Motor, compressor and refrigeration equipment

Abstract

The utility model discloses a motor, compressor and refrigeration equipment, and relates to the motor technology field, the motor comprises a stator and a rotor, the minimum inner diameter of the stator is D1, the maximum outer diameter of the stator is D2, the stator comprises a stator iron core, the stator iron core is provided with stator teeth, and the tooth width of the stator teeth is Bt; the rotor is rotationally arranged in the stator, the number of pole pairs of the rotor is P, the rotor comprises a rotor iron core and permanent magnets, the rotor iron core is provided with a plurality of magnet grooves in the circumferential direction, openings of the magnet grooves are arranged towards the outer circumference of the rotor iron core, and three permanent magnets arranged in the extending direction of the magnet grooves are arranged in each magnet groove; the total radial cross section area of the three permanent magnets is S, the distance between points, closest to the outer circumference of the rotor core, of the two permanent magnets located at the ends is X, and the formula is met that (D2 * D1) / (2S * P) / 10 is larger than or equal to 1.1 and smaller than or equal to 3.2, and Bt / X is larger than or equal to 0.28 and smaller than or equal to 0.75. The technical scheme provided by the utility model can further reduce the iron loss under the motor load condition, thereby improving the motor efficiency.

Description

TECHNICAL FIELD

[0001] The utility model relates to motor technical field, especially a kind of motor, compressor and refrigeration equipment. BACKGROUND

[0002] Reducing iron loss is an important technical challenge in current industrial field, especially in motor manufacturing and application. Reducing iron loss not only can improve the energy efficiency of motor, but also can help enterprises occupy a favorable position in fierce market competition under the background of global energy efficiency requirements increasing.

[0003] Therefore, effectively reducing iron loss is one of the problems to be solved by the person skilled in the art. SUMMARY

[0004] The main purpose of the utility model is to provide a kind of motor, compressor and refrigeration equipment, to reduce iron loss, to improve the efficiency of motor.

[0005] To achieve the above object, the utility model provides a motor, comprising:

[0006] Stator, the minimum inner diameter of the stator is D1, the maximum outer diameter of the stator is D2, the stator includes stator core, the stator tooth is equipped on the stator core, and the tooth width of the stator tooth is Bt;And

[0007] Rotor, the rotor is rotationally arranged in the stator, the pole pair number of the rotor is P, the rotor includes rotor core and permanent magnet, the rotor core is provided with a plurality of magnet grooves along the circumferential direction, the opening of the magnet groove is arranged to the outer circumferential circle of the rotor core, three permanent magnets are arranged in each magnet groove along the extension direction of the magnet groove, the total radial cross-sectional area of the three permanent magnets is S, the distance between the two permanent magnets closest to the outer circumferential circle of the rotor core at the end is X, and it satisfies: 1.1≤(D2×D1) / (2S×P) / 10≤3.2, and 0.28≤Bt / X≤0.75.

[0008] In an embodiment, the size of the two permanent magnets at the end in the same magnet groove is the same.

[0009] In an embodiment, the ratio of D1 to D2 ranges from 0.48 to 0.65.

[0010] In an embodiment, the number of stator slots of the stator is Q, the number of motor phases is m, Q / 2P=3 / 2, and 2≤P≤6, 6≤Q≤18, and m=3.

[0011] In an embodiment, an inter-pole air slot is arranged between two adjacent magnet grooves.

[0012] In one embodiment, the inter-electrode air slot is configured as a through slot.

[0013] In one embodiment, the width of the interpole air slot gradually decreases in the radial direction of the rotor away from the rotor center.

[0014] In one embodiment, the rotor core is further provided with a magnetic barrier groove, which is located between the magnet groove and the outer circumference of the rotor core.

[0015] In one embodiment, the stator further includes a winding wound around the stator teeth, wherein the conductor of the winding is enameled wire.

[0016] In one embodiment, the permanent magnet is arranged in the form of a cuboid.

[0017] In one embodiment, the stator core includes a plurality of stacked stator laminations, and the stator teeth are formed on the plurality of stator laminations; and / or

[0018] The rotor core includes multiple stacked rotor laminations, and the magnet slots are formed on the multiple rotor laminations.

[0019] This utility model also proposes a compressor, including the aforementioned motor.

[0020] This utility model also proposes a refrigeration device, including the above-mentioned compressor.

[0021] The technical solution of this utility model, by reasonably setting the parameter relationships of the stator size, the distance between the points of the two permanent magnets at the ends closest to the outer circumference of the rotor core, the tooth width of the stator teeth, the total radial cross-sectional area of ​​the permanent magnets in the same magnet slot, and the number of pole pairs of the motor, limits the value obtained by dividing the ratio of the product of the maximum outer diameter and the minimum inner diameter of the stator to the product of the total radial cross-sectional area of ​​the permanent magnets in the same magnet slot and twice the number of pole pairs of the rotor by 10, to between 1.1 and 3.2. Furthermore, it limits the ratio of the tooth width of the stator teeth to the distance between the points of the two permanent magnets at the ends closest to the outer circumference of the rotor core to between 0.28 and 0.75. This further reduces iron loss under motor load conditions, thereby improving the efficiency of the motor. Attached Figure Description

[0022] 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.

[0023] Figure 1 A cross-sectional structure schematic view of an embodiment of the motor provided by the utility model;

[0024] Figure 2 For Figure 1 A stator structure schematic view of the motor;

[0025] Figure 3 For Figure 1 A rotor structure schematic view of the motor;

[0026] Figure 4 A motor efficiency comparison chart of the present scheme and the prior art;

[0027] Figure 5 A copper loss and iron loss comparison chart of the motor of the present scheme and the prior art;

[0028] Figure 6 A COP comparison chart of the compressor with the motor of the present scheme and the compressor with the prior art motor.

[0029] Explanation of the attached drawings:

[0030] 10, motor; 100, stator; 110, stator core; 111, stator tooth; 120, winding; 200, rotor; 210, rotor core; 211, magnet slot; 212, inter-pole air slot; 213, magnetic barrier slot; 220, permanent magnet.

[0031] The realization, functional features and advantages of the utility model will be further described in combination with the embodiments and with reference to the drawings. DETAILED DESCRIPTION

[0032] The technical scheme in the embodiments of the utility model will be clearly and completely described below in combination with the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all the other embodiments obtained by the person skilled in the art without creative labor belong to the protection scope of the utility model.

[0033] It should be noted that if the embodiments of the utility model involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement condition, etc. between the components in a certain specific posture, and if the specific posture changes, the directional indications will also change accordingly.

[0034] In addition, if the description of "first", "second" and the like is involved in the embodiments of the utility model, the description of "first", "second" and the like is only for the purpose of description, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first" and "second" can be explicitly or implicitly included at least one of the features. In addition, if "and / or" or "and / or" appears throughout the text, it means that the three parallel schemes are included, for example, "A and / or B" includes A scheme, or B scheme, or A and B scheme. In addition, the technical solutions of each embodiment can be combined with each other, but it must be based on the realization of ordinary skilled in the art, when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, and is not within the protection scope required by the utility model.

[0035] Reducing iron loss is an important technical challenge in the current industrial field, especially in motor manufacturing and application. Iron loss, mainly composed of hysteresis loss and eddy current loss, is one of the five major losses of motor, and the other four major losses are stator loss, rotor loss, stray loss and wind friction loss. Reducing iron loss not only can improve the energy efficiency of motor, but also can help enterprises occupy a favorable position in the fierce market competition under the background of increasing global energy efficiency requirements.

[0036] The utility model provides a kind of motor 10.

[0037] Please refer to Figures 1 to 3 In an embodiment of the utility model, the motor 10 includes stator 100 and rotor 200, the minimum inner diameter of the stator 100 is D1, the maximum outer diameter of the stator 100 is D2, the stator 100 includes stator core 110, the stator tooth 111 is equipped on the stator core 110, and the tooth width of the stator tooth 111 is Bt;The rotor 200 is rotationally arranged in the stator 100, the pole pair number of the rotor 200 is P, the rotor 200 includes rotor core 210 and permanent magnet 220, the rotor core 210 is provided with a plurality of magnet grooves 211 along the circumferential direction, the opening of the magnet groove 211 is arranged to the outer circumferential circle of the rotor core 210, three permanent magnets 220 are arranged in each magnet groove 211 along the extension direction of the magnet groove 211, the total radial cross-sectional area of three permanent magnets 220 is S, the distance between the two permanent magnets 220 closest to the outer circumferential circle of the rotor core 210 at the end is X, and satisfies: 1.1≤(D2×D1) / (2S×P) / 10≤3.2, and 0.28≤Bt / X≤0.75.

[0038] It can be understood that the radial dimension of the stator core 110, the distance between the two end permanent magnets 220 closest to the outer circumferential circle of the rotor core 210, the tooth width of the stator tooth 111, the total radial cross-sectional area of all permanent magnets 220 in the same magnet slot 211, and the number of pole pairs of the rotor 200, etc. factors will directly or indirectly affect the iron loss of the motor 10, and the influence of each factor on the iron loss is not single and linear. Instead, the factors interact with each other to determine the size of the iron loss. Therefore, when designing the motor 10, these factors need to be considered comprehensively to reduce the iron loss of the motor 10.

[0039] Specifically, the outer diameter and the inner diameter of the stator core 110 jointly determine the radial dimension of the stator core 110. When the outer diameter of the stator core 110 is constant and the inner diameter increases, the internal resistance of the stator 100 and the rotor 100 will increase, and the stator yoke magnetic potential will increase faster, which will cause the iron loss to increase accordingly. When the inner diameter of the stator core 110 is constant, the smaller the outer diameter of the stator core 110, the smaller the diameter of the stator coil, and the smaller the width of the maximum diameter in the radial direction, which will limit the magnetic flux density. If the magnetic flux density is too high, the motor 10 will generate higher resistance loss under the current that the stator coil can withstand, and the heat dissipation problem will also become more difficult. Since the magnetic flux density is proportional to the iron loss, when the outer diameter of the stator core 110 decreases, the magnetic flux density increases, and the iron loss also increases accordingly. The iron loss will cause the temperature of the stator 100 to rise, thereby reducing the efficiency of the motor 10. In addition, the iron loss will also cause the deformation and damage of the stator core 110, affecting the service life of the motor.

[0040] However, the change of the distance between the two end permanent magnets 220 closest to the outer circumferential circle of the rotor core 210 will affect the magnetic flux density of the motor 10. The magnetic flux density is one of the key factors of the iron loss. As mentioned earlier, when the distance between the two end permanent magnets 220 closest to the outer circumferential circle of the rotor core 210 changes and causes the magnetic field strength to increase, the magnetic flux density in the rotor core 210 may also increase accordingly. Since the magnetic flux density is proportional to the iron loss, the increase of the magnetic flux density may cause the increase of the iron loss.

[0041] In addition, the change of the tooth width of the stator tooth 111 will change the area through which the magnetic flux of the stator tooth 111 passes, thereby affecting the magnetic flux density flowing through the stator core 110, and thus affecting the iron loss.

[0042] In addition, when the total radial cross-sectional area of the permanent magnets 220 in the same magnet slot 211 increases, if other conditions remain unchanged (such as air gap size, core material, etc.), the magnetic flux density may increase accordingly. The increase of the magnetic flux density will cause the increase of the eddy current and hysteresis loss in the core, thereby increasing the iron loss.

[0043] The number of pole pairs of the rotor 200 determines the distribution of the magnetic field inside the rotor 200. As the number of pole pairs increases, the frequency of the change of the magnetic field also increases, which can result in a more complex distribution of the magnetic flux density in the core. Moreover, with the output power unchanged, an increase in the number of pole pairs usually results in a decrease in the rotational speed of the motor and an increase in the torque. In order to maintain the same output power, the magnetic flux density can need to be increased to compensate for the decrease in the rotational speed. However, the increase in the magnetic flux density exacerbates the eddy current and hysteresis loss in the rotor core 210, thereby increasing the iron loss.

[0044] Therefore, in the design of the motor 10, the size of the stator 100, the distance between the two permanent magnets 220 located at the end portions and closest to the points on the outer circumferential circle of the rotor core 210, the tooth width of the stator tooth 111, the total radial cross-sectional area of the permanent magnets 220 in the same magnet slot 211, the number of pole pairs of the rotor 200, and the like need to be considered comprehensively to optimize the iron loss of the motor.

[0045] The technical scheme of the utility model discloses that the ratio of the product of the maximum outer diameter and the minimum inner diameter of the stator 100 to the product of the total radial cross-sectional area of the permanent magnets 220 in the same magnet slot 211 and twice the number of pole pairs of the rotor 200 is divided by 10 to obtain a numerical value limited between 1.1 and 3.2, and the ratio of the tooth width of the stator tooth 111 to the distance between the two permanent magnets 220 located at the end portions and closest to the points on the outer circumferential circle of the rotor core 210 is limited between 0.28 and 0.75, so that the iron loss of the motor 10 under load working conditions can be further reduced, the efficiency of the motor 10 is improved, and the overall efficiency of the compressor is further improved. Figure 4 The efficiency comparison chart of the motor 10 of the present scheme and the existing motor 10 is shown in the following figure: Figure 5 The copper loss and iron loss comparison chart of the motor 10 of the present scheme and the existing motor 10 is shown in the following figure: Figure 6 The COP comparison chart of the compressor equipped with the motor 10 of the present scheme and the compressor equipped with the existing motor 10 is shown in the following figure: Figures 4 to 6 It can be seen that, compared with the motor 10 in the prior art, the copper loss and the iron loss of the motor 10 of the present scheme are both reduced, and the COP of the compressor equipped with the motor 10 of the present scheme is also improved compared with the compressor equipped with the existing permanent magnet motor 10.

[0046] It should be noted that the maximum outer diameter of the stator 100 refers to the straight-line distance from the outermost edge of the stator to the outermost edge on the opposite side. The minimum inner diameter of the stator 100 refers to the straight-line distance from the innermost edge of the stator to the innermost edge on the opposite side.Figure 2 .

[0047] Secondly, the permanent magnets 220 located at the end can be referred to as 221, and the permanent magnets 220 located in the middle can be referred to as 222, referring to Figure 1 and Figure 3 The permanent magnets 220 located at the end refer to the permanent magnets in the same magnet slot 211 that are closest to the outer circumference of the rotor 200. Because the opening of the magnet slot 211 is arranged towards the outer circumference of the rotor core 210, in the same magnet slot 211, there are two permanent magnets closest to the outer circumference of the rotor 200, that is, in the same magnet slot 211, there are two permanent magnets 221 located at the end. Referring to Figure 3 , the extension direction of the magnet slot 211 is shown by the dashed line in Figure 3 .

[0048] Alternatively, the two permanent magnets 220 located at the end in the same magnet slot 211 are of the same size; it can be understood that when the two permanent magnets 220 located at the end in the magnet slot 211 are of the same size, the design and manufacturing process of the permanent magnet 220 can be greatly simplified. The two permanent magnets 220 of the same size have the same assembly process when assembling, which is more convenient and can improve the assembly efficiency. At the same time, during maintenance, if the permanent magnet 220 needs to be replaced, different spare parts do not need to be prepared for permanent magnets 220 in different positions, thereby reducing the maintenance cost. Moreover, the two permanent magnets 220 located at the end in the magnet slot 211 are of the same size, which can more evenly withstand mechanical stress and thermal stress in the magnet slot 211. This helps to prolong the service life of the rotor 200 and improve the durability of the motor 10. Different sizes and shapes do not need to be designed for permanent magnets 220 in different positions, thereby reducing production cost and manufacturing complexity. The permanent magnets 220 of the same size can more evenly distribute the magnetic field in the magnet slot 211. Uniform magnetic field distribution helps to improve the performance of the motor 10, including improving energy utilization efficiency, reducing electromagnetic loss and heat problems. Of course, the present scheme is not limited thereto, and in other embodiments, the two permanent magnets 220 located at the end in the same magnet slot 211 can also be of different sizes.

[0049] It should be noted that the two permanent magnets 220 located at the end are of the same size, which means that the length, width and height of the two permanent magnets 220 located at the end are the same, that is, the size refers to the length, width and height.

[0050] Further, the magnet slots 211 are arranged in a symmetrical structure. It can be understood that the symmetrical structure of the magnet slots 211 helps to optimize the arrangement of the permanent magnets 220, so that the permanent magnets 220 in the magnet slots 211 are also arranged symmetrically, thereby improving the power density of the motor 10, so that the motor 10 can output more power under the same volume. The symmetrical arrangement of the permanent magnets 220 can make the magnetic circuit distribution more uniform, thereby effectively reducing torque ripple and improving the running stability of the motor 10. Moreover, the symmetrical arrangement of the magnet slots 211 can maintain good sinusoidal degree of the air gap magnetic field, which helps to reduce harmonic content and improve the efficiency and electromagnetic performance of the motor 10. The symmetrical structure of the magnet slots 211 can reduce noise and vibration generated during operation of the motor 10, improve the overall operation quality of the motor 10, and in some cases, the symmetrical structure of the magnet slots 211 can provide better demagnetization resistance, thereby improving the service life and reliability of the motor 10.

[0051] With reference to Figures 1 to 3 Optionally, in the present embodiment, the ratio of D1 to D2 is in the range of 0.48≤D1 / D2≤0.65. The ratio of the inner diameter to the outer diameter of the stator 100 is commonly referred to as the split ratio of the motor 10. By adjusting the split ratio, the magnetic coupling effect between the stator 100 and the rotor 200 can be optimized, thereby balancing the electromagnetic performance of the motor 10. This helps to reduce energy loss and improve the efficiency of the motor 10. A proper split ratio can reduce mechanical stress and imbalance during operation of the motor 10, thereby reducing noise and vibration and improving the running stability of the motor 10. By limiting the ratio of the minimum inner diameter of the stator 100 to the maximum outer diameter of the stator 100 to be between 0.48 and 0.65, the present scheme helps to balance the electromagnetic performance of the motor 10, reduce energy loss, improve the efficiency of the motor 10, and at the same time, reduce noise and vibration and improve the running stability of the motor 10. Within this ratio range, the material of the stator core 110 can be more effectively utilized, and the ratio range has a certain flexibility to adapt to the needs of different types, design schemes and application scenarios of the motor 10.

[0052] Further, in the present embodiment, the number of slots of the stator 100 is Q, the number of phases of the motor 10 is m, Q / 2P=3 / 2, 2≤P≤6, 6≤Q≤18, and m=3. In this way, a fractional-slot motor 10 is formed. Under the action of the fractional-slot motor 10, the design of the fractional-slot motor 10 can reduce magnetic field harmonics and torque ripple, thereby improving the running efficiency of the motor 10 and reducing energy consumption. Moreover, since the number of slots of the fractional-slot motor 10 is not an integer multiple, space can be more effectively utilized, making the structure of the motor 10 more compact. Furthermore, the design of the fractional-slot motor 10 makes its operation more stable, reduces the frequency of failures and maintenance, and thereby reduces maintenance costs.

[0053] Optionally, in the present embodiment, an inter-pole air slot 212 is arranged between two adjacent magnet slots 211. The inter-pole air slot 212 can effectively reduce the irreversible demagnetization area of the permanent magnet 220 under the action of the demagnetizing current. When the thickness of the inter-pole air slot 212 in the circumferential direction is large and maintains a certain distance from the surface of the permanent magnet 220, the demagnetization resistance of the permanent magnet 220 can be significantly enhanced. The design of the inter-pole air slot 212 can optimize the magnetic field distribution, so that the permanent magnet motive force is concentrated towards the pole center line, thereby enhancing the magnetic performance of the permanent magnet 220. The presence of the inter-pole air slot 212 can form a barrier to hinder the magnetic flux, guiding the magnetic flux lines to pass out of the side surface of the permanent magnet 220 more effectively and participate in the electromagnetic induction process. By reasonably designing the shape and size of the inter-pole air slot 212, the magnetic field distribution can be adjusted to better meet the design requirements of the motor 10, thereby improving the performance of the motor 10. When a more optimal inter-pole air slot 212 structure is adopted, the decrease in the rated electromagnetic torque of the motor 10 can be controlled within a small range. The design of the inter-pole air slot 212 also helps to reduce the inertia of the rotor 200, thereby improving the response speed and speed regulation performance of the motor 10. By optimizing the geometric size and position of the inter-pole air slot 212, the energy consumption and noise of the motor 10 can be further reduced, and the overall efficiency and stability of the motor 10 can be improved.

[0054] Further, the inter-pole air slot 212 is in the form of a through slot. This is because the through slot design can effectively guide the path of the magnetic flux, making the magnetic field distribution more uniform and reducing the situation of excessive local magnetic field strength. Uniform magnetic field distribution helps to improve the operating efficiency and stability of the motor 10, and reduces energy consumption and noise. Moreover, by optimizing the geometric size and position of the through slot, the demagnetization resistance of the permanent magnet 220 can be further enhanced, especially under high speed or high load conditions. The enhancement of the demagnetization resistance helps to prolong the service life of the permanent magnet 220 and improve the reliability and durability of the motor 10. The through slot structure can increase the heat dissipation area of the surface of the rotor 200, which is beneficial to heat dissipation and cooling of the motor 10. Good heat dissipation performance helps to reduce the temperature rise of the motor 10 and improve the thermal stability and service life of the motor 10. Of course, the present scheme is not limited thereto, and in other embodiments, the inter-pole air slot 212 can also be in the form of a notch slot.

[0055] Further optionally, the width of the inter-pole air slot 212 gradually decreases in the direction away from the center of the rotor 200. This can more effectively guide the distribution of magnetic induction lines, making it more uniform. This design helps to reduce the distortion of the magnetic field near the outer periphery of the rotor 200, improving the sinusoidal degree and stability of the magnetic field. By optimizing the width variation of the inter-pole air slot 212, the magnetic energy of the permanent magnet 220 can be more effectively utilized. This helps to reduce the waste of the permanent magnet 220, improving the overall efficiency and performance of the motor 10. The gradual decrease in the width of the inter-pole air slot 212 helps to enhance the anti-demagnetization capability of the permanent magnet 220. Under high speed or high load conditions, this design can more effectively protect the permanent magnet 220 from demagnetization. By adjusting the width variation of the inter-pole air slot 212, the electromagnetic parameters of the motor 10, such as inductance, resistance, etc., can be optimized. This helps the motor 10 to maintain high efficiency and stable operation under a wider range of speed and load conditions. Of course, this scheme is not limited to this, and in other embodiments, the width of the inter-pole air slot 212 can also remain unchanged near the outer periphery of the rotor 200.

[0056] Optionally, the rotor core 210 is also provided with a magnetic barrier slot 213, which is arranged between the magnet slot 211 and the outer periphery of the rotor core 210. That is, the magnetic barrier slot 213 is located within the effective range of the permanent magnet 220 and the stator 100, and the tangential components of the interaction forces of the two ends of the magnetic barrier slot 213 with the stator teeth 111 and the stator slot tend to be opposite. In this way, when the rotor 200 rotates around the axis, the interaction forces between the stator teeth 111 and the stator slot in each pole of the motor 10 tend to cancel each other out, thereby weakening the cogging torque pulsation and reducing the speed fluctuation of the permanent magnet motor 10.

[0057] Further, the magnetic barrier slot 213 is arranged between the permanent magnet 220 at the end and the outer periphery of the rotor core 210. This can reduce the impact on the permanent magnet flux linkage, while also regulating the magnetic flux path and weakening the magnetic field harmonics in the air gap. It can also alleviate the degree of magnetic saturation and form a magnetic barrier during the rotation of the rotor 200 of the motor 10, thereby improving the power density and torque density of the motor 10, enhancing the overload capacity of the motor 10, effectively improving the torque pulsation of the motor 10, and greatly improving the performance of the motor 10 while reducing the amount of permanent magnet 220 used in the motor 10, i.e. reducing production costs, and improving product competitiveness.

[0058] Moreover, the arrangement of the magnetic barrier slot 213 can increase the gas-liquid flow area, reduce the amount of permanent magnet 220 used, and reduce the complexity of the assembly process of the motor 10.

[0059] Furthermore, the arrangement of the magnetic barrier slot 213 can increase the gas-liquid flow area, thereby increasing the cooling efficiency of the motor 10.

[0060] Optionally, the stator 100 further comprises a winding 120 arranged around the stator teeth 111, and the wire of the winding 120 is made of enameled wire; it can be understood that the insulating layer of the enameled wire is composed of special insulating paint and has good insulating performance. Such an insulating layer can effectively isolate the current and prevent short circuit or leakage of current in the winding 120, thereby improving the safety performance of the motor 10. During the operation of the motor 10, the stator 100 winding 120 will generate a certain amount of heat. The enameled wire has high high-temperature resistance and can maintain a stable working state at high temperature without causing aging or burning of the winding 120 material due to high temperature. In the working environment of the motor 10, the winding 120 material may come into contact with some corrosive substances such as water, acid and alkali. The enameled wire has good corrosion resistance and can maintain a stable working state in a corrosive environment without causing damage to the winding 120 material due to corrosion. During the operation of the motor 10, the stator 100 winding 120 will be subjected to certain mechanical pressure and vibration force. The enameled wire has good mechanical strength and can withstand certain mechanical pressure and vibration force to ensure the integrity and stability of the winding 120. The enameled wire as a protective layer of the winding 120 coil can reduce damage and short circuit of the stator 100 winding 120 due to mechanical vibration and contact. It can also tightly connect each winding 120 coil to make it more firmly fixed on the stator 100, reducing the risk of coil falling off and displacement of the stator 100 due to mechanical vibration. Of course, the present scheme is not limited thereto, and in other embodiments, the wire of the winding 120 can also be bare wire without enamel.

[0061] Optionally, in the present embodiment, the permanent magnet 220 is in the shape of a cuboid; this is because the cuboid-shaped permanent magnet 220 can provide a stable magnetic field and reduce energy loss during operation of the motor 10, thereby greatly improving the conversion efficiency of the motor 10. At the same time, the motor 10 using the cuboid-shaped permanent magnet 220 does not need additional excitation current, and the efficiency of the motor 10 is further improved. Such high efficiency helps to reduce energy consumption and improve the economic efficiency of the equipment.

[0062] In the embodiment, the stator core 110 comprises a plurality of stator laminations arranged in a stack, and the stator teeth 111 are formed on the plurality of stator laminations; that is, the stator core 110 is formed by axially stacking a plurality of stator laminations, and the stator laminations are of an integral structure. The integral structure is simple in process, reduces the manufacturing difficulty of the stator core 110, and thus can reduce the production cost of the motor 10. In addition, the stator laminations are arranged in an integral structure, which can improve the mechanical properties of the stator core 110, and thus can improve the stability of the motor 10 during operation and the service life of the motor 10. In another embodiment, the stator core 110 can also be formed by splicing a plurality of stator core 110 sub-modules. Thus, when winding the coils, the coils can be wound first and then the stator core 110 is spliced. Thus, the size of the slot opening of the stator 100 slot on the side close to the rotor core 210 can be set as small as possible. Since the coils are wound from the slot opening of the stator 100 slot in the integral structure of the stator core 110, in the spliced stator core 110, the coils can be wound first and then the stator core 110 is spliced. Thus, the distance of the slot opening of the stator 100 slot can be reduced. Ideally, the size of the slot opening of the stator 100 slot can be set to 0. By winding first and then splicing, the space for winding can be increased, and thus the installation efficiency of the motor 10 can be improved. In addition, the size of the stator 100 slot opening can be reduced, and thus the noise of the motor 10 during operation can be reduced. The two structures have their own advantages, and can be selected according to actual needs.

[0063] It should be noted that the stator teeth 111 are formed on the plurality of stator laminations, which can be understood as that the stator laminations are provided with sub-stator teeth, and when the plurality of stator laminations are stacked to form the stator core 110, the plurality of sub-stator teeth are stacked to form the stator teeth 111.

[0064] Further, the thicknesses of the stator laminations of the stator core 110 are the same, and the magnetic conductive materials used are the same.

[0065] Further, the stator laminations are soft magnetic material laminations. Soft magnetic materials can achieve a large magnetization intensity with a small external magnetic field, and have low coercive force and high magnetic permeability, which is conducive to reducing the loss of the stator core 110, that is, reducing the iron loss of the motor 10, and thus is conducive to improving the performance of the motor 10.

[0066] Further, in an embodiment, the stator laminations are made of silicon steel sheets. The silicon steel sheets have low iron loss, high stacking coefficient, good magnetic induction intensity, and good lamination performance, thereby ensuring good working performance of the stator laminations. The silicon steel sheets can reduce eddy current loss and hysteresis loss, thereby reducing the heating of the core, and the plurality of silicon steel sheets are insulated from each other, which can reduce the overcurrent area and further reduce the heating. Of course, the present application is not limited to this, and in other embodiments, the stator laminations are made of neodymium iron boron, ferrite, or other permanent magnetic materials.

[0067] Further, in the embodiment, the rotor core 200 comprises a plurality of rotor laminations stacked together, and the magnet slot 211 is formed on the plurality of rotor laminations; that is, the rotor core 210 is formed by stacking and stamping a plurality of rotor laminations; the rotor laminations are of an integral structure, the integral structure process is simple, the manufacturing difficulty of the rotor core 210 is reduced, and thus the production cost of the motor 10 can be reduced. In addition, the rotor laminations are arranged in an integral structure, the mechanical properties of the rotor core 210 can be improved, and thus the stability during operation of the motor 10 and the service life of the motor 10 can be improved.

[0068] It should be noted that the magnet slot 211 is formed on the plurality of rotor laminations, which can be understood as that the rotor laminations are provided with sub-magnet slots, and when the plurality of rotor laminations are stacked together, the plurality of magnet slots are stacked together to form the magnet slot 211.

[0069] Optionally, the rotor laminations are soft magnetic material laminations, the soft magnetic material can achieve a large magnetization intensity with a small external magnetic field, the soft magnetic material has low coercivity and high magnetic permeability, which is conducive to reducing the loss of the rotor core 210, that is, reducing the iron loss of the motor 10, and thus conducive to improving the performance of the motor 10.

[0070] Further, in the embodiment, the rotor core 210 is a silicon steel sheet, the silicon steel sheet can reduce eddy current loss and hysteresis loss, and thus reduce the heating of the rotor core 210, and the plurality of silicon steel sheets are insulated from each other, which can reduce the overcurrent area and further reduce the heating. It can be understood that the rotor laminations can also be neodymium iron boron or ferrite or other materials.

[0071] Further, in an embodiment, the rotor laminations and the stator laminations can be different materials or shapes, so as to meet the needs of different processing technologies of the stator 100 and the rotor 200, and facilitate selection of appropriate laminations to form the rotor core 210 and the stator core 110 according to the performance requirements of the motor 10, thereby ensuring good performance of the motor 10, and also improving the wide application range of the motor 10. Of course, the utility model is not limited to this, in some other embodiments, the stator laminations stacked to form the stator core 110 and the rotor laminations stacked to form the rotor core 210 are of the same material, thereby facilitating mass production of the laminations and reducing manufacturing costs.

[0072] The utility model also proposes a compressor, the compressor includes motor, the specific structure of the motor refers to the above embodiment, because the compressor adopts all the technical schemes of the above all embodiments, therefore at least has all the beneficial effects brought by the technical scheme of the above embodiment, here will not repeat again.

[0073] The utility model discloses still a kind of refrigeration equipment, which comprises compressor, and the specific structure of the compressor refers to the above embodiment, since the refrigeration equipment adopts all technical solutions of the above all embodiments, thus at least has all beneficial effects brought by the technical solutions of the above embodiments, which will not be repeated here.

[0074] The above is only an exemplary embodiment of the utility model, and does not limit the patent scope of the utility model, and any equivalent structural transformation made by using the utility model specification and drawings, or direct / indirect application in other related technical fields is included in the patent protection scope of the utility model.

Claims

1. An electric machine characterized in that, The motor comprises: a stator, a minimum inner diameter of the stator being D1, a maximum outer diameter of the stator being D2, the stator comprising a stator core, the stator core being provided with stator teeth, a tooth width of the stator teeth being Bt; and a rotor, the rotor being rotatably arranged in the stator, a pole pair number of the rotor being P, the rotor comprising a rotor core and permanent magnets, the rotor core being provided with a plurality of magnet grooves in a circumferential direction, the magnet grooves being provided with openings towards an outer circumferential circle of the rotor core, each of the magnet grooves being provided with three permanent magnets arranged in an extending direction of the magnet groove, a total radial cross-sectional area of the three permanent magnets being S, a distance between two end permanent magnets closest to the outer circumferential circle of the rotor core being X, satisfying: 1.1≤(D2×D1) / (2S×P) / 10≤3.2, and 0.28≤Bt / X≤0.

75.

2. The electric machine of claim 1, wherein, In the same magnet groove, sizes of the two end permanent magnets are the same.

3. The electric machine of claim 1, wherein, A ratio of the D1 to the D2 ranges from 0.48 to 0.

65.

4. The electric machine of claim 1, wherein, A number of stator slots of the stator is Q, a number of motor phases is m, Q / 2P=3 / 2, and 2≤P≤6, 6≤Q≤18, and m=3.

5. The electric machine of claim 1, wherein, Adjacent two magnet grooves are provided with an inter-pole air groove.

6. The electric machine of claim 5, wherein, The inter-pole air groove is provided in a through groove manner.

7. The electric machine of claim 5, wherein, A width of the inter-pole air groove gradually decreases in a direction away from a rotor center.

8. The electric machine of claim 1, wherein, The rotor core is further provided with a magnetic barrier groove, the magnetic barrier groove being arranged between the magnet groove and the outer circumferential circle of the rotor core.

9. The electric machine of any one of claims 1 to 8, wherein, The stator further comprises a winding arranged on the stator teeth, and a wire of the winding is a lacquered wire.

10. The electric machine of any one of claims 1 to 8, wherein, The permanent magnet is provided in a cuboid manner.

11. The electric machine of any one of claims 1 to 8, wherein, The stator core comprises a plurality of stator laminations arranged in a lamination manner, and the stator teeth are formed on the plurality of stator laminations; and / or The rotor core comprises a plurality of rotor laminations arranged in a lamination manner, and the magnet grooves are formed on the plurality of rotor laminations.

12. A compressor characterized by, The motor comprises any one of claims 1 to 11.

13. A refrigeration appliance characterized by, The compressor comprises claim 12.

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