Motor, compressor and refrigeration equipment

Abstract

The invention discloses a motor, a compressor and refrigeration equipment, and relates to the technical field of refrigeration equipment, the motor comprises a motor stator and a motor rotor, the motor stator comprises a stator iron core, the maximum outer circle contour radius of the stator iron core is R1, and the minimum inner circle contour radius of the stator iron core is R2; the area of the cross section of a single stator slot on a plane perpendicular to the axis of the stator core is S1; the area of the cross section of the permanent magnet under a single magnetic pole on a plane perpendicular to the axis of the rotor core is S2; wherein 4 < (R2 / R1) * (S1 / S2) < 5.5. According to the technical scheme provided by the invention, by adjusting the relationship among the maximum outer circle contour radius R1 of the stator core, the minimum inner circle contour radius R2 of the stator core, the area S1 of the stator single slot and the area S2 of the permanent magnet under the single magnetic pole, R2 / R1 and S1 / S2 meet the condition that (R2 / R1) * (S1 / S2) is more than 4 and less than 5.5, so that the copper loss and iron loss of the motor can be balanced, and the efficiency and overload capacity of the motor are improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of refrigeration equipment, and particularly relates to a motor, a compressor and refrigeration equipment. BACKGROUND

[0002] The compressor is the heart of the refrigeration equipment, and high efficiency has always been the focus of research in the compressor industry. The motor, as the power source of the compressor, plays the most important role in energy efficiency performance.

[0003] Motor loss mainly includes copper loss, iron loss, mechanical loss and stray loss. Motor loss not only causes motor heating and reduces motor efficiency, but also limits the overload capacity and service life of the motor. Therefore, it is very important to reduce motor loss and improve motor efficiency. SUMMARY

[0004] The main purpose of the present application is to provide a motor, a compressor and refrigeration equipment, which aims to improve the efficiency and overload capacity of the motor.

[0005] To achieve the above purpose, the motor provided by the present application comprises:

[0006] The motor stator comprises a stator core, the maximum outer contour radius of the stator core is R1, and the minimum inner contour radius of the stator core is R2; the stator core comprises a stator yoke and a plurality of stator teeth, the plurality of stator teeth are arranged at intervals along the inner periphery of the stator yoke, a stator slot is formed between adjacent two stator teeth, and the area of the cross section of a single stator slot in a plane perpendicular to the axis of the stator core is S1;

[0007] The motor rotor is arranged in the inner periphery of the motor stator, the motor rotor comprises a rotor core and a permanent magnet, the rotor core is provided with a plurality of permanent magnet grooves at intervals in the circumferential direction, the permanent magnet is embedded in the permanent magnet groove, so that the rotor core forms a plurality of magnetic poles, and the area of the cross section of the permanent magnet under a single magnetic pole in a plane perpendicular to the axis of the rotor core is S2;

[0008] Wherein, 4<(R2 / R1) x (S1 / S2)<5.5.

[0009] In an embodiment, 0.6<=R1 / R2<=0.65.

[0010] In an embodiment, 0.6<=R1 / R2<=0.62.

[0011] In an embodiment, 40mm<=R1<=95mm.

[0012] In an embodiment, 20mm<=R2<=40mm.

[0013] In an embodiment, 7.1 < S1 / S2 < 10.

[0014] In an embodiment, 100mm 2 ≤ S1 ≤ 400mm 2 .

[0015] In an embodiment, 10mm 2 ≤ S2 ≤ 75mm 2 .

[0016] In an embodiment, a plurality of the permanent magnets form 2P magnetic poles in the circumferential direction of the rotor core, the number of the stator slots is Q, Q and 2P satisfy: 1 < Q / 2P < 3.

[0017] In an embodiment, 15 ≤ Q ≤ 18.

[0018] In an embodiment, 10 ≤ 2P ≤ 12.

[0019] In an embodiment, Q / 2P = 3 / 2.

[0020] In an embodiment, the permanent magnet slot is linear, arc-shaped, V-shaped, U-shaped or W-shaped in a plane perpendicular to the rotor core axis.

[0021] In an embodiment, the permanent magnet slot comprises a plurality of slot segments, each of the slot segments is embedded with one of the permanent magnets, S2 is the sum of the areas of the cross sections of the plurality of the permanent magnets under a single magnetic pole in a plane perpendicular to the rotor core axis.

[0022] The application further provides a compressor comprising the motor.

[0023] The application further provides a refrigeration device comprising the compressor.

[0024] The technical scheme of the application balances the copper loss and iron loss of the motor and improves the efficiency and overload capacity of the motor by adjusting the relationship between the maximum outer contour radius of the stator core R1, the minimum inner contour radius of the stator core R2, the area of the single slot S1 and the area of the permanent magnet under a single magnetic pole S2, so that R2 / R1 and S1 / S2 satisfy: 4 < (R2 / R1) x (S1 / S2) < 5.5. BRIEF DESCRIPTION OF DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings described below only show some of the embodiments of the present application, and all other drawings obtained by those of ordinary skill in the art without creative effort based on these drawings also belong to the protection scope of the present application.

[0026] Figure 1 Structure diagram of an embodiment of the motor provided by the present application;

[0027] Figure 2 Curve of (R2 / R1) x (S1 / S2) and motor efficiency;

[0028] Figure 3 Curve of (R2 / R1) x (S1 / S2) and motor overload capacity;

[0029] Figure 4 Curve of (S1 / S2) and motor efficiency;

[0030] Figure 5 Curve of (S1 / S2) and motor overload capacity.

[0031] Explanation of reference signs:

[0032] 10, motor; 100, motor rotor; 200, motor stator; 110, rotor core; 111, permanent magnet slot; 120, permanent magnet; 210, stator core; 211, stator yoke; 212, stator tooth; 213, stator slot.

[0033] The implementation, functional features and advantages of the present application will be further described with reference to the embodiments and the accompanying drawings. DETAILED DESCRIPTION

[0034] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort belong to 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 position relationship, movement condition, etc. between the components in a certain posture, and if the certain posture changes, the directional indications also change accordingly.

[0036] In addition, if the description of "first", "second" and the like is involved in the embodiments of the present application, 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 technical features indicated or implicitly indicating the number of technical features. Therefore, the features limited by "first", "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 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, nor in the protection scope required by the present application.

[0037] The present application proposes a motor 10.

[0038] Please refer to Figure 1 In an embodiment of the present application, the motor 10 includes a motor stator 200 and a motor rotor 100, the motor stator 200 includes a stator core 210, the maximum outer contour radius of the stator core 210 is R1, and the minimum inner contour radius of the stator core 210 is R2; the stator core 210 includes a stator yoke 211 and a stator tooth 212, a plurality of stator teeth 212 are arranged at intervals along the inner periphery of the stator yoke 211, a stator slot 213 is formed between the adjacent two stator teeth 212, and the area of the cross section of a single stator slot 213 in the plane perpendicular to the axis of the stator core 210 is S1; the motor rotor 100 is arranged in the inner periphery of the motor stator 200, the motor rotor 100 includes a rotor core 110 and a permanent magnet 120, a plurality of permanent magnet grooves 111 are arranged at intervals along the circumferential direction of the rotor core 110, and the permanent magnet 120 is embedded in the permanent magnet groove 111, so that the rotor core 110 forms a plurality of magnetic poles, and the area of the cross section of the permanent magnet 120 under a single magnetic pole in the plane perpendicular to the axis of the rotor core 110 is S2; wherein 4<(R2 / R1)×(S1 / S2)<5.5.

[0039] Specifically, the motor 10 comprises a motor rotor 100 and a motor stator 200, the motor stator 200 is sleeved on the outer periphery of the motor rotor 100. The motor stator 200 comprises a stator core 210 and a stator winding, and is used for generating a rotating magnetic field. The stator core 210 is laminated by silicon steel sheets. The stator core 210 comprises a stator yoke 211 and a plurality of stator teeth 212, the stator yoke 211 is annular, and the plurality of stator teeth 212 are arranged on the inner side of the stator yoke 211 in the circumferential direction of the stator yoke 211. The stator slots 213 are defined between adjacent stator teeth 212, the number of the stator slots 213 is consistent with the number of the stator teeth 212, and the stator winding is directly wound on the stator teeth 212 through the stator slots 213. When the stator winding is connected with three-phase alternating current, a rotating magnetic field is generated, and the permanent magnet 120 on the motor rotor 100 interacts with the rotating magnetic field to generate torque, thereby driving the motor 10 to rotate. The motor rotor 100 comprises a rotor core 110 and a permanent magnet 120, the permanent magnet 120 can generate a constant magnetic field and interact with the rotating magnetic field to generate torque, and the motor rotor 100 can rotate relative to the motor stator 200 to realize normal operation of the motor 10. The rotor core 110 is laminated by high-permeability material or silicon steel punching sheets, has high magnetic flux rate, and has high structural strength and is convenient for processing. The permanent magnet 120 is embedded in the permanent magnet slot 111, and when embedded, it is required that the permanent magnets 120 under the same magnetic pole are of the same polarity in the direction of the outer periphery of the motor rotor 100, and it is required that the magnetic properties of the permanent magnets 120 of adjacent magnetic poles are opposite, and a plurality of magnetic poles are distributed in the circumferential direction of the rotor core 110 in an alternating manner of N pole and S pole.

[0040] The maximum outer circular contour radius of the stator core 210 is R1, that is, the maximum distance from the center of the stator core 210 to the outer edge contour thereof. If the outer periphery of the stator core 210 is a complete circle, it can be directly measured, and the maximum value of the radius of the stator core 210 is R1. If the outer periphery of the stator core 210 is a non-complete circle with grooves, a circle is determined at the three points of the outermost end of the circular arc, and the maximum value of the radius of the stator core 210 is R1.

[0041] The minimum inner circular contour radius of the stator core 210 is R2, that is, the minimum distance from the center of the stator core 210 to the inner edge contour thereof. If the inner periphery of the stator core 210 is a complete circle, it can be directly measured, and the minimum value of the radius of the stator core 210 is R2. If the inner periphery of the stator core 210 is a non-complete circle with grooves, a circle is determined at the three points of the innermost end of the circular arc, and the minimum value of the radius of the stator core 210 is R2.

[0042] The area of the cross section of a single stator slot 213 in a plane perpendicular to the axis of the stator core 210 is the area S1 of the stator single slot, which is formed by the arc formed by the inner wall of the stator slot 213 in the cross section of the plane perpendicular to the axis of the stator core 210 and the straight line connected by the two end points of the slot opening.

[0043] The area of the cross section of the permanent magnet 120 under a single magnetic pole, which is cut by a plane perpendicular to the axis of the rotor core 110, is the area S2 of the permanent magnet 120 under a single magnetic pole. When one permanent magnet 120 is arranged under a single magnetic pole, the area of the cross section of the single permanent magnet 120, which is cut by a plane perpendicular to the axis of the rotor core 110, is S2; when multiple permanent magnets 120 are arranged under a single magnetic pole, the sum of the areas of the cross sections of the multiple permanent magnets 120, which are cut by a plane perpendicular to the axis of the rotor core 110, is S2.

[0044] R2 / R1 is the ratio of the motor 10, in an extreme case, when R2 / R1 is 0, that is, R2 is 0, the motor rotor 100 is not arranged, at this time, the area S1 of the stator single slot is maximum, and the area S2 of the permanent magnet 120 is 0. In another extreme case, when R2 / R1 is 1, that is, R2 = R1, the area S1 of the stator single slot is 0, and the area S2 of the permanent magnet 120 is maximum. In these two extreme cases, the output torque of the motor 10 is also 0, so in the motor 10, the relationship between the area S1 of the stator single slot and the area S2 of the permanent magnet 120 corresponding to different R2 / R1 ratios is studied and proposed to optimize the permanent magnet field and the armature magnetic field, thereby reducing the loss of the motor 10 and improving the energy efficiency and overload capacity of the motor 10.

[0045] According to the experimental results, by adjusting the relationship between the maximum outer radius R1 of the stator core 210, the minimum inner radius R2 of the stator core 210, the area S1 of the stator single slot, and the area S2 of the permanent magnet 120 under a single magnetic pole, so that R2 / R1 and S1 / S2 satisfy: 4 < (R2 / R1) x (S1 / S2) < 5.5, the copper loss and the iron loss of the motor 10 can be balanced, and the efficiency and overload capacity of the motor 10 can be improved.

[0046] When R2 / R1 has a higher ratio, it means that the motor stator 200 has a larger stator inner diameter, so that the radial distance between the inner diameter and the outer diameter of the stator core 210 is smaller, that is, the stator core 210 is thinner in the radial direction. The thinner stator core 210 has lower structural strength, and the thinner stator core 210 will cause greater eddy current, thereby increasing the eddy current loss (eddy current is an induced current generated inside the conductor in a changing magnetic field, which generates heat), thereby reducing the efficiency and overload capacity of the motor 10.

[0047] R2 / R1 has a higher ratio, it also means that the stator core 210 has a smaller stator outer diameter. The change of the inner diameter of the stator core 210 will affect the magnetic flux density of the stator core 210. Under the condition of the same magnetic flux, a smaller stator outer diameter will cause the magnetic flux density of the stator core 210 to increase sharply, and the iron loss of the stator core 210 is positively correlated with the size of the magnetic flux density in an exponential coefficient, thereby increasing the iron loss (mainly hysteresis loss and eddy current loss) of the stator core 210 and reducing the efficiency of the motor 10. In addition, the size of the inner diameter of the stator core 210 directly determines the size of the air gap between the stator and the rotor. A larger air gap will result in higher magnetic resistance, thereby increasing the iron loss and copper loss and reducing the efficiency of the motor 10, and also reducing the starting torque and maximum torque of the motor 10.

[0048] The area S1 of the single slot of the stator determines the arrangement of the number of windings in the stator slot 213. More stator windings arranged in the stator slot 213 help to improve the peak current and carrying capacity of the motor 10, thereby improving the efficiency and overload capacity of the motor 10, but at the same time, it will also cause the increase of the winding resistance, thereby increasing the copper loss and affecting the efficiency of the motor 10.

[0049] The area S2 of the permanent magnet 120 under a single magnetic pole directly affects the size and distribution of the magnetic flux. A larger area of the permanent magnet 120 means that more magnetic flux can pass through the stator core 210, which helps to improve the output power of the motor 10. However, if the magnetic flux is too large, it will cause the magnetic circuit to be saturated, increase the iron loss (hysteresis loss and eddy current loss), and thus reduce the efficiency of the motor 10.

[0050] When the copper loss in the area S1 of the single slot of the stator and the iron loss in the area S2 of the permanent magnet 120 under a single magnetic pole are balanced, the efficiency of the motor 10 is the highest. By exploring the relationship between R2 / R1 and S1 / S2 under different ratios of R2 / R1, the copper loss and iron loss of the motor 10 can be balanced, thereby improving the efficiency and overload capacity of the motor 10.

[0051] Please refer to Table 1 and Figure 2 With the increase of (R2 / R1) x (S1 / S2), the efficiency of the motor 10 first gradually increases and then gradually decreases. When 4 < (R2 / R1) x (S1 / S2) < 5.5, the efficiency of the motor 10 is higher than 93.4%. Among them, when (R2 / R1) x (S1 / S2) = 4.8, the efficiency of the motor 10 reaches the highest, which is 95%.

[0052] Please refer to Table 1 and Figure 3With the increase of (R2 / R1) x (S1 / S2), the overload capacity of the motor 10 gradually increases first and then gradually decreases. When 4 < (R2 / R1) x (S1 / S2) < 5.5, the overload capacity of the motor 10 is higher than 1.15 times. When (R2 / R1) x (S1 / S2) = 4.8, the overload capacity of the motor 10 reaches the highest, which is 1.5 times.

[0053] Table 1: Relationship table of (R2 / R1) x (S1 / S2) and motor efficiency, overload capacity multiple

[0054] (R2 / R1) x (S1 / S2) Motor efficiency / % Overload capability multiple 3.6 92.4 0.8 3.8 92.9 0.95 4 93.4 1.15 4.2 93.8 1.3 4.6 94.6 1.45 4.8 95 1.5 5 94.8 1.45 5.2 94.2 1.35 5.5 93.4 1.15 5.7 92.9 0.97 6 92.4 0.8

[0055] In an embodiment, 0.6 ≤ R1 / R2 ≤ 0.65.

[0056] When R1 / R2 ≥ 0.65, it can cause the thickness of the stator core 210 to be too thin, so that the structural strength of the stator core 210 is low; it can also cause the outer diameter of the stator core 210 to be too small, which limits the size and number of the winding, thereby affecting the peak current carrying capacity of the motor 10. When R1 / R2 ≤ 0.6, it can cause the thickness of the stator core 210 to be too thick, thereby increasing the eddy current loss and reducing the efficiency and overload capacity of the motor 10; it can also cause the outer diameter of the stator core 210 to be too large, thereby increasing the magnetic resistance and increasing the iron loss, thereby reducing the efficiency of the motor 10. Therefore, when 0.6 ≤ R1 / R2 ≤ 0.65, the stator core 210 has a suitable thickness, that is, it ensures that the stator core 210 has a certain structural strength, and reduces the iron loss, thereby improving the efficiency and overload capacity of the motor 10.

[0057] In an embodiment, 0.6 ≤ R1 / R2 ≤ 0.62.

[0058] Further, 0.6 ≤ R1 / R2 ≤ 0.62 can further optimize the thickness and the size of the inner and outer diameters of the stator core 210, ensure that the stator core 210 has a certain structural strength, and reduce the iron loss of the motor stator 200, thereby improving the efficiency and overload capacity of the motor 10.

[0059] In an embodiment, the maximum outer circle contour radius of the stator core 210 is R1, and 40 mm ≤ R1 ≤ 95 mm.

[0060] When R1>95mm, the inner diameter of the stator core 210 is too large, which increases the iron loss of the motor stator 200 and reduces the efficiency of the motor 10. Meanwhile, the volume and weight of the motor stator 200 are too large. When R1<40mm, the inner diameter of the stator core 210 is too small, which limits the size and number of the windings, thereby affecting the peak current carrying capacity of the motor 10. Meanwhile, it also limits the size of the motor rotor 100, thereby reducing the efficiency of the motor 10. When 40mm≤R1≤95mm, the size of the stator core 210 is more reasonable, i.e., the stator core 210 has certain structural strength, and the iron loss is reduced, thereby improving the efficiency and overload capacity of the motor 10. Further, 45mm≤R1≤55mm.

[0061] In an embodiment, the minimum inner circle profile radius of the stator core 210 is R2, and 20mm≤R2≤40mm.

[0062] When R2>40mm, the outer diameter of the stator core 210 is too large, which increases the iron loss of the motor stator 200 and reduces the efficiency of the motor 10. Meanwhile, the volume and weight of the motor stator 200 are too large. When R2<20mm, the number and size of the windings can be limited, thereby affecting the overload capacity. When 20mm≤R2≤40mm, the size of the stator core 210 is more reasonable, i.e., the stator core 210 has certain structural strength, and the iron loss is reduced, thereby improving the efficiency and overload capacity of the motor 10. Further, 25mm≤R2≤35mm.

[0063] In an embodiment, 7.1<S1 / S2<10.

[0064] By limiting the ratio of S1 / S2, the copper loss in the area S1 of the stator single slot and the iron loss in the area S2 of the permanent magnet 120 under the single magnetic pole are balanced, thereby improving the efficiency and overload capacity of the motor 10.

[0065] Please refer to Table 2 and Figure 4 With the increase of S1 / S2, the efficiency of the motor 10 gradually increases first and then gradually decreases. When 7.1<S1 / S2<10, the efficiency of the motor 10 is higher than 94%. Among them, when 8<S1 / S2<9, the efficiency of the motor 10 is further improved, which is higher than 95%.

[0066] Please refer to Table 2 and Figure 5 With the increase of S1 / S2, the overload capacity of the motor 10 gradually increases first and then gradually decreases. When 7.1<S1 / S2<10, the overload capacity of the motor 10 is higher than 1.15 times. Among them, when 8<S1 / S2<9, the overload capacity of the motor 10 is further improved, which is higher than 1.5 times.

[0067] Table 2: Relationship between S1 / S2 and motor efficiency, overload capacity multiple

[0068]

[0069]

[0070] Further, 7.2 < S1 / S2 < 7.8.

[0071] In an embodiment, the area of the cross section of the single stator slot 213 taken in a plane perpendicular to the axis of the stator core 210 is S1, 100 mm 2 ≤ S1 ≤ 400 mm 2 .

[0072] When S1 > 400 mm 2 , the excessive winding resistance increases the copper loss, which affects the efficiency of the motor 10. When S1 < 100 mm 2 , the number of windings in the stator slot 213 is small, which is not conducive to improving the peak current and carrying capacity of the motor 10. When 100 mm 2 ≤ S1 ≤ 400 mm 2 , the efficiency and carrying capacity of the motor 10 can be improved. Further, 130 mm 2 ≤ S1 ≤ 150 mm 2 .

[0073] In an embodiment, the area of the cross section of the permanent magnet 120 under a single magnetic pole taken in a plane perpendicular to the axis of the rotor core 110 is S2, 10 mm 2 ≤ S2 ≤ 75 mm 2 .

[0074] When S2 > 75 mm 2 , the excessive magnetic flux causes magnetic circuit saturation, increases the iron loss (hysteresis loss and eddy current loss), and thus reduces the efficiency of the motor 10. When S2 < 10 mm 2 , the magnetic flux passing through the stator core 210 is small, which is not conducive to improving the output power of the motor 10. When 10 mm 2 ≤ S2 ≤ 75 mm 2 , it ensures that more magnetic flux passes through the stator core 210, and reduces the risk of magnetic circuit saturation, thereby improving the efficiency of the motor 10. Further, 15 mm 2 ≤ S2 ≤ 22 mm 2 .

[0075] In an embodiment, the plurality of permanent magnets 120 form 2P magnetic poles in the circumferential direction of the rotor core 110, and 1 < Q / 2P < 3.

[0076] 2P is the number of magnetic poles formed in the circumferential direction of the rotor core 110, and P is the number of magnetic pole pairs of the motor rotor 100. The ratio of Q / 2P has different effects on the waveform quality of the back EMF and the cogging torque, thereby having important influences on the back EMF characteristics and the energy efficiency of the motor 10. Higher waveform quality and lower cogging torque help to reduce energy loss. Therefore, in order to reduce the tooth harmonic magnetic field and reduce torque fluctuation, the number of stator slots 213 and the number of magnetic pole pairs are usually optimized.

[0077] The ratio of Q / 2P determines the magnetic field interaction between the motor stator 200 and the motor rotor 100, and different slot ratios will affect the fundamental magnetic flux density distribution of the motor 10, thereby affecting the performance of the motor 10. When there is no good cooperation between the two, higher tooth harmonics may be generated, resulting in additional losses and torque fluctuations, thereby affecting the efficiency and noise level of the motor 10. When 1

[0078] In an embodiment, the number of stator slots 213 is Q, and 15≤Q≤18.

[0079] A larger number of stator slots 213 can reduce the magnetic resistance, increase the magnetic flux, help to improve the efficiency of the motor 10, evenly distribute the magnetic flux, reduce the cogging effect, help to reduce the cogging torque, improve the waveform quality of the back EMF, make it closer to the ideal sine waveform, improve the magnetic flux distribution, reduce torque fluctuations caused by the interaction between the magnetic poles, and improve the anti-demagnetization capability. However, at the same time, a larger number of slots may require more space, thereby increasing the volume or weight of the motor 10, thereby reducing the power density, and increasing the manufacturing cost. When 15≤Q≤18, the magnetic flux distribution can be optimized, the waveform quality of the back EMF can be improved, the cogging torque and torque fluctuation can be reduced, the anti-demagnetization capability can be improved, the efficiency and overload capability of the motor 10 can be improved, and the volume and manufacturing cost of the motor 10 can be controlled.

[0080] In an embodiment, the plurality of permanent magnets 120 form 2P magnetic poles in the circumferential direction of the rotor core 110, and 10≤2P≤12.

[0081] More magnetic pole numbers can increase the complexity of the magnetic circuit, but also increase the total cross-sectional area of the magnetic circuit, which helps to increase the magnetic flux; can better disperse the magnetic flux, thereby reducing the sudden change of the magnetic flux density, reducing the cogging effect, which helps to reduce the cogging torque; can improve the waveform quality of the back EMF, making it closer to the ideal sine waveform; can improve the magnetic flux distribution, reduce the torque fluctuation caused by the interaction between the magnetic poles, and improve the anti-demagnetization ability. But at the same time, it may also increase the space required by more slots, thereby increasing the volume or weight of the motor 10, thereby reducing the power density, and at the same time, more magnetic pole numbers will also increase the production cost. When 10≤2P≤12, the volume and manufacturing cost of the motor 10 can be controlled while optimizing the magnetic flux distribution, improving the waveform quality of the back EMF, reducing the cogging torque and torque fluctuation, improving the anti-demagnetization ability, improving the efficiency and overload capacity of the motor 10.

[0082] In an embodiment, Q / 2P=3 / 2.

[0083] By limiting the ratio of the number of stator slots 213 to the number of magnetic poles of the motor rotor 100 to 3 / 2, the volume and manufacturing cost of the motor 10 can be controlled while optimizing the magnetic flux distribution, improving the waveform quality of the back EMF, reducing the cogging torque and torque fluctuation, improving the anti-demagnetization ability, improving the efficiency and overload capacity of the motor 10. In an embodiment, the number of stator slots 213 is 15, and the number of magnetic poles of the motor rotor 100 is 10. In another embodiment, the number of stator slots 213 is 18, and the number of magnetic poles of the motor rotor 100 is 12.

[0084] In an embodiment, the permanent magnet slot 111 is linear, arc-shaped, "V"-shaped, "U"-shaped, or "W"-shaped in a plane perpendicular to the axis of the rotor core 110.

[0085] The permanent magnet slot 111 can be linear, arc-shaped, "U"-shaped, "V"-shaped or "W"-shaped, wherein a linear permanent magnet slot 111 is correspondingly embedded with a linear permanent magnet 120; an arc-shaped permanent magnet slot 111 is correspondingly embedded with an arc-shaped permanent magnet 120. The "U"-shaped, "V"-shaped or "W"-shaped permanent magnet slot 111 is combined and embedded with linear or arc-shaped permanent magnets 120. The "V"-shaped permanent magnet slot 111 is embedded with two linear permanent magnets 120, and the two permanent magnets 120 correspond to the "V"-shaped permanent magnet slot 111. The "U"-shaped permanent magnet slot 111 is embedded with two linear permanent magnets 120 and an arc-shaped permanent magnet 120, so that the three permanent magnets 120 correspond to the "U"-shaped permanent magnet slot 111. Of course, the permanent magnet slot 111 can also be inverted trapezoidal, and the inverted trapezoidal permanent magnet slot 111 is embedded with three linear permanent magnets 120, so that the three permanent magnets 120 correspond to the inverted trapezoidal permanent magnet slot 111. The "W"-shaped permanent magnet slot 111 is embedded with four linear permanent magnets 120, and the four permanent magnets 120 correspond to the "W"-shaped permanent magnet slot 111.

[0086] In an embodiment, the permanent magnet slot 111 comprises a plurality of slot segments, each of which is embedded with a permanent magnet 120, and S2 is the sum of the areas of the cross sections of the plurality of permanent magnets 120 under a single magnetic pole in a plane perpendicular to the axis of the rotor core 110.

[0087] The linear and arc-shaped permanent magnet slot 111 is correspondingly embedded with one permanent magnet 120, and S2 is the area of the cross section of the permanent magnet 120 in a plane perpendicular to the axis of the rotor core 110.

[0088] The "V"-shaped permanent magnet slot 111 is embedded with two permanent magnets 120, and S2 is the sum of the areas of the cross sections of the two permanent magnets 120 in a plane perpendicular to the axis of the rotor core 110.

[0089] The "U"-shaped permanent magnet slot 111 is embedded with three permanent magnets 120, and S2 is the sum of the areas of the cross sections of the three permanent magnets 120 in a plane perpendicular to the axis of the rotor core 110.

[0090] The "W"-shaped permanent magnet slot 111 is embedded with four permanent magnets 120, and S2 is the sum of the areas of the cross sections of the four permanent magnets 120 in a plane perpendicular to the axis of the rotor core 110.

[0091] The application further provides a compressor, which comprises the motor 10, the specific structure of which is referred to the above-mentioned embodiments, and the compressor in the technical scheme of the application adopts all the technical schemes of the above-mentioned embodiments, so it has all the beneficial effects brought by the technical schemes of the above-mentioned embodiments, which will not be repeated here.

[0092] The application further provides a refrigeration equipment, which comprises the compressor, the specific structure of which is referred to the above-mentioned embodiments, and the refrigeration equipment can be divided into compression refrigeration equipment, absorption refrigeration equipment, vapor injection refrigeration equipment, heat pump refrigeration equipment and electric heating refrigeration device, etc. The refrigeration equipment mainly comprises a compressor, an expansion valve, an evaporator, a condenser and accessories, a pipeline, etc. Such as a refrigerator, an air conditioner, etc. The compressor in the technical scheme of the application adopts all the technical schemes of the above-mentioned embodiments, so it has all the beneficial effects brought by the technical schemes of the above-mentioned embodiments, which will not be repeated here.

[0093] The above-mentioned is only the exemplary embodiment of the application, and does not limit the patent scope of the application, and any equivalent structural transformation, direct / indirect application in other related technical fields by using the content of the specification and drawings of the application are included in the patent protection scope of the application.

Claims

1. An electric motor, characterized in that, include: The motor stator includes a stator core, wherein the maximum outer radius of the stator core is R1 and the minimum inner radius of the stator core is R2; the stator core includes a stator yoke and stator teeth, wherein a plurality of stator teeth are spaced apart along the inner circumference of the stator yoke, and a stator slot is formed between two adjacent stator teeth, wherein the area of ​​the cross section of a single stator slot in a plane perpendicular to the axis of the stator core is S1; The motor rotor passes through the inner circumference of the motor stator. The motor rotor includes a rotor core and permanent magnets. The rotor core is provided with a plurality of permanent magnet slots spaced apart along its circumference. The permanent magnets are embedded in the permanent magnet slots so that the rotor core forms a plurality of magnetic poles. The area of ​​the cross-section of the permanent magnet under a single magnetic pole in a plane perpendicular to the axis of the rotor core is S2. Wherein, 4 < (R2 / R1) × (S1 / S2) < 5.

5.

2. The motor as described in claim 1, characterized in that, 0.6≤R1 / R2≤0.

65.

3. The motor as described in claim 2, characterized in that, 0.6≤R1 / R2≤0.

62.

4. The motor as described in claim 1, characterized in that, 40mm≤R1≤95mm; And / or, 20mm≤R2≤40mm.

5. The motor as described in claim 1, characterized in that, 7.1 < S1 / S2 < 10.

6. The motor as described in claim 5, characterized in that, 100mm 2 ≤S1≤400mm 2 ; And / or, 10mm 2 ≤S2≤75mm 2 .

7. The motor as described in claim 1, characterized in that, The permanent magnets form 2P magnetic poles in the circumferential direction of the rotor core, and the number of stator slots is Q, where Q and 2P satisfy: 1 ​​< Q / 2P < 3.

8. The motor as described in claim 7, characterized in that, 15≤Q≤18。 9. The motor as described in claim 7, characterized in that, 10≤2P≤12。 10. The motor as described in claim 7, characterized in that, Q / 2P = 3 / 2.

11. The motor as described in claim 1, characterized in that, The permanent magnet slots are in the form of a straight line, an arc, a "V" shape, a "U" shape, or a "W" shape on a plane perpendicular to the axis of the rotor core.

12. The motor as described in claim 11, characterized in that, The permanent magnet slot includes multiple slot segments, and each slot segment is embedded with a permanent magnet. S2 is the sum of the areas of the cross sections of the multiple permanent magnets under a single magnetic pole in a plane perpendicular to the axis of the rotor core.

13. A compressor, characterized in that, Including the motor as described in any one of claims 1 to 12.

14. A refrigeration device, characterized in that, Includes the compressor as described in claim 13.

Images