Motor, compressor and refrigeration equipment

Abstract

The invention discloses a motor, a compressor and refrigeration equipment, the motor comprises a stator punching sheet, the stator punching sheet comprises a plurality of stator teeth, a coil and an annular stator yoke, the plurality of stator teeth are arranged at intervals along the circumferential direction of the inner ring surface of the stator yoke so as to form a stator slot between any two adjacent stator teeth, and the coil is arranged in the stator slot. The width of the stator teeth is W, the coil is wound on the stator teeth, the conductivity of the coil is sigma, the diameter of the coil is phi, and the relationship among W, sigma and phi is (sigma / 107)-3.5 < = phi < = W / 5. According to the technical scheme, the winding coil made of a low-conductivity material can be used, the use requirement of the compressor is met, the production cost of the motor is reduced, and the cost performance of the motor is improved.

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] Competition in the existing air-conditioning industry has already reached a fierce stage. Compressor motor technology is constantly improving, and motors mainly focus on performance, cost, noise and process.

[0003] In the prior art, the motor of a household air-conditioning compressor mainly adopts a copper wire motor. Although copper has a high conductivity, the price of copper wire is high, which easily causes the production cost of the motor to be high. Summary of the invention

[0004] The main purpose of the present invention is to provide a motor, aiming to reduce the production cost of the motor.

[0005] To achieve the above-mentioned object, the present invention provides a motor, wherein the motor comprises a stator punching sheet, wherein the stator punching sheet comprises an annular stator yoke, a coil, and a plurality of stator teeth, wherein the plurality of stator teeth are arranged at intervals along the circumferential direction of the inner annular surface of the stator yoke to form a stator slot between any two adjacent stator teeth, wherein the width of the stator teeth is W, the coil is wound around the stator teeth, the conductivity of the coil is σ, and the diameter of the coil is W, σ and The relationship is:

[0006] Optionally, the range of the conductivity σ is: 3×10 7 ≤σ≤4×10 7 .

[0007] Optionally, the outer annular surface of the stator punching sheet is provided with a plurality of grooves.

[0008] Optionally, the motor further comprises a rotor punching sheet, the rotor punching sheet is provided with a plurality of magnet slots, and the magnet slots are configured as V-shaped slots, U-shaped slots, W-shaped slots, straight-shaped slots or I-shaped slots.

[0009] Optionally, the number of the magnet slots is 10, and the number of the stator slots is 15.

[0010] Optionally, the material of the rotor punching sheet is configured as a soft magnetic material.

[0011] Optionally, the material of the rotor punching sheet is configured as silicon steel sheet.

[0012] Optionally, the thickness of the rotor punching sheet is d, and the range of d is 0.2mm≤d≤0.35mm.

[0013] The present invention also provides a compressor, comprising the above-mentioned motor.

[0014] The present invention also provides a refrigeration device, comprising the above-mentioned compressor.

[0015] The above motor has at least the following beneficial effects:

[0016] The technical solution of the present invention adopts a stator punching sheet, which includes an annular stator yoke, a coil, and a plurality of stator teeth. The plurality of stator teeth are arranged at intervals along the circumferential direction of the inner ring surface of the stator yoke to form a stator slot between any two adjacent stator teeth. The width of the stator tooth is W. The coil is wound around the stator tooth. The conductivity of the coil is σ. The diameter of the coil is W, σ, and The relationship is: Specifically, the technical solution of the present application limits the diameter of the coil to (σ / 10 7 )-3.5 to W / 5, winding coils made of low conductivity materials can be used, which is beneficial to reduce the production cost of the motor and improve the cost performance of the motor while meeting the use requirements of the compressor. 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 It is a structural schematic diagram of a first embodiment of a stator punching sheet and a rotor punching sheet of a motor of the present invention;

[0019] Figure 2 It is a structural schematic diagram of a second embodiment of a stator punching sheet and a rotor punching sheet of a motor;

[0020] Figure 3 The figure is a comparison chart of the cost and energy efficiency of the motor of the present invention and the motor of the prior art.

[0021] Description of Figure Numbers:

[0022] Label name Label name 100 Stator punching 140 Stator slot 110 Stator yoke 150 Grooves 120 Coil 200 Rotor punching 130 Stator teeth 210 Magnet slot

[0023] 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

[0024] 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.

[0025] 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.

[0026] 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.

[0027] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the meaning of "and / or" appearing in the full text includes three parallel schemes. Taking "A and / or B" as an example, it includes scheme A, or scheme B, or a scheme 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 the field to implement. 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.

[0028] The present invention provides a motor.

[0029] Reference Figures 1 to 3In one embodiment of the present invention, the motor includes a stator punching sheet 100, the stator punching sheet 100 includes an annular stator yoke 110, a coil 120, and a plurality of stator teeth 130, the plurality of stator teeth 130 are arranged at intervals along the circumferential direction of the inner annular surface of the stator yoke 110 to form a stator slot 140 between any two adjacent stator teeth 130, the width of the stator teeth 130 is W, the coil 120 is wound around the stator teeth 130, the conductivity of the coil 120 is σ, and the diameter of the coil 120 is W, σ, and The relationship is:

[0030] It should be noted that the unit of the conductivity σ is S / M, the unit of the width W of the stator tooth 130 is mm, and the unit of the diameter of the coil 120 is The unit is mm.

[0031] Specifically, by Figure 3 The cost and energy efficiency comparison diagram of the motor of the present invention and the prior art motor shows that the technical solution of the present application limits the diameter of the coil 120 to (σ / 10 7 )-3.5 to W / 5, a winding coil 120 made of a low conductivity material can be used, which is beneficial for reducing the production cost of the motor and improving the cost performance of the motor while meeting the use requirements of the compressor.

[0032] Optionally, the range of conductivity σ is: 3×10 7 ≤σ≤4×10 7 It should be noted that the unit of conductivity is S / M. The conductivity σ is 3×10 7 (S / M)≤σ≤4×10 7 The material price of (S / M) is relatively low, which can reduce the production cost of the motor and improve the cost performance of the motor while meeting the use requirements of the compressor.

[0033] Optionally, the stator core is formed by stacking stator punching sheets 100. On the one hand, the preparation process is mature and the finished product has high strength, which is conducive to ensuring the service life of the stator core and thus reducing production costs. On the other hand, by using silicon steel sheets as the raw materials for the stator punching sheets 100, the silicon steel sheets have low iron loss, high stacking coefficient, good magnetic induction intensity and good punching properties, thereby ensuring good working performance of the stator core.

[0034] Furthermore, in one embodiment, the stator teeth 130 are made of oriented electrical steel material, and the stator yoke 110 is made of non-oriented electrical steel material. Since the cost of non-oriented electrical steel material is lower and the iron loss of oriented electrical steel material is smaller, and the magnetic induction is better, this can avoid the need to replace all the stator punching sheets 100 with oriented electrical steel material when replacing them. Only the stator teeth 130 need to be replaced with oriented electrical steel material, which is beneficial to reducing costs. On the other hand, the excellent magnetic directivity of the oriented electrical steel material is utilized to improve the tooth magnetic permeability of the stator core and reduce the tooth iron loss, thereby improving the efficiency of the motor.

[0035] Furthermore, multiple stator slots 140 and multiple stator teeth 130 are evenly distributed along the circumference of the stator yoke 110, and the structures of the stator slots 140 and the stator teeth 130 are the same. On the one hand, the preparation process is simpler and the preparation efficiency of the stator core is higher. On the other hand, it is beneficial to ensure that the operating performance of the motor is in a better performance state.

[0036] Furthermore, each stator tooth 130 includes a first tooth shoe and a second tooth shoe, wherein the first tooth shoe and the second tooth shoe both extend along the circumferential direction of the annular stator yoke 110, the first tooth shoe is located on a first side of the center line of the stator tooth 130, and the second tooth shoe is located on a second side of the center line. The arrangement of the first tooth shoe and the second tooth shoe can prevent the magnetic force generated when the motor is working from causing the coil 120 to gradually move toward the rotor core, thereby preventing the coil 120 from being separated from the stator tooth 130, improving the working stability of the coil 120, and extending the service life of the motor.

[0037] Furthermore, the first tooth shoe of one stator tooth 130 of two adjacent stator teeth 130 is not in contact with the second tooth shoe of the other stator tooth 130, that is, the stator slot 140 formed between the two adjacent stator teeth 130 has a notch, and the notch is also opened facing the rotor opening, that is, the gap between the adjacent first tooth shoe and the second tooth shoe. If the notch of the stator slot 140 is too small, it may be difficult to wind the coil 120. At the same time, the four corners of the stator slot 140 are arranged in an arc shape. Such an arrangement can ensure the mechanical strength of the end where the stator tooth 130 and the stator yoke 110 are connected, and at the same time, it can also improve the slot area utilization rate of the stator slot 140.

[0038] Furthermore, the first tooth shoe and the second tooth shoe are symmetrically arranged about the center line of the stator tooth 130, which can facilitate processing. The purpose of using the stator tooth 130 with a symmetrical structure is twofold, namely (1) meeting the requirements of bidirectional rotation of the motor; and (2) avoiding the introduction of excessive magnetic field harmonics. Of course, it is not limited to a symmetrical arrangement.

[0039] Furthermore, the tooth top of the stator tooth 130 includes an inwardly curved arc portion, that is, the end of the stator tooth 130 away from the stator yoke 110 includes an inwardly curved arc portion, and “inwardly” in this embodiment refers to the direction toward the center of the stator punching sheet 100 .

[0040] Preferably, the radii of the arc portions of the plurality of stator teeth 130 are equal and are concentric with the center of the stator punching sheet 100. Thus, when the stator is injection molded, the outer diameter of the inner mold can be set to be consistent with the radius of the arc portion, so that the inner mold can be positioned at the arc portion for injection molding.

[0041] Furthermore, the bottom of the stator slot 140 is arranged in an arc shape, and the arc coincides with the inner circumference of the stator yoke 110. Such an arrangement is beneficial to the magnetic force distribution when the motor is running.

[0042] Optionally, the outer annular surface of the stator punching sheet 100 is provided with a plurality of grooves 150. The grooves 150 are symmetrical about the center line of the stator teeth 130, and the inner wall of the groove 150 is constructed as a three-section structure, including two side walls and a bottom wall. Specifically, the inner wall of the groove 150 is composed of three planes, namely, two side walls and a bottom wall, and the intersection of the side wall and the bottom wall is a rounded structure. The end face of the groove 150 is an isosceles trapezoidal structure, and the width of the notch is greater than the width of the groove bottom. Such a structure maximizes the flow area of ​​the motor stator while ensuring easy processing, thereby increasing the cooling capacity of the compressor with a minimum volume, and the use of such a groove 150 structure can optimize the magnetic circuit structure from the stator teeth 130 to the stator yoke 110, thereby reducing the iron loss during motor operation, improving the performance efficiency of the motor, and helping to improve the power density; and such a groove 150 structure on the outer circle of the motor stator can increase the flow channel for the refrigerant, thereby increasing the total flow area of ​​the motor, providing a guarantee for the increase in the cooling capacity of small compressors, so that small compressors also have a larger cooling capacity, which is conducive to the miniaturization of the compressor.

[0043] It should be noted that a plurality of stator punching sheets 100 are stacked to form a stator core, and a plurality of grooves 150 on the stator punching sheets 100 are stacked to form a stator flow slot. The flow slot can provide a larger refrigerant flow channel on the stator side, ensuring that the refrigerant compressed by the compressor pump body can be discharged from the exhaust hole through the motor more smoothly, which is beneficial to improving the performance of the compressor, and the circulation of more refrigerant is beneficial to the heat dissipation of the motor, and the heat generated by the motor winding is transferred out through the refrigerant.

[0044] Furthermore, in the present embodiment, the stator sheet 100 is an integrated structure, and the integrated structure can increase the structural strength of the stator sheet 100. In another embodiment, the stator sheet 100 is a block structure. The block structure is to divide the stator sheet 100 into a plurality of small structures, which are processed separately and then assembled. In one embodiment, each small structure includes a stator tooth 130 and a part of the stator yoke 110, which can be processed separately on each stator tooth 130 and then assembled together. These two structures have their own advantages and can be selected according to actual needs.

[0045] Optionally, the motor further includes a rotor punching 200, and the rotor punching 200 is provided with a plurality of magnet slots 210, and the magnet slots 210 are configured as V-shaped slots, U-shaped slots, W-shaped slots, straight-shaped slots or I-shaped slots.

[0046] It should be noted that the magnet slot 210 is used for installing the permanent magnet.

[0047] Furthermore, in the present embodiment, the magnet slot 210 is arranged in a straight line. This is because the straight line magnet slot 210 has a simple structure and a low process cost, which facilitates reducing the production cost of the rotor core.

[0048] Optionally, in the second embodiment, the magnet slot 210 is arranged in a V-shape; by arranging the V-shaped magnet slot 210 on the rotor punching 200 and optimizing the angle parameters of the V-shaped magnet slot 210, the amount of permanent magnets embedded in the rotor punching 200 proposed by the present invention is significantly improved compared with the prior art. The V-shaped magnet slot 210 can increase the amount of embedded permanent magnets, thereby increasing the torque density of the motor, and further effectively increasing the back electromotive force of the motor and the efficiency of the motor. Through this V-shaped magnet slot 210 structure, the amount of embedded permanent magnets is significantly increased, thereby increasing the torque density of the motor, which can meet the requirements of high efficiency and miniaturization of the motor.

[0049] Optionally, in other embodiments, the magnet slot 210 may also be provided as a U-shaped magnet slot 210, a W-shaped magnet slot 210 or an I-shaped magnet slot 210, which may be selected according to actual needs during specific implementation.

[0050] It should be noted that magnet slots 210 of different shapes can be provided according to different requirements, that is, the shapes of the magnet slots 210 of the same rotor core can be the same or different.

[0051] Optionally, the rotor punching 200 is formed by stacking rotor punchings 200. On the one hand, the preparation process is mature and the finished product has high strength, which is conducive to ensuring the service life of the rotor core and thus reducing production costs. On the other hand, by using silicon steel sheets as the raw materials for the stator punchings 100, the silicon steel sheets have low iron loss, high stacking coefficient, good magnetic induction intensity and good punching properties, thereby ensuring good working performance of the rotor core.

[0052] Optionally, the number of the magnet slots 210 is 10, and the number of the stator slots 140 is 15. Limiting the number of the stator slots 140 to 15 and limiting the number of the magnet slots 210 to 10 can reduce the production cost of the motor and improve the cost performance of the motor.

[0053] Moreover, the number of stator slots 140 Q=15 can further improve the noise reduction effect and enhance the performance of the compressor. On the one hand, it meets the use requirements of a multi-slot stator core. On the other hand, by improving the structure of the stator slots 140, it is helpful to reduce the additional air gap to enhance the motor performance.

[0054] Optionally, the material of the rotor punching 200 is configured as a soft magnetic material; soft magnetic material can achieve a larger magnetization intensity with a smaller external magnetic field. Soft magnetic material has low coercive force and high magnetic permeability, which is beneficial to reducing the loss of the rotor core formed by stacking multiple rotor punchings 200, that is, reducing the iron loss of the motor, which is beneficial to improving the performance of the motor.

[0055] Optionally, the material of the rotor punching sheet 200 is a silicon steel sheet; the silicon content of silicon steel is 1.0-4.5%, and the silicon alloy steel with a carbon content of less than 0.08% can be called silicon steel. Silicon steel has the characteristics of high magnetic permeability, low coercive force, and large resistivity, so the hysteresis loss and eddy current loss are small. The low iron loss of silicon steel can save a lot of electric energy and extend the working time of the motor and transformer. In addition, the high magnetic induction of silicon steel can reduce the excitation current and save electric energy. The high magnetic induction of silicon steel can increase the maximum magnetic induction when designing the stator core and the rotor core, and at the same time make the rotor core volume smaller and reduce the weight of the rotor core, saving silicon steel, wires, insulation materials and structural materials, etc., which not only reduces the motor loss and manufacturing cost, but also facilitates assembly and transportation. Of course, the present invention is not limited to this. In some other embodiments, the rotor punching sheet 200 can also be made of neodymium iron boron or ferrite or other permanent magnetic materials.

[0056] Furthermore, in one embodiment, the rotor punching sheet 200 and the stator punching sheet 100 can be made of different materials or shapes, so as to meet the requirements of different processing technologies of the stator and the rotor, and to select suitable punching sheets according to the performance requirements of the motor to form the rotor core and the stator core, thereby ensuring good performance of the electrode, and also improving the wide application range of the motor. Of course, the present invention is not limited to this. In some other embodiments, the stator punching sheets 100 stacked into the stator core and the rotor punching sheets 200 stacked into the rotor core are made of the same material, which is conducive to the mass production of punching sheets and reduces manufacturing costs.

[0057] Optionally, the thickness of the rotor punching 200 is d, and the range of d is 0.2mm≤d≤0.35mm; in this way, on the one hand, it can ensure that the rotor and the stator cooperate with each other to generate sufficient induced current for user use; on the other hand, it can avoid the occurrence of large eddy current damage due to the rotor punching 200 being too thick, so as to extend the service life of the motor, and by limiting the plate thickness of the rotor punching 200, on the premise of meeting its functional requirements, avoid unnecessary product materials, reduce production costs, reduce product weight, and enhance user experience.

[0058] Furthermore, in this embodiment, the rotor punching 200 selects a silicon steel plate with a thickness of 0.35 mm. While ensuring that the rotor and the stator cooperate with each other to generate sufficient induced current for users to use, the probability of large eddy current damage caused by the stator punching 100 being too thick is reduced, thereby extending the service life of the motor.

[0059] Furthermore, in one embodiment, the mass percentage of heavy rare earth elements in the permanent magnet is 0, that is, the permanent magnet does not contain heavy rare earth elements, which reduces the consumption of strategic resources, is conducive to the sustainable development of resources, and reduces the manufacturing cost of the motor, which is suitable for promotion and application. It is understandable that the mass percentage of heavy rare earth elements in the permanent magnet can also be other values, for example, the mass percentage of heavy rare earth elements in the permanent magnet is 0.005%, 0.01%, 0.025%, etc. Among them, the heavy rare earth elements can also include other elements that can become components of the permanent magnet.

[0060] Furthermore, in one embodiment, the material used for the permanent magnet may be a neodymium iron boron permanent magnet, which has excellent magnetic properties and can meet the use requirements of the motor. It is understandable that the permanent magnet may also be other permanent magnets that meet the requirements.

[0061] 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 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 described one by one here.

[0062] The present invention also proposes a refrigeration device, which includes a compressor. The specific structure of the compressor refers to the above embodiment. Since the refrigeration device adopts all the technical solutions of all the above embodiments, it at least has all the beneficial effects brought by the technical solutions of the above embodiments, which will not be repeated here one by one.

[0063] 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: The motor includes a stator punching sheet, the stator punching sheet includes an annular stator yoke, a coil, and a plurality of stator teeth, the plurality of stator teeth are arranged at intervals along the circumferential direction of the inner annular surface of the stator yoke to form a stator slot between any two adjacent stator teeth, the stator tooth width is W, the coil is wound around the stator teeth, the conductivity of the coil is σ, the diameter of the coil is φ, and the relationship between W, σ and φ is: (σ / 10 7 )-3.5≤φ≤W / 5.

2. The motor according to claim 1, characterized in that The range of the conductivity σ is: 3×10 7 ≤σ≤4×10 7 .

3. The motor according to claim 1, characterized in that The outer annular surface of the stator punching sheet is provided with a plurality of grooves.

4. The motor according to claim 1, characterized in that The motor further comprises a rotor punching sheet, wherein the rotor punching sheet is provided with a plurality of magnet slots, and the magnet slots are configured as V-shaped slots, U-shaped slots, W-shaped slots, straight-shaped slots or I-shaped slots.

5. The motor according to claim 4, characterized in that The number of the magnet slots is 10, and the number of the stator slots is 15.

6. The motor according to claim 4, characterized in that The rotor punching sheet is made of soft magnetic material.

7. The motor according to claim 6, characterized in that The material configuration of the rotor punching sheet is silicon steel sheet.

8. The motor according to claim 4, characterized in that The thickness of the rotor punching sheet is d, and the range of d is 0.2mm≤d≤0.35mm.

9. A compressor, characterized in that: Comprising the motor according to any one of claims 1 to 8.

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

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