Permanent magnet motor, compressor and refrigeration equipment

Abstract

The invention discloses a permanent magnet motor, a compressor and refrigeration equipment, and relates to the technical field of refrigeration equipment, the permanent magnet motor comprises a stator and a rotor, the rotor comprises a rotor iron core and permanent magnets, magnet grooves are formed in the rotor iron core, the permanent magnets are located in the magnet grooves, the maximum outer radius of the rotor iron core is R1, and the maximum outer radius of the rotor iron core is R2; 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. According to the technical scheme provided by the invention, the cost and the performance of the motor are balanced.

Description

Technical Field

[0001] This invention relates to the technical field of refrigeration equipment, and particularly to a permanent magnet motor, a compressor, and refrigeration equipment. Background Technology

[0002] As a crucial device for converting electrical energy into mechanical energy, the electric motor plays a key role in various fields such as compressors, refrigeration equipment, and household appliances. An electric motor mainly consists of a stator assembly and a rotor assembly. The rotating magnetic field generated by the current in the stator windings interacts with the rotor magnets in the rotor assembly, thereby producing rotational torque. However, current electric motor technologies, while improving rotational torque and controlling the risk of permanent magnet demagnetization, significantly increase production costs, thus failing to meet design requirements. Summary of the Invention

[0003] The main objective of this invention is to provide a permanent magnet motor, compressor, and refrigeration equipment that balances motor cost and performance.

[0004] To achieve the above objectives, the present invention proposes a permanent magnet motor comprising:

[0005] Stator; and

[0006] The rotor includes a rotor core and permanent magnets. The rotor core has magnet slots, and the permanent magnets are located within these slots. The maximum outer radius of the rotor core is R1, the sum of the widths of the permanent magnets corresponding to each magnetic pole is L1, the thickness of the permanent magnets is L2, and the number of magnetic poles of the rotor is P.

[0007] In one implementation,

[0008] In one embodiment, the rotor core is provided with a shaft hole, the minimum radius of which is R2.

[0009] In one implementation,

[0010] In one implementation,

[0011] In one implementation,

[0012] In one implementation, 10 ≤ P ≤ 12.

[0013] In one embodiment, 14mm ≤ L1 ≤ 23mm.

[0014] In one embodiment, 1.1mm ≤ L2 ≤ 1.8mm.

[0015] In one embodiment, 23mm ≤ R1 ≤ 34mm.

[0016] In one embodiment, the rotor core is provided with a shaft hole, the minimum radius of which is R2, 5mm≤R2≤8mm.

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

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

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

[0020] The present invention also proposes a compressor comprising a permanent magnet motor as described above.

[0021] The present invention also proposes a refrigeration device, including the compressor described above.

[0022] The permanent magnet motor in the technical solution of this invention includes a stator and a rotor. The rotor includes a rotor core and permanent magnets. The rotor core has magnet slots, and the permanent magnets are located in the magnet slots. The maximum outer radius of the rotor core is R1, the sum of the widths of the permanent magnets corresponding to each magnetic pole is L1, the thickness of the permanent magnets is L2, and the number of magnetic poles of the rotor is P. Where L1×L2 represents the sum of the areas of the permanent magnets corresponding to each magnetic pole. The area of ​​the rotor is represented by... Reducing the amount of permanent magnets lowers the manufacturing cost of the motor; the more magnetic poles a motor has, the lower its efficiency; increasing the rotor's outer diameter increases the air gap area, which in turn increases the magnetic flux and rotational torque. At the same time, appropriately increasing the rotor's outer diameter can optimize the motor's heat dissipation structure, thereby reducing the temperature of the permanent magnets and controlling the risk of demagnetization. Therefore, by appropriately reducing the amount of permanent magnets, decreasing the number of magnetic poles, and increasing the rotor's outer diameter, a balance is struck between motor cost and performance. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0024] Figure 1 A schematic diagram of a permanent magnet motor according to an embodiment of the present invention;

[0025] Figure 2 for Figure 1 A schematic diagram of the I-shaped structure of the permanent magnet in the middle section;

[0026] Figure 3 for Figure 1 A schematic diagram of the V-shaped structure of the permanent magnet in the middle section;

[0027] Figure 4 for Figure 1 A schematic diagram of the U-shaped structure of the permanent magnet;

[0028] Figure 5 The performance and cost of the permanent magnet motor provided by this invention vary with A diagram illustrating the changes in values;

[0029] Figure 6 The output torque and demagnetization rate of the permanent magnet motor provided by this invention vary with... A diagram illustrating the changes in values;

[0030] Figure 7 A schematic diagram showing the variation of the output torque and demagnetization rate of the permanent magnet motor provided by the present invention with the value of L2 / 2R1;

[0031] Figure 8 for Figure 1 A schematic diagram of one embodiment of the transfer shaft hole;

[0032] Figure 9 for Figure 1 A schematic diagram of another embodiment of the rotating shaft hole.

[0033] Explanation of icon numbers:

[0034] 11. Stator yoke; 12. Stator teeth; 13. Tooth shoe; 14. Stator slot; 21. Rotor core; 211. Magnet slot; 212. Shaft hole; 22. Permanent magnet.

[0035] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0036] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

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

[0038] Furthermore, if the embodiments of this invention involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0039] Reference Figures 1 to 5 This invention proposes a permanent magnet motor, comprising:

[0040] Stator; and

[0041] The rotor includes a rotor core 21 and permanent magnets 22. The rotor core 21 has magnet slots 211, and the permanent magnets 22 are located within the magnet slots 211. The maximum outer radius of the rotor core 21 is R1, the sum of the widths of the permanent magnets 22 corresponding to each magnetic pole is L1, the thickness of the permanent magnets 22 is L2, and the number of magnetic poles of the rotor is P.

[0042] The permanent magnet motor in the technical solution of this invention includes a stator and a rotor. The rotor includes a rotor core 21 and permanent magnets 22. The rotor core 21 is provided with magnet slots 211, and the permanent magnets 22 are located in the magnet slots 211. The maximum outer radius of the rotor core 21 is R1, the thickness of the permanent magnets 22 is L2, the sum of the widths of the permanent magnets 22 corresponding to each magnetic pole is L1, and the number of magnetic poles of the rotor is P. Where L1×L2 represents the sum of the areas of the permanent magnets 22 corresponding to each magnetic pole. The area of ​​the rotor is represented by... Reducing the amount of permanent magnet 22 lowers the manufacturing cost of the motor. The more magnetic poles a motor has, the lower its efficiency. Increasing the rotor's outer diameter increases the air gap area, thereby increasing magnetic flux and rotational torque. Simultaneously, appropriately increasing the rotor's outer diameter optimizes the motor's heat dissipation structure, reducing the temperature of the permanent magnet 22 and controlling the risk of demagnetization. Therefore, by appropriately reducing the amount of permanent magnet 22, decreasing the number of magnetic poles, and increasing the rotor's outer diameter, a balance is struck between motor cost and performance. It should be noted that multiplying the formula by 1000 is to amplify the overall numerical value.

[0043] It should be noted that L1 is the sum of the widths of the permanent magnets 22 corresponding to each magnetic pole, that is, when each magnetic pole corresponds to one permanent magnet 22, refer to Figure 2 At this time, the permanent magnet 22 is in a straight line shape, L1 = a; when each magnetic pole corresponds to two permanent magnets 22, refer to Figure 3 At this time, the permanent magnet 22 is V-shaped, and L1 = a + b; when each magnetic pole corresponds to three permanent magnets 22, refer to Figure 4 At this point, the permanent magnet 22 is U-shaped, and L1 = a + b + c. This can be deduced further here.

[0044] Furthermore, By further optimizing the amount of permanent magnet 22, the number of magnetic poles in the motor, and the outer diameter of the rotor, the cost and performance of the motor were further balanced. Figure 5 It can be seen that when Within this range, the motor operates at a high performance level while its cost is low. And when... At this point, the motor's performance can meet the actual needs, and the cost has been further reduced.

[0045] Reference Figure 6 In one embodiment, the rotor core 21 is provided with a shaft hole 212, and the minimum radius of the shaft hole 212 is R2. Understandably, 2(R1-R2) is the outer diameter of the rotor core 21 minus the minimum diameter of the shaft hole 212, R1-R2 is the thickness of the rotor core 21, and L2 is the thickness of the permanent magnet 22. This 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] like This indicates that the thickness of the permanent magnet 22 accounts for a large proportion of the rotor core 21. Firstly, the main material of the permanent magnet 22 is rare earth metal elements, which have a high cost. This increases the proportion of the permanent magnet 22 in the rotor core 21, thereby increasing the cost of the motor. Alternatively, R1-R2 represents the reduction in the thickness of the rotor core 21, which reduces the outer radius R1 of the rotor, resulting in a decrease in the maximum output torque of the motor and an increase in the demagnetizing current, thus affecting the output power of the motor. Secondly, the inner radius R2 of the rotor is the size at which the motor rotor and the compressor crankshaft components fit together. If the shaft diameter is too large, it will increase friction loss and reduce the overall efficiency of the machine. Furthermore, it will increase the amount of crankshaft material used, thus affecting the overall cost of the machine.

[0047] like This indicates that the relatively small thickness of the permanent magnet 22 leads to a decrease in the motor's demagnetization resistance and the amplitude of the demagnetization current, thus affecting the output power and reliability of the permanent magnet motor. Secondly, insufficient thickness of the permanent magnet 22 may cause a decrease in the air gap magnetic flux density amplitude of the motor, resulting in a weakening of the maximum output torque capability. Alternatively, R1-R2 represents an increase in the thickness of the rotor core 21. The rotor inner circle R2 is the dimension at which the motor rotor and the compressor crankshaft components fit together. An excessively small shaft diameter directly affects the torsional rigidity and lifespan of the crankshaft connection components, and secondly, it affects the holding force of the rotor fitting. Therefore, by... The settings are within a reasonable range to balance the relationship between cost and motor output power performance while ensuring output power.

[0048] Furthermore, This further reduces the amount of permanent magnet 22 used, thereby lowering the cost of the motor. At the same time, by further optimizing the thickness of the permanent magnet 22 and the proportion of 2R1 in the maximum outer diameter of the rotor core 21, the relationship between motor cost and motor performance is further balanced. Secondly, it can also take into account the fitting relationship between the rotor shaft hole and the crankshaft of the pump body component, balancing the relationship between overall machine efficiency, cost and reliability.

[0049] Reference Figure 7 In one implementation method, Where L2 is the thickness of the permanent magnet 22, 2R1 is the maximum outer diameter of the rotor core 21, and L2 / 2R1 represents the proportion of the thickness of the permanent magnet 22 in the rotor core 21. This indicates that the thickness of the permanent magnet 22 accounts for a large proportion of the rotor core 21. Firstly, the permanent magnet 22 is mainly made of rare earth metal elements, which are costly, increasing its proportion in the rotor core 21 and thus increasing the cost of the motor. Secondly, the permanent magnet 22 is embedded in the rotor core and generates 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. Under high-speed conditions, the magnetic bridge of the rotor core is at risk of breakage, thus affecting the performance and lifespan of the motor. Furthermore, the maximum outer diameter 2R1 of the rotor core 21 decreases, leading to a decrease in the motor's output torque, which in turn affects the motor's output power. If L2 / 2R1 < 0.015, it indicates that the thickness of the permanent magnet 22 is relatively small, which leads to a decrease in the motor's demagnetization resistance and the amplitude of the demagnetization current, thus affecting the output power and reliability of the permanent magnet motor. In addition, insufficient thickness of the permanent magnet 22 may lead to a decrease in the amplitude of the air gap magnetic flux density of the motor, which in turn leads to a weakening of the maximum output torque capability. Therefore, by setting 0.015≤L2 / 2R1≤0.025 within a reasonable range, the relationship between cost and performance can be balanced while ensuring output power.

[0050] Furthermore, 0.018 ≤ L2 / 2R1 ≤ 0.023. This further reduces the amount of permanent magnet 22 used, thereby lowering the cost of the motor; at the same time, by further optimizing the thickness of the permanent magnet 22 and the proportion of 2R1 in the maximum outer diameter of the rotor core 21, the relationship between motor cost and motor performance is further balanced.

[0051] In one implementation, 10 ≤ P ≤ 12. Motors with a pole number P between 10 and 12 achieve a better balance between torque and speed. Compared to motors with fewer poles, motors with a pole number P between 10 and 12 have higher torque and lower speed, making them suitable for applications requiring high torque and low speed. Furthermore, compared to motors with more poles, motors with a pole number P between 10 and 12 avoid problems such as increased motor size and rotor inertia caused by excessive pole numbers, thus maintaining higher efficiency.

[0052] Specifically, the range is 14mm ≤ L1 ≤ 23mm. If L1 > 23mm, it indicates that the sum of the widths of the permanent magnets 22 corresponding to each magnetic pole is too large. Since the cost of permanent magnets 22 is relatively high, an excessively wide permanent magnet 22 will increase the cost of the motor. Secondly, increasing the width of the permanent magnets 22 may lead to uneven heat distribution inside the motor, increasing the difficulty of heat dissipation, and thus affecting the operating efficiency and stability of the motor. If L1 < 14mm, it indicates that the sum of the widths of the permanent magnets 22 corresponding to each magnetic pole is too small, resulting in lower output power of the motor. At the same time, an excessively small width of the permanent magnets 22 may make the motor more prone to fluctuations and instability when subjected to external interference during operation. Therefore, within the range of 14mm ≤ L1 ≤ 23mm, the magnetic field distribution is optimized, the output power of the motor is guaranteed, the amount of permanent magnets 22 used is reduced, and the manufacturing cost of the motor is lowered.

[0053] Specifically, the thickness of the permanent magnet 22 is 1.1mm ≤ L2 ≤ 1.8mm. If L2 > 1.8mm, it indicates that the thickness of the permanent magnet 22 is too large. Since the permanent magnet 22 is expensive, a thicker permanent magnet 22 will increase the cost of the motor. Secondly, increasing the thickness of the permanent magnet 22 may lead to uneven heat distribution inside the motor, increasing the difficulty of heat dissipation, and thus affecting the operating efficiency and stability of the motor. If L2 < 1.1mm, it indicates that the thickness of the permanent magnet 22 is too small, resulting in lower output power of the motor. At the same time, an excessively small thickness of the permanent magnet 22 may make the motor more prone to fluctuations and instability when subjected to external interference during operation. Therefore, within the range of 1.1mm ≤ L2 ≤ 1.8mm, the magnetic field distribution is optimized, the output power of the motor is guaranteed, the amount of permanent magnet 22 used is reduced, and the manufacturing cost of the motor is reduced.

[0054] Specifically, the range should be 23mm ≤ R1 ≤ 34mm. If R1 > 34mm, the rotor's outer diameter is too large. An increased rotor outer diameter leads to a greater moment of inertia in the motor. This means the motor needs to overcome greater inertial forces when changing its motion (such as starting, stopping, or changing speed), resulting in a slower response speed. Simultaneously, a larger rotor outer diameter usually reduces the magnetic flux density of the motor's core. This weakens the magnetic coupling between the core and the copper wire, but the increased core volume may also increase overall iron losses. If R1 < 23mm, the rotor's outer diameter is too small. A smaller outer diameter reduces the air gap area and magnetic flux, thus lowering the motor's output torque. Furthermore, a small rotor outer diameter may restrict airflow inside the motor, affecting heat dissipation and causing the temperature to rise and efficiency to decrease during operation. Therefore, maintaining a range of 23mm ≤ R1 ≤ 34mm optimizes the motor's torque output, reduces the core size, and ultimately improves efficiency.

[0055] Reference Figure 8 and Figure 9 Specifically, the rotor core 21 is provided with a shaft hole 212, the minimum radius of which is R2, 5mm≤R2≤8mm. Understandably, the larger the shaft hole 212, the larger the corresponding shaft, which indicates a greater torque required by the motor. With the thickness and width of the permanent magnet 22 and the rotor outer diameter remaining constant, if R2 > 8mm, and the shaft is made of a non-magnetic material (such as stainless steel) and the rotor magnetic flux density is relatively saturated, increasing the diameter of the shaft hole 212 will lead to further saturation of the rotor yoke magnetic flux density. This will increase the motor's excitation current, reduce the power factor, and may cause excessive current and burn out the motor. Simultaneously, magnetic flux density saturation will also increase the motor's core loss and copper loss, reducing the motor's efficiency. If R2 < 5mm, an excessively small shaft hole 212 may cause stress concentration. During motor operation, 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 edge of the hole, thereby increasing the risk of shaft breakage.

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

[0057] Furthermore, the number of stator slots 14 is Q, where 15 ≤ Q ≤ 18. It is understood that the number of stator slots 14 Q within this range provides a relatively balanced performance. It is neither too few to negatively impact motor efficiency and torque, nor too many to significantly increase manufacturing costs. Moreover, limiting the number of stator slots 14 Q to between 15 and 18 helps provide a more uniform magnetic field distribution, thereby reducing magnetic field non-uniformity and improving motor efficiency and performance. Secondly, limiting the number of stator slots 14 Q to between 15 and 18 makes the motor's magnetic field more uniform, reducing magnetic field fluctuations and thus lowering motor noise. It also helps reduce motor vibration. Compared to motors with a higher number of slots, motors with 15 to 18 slots may have a manufacturing cost advantage because they do not require as many winding coils and insulation materials, reducing manufacturing difficulty and cost. Limiting the number of stator slots 14 Q to between 15 and 18 can improve motor efficiency and torque density. Although increasing the number of stator slots Q by 14 can further improve these performance parameters, relatively high efficiency and torque can already be achieved in the range of 15 to 18.

[0058] Specifically, the number of stator slots 14 is Q, and the number of phases of the permanent magnet motor is m, where 0 < Q / mP < 1. The number of slots per pole per phase is equal to the ratio of the number of stator slots 14 to the product of the number of rotor pole pairs and the number of motor phases, ensuring that the number of slots per pole per phase is 0 < Q / mP < 1. This allows the motor to form a fractional-slot motor, which effectively reduces the cogging torque induced by the rotor's permanent magnet magnetic field. Furthermore, the fractional-slot motor effectively increases the equivalent number of slots per pole per phase. This means that with the same number of slots, the fractional-slot motor achieves better distribution performance, making the motor waveform closer to a sine wave. This helps improve the motor's efficiency and performance. Secondly, the fractional-slot motor effectively reduces the magnetic flux pulsation per pole caused by changes in air gap permeability, thereby reducing the pulsation amplitude. This helps improve the electromotive force waveform and reduce pulsation losses, improving the motor's operating efficiency and stability. Because fractional-slot motors achieve the same distributed performance as integer-slot windings with a large number of slots using fewer slots, they have a relatively smaller number of slots and better manufacturability. This helps reduce manufacturing costs and improve production efficiency. Furthermore, fractional-slot motors typically have better torque characteristics and lower torque ripple. This is because fractional-slot motors can optimize the magnetic field distribution and reduce harmonic components, thereby reducing torque ripple. This makes fractional-slot motors advantageous in applications requiring high-precision control and stable operation.

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

[0060] This invention also proposes a refrigeration device, which includes a compressor. The specific structure of the compressor is as described in the above embodiments. Refrigeration devices can be classified into compression refrigeration devices, absorption refrigeration devices, vapor jet refrigeration devices, heat pump refrigeration devices, and electric heating refrigeration devices, etc. Refrigeration devices mainly consist of a compressor, expansion valve, evaporator, condenser, accessories, and piping. Examples include refrigerators and air conditioners. Since the compressor in this invention adopts all the technical solutions of all the above embodiments, it possesses at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be elaborated further here.

[0061] The above description is merely an exemplary embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural transformations made using the contents of the present invention specification and drawings under the technical concept of the present invention, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. A permanent magnet motor, characterized in that, include: stator; and The rotor includes a rotor core and permanent magnets. The rotor core has magnet slots, and the permanent magnets are located within these slots. The maximum outer radius of the rotor core is R1, the sum of the widths of the permanent magnets corresponding to each magnetic pole is L1, the thickness of the permanent magnets is L2, and the number of magnetic poles of the rotor is P.

2. The permanent magnet motor as described in claim 1, characterized in that, 3. The permanent magnet motor as described in 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 as described in claim 3, characterized in that, 5. The permanent magnet motor as described in claim 1, characterized in that, 6. The permanent magnet motor as described in claim 5, characterized in that, 7. The permanent magnet motor as described in claim 1, characterized in that, 10≤P≤12。 8. The permanent magnet motor as described in claim 1, characterized in that, 14mm≤L1≤23mm.

9. The permanent magnet motor as described in claim 1, characterized in that, 1.1mm≤L2≤1.8mm.

10. The permanent magnet motor as described in claim 1, characterized in that, 23mm≤R1≤34mm.

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

12. The permanent magnet motor as described in claim 1, characterized in that, The stator includes a stator yoke, a plurality of stator teeth and a plurality of toothed shoes. The plurality of stator teeth are spaced apart on the inner circumferential surface of the stator yoke. The toothed shoes are connected to the end of the stator teeth away from the stator yoke. One stator tooth corresponds to one toothed shoe. The stator teeth and the stator yoke enclose each other to form a stator groove.

13. The permanent magnet motor as described in claim 12, characterized in that, The number of stator slots is Q, where 15 ≤ Q ≤ 18.

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

15. A compressor, characterized in that, Includes the permanent magnet motor as described in any one of claims 1 to 14.

16. A refrigeration device, characterized in that, Includes the compressor as described in claim 15.

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