Motor, compressor and refrigeration equipment

Abstract

The utility model discloses a motor, compressor and refrigeration equipment, relates to the motor technical field, the motor comprises a stator and a rotor, the rotor is rotatingly arranged in the stator, the rotor comprises a rotor iron core and a permanent magnet, the rotor iron core is provided with a plurality of magnet grooves along the circumferential direction, the opening of the magnet groove is arranged towards the outer circumference of the rotor iron core, and the permanent magnet is arranged in the rotor iron core. The magnet grooves are symmetrically arranged, each magnet groove is internally provided with three permanent magnets arranged in the extending direction of the magnet groove, and the included angle between the permanent magnet located in the middle and the permanent magnet located at the end of the three permanent magnets is alpha, the included angle between the connecting line of the point, closest to the outer circumference of the rotor core, of the permanent magnet at the end and the circle center of the rotor core and the symmetry axis of the magnet groove is beta; the number of pole pairs of the rotor is P, 1.5 < = alpha / (P * beta) < = 3.5, 130 DEG < = alpha < = 160 DEG, and 0.8 < = beta / (57.33 DEG / P) < = 1.3. 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 those skilled in the art. INVENTION CONTENTS

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

[0005] To achieve the above-mentioned purpose, the motor provided by the utility model comprises:

[0006] Stator; and

[0007] Rotor, the rotor is rotatably arranged in the stator, the rotor includes rotor core and permanent magnet, the rotor core is provided with a plurality of magnet slots in the circumferential direction, the opening of the magnet slot is arranged towards the outer circumferential circle of the rotor core, the magnet slot is symmetrically arranged, three permanent magnets arranged along the extension direction of the magnet slot are arranged in each magnet slot, the included angle between the permanent magnet located in the middle and the permanent magnet located at the end of the three permanent magnets is α, the included angle between the line connecting the point closest to the outer circumferential circle of the rotor core of the permanent magnet located at the end and the center of the rotor core and the symmetry axis of the magnet slot is β.

[0008] The pole pair number of the rotor is P, 1.5≤α / (P×β)≤3.5, 130°≤α≤160°, 0.8≤β / (57.33° / P)≤1.3.

[0009] In an embodiment, the width of the permanent magnet located at the end in the same magnet slot is L1, and the width of the permanent magnet located in the middle is L2, and the relationship between L1 and L2 is 0.3≤L2 / L1≤1.2.

[0010] In an embodiment, an inter-pole air slot is arranged between two adjacent magnet slots.

[0011] In an embodiment, the inter-pole air slot is arranged in the form of a through slot.

[0012] 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.

[0013] In an embodiment, the rotor core is further provided with a magnetic barrier slot, and the magnetic barrier slot is arranged between the magnet slot and the outer circumferential circle of the rotor core.

[0014] In an embodiment, the magnetic barrier slot is provided in plurality, and the plurality of magnetic barrier slots are symmetrically arranged about the symmetry axis of the magnet slot.

[0015] In an embodiment, the minimum inner diameter of the stator is D1, the maximum outer diameter of the stator is D2, and 0.48≤D1 / D2≤0.65.

[0016] In an embodiment, the stator comprises a stator core and a winding arranged on the stator core, and the wire of the winding is made of enameled wire.

[0017] In an embodiment, the permanent magnet is arranged in a square shape.

[0018] In an embodiment, the stator comprises a stator core, and the stator core comprises a plurality of stator laminations arranged in a stacked manner; and / or

[0019] The rotor core comprises a plurality of rotor laminations arranged in a stacked manner, and the magnet slot is formed on the plurality of rotor laminations.

[0020] The utility model also proposes a kind of compressor comprising above-mentioned motor.

[0021] The utility model also proposes a kind of refrigeration equipment comprising above-mentioned compressor.

[0022] The technical scheme of the utility model limits the ratio of the product of the included angle α between the permanent magnet in the middle and the permanent magnet at the end and the included angle β between the line connecting the point closest to the outer circumferential circle of the rotor core of the permanent magnet at the end and the center of the rotor core and the symmetry axis of the magnet slot and the number of pole pairs P of motor to between 1.5 and 3.5, limits the range of α to 130°≤α≤160°, and limits the relationship between β and P to 0.8≤β / (57.33° / P)≤1.3, so as to further reduce the iron loss of motor 10 under load working condition, improve the efficiency of motor, and improve the overall energy efficiency of compressor. BRIEF DESCRIPTION OF DRAWINGS

[0023] In order to more clearly illustrate the technical solutions of the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiment or prior art description. Obviously, the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained according to the structures shown in these drawings without creative labor.

[0024] Figure 1 The cross-sectional structure schematic diagram of the motor in the present application is provided.

[0025] Figure 2 The cross-sectional structure schematic diagram of the motor in the present application is provided. Figure 1 The cross-sectional structure schematic diagram of the motor in the present application is provided.

[0026] Figure 3 The cross-sectional structure schematic diagram of the motor in the present application is provided. Figure 1 The cross-sectional structure schematic diagram of the motor in the present application is provided.

[0027] Figure 4 The efficiency comparison diagram of the motor in the present application and the existing motor is provided.

[0028] Figure 5 The copper loss and iron loss comparison diagram of the motor in the present application and the existing motor is provided.

[0029] Figure 6 The COP comparison diagram of the compressor carrying the motor in the present application and the compressor carrying the existing motor under SEER30 working condition is provided.

[0030] Figure 7 The COP comparison diagram of the compressor carrying the motor in the present application and the compressor carrying the existing motor under SEER60 working condition is provided.

[0031] Explanation of the drawings:

[0032] 10, motor; 100, stator; 110, stator core; 120, winding; 200, rotor; 210, rotor core; 211, magnet slot; 212, inter-pole air slot; 213, magnetic barrier slot; 220, permanent magnet.

[0033] The implementation, functional characteristics and advantages of the present application will be further described with reference to the embodiments and the drawings. Specific implementation

[0034] With reference to the drawings of the embodiments of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described, obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative labor are within the protection scope of the present application.

[0035] It should be noted that if the embodiments of the present application involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative positional relationship, movement condition, etc. between the components in a certain posture, and if the certain posture changes, the directional indications will also change accordingly.

[0036] In addition, if the embodiments of the present application involve descriptions of "first", "second", etc., the descriptions of "first", "second", etc. are only for description purposes, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first" and "second" can explicitly or implicitly include at least one of the features. In addition, "and / or" or "and / or" appearing throughout the text means that the three parallel schemes are included, for example, "A and / or B" includes A scheme, or B scheme, or A and B simultaneously satisfy the scheme. In addition, the technical solutions of each embodiment can be combined with each other, but it must be based on the realization of the 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 present application.

[0037] Reducing iron loss is an important technical challenge in the current industrial field, especially in the field of 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 improves the energy efficiency of the motor, but also helps enterprises occupy a favorable position in the fierce market competition under the background of increasing global energy efficiency requirements.

[0038] In order to solve the problem of iron loss of motor 10, the present application provides a motor 10.

[0039] Please refer to Figures 1 to 3In the embodiment of the utility model, the motor 10 includes the stator 100 and the rotor 200, the rotor 200 rotates and is arranged in the stator 100, the rotor 200 includes the rotor iron core 210 and the permanent magnet 220, the rotor iron core 210 is equipped with a plurality of magnet slots 211 along the circumferential direction, the opening of the magnet slot 211 is towards the outer circumferential circle of the rotor iron core 210 and is arranged, the magnet slot 211 is symmetrically arranged, three permanent magnets 220 are arranged in each magnet slot 211 along the extension direction of the magnet slot 211, the included angle between the permanent magnet 220 in the middle of the three permanent magnets 220 and the permanent magnet 220 at the end is alpha, the included angle between the line connecting the point closest to the outer circumferential circle of the rotor iron core 210 of the permanent magnet 220 at the end and the center of the rotor iron core 210 and the symmetry axis of the magnet slot 211 is beta, the pole pair number of the rotor 200 is P, 1.5 <= alpha / (P*beta) <= 3.5, 130 <= alpha <= 160, 0.8 <= beta / (57.33 / P) <= 1.3.

[0040] It can be understood that in the same magnet slot 211, the included angle between the line connecting the point closest to the outer circumferential circle of the rotor iron core 210 of the permanent magnet 220 and the center of the rotor iron core 210 and the symmetry axis of the magnet slot, the included angle between the two permanent magnets 220 and the pole pair number of the motor 10 will directly or indirectly affect the iron loss of the motor 10, but 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 1.

[0041] Specifically, three permanent magnets 220 are arranged in each magnet slot 211, and when the included angle between the permanent magnet 220 in the middle of the three permanent magnets 220 and the permanent magnet 220 at the end changes, it will affect the magnetic field distribution inside the motor. When the included angle is appropriate, the magnetic field distribution may be more uniform, and the distribution of magnetic flux density in the rotor iron core 210 will also be more reasonable. However, if the included angle is too large or too small, it may cause uneven magnetic field distribution, and the magnetic flux density in some areas may be too high or too low, thereby affecting the iron loss.

[0042] In addition, the included angle between the line connecting the point closest to the outer circumferential circle of the rotor iron core 210 of the permanent magnet 220 at the end and the center of the rotor iron core 210 and the symmetry axis of the magnet slot 211 will also affect the magnetic field distribution inside the motor. Thus affecting the magnetic flux density of the motor, and further affecting the iron loss.

[0043] In the motor 10, when the pole pair number of the rotor 200 increases, the alternating frequency of the winding 120 increases, thereby increasing the tooth loss. Especially in high-speed motors, as the pole pair number increases, the iron loss will increase significantly.

[0044] Therefore, when designing the motor 10, the angle between the line connecting the point where the permanent magnet 220 is closest to the outer circumferential circle of the rotor core 210 and the center of the rotor core 210 and the symmetry axis of the magnet slot, the included angle between the two adjacent permanent magnets 220, and the pole pair number of the motor 10 need to be comprehensively considered to optimize the iron loss of the motor 10.

[0045] The technical scheme of the utility model discloses three permanent magnets 220 arranged in the same magnet slot 211 along the extension direction of the magnet slot 211, and reasonably sets the included angle between the line connecting the point where the permanent magnet 220 closest to the outer circumferential circle of the rotor core 210 and the center of the rotor core 210 and the symmetry axis of the magnet slot 211, the included angle between the permanent magnet 220 in the middle and the permanent magnet 220 at the end, and the relationship between the pole pair number of the motor 10, limits the ratio of the product of the included angle α between the permanent magnet 220 in the middle and the permanent magnet 220 at the end and the pole pair number P of the rotor 200 and the included angle β between the line connecting the point where the permanent magnet 220 closest to the outer circumferential circle of the rotor core 210 and the center of the rotor core 210 and the symmetry axis of the magnet slot 211 to between 1.5 and 3.5, so that the iron loss of the motor 10 under load working condition can be reduced, the efficiency of the motor 10 is improved, and the overall efficiency of the compressor is improved.

[0046] Secondly, the range of α is limited to 130°≤α≤160°, and in this angle range, the interaction force between the middle permanent magnet 220 and the two permanent magnets 220 at the ends can be optimized. This interaction helps to enhance the stability and reliability of the entire magnetic circuit, reduces the failure caused by the loosening or falling of the magnet. Moreover, reasonable angle design can reduce the magnetic leakage phenomenon between the magnets. Magnetic leakage refers to the phenomenon that the magnetic field leaks from the surface of the magnet to the external space, which will cause the reduction of the magnetic field efficiency. By limiting the angle α between the middle permanent magnet 220 and the permanent magnet 220 at the end to between 130° and 160°, the present scheme optimizes the angle, so that the magnetic field can be more concentrated inside the magnet slot 211, the magnetic leakage is reduced, and the utilization efficiency of the magnetic field is improved. In the limited space of the magnet slot 211, the space is more effectively utilized. It helps to reduce the size and weight of the magnet slot 211 while maintaining the same performance, thereby reducing the cost and energy consumption.

[0047] It should be noted that the magnet slot 211 is symmetrically arranged, which means that the magnet slot 211 itself has an axisymmetric structure. Secondly, referring to Figure 1 and Figure 3In the same magnet slot 211, among the three permanent magnets 220, the permanent magnet 220 located at the end can be denoted as 221. The permanent magnet 221 located at the end refers to the permanent magnet closest to the outer circumferential circle of the rotor 200 among the three permanent magnets 220 in the same magnet slot 211. Because the opening of the magnet slot 211 is arranged to the outer circumferential circle of the rotor core 210, in the same magnet slot 211, there are two permanent magnets closest to the outer circumferential circle of the rotor 200, that is, in the same magnet slot 211, there are two permanent magnets 221 located at the end. The permanent magnet 220 located in the middle can be denoted as 222, and the permanent magnet 222 located in the middle refers to the permanent magnet located in the middle among the three permanent magnets 220 in the same magnet slot 211.

[0048] With reference to Figure 3 , the extension direction of the magnet slot 211 is indicated by the dashed line in Figure 3 .

[0049] Further, in the present embodiment, the relationship between the β and the P is 0.8≤β / (57.33° / P)≤1.3. It can be understood that the motor of the present embodiment satisfies 0.8≤β / (57.33° / P)≤1.3, 130°≤α≤160°, and 1.5≤α / (P×β)≤3.5. In this way, the eddy current loss and the iron loss of the permanent magnet 220 of the motor 10 can be further reduced, the efficiency of the motor 10 is improved, and the overall efficiency of the compressor is improved.

[0050] Figure 4 FIG. 10 is a comparison chart of the efficiency of the motor 10 of the present solution and the existing motor 10, Figure 5 FIG. 11 is a comparison chart of the copper loss and the iron loss of the motor 10 of the present solution and the existing motor 10, Figure 6 FIG. 12 is a comparison chart of the COP of the compressor equipped with the motor 10 of the present solution and the compressor equipped with the existing motor 10 under the SEER30 working condition, Figure 7 FIG. 13 is a comparison chart of the COP of the compressor equipped with the motor 10 of the present solution and the compressor equipped with the existing motor 10 under the SEER60 working condition, with reference to Figure 4 It can be known that the motor 10 of the present solution can effectively improve the efficiency of the motor 10 whether the rotating speed is 1800 rpm or 3600 rpm, with reference to Figure 5 It can be known that the motor 10 of the present solution can effectively reduce the iron loss and the copper loss compared with the motor 10 of the prior art, with reference to Figure 6 and Figure 7 It can be known that the COP of the compressor equipped with the motor 10 of the present solution is also improved compared with the compressor equipped with the existing permanent magnet motor 10.

[0051] The magnet slots 211 are symmetrically arranged, which can help to optimize the arrangement of the permanent magnets 220, and can make the permanent magnets 220 in the magnet slots 211 also symmetrically arranged, thereby improving the power density of the motor 10, so that the motor 10 can output more power under the same volume. The symmetrically arranged permanent magnets 220 can make the magnetic circuit more uniform, thereby effectively reducing the torque ripple and improving the running stability of the motor 10. Moreover, the symmetrically arranged magnet slots 211 can keep the sinusoidal degree of the air gap magnetic field good, which helps to reduce the harmonic content and improve the efficiency and electromagnetic performance of the motor 10. The symmetrically arranged magnet slots 211 can reduce the noise and vibration generated during the operation of the motor 10, improve the overall operation quality of the motor 10, and in some cases, the symmetrically arranged magnet slots 211 can provide better demagnetization resistance, thereby improving the service life and reliability of the motor 10.

[0052] Optionally, the sizes of the two permanent magnets 220 located at the ends in the same magnet slot 211 are the same. It can be understood that when the sizes of the two permanent magnets 220 located at the ends in the magnet slot 211 are the same, the design and manufacturing process of the permanent magnets 220 can be greatly simplified. The two permanent magnets 220 with the same size have the same assembly process, which is more convenient and has high assembly efficiency. At the same time, during maintenance, if the permanent magnets 220 need to be replaced, different spare parts do not need to be prepared for permanent magnets 220 at different positions, thereby reducing the maintenance cost. Moreover, the two permanent magnets 220 located at the ends in the magnet slot 211 have the same size, which can more evenly bear 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 at different positions, thereby reducing the production cost and manufacturing complexity. The permanent magnets 220 with 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 to this, and in other embodiments, the sizes of the two permanent magnets 220 located at the ends in the same magnet slot 211 can also be different.

[0053] It should be noted that the sizes of the two permanent magnets 220 located at the ends refer to the length, width and height of the two permanent magnets 220 located at the ends, that is, the size refers to the length, width and height.

[0054] Referring to Figure 1 and Figure 3Further, the width of the permanent magnets 220 at the ends of the same magnet slot 211 is L1, and the width of the permanent magnets 220 in the middle is L2, the relationship between L1 and L2 is 0.3≤L2 / L1≤1.2; by adjusting the width distribution of the permanent magnets 220 in the magnet slot 211, the magnetic field distribution inside the entire motor 10 can be optimized. This optimization helps to reduce the unevenness of the magnetic field, improve the operating efficiency and stability of the motor 10. The wider permanent magnets 220 may increase eddy current loss, especially in high-power or high-speed motors 10. Limiting the width ratio of the end permanent magnets 220 to the middle permanent magnets 220 to the range of 0.3 to 1.2 helps to balance the eddy current loss and magnetic field strength, ensuring that the motor 10 operates efficiently while keeping the eddy current loss within a controllable range. Cogging torque is a common pulsation problem in permanent magnet motors 10, which affects the smooth operation of the motor 10. By reasonably selecting the width of the permanent magnets 220, especially limiting the width ratio of the end permanent magnets 220 to the middle permanent magnets 220 to the range of 0.3 to 1.2, the fundamental component in the cogging torque can be effectively suppressed, thereby reducing torque ripple and improving the smoothness of the motor 10.

[0055] Further optionally, an inter-pole air slot 212 is provided between adjacent two magnet slots 211; the inter-pole air slot 212 can effectively reduce the area of irreversible demagnetization of the permanent magnet 220 under the action of 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 anti-demagnetization ability of the permanent magnet 220 will be significantly enhanced. The design of the inter-pole air slot 212 can optimize the magnetic field distribution, concentrate the permanent magnet motive force towards the magnetic pole center line, thereby enhancing the magnetic performance of the permanent magnet 220. The existence 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 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, improving the performance of the motor 10. When using a more optimal inter-pole air slot 212 structure, the degree of 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.

[0056] In this embodiment, the inter-pole air slot 212 is designed as a through slot. This design can effectively guide the path of magnetic induction lines, making the magnetic field distribution more uniform and reducing the local magnetic field strength. Uniform magnetic field distribution helps to improve the operating efficiency and stability of the motor 10, reduce energy consumption and noise. By optimizing the geometric size and position of the through slot, the anti-demagnetization ability of the permanent magnet 220 can be further enhanced, especially under high speed or high load conditions. The enhancement of the anti-demagnetization ability 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 rotor 200 surface, 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, this solution is not limited to this, in other embodiments, the inter-pole air slot 212 can also be designed as a notch slot.

[0057] 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 them more uniform. This design helps to reduce the distortion of the magnetic field near the outer circle of the rotor 200, improve the sinusoidal degree and stability of the magnetic field, and more effectively utilize the magnetic energy of the permanent magnet 220 by optimizing the width variation of the inter-pole air slot 212. This helps to reduce the waste of the permanent magnet 220 and improve the overall efficiency and performance of the motor 10. The gradual decrease in the width of the inter-pole air slot 212 also helps to enhance the anti-demagnetization ability 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 solution is not limited to this, in other embodiments, the width of the inter-pole air slot 212 can also remain unchanged in the direction close to the outer circle of the rotor 200.

[0058] In this embodiment, the number of pole pairs of the rotor 200 is P, 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. This forms a fractional slot motor 10, which can reduce magnetic field harmonics and torque ripple, thereby improving the operating 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, it can make more effective use of space, making the structure of the motor 10 more compact. Furthermore, the design of the fractional slot motor 10 makes its operation more stable, reducing the frequency of failures and maintenance, thereby reducing maintenance costs.

[0059] Optionally, in the present embodiment, the rotor core 210 is further provided with a magnetic barrier groove 213, which is arranged between the magnet slot 211 and the outer circumferential surface of the rotor core 210; that is, the magnetic barrier groove 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 groove 213 with the stator 100 teeth and the stator 100 slots tend to be opposite. Thus, when the rotor 200 rotates around the axis, the interaction forces between the stator 100 teeth and the stator 100 slots in each pole of the motor 10 tend to cancel each other out, thereby weakening the cogging torque ripple and reducing the speed fluctuation of the permanent magnet motor 10.

[0060] Further, the magnetic barrier groove 213 is arranged between the permanent magnet 220 at the end and the outer circumferential surface of the rotor core 210, which can regulate the magnetic flux path and weaken the magnetic field harmonics in the air gap while reducing the impact on the permanent magnet flux linkage. 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 ripple of the motor 10, greatly improving the performance of the motor 10, and improving the product competitiveness while reducing the use of permanent magnets 220 in the motor 10, i.e., reducing production costs.

[0061] Moreover, the arrangement of the magnetic barrier groove 213 can increase the gas-liquid flow area, reduce the use of permanent magnets 220, and reduce the complexity of the assembly process of the motor 10.

[0062] Furthermore, the arrangement of the magnetic barrier groove 213 can increase the gas-liquid flow area, thereby increasing the cooling efficiency of the motor 10.

[0063] Further, the magnetic barrier groove 213 is arranged symmetrically about the symmetry axis of the magnet slot 211; this helps to form a more uniform and symmetrical magnetic field distribution inside the rotor 200. This can reduce the unevenness of the magnetic field, reduce the magnetic leakage and magnetic resistance, and thereby improve the operating efficiency and performance of the motor 10. The symmetrical magnetic barrier groove 213 design can balance the stress situation of the rotor 200 and reduce vibrations and noises caused by uneven magnetic fields. This helps to improve the smoothness and reliability of the motor 10 and prolong the service life of the motor 10. Moreover, the symmetrical arrangement of the magnetic barrier groove 213 and the magnet slot 211 can make the structure of the rotor 200 more balanced and reduce mechanical damage caused by stress concentration. This helps to enhance the mechanical strength of the rotor 200 and improve the overall durability of the motor 10.

[0064] Optionally, in the present embodiment, the minimum inner diameter of the stator 100 is D1, the maximum outer diameter of the stator 100 is D2, and 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 slot ratio of the motor 10. By adjusting the slot 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 slot ratio can reduce mechanical stress and imbalance when the motor 10 is in operation, thereby reducing noise and vibration and improving the smoothness of the motor 10. The present scheme helps to balance the electromagnetic performance of the motor 10, reduce energy loss, improve the efficiency of the motor 10, reduce noise and vibration, and improve the smoothness 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. Within this range, the material of the stator core 110 can be more effectively utilized, and the range has a certain flexibility to adapt to the needs of different types, designs, and application scenarios of the motor 10.

[0065] 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, with reference to Figure 2 .

[0066] In the embodiment, the stator 100 comprises a stator core 110 and a winding 120 wound on the stator core 110, and the wire of the winding 120 adopts a lacquered wire; it can be understood that the insulating layer of the lacquered 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 the current in the winding 120, thereby improving the safety performance of the motor 10. During the operation of the motor 10, the winding 120 of the stator 100 will generate a certain amount of heat. The lacquered wire has high high-temperature resistance and can maintain a stable working state at a 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 be in contact with some corrosive substances such as water, acid and alkali. The lacquered 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 winding 120 of the stator 100 will be subjected to certain mechanical pressure and vibration force. The lacquered 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 lacquered wire as a protective layer of the winding 120 coil can reduce the damage and short circuit of the winding 120 of the stator 100 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 adopt a bare wire without a lacquer.

[0067] Further, in the 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.

[0068] In the embodiment, the stator core 110 comprises a plurality of stator laminations arranged in a stack, a plurality of stator teeth are formed on the plurality of stator laminations, and the winding 120 is wound on the stator teeth. 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 coil, the coil can be wound first and then the stator core 110 is spliced. Thus, the size of the stator 100 slot opening close to the side of the rotor core 210 can be set as small as possible. Since the coil is wound from the slot opening of the stator slot in the integral structure of the stator core 110, the coil can be wound first and then the stator core 110 is spliced in the spliced stator core 110. Thus, the gap of the stator slot opening can be reduced. Ideally, the size of the stator slot opening 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.

[0069] Further, the thickness of the stator laminations of the stator core 110 is the same, and the magnetic conductive material used is the same material.

[0070] Further, the stator laminations are soft magnetic material laminations. Soft magnetic material can achieve a large magnetization intensity with a small external magnetic field. Soft magnetic material has low coercive force and high magnetic permeability, which is conducive to reducing the loss of the stator core 110, i.e. reducing the iron loss of the motor 10, and thus is conducive to improving the performance of the motor 10.

[0071] 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. In addition, the plurality of silicon steel sheets are insulated from each other, which can reduce the overcurrent area and further reduce 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.

[0072] It should be noted that the stator teeth 111 are formed on the plurality of stator laminations. It can be understood 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.

[0073] 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 lamination is 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 lamination is provided as 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.

[0074] 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 lamination is provided with a sub-magnet slot, and when the plurality of rotor laminations are stacked together, the plurality of magnet slots are stacked to form the magnet slot 211.

[0075] Optionally, the rotor lamination is a soft magnetic material lamination, 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 beneficial to reduce the loss of the rotor core 210, that is, reduce the iron loss of the motor 10, and thus is beneficial to improve the performance of the motor 10.

[0076] 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 lamination can also be a neodymium iron boron or a ferrite or other material.

[0077] Further, in an embodiment, the rotor lamination and the stator lamination can be different materials or shapes, so as to meet the needs of different processing techniques of the stator 100 and the rotor 200, which is beneficial to select appropriate laminations to form the rotor core 210 and the stator core 110 according to the performance requirements of the motor 10, and thus ensure good performance of the motor 10, and also improve the wide application range of the motor 10. Of course, the utility model is not limited to this, in 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, so as to facilitate batch production of the laminations and reduce manufacturing cost.

[0078] The utility model also proposes a compressor, the compressor includes motor, the specific structure of the motor refers to the above -mentioned embodiment, because the compressor adopts all technical schemes of the above -mentioned all embodiments, therefore at least has all beneficial effects brought by the technical scheme of the above -mentioned embodiment, here will not repeat again.

[0079] 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.

[0080] 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; and a rotor, which is arranged to rotate in the stator, 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 openings of the magnet grooves being arranged towards an outer circumferential circle of the rotor core, the magnet grooves being symmetrically arranged, each of the magnet grooves being provided with three permanent magnets arranged in a direction along the magnet groove, an included angle between a permanent magnet in the middle and a permanent magnet at an end of the three permanent magnets being α, and an included angle between a line connecting a point closest to the outer circumferential circle of the rotor core of the permanent magnet at the end and a center of the rotor core and an axis of symmetry of the magnet groove being β; a pole pair number of the rotor being P, 1.5≤α / (P×β)≤3.5, 130°≤α≤160°, and 0.8≤β / (57.33° / P)≤1.

3.

2. The electric machine of claim 1, wherein, A width of the permanent magnet at the end in the same magnet groove is L1, and a width of the permanent magnet in the middle is L2, the L1 and the L2 satisfying 0.3≤L2 / L1≤1.

2.

3. The electric machine of claim 1, wherein, An inter-pole air groove is arranged between two adjacent magnet grooves.

4. The electric machine of claim 3, wherein, The inter-pole air groove is in the form of a through groove.

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

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

7. The electric machine of claim 6, wherein, A plurality of magnetic barrier grooves are symmetrically arranged about the axis of symmetry of the magnet groove.

8. The electric machine of claim 1, wherein, A minimum inner diameter of the stator is D1, and a maximum outer diameter of the stator is D2, 0.48≤D1 / D2≤0.

65.

9. The electric machine of any one of claims 1 to 8, wherein, The stator comprises a stator core and a winding arranged on the stator core, 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 in the form of a cuboid.

11. The electric machine of any one of claims 1 to 8, wherein, The stator comprises a stator core, the stator core comprising a plurality of stator laminations arranged in a stacked manner; and / or The rotor core comprises a plurality of rotor laminations arranged in a stacked manner, and the magnet groove is 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 in that, The compressor comprises claim 12.

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