same time, too small a width of the permanent magnets 22 may cause the motor to be more prone to fluctuations and instability when it is disturbed by the outside world during operation. 1 ≤23mm, thereby optimizing the magnetic field distribution, ensuring the output power of the motor, reducing the amount of permanent magnet 22, and thus reducing the production cost of the motor.

[0053] Specifically, 1.1mm≤L 2 ≤1.8mm. If L 2 >1.8mm, it means that the thickness of the permanent magnet 22 is too large. Since the cost of the permanent magnet 22 is relatively high, a thicker permanent magnet 22 will increase the cost of the motor. Secondly, the increase in the thickness of the permanent magnet 22 may cause uneven heat distribution inside the motor, increase the difficulty of heat dissipation, and further affect the operating efficiency and stability of the motor. 2 <1.1mm, it means that the thickness of the permanent magnet 22 is too small, so that the output power of the motor is low; at the same time, too small a thickness of the permanent magnet 22 may cause the motor to be more prone to fluctuations and instability when it is disturbed by the outside world during operation. 2Within the range of ≤ 1.8 mm, the magnetic field distribution is optimized, the output power of the motor is ensured, the usage amount of the permanent magnet 22 is reduced, and thus the manufacturing cost of the motor is lowered.

[0054] Specifically, 23 mm ≤ R 1 ≤ 34 mm. If R 1 > 34 mm, it indicates that the outer diameter of the rotor is too large. The increase in the rotor outer diameter will cause the moment of inertia of the motor to increase. The increase in the moment of inertia means that the motor needs to overcome a greater inertial force when changing its motion state (such as starting, stopping, or changing the speed), which will lead to a decrease in the response speed of the motor; at the same time, the increase in the rotor outer diameter usually causes the magnetic flux density of the motor core to become smaller, and the decrease in the magnetic flux density will weaken the magnetic coupling between the core and the copper wire. However, at the same time, due to the increase in the core volume, the total iron loss may increase. If R 1 < 23 mm, it indicates that the outer diameter of the rotor is too small. The decrease in the rotor outer diameter will reduce the air gap area and magnetic flux of the motor, thereby reducing the output torque of the motor. At the same time, too small a rotor outer diameter may cause restricted air flow inside the motor, thereby affecting the heat dissipation effect of the motor, causing the temperature of the motor to rise during operation and the efficiency to decrease. Therefore, within the range of 23 mm ≤ R 1 ≤ 34 mm, the torque output of the motor is optimized, the iron core is reduced, and thus the efficiency of the motor is improved.

[0055] Referring to Figure 8 and Figure 9 , specifically, a shaft hole 212 is provided on the rotor core 21, and the minimum radius of the shaft hole 212 is R 2 , 5 mm ≤ R 2 ≤ 8 mm. It can be understood that the larger the shaft hole 212, the larger the corresponding shaft of the shaft hole 212, which means the greater the torque required by the motor; when the thickness of the permanent magnet 22, the width of the permanent magnet 22, and the rotor outer diameter remain unchanged; if R 2 > 8 mm, when the shaft is made of non-magnetic material (such as stainless steel material) and the rotor magnetic density is relatively saturated, the increase in the diameter of the shaft hole 212 will cause the magnetic density of the rotor yoke to become further saturated; this will increase the excitation current of the motor, reduce the power factor, and may cause the current to be too large and burn out the motor; at the same time, magnetic density saturation will also increase the core loss and copper loss of the motor, reducing the efficiency of the motor. If R 2 < 5 mm, too small a shaft hole 212 may cause stress concentration. During the operation of the motor, the shaft will be subjected to various forces. If the diameter of the shaft hole 212 is too small, a large stress concentration will occur at the hole edge, thereby increasing the risk of shaft fracture.

[0056] Specifically, the stator includes a stator yoke 11, a plurality of stator teeth 12, and a plurality of tooth shoes 13. The plurality of stator teeth 12 are spaced apart on the inner circumferential surface of the stator yoke 11. The tooth shoes 13 are connected to one end of the stator teeth 12 away from the stator yoke 11. One stator tooth 12 corresponds to one tooth shoe 13. The stator tooth 12 and the stator yoke 11 enclose a stator slot 14.

[0057] Further, the number of stator slots 14 is Q, where 15 ≤ Q ≤ 18. It can be understood that the number of slots Q of the stator slots 14 within this range can provide relatively balanced performance. It is neither too few to affect the efficiency and torque of the motor, nor too many to cause a significant increase in manufacturing cost. Moreover, limiting the number of slots Q of the stator slots 14 between 15 and 18 helps to provide a more uniform magnetic field distribution, thereby reducing the non-uniformity of the magnetic field and improving the efficiency and performance of the motor. Secondly, limiting the number of slots Q of the stator slots 14 between 15 and 18 can make the magnetic field of the motor more uniform, reduce the fluctuation of the magnetic field, and thus reduce the noise of the motor. At the same time, it also helps to reduce the vibration of the motor. Compared with motors with a higher number of slots, motors with 15 to 18 slots may have an advantage in manufacturing cost because they do not require excessive winding coils and insulating materials, reducing the manufacturing difficulty and cost. Limiting the number of slots Q of the stator slots 14 between 15 and 18 can improve the efficiency and torque density of the motor. Although increasing the number of slots Q of the stator slots 14 can further improve these performance parameters, relatively high efficiency and torque can already be achieved within the range of 15 to 18.

[0058] Specifically, the number of the stator slots 14 is Q, the number of phases of the permanent magnet motor is m, and 0 < Q / mP < 1. The number of slots per pole per phase is equal to the ratio of the number of slots of the stator slots 14 to the product of the number of pole pairs of the rotor and the number of phases of the motor multiplied by a certain multiple, and 0 < Q / mP < 1 is satisfied, so that a fractional-slot motor can be formed as a whole. Under the action of the fractional-slot motor, the cogging torque induced by the rotor permanent magnet magnetic field can be effectively weakened. Moreover, the fractional-slot motor can effectively increase the equivalent number of slots per pole per phase. This means that under the same number of slots, the fractional-slot motor can obtain better distribution performance, making the motor waveform closer to a sine wave. This helps to improve the efficiency and performance of the motor. Secondly, the fractional-slot motor can effectively weaken the per-pole magnetic flux pulsation caused by the change of the air-gap permeance, thereby reducing the pulsation amplitude. This helps to improve the electromotive force waveform and reduce the pulsation loss, and improve the operating efficiency and stability of the motor. Since the fractional-slot motor uses fewer slots to obtain the same distribution performance as an integral-slot winding with a large number of slots, its number of slots is relatively small, and it has good processability. This helps to reduce the manufacturing cost of the motor and improve the production efficiency. Furthermore, the torque characteristics of the fractional-slot motor are generally good, and the torque ripple is small. This is because the fractional-slot motor can optimize the magnetic field distribution, reduce the harmonic components, and thus reduce the torque ripple. This makes the fractional-slot motor have an advantage in occasions where high-precision control and stable operation are required.

[0059] The present invention also provides a compressor, which includes a permanent magnet motor. The specific structure of the permanent magnet motor refers to the above embodiments. Since the compressor in the technical solution of the present invention adopts all the technical solutions of the above embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, and will not be described in detail herein.

[0060] The present invention also provides a refrigeration device, which includes a compressor. The specific structure of the compressor refers to the above embodiments. Refrigeration devices can be divided into compression refrigeration devices, absorption refrigeration devices, steam jet refrigeration devices, heat pump refrigeration devices, electrothermal refrigeration devices, etc. The refrigeration device mainly consists of a compressor, an expansion valve, an evaporator, a condenser, and accessories and pipelines. Such as refrigerators, air conditioners, etc. Since the compressor in the technical solution of the present invention adopts all the technical solutions of the above embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, and will not be described in detail herein.

[0061] The above description is only an exemplary embodiment of the present invention, and does not limit the patent scope of the present invention. Any equivalent structural transformation made under the technical concept of the present invention by using the content of the specification and drawings of the present invention, or directly / indirectly applied to other related technical fields, is included in the patent protection scope of the present invention.

Claims

1. A permanent magnet motor, characterized in that: include: stator; and A rotor, wherein the rotor comprises a rotor core and a permanent magnet, wherein a magnet slot is provided on the rotor core, wherein the permanent magnet is located in the magnet slot, wherein the maximum outer radius of the rotor core is R1, wherein the sum of the widths of the permanent magnets corresponding to each magnetic pole is L1, wherein the thickness of the permanent magnet is L2, and wherein the number of magnetic poles of the rotor is P, 2. The permanent magnet motor according to claim 1, characterized in that:

3. The permanent magnet motor according to claim 1, characterized in that: The rotor core is provided with a shaft hole, and the minimum radius of the shaft hole is R2.

4. The permanent magnet motor according to claim 3, characterized in that:

5. The permanent magnet motor according to claim 1, characterized in that:

6. The permanent magnet motor according to claim 5, characterized in that:

7. The permanent magnet motor according to claim 1, characterized in that: 10≤P≤12。 8. The permanent magnet motor according to claim 1, characterized in that: 14mm≤L1≤23mm.

9. The permanent magnet motor according to claim 1, characterized in that: 1.1mm≤L2≤1.8mm.

10. The permanent magnet motor according to claim 1, characterized in that: 23mm≤R1≤34mm.

11. The permanent magnet motor according to claim 1, characterized in that: The rotor core is provided with a shaft hole, the minimum radius of the shaft hole is R2, 5mm≤R2≤8mm.

12. The permanent magnet motor according to claim 1, characterized in that: The stator includes a stator yoke, a plurality of stator teeth and a plurality of tooth shoes. The plurality of stator teeth are arranged at intervals on the inner circumferential surface of the stator yoke. The tooth shoe is connected to one end of the stator tooth away from the stator yoke. One stator tooth is arranged corresponding to one tooth shoe. The stator teeth and the stator yoke are combined to form a stator slot.

13. The permanent magnet motor according to claim 12, characterized in that: The number of the stator slots is Q, 15≤Q≤18.

14. The permanent magnet motor according to claim 12, characterized in that: The number of the stator slots is Q, the number of phases of the permanent magnet motor is m, and 0<Q / mP<1.

15. A compressor, characterized in that: It comprises a permanent magnet motor as claimed in any one of claims 1 to 14.

16. A refrigeration device, characterized in that: Comprising the compressor of claim 15.

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