Rotor, motor, compressor and refrigeration equipment

Abstract

The present invention discloses a rotor, a motor, a compressor and a refrigeration device, relating to the technical field of refrigeration devices. Among them, the rotor includes a rotor core and permanent magnets. A plurality of permanent magnet slots are arranged at intervals on the rotor core. The intersections of the symmetry line of the permanent magnet slot and the slot wall of the permanent magnet slot are defined as a first intersection and a second intersection. The first intersection is located on the side of the second intersection close to the outer peripheral wall of the rotor core; each group of the permanent magnets includes a first permanent magnet and a second permanent magnet. One permanent magnet slot corresponds to one group of the permanent magnets. The number of pole pairs of the permanent magnets is P. The width of the first permanent magnet and / or the second permanent magnet is W. The shortest distance between the first intersection and the first permanent magnet or the second permanent magnet is L1. The length of the first permanent magnet and / or the second permanent magnet is L2, #imgabs0# mm ≤ L1 ≤ 0.15L2, and L1 ≤ W. The technical solution provided by the present invention improves the anti-demagnetization performance of the rotor.

Description

Technical Field

[0001] The present invention relates to the technical field of refrigeration equipment, and particularly to a rotor, a motor, a compressor, and a refrigeration equipment. Background Art

[0002] At present, rare earth permanent magnet motors have the advantages of simple and reliable structure, high efficiency, and large power density, and are widely used. However, rare earth permanent magnets have the risk of demagnetization under high-temperature working conditions. Increasing the thickness of rare earth permanent magnets in the magnetization direction can improve the demagnetization resistance to a certain extent, but the improvement of motor performance is very limited, and the cost performance of the motor will be reduced. How to improve the demagnetization resistance by optimizing the structure of the motor rotor without increasing the thickness of rare earth permanent magnets is very important for improving the cost performance of the motor. Summary of the Invention

[0003] The main object of the present invention is to propose a rotor, a motor, a compressor, and a refrigeration equipment, aiming to improve the demagnetization resistance of the rotor.

[0004] To achieve the above object, the rotor proposed by the present invention includes:

[0005] A rotor core, on which a plurality of permanent magnet slots are provided at intervals. Define the intersection points of the symmetry line of the permanent magnet slot and the slot wall of the permanent magnet slot as the first intersection point and the second intersection point, and the first intersection point is located on the side of the second intersection point close to the outer peripheral wall of the rotor core;

[0006] Multiple groups of permanent magnets, each group of permanent magnets includes a first permanent magnet and a second permanent magnet, one permanent magnet slot corresponds to one group of permanent magnets, the number of pole pairs of the permanent magnets is P, the width of the first permanent magnet and / or the second permanent magnet is W, the shortest distance between the first intersection point and the first permanent magnet or the second permanent magnet is L1, and the length of the first permanent magnet and / or the second permanent magnet is L2. 0.01mm ≤ L1 ≤ 0.15L2, L1 ≤ W, and the units of L1, L2, and W are all mm.

[0007] In an embodiment, the permanent magnet slot is arranged in a V shape.

[0008] In an embodiment, the included angle between the first permanent magnet and the second permanent magnet in the same permanent magnet slot is α, and 100° ≤ α ≤ 150°.

[0009] In an embodiment, the distance between the first intersection point and the second intersection point is L3, 0.5W < L3 < W + 0.2mm, and the unit of L3 is mm.

[0010] In an embodiment, 2 ≤ P ≤ 5.

[0011] In one embodiment, a plurality of current-carrying holes are provided on the rotor core.

[0012] In one embodiment, a shaft hole is provided on the rotor core.

[0013] The present invention also provides a motor, including the rotor as described above.

[0014] The present invention also provides a compressor, including the motor as described above.

[0015] The present invention also provides a refrigeration device, including the compressor as described above.

[0016] The rotor in the technical solution of the present invention includes a rotor core and multiple groups of permanent magnets. A plurality of permanent magnet slots are provided on the rotor core at intervals. Define the intersection points of the symmetry line of the permanent magnet slot and the slot wall of the permanent magnet slot as the first intersection point and the second intersection point. The first intersection point is located on the side of the second intersection point close to the outer peripheral wall of the rotor core. Each group of permanent magnets includes a first permanent magnet and a second permanent magnet. One permanent magnet slot corresponds to one group of permanent magnets. The number of pole pairs of the permanent magnet is P, the width of the first permanent magnet and / or the second permanent magnet is W, the shortest distance between the first intersection point and the first permanent magnet or the second permanent magnet is L1, and the length of the first permanent magnet and / or the second permanent magnet is L2. mm ≤ L1 ≤ 0.15L2, L1 ≤ W. Wherein, by reasonably setting the relevant dimensions of L1, L2 and W, the end of the first permanent magnet and / or the second permanent magnet facing the first intersection point is further away from the symmetry line of the permanent magnet slot, thereby alleviating the influence of the demagnetizing magnetic field generated by the motor current on the permanent magnet, and further enhancing the demagnetization resistance performance of the rotor. At the same time, compared with the prior art solution of increasing the thickness of the permanent magnet, the technical solution of the present invention adjusts the positional relationship between the permanent magnet slot and the permanent magnet, thereby reducing the amount of permanent magnet used compared with the prior art solution, and further reducing the production and manufacturing cost of the rotor, and further improving the cost performance of the rotor. Wherein, if L1 ≤ mm, it means that the end of the first permanent magnet and / or the second permanent magnet facing the first intersection point is too close to the symmetry line of the permanent magnet slot, resulting in a large influence of the demagnetizing magnetic field generated by the motor current on the permanent magnet, and further reducing the demagnetization resistance ability of the rotor. If L1 > 0.15L2 and / or L1 > W, it indicates that the distance between the first permanent magnet and the second permanent magnet and the first intersection point is too far, resulting in a large gap around the symmetry line of the permanent magnet slot, indicating that the proportion of the permanent magnet in the rotor core will be relatively reduced, resulting in a decrease in the utilization rate of the permanent magnet; this means that in order to obtain the same magnetic flux, more permanent magnet materials may need to be used, thus increasing the cost. At the same time, the increase of L1 may cause the magnetic circuit between the permanent magnets to become discontinuous, increasing the possibility of magnetic leakage. Description of the Drawings

[0017] 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 use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on the structures shown in these drawings.

[0018] Figure 1 It is a schematic structural diagram of an embodiment of the rotor provided by the present invention;

[0019] Figure 2 It is a schematic structural diagram of another embodiment of the rotor provided by the present invention;

[0020] Figure 3 It is a schematic structural diagram of an embodiment of the motor provided by the present invention;

[0021] Figure 4 It is a schematic structural diagram of an embodiment of the refrigeration equipment provided by the present invention;

[0022] Figure 5 It is the demagnetization rate of L1 of the rotor in the present invention under different values.

[0023] Explanation of the reference numerals in the drawings:

[0024] 1. Motor; 11. Rotor core; 111. Permanent magnet slot; 112. Current-carrying hole; 113. Shaft hole; 12. Permanent magnet; 121. First permanent magnet; 122. Second permanent magnet; 20. Stator; A. First intersection point; B. Second intersection point.

[0025] The realization of the object, functional features and advantages of the present invention will be further described in conjunction with the embodiments with reference to the drawings. Specific embodiments

[0026] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, rather than all embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts fall within the scope of protection of the present invention.

[0027] 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 invention, 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.

[0028] In addition, if the embodiments of the present invention involve descriptions such as "first" and "second", the descriptions of "first", "second", etc. are only for descriptive purposes and should not be construed as indicating or implying their relative importance or implicitly specifying 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 scenarios. Taking "A and / or B" as an example, it includes scenario A, or scenario B, or the scenario where both 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 what can be achieved by those of ordinary skill in the art. When the combination of technical solutions results in contradictions or cannot be achieved, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0029] Referring to Figure 1 、 Figure 2 and Figure 5 , the present invention provides a rotor, comprising:

[0030] A rotor core 11, on which a plurality of permanent magnet slots 111 are arranged at intervals. Define the intersection points of the symmetry line of the permanent magnet slot 111 and the slot wall of the permanent magnet slot 111 as a first intersection point A and a second intersection point B. The first intersection point A is located on the side of the second intersection point B closer to the outer peripheral wall of the rotor core 11;

[0031] Multiple groups of permanent magnets 12, each group of the permanent magnets 12 includes a first permanent magnet 121 and a second permanent magnet 122. One permanent magnet slot 111 corresponds to one group of the permanent magnets 12. The number of pole pairs of the permanent magnets 12 is P. The width of the first permanent magnet 121 and / or the second permanent magnet 122 is W. The shortest distance between the first intersection point A and the first permanent magnet 121 or the second permanent magnet 122 is L1. The length of the first permanent magnet 121 and / or the second permanent magnet 122 is L2. mm ≤ L1 ≤ 0.15L2, L1 ≤ W.

[0032] The rotor in the technical solution of the present invention includes a rotor core 11 and multiple groups of permanent magnets 12. Multiple permanent magnet slots 111 are arranged at intervals on the rotor core 11. Define the intersection points of the symmetry line of the permanent magnet slot 111 and the slot wall of the permanent magnet slot 111 as the first intersection point A and the second intersection point B. The first intersection point A is located on the side of the second intersection point B closer to the outer peripheral wall of the rotor core 11. Each group of permanent magnets 12 includes a first permanent magnet 121 and a second permanent magnet 122. One permanent magnet slot 111 corresponds to one group of permanent magnets 12. The pole pair number of the permanent magnets 12 is P. The width of the first permanent magnet 121 and / or the second permanent magnet 122 is W. The shortest distance between the first intersection point A and the first permanent magnet 121 or the second permanent magnet 122 is L1. The length of the first permanent magnet 121 and / or the second permanent magnet 122 is L2. mm ≤ L1 ≤ 0.15L2, L1 ≤ W. Among them, by reasonably setting the relevant dimensions of L1, L2, and W, the end of the first permanent magnet 121 and / or the second permanent magnet 122 facing the first intersection point A is further away from the symmetry line of the permanent magnet slot 111, thereby alleviating the influence of the demagnetizing magnetic field generated by the current of the motor 1 on the permanent magnet 12, and further enhancing the demagnetization resistance performance of the rotor. At the same time, compared with the prior art solution of increasing the thickness of the permanent magnet 12, the technical solution of the present invention adjusts the positional relationship between the permanent magnet slot 111 and the permanent magnet 12, thereby reducing the amount of the permanent magnet 12 compared with the prior art solution, and further reducing the production and manufacturing cost of the rotor, and further improving the cost performance of the rotor. Refer to Figure 5 It can be seen that the demagnetization rate when L1 is 0.12L2 is significantly lower than the demagnetization rate when L1 = 0. Where L1 represents the shortest distance between the first intersection point A and the first permanent magnet 121 or the second permanent magnet 122, that is, select a measurement point on the first permanent magnet 121 or the second permanent magnet 122 closest to the first intersection point A, and then measure the distance between the first intersection point A and the measurement point as L1. Since the first permanent magnet 121 and the second permanent magnet 122 in the technical solution of the present application are arranged at a non-180° angle, the measurement point is located at the corner of the first permanent magnet 121 and the second permanent magnet 122 closest to the first intersection point.

[0033] Among them, the measurement method of L2 is as follows: Select the center point of one end face in the length direction of the first permanent magnet 121 as the starting point. The center point is the intersection point of the diagonals of the four corners of the end face. Select the center point of the other end face in the length direction of the first permanent magnet 121 as the end point. The distance between the starting point and the end point is L2. The same applies to the second permanent magnet 122. Without considering process errors, the lengths and widths of the first permanent magnet 121 and the second permanent magnet 122 are the same.

[0034] The measurement method of W is as follows: Select the center point on one side wall in the width direction of the first permanent magnet 121 as the starting point. The center point is the intersection point of the diagonals of the four corners of the side wall surface. Select the center point on the other side wall in the width direction of the first permanent magnet 121 as the ending point. The distance between the starting point and the ending point is W.

[0035] Among them, if L1 ≤ mm, it indicates that one end of the first permanent magnet 121 and / or the second permanent magnet 122 facing the first intersection point A is too close to the symmetry line of the permanent magnet slot 111, resulting in a greater influence of the demagnetizing magnetic field generated by the current of the motor 1 on the permanent magnet 12, thereby reducing the demagnetization resistance of the rotor. If L1 > 0.15L2 and / or L1 > W, it indicates that the distance between the first permanent magnet 121 and the second permanent magnet 122 and the first intersection point A is too far, resulting in a large gap around the symmetry line of the permanent magnet slot 111, indicating that the proportion of the permanent magnet 12 in the rotor core 11 will be relatively reduced, resulting in a lower utilization rate of the permanent magnet 12. This means that in order to obtain the same magnetic flux, more permanent magnet 12 materials may need to be used, thereby increasing the cost. At the same time, the increase of L1 may cause the magnetic circuit between the permanent magnets 12 to become discontinuous, increasing the possibility of magnetic leakage. Among them, the units of L1, L2, and W are all millimeters, that is, mm.

[0036] It can be understood that the material of the permanent magnet 12 is usually rare earth materials such as neodymium iron boron, alnico, ferrite, and rare earth cobalt. These rare earth materials usually have high magnetic properties, can generate strong magnetic fields, and have good stability under appropriate conditions, and can maintain their magnetic properties for a long time. At the same time, their magnetic parameters such as remanence density, coercivity, and magnetic energy product are usually high, so they are widely used in fields such as the permanent magnet 12. However, the price of the permanent magnet 12 made of these rare earth materials is generally high, and in the production cost of the motor 1, the cost of the permanent magnet 12 accounts for a relatively high proportion. Therefore, by reducing the amount of the permanent magnet 12, the production costs of the motor 1 and the rotor can be significantly reduced.

[0037] In one embodiment, the permanent magnet slot 111 is arranged in a V shape. The V-shaped permanent magnet slot 111 increases the contact area between the permanent magnet 12 and the air gap, making the magnetic flux more easily pass through the air gap, thereby improving the utilization rate of the magnetic flux. This helps to increase the output torque of the motor 1 and improve the overall performance of the motor 1. At the same time, the gap of the V-shaped permanent magnet slot 111 is beneficial to the circulation of air, thereby improving the heat dissipation performance of the motor 1, reducing the operating temperature of the motor 1, and further helping to improve the reliability and service life of the motor 1. Of course, in other embodiments, the permanent magnet slot 111 can also be in a straight shape, a U shape, etc.

[0038] Specifically, the included angle between the first permanent magnet 121 and the second permanent magnet 122 in the same permanent magnet slot 111 is α, where 100° ≤ α ≤ 150°. When the included angle between the first permanent magnet 121 and the second permanent magnet 122 is between 100° and 150°, the magnetic field lines can be effectively guided, enabling the magnetic flux of the permanent magnet 12 to be more evenly distributed throughout the air gap. This, in turn, helps reduce magnetic leakage and magnetic resistance, and improves the utilization rate of the permanent magnet 12. A reasonable included angle α helps balance the operating point of the permanent magnet 12 and avoid the occurrence of local demagnetization. At the same time, it can also increase the magnetic linkage of the permanent magnet 12 to a certain extent, further enhancing the demagnetization resistance performance of the motor 1. Secondly, when the included angle between the first permanent magnet 121 and the second permanent magnet 122 is between 100° and 150°, it can also ensure that the rotor core 11 has sufficient high structural strength and precision to meet the stable operation requirements of the motor 1. Finally, by adjusting the included angle α, the electromagnetic performance of the motor 1 can be optimized, reducing the generation of harmonics and electromagnetic noise. This helps improve the operating quality and service life of the motor 1, and also enhances the user experience. The measurement method of the included angle α is as follows: Select the first permanent magnet 121 and the second permanent magnet 122 located in the same permanent magnet slot 111, then select two corresponding corners at the same position on the first permanent magnet 121 and the second permanent magnet 122 to draw the first straight line and the second straight line respectively. Then extend the first straight line and the second straight line until they intersect, and the included angle between the first straight line and the second straight line is measured as α.

[0039] Furthermore, if α > 150°, it will cause the magnetic circuit between the permanent magnets 12 to become discontinuous, increasing the possibility of magnetic leakage and reducing the effective magnetic flux of the permanent magnets 12, thus affecting the output torque and efficiency of the motor 1. At the same time, an excessively large included angle α may have an adverse effect on the structural strength of the rotor core 11. During high-speed rotation or under a large load, the rotor may deform or be damaged, affecting the stability and service life of the motor 1. If α < 100°, the magnetic flux of the permanent magnets 12 cannot be evenly distributed throughout the air gap, resulting in local magnetic flux density being too high or too low, affecting the electromagnetic performance and output characteristics of the motor 1. At the same time, a too small included angle α will cause the operating point of the permanent magnets 12 to deviate from the optimal range, increasing the risk of local demagnetization, thus reducing the demagnetization resistance performance of the motor 1 and further reducing the efficiency of the motor 1. And since α is in the relatively large range of 100° to 150°, the production and processing precision requirements for the first permanent magnet 121 and the second permanent magnet 122 are reduced, thereby reducing the production difficulty of the rotor and further reducing the production and manufacturing cost of the rotor.

[0040] In one embodiment, the distance between the first intersection point A and the second intersection point B is L3, where 0.5W < L3 < W + 0.2 mm. By reasonably setting the relationship between L3 and the width W of the permanent magnet 12, the arrangement of the permanent magnet 12 in the permanent magnet slot 111 is neither too compact nor too loose, which helps to optimize the magnetic circuit design, reduce magnetic leakage, increase the magnetic flux density, and thus enhance the output power and efficiency of the motor. At the same time, the distance between the permanent magnet 12 and the permanent magnet slot 111 is appropriate, which helps to reduce magnetic leakage and protect the permanent magnet 12 from the excessive influence of the demagnetizing magnetic field. If L3 > W + 0.2 mm, the arrangement of the permanent magnet 12 in the permanent magnet slot 111 will become too loose, resulting in an increase in the air gap in the magnetic circuit, a decrease in the magnetic flux density, and a reduction in the output power and efficiency of the motor 1. At the same time, an excessively large L3 value may also increase the possibility of magnetic leakage because the distance between the permanent magnet 12 and the wall of the permanent magnet slot 111 increases, causing some magnetic field lines to bypass the stator 20 winding and directly close through the air gap, further reducing the performance of the motor. Finally, an excessively large L3 will result in an overly large width of the permanent magnet slot 111, reducing the structural strength of the rotor core 11, increasing the possibility of deformation of the rotor core 11 during operation, and reducing the service life of the rotor core 11. If L3 < 0.5W, the friction between the permanent magnet 12 and the wall of the permanent magnet slot 111 will increase, increasing the energy consumption and wear during the operation of the motor 1 and reducing the overall performance and durability. Here, the unit of L3 is millimeter (mm).

[0041] In one embodiment, 2 ≤ P ≤ 5. When the number of pole pairs of the permanent magnet 12 is in the range of 2 to 5, the magnetic flux density of the motor 1 of the rotor is maintained within a good range, ensuring the torque and output power of the motor 1. Further, a larger number of pole pairs usually means a relatively lower rotational speed of the motor 1, which helps to reduce vibration and noise during operation and improve the running stability of the motor 1. At the same time, appropriately increasing the number of pole pairs helps to reduce the thicknesses of the stator and rotor yokes of the motor 1, thus saving materials and reducing the volume and weight of the motor 1. Secondly, a permanent magnet motor 1 with the number of pole pairs between 2 and 5 is relatively simple in design and manufacture, reducing the production and manufacturing difficulty and cost of the rotor and the motor 1.

[0042] In one embodiment, a rotating shaft hole 113 and a plurality of flow holes 112 are provided on the rotor core 11, and the plurality of flow holes 112 are arranged at intervals in a ring shape on the outer periphery of the rotating shaft hole 113. The rotating shaft hole 113 is used for installing a transmission shaft to drive a driven object to rotate; after the motor 1 is used for a long time, its temperature is likely to rise, which may easily cause the permanent magnet 12 to demagnetize, resulting in the loss or reduction of the magnetism of the permanent magnet 12. Therefore, in this embodiment, by providing the flow holes 112 on the rotor core 11, a refrigerant flows through the flow holes 112, and the temperature of the rotor core 11 can be reduced through the refrigerant, so as to maintain the temperature and performance of the permanent magnet 12 within the optimal range, thereby improving the performance and service life of the motor 1. Among them, the plurality of flow holes 112 are arranged in a ring shape on the outer periphery of the rotating shaft hole 113, so that the refrigerant can dissipate heat from the rotor core 11 evenly, further reducing the temperature of the rotor core 11, and improving the performance and service life of the rotor core 11.

[0043] The rotor core 11 is composed of a plurality of rotor punching sheets stacked in sequence. By setting the rotor core 11 as a plurality of rotor punching sheets, when processing the rotor core 11, only a plurality of rotor punching sheets need to be processed, and then the plurality of rotor punching sheet parts are assembled into the rotor core. Compared with processing a complete rotor core 11, the difficulty of processing the rotor punching sheet parts is reduced, which is convenient for realizing the automated production of the rotor core 11 through an automated production line, thereby reducing the production cost.

[0044] Refer to Figure 3 , the present invention also provides a motor 1, which includes a stator 20 and a rotor. The specific structure of the rotor refers to the above-mentioned embodiment. Since this motor 1 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, which will not be elaborated here one by one.

[0045] Refer to Figure 4 , the present invention also provides a compressor, which includes a motor 1. The specific structure of the motor 1 refers to the above-mentioned embodiment. Since this compressor 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, which will not be elaborated here one by one.

[0046] The present invention also provides a refrigeration device. Among them, refrigeration devices can be divided into compression refrigeration devices, absorption refrigeration devices, steam jet refrigeration devices, heat pump refrigeration devices, electrothermal refrigeration devices, etc. Refrigeration devices mainly include compressors, electronic expansion valves, evaporators, condensers and accessories, pipelines. Such as refrigerators, air conditioners, etc. The specific structure of the compressor refers to the above-mentioned embodiment. Since the refrigeration device in the present invention 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, which will not be elaborated here one by one.

[0047] The above are only exemplary embodiments of the present invention, and do 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 any direct / indirect application in other related technical fields, is included in the patent protection scope of the present invention.

Claims

1. A rotor, characterized in that: include: A rotor core, wherein a plurality of permanent magnet slots are arranged at intervals on the rotor core, and intersections of symmetry lines of the permanent magnet slots and slot walls of the permanent magnet slots are defined as a first intersection and a second intersection, wherein the first intersection is located on a side of the second intersection close to an outer peripheral wall of the rotor core; and A plurality of groups of permanent magnets, each group of the permanent magnets includes a first permanent magnet and a second permanent magnet, one permanent magnet slot corresponds to one group of the permanent magnets, the number of pole pairs of the permanent magnets is P, the width of the first permanent magnet and / or the second permanent magnet is W, the shortest distance between the first intersection and the first permanent magnet or the second permanent magnet is L1, and the length of the first permanent magnet and / or the second permanent magnet is L2, mm≤L1≤0.15L2, L1≤W, and the units of L1, L2 and W are all mm.

2. The rotor according to claim 1, characterized in that The permanent magnet slot is arranged in a V shape.

3. The rotor according to claim 2, characterized in that The included angle between the first permanent magnet and the second permanent magnet in the same permanent magnet slot is α, and 100°≤α≤150°.

4. The rotor according to claim 1, characterized in that The distance between the first intersection point and the second intersection point is L3, 0.5W<L3<W+0.2mm, and the unit of L3 is mm.

5. The rotor according to claim 1, characterized in that 2≤P≤5。 6. The rotor according to claim 1, characterized in that The rotor core is provided with a plurality of flow holes.

7. The rotor according to claim 1, characterized in that The rotor core is provided with a rotating shaft hole.

8. A motor, characterized in that: A rotor comprising any one of claims 1 to 7.

9. A compressor, characterized in that: Comprising the motor as claimed in claim 8.

10. A refrigeration device, characterized in that: Comprising the compressor of claim 9.

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