Motor, compressor and refrigeration equipment

Abstract

The invention discloses a motor, a compressor and refrigeration equipment, the motor comprises a stator and a rotor, the stator comprises a stator iron core and a winding, the stator iron core is provided with a stator groove, the stator iron core comprises a stator yoke and stator teeth, the stator teeth are connected to the stator yoke, the winding is wound on the stator teeth and located in the stator groove, the rotor comprises a rotor iron core and a permanent magnet, and the permanent magnet is arranged in the rotor iron core. Magnet grooves are formed in the rotor core, the permanent magnets are located in the magnet grooves, the outer diameter and the inner diameter of the stator core are D1 and D2 respectively, the thickness of the stator yoke is t, the width of each magnet groove is b, the thickness of each magnet groove is h, the number of poles of the rotor is 2p, the number of pieces of the permanent magnets is N, t is larger than or equal to 4.3 and smaller than or equal to 7.0, D2 / D1 is larger than or equal to 0.577 and smaller than or equal to 0.6, and b * h * 2p * N / 1000 is larger than or equal to 1.3 and smaller than or equal to 3.5. According to the technical scheme, by reasonably designing the size relation between the stator and the rotor, the overload capacity and efficiency of the motor are improved on the premise that the reliability of the motor is ensured and the cost is not greatly increased.

Description

Technical Field

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

[0002] In order to reduce costs and improve efficiency, the power density of compressor motors has been pushed to the limit. However, excessive power density of motors will lead to reliability problems, such as excessive electrical density and temperature rise of the motor, poor overload capacity of the motor, and a series of other problems. Summary of the invention

[0003] The main purpose of the present invention is to provide a motor, aiming to improve the overload capacity and efficiency of the motor by reasonably designing the size relationship between the stator and the rotor while ensuring the reliability of the motor and not significantly increasing the cost.

[0004] To achieve the above object, the motor provided by the present invention comprises:

[0005] A stator, the stator comprising a stator core and a winding, the stator core being provided with stator slots, the stator core comprising a stator yoke and stator teeth, the stator teeth being connected to the stator yoke, the winding being wound around the stator teeth and being located in the stator slots; and

[0006] A rotor, the rotor comprising a rotor core and a permanent magnet, the rotor core being provided with a magnet slot, the permanent magnet being located in the magnet slot;

[0007] Among them, the outer diameter and inner diameter of the stator core are D1 and D2 respectively, the thickness of the stator yoke is t, the width of the magnet slot is b, the thickness of the magnet slot is h, the number of poles of the rotor is 2p, the number of permanent magnets is N, 4.3≤t≤7.0, 0.577≤D2 / D1≤0.6, 1.3≤b*h*2p*N / 1000≤3.5.

[0008] Optionally, the number of stator slots is 12.

[0009] Optionally, the number of poles of the rotor is 2p=8; or the number of poles of the rotor is 2p=10.

[0010] Optionally, N=2p or N=4p.

[0011] Optionally, 70mm≤D1≤150mm.

[0012] Optionally, 1.2mm≤h≤2.5mm.

[0013] Optionally, the rotor is provided with flow holes for the flow of refrigerant.

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

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

[0016] The motor in the technical solution of the present invention includes a stator and a rotor, the stator includes a stator core and a winding, the stator core is provided with a stator slot, the stator core includes a stator yoke and stator teeth, the stator teeth are connected to the stator yoke, the winding is wound on the stator teeth, and the winding is located in the stator slot, the rotor includes a rotor core and a permanent magnet, the rotor core is provided with a magnet slot, and the permanent magnet is located in the magnet slot. Further, the outer diameter and inner diameter of the stator core are D1 and D2 respectively, the thickness of the stator yoke is t, the width of the magnet slot is b, the thickness of the magnet slot is h, the number of poles of the rotor is 2p, the number of permanent magnets is N, 4.3≤t≤7.0, 0.577≤D2 / D1≤0.6, 1.3≤b*h*2p*N / 1000≤3.5, and by reasonably setting the stator size and the rotor size, the overload capacity and efficiency of the motor are improved under the premise of ensuring the reliability of the motor and not significantly increasing the cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0018] Figure 1 A cross-sectional view of an embodiment of a motor of the present invention;

[0019] Figure 2 for Figure 1 Added annotated diagrams with various parameters;

[0020] Figure 3 It is a torque comparison diagram of the motor of the present invention;

[0021] Figure 4 This is a comparison diagram of the efficiency of the motor of the present invention.

[0022] Description of Figure Numbers:

[0023]

[0024]

[0025] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0027] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0028] In the present invention, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0029] In addition, the descriptions of "first", "second", etc. in the present invention are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, "and / or" in the full text includes three solutions. Taking A and / or B as an example, it includes technical solution A, technical solution B, and technical solution that satisfies both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0030] Reference Figure 1 and Figure 2 The present invention provides a motor, comprising:

[0031] A stator, the stator comprising a stator core 11 and a winding 12, the stator core 11 being provided with stator slots 113, the stator core 11 comprising a stator yoke 111 and stator teeth 112, the stator yoke 111 being arranged in an annular shape, the stator teeth 112 being arranged at intervals on the inner circumference of the stator yoke 111, the winding 12 being wound around the stator teeth 112 and being located in the stator slots 113; and

[0032] A rotor, the rotor comprising a rotor core 21 and permanent magnets, the rotor core 21 being provided with magnet slots 22, the permanent magnets being located in the magnet slots 22;

[0033] Among them, the outer diameter and inner diameter of the stator core 11 are D1 and D2 respectively, the thickness of the stator yoke 111 is t, the width of the magnet slot 22 is b, the thickness of the magnet slot 22 is h, the number of poles of the rotor is 2p, the number of permanent magnets is N, 4.3≤t≤7.0, 0.577≤D2 / D1≤0.6, 1.3≤b*h*2p*N / 1000≤3.5.

[0034] The motor in the technical solution of the present invention includes a stator and a rotor, the stator includes a stator core 11 and a winding 12, the stator core 11 is provided with a stator slot 113, the stator core 11 includes a stator yoke 111 and a stator tooth 112, the stator tooth 112 is connected to the stator yoke 111, the winding 12 is wound around the stator core 11, and the winding 12 is located in the stator slot 113, the rotor includes a rotor core 21 and a permanent magnet, the rotor core 21 is provided with a magnet slot 22, and the permanent magnet is located in the magnet slot 22. Further, the outer diameter and inner diameter of the stator core 11 are D1 and D2 respectively, the width of the magnet slot 22 is b, the thickness of the magnet slot 22 is h, the number of poles of the rotor is 2p, the number of permanent magnets is N, 0.577≤D2 / D1≤0.6, 1.3≤b*h*2p*N / 1000≤3.5, and by reasonably setting the stator size and rotor size, the overload capacity and efficiency of the motor are improved while ensuring the reliability of the motor and not significantly increasing the cost.

[0035] At the same time, by further limiting the inner diameter and outer diameter of the stator within the range of 0.577 to 0.6, the moment of inertia can be increased, which is conducive to the stable performance of the low-frequency energy efficiency of the compressor using the motor; at the same time, the motor has the best demagnetization ability, thereby obtaining higher system energy efficiency; at the same time, the use of rare earth elements is further reduced, thereby reducing the production cost of the motor, thereby improving the cost performance of the motor; further, by Figure 3 and Figure 4 The experimental data show that after reasonably setting the stator size and rotor size in this application, when the current is greater than 6A, the torque of this embodiment is significantly greater than the reference value, and at different speeds of 30rps / 60rps / 90rps, the motor efficiency of this embodiment is significantly higher than the reference value.

[0036] The stator core 11 includes a plurality of stator punchings stacked in sequence, and the stator slots 113 are arranged on the stator punchings. The rotor core 21 includes a plurality of rotor punchings stacked in sequence, and the magnet slots 22 are arranged on the rotor punchings. By providing a plurality of stator punchings and rotor punchings, when processing the stator core 11 and the rotor core 21, only a plurality of stator punchings or rotor punchings need to be processed, and then the plurality of stator punchings and rotor punching parts are assembled into the stator core 11 and the rotor core 21. Compared with processing a complete stator core 11 and rotor core 21, the difficulty of processing the stator punchings and rotor punching parts is reduced, which facilitates the automated production of the stator core 11 and the rotor core 21 through an automated production line, thereby reducing production costs.

[0037] In one embodiment, the rotor core 21 and the stator core 11 can be made of different materials or shapes, so as to meet the requirements of different processing technologies of the stator and the rotor, which is conducive to selecting suitable punching sheets to form the rotor core 21 and the stator core 11 according to the performance requirements of the motor, thereby ensuring good performance of the electrode, and also improving the wide application range of the motor. In another embodiment, the stator punching sheets stacked into the stator core 11 and the rotor punching sheets stacked into the rotor core 21 are the same, which is conducive to the mass production of punching sheets and reduces manufacturing costs.

[0038] Furthermore, the punching sheet is a soft magnetic material punching sheet, and the soft magnetic material can achieve a larger magnetization intensity with a smaller external magnetic field. The soft magnetic material has a low coercive force and a high magnetic permeability, which is beneficial to reducing the loss of the stator core 11 and / or the rotor core 21, that is, reducing the iron loss of the motor, and thus helping to improve the performance of the motor. Specifically, the punching sheet is a silicon steel sheet, and it is understandable that the punching sheet can also be made of other materials.

[0039] There are many factors that affect eddy current loss, including the cross-sectional area, thickness, frequency of induced electromotive force and magnetic flux density of the magnetic material. By arranging the rotor core 21 and the stator core 11 to be respectively composed of multiple layers of mutually insulated rotor punchings and stator punchings, the eddy current can be suppressed in each layer of rotor punchings or stator punchings, thereby reducing the eddy current loss generated thereby. That is, by avoiding interlayer eddy current conduction, the overall eddy current loss of the rotor core 21 and the stator core 11 can be significantly reduced. Specifically, the stator core 11 and the rotor core 21 are usually configured as silicon steel sheets, which can be the insulating surface layer formed by the paint film provided by them, or the insulating surface layer can be formed by applying insulating paint on the punching sheets without paint film by the motor manufacturer, or the punching sheets can be oxidized at the motor manufacturer to form the insulating surface layer.

[0040] In the related art, in order to ensure that the rotor core 21 does not have the problem of loose sheets or interlayer misalignment, or to ensure that the rotor core 21 does not deform due to the offset between the rotor core 21 punching sheets during the winding process of the coil winding 12, the motor core is required to have sufficient stacking riveting strength. In order to ensure that the motor core has sufficient stacking riveting strength, in this embodiment, a plurality of rivet holes 23 are provided on the rotor core 21. The cooperation between the rivets and the rivet holes 23 can meet the fixing strength between the silicon steel sheets, thereby avoiding the problem of interlayer misalignment of the silicon steel sheets in the subsequent processing process.

[0041] It should be noted that in order to reduce or even avoid the problem of inter-layer eddy current conduction caused by this stacked riveting structure, glue bonding can be used between the rotor punchings instead of the stacked riveting method, so that the insulating surface layer of the silicon steel sheet at the rivet hole 23 will not be damaged, thereby avoiding the problem of eddy current inter-layer conduction. However, due to the high price of glue and low production efficiency of the production line, it has not been used in the motor of the air-conditioning compressor.

[0042] In this embodiment, the stator slots 113 are provided with 12. The number of stator slots 113 of the current variable frequency motor for household air conditioner compressor is 6 or 9. First, the number of stator slots 113 determines the distribution mode of the stator winding 12, which in turn affects the magnetic field distribution of the motor. More stator slots 113 can provide a more uniform magnetic field distribution, reduce the inhomogeneity of the magnetic field, and thus improve the efficiency and performance of the motor. Secondly, within a certain range, increasing the number of stator slots 113 can reduce the magnetic field saturation phenomenon. When current passes through the stator winding 12, the magnetic field will cause the core to saturate, thereby reducing the efficiency and performance of the motor. Properly increasing the number of stator slots 113 can reduce the magnetic field saturation and improve the output power and efficiency of the motor. At the same time, fewer stator slots 113 may lead to the generation of harmonic magnetic fields, which will cause vibration and noise of the motor. Therefore, by increasing the number of stator slots 113, the generation of harmonic magnetic fields can be reduced, and the running stability and quietness of the motor can be improved. Therefore, in this embodiment, the number of stator slots 113 is set to 12, thereby increasing various performances of the motor, reducing noise generation, and improving the cost performance of the motor.

[0043] In this embodiment, the number of poles of the rotor is 2p=8; or the number of poles of the rotor is 2p=10. The number of rotor poles commonly used in households is generally 4 or 6; the speed of the motor is closely related to the number of poles of the rotor. Generally speaking, the more poles there are, the higher the speed is, and the higher the efficiency of the motor is. The more poles there are, the smaller the rotation diameter is, the higher the frequency of the electromotive force and magnetic field of each phase is, the greater the electromotive force per cycle is, and the higher the no-load speed of the motor is. Under load conditions, the speed will decrease under load conditions due to the allowable heat loss limiting the no-load speed, which is limited by the allowable load conditions, and the power consumption will also decrease accordingly. Therefore, in this embodiment, the efficiency of the motor is improved and the power consumption of the motor is reduced by setting the number of poles to 8 or 10.

[0044] In this embodiment, N=2p or N=4p. It should be noted that the number of rotor poles refers to the number of magnetic poles on the motor rotor, and the number of motor poles determines the performance and characteristics of the motor. The more the number of rotor poles, the greater the torque of the motor, but the speed will be lower. Conversely, the fewer the number of rotor poles, the faster the motor speed, but the torque will be lower. Therefore, by setting the number of rotor poles to 2p and 4p, both the torque requirement of the compressor and the speed requirement of the compressor can be met, thereby improving the cost performance of the motor.

[0045] In this embodiment, 70mm≤D1≤150mm. The outer diameter of the stator core 11 is D1, 70mm≤D1≤150mm. By limiting the outer diameter range of the stator punching sheet, the anti-demagnetization ability of the motor can be increased, thereby further reducing the use of rare earth elements, thereby reducing the production cost of the motor, and improving the cost performance of the motor. At the same time, the stator outer diameter in the range of 70 to 150 can meet the requirements of the motor used in the compressor.

[0046] In this embodiment, 1.2mm≤h≤2.5mm. The magnet slot 22 is matched with the permanent magnet in the thickness direction, so when h≤1.2mm, that is, the thickness of the permanent magnet is small, the magnetic flux density will be small, and the output power of the motor will be small, thereby reducing the efficiency of the motor; when x≥2.5mm, that is, the thickness of the permanent magnet is large, magnetic circuit saturation will occur, resulting in increased magnetic circuit loss, thereby reducing the efficiency of the motor; therefore, by controlling the thickness of the magnet slot 22 and the permanent magnet to between 1.2mm and 2.5mm, the output power of the motor can meet the requirements of the compressor, and at the same time, the thickness of the permanent magnet will not be too large, thereby reducing the magnetic circuit loss and improving the efficiency of the motor.

[0047] There are many factors that affect eddy current loss, including the cross-sectional area, thickness, frequency of induced electromotive force and magnetic flux density of the magnetic material. By arranging the rotor core 21 and the stator core 11 to be respectively composed of multiple layers of mutually insulated rotor punchings and stator punchings, the eddy current can be suppressed in each layer of rotor punchings or stator punchings, thereby reducing the eddy current loss generated thereby. That is, by avoiding interlayer eddy current conduction, the overall eddy current loss of the rotor core 21 and the stator core 11 can be significantly reduced. Specifically, the stator core 11 and the rotor core 21 are usually configured as silicon steel sheets, which can be the insulating surface layer formed by the paint film provided by them, or the insulating surface layer can be formed by applying insulating paint on the punching sheets without paint film by the motor manufacturer, or the punching sheets can be oxidized at the motor manufacturer to form the insulating surface layer.

[0048] In the related art, in order to ensure that the rotor core 21 does not have the problem of loose pieces or interlayer misalignment, or to ensure that the rotor core 21 does not deform due to the interlayer offset of the rotor core 21 during the winding process of the coil winding 12, the motor core is required to have sufficient stacking riveting strength. In order to ensure that the motor core has sufficient stacking riveting strength, in this embodiment, a plurality of rivet holes 23 are provided on the rotor core 21. The cooperation between the rivets and the rivet holes 23 can meet the fixing strength between the silicon steel sheets, thereby avoiding the problem of interlayer misalignment of the silicon steel sheets in the subsequent processing process.

[0049] It should be noted that in order to reduce or even avoid the problem of inter-layer eddy current conduction caused by this stacked riveting structure, glue bonding can be used between the rotor punchings instead of the stacked riveting method, so that the insulating surface layer of the silicon steel sheet at the rivet hole 23 will not be damaged, thereby avoiding the problem of eddy current inter-layer conduction. However, due to the high price of glue and low production efficiency of the production line, it has not been used in the motor of the air-conditioning compressor.

[0050] In the present embodiment, an axial hole 25 and a flow hole 24 are further provided on the rotor core 21. The axial hole 25 is used to install the transmission shaft, thereby driving the transmission object to rotate. After the motor is used for a long time, its temperature is likely to rise, which may easily lead to demagnetization of the permanent magnet, thereby causing the permanent magnet to lose its magnetism or reduce its magnetism. Therefore, in the present embodiment, a flow hole 24 is provided on the rotor core 21, and a refrigerant flows in the flow hole 24. The refrigerant can reduce the temperature of the rotor core 21, thereby maintaining the permanent magnet within an optimal range, thereby improving the performance of the motor.

[0051] In one embodiment, the mass percentage of the heavy rare earth element in the permanent magnet is in the range of 0 to 1.5%; or the mass percentage of dysprosium and / or terbium in the permanent magnet is in the range of 0 to 1.5%. Since dysprosium and terbium are heavy rare earth elements, and the mass percentage of heavy rare earth elements in the permanent magnet is positively correlated with the magnitude of the intrinsic coercive force hcj of the permanent magnet. Therefore, on the one hand, by limiting the mass percentage of dysprosium and / or terbium in the permanent magnet to 0 to 1.5%, it is beneficial to reduce the use of dysprosium and / or terbium while ensuring the good anti-demagnetization ability of the motor, thereby helping to reduce the manufacturing cost of the motor and improve the cost performance of the motor; on the other hand, by limiting the mass percentage of the heavy rare earth element in the permanent magnet to 0 to 1.5%, it is beneficial to reduce the use of heavy rare earth elements while ensuring the good anti-demagnetization ability of the motor, thereby helping to reduce the manufacturing cost of the motor and improve the cost performance of the motor.

[0052] In another embodiment, the mass percentage of dysprosium and / or terbium in the permanent magnet is 0. On the one hand, the mass percentage of dysprosium in the permanent magnet is 0, that is, the permanent magnet does not contain heavy rare earth element dysprosium, which reduces the consumption of heavy rare earth element dysprosium by the permanent magnet, which is beneficial to energy saving; on the other hand, the mass percentage of terbium in the permanent magnet is 0, that is, the permanent magnet does not contain heavy rare earth element terbium, which reduces the consumption of heavy rare earth element terbium by the permanent magnet, which is beneficial to energy saving; on the other hand, the sum of the mass percentages of dysprosium and terbium in the permanent magnet is 0, that is, the permanent magnet does not contain heavy rare earth elements dysprosium and terbium, which reduces the consumption of heavy rare earth elements dysprosium and terbium by the permanent magnet, which is beneficial to the sustainable development of resources, energy saving, and reducing the manufacturing cost of the motor, and is suitable for popularization and application.

[0053] It is understandable that the mass percentage of dysprosium and / or terbium in the permanent magnet can also be other values, for example, the mass percentage of dysprosium and / or terbium in the permanent magnet is 0.005%, 0.01%, 0.025%, etc. Further, the permanent magnet is a neodymium iron boron permanent magnet, which has excellent magnetic properties and can meet the use requirements of the motor.

[0054] Specifically, the remanence Br of the permanent magnet is in the range of 1.28T to 1.5T. Among them, remanence refers to the surface field retained after the permanent magnet is magnetized to technical saturation and the external magnetic field is removed, and Br is the residual magnetic induction intensity. By reasonably setting the remanence, under the same magnetic load, the larger the remanence Br value, the less the amount of rare earth elements in the permanent magnet, thereby reducing the manufacturing cost of the motor. At the same time, by reasonably setting the remanence, it is beneficial to reduce iron loss and thus improve the efficiency of the motor. Specifically, the remanence of the permanent magnet is 1.28T, or 1.32T, or 1.5T, wherein T is the unit Tesla.

[0055] The present invention also proposes a compressor, which includes a motor. The specific structure of the motor refers to the above-mentioned embodiments. Since the compressor of the present application adopts all the technical solutions of all the above-mentioned embodiments, it at least has all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be described one by one here.

[0056] The present invention also proposes a refrigeration device, which includes the above-mentioned compressor, wherein the refrigeration device can be but is not limited to a refrigerator, a freezer, an air conditioner and other equipment with a refrigeration function. The specific structure of the compressor refers to the above-mentioned embodiment. Since the refrigeration device of the present application adopts all the technical solutions of all the above-mentioned embodiments, it at least has all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be repeated here one by one.

[0057] The above descriptions are only optional embodiments of the present invention, and are not intended to limit the patent scope of the present invention. All equivalent structural changes made using the contents of the present invention's specification and drawings, or directly / indirectly applied in other related technical fields, are included in the patent protection scope of the present invention.

Claims

1. A motor, characterized in that: include: A stator, the stator comprising a stator core and a winding, the stator core being provided with stator slots, the stator core comprising a stator yoke and stator teeth, the stator teeth being connected to the stator yoke, the winding being wound around the stator teeth and being located in the stator slots; and A rotor, the rotor comprising a rotor core and a permanent magnet, the rotor core being provided with a magnet slot, the permanent magnet being located in the magnet slot; Among them, the outer diameter and inner diameter of the stator core are D1 and D2 respectively, the thickness of the stator yoke is t, the width of the magnet slot is b, the thickness of the magnet slot is h, the number of poles of the rotor is 2p, the number of permanent magnets is N, 4.3≤t≤7.0, 0.577≤D2 / D1≤0.6, 1.3≤b*h*2p*N / 1000≤3.

5.

2. The motor according to claim 1, characterized in that The stator is provided with 12 slots.

3. The motor according to claim 1, characterized in that The number of poles of the rotor is 2p=8; or the number of poles of the rotor is 2p=10.

4. The motor according to claim 1, characterized in that N=2p or N=4p.

5. The motor according to claim 1, characterized in that 70mm≤D1≤150mm.

6. The motor according to claim 1, characterized in that 1.2mm≤h≤2.5mm.

7. The motor according to claim 1, characterized in that The rotor is provided with flow holes for the flow of refrigerant.

8. A compressor, characterized in that: Comprising a motor as claimed in any one of claims 1 to 7.

9. A refrigeration device, characterized in that: Comprising the compressor of claim 8.

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