Motor, compressor and refrigeration equipment

Abstract

The invention discloses a motor, 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 comprises a plurality of stator punching sheets which are laminated in sequence, the stator punching sheets are provided with stator grooves, the stator punching sheets comprise stator yokes and stator teeth, the winding is wound on the stator teeth and is located in the stator grooves, and the stator yoke is provided with stator teeth. The rotor comprises a rotor iron core and permanent magnets, the rotor iron core comprises a plurality of rotor punching sheets which are laminated in sequence, magnet grooves are formed in the rotor punching sheets, the permanent magnets are installed in the magnet grooves, the inner diameter of the stator punching sheets is Di, the distance between the magnet grooves and the circle center of the rotor punching sheets 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 < = Di / 2-L < = 4.8, and 3 < = y-c * d < = 7. According to the technical scheme, the anti-demagnetization performance of the motor is guaranteed, the utilization rate of the permanent magnets is improved, and meanwhile the energy efficiency of the motor is improved through the reasonable structural design.

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 the compressor, and the efficiency of the motor directly affects the energy efficiency of the compressor. Currently, most compressor motors use variable frequency motors. With the rise in the price of 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 industry research.

[0003] Currently, the number of stator slots of variable frequency motors used in household air-conditioning compressors is 6, 9, and 12, and the number of rotor poles is 4, 6, and 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 number / pole number 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 object, the motor provided by the present invention comprises:

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

[0007] A rotor, wherein the rotor comprises a rotor core and permanent magnets, wherein the rotor core comprises a plurality of rotor punchings stacked in sequence, wherein 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, 0.4mm≤d≤1.5mm.

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

[0014] Optionally, 90mm≤D≤125mm.

[0015] Optionally, 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.

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

[0017] Optionally, the mass percentage of the heavy rare earth element 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 comprises a stator and a rotor, the stator comprises a stator core and a winding, the stator core comprises a plurality of stator punchings stacked in sequence, the stator punchings are provided with stator slots, the stator punchings comprise a stator yoke and stator teeth, the windings are wound around the stator teeth and are located in the stator slots, the rotor comprises a rotor core and a permanent magnet, the rotor core comprises 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 punchings is D i , the distance between the magnet slot and the center of the rotor punching 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, wherein when the windings are star-connected in series, c=1; when the windings are 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 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 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.

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

[0024] Figure 2 for Figure 1 Added annotated diagrams with various parameters;

[0025] Figure 3 It 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 It 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 slot 23 Magnet slot

[0030] 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

[0031] 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.

[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 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 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.

[0034] 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.

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

[0036] A stator, wherein the stator comprises a stator core 11 and a winding 12, wherein the stator core 11 comprises a plurality of stator punchings stacked in sequence, wherein the stator punchings are provided with stator slots 113, wherein the stator punchings comprise a stator yoke 111 and stator teeth 112, wherein the winding 12 is wound around the stator teeth 112 and is located in the stator slots 113; and

[0037] The rotor comprises a rotor core 21 and permanent magnets 22. The rotor core 21 comprises 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 sheet is D i , the distance between the magnet slot 23 and the center of the rotor punching 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 winding 12 is star-connected in series, c=1; when the winding 12 is delta-connected in series, c=2.

[0039] The motor of the technical solution of the present invention comprises a stator and a rotor, the stator comprises a stator core 11 and a winding 12, the stator core 11 comprises a plurality of stator punchings stacked in sequence, the stator punchings are provided with stator slots 113, the stator punchings comprise 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 comprises a rotor core 21 and a permanent magnet 22, the rotor core 21 comprises 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 punching 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, wherein 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, reasonable structural design improves the energy efficiency of the motor.

[0040] Furthermore, by providing a plurality of stator punching sheets and rotor punching sheets, when processing the stator core 11 and the rotor core 21, only a plurality of stator punching sheets or rotor punching sheets need to be processed, and then the plurality of stator punching sheets and rotor punching sheet 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 punching sheets and rotor punching sheet 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, 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.

[0042] 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.

[0043] 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.

[0044] 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 are provided on the rotor core 21. The cooperation of rivets and rivet holes can meet the fixing strength between silicon steel sheets, thereby avoiding the problem of interlayer misalignment of silicon steel sheets in subsequent processing.

[0045] 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, 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 the present embodiment, an axial hole and a flow hole are further provided on the rotor core 21. The axial hole 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 22, thereby causing the permanent magnet 22 to lose its magnetism or reduce its magnetism. Therefore, in the present embodiment, a flow hole is provided on the rotor core 21, and a refrigerant flows in the flow hole. The refrigerant can reduce the temperature of the rotor core 21, thereby maintaining the permanent magnet 22 within an optimal range, thereby improving the performance of the motor.

[0047] In this embodiment, 45 mm ≤ D i≤78mm. This can increase the moment of inertia, 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 and improving the cost performance of the motor.

[0048] Furthermore, 42.4 mm ≤ L ≤ 75.5 mm. By further limiting the position of the magnet slot 23 on the rotor punching sheet, the position of the magnet is reasonably placed, 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 instability wrinkling and tearing failure is reduced, thereby improving the performance and cost performance 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, it is necessary to occupy a larger motor space; 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 size 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 punching sheet is D, 85mm≤D≤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 thereby improving the cost performance of the motor. At the same time, the stator outer diameter in the range of 85 to 200 can meet the requirements of the motor used in the compressor.

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

[0053] It should be noted that the rotor with saturated magnetization is first placed at room temperature, and then the rotor magnetic flux φ0 is measured; then the rotor after the initial magnetic flux test is placed in a constant temperature box for more than 4 hours, and the temperature of the constant temperature box is set at the specified temperature of 130°C; then the test DC motor is connected to the DC power supply, and the demagnetization current is set according to the pre-set demagnetization current value (35A, 40A, 45A, etc.). After preparation, the rotor is taken out of the constant temperature box, and the demagnetization test tooling is installed. Under the DC demagnetization current, the rotor rotates one circle; after completion, the rotor is placed at room temperature for more than 4 hours, and then the temperature of the rotor assembly and the magnetic flux φ1 after demagnetization are measured. Finally, the demagnetization rate is calculated, and the calculation formula is as follows: (the temperature of φi needs to be the same as φ0 when calculating): Demagnetization rate = (φi-φ0) / φ0×100%.

[0054] Reference Figure 5 For a motor, the greater the demagnetization rate of the motor, the worse the motor performance. The reason is that after the motor is demagnetized, the motor magnetic load is reduced and the motor efficiency is reduced. In addition, when the demagnetization reaches a certain level, the motor will be irreversibly demagnetized, which will seriously affect the performance of the motor and the reliability of the whole machine. Please refer to the following embodiments for details:

[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-connected series 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 / 60rps 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 the corner 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 / 60rps conditions respectively.

[0057] In comparative example 1: stator outer diameter D = 90 mm, 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 the corner connection series c = 2, the winding 12 wire diameter d = 1.4, D i / 2-L=1.9, yc*d=2.9 are both out of the above ranges, the motor demagnetization rate is 2.3%, and the motor efficiency is 89.25% / 91.94% under 30 / 60rps conditions respectively.

[0058] In comparative example 2: stator outer diameter D = 90 mm, 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 corner connection series c = 2, the winding 12 wire diameter d = 1.5, D i / 2-L=5.5, yc*d=2.9 are both out of the above ranges, the motor demagnetization rate is 2.35%, and the motor efficiency is 88.92% / 91.59% under 30 / 60rps conditions respectively.

[0059] In comparative example 3: stator outer diameter D = 90 mm, 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-connected series c = 1, the winding 12 wire diameter d = 0.75, D i / 2-L=1.8, yc*d=7.25 are both out of the above ranges, the motor demagnetization rate is 2.5%, and the motor efficiency is 89.05% / 91.47% under 30 / 60rps conditions respectively.

[0060] In comparative example 4: the stator outer diameter D = 90 mm, the 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-connected series c = 1, the winding 12 wire diameter d = 0.65, D i / 2-L=5, yc*d=7.55 are both out of the above ranges, the motor demagnetization rate is 2.2%, and the motor efficiency is 88.98% / 90.62% under 30 / 60rps conditions respectively.

[0061]

[0062]

[0063]

[0064] As shown in the above table, from the experimental data of the above embodiments and comparative examples, when the motor demagnetization rate is the smallest, the motor efficiency is the highest. The stator outer diameter of the second embodiment is in the range of 85mm to 150mm, and the stator outer diameter of the first embodiment is in the range of 90mm to 125mm. 90mm to 125mm is to further reduce the size of the stator outer diameter D on the basis of 85mm to 150mm. 90mm to 125mm is a further optimization of 85mm to 150mm. The reason is that the corresponding effect of 90mm to 125mm will be better, such as the demagnetization and motor efficiency of the first embodiment are better than those of the second embodiment.

[0065] Optionally, the thickness of the stator sheet is in the range of 0.2 mm to 0.5 mm; and / or the thickness of the rotor sheet is in the range of 0.2 mm to 0.5 mm. The thickness of the stator sheet and the rotor sheet is limited to 0.2 mm to 0.5 mm. By reasonably setting the thickness of the stator sheet and the rotor sheet, it is beneficial to effectively reduce the iron loss and improve the magnetic permeability while ensuring the good mechanical strength of the stator core 11 and / or the rotor core 21. The reasonable range setting can also meet the working requirements of motors of different powers.

[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, 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 is in the range of 0 to 1.5%; or the mass percentage of dysprosium and / or terbium in the permanent magnet 22 is in the range of 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 magnitude of the intrinsic coercivity hcj of the permanent magnet 22, and the intrinsic coercivity is positively correlated with the anti-demagnetization ability 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 the good anti-demagnetization ability of the motor, thereby reducing the manufacturing cost of the motor and improving 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 22 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 reducing the manufacturing cost of the motor and improving the cost performance of the motor.

[0068] It is understandable 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. Further, 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 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.

[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 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.

[0072] 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 comprising a plurality of stator punchings stacked in sequence, the stator punchings being provided with stator slots, the stator punchings comprising a stator yoke and stator teeth, the winding being wound around the stator teeth and located in the stator slots; and A rotor, wherein the rotor comprises a rotor core and permanent magnets, wherein the rotor core comprises a plurality of rotor punchings stacked in sequence, wherein 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, characterized in that 45mm≤D i ≤78mm。 3. The motor according to claim 1, characterized in that 42.4mm≤L≤75.5mm.

4. The motor according to claim 1, characterized in that 5mm≤y≤10mm.

5. The motor according to claim 1, characterized in that 0.4mm≤d≤1.5mm.

6. The motor according to claim 1, characterized in that 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, characterized in that 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, characterized in that The thickness of the permanent magnet is x, 1.2 mm ≤ x ≤ 2.0 mm.

10. The motor according to claim 1, characterized in that The mass percentage of the heavy rare earth element 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, characterized in that 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: Comprising a motor as claimed in any one of claims 1 to 11.

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

Images