Motor, compressor and refrigeration equipment

Abstract

The utility model discloses a motor, compressor and refrigeration equipment, relates to refrigeration equipment technical field, the motor comprises a stator and a rotor, the rotor comprises a permanent magnet and a rotor core, the permanent magnet comprises a first permanent magnet and a second permanent magnet, the rotor core comprises a plurality of laminated rotor punching sheets, the rotor punching sheets are provided with a rotating shaft hole, and the rotating shaft hole is provided with a rotating shaft. The rotor punching sheet is provided with a plurality of first magnet grooves and a plurality of second magnet grooves, the first magnet grooves and the second magnet grooves are arranged at intervals, the first magnet grooves extend in the radial direction of the rotor punching sheet, and the second magnet grooves are distributed around the periphery of the rotating shaft hole at intervals. The first permanent magnets and the second permanent magnets are located in the first magnet grooves and the second magnet grooves respectively, the first permanent magnets are at least partially located between the two adjacent second permanent magnets, the number of pole pairs of the rotor is P, the total number of the permanent magnets is 2P, and 2P is larger than or equal to 12 and smaller than or equal to 20. According to the technical scheme provided by the utility model, the eddy-current loss in the permanent magnet is reduced, and the motor efficiency is improved.

Description

Technical Field

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

[0002] With the rapid development of the economic level and the improvement of the people's living standards, the people's demand for high efficiency and low noise is increasing day by day. Therefore, it is necessary to reasonably optimize the air-conditioning compressor motor to effectively reduce the loss and improve the efficiency. Summary of the Utility Model

[0003] The main object of the utility model is to provide an electric motor, a compressor and a refrigeration equipment, aiming at reducing the eddy current loss in the permanent magnet and improving the efficiency of the electric motor.

[0004] To achieve the above object, the electric motor provided by the utility model includes:

[0005] A stator; and

[0006] A rotor, the rotor includes a permanent magnet and a rotor core, the permanent magnet includes a first permanent magnet and a second permanent magnet, the rotor core includes a plurality of stacked rotor punching sheets, a shaft hole is provided on the rotor punching sheet, a plurality of first magnet slots and a plurality of second magnet slots are provided on the rotor punching sheet, the first magnet slots and the second magnet slots are arranged at intervals, the first magnet slots extend along the radial direction of the rotor punching sheet, a plurality of the second magnet slots are distributed at intervals around the outer circumference of the shaft hole, the first permanent magnet and the second permanent magnet are respectively located in the first magnet slot and the second magnet slot, and at least a part of the first permanent magnet is located between two adjacent second permanent magnets, the number of pole pairs of the rotor is P, the total number of the permanent magnets is 2P, and 12≤2P≤20.

[0007] In an embodiment, the thickness of the first permanent magnet is D 1 , the thickness of the second permanent magnet is D 2 , D 1 >D 2 .

[0008] In an embodiment, the width of the first permanent magnet is W 1 , the width of the second permanent magnet is W 2 , 0.735≤W 1 / W 2 ≤1.265.

[0009] In an embodiment, the included angle between the extension line in the width direction of the first permanent magnet and the perpendicular bisector in the width direction of the second permanent magnet is θ, and 28°≤θ≤32°.

[0010] In an embodiment, the included angle between the extension line in the width direction of the first permanent magnet and the perpendicular bisector in the width direction of the second permanent magnet is θ, and the shortest distance between the midpoint on the outer side of the second permanent magnet and the outer peripheral surface of the rotor is s, 0.1 ≤ (π / P / θ)W 2 / s ≤ 0.2.

[0011] In an embodiment, the stator includes a stator yoke and stator teeth. The stator teeth are located inside the stator yoke, and a plurality of the stator teeth are arranged at intervals in the circumferential direction of the stator yoke. The rotor core is arranged inside the plurality of stator teeth.

[0012] In an embodiment, the minimum inner diameter of the stator teeth is R 1 , and the maximum outer diameter of the stator yoke is R 2 , 20 ≤ 3P / (R 1 / R 2 ) ≤ 35.842.

[0013] In an embodiment, the number of the stator teeth is Z; Z / P = 3.

[0014] In an embodiment, the number of the stator teeth is Z, the stator further includes a stator winding, the stator winding is wound around the stator teeth, the effective value of the line-to-line back electromotive force of the stator winding is U, the rotational speed of the motor is n, and the maximum outer diameter of the stator yoke is R 2 , ke = U / n, 0.213 ≤ (ke / R 2 / Z) × P ≤ 0.352.

[0015] In an embodiment, when Z = 9, 0.638 ≤ ke / R 2 ≤ 0.933.

[0016] In an embodiment, when Z = 12, 0.679 ≤ ke / R 2 ≤ 1.056.

[0017] In an embodiment, a plurality of air grooves are provided on the rotor core. The air grooves are arranged in a T shape, and the width of the air grooves gradually increases along the direction close to the axis of the rotor core.

[0018] In an embodiment, the air grooves are located at one end of the first permanent magnet facing outward, and the air grooves are arranged at intervals from the first magnet groove.

[0019] In an embodiment, a plurality of guiding grooves are provided on the rotor core.

[0020] In one embodiment, the outer peripheral wall of the rotor core includes a plurality of arc segments; or the outer peripheral wall of the rotor core includes at least one arc segment and at least one straight segment.

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

[0022] The present utility model also provides a refrigeration device, including the compressor as described above.

[0023] The motor in the technical solution of the present utility model includes a stator and a rotor. The rotor includes a permanent magnet and a rotor core. The permanent magnet includes a first permanent magnet and a second permanent magnet. The rotor core includes a plurality of stacked rotor punching sheets. The rotor punching sheets are provided with a shaft hole. The rotor punching sheets are provided with a plurality of first magnet slots and a plurality of second magnet slots. The first magnet slots and the second magnet slots are arranged at intervals. The first magnet slots extend along the radial direction of the rotor punching sheet. The plurality of second magnet slots are spaced around the outer periphery of the shaft hole. The first permanent magnet and the second permanent magnet are respectively located in the first magnet slots and the second magnet slots, and at least part of the first permanent magnet is located between two adjacent second permanent magnets. By reasonably arranging the first magnet slots and the second magnet slots, the magnetic field distribution is optimized, the magnetic field is made more uniform, the magnetic leakage phenomenon is reduced, and thus the efficiency and performance of the motor are improved; further, the number of pole pairs of the rotor is P, and the total number of permanent magnets is 2P, 12≤2P≤20, so as to reasonably limit the number of permanent magnets, and further improve the magnetic field strength of the rotor. The technical solution of the present utility model optimizes the layout and arrangement of the permanent magnets, thereby increasing the magnetic flux density in the air gap, enhancing the magnetic energy utilization rate and performance of the motor, further improving the magnetic focusing effect of the motor, reducing the eddy current loss in the permanent magnets, and further improving the motor efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model 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 utility model. For those of ordinary skill in the art, other drawings can be obtained based on the structures shown in these drawings without creative efforts.

[0025] Figure 1 It is a schematic structural diagram of the stator in an embodiment of the motor provided by the present utility model;

[0026] Figure 2 It is a schematic structural diagram of the rotor in an embodiment of the motor provided by the present utility model;

[0027] Figure 3 It is a schematic structural diagram of an embodiment of the compressor provided by the present utility model;

[0028] Figure 4 The figure for comparing the eddy current loss and core loss between the motor provided by the present utility model and the existing motor;

[0029] Figure 5 The figure for comparing the efficiency between the motor provided by the present utility model and the existing motor.

[0030] Explanation of the reference numerals in the drawings:

[0031] 1. Motor; 11. Stator yoke; 12. Stator teeth; 13. Rotor core; 131. First magnet slot; 132. Second magnet slot; 133. Shaft hole; 135. Air slot; 136. Guide slot; 141. First permanent magnet; 142. Second permanent magnet.

[0032] The realization, functional features and advantages of the object of the present utility model will be further described with reference to the embodiments and the accompanying drawings. Detailed implementation manners

[0033] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described with reference to 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. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0034] It should be noted that if there are directional indications (such as up, down, left, right, front, back...) involved 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.

[0035] In addition, if there are descriptions such as "first" and "second" in the embodiments of the present utility model, the descriptions of "first" and "second" 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 such feature. 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, or solution B, or the solution where A and B are satisfied simultaneously. In addition, the technical solutions between various 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 is contradictory 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.

[0036] Refer to Figure 1 andFigure 2 , the present utility model provides a motor 1, comprising:

[0037] a stator; and

[0038] a rotor, the rotor comprising a permanent magnet and a rotor core 13, the permanent magnet comprising a first permanent magnet 141 and a second permanent magnet 142, the rotor core 13 comprising a plurality of stacked rotor punching sheets, the rotor punching sheets being provided with a shaft hole 133, the rotor punching sheets being provided with a plurality of first magnet slots 131 and a plurality of second magnet slots 132, the first magnet slots 131 and the second magnet slots 132 being arranged at intervals, the first magnet slots 131 extending along the radial direction of the rotor punching sheets, a plurality of the second magnet slots 132 being spaced apart around the outer periphery of the shaft hole 133, the first permanent magnet 141 and the second permanent magnet 142 being respectively located in the first magnet slots 131 and the second magnet slots 132, and at least a part of the first permanent magnet 141 being located between two adjacent second permanent magnets 142, the number of pole pairs of the rotor being P, the total number of permanent magnets being 2P, 12 ≤ 2P ≤ 20.

[0039] The motor 1 in the technical solution of the present utility model comprises a stator and a rotor, the rotor comprising a permanent magnet and a rotor core 13, the permanent magnet comprising a first permanent magnet 141 and a second permanent magnet 142, the rotor core 13 comprising a plurality of stacked rotor punching sheets, the rotor punching sheets being provided with a shaft hole 133, the rotor punching sheets being provided with a plurality of first magnet slots 131 and a plurality of second magnet slots 132, the first magnet slots 131 and the second magnet slots 132 being arranged at intervals, the first magnet slots 131 extending along the radial direction of the rotor punching sheets, a plurality of the second magnet slots 132 being spaced apart around the outer periphery of the shaft hole 133, the first permanent magnet 141 and the second permanent magnet 142 being respectively located in the first magnet slots 131 and the second magnet slots 132, and at least a part of the first permanent magnet 141 being located between two adjacent second permanent magnets 142. By reasonably arranging the first magnet slots 131 and the second magnet slots 132, the magnetic field distribution is optimized, the magnetic field is made more uniform, the magnetic leakage phenomenon is reduced, and thus the efficiency and performance of the motor 1 are improved; further, the number of pole pairs of the rotor is P, the total number of permanent magnets is 2P, 12 ≤ 2P ≤ 20, so that the number of permanent magnets is reasonably limited, and thus the magnetic field strength of the rotor is improved. The technical solution of the present utility model optimizes the layout and arrangement of the permanent magnets, thereby increasing the magnetic flux density in the air gap, enhancing the magnetic energy utilization rate and performance of the motor 1, further improving the magnetic focusing effect of the motor 1, reducing the eddy current loss in the permanent magnets, and further improving the efficiency of the motor 1.

[0040] In one embodiment, the thickness of the first permanent magnet 141 is D 1 , the thickness of the second permanent magnet 142 is D 2 , D1 > D 2 Understandably, by reasonably setting the thicknesses of the first permanent magnet 141, the second permanent magnet 142, and the third permanent magnet, the magnetic flux path of the rotor is optimized, magnetic leakage is reduced, the air-gap magnetic density of the motor 1 is increased, and thus the output performance of the motor 1 is improved.

[0041] In one embodiment, the width of the first permanent magnet 141 is W 1 , the width of the second permanent magnet 142 is W 2 , 0.735 ≤ W 1 / W 2 ≤ 1.265. Wherein, W 1 / W 2 represents the width ratio between the first permanent magnet 141 and the second permanent magnet 142. The first permanent magnet 141 and the third permanent magnet are located on both sides of the second permanent magnet 142, that is, W 1 / W 2 represents the magnetic field distribution on the rotor. Therefore, by setting 0.735 ≤ W 1 / W 2 ≤ 1.265, the magnetic field distribution on the rotor is reasonably set, thereby increasing the torque density, reducing the reluctance loss, and improving the heat dissipation performance.

[0042] In one embodiment, the included angle θ between the extension line in the width direction of the first permanent magnet 141 and the perpendicular bisector in the width direction of the second permanent magnet 142 is 28° ≤ θ ≤ 32°.

[0043] In one embodiment, the included angle θ between the extension line in the width direction of the first permanent magnet 141 and the perpendicular bisector in the width direction of the second permanent magnet 142, and the shortest distance s between the midpoint on the outer side of the second permanent magnet 142 and the outer peripheral surface of the rotor satisfy 0.1 ≤ (π / P / θ)W 2 / s ≤ 0.2. Wherein, s represents the shortest distance from the midpoint on the outer side of the rotor to the outer edge of the rotor, and (π / P / θ)W 2 / s represents the permanent magnet usage under different pole numbers. If (π / P / θ)W 2 / s > 0.2, it indicates that the permanent magnet density on the rotor is too high at this time; when the permanent magnet density is too high, magnetic saturation may occur in some parts of the magnetic circuit, and magnetic saturation will limit the performance improvement of the motor 1; at the same time, the permanent magnet will generate a certain amount of heat during operation. If the permanent magnet density is too high, the heat inside the motor 1 will be more concentrated, thus increasing the difficulty of heat dissipation. If (π / P / θ)W 2If s < 0.1, it indicates that the density of the permanent magnets on the rotor is too small at this time, resulting in insufficient magnetic field strength generated by the motor 1, and further resulting in a low output power of the motor 1, which cannot meet the needs of customers.

[0044] In one embodiment, the stator includes a stator yoke 11 and stator teeth 12. The stator teeth 12 are located inside the stator yoke 11, and a plurality of the stator teeth 12 are arranged at intervals along the circumferential direction of the stator yoke 11. The rotor core 13 is disposed within the plurality of stator teeth 12. That is, the rotor is disposed inside the stator, and the motor 1 is an inner-rotor motor 1.

[0045] In one embodiment, the minimum inner diameter of the stator teeth 12 is R 1 , and the maximum outer diameter of the stator yoke 11 is R 2 , 20 ≤ 3P / (R 1 / R 2 ) ≤ 35.842. Since the technical solution in this application is an inner-rotor motor 1, therefore, R 1 also represents the space in the stator for installing the rotor, and 3P / (R 1 / R 2 ) represents the number of permanent magnets in this installation space. If 3P / (R 1 / R 2 ) > 35.842, it indicates that the density of the permanent magnets on the rotor is too large at this time; when the density of the permanent magnets is too large, it may cause magnetic saturation in some parts of the magnetic circuit, and magnetic saturation will limit the improvement of the performance of the motor 1; at the same time, the permanent magnets will generate a certain amount of heat during operation. If the density of the permanent magnets is too large, it will make the heat inside the motor 1 more concentrated, thus increasing the difficulty of heat dissipation. If 3P / (R 1 / R 2 ) < 20, it indicates that the density of the permanent magnets on the rotor is too small at this time, resulting in insufficient magnetic field strength generated by the motor 1, and further resulting in a low output power of the motor 1, which cannot meet the needs of customers.

[0046] In one embodiment, the number of the stator teeth 12 is Z; Z / P = 3. When Z / P = 3, the interaction between the stator and rotor magnetic fields reaches the best state at this time, thereby improving the torque output and efficiency of the motor 1; at the same time, the reasonable magnetic field distribution also makes the mechanical stress inside the motor 1 evenly distributed, thereby reducing the generation of vibration and noise.

[0047] In another embodiment, the number of the stator teeth 12 is Z, the stator further includes a stator winding, the stator winding is wound around the stator teeth 12, the effective value of the line-to-line back electromotive force of the stator winding is U, the rotational speed of the motor 1 is n, and the maximum outer diameter of the stator yoke 11 is R 2 , ke = U / n, 0.213 ≤ (ke / R2 (ke / R / Z)×P ≤ 0.352. (ke / R 2 (ke / R / Z)×P represents the value range of the ke value under different rotor pole numbers; when 0.213 ≤ (ke / R 2 (ke / R / Z)×P ≤ 0.352, the energy efficiency at the system end of the motor 1 can be improved. When (ke / R 2 (ke / R / Z)×P < 0.213 or (ke / R 2 (ke / R / Z)×P > 0.352, the energy efficiency at the system end of the motor 1 is relatively low at this time, which will further reduce the efficiency of the motor 1.

[0048] Further, in an embodiment, when Z = 9, 0.638 ≤ ke / R 2 ≤ 0.933, ke / R 2 represents the value range of ke under different stator outer diameters. By further optimizing the range of the ke value, the energy efficiency at the system end of the motor 1 is further improved.

[0049] Further, in an embodiment, when Z = 12, 0.679 ≤ ke / R 2 ≤ 1.056, ke / R 2 represents the value range of ke under different stator outer diameters. By further optimizing the range of the ke value, the energy efficiency at the system end of the motor 1 is further improved.

[0050] In an embodiment, a plurality of air grooves 135 are provided on the rotor core 13. The air grooves 135 are arranged in a T shape, and the width of the air grooves 135 gradually increases in the direction close to the axis of the rotor core 13. The T-shaped air grooves 135 can improve the magnetic field uniformity in the dense magnetic field area of the rotor, prevent the magnetic field intensity from being too high at local positions, thereby optimizing the magnetic circuit of the motor 1, making the distribution of magnetic force lines more reasonable, and thus improving the operating efficiency and stability of the motor 1. Further, opening axial air grooves 135 on the surface of the solid rotor can increase the effective area of the rotor surface, thereby reducing the rotor resistance and further improving the pull-in synchronization ability of the motor 1.

[0051] In an embodiment, the air groove 135 is located at the outer end of the first permanent magnet 141, and the air groove 135 is arranged at intervals with the first magnet groove 131. By reasonably setting the position of the air groove 135, the distribution of magnetic force lines can be more effectively guided, making the magnetic field on the rotor core 13 more uniform. This helps to reduce energy loss and electromagnetic noise caused by uneven magnetic field distribution.

[0052] In one embodiment, a plurality of guiding grooves 136 are provided on the rotor core 13. The design of the guiding grooves 136 helps to guide the path of magnetic lines of force in the core, thereby optimizing the magnetic field distribution, reducing magnetic leakage and magnetic resistance, improving the utilization efficiency of the magnetic field, and further enhancing the performance and efficiency of the motor 1.

[0053] In one embodiment, the outer peripheral wall of the rotor core 13 includes a plurality of arc segments; or the outer peripheral wall of the rotor core 13 includes at least one arc segment and at least one straight segment. By changing the geometric shape of the rotor outer peripheral wall, such as adopting a multi-pole arc or eccentric arc design or a straight segment design, etc., the distribution of the air-gap magnetic flux density can be optimized, making the waveform approach a sine wave, reducing the harmonic content, thereby reducing torque ripple and improving the running smoothness of the motor 1.

[0054] Refer to Figure 4 and Figure 5 , Figure 4 is a broken line graph of the eddy current loss and core loss of the motor 1 in the technical solution of the present invention and the motor 1 in the prior art; Figure 5 is a broken line graph of the efficiency of the motor 1 in the technical solution of the present invention and the motor 1 in the prior art. As can be seen from Figure 4 and Figure 5 , the eddy current loss and core loss of the motor 1 in this embodiment are significantly lower than those of the motor 1 in the prior art; at the same time, the efficiency of the motor 1 in this embodiment is significantly higher than that of the motor 1 in the prior art.

[0055] Refer to Figure 3 , the present invention also proposes a compressor, which includes a motor. The specific structure of the motor refers to the above-mentioned embodiment. Since the compressor in this solution adopts all the technical solutions of the above-mentioned all embodiments, it has at least all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, and will not be elaborated here one by one.

[0056] The present invention also proposes a refrigeration device, which includes a compressor. The specific structure of the compressor refers to the above-mentioned embodiment. Since the compressor in this solution adopts all the technical solutions of the above-mentioned all embodiments, it has at least all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, and will not be elaborated here one by one.

[0057] The above 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 in other related technical fields, is included in the patent protection scope of the present invention.

Claims

1. A motor, characterized in that: include: stator; and A rotor, the rotor comprising a permanent magnet and a rotor core, the permanent magnet comprising a first permanent magnet and a second permanent magnet, the rotor core comprising a plurality of stacked rotor punchings, the rotor punchings being provided with a shaft hole, the rotor punchings being provided with a plurality of first magnet slots and a plurality of second magnet slots, the first magnet slots and the second magnet slots being arranged at intervals, the first magnet slots extending along the radial direction of the rotor punchings, a plurality of second magnet slots being distributed at intervals around the outer circumference of the shaft hole, the first permanent magnet and the second permanent magnet being respectively located in the first magnet slot and the second magnet slot, and the first permanent magnet being at least partially located between two adjacent second permanent magnets, the number of pole pairs of the rotor being P, the total number of the permanent magnets being 2P, 12≤2P≤20.

2. The motor according to claim 1, characterized in that The thickness of the first permanent magnet is D1, the thickness of the second permanent magnet is D2, and D1>D2.

3. The motor according to claim 1, characterized in that The width of the first permanent magnet is W1, the width of the second permanent magnet is W2, and 0.735≤W1 / W2≤1.

265.

4. The motor according to claim 1, characterized in that The angle between the extension line of the first permanent magnet in the width direction and the perpendicular bisector of the second permanent magnet in the width direction is θ, and 28°≤θ≤32°.

5. The motor according to claim 1, characterized in that The width of the second permanent magnet is W2, the angle between the extension line of the first permanent magnet in the width direction and the perpendicular bisector of the second permanent magnet in the width direction is θ, the shortest distance between the midpoint of the outward side of the second permanent magnet and the outer peripheral surface of the rotor is s, 0.1≤(π / P / θ)W2 / s≤0.

2.

6. The motor according to claim 1, characterized in that The stator includes a stator yoke and stator teeth. The stator teeth are located inside the stator yoke, and a plurality of the stator teeth are arranged at intervals along the circumferential direction of the stator yoke. The rotor core is arranged inside the plurality of the stator teeth.

7. The motor according to claim 6, characterized in that The minimum inner diameter of the stator teeth is R1, the maximum outer diameter of the stator yoke is R2, and 20≤3P / (R1 / R2)≤35.

842.

8. The motor according to claim 6, characterized in that The number of stator teeth is Z, and Z / P=3.

9. The motor according to claim 6, characterized in that The number of stator teeth is Z, and the stator also includes a stator winding, which is wound around the stator teeth. The effective value of the line-to-line back electromotive force of the stator winding is U, the rotation speed of the motor is n, and the maximum outer diameter of the stator yoke is R2, ke=U / n, 0.213≤(ke / R2 / Z)×P≤0.

352.

10. The motor according to claim 9, characterized in that When Z=9, 0.638≤ke / R2≤0.

933.

11. The motor according to claim 9, characterized in that When Z=12, 0.679≤ke / R2≤1.

056.

12. The motor according to claim 1, characterized in that The rotor core is provided with a plurality of air slots, the air slots are arranged in a T-shape, and the width of the air slots is gradually increased along the direction close to the axis of the rotor core.

13. The motor according to claim 12, characterized in that The air slot is located at an outward end of the first permanent magnet, and the air slot is spaced apart from the first magnet slot.

14. The motor according to claim 1, characterized in that The rotor core is provided with a plurality of guide grooves.

15. The motor according to claim 1, characterized in that The outer peripheral wall of the rotor core includes a plurality of arc segments; or The outer peripheral wall of the rotor core includes at least one arc segment and at least one straight segment.

16. A compressor, characterized in that: Comprising a motor as claimed in any one of claims 1 to 15.

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

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