Motors, compressors and refrigeration equipment

Abstract

The present invention discloses a motor, a compressor and a refrigeration device, wherein the motor includes a stator and a rotor, the stator includes a stator core and a winding, the stator core includes a plurality of sequentially stacked stator punchings, the stator punchings are provided with stator slots, the stator punchings include a stator yoke and stator teeth, the windings are wound around the stator teeth and are located in the stator slots, the rotor includes a rotor core and a permanent magnet, the rotor core includes a plurality of sequentially stacked rotor punchings, the rotor punchings are provided with magnet slots, the permanent magnets are installed in the magnet slots, and the inner diameter of the stator punchings is D i , the distance between the magnet slot and the center of the rotor punch is L, the radial thickness of the stator yoke is y, the winding constant is c, the winding wire diameter is d, 2.0≤D i / 2-L≤4.8, 3≤y-c*d≤7. The technical solution of the present invention improves the utilization rate of permanent magnets while ensuring the anti-demagnetization performance of the motor. At the same time, the reasonable structural design improves the energy efficiency of the motor.

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] The motor is the power element of a compressor, and its efficiency directly impacts its energy efficiency. Currently, most compressor motors use variable-frequency motors. With rising prices for rare earth materials, the cost of variable-frequency motors has increased significantly. Therefore, more cost-effective variable-frequency motors for compressors are a hot topic in the current household appliance industry.

[0003] Currently, the number of stator slots of the variable frequency motor used in household air-conditioning compressors is 6, 9, or 12, and the number of rotor poles is 4, 6, or 8. The number of slots in the motor directly affects the demagnetization ability of the motor. That is, as the number of stator slots in the motor increases, the demagnetization ability of the motor increases. At the same time, for motors with the same slot / pole ratio, the more slots there are, the lower the efficiency of the corresponding motor will be. Summary of the Invention

[0004] The main purpose of the present invention is to provide a motor, aiming to improve the utilization rate of permanent magnets while ensuring the anti-demagnetization performance of the motor, and at the same time improve the energy efficiency of the motor through reasonable structural design.

[0005] To achieve the above-mentioned object, the motor proposed in the present invention includes:

[0006] a stator, the stator comprising a stator core and windings, the stator core comprising a plurality of sequentially stacked stator punchings, the stator punchings being provided with stator slots, the stator punchings comprising a stator yoke and stator teeth, the windings being wound around the stator teeth and located in the stator slots; and

[0007] The rotor comprises a rotor core and permanent magnets, wherein the rotor core comprises a plurality of rotor punchings stacked in sequence, the rotor punchings are provided with magnet slots, and the permanent magnets are installed in the magnet slots;

[0008] The inner diameter of the stator punching sheet is D i The distance between the magnet slot and the center of the rotor punch is L, the radial thickness of the stator yoke is y, the constant of the winding is c, the wire diameter of the winding is d, 2.0≤D i / 2-L≤4.8, 3≤yc*d≤7, when the windings are star-connected in series, c=1; when the windings are delta-connected in series, c=2.

[0009] Optionally, 45 mm ≤ D i ≤78mm.

[0010] Optionally, 42.4mm≤L≤75.5mm.

[0011] Optionally, 5mm≤y≤10mm.

[0012] Optionally, 0.4 mm ≤ d ≤ 1.5 mm.

[0013] Optionally, the outer diameter of the stator punching sheet is D, 85mm≤D≤150mm.

[0014] Optionally, 90mm≤D≤125mm.

[0015] Optionally, the stator punching sheet has a thickness ranging from 0.2 mm to 0.5 mm; and / or the rotor punching sheet has a thickness ranging from 0.2 mm to 0.5 mm.

[0016] Optionally, the thickness of the permanent magnet is x, 1.2 mm ≤ x ≤ 2.0 mm.

[0017] Optionally, the mass percentage of heavy rare earth elements in the permanent magnet is in the range of 0 to 2%; the mass percentage of dysprosium and / or terbium in the permanent magnet is in the range of 0 to 2%.

[0018] Optionally, the ratio of the number of stator slots of the motor to the number of rotor poles is k, k=3 / 2 or 6 / 5.

[0019] The present invention also provides a compressor comprising the motor as described above.

[0020] The present invention also provides a refrigeration device comprising the compressor as described above.

[0021] The motor of 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 includes a plurality of stator punchings stacked in sequence, the stator punchings are provided with stator slots, the stator punchings include a stator yoke and stator teeth, the windings are wound around the stator teeth and are located in the stator slots, the rotor includes a rotor core and a permanent magnet, the rotor core includes a plurality of rotor punchings stacked in sequence, the rotor punchings are provided with magnet slots, the permanent magnets are installed in the magnet slots, and further, the inner diameter of the stator punching is D i , the distance between the magnet slot and the center of the rotor punch is L, the radial thickness of the stator yoke is y, the winding constant is c, the winding wire diameter is d, 2.0≤D i / 2-L≤4.8, 3≤yc*d≤7, where c=1 when the windings are star-connected in series; and c=2 when the windings are delta-connected in series. This allows the technical solution of the present application to improve the utilization rate of permanent magnets while ensuring the anti-demagnetization performance of the motor, and at the same time, reasonable structural design improves the energy efficiency of the motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. 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 any creative work.

[0023] Figure 1 is a cross-sectional view of an embodiment of a motor of the present invention;

[0024] Figure 2 for Figure 1 Added annotation diagrams of various parameters;

[0025] Figure 3 This is a schematic diagram of the structure of the motor of the present invention when the windings are connected in star series;

[0026] Figure 4 This is a schematic diagram of the structure of the motor of the present invention when the windings are connected in series at an angle;

[0027] Figure 5 The figures are bar graphs and line graphs of experimental data of various embodiments and comparative examples of the motor of the present invention.

[0028] Description of Figure Numbers:

[0029] Label name Label name 11 stator core 12 Winding 111 stator yoke 21 rotor core 112 stator teeth 22 permanent magnet 113 stator slots 23 Magnet slot

[0030] The purpose, features and advantages of the present invention will be further described with reference to the accompanying drawings and in conjunction with the embodiments. DETAILED DESCRIPTION

[0031] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0032] 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 various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0033] In the present invention, unless otherwise specified or limited, the terms "connection" and "fixation" should be understood in a broad sense. For example, "fixation" can mean fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. Those skilled in the art will be able to understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0034] In addition, the descriptions of "first", "second", etc. in the present invention are only 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 they must be based on the ability of ordinary technicians in this field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0035] Reference Figures 1 to 4 The present invention provides a motor, comprising:

[0036] A stator, the stator comprising a stator core 11 and a winding 12, the stator core 11 comprising a plurality of sequentially stacked stator punchings, the stator punchings being provided with stator slots 113, the stator punchings comprising a stator yoke 111 and stator teeth 112, the winding 12 being wound around the stator teeth 112 and located in the stator slots 113; and

[0037] The rotor includes a rotor core 21 and permanent magnets 22. The rotor core 21 includes a plurality of rotor punchings stacked in sequence. The rotor punchings are provided with magnet slots 23. The permanent magnets 22 are installed in the magnet slots 23.

[0038] The inner diameter of the stator punching is D i The distance between the magnet slot 23 and the center of the rotor sheet is L, the radial thickness of the stator yoke 111 is y, the constant of the winding 12 is c, the wire diameter of the winding 12 is d, 2.0≤D i / 2-L≤4.8, 3≤yc*d≤7, when the windings 12 are star-connected in series, c=1; when the windings 12 are delta-connected in series, c=2.

[0039] The motor of 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 includes a plurality of stator punchings stacked in sequence. The stator punchings are provided with stator slots 113. The stator punchings include a stator yoke 111 and stator teeth 112. The winding 12 is wound around the stator teeth 112 and is located in the stator slots 113. The rotor includes a rotor core 21 and a permanent magnet 22. The rotor core 21 includes a plurality of rotor punchings stacked in sequence. The rotor punchings are provided with magnet slots 23. The permanent magnet 22 is installed in the magnet slots 23. Further, the inner diameter of the stator punching is D i The distance between the magnet slot 23 and the center of the rotor sheet is L, the radial thickness of the stator yoke 111 is y, the constant of the winding 12 is c, the wire diameter of the winding 12 is d, 2.0≤D i / 2-L≤4.8, 3≤yc*d≤7, where when the winding 12 is star-connected in series, c=1; when the winding 12 is delta-connected in series, c=2, so that the technical solution of the present application improves the utilization rate of the permanent magnet while ensuring the anti-demagnetization performance of the motor, and at the same time, the reasonable structural design improves the energy efficiency of the motor.

[0040] Furthermore, by setting the number of stator punchings and rotor punchings to be multiple, when processing the stator core 11 and the rotor core 21, only multiple stator punchings or rotor punchings need to be processed, and then the multiple 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.

[0041] In one embodiment, the rotor core 21 and the stator core 11 can be made of different materials or shapes, thereby meeting the requirements of different stator and rotor processing technologies. This facilitates the selection of appropriate punchings to form the rotor core 21 and stator core 11 based on the performance requirements of the motor, thereby ensuring good electrode performance and increasing the applicability of the motor. In another embodiment, the stator punchings stacked to form the stator core 11 and the rotor punchings stacked to form the rotor core 21 are the same, thereby facilitating mass production of the punchings and reducing manufacturing costs.

[0042] Furthermore, the punching sheets are made of soft magnetic material. Soft magnetic materials can achieve a large magnetization intensity with a small external magnetic field. Soft magnetic materials have low coercivity and high magnetic permeability, which are beneficial for reducing the loss of the stator core 11 and / or the rotor core 21, that is, reducing the iron loss of the motor, thereby improving the performance of the motor. Specifically, the punching sheets are silicon steel sheets, but it is understood that the punching sheets can also be made of other materials.

[0043] There are many factors that affect eddy current losses, including the cross-sectional area and thickness of the magnetic material, the frequency of the induced electromotive force, and the magnetic flux density. By configuring 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 currents can be suppressed within each layer of rotor punchings or stator punchings, thereby reducing the eddy current losses generated thereby. In other words, by avoiding interlayer eddy current conduction, the overall eddy current losses 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 have their own paint film to form an insulating surface layer, or can have the motor manufacturer apply insulating paint on the paint-free punching film to form an insulating surface layer, or can have the motor manufacturer oxidize the punching film to form an insulating surface layer.

[0044] In the related art, to ensure that the rotor core 21 does not become loose or misaligned between layers, or to ensure that the rotor core 21 does not deform due to inter-layer offset during the winding process of the coil winding 12, the motor core is required to have sufficient stacking riveting strength. To ensure this, the rotor core 21 is provided with multiple rivet holes in this embodiment. The coordination of the rivets and rivet holes ensures sufficient fixing strength between the silicon steel sheets, thereby preventing inter-layer misalignment of the silicon steel sheets during subsequent processing.

[0045] It should be noted that in order to reduce or even avoid the inter-layer eddy current conduction problem caused by this stacked riveting structure, the rotor punchings can be bonded with glue instead of the stacked riveting method, which can prevent the insulating surface of the silicon steel sheet at the rivet hole from being 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.

[0046] In this embodiment, an axial hole and a flow hole are further provided on the rotor core 21. The axial hole is used to install a 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 22, thereby causing the permanent magnet 22 to lose its magnetism or reduce its magnetism. Therefore, in this embodiment, a flow hole is provided on the rotor core 21, and a refrigerant flows through the flow hole. The refrigerant can reduce the temperature of the rotor core 21, thereby maintaining the permanent magnet 22 within the optimal range, thereby improving the performance of the motor.

[0047] In this embodiment, 45 mm ≤ D i≤78mm. This increases the moment of inertia, which helps stabilize the low-frequency energy efficiency of the compressor using this motor. It also optimizes the motor's demagnetization capability, resulting in higher system energy efficiency. It also further reduces the use of rare earth elements, lowering the motor's manufacturing costs and improving its cost-effectiveness.

[0048] Furthermore, 42.4 mm ≤ L ≤ 75.5 mm. By further limiting the position of the magnet slot 23 on the rotor sheet, the magnet is placed at a reasonable position, thereby increasing the anti-demagnetization capability of the motor and improving the efficiency of the motor.

[0049] Furthermore, 5mm≤y≤10mm. By limiting the radial thickness of the stator yoke 111 within a reasonable range, the possibility of motor failure due to instability, wrinkling, and tearing is reduced, thereby improving the performance and cost-effectiveness of the motor.

[0050] Specifically, 0.4mm≤d≤1.5mm. If d≤0.4mm, the gap of the winding 12 is small, and the problem of short circuit and overheating of the winding 12 is prone to occur, thereby reducing the reliability of the motor. At the same time, the small diameter of the wire will increase the resistance and loss of the winding 12, thereby reducing the efficiency of the motor; if d≥1.5mm, a larger motor space is required; at the same time, the larger the wire diameter, the greater the power. The motor in the technical solution of the present invention is used in a compressor. Therefore, d≤1.5mm can meet the power required by the compressor, thereby reducing the installation space required for the winding 12, thereby reducing the volume of the motor, which is conducive to the miniaturization of the motor; at the same time, d≥0.4mm, thereby increasing the gap of the winding 12, reducing the problem of short circuit and overheating of the winding 12, improving the reliability of the motor, reducing the resistance and loss of the winding 12, and improving the efficiency of the motor.

[0051] In this embodiment, the outer diameter of the stator laminations is D, 85 mm ≤ D ≤ 150 mm. By limiting the outer diameter range of the stator laminations, the motor's anti-demagnetization capability can be increased, further reducing the use of rare earth elements, thereby reducing the motor's manufacturing cost and improving the motor's cost-effectiveness. Furthermore, a stator outer diameter within the range of 85 to 200 mm meets the requirements of motors used in compressors.

[0052] Furthermore, 90 mm ≤ D ≤ 125 mm. By further limiting the outer diameter of the stator laminations, the anti-demagnetization performance of the motor can be further increased, thereby further reducing the use of rare earth elements, further reducing the production cost of the motor, and improving the cost performance of the motor.

[0053] It should be noted that the saturated rotor is first placed at room temperature, and the rotor magnetic flux φ0 is measured. The rotor, after the initial magnetic flux test, is then placed in a constant temperature oven for more than four hours, with the oven temperature set to the specified temperature of 130°C. The test DC motor is then connected to a DC power supply, and the demagnetization current is set according to the pre-set demagnetization current value (35A, 40A, 45A, etc.). When ready, the rotor is removed from the constant temperature oven, the demagnetization test fixture is installed, and the rotor rotates one circle under the DC demagnetization current. After completion, the rotor is placed at room temperature for more than four hours, and the temperature of the rotor assembly and the magnetic flux φ1 after demagnetization are measured. Finally, the demagnetization rate is calculated using the following formula: (φi needs to be calculated at the same temperature as φ0): Demagnetization rate = (φi - φ0) / φ0 × 100%.

[0054] Reference Figure 5 For a motor, the greater the demagnetization rate, the worse the motor performance. This is because after the motor is demagnetized, the motor magnetic load decreases and the motor efficiency decreases. In addition, when the demagnetization reaches a certain level, the motor will experience irreversible demagnetization, which will seriously affect the performance of the motor and the reliability of the entire machine. For details, refer to the following examples:

[0055] In the first embodiment, the stator outer diameter D = 90 mm, the stator inner diameter D i =54.9mm, the distance from the magnet slot 23 to the rotor center L = 25, the stator yoke 111 thickness y = 5.7mm, the winding 12 mode is star series connection c = 1, the winding 12 wire diameter d = 0.65, D i / 2-L=2.45, yc*d=5.05 are both within the above ranges, the motor demagnetization rate is 2.1%, and the motor efficiency is 89.81% / 92.29% under 30 / 60 rps conditions respectively.

[0056] In the second embodiment, the stator outer diameter D = 150 mm, the stator inner diameter D i =90mm, the distance from the magnet slot 23 to the rotor center L = 42, the stator yoke 111 thickness y = 8.5mm, the winding 12 mode is delta connection series c = 2, the winding 12 wire diameter d = 0.85, D i / 2-L=3, yc*d=6.8 are both within the above ranges, the motor demagnetization rate is 2.14%, and the motor efficiency is 89.51% / 92.02% under 30 / 60 rps conditions respectively.

[0057] In comparative example 1, the stator outer diameter D = 90 mm, the stator inner diameter D i =55mm, the distance from the magnet slot 23 to the rotor center L = 25.6, the stator yoke 111 thickness y = 5.7mm, the winding 12 mode is delta connection series c = 2, the winding 12 wire diameter d = 1.4, D i / 2-L=1.9 and yc*d=2.9 are both outside the above ranges. The motor demagnetization rate is 2.3%, and the motor efficiency is 89.25% / 91.94% under 30 / 60 rps conditions respectively.

[0058] In comparative example 2, the stator outer diameter D = 90 mm, the stator inner diameter D i =53mm, the distance from the magnet slot 23 to the rotor center L = 21, the stator yoke 111 thickness y = 5.9mm, the winding 12 mode is delta series c = 2, the winding 12 wire diameter d = 1.5, D i / 2-L=5.5 and yc*d=2.9 are both outside the above ranges. The motor demagnetization rate is 2.35%, and the motor efficiency is 88.92% / 91.59% under 30 / 60 rps conditions respectively.

[0059] In comparative example 3, the stator outer diameter D = 90 mm, the stator inner diameter D i =50.5mm, the distance from the magnet slot 23 to the rotor center L = 23.45, the stator yoke 111 thickness y = 8mm, the winding 12 mode is star series connection c = 1, the winding 12 wire diameter d = 0.75, D i / 2-L=1.8 and yc*d=7.25 are both outside the above ranges. The motor demagnetization rate is 2.5%, and the motor efficiency is 89.05% / 91.47% under 30 / 60 rps conditions respectively.

[0060] In comparative example 4: stator outer diameter D = 90 mm, stator inner diameter D i =51.5mm, the distance from the magnet slot 23 to the rotor center L = 20.75, the stator yoke 111 thickness y = 8.2mm, the winding 12 mode is star series connection c = 1, the winding 12 wire diameter d = 0.65, D i / 2-L=5 and yc*d=7.55 are both outside the above ranges. The motor demagnetization rate is 22%, and the motor efficiency is 8898% / 9062% under 30 / 60 rps conditions respectively.

[0061]

[0062]

[0063]

[0064] As shown in the table above, based on the experimental data from the above embodiments and comparative examples, motor efficiency is highest when the motor demagnetization rate is minimized. The stator outer diameter range for Embodiment 2 is 85 mm to 150 mm, while the stator outer diameter for Embodiment 1 is 90 mm to 125 mm. The range of 90 mm to 125 mm represents a further reduction in the stator outer diameter D from the range of 85 mm to 150 mm. The range of 90 mm to 125 mm is a further optimization of the range of 85 mm to 150 mm. This is because the range of 90 mm to 125 mm produces better results, as shown by the superior demagnetization and motor efficiency of Embodiment 1 compared to Embodiment 2.

[0065] Optionally, the thickness of the stator laminations ranges from 0.2 mm to 0.5 mm; and / or the thickness of the rotor laminations ranges from 0.2 mm to 0.5 mm. Limiting the thickness of the stator and rotor laminations to 0.2 mm to 0.5 mm and properly setting the thickness of the stator and rotor laminations helps effectively reduce iron loss and improve magnetic permeability while ensuring good mechanical strength of the stator core 11 and / or rotor core 21. Reasonable range settings can also meet the operating requirements of motors of different power.

[0066] Reference Figure 2 In this embodiment, the thickness of the permanent magnet 22 is x, 1.2mm≤x≤2.0mm. When x≤1.2mm, that is, when the thickness of the permanent magnet 22 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≥2.0mm, 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 permanent magnet 22 between 1.2mm and 2.0mm, the output power of the motor can meet the requirements of the compressor, while the thickness of the permanent magnet 22 will not be too large, thereby reducing the magnetic circuit loss and improving the efficiency of the motor.

[0067] In one embodiment, the mass percentage of the heavy rare earth element in the permanent magnet 22 ranges from 0 to 1.5%; or the mass percentage of dysprosium and / or terbium in the permanent magnet 22 ranges from 0 to 1.5%. Since dysprosium and terbium are heavy rare earth elements, and the mass percentage of the heavy rare earth element in the permanent magnet 22 is positively correlated with the intrinsic coercivity hcj of the permanent magnet 22, and the intrinsic coercivity is positively correlated with the demagnetization resistance of the motor. Therefore, on the one hand, by limiting the mass percentage of dysprosium and / or terbium in the permanent magnet 22 to 0 to 1.5%, it is beneficial to reduce the use of dysprosium and / or terbium while ensuring good demagnetization resistance of the motor, thereby reducing the manufacturing cost of the motor and improving the cost-effectiveness of the motor. On the other hand, by limiting the mass percentage of the heavy rare earth element in the permanent magnet 22 to 0 to 1.5%, it is beneficial to reduce the use of heavy rare earth elements while ensuring good demagnetization resistance of the motor, thereby reducing the manufacturing cost of the motor and improving the cost-effectiveness of the motor.

[0068] It is understood that the mass percentage of dysprosium and / or terbium in the permanent magnet 22 may also be other values, for example, the mass percentage of dysprosium and / or terbium in the permanent magnet 22 is 0.005%, 0.01%, 0.025%, etc. Furthermore, the permanent magnet 22 is a neodymium iron boron permanent magnet, which has excellent magnetic properties and can meet the use requirements of the motor.

[0069] Specifically, the ratio of the number of stator slots 113 of the motor to the number of rotor poles is k, k = 3 / 2 or 6 / 5. When k = 3 / 2 or 6 / 5, the efficiency of the motor is higher, thereby increasing the cost performance of the motor.

[0070] 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 of this application adopts all the technical solutions of all the above-mentioned embodiments, it has at least all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be repeated here one by one.

[0071] 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 refrigerators, freezers, air conditioners and other devices with refrigeration functions. The specific structure of the compressor refers to the above-mentioned embodiments. Since the refrigeration device of this 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.

[0072] The above descriptions are merely optional embodiments of the present invention and do not limit the patent scope of the present invention. All equivalent structural transformations made using the contents of the present description and drawings under the inventive concept of the present invention, or direct / indirect applications 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 windings, the stator core comprising a plurality of sequentially stacked stator punchings, the stator punchings being provided with stator slots, the stator punchings comprising a stator yoke and stator teeth, the windings being wound around the stator teeth and located in the stator slots; and The rotor comprises a rotor core and permanent magnets, wherein the rotor core comprises a plurality of rotor punchings stacked in sequence, the rotor punchings are provided with magnet slots, and the permanent magnets are installed in the magnet slots; The inner diameter of the stator punching sheet is D i The distance between the magnet slot and the center of the rotor punch is L, the radial thickness of the stator yoke is y, the constant of the winding is c, the wire diameter of the winding is d, 2.0≤D i / 2-L≤4.8, 3≤yc*d≤7, when the windings are star-connected in series, c=1; when the windings are delta-connected in series, c=2.

2. The motor according to claim 1, wherein 45mm≤D i ≤78mm。 3. The motor according to claim 1, wherein 42.4mm≤L≤75.5mm.

4. The motor according to claim 1, wherein 5mm≤y≤10mm.

5. The motor according to claim 1, wherein 0.4mm≤d≤1.5mm.

6. The motor according to claim 1, wherein The outer diameter of the stator punching sheet is D, 85mm≤D≤150mm.

7. The motor according to claim 6, characterized in that 90mm≤D≤125mm.

8. The motor according to claim 1, wherein The thickness of the stator punching sheet ranges from 0.2 mm to 0.5 mm; and / or the thickness of the rotor punching sheet ranges from 0.2 mm to 0.5 mm.

9. The motor according to claim 1, wherein The thickness of the permanent magnet is x, 1.2 mm ≤ x ≤ 2.0 mm.

10. The motor according to claim 1, wherein The mass percentage of heavy rare earth elements in the permanent magnet is in the range of 0 to 2%; the mass percentage of dysprosium and / or terbium in the permanent magnet is in the range of 0 to 2%.

11. The motor according to claim 1, wherein The ratio of the number of stator slots of the motor to the number of rotor poles is k, k=3 / 2 or 6 / 5.

12. A compressor, characterized in that: The motor comprises the motor according to any one of claims 1 to 11.

13. A refrigeration device, characterized in that: Comprising the compressor of claim 12.

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