Electric machine, compressor and refrigeration plant

Abstract

This utility model discloses an electric motor, a compressor, and a refrigeration device, relating to the field of permanent magnet motor technology. The motor includes a stator and a rotor. The stator includes a stator core and windings. The stator core is formed by stacking multiple stator silicon steel sheets. Each stator silicon steel sheet includes a stator yoke and multiple stator teeth spaced along the inner circumference of the stator yoke. Two adjacent stator teeth and the stator yoke form a stator slot. The height of the stator core is L, the number of stator silicon steel sheets is X, the inner diameter of the stator core is D, the number of stator slots is Q, and the number of conductors in the windings within a stator slot is N. The rotor includes a rotor core and multiple magnets. The rotor core has multiple magnet slots arranged circumferentially, and magnets are installed in the magnet slots. The following conditions are met: 0.13 < 1000 × L / X < 0.3, 2 < 19.8 / (D × L × N × Q) < 3, where L and D are in meters (m). The technical solution provided by this utility model ensures that the motor has high overload capacity while improving the motor efficiency under light load conditions, thereby improving the motor's energy efficiency.

Description

Technical Field

[0001] This utility model relates to the field of permanent magnet motor technology, and in particular to a motor, compressor and refrigeration equipment. Background Technology

[0002] With increasing energy-saving requirements in the air conditioning industry, the energy efficiency requirements for compressor motors are becoming increasingly stringent. Currently, when the motor is under light load, iron loss accounts for a large proportion of its energy consumption. Improving motor efficiency requires reducing iron loss, which typically involves reducing the motor's magnetic load, height, and the use of thinner silicon steel materials. However, improving the motor's overload capacity requires increasing its height and magnetic load. This creates a contradiction between the methods used to improve motor efficiency under light load and high overload conditions, which is detrimental to improving the motor's overall energy efficiency. Utility Model Content

[0003] The main purpose of this utility model is to propose a motor, compressor, and refrigeration equipment, which aims to improve the efficiency of the motor under light load conditions while ensuring that the motor has a high overload capacity, thereby improving the energy efficiency of the motor.

[0004] To achieve the above objectives, the motor proposed in this utility model includes:

[0005] A stator, comprising a stator core and windings, wherein the stator core is formed by stacking multiple stator silicon steel sheets, each stator silicon steel sheet comprising a stator yoke and multiple stator teeth spaced apart along the inner circumference of the stator yoke, two adjacent stator teeth and the stator yoke forming a stator slot, the stator core having a height of L, the number of stator silicon steel sheets being X, the inner diameter of the stator core being D, the number of stator slots being Q, and the number of conductors in one stator slot being N; and

[0006] The rotor includes a rotor core and multiple magnets. The rotor core is formed by stacking multiple rotor silicon steel sheets. The rotor core has multiple magnet slots arranged circumferentially, and the magnets are installed in the magnet slots.

[0007] satisfy: , , where the units for L and D are meters.

[0008] In one embodiment, the stator teeth have a circumferential width of Ht, and the stator yoke has a radial width of Hy, satisfying: , where the units for Ht and Hy are meters.

[0009] In one embodiment, the outer diameter of the stator silicon steel sheet is φ, and the thickness of the magnet is h, where φ and h are in meters (m), satisfying the following: .

[0010] In one embodiment, the thickness of the magnet is h, where h is in meters, and satisfies: .

[0011] In one embodiment, the outer diameter of the stator silicon steel sheet is φ, where φ is in meters (m), and satisfies: .

[0012] In one embodiment, the rotor has p pole pairs, satisfying: , , .

[0013] In one embodiment, a plurality of the stator silicon steel sheets are stacked to form the stator core by at least one of riveting, welding, or gluing.

[0014] In one embodiment, the rotor silicon steel sheets are stacked by riveting to form the rotor core.

[0015] In one embodiment, the thickness of the rotor silicon steel sheet is greater than or equal to the thickness of the stator silicon steel sheet.

[0016] In one embodiment, the winding is made of enameled wire.

[0017] This utility model also proposes a compressor, which includes a motor as described above.

[0018] This utility model also proposes a refrigeration device, which includes a compressor as described above.

[0019] The technical solution of this utility model achieves a balance between the feasibility of manufacturing stator silicon steel sheets and reducing eddy current losses by limiting the effective thickness of a single silicon steel sheet to between 0.13mm and 0.3mm. Simultaneously, by restricting the product of the stator core inner diameter D, the axial height L of the stator core, the number of conductors per stator slot N, and the number of stator slots Q, it ensures a reasonable match between the motor's power output, winding arrangement, and magnetic circuit design, avoiding efficiency reduction or magnetic circuit saturation due to parameter imbalance. Thus, under the constraints of the above formulas, the use of thin silicon steel sheets combined with a low magnetic load design reduces motor iron losses, ensures mechanical strength, improves magnetic field distribution, reduces tooth saturation and harmonic losses, and keeps the magnetic flux density within an optimal range. This improves efficiency under light load conditions while ensuring output capacity under high overload conditions, thereby balancing motor output capacity, copper losses, and efficiency, enabling the motor to achieve efficient, energy-saving, and stable operation across the entire load range, and ultimately improving motor energy efficiency. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0021] Figure 1 A schematic diagram of the structure of an embodiment of the motor provided by this utility model;

[0022] Figure 2 for Figure 1 A magnified view of a section at point A in the middle;

[0023] Figure 3 for Figure 1 A cross-sectional view of the motor;

[0024] Figure 4 A comparison chart of the efficiency of the motor provided by this utility model and existing motors;

[0025] Figure 5 A comparison diagram of loss separation between the motor provided by this utility model and existing motors;

[0026] Figure 6 A comparison diagram of the overload capacity of the motor provided by this utility model and existing motors.

[0027] Explanation of icon numbers:

[0028] 100. Stator; 110. Stator core; 111. Stator silicon steel sheet; 112. Stator yoke; 113. Stator tooth; 114. Stator slot; 120. Winding; 200. Rotor; 210. Rotor core; 211. Rotor silicon steel sheet; 212. Magnet slot; 220. Magnet.

[0029] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0030] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model.

[0031] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0032] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0033] With increasingly stringent energy efficiency requirements for air conditioning compressor motors, a key challenge in motor design is how to reduce iron losses to improve efficiency under light load conditions while ensuring sufficient output capacity under high load or overload conditions. Current technologies typically employ measures such as reducing magnetic load, decreasing motor height, and using thinner silicon steel sheets to reduce iron losses under light loads. Conversely, enhancing overload capacity often involves increasing motor height and magnetic load. These conflicting design approaches make it difficult to achieve high energy efficiency across the entire load range.

[0034] This utility model proposes an electric motor.

[0035] Please refer to Figure 1 , Figures 4 to 6 In one embodiment of this utility model, the motor includes:

[0036] The stator 100 includes a stator core 110 and a winding 120. The stator core 110 is formed by stacking multiple stator silicon steel sheets 111. Each stator silicon steel sheet 111 includes a stator yoke 112 and multiple stator teeth 113 spaced along the inner circumference of the stator yoke 112. Two adjacent stator teeth 113 and the stator yoke 112 form a stator slot 114. The height of the stator core 110 is L, the number of stator silicon steel sheets 111 is X, the inner diameter of the stator core 110 is D, the number of stator slots 114 is Q, and the number of conductors in the winding 120 within a stator slot 114 is N.

[0037] Rotor 200 includes rotor core 210 and multiple magnets 220. Rotor core 210 is formed by stacking multiple rotor silicon steel sheets 212. Rotor core 210 has multiple magnet slots 212 arranged circumferentially, and magnets 220 are installed in the magnet slots 212.

[0038] satisfy: , , where the units for L and D are meters.

[0039] The technical solution of this utility model achieves a balance between the feasibility of manufacturing stator silicon steel sheets 111 and reducing eddy current losses by constraining the effective thickness of a single silicon steel sheet to between 0.13mm and 0.3mm. At the same time, by limiting the product of the inner diameter D of the stator core 110, the axial height L of the stator core 110, the number of conductors per slot N of the stator slot 114, and the number of slots Q of the stator slot 114, it ensures that the motor achieves a reasonable match in terms of power output, winding 120 arrangement, and magnetic circuit design, and avoids efficiency reduction or magnetic circuit saturation due to parameter imbalance. Thus, under the constraints of the above formula, using thin silicon steel sheets with a low magnetic load design can reduce motor iron loss, ensure mechanical strength, improve magnetic field distribution, reduce tooth saturation and harmonic losses, and keep the magnetic flux density always within an optimal range. This improves efficiency under light load conditions and ensures output capacity under high overload conditions, thereby balancing motor output capacity, copper loss and efficiency, enabling the motor to achieve efficient, energy-saving and stable operation across the entire load range, and further improving motor energy efficiency.

[0040] It should be noted that, please refer to Figures 4 to 6 In this embodiment, the motor achieves an efficiency of 94.1% at 1800 RPM, with copper losses of 7.3W and iron losses of 12W. At the same speed, the efficiency of existing motors is 93.7%, with copper losses of 7.7W and iron losses of 12.3W. At 3600 RPM, the motor achieves an efficiency of 95.7%, with copper losses of 12.6W and iron losses of 19.5W. At the same speed, the efficiency of existing motors is 95.2%, with copper losses of 13.3W and iron losses of 23.8W. It is evident that the motor's efficiency is higher than that of existing motors at different speeds, and the iron and copper losses are also lower. Furthermore, during high overload capacity testing, the motor in this embodiment can output a maximum torque of 4.85 N·m at approximately 11 amp-current, while existing motors can only output a maximum torque of 4.37 N·m at approximately 10 amp-current. Thus, this embodiment can ensure the high overload capacity of the motor and improve the motor efficiency under light load conditions. The motors in the prior art are those whose dimensions are not specified in the above formula.

[0041] In addition, the stator core 110 has a through-hole mounting hole, which is formed by multiple stator teeth 113 near the center of the stator core 110. The rotor 200 is rotatably inserted into the mounting hole. The inner diameter D of the stator core 110 is the maximum diameter of the mounting hole. The height of the stator core 110 is its axial length in the motor. The number of conductors in the winding 120 within a stator slot 114 is the number of conductors per slot, which can be understood as the number of windings 120 wires in each stator slot 114. Possible values ​​are: 0.14, 0.16, 0.19, 0.20, 0.23, 0.25, 0.27, or 0.29, etc. Possible values ​​include: 2.01, 2.1, 2.16, 2.24, 2.30, 2.35, 2.40, 2.44, 2.48, 2.50, 2.56, 2.60, 2.63, 2.68, 2.70, 2.75, 2.79, 2.80, 2.83, 2.88, 2.90, 2.92, 2.96, or 2.99, etc. The range of formulas described in this implementation plan is limited to values ​​within specified units. The units within the resulting numerical range can be reasonably estimated and calculated, such as: For mm.

[0042] In one embodiment, please refer to Figure 1 and Figure 2 The stator tooth 113 has a circumferential width of Ht, and the stator yoke 112 has a radial width of Hy, satisfying: Where Ht and Hy are in meters (m). It should be noted that the circumferential width of the stator teeth 113 is the distance between the parallel intervals on both sides of the circumferentially distributed stator teeth 113. This interval is from the protruding position of the stator teeth 113 at the slot opening of the stator slot 114 to the position of the stator yoke 112, representing the waist position of the stator teeth 113. The radial width of the stator yoke 112 is the distance between the circumference enclosed by the bottom edges of the multiple stator slots 114 and the circumference enclosed by the stator silicon steel sheet 111 along the radial direction corresponding to the outer periphery of the stator slot 114. The position of this value needs to avoid... Figure 1 or Figure 2 The groove on the outer periphery of the 111 silicon steel sheet of the middle stator.

[0043] It is understandable that the above-mentioned proportional relationship has a significant impact on the motor's magnetic circuit distribution, magnetic flux density control, and overall energy efficiency. By limiting the ratio of stator yoke 112 width Hy to stator tooth 113 width Ht within a reasonable range, an optimized balance in the magnetic circuit design is achieved: on the one hand, when... If the magnetic flux density is too small (i.e., the stator teeth 113 are too wide), it will lead to excessively high magnetic flux density in the stator yoke 112, which can easily cause local saturation, increase iron losses, and affect motor efficiency; on the other hand, if If the ratio is too large (i.e., the stator teeth 113 are too narrow), the magnetic flux density in the stator teeth 113 will increase, which will also cause saturation and limit the motor's output capacity under high load. Therefore, setting this ratio between 0.79 and 1.15 helps to make the magnetic flux density distribution of the stator teeth 113 and the yoke more uniform, avoiding local magnetic saturation, thereby reducing iron loss and improving efficiency under light load conditions, and maintaining stable electromagnetic performance and output torque under high load conditions. In addition, the optimization of the above structural parameters in this embodiment can also work in conjunction with other design methods, such as combining high-performance silicon steel materials to further reduce iron loss. In summary, Properly controlling the ratio improves the motor's efficiency across the entire load range, effectively resolving the design conflict between light-load efficiency and overload capacity, and helping the air conditioning compressor motor achieve a higher level of overall energy efficiency. Among these, Possible values ​​are: 0.80, 0.85, 0.92, 0.96, 1.00, 1.04, 1.08, 1.10, or 1.14, etc.

[0044] In one embodiment, please refer to Figure 1 and Figure 2 The outer diameter of the stator silicon steel sheet 111 is φ, and the thickness of the magnet 220 is h, where φ and h are in meters (m). The following conditions must be met: It should be noted that the thickness of magnet 220 is determined as follows: magnet 220 is arranged in a cuboid shape, representing a thickness value based on general structural concepts. Furthermore, in the arrangement of the rotor core 210, the larger side of magnet 220 is opposite or inclined to the center or outer periphery of the rotor core 210. The values ​​of φ and D represent the maximum outer and inner diameters of the stator silicon steel sheets 111. It can be understood that by limiting the thickness of magnet 220 to the overall dimensions and number of slots of the motor through the above formulas, control over the air gap magnetic field strength, magnetic reluctance distribution, and electromagnetic torque output is achieved. By optimizing the magnetic circuit contribution of magnet 220, sufficient magnetomotive force is ensured to maintain high output torque while avoiding magnetic flux saturation and increased eddy current losses due to excessive magnet 220 thickness, or severe magnetic leakage, weakened magnetic field, and reduced efficiency due to excessively thin magnet 220.

[0045] It should be noted that when When the value is less than 0.155, it means that the 220mm magnet is too thin or the ratio of slot number to inner diameter is unreasonable, which may lead to insufficient air gap magnetic flux density and affect the motor's output capacity under high load; while when... When the value exceeds 0.168, it indicates that the 220 magnet is too thick or that the number of slots is mismatched with the inner diameter, which can easily cause local saturation of the magnetic circuit, increase iron loss, and affect light-load efficiency. Therefore, Limiting the value to between 0.155 and 0.168 helps maximize the utilization efficiency of the magnet 220 material, ensuring that the motor maintains good electromagnetic performance under different load conditions. Additionally, it allows for structural optimization with the stator 100 (such as...). The synergistic effect of matching and the application of high-performance silicon steel materials precisely controls the matching relationship between the thickness of the 220 magnet and the overall parameters of the motor. This not only improves the efficiency of the motor under light load conditions but also ensures its stable output capability under high load or overload conditions. The possible values ​​are: 0.155, 0.157, 0.158, 0.160, 0.161, 0.163, 0.165, or 0.168, etc.

[0046] Furthermore, in this embodiment, please continue to refer to... Figure 1 and Figure 2 h is limited: The unit of h is meters (m). It can be understood that limiting the thickness of magnet 220 to between 0.0013m and 0.002m achieves a reasonable balance between air gap magnetic field strength, magnetic circuit saturation, and electromagnetic torque output. Magnet 220 with a thickness within this range balances the motor's magnetomotive force supply capability and loss control requirements. If the thickness of magnet 220 is too small... If the air gap magnetic flux density is too low, it can easily lead to insufficient magnetic flux density, weakening the motor's output capacity under high load and affecting its overload performance; conversely, if the thickness of the 220mm magnet is too large, Excessive thickness of the magnet 220 can lead to local saturation of the magnetic circuit, increasing iron losses and eddy current losses, and significantly reducing motor efficiency, especially under light load conditions. Therefore, controlling the thickness of the magnet 220 between 0.0013m and 0.002m helps to ensure sufficient magnetic flux supply to maintain efficient electromagnetic conversion while avoiding nonlinear magnetic saturation effects and additional losses caused by excessive thickness of the magnet 220. The value of h can be 0.0013, 0.0015, 0.0016, 0.0018, or 0.002, etc.

[0047] In one embodiment, please refer to Figure 1 The outer diameter of the stator silicon steel sheet 111 is φ, where φ is in meters (m), and it satisfies the following: It can be understood that the above formula, through reasonable control of the overall geometric dimensions of the stator core 110, achieves an optimized balance between magnetic circuit distribution, material utilization, and electromagnetic performance. When When the value is less than 0.55, it means that the inner diameter of stator 100 is too small or the outer diameter is too large, which may lead to insufficient cross-sectional area of ​​stator yoke 112, resulting in excessively high magnetic flux density, increased iron loss, and limiting the motor's output capacity under high load; while when When the value is greater than 0.63, the area of ​​stator slot 114 may be too small, affecting the arrangement and heat dissipation performance of winding 120, thereby increasing copper loss and reducing overall efficiency. Therefore, Maintaining the value within the range of 0.55 to 0.63 helps achieve a uniform distribution of the stator 100 magnetic circuit, improving the motor's operational stability and energy efficiency under different load conditions. The possible values ​​are: 0.55, 0.57, 0.58, 0.60, 0.61, or 0.63, etc.

[0048] In one embodiment, please refer to Figure 1 The rotor 200 has p pole pairs, satisfying: , , It is understandable that by designing the motor's pole-slot ratio, optimized control is achieved over cogging torque fluctuations, magnetomotive force harmonic content, and electromagnetic output stability. This results in a more uniform air gap magnetic field distribution during motor operation, reducing additional losses and vibration noise caused by harmonics, thereby improving overall efficiency and operational stability. Specifically, when... At this time, the motor possesses good winding symmetry and low cogging torque, which helps reduce iron losses and improve efficiency under light load conditions; simultaneously, it maintains high output torque density and electromagnetic performance under heavy load or overload conditions. Furthermore, limiting the number of pole pairs p to between 2 and 6, and controlling the number of slots Q to between 6 and 8, not only ensures the compactness of the motor structure and the feasibility of manufacturing processes, but also facilitates efficient operation over a wide load range. The value of p can be 2, 4, or 6, and the corresponding value of Q can be 6, 12, or 18.

[0049] Regarding the method of stacking stator silicon steel sheets 111 to form stator core 110, in one embodiment, please refer to... Figure 1 and Figure 3 Multiple stator silicon steel sheets 111 are stacked to form a stator core 110 through at least one of the following methods: riveting, welding, or gluing. It can be understood that stacking the stator silicon steel sheets 111 to form the stator core 110, while ensuring the mechanical strength and structural stability of the stator core 110, improves the overall energy efficiency and operational reliability of the motor. It reduces problems such as interlayer loosening and uneven magnetic resistance that may occur during the stacking process, thereby improving the continuity and uniformity of the magnetic circuit and reducing the increase in iron loss caused by localized magnetic flux concentration. Specifically, under light load operation, a uniform magnetic circuit distribution helps reduce unnecessary losses and improve overall efficiency; while under heavy load or overload conditions, a stable stator core 110 can effectively prevent deformation or magnetic saturation, ensuring the stable performance of the motor's output capacity. Furthermore, using riveting, welding, or gluing methods can also improve production efficiency, simplify the assembly process, and facilitate mass production and cost control.

[0050] In one embodiment, the rotor silicon steel sheets 212 are stacked to form the rotor core 210 by riveting. This method ensures mechanical strength and stability while improving the continuity of the magnetic circuit and the overall operating efficiency of the motor. It avoids problems such as interlayer loosening and misalignment that may occur during the stacking process, thereby reducing local magnetic flux concentration and eddy current losses caused by uneven magnetic circuits. This is especially beneficial in light-load operation, helping to reduce iron losses and improve energy efficiency. Simultaneously, under high-load or overload conditions, a stable rotor core 210 can effectively prevent deformation or magnetic saturation caused by increased electromagnetic force, ensuring the stability and reliability of the motor's output torque. Furthermore, the riveting process has advantages such as simple operation, controllable cost, and suitability for mass production, which helps improve motor manufacturing efficiency and consistency. Of course, in other embodiments, the rotor silicon steel sheets 212 can also be stacked by welding or gluing to form the rotor core 210.

[0051] In one embodiment, please refer to Figure 3 The thickness of the rotor silicon steel sheet 212 is greater than or equal to the thickness of the stator silicon steel sheet 111. It should be noted that because the rotor 200 is subjected to significant centrifugal force and alternating magnetic field during operation, if the rotor silicon steel sheet 212 is too thin, it is not only prone to structural deformation but may also cause local saturation due to excessive magnetic flux density, increasing iron losses and affecting output torque. The stator core 110, on the other hand, focuses more on good magnetic permeability and the heat dissipation capacity of the winding 120. Using a relatively thinner stator silicon steel sheet 111 helps reduce eddy current losses and improve efficiency under light loads. Therefore, designing the rotor silicon steel sheet 212 to be the same thickness as or thicker than the stator silicon steel sheet 111 can effectively enhance the structural stability and anti-saturation capability of the rotor core 210 without sacrificing the overall efficiency of the motor, especially ensuring the continuous output performance of the motor under high load or overload operation. Thus, by ensuring the efficient response capability of the stator core 110 magnetic circuit while improving the mechanical strength and magnetic flux carrying capacity of the rotor core 210, the overall electromagnetic performance and energy efficiency of the motor are optimized in a coordinated manner. Of course, in other embodiments, the thickness of the rotor silicon steel sheet 212 can also be appropriately smaller than the thickness of the stator silicon steel sheet 111.

[0052] In one embodiment, the winding 120 is made of enameled wire. It should be noted that enameled wire has high conductivity and a thin insulation layer, enabling a higher slot fill factor within the limited area of ​​the stator slots 114, reducing the resistance of the winding 120 and decreasing copper losses. This helps improve motor efficiency under light load conditions. Simultaneously, its good flexibility and flexibility facilitate complex winding structure designs, meeting the high-performance electromagnetic matching requirements under different pole-slot combinations. Furthermore, enameled wire possesses excellent heat resistance and corrosion resistance, effectively resisting the effects of high temperature and humidity during long-term motor operation, improving the lifespan of the winding 120 and system reliability, especially ensuring stable motor output performance under heavy load or frequent start-stop conditions. Therefore, selecting enameled wire with good conductivity and insulation properties as the winding 120 material ensures the motor's efficient electromagnetic conversion capability while also considering the thermal stability, space utilization, and manufacturability of the winding 120, thereby achieving a synergistic improvement in the overall energy efficiency and operational reliability of the motor.

[0053] This utility model also proposes a compressor, which includes a motor. The specific structure of the motor is as described in the above embodiments. Since this compressor adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, and will not be described in detail here. It should be noted that in this embodiment, the motor housing is the compressor housing, the outer periphery of the stator core is connected to the housing by welding, the motor is located in the compressor cavity, and the rotor core has flow holes for circulating the refrigerant oil and refrigerant in the compressor cavity. Of course, in other embodiments, the motor housing and the compressor housing can also be set independently.

[0054] This utility model also proposes a refrigeration device, which includes a compressor. The specific structure of the compressor is as described in the above embodiments. Since this refrigeration device adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here. The refrigeration device can be configured as an air conditioner or a refrigerator.

[0055] The above description is merely an exemplary embodiment of the present utility model and does not limit the scope of protection of the present utility model. Any equivalent structural transformations made based on the technical concept of the present utility model and the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the scope of protection of the present utility model.

Claims

1. An electric machine characterized in that, include: A stator, comprising a stator core and windings, wherein the stator core is formed by stacking multiple stator silicon steel sheets, each stator silicon steel sheet comprising a stator yoke and multiple stator teeth spaced apart along the inner circumference of the stator yoke, two adjacent stator teeth and the stator yoke forming a stator slot, the stator core having a height of L, the number of stator silicon steel sheets being X, the inner diameter of the stator core being D, the number of stator slots being Q, and the number of conductors in one stator slot being N; and The rotor includes a rotor core and multiple magnets. The rotor core is formed by stacking multiple rotor silicon steel sheets. The rotor core has multiple magnet slots arranged circumferentially, and the magnets are installed in the magnet slots. Satisfies: , where L and D are in m.

2. The electric machine of claim 1, wherein, The width of the stator tooth in the circumferential direction is Ht, and the width of the stator yoke in the radial direction is Hy, satisfying: wherein Ht and Hy are in units of m.

3. The electric machine of claim 1, wherein, The outer diameter of the stator silicon steel sheet is φ, the thickness of the magnetic steel is h, φ and h are in units of m, and the following is satisfied: .

4. The electric machine of claim 1, wherein, The thickness of the magnetic steel is h, the unit of h is m, and the following is met: .

5. The electric machine of claim 1, wherein, The outer diameter of the stator silicon steel sheet is φ, φ is in m, and satisfies: .

6. The electric machine of claim 1, wherein, The rotor has p pole pairs, satisfying: , , .

7. The electric machine of any one of claims 1 to 6, wherein, The stator silicon steel sheets are stacked together by at least one of riveting, welding, or gluing to form the stator core; And / or, the rotor silicon steel sheets are stacked by riveting to form the rotor core.

8. The electric machine of any one of claims 1 to 6, wherein, The thickness of the rotor silicon steel sheet is greater than or equal to the thickness of the stator silicon steel sheet; And / or, the winding is made of enameled wire.

9. A compressor characterized by, Includes the motor as described in any one of claims 1 to 8.

10. A refrigeration appliance characterized in that, Includes the compressor as described in claim 9.

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