Electric machine, compressor and refrigeration plant

Abstract

The application discloses a motor, a compressor and a refrigeration device, and relates to the technical field of permanent magnet motors, wherein the motor comprises a winding and a stator core, the winding is arranged on the stator core, the stator core comprises a yoke part and a plurality of tooth parts distributed on the inner periphery of the yoke part, the maximum inner diameter of the stator core is D1, the maximum outer diameter of the stator core is D2, and the area enclosed by a circle formed by the maximum outer diameter of the stator core and the outer periphery of the stator core is S; and the following conditions are met: 0.8 < D1 / D2 < 1.2, and S > 0.5*D1*D2, wherein the units of D1 and D2 are mm, and the unit of S is mm. 2 The technical scheme provided by the application aims to balance the oil discharge rate of the compressor and the efficiency of the motor, and guarantee the energy efficiency of the compressor.

Description

Technical Field

[0001] This invention relates to the field of permanent magnet motor technology, and particularly to a motor, compressor, and refrigeration equipment. Background Technology

[0002] With the increasing demands on the energy efficiency ratio of compressors, key indicators such as oil level and motor efficiency have received considerable attention. In related technologies, the stator core of the motor is usually trimmed to reduce the oil level and thus reduce the oil discharge rate. However, this can easily lead to rapid magnetic saturation of the stator core, reducing motor efficiency and affecting compressor energy efficiency. Summary of the Invention

[0003] The main objective of this invention is to provide a motor, compressor, and refrigeration equipment that balances the oil discharge rate of the compressor and the efficiency of the motor to ensure the energy efficiency of the compressor.

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

[0005] Windings; and

[0006] The stator core, wherein the winding is disposed on the stator core, the stator core includes a yoke and a plurality of teeth distributed on the inner periphery of the yoke, the maximum inner diameter of the stator core is D1, the maximum outer diameter of the stator core is D2, and the area enclosed by the circle formed by the maximum outer diameter of the stator core and the outer periphery of the stator core is S.

[0007] satisfy: Where D1 and D2 are in mm, and S is in mm. 2 .

[0008] In one embodiment, the maximum radial width of the yoke in the stator core is H1, and the minimum radial width of the yoke in the stator core is H2, satisfying: The units for H1 and H2 are mm.

[0009] In one implementation, .

[0010] In one embodiment, the width of the tooth in the circumferential direction of the stator core is W, and the minimum width of the yoke in the radial direction of the stator core is H2, satisfying: The units for W and H2 are mm.

[0011] In one embodiment, the motor further includes an external lead wire and a crimp terminal. The surface of the external lead wire is provided with a first tin layer. The crimp terminal covers the conductor of the winding and the external lead wire. The conductor and the external lead wire are electrically connected through the crimp terminal.

[0012] In one embodiment, the thickness of the first tin layer is δ1, satisfying: .

[0013] In one embodiment, the conductor of the winding is configured as enameled wire, and the inner side of the crimp terminal is provided with protrusions that insert into the enamel coating of the enameled wire and abut against the conductor inside the enameled wire.

[0014] In one embodiment, a second tin layer is provided on the surface of the crimp terminal.

[0015] In one embodiment, the conductor of the winding is made of at least aluminum, and / or at least one of the crimp terminal and the external lead is made of copper.

[0016] The present invention also proposes a compressor, which includes a motor as described above.

[0017] The present invention also proposes a refrigeration device, which includes a compressor as described above.

[0018] The technical solution of this invention controls The numerical range is between 0.036 and 0.054, reflecting the proportional relationship between the area of ​​the stator core's tangential region and the overall radial cross-sectional area of ​​the stator core. The ratio represents the total cross-sectional area of ​​the stator core, and S represents the total area of ​​the flow holes formed by the tangential edges of the stator core for lubricating oil return. Limiting this ratio to between 0.036 and 0.054 achieves a balance between the degree of tangential cutting and the radial thickness of the stator core. When this ratio is less than 0.036, it indicates that the tangential area is too small, retaining too much material on the outer periphery of the stator core. This results in an insufficient gap between the stator core and the inner wall of the compressor housing, hindering the return path of lubricating oil from the upper chamber of the compressor to the lower chamber of the motor. This increases the amount of oil discharged from the compressor, reducing lubrication efficiency and potentially causing oil carryover in the exhaust, affecting the heat exchange performance of the refrigeration system. Conversely, if the ratio is greater than 0.054, it indicates excessive tangential cutting, leading to a reduction in the radial thickness of the stator core, especially a significant reduction in the radial thickness of the yoke. This increases the magnetic flux density, making the stator core prone to saturation, increasing iron losses, decreasing motor efficiency, and weakening mechanical strength, potentially causing vibration and noise problems. When... When controlled within the range of 0.036 to 0.054, it ensures that the stator core has sufficient magnetic cross-sectional area to maintain efficient electromagnetic conversion, reduces iron loss under no-load and load conditions, and improves the overall efficiency of the motor. At the same time, it reasonably releases the space between the outer periphery of the stator core and the casing, forming a smooth oil-gas return channel, effectively reducing the amount of oil discharged, improving the uniformity and reliability of internal lubrication of the compressor, thereby balancing the oil discharge rate of the compressor and the efficiency of the motor, and ensuring the energy efficiency of the compressor. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of the present invention 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 the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0020] Figure 1 A schematic diagram of the structure of an embodiment of the stator of the electric motor provided by the present invention;

[0021] Figure 2 for Figure 1 Schematic diagram of the middle stator core;

[0022] Figure 3 for Figure 2 A magnified view of a section at point A in the middle;

[0023] Figure 4 for Figure 1 Schematic diagram of the structure of the external lead-out wire;

[0024] Figure 5 for Figure 1 Schematic diagram of the structure of the medium-pressure terminal block;

[0025] Figure 6 for Figure 1 A schematic diagram of the structure of the intermediate winding conductor, external lead wire and crimp terminal;

[0026] Figure 7 A graph showing the relationship between the efficiency of the motor and the oil discharge rate of the compressor, provided for the present invention;

[0027] Figure 8 A graph showing the relationship between motor efficiency and yoke thickness provided for this invention;

[0028] Figure 9 A graph showing the relationship between current and temperature rise at the crimped terminals of existing motors and the motor provided by this invention.

[0029] Figure 10 This is a schematic diagram showing the change in resistance at the crimped terminals of an existing motor and the motor provided by this invention.

[0030] Explanation of icon numbers:

[0031] 100, Stator core; 110, Yoke; 120, Tooth; 130, Stator slot; 200, Winding; 210, Enamelled wire; 300, External lead; 400, Crimped terminal; 410, Raised tooth.

[0032] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0033] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0034] It should be noted that if the embodiments of the present invention 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.

[0035] Furthermore, if the embodiments of this invention 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. Thus, 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 invention.

[0036] This invention proposes an electric motor.

[0037] Please refer to Figures 1 to 3 , Figure 7 In one embodiment of the present invention, the motor includes:

[0038] Winding 200; and

[0039] A stator core 100 is provided with a winding 200. The stator core 100 includes a yoke 110 and a plurality of teeth 120 distributed on the inner circumference of the yoke 110. The maximum inner diameter of the stator core 100 is D1, the maximum outer diameter of the stator core 100 is D2, and the area enclosed by the circle formed by the maximum outer diameter of the stator core 100 and the outer periphery of the stator core 100 is S.

[0040] satisfy: Where D1 and D2 are in mm, and S is in mm. 2 .

[0041] The technical solution of this invention controls The numerical range is between 0.036 and 0.054, reflecting the proportional relationship between the area of ​​the tangent region of the stator core 100 and the overall radial cross-sectional area of ​​the stator core 100. The ratio represents the total cross-sectional area of ​​the stator core 100, and S represents the total area of ​​the flow holes formed by the tangent edges of the stator core 100 for the return of lubricating oil. By limiting this ratio to the range of 0.036 to 0.054, a balance is achieved between the degree of tangent edges and the radial thickness of the stator core 100. When the ratio is less than 0.036, it indicates that the tangential area is too small, and too much material is retained on the outer periphery of the stator core 100. This results in an insufficient gap between the stator core and the inner wall of the compressor housing, hindering the return path of lubricating oil from the upper chamber of the compressor to the lower chamber of the motor. This increases the amount of oil discharged by the compressor, reducing lubrication efficiency and potentially causing oil carryover in the exhaust, affecting the heat exchange performance of the refrigeration system. Conversely, if the ratio is greater than 0.054, it indicates excessive tangential cutting, leading to a reduction in the radial thickness of the stator core 100, especially a significant reduction in the radial thickness of the yoke 110. This increases the magnetic flux density, making the stator core 100 prone to saturation, increasing iron losses, decreasing motor efficiency, and weakening mechanical strength, potentially causing vibration and noise problems. When controlled within the range of 0.036 to 0.054, it ensures that the stator core 100 has sufficient magnetic cross-sectional area to maintain efficient electromagnetic conversion, reduces iron loss under no-load and load conditions, and improves the overall efficiency of the motor. At the same time, it reasonably releases the space between the outer periphery of the stator core 100 and the casing, forming a smooth oil-gas return channel, effectively reducing the amount of oil discharged, improving the uniformity and reliability of internal lubrication of the compressor, thereby balancing the oil discharge rate of the compressor and the efficiency of the motor, and ensuring the energy efficiency of the compressor.

[0042] It should be noted that S is calculated as the total area of ​​the gap between the outer periphery of the stator core 100 and the compressor housing after the stator core 100 is installed inside the compressor housing. Regarding For the range of values, please refer to [reference]. Figure 7 ,exist When the value is between 0.03 and 0.036, the compressor's oil discharge decreases sharply, and the oil discharge rate drops to 0.5%; When the value is between 0.036 and 0.054, the compressor's oil discharge volume decreases slightly, while the oil discharge rate remains at a low level of 0.5% to 0.4%. Simultaneously, although the motor efficiency decreases slightly, the rate of change is very low, remaining within a suitable range of 80% to 81%. When the value of is greater than 0.054, the motor efficiency decreases sharply, rapidly dropping from around 80% to 78% and continuing to decline. Therefore, the limit is... The oil discharge rate of the compressor is kept in the decreasing range between 0.036 and 0.054, while ensuring the efficiency of the motor.

[0043] In one embodiment, please refer to Figure 2 , Figure 3 and Figure 8 The maximum width of the yoke 110 in the radial direction of the stator core 100 is H1, and the minimum width of the yoke 110 in the radial direction of the stator core 100 is H2, satisfying: The units of H1 and H2 are mm. It can be understood that the stator core 100 has a chamfered outer periphery, and the yoke 110 of the stator core 100 has a non-uniform width distribution in the radial direction, with a maximum width of H1 and a minimum width of H2. When the stator core 100 is chamfered to form a polygonal structure, the width of the yoke 110 at the chamfered position decreases. If H2 / H1 is too small, meaning the minimum width H2 is too narrow relative to the maximum width H1, the magnetic flux density in the chamfered area is too high, leading to local magnetic saturation, concentrated eddy current losses, increased iron losses, and temperature rise, affecting motor efficiency and long-term operational reliability. Conversely, if H2 / H1 is too large, it means the chamfering amount is insufficient, and the yoke 110 is generally too thick. While this is beneficial for magnetic conduction, it compresses the oil-gas return space between the stator periphery and the housing, restricting the smooth return of lubricating oil and causing an increase in oil discharge. Thus, by setting the ratio of the minimum width H2 to the maximum width H1 between 0.77 and 0.84, it is ensured that the cut edge area still has a sufficient and uniform magnetic cross section, making the magnetic flux distribution smooth and avoiding the formation of local high-density areas, effectively reducing core loss and improving motor efficiency. At the same time, it also takes into account the need for the release of the outer peripheral clearance, providing sufficient flow area for lubricating oil. Therefore, without sacrificing electromagnetic performance, it improves the dynamic balance of the compressor's internal lubrication system and achieves stable operation with high efficiency and low oil loss.

[0044] Please refer to Figure 8When H2 / H1 is 0.72, the motor efficiency is 80%; when H2 / H1 is 0.74, the motor efficiency is 80.5%; when H2 / H1 is 0.76, the motor efficiency is 80.9%; when H2 / H1 is 0.77, the motor efficiency is 81.1%; when H2 / H1 is 0.78, the motor efficiency is 81.2%; when H2 / H1 is 0.8, the motor efficiency is 81.3%; when H2 / H1 is 0.82, the motor efficiency is 81.2%; and when H2 / H1 is 0.84, the motor efficiency is 81.1%. Thus, limiting H2 / H1 to between 0.77 and 0.84 places the motor efficiency within the peak range of 81.1% to 81.3%. Furthermore, it can be further limited... This is to ensure that the motor efficiency is at a relatively high peak of 81.2% to 81.3%.

[0045] In one embodiment, please refer to Figure 2 and Figure 3 The width of the tooth portion 120 in the circumferential direction of the stator core 100 is W, and the minimum width of the yoke portion 110 in the radial direction of the stator core 100 is H2, satisfying: The units for W and H2 are mm. It should be noted that since tooth 120 is parallel to the outside in the circumferential direction at any point, W represents any width of tooth 120. The width W of tooth 120 directly affects the magnetic flux density, slot leakage flux, and stator slot 130 area. H2, as the radial dimension of the weakest point of yoke 110 after trimming, determines the upper limit of the magnetic permeability of this region of yoke 110. If W / H2 is less than 0.2, tooth 120 is relatively too narrow, and magnetic saturation of tooth 120 is likely to occur under high load conditions, leading to increased magnetic reluctance, increased excitation current, and consequently increased... Increasing copper and iron losses reduces motor efficiency; at the same time, the excessively narrow tooth section 120 weakens the support structure of the winding 200, affecting the winding processability and mechanical reliability; if W / H2 is greater than 0.3, the tooth section 120 is too wide, resulting in a reduction in slot width and an increase in slot leakage reactance. Meanwhile, the area of ​​the stator slot 130 is reduced, and the electromagnetic density is reduced, affecting the motor's starting performance and operating efficiency. Furthermore, it reduces the available space of the yoke section 110 under the same outer diameter, further compressing H2 and exacerbating magnetic flux congestion in the tangential area, which is not conducive to the overall balanced distribution of magnetic flux in the core. By setting W / H2 to be between 0.2 and 0.3, a good magnetic flux matching relationship is formed between the width of the tooth 120 and the minimum yoke 110. This ensures that the tooth 120 has sufficient magnetic cross-sectional area to avoid local saturation, and also ensures that the yoke 110 retains sufficient magnetic circuit carrying capacity after trimming. This achieves a smooth transition and uniform distribution of magnetic flux between the tooth 120 and the yoke 110, effectively reducing iron loss under no-load and load conditions and improving motor efficiency.

[0046] In one embodiment, please refer to Figure 1 , Figures 4 to 6 The motor also includes an external lead wire 300 and a crimp terminal 400. The surface of the external lead wire 300 is provided with a first tin layer. The crimp terminal 400 covers the wires of the winding 200 and the external lead wire 300. The wires and the external lead wire 300 are electrically connected through the crimp terminal 400. It is understood that one end of the external lead 300 is used to connect to an external power source, and the other end is electrically connected to the conductor of the stator winding 200 through a crimp terminal 400. The surface of the external lead 300 is provided with a first tin layer. During the crimping process, the crimp terminal 400 simultaneously covers both the conductor of the winding 200 and the external lead 300, achieving mechanical fixation and electrical conduction through deformation. Thus, by pre-setting a first tin layer on the surface of the external lead 300, the conductive interface quality between the lead and the conductor of the winding 200 is improved. For example, the first tin layer can effectively prevent electrochemical corrosion between the copper lead and the conductor of the winding 200 under long-term operation or high-temperature environments, especially when the conductor of the winding 200 is made of aluminum, enhancing the electrical stability and durability of the connection. The thickness of the first tin layer is set to δ1, satisfying: .

[0047] For a single-phase motor, the crimp terminal 400 covers two wires of the winding 200 and one external lead 300. For a three-phase motor, the crimp terminal 400 covers three wires of the winding 200 and one external lead 300. Here, the diameter of the largest wire of the winding 200 is limited to one to two times the diameter of the smallest wire to ensure the stability of the crimp terminal 400 deformably covering the wires and the external lead 300. In addition, the external lead 300 is formed by multiple copper wires bundled together, limiting the diameter of the winding 200 conductor to be less than or equal to the diameter of the external lead 300. After the crimp terminal 400 covers the external lead 300 and the winding 200 conductor, the copper wires of the external lead 300 can spread out and cover the winding 200 conductor. On the one hand, this ensures the contact surface between the winding 200 conductor and the external lead 300, and on the other hand, it ensures the compactness of the space inside the crimp terminal 400, thereby ensuring the connection stability.

[0048] In one embodiment, please refer to Figure 5 and Figure 6The winding 200 uses enameled wire 210 as its conductor. The inner side of the crimp terminal 400 has protrusions 410 that insert into the enamel coating of the enameled wire 210 and abut against the conductor inside the enameled wire 210. It can be understood that the winding 200 uses enameled wire 210, which is covered with an insulating enamel coating to achieve inter-turn insulation. The inner side of the crimp terminal 400 has multiple circumferentially or radially distributed protrusions 410. During the crimping process, the protrusions 410 penetrate the enamel coating on the surface of the enameled wire 210 under pressure and directly insert into and form a tight mechanical engagement and electrical contact with the metal conductor inside the enameled wire 210, thus achieving electrical continuity from the enameled wire 210 to the crimp terminal 400 to the external lead 300. No additional paint removal process is required before crimping, simplifying the assembly process and improving production efficiency. Simultaneously, the protruding teeth 410 penetrate the paint layer to achieve point or line contact with the conductor, increasing contact pressure and conductive area. This ensures low and stable contact resistance at the crimped joint, avoiding reliability issues such as incomplete connections, overheating, or even open circuits caused by paint film isolation. Furthermore, during the crimping process, the protruding teeth 410 can push paint debris to the sides or embed it inside the terminal, preventing it from remaining at the conductive interface and affecting contact performance, further ensuring long-term connection stability. Of course, in other embodiments, the paint layer of the winding 200 conductor can be removed first, and then the winding 200 conductor and the external lead 300 can be connected using the crimp terminal 400. In this case, the protruding teeth 410 do not need to be provided on the inner side of the crimp terminal 400.

[0049] The surface of the crimp terminal 400 is provided with a second tin layer. Please refer to... Figure 5 and Figure 6 A second tin layer covers the inner and outer surfaces of the crimp terminal 400, forming a continuous tin plating layer, especially in the contact area with the enameled wire 210 conductor of the winding 200 and the external lead 300. By providing the second tin layer, the conductivity and oxidation resistance of the crimp terminal 400 are improved. When the crimp terminal 400 is in close contact with the enameled wire 210 conductor and the external lead 300 with the first tin layer during crimping, a low-resistance, high-stability electrical contact is formed between the tin-tin, tin-copper, or tin-aluminum interfaces, effectively suppressing the increase in resistance caused by oxidation or electrochemical corrosion of the contact surface, and reducing power loss and temperature rise at the connection point. Furthermore, the surface tin layer can also isolate the copper terminal from external moisture, refrigerants, and other corrosive media, improving environmental resistance and preventing connection failure due to rust on the terminal body. The thickness of the first tin layer is at least greater than 1 micrometer.

[0050] In one embodiment, the conductor of the winding 200 is made of at least aluminum, and at least one of the crimp terminal 400 and the external lead 300 is made of copper. Using aluminum as the conductor of the winding 200 has the advantages of lower density and lighter weight compared to traditional copper wire, which can significantly reduce the material cost of the stator winding 200 and the overall weight of the motor. However, aluminum has problems such as low conductivity, easy oxidation, poor mechanical strength, and easy galvanic corrosion when in contact with copper. If it is directly crimped with copper external leads 300 or terminals, it is easy to cause increased contact resistance, interface corrosion and connection failure. To this end, by configuring the crimp terminals 400 and / or external leads 300 as copper, and combining the aforementioned technical solution of setting the first tin layer and the second tin layer on the surface, a transitional connection interface isolated by the tin layer is constructed between the aluminum conductor and the copper component. This not only utilizes the excellent conductivity and mechanical strength of copper to improve the reliability of the leads, but also effectively blocks the contact between aluminum and copper through the tin layer to prevent electrochemical corrosion. At the same time, the good ductility and crimpability of the tin layer ensure that a tight, low-resistance and stable electrical connection can still be formed between the aluminum conductor and the copper terminal during the cold pressing process.

[0051] Please refer to Figure 9 and Figure 10 In this embodiment, the positions of the crimp terminal 400 connecting the winding 200 wire and the external lead 300 are as follows: Figure 9 The existing motor design involves contact with the crimp terminal 400, winding 200 wire, and external lead 300 without a solder layer. At a current of 10A, the temperature rise at the crimp terminal 400 of the existing motor is 5.9K, while the temperature rise of this design is 4.6K; at a current of 13.5A, the temperature rise at the crimp terminal 400 of the existing motor is 13.5K, while the temperature rise of this design is 11K; at a current of 16A, the temperature rise at the crimp terminal 400 of the existing motor is 17.1K, while the temperature rise of this design is 13.8K; at a current of 20A, the existing motor… The temperature rise at crimp terminal 400 of the existing motor is 27.5K, while the temperature rise of this solution is 22.3K. At a current of 21A, the temperature rise at crimp terminal 400 of the existing motor is 30.6K, while the temperature rise of this solution is 24.9K. At a current of 22A, the temperature rise at crimp terminal 400 of the existing motor is 33.6K, while the temperature rise of this solution is 27.1K. At a current of 23A, the temperature rise at crimp terminal 400 of the existing motor is 36.5K, while the temperature rise of this solution is 29.5K. Therefore, this solution effectively reduces the temperature rise at crimp terminal 400. For the corresponding information, please refer to... Figure 10The experiment was conducted under extreme temperature conditions of 200°C. In the existing motor design, the surfaces of the crimp terminal 400, winding 200 wires, and external lead 300 are not tinned. After 24 hours, the contact resistance change rate at the crimp terminal 400 of the existing motor reached 130%, while the contact resistance change rate of this design was 107%. After 48 hours, the contact resistance change rate at the crimp terminal 400 of the existing motor reached 146%, while the contact resistance change rate of this design was 109%. After 72 hours, the contact resistance change rate at the crimp terminal 400 of the existing motor reached 178%, while the contact resistance change rate of this design was 110%. After 96 hours, the contact resistance change rate at the crimp terminal 400 of the existing motor reached 201%, while the contact resistance change rate of this design was 110%. Therefore, it can be seen that the connection between the winding 200 and the external lead 300 in this embodiment exhibits stable contact resistance and good reliability under high temperature conditions, ensuring the operational stability of the motor and compressor.

[0052] This invention 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, which will not be repeated here. The compressor includes a housing, and the motor has an outer stator structure. The outer periphery of the stator core 100 is fixed to the inner periphery of the compressor housing. The outer periphery of the stator core 100 and the compressor housing form a loop for the return of refrigeration oil to achieve lubrication and heat dissipation.

[0053] This invention 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 elaborated here. The refrigeration device can be configured as an air conditioner, refrigerator, etc.

[0054] The above description is merely an exemplary embodiment of the present invention and does not limit the scope of protection of the present invention. Any equivalent structural transformations made based on the technical concept of the present invention and the contents of the specification and drawings of the present invention, or direct / indirect applications in other related technical fields, are included within the scope of protection of the present invention.

Claims

1. An electric machine characterized in that, The motor comprises: a winding; and a stator core, the winding being arranged in the stator core, the stator core comprising a yoke portion and a plurality of tooth portions distributed in the inner periphery of the yoke portion, the maximum width of the yoke portion in the radial direction of the stator core being H1, the minimum width of the yoke portion in the radial direction of the stator core being H2, the width of the tooth portion in the circumferential direction of the stator core being W, the maximum inner diameter of the stator core being D1, the maximum outer diameter of the stator core being D2, and the area enclosed by the circle formed by the maximum outer diameter of the stator core and the outer periphery of the stator core being S; Satisfies: , , wherein D1, D2, H1, H2, W are in mm, S is in mm 2 ; wherein the motor further comprises an external lead-out wire and a crimping terminal, the surface of the external lead-out wire being provided with a first tin layer, and the crimping terminal being covered with the wire of the winding and the external lead-out wire, the wire and the external lead-out wire being electrically connected through the crimping terminal.

2. The electric machine of claim 1, wherein, 。 3. The electric machine of claim 1, wherein, The thickness of the first tin layer is δ1, satisfying: .

4. The electric machine of claim 1, wherein, The wire of the winding is configured as an enameled wire, the inner side of the crimping terminal is distributed with a protruding tooth, the protruding tooth is inserted into the enamel of the enameled wire, and the protruding tooth abuts against the conductor in the enameled wire. And / or, the surface of the crimping terminal is provided with a second tin layer.

5. The electric machine of any of claims 3-4, wherein, The material of the wire of the winding is at least configured with an aluminum material, and / or the material of at least one of the crimping terminal and the external lead-out wire is configured with a copper material.

6. A compressor characterized by, The motor comprises any one of the motors according to claims 1 to 5.

7. A refrigeration appliance characterized in that, The compressor comprises the compressor according to claim 6.

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