Electric machine, compressor and refrigeration plant

Abstract

The application discloses a motor, a compressor and a refrigeration device, and relates to the technical field of compressors, wherein the motor comprises a stator and a rotor, the stator is provided with a plurality of stator slots, and the number of the stator slots is Q; the rotor is arranged on the inner side of the stator; wherein the rotor pole number of the rotor lamination is 2P, the maximum distance from the outer edge of the rotor lamination to the center of the rotor is Ro, the minimum distance from the outer edge of the rotor lamination to the center of the rotor is Ri, the magnet slot has a first end point and a second end point closest to the outer edge of the rotor lamination, the included angle between the first end point and the second end point and the center of the rotor is alpha, the angle occupied by each magnetic pole on the rotor lamination is beta, 0.03mm<=Ro<=0.1mm, 0.12<=Ri<=0.15; the technical scheme provided by the application can improve the energy efficiency of the motor.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of compressors, in particular to a motor, a compressor and a refrigeration device. BACKGROUND

[0002] At present, with the rapid development of economic level and the improvement of people's living standard, miniaturization, high efficiency and low noise are increasingly becoming the demands of people in the field of compressors. The existing motor has high torque ripple, which leads to poor stability, high vibration and noise level of the motor operation, and thus reduces the overall efficiency. SUMMARY

[0003] The main purpose of the present application is to provide a motor, a compressor and a refrigeration device, which aims to improve the energy efficiency of the motor.

[0004] To achieve the above purpose, the motor provided by the present application comprises:

[0005] a stator provided with a plurality of stator slots, the number of stator slots being Q;

[0006] a rotor provided on the inner side of the stator, the rotor comprising a plurality of rotor laminations stacked along the axial direction thereof, and the rotor laminations being distributed with a plurality of magnet slots along the circumferential direction thereof;

[0007] wherein the rotor pole number of the rotor lamination is 2P, the maximum distance from the outer edge of the rotor lamination to the rotor center is Ro, the minimum distance from the outer edge of the rotor lamination to the rotor center is Ri, the magnet slot has a first end point closest to the outer edge of the rotor lamination and a second end point, the included angle between the first end point and the second end point and the rotor center is a, the angle occupied by each magnetic pole on the rotor lamination is b, 0.03mm≤ ≤0.1mm, 0.12≤ ≤0.15.

[0008] In an embodiment, 0.5mm≤Ro-Ri≤1.5mm.

[0009] In an embodiment, 23°≤a≤26°.

[0010] In an embodiment, the minimum distance from the magnet slot to the rotor center is L, the magnet slot comprises two inclined slot segments arranged at an angle, the two inclined slot segments are arranged close to each other in the direction away from the outer edge of the rotor lamination, the included angle between the two inclined slot segments is g, 16°≤ ≤19°, 12°≤b- ≤14°.

[0011] In an embodiment, 110°≤g≤120°.

[0012] In an embodiment, 0.73≤ ≤0.79.

[0013] In an embodiment, 5≤GCD(Q, P)≤6.

[0014] In an embodiment, 1.4≤Q / 2P≤1.6.

[0015] In an embodiment, Q=15, and P=5.

[0016] In an embodiment, two buckle holes are arranged on the magnetic pole of the rotor lamination, and the two buckle holes are arranged on opposite sides of the magnet slot along the radial direction of the rotor lamination.

[0017] In an embodiment, the rotor lamination is provided with an axis hole concentric with the rotation center of the rotor, and the diameter of the axis hole is D, and 19mm≤D≤22mm.

[0018] The application also provides a compressor comprising the motor described above.

[0019] The application also provides a refrigeration device comprising the compressor described above.

[0020] In the technical scheme of the application, the motor comprises a stator and a rotor arranged inside the stator, the rotor comprises a plurality of rotor laminations, and each rotor lamination is arranged in an axial direction, wherein the rotor lamination is provided with a plurality of magnet slots, the magnet slot has a first end point closest to the outer edge of the rotor lamination and a second end point, and further, by limiting the number Q of stator slots, the number 2P of rotor poles of the rotor lamination, the maximum distance Ro from the outer edge of the rotor lamination to the center of the rotor, the minimum distance Ri from the outer edge of the rotor lamination to the center of the rotor, the angle α formed by the first end point and the second end point with the center of the rotor, and the angle β occupied by each magnetic pole on the rotor lamination, the following conditions are met: 0.03mm≤ ≤0.1mm, 0.12≤ ≤0.15; in this way, the outer edge part of the rotor lamination is arranged in a concave manner, forming a non-uniform air gap, by reasonably limiting the values of 、 , changing the shape and position, guiding or blocking the magnetic flux path, achieving the effect of adjusting the magnetic field, and further reliably optimizing the distribution of the air gap magnetic field, reducing the harmonic content, improving the sinusoidal degree of the air gap magnetic field, reducing the torque ripple of the motor, thereby improving the efficiency of the motor and improving the overall efficiency of the motor. BRIEF DESCRIPTION OF DRAWINGS

[0021] 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 required by the embodiments or the prior art description. Obviously, the drawings described below only show some of the embodiments of the present application, and the ordinary skilled in the art can obtain other drawings from the structures shown in the drawings without any creative effort.

[0022] Figure 1 The structural schematic diagram of an embodiment of the motor provided by the present application is shown in the figure.

[0023] Explanation of reference numerals:

[0024] 10, rotor lamination; 11, magnet slot; 111, first end point; 112, second end point; 113, inclined slot section; 12, shaft hole; 13, buckle hole.

[0025] The implementation, functional features and advantages of the present application will be further described with reference to the embodiments and the drawings. DETAILED DESCRIPTION

[0026] 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, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by the ordinary skilled in the art without any creative effort are within the scope of protection of the present application.

[0027] 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 will also change accordingly.

[0028] 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 of the indicated technical features or implicitly indicating the number of the indicated technical features. Therefore, the features limited by “first”, “second” can explicitly or implicitly include at least one of the features. In addition, “and / or” or “and / or” appears throughout the text, which means that the three parallel schemes are included, for example, “A and / or B” includes A scheme, or B scheme, or A and B are satisfied at the same time. In addition, the technical solutions of each embodiment can be combined with each other, but it must be based on the fact that the ordinary skilled in the art can realize it, and 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 scope of protection claimed by the present application.

[0029] At present, with the rapid development of economic level and the improvement of people's living standards, miniaturization, high efficiency and low noise are increasingly becoming the demands of people in the field of compressor. The existing motor has high torque ripple, which leads to poor stability, high vibration and noise level of the motor operation, and thus reduces the overall machine efficiency.

[0030] In order to solve the technical problem, the application provides a motor.

[0031] Please refer to Figure 1 In an embodiment of the application, the motor comprises a stator and a rotor, the stator is provided with a plurality of stator slots, the number of the stator slots is Q; the rotor is arranged on the inner side of the stator, the rotor comprises a plurality of rotor laminations 10 stacked along the axial direction thereof, and a plurality of magnet slots 11 are distributed along the circumferential direction of the rotor lamination 10; wherein the rotor pole number of the rotor lamination 10 is 2P, the maximum distance from the outer edge of the rotor lamination 10 to the center of the rotor is Ro, the minimum distance from the outer edge of the rotor lamination 10 to the center of the rotor is Ri, the magnet slot 11 has a first end point 111 closest to the outer edge of the rotor lamination 10 and a second end point 112, the included angle between the first end point 111 and the second end point 112 and the center of the rotor is a, and the angle occupied by each magnetic pole on the rotor lamination 10 is β, 0.03mm≤ ≤0.1mm, 0.12≤ ≤0.15; so as to improve the overall machine efficiency.

[0032] In the technical scheme of the application, the motor comprises a stator and a rotor arranged on the inner side of the stator, the rotor comprises a plurality of rotor laminations 10, and each rotor lamination 10 is arranged in a stacked manner along the axial direction thereof, wherein the rotor lamination 10 is provided with a plurality of magnet slots 11, the magnet slot 11 has a first end point 111 closest to the outer edge of the rotor lamination 10 and a second end point 112, and further, by limiting the number Q of stator slots, the rotor pole number 2P of the rotor lamination 10, the maximum distance Ro from the outer edge of the rotor lamination 10 to the center of the rotor, the minimum distance Ri from the outer edge of the rotor lamination 10 to the center of the rotor, the included angle a between the first end point 111 and the second end point 112 and the center of the rotor, and the angle β occupied by each magnetic pole on the rotor lamination 10 satisfy: 0.03mm≤ ≤0.1mm, 0.12≤ ≤0.15; in this way, the outer edge part of the rotor lamination 10 is arranged in a recessed manner, forming a non-uniform air gap, by reasonably limiting 、 the values, changing the shape and position, guiding or blocking the magnetic flux path, realizing the magnetic adjustment effect, and thus reliably optimizing the distribution of the air gap magnetic field, reducing the harmonic content, improving the sinusoidal degree of the air gap magnetic field, reducing the torque ripple of the motor, thereby improving the motor efficiency and improving the overall machine efficiency.

[0033] Specifically, by determining the recess depth of the outer edge of the rotor lamination 10, i.e. the size of the air gap, in combination with the number of stator slots, the motor performance is reasonably optimized. When is greater than 0.1 mm, the air gap range is prone to be large, resulting in uneven magnetic field distribution and uneven current distribution, which not only causes torque ripple, increases mechanical vibration and noise, reduces motor operation accuracy and reliability, but also increases iron loss and copper loss, reduces motor efficiency, and deteriorates energy efficiency; when is less than 0.03 mm, the air gap range is small, limiting the amplitude of adjusting the magnetic field strength, i.e. the operable space of the magnetic adjustment is small, which is prone to cause unsatisfactory magnetic adjustment effect.

[0034] Therefore, by limiting to be between 0.03 mm and 0.1 mm, the unevenness of the air gap can be reliably controlled, which can not only be effectively dispersed by the reasonable distribution of the number of stator slots to reduce local distortion of the magnetic field, reduce torque ripple, reduce vibration and noise, improve the operation stability and accuracy of the motor, but also effectively optimize the magnetic field distribution, reduce iron loss and copper loss, and improve motor efficiency and motor energy efficiency.

[0035] wherein, the specific value of includes but is not limited to 0.03 mm, 0.04 mm, 0.05 mm, 0.06 mm, 0.07 mm, 0.08 mm, 0.09 mm, 0.1 mm. In other embodiments, on the basis of ensuring motor performance, may be greater than 0.1 mm, or less than 0.03 mm.

[0036] The angle β occupied by each magnetic pole on the rotor lamination 10 refers to the central angle occupied by each magnetic pole on the rotor circumference; and the line connecting the first endpoint 111 and the rotor center and the line connecting the second endpoint 112 and the rotor center form an included angle α, which can determine the central angle occupied by the magnet slot 11 on the corresponding magnetic pole; is the greatest common divisor of the number of stator slots Q and the rotor pole number 2P of the rotor lamination 10, which can make the magnetic field distribution of the motor more uniform and symmetrical, reduce harmonic loss, and improve motor efficiency.

[0037] Through the angle design of the magnetic pole and the magnet slot 11, in combination with the greatest common divisor of the number of stator slots and the rotor pole number, the motor performance can be reasonably optimized. When is greater than 0.15, the magnet slot 11 will occupy most of the area of the magnetic pole, resulting in uneven magnetic field distribution, which will increase the torque ripple of the motor, reduce the motor efficiency, and also weaken the mechanical strength of the magnetic pole, which is prone to deformation or loss under the action of electromagnetic force and centrifugal force, reducing the operation stability and reliability of the motor; when When the value of the ratio is less than 0.12, the size of the magnet slot 11 is too small, the number and installation position of the magnets are limited, and the effective area of the magnetic pole is relatively large, which can easily lead to uneven distribution of the magnetic field phase, affect the phase balance of the motor, increase the harmonic content, and thus introduce additional loss and vibration, and reduce the output power and efficiency of the motor.

[0038] Therefore, by limiting the value of the ratio to be between 0.12 and 0.15, the magnet slots 11 in the magnetic pole can reasonably distribute the magnetic field, so that the magnetic field strength is uniformly distributed within the magnetic pole range, which can effectively reduce the torque ripple, reduce the harmonic content, reduce the loss and noise of the motor, and thus improve the motor efficiency and motor efficiency.

[0039] wherein the specific value of the ratio includes but is not limited to 0.12, 0.13, 0.14, and 0.15. In other embodiments, on the basis of ensuring the performance of the motor, may be greater than 0.15 or less than 0.12.

[0040] Alternatively, in embodiments of the present application, 0.5mm≤Ro-Ri≤1.5mm, wherein Ro-Ri represents the difference between the maximum distance from the outer edge of the rotor lamination 10 to the center of the rotor and the minimum distance from the outer edge of the rotor lamination 10 to the center of the rotor, which can also be expressed as the radial depth of the air gap. When Ro-Ri is greater than 1.5mm, i.e., the air gap is too deep, it can easily increase the air gap reluctance, reduce the air gap magnetic field strength, and also easily lead to increased magnetic leakage, thereby reducing the effective utilization of the magnetic field and thus reducing the output power and efficiency of the motor; when Ro-Ri is less than 0.5mm, i.e., the air gap is too shallow, the magnetic adjustment effect is not obvious, which cannot effectively improve the air gap magnetic field distribution or reduce the cogging torque, and can easily increase the cost and processing difficulty.

[0041] Therefore, by limiting the difference Ro-Ri to be between 0.5mm and 1.5mm, the air gap magnetic field distribution can be effectively optimized while ensuring the magnetic adjustment effect, the harmonic content can be reduced, the sine degree of the air gap magnetic field can be improved, the cogging torque and torque ripple can be reduced, the motor efficiency can be improved, and the overall energy efficiency can be optimized.

[0042] wherein the specific value of Ro-Ri includes but is not limited to 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 0.1mm, 0.11mm, 0.12mm, 0.13mm, 0.14mm, and 0.15mm. In other embodiments, on the basis of the magnetic adjustment effect, Ro-Ri can be greater than 1.5mm or less than 0.5mm.

[0043] ​​Optionally, in the embodiments of the present application, 23°≤a≤26°, wherein the first end point 111 and the second end point 112 are both arranged close to the outer edge of the rotor lamination 10, and the distance from the two end points to the rotor center is larger than that from other reference points on the magnet slot 11 to the rotor center, and the angle a between the line connecting the first end point 111 and the rotor center and the line connecting the second end point 112 and the rotor center represents the angle of the magnet slot 11 on the magnetic pole.

[0044] When a is greater than 26°, the larger angle a will cause the effective magnetic flux area of the magnetic pole to decrease, the magnetic field distribution to be uneven, the torque ripple to increase, the loss and noise to increase, the harmonic content to increase, and thus the motor efficiency to decrease and the energy efficiency to deteriorate; when a is less than 23°, the smaller angle a will limit the distribution of the magnet, cause the magnetic field distribution to be uneven, and thus easily increase the torque ripple, increase the loss and noise, increase the harmonic content, and thus decrease the motor efficiency and deteriorate the energy efficiency.

[0045] Therefore, limiting the angle a between 23° and 26° can ensure that the magnetic field is uniformly distributed in the magnetic pole, reduce the unevenness of the magnetic field, and thus reduce the torque ripple, reduce the harmonic content, reduce the loss and noise, and thus improve the motor efficiency and improve the overall energy efficiency.

[0046] Specific values of the angle a include but are not limited to 23°, 24°, 25°, and 26°.

[0047] Optionally, in the embodiments of the present application, the minimum distance from the magnet slot 11 to the rotor center is L, the magnet slot 11 includes two inclined slot segments 113 arranged at an angle, the two inclined slot segments 113 are arranged close to each other in a direction away from the outer edge of the rotor lamination 10, the angle between the two inclined slot segments 113 is γ, 16°≤γ≤19°, and 12°≤β≤14°, and thus the performance and efficiency of the motor can be improved by reasonably adjusting the motor parameters.

[0048] Specifically, represents the comprehensive parameter of the geometric shape feature of the magnet slot 11 and the radial position thereof; is the greatest common divisor of the number Q of sub-slots and the rotor pole number 2P of the rotor lamination 10, and thus by adjusting , the magnetic field distribution of the motor can be more uniform and symmetrical, the magnetic field distortion and electromagnetic loss can be reduced, the harmonic distribution in the motor can be controlled, and thus the motor efficiency can be improved, and the running stability and reliability of the motor can be improved.

[0049] When is greater than 19°, the magnetic field distribution is easily uneven, the magnetic field distortion is easily increased, the harmonic loss is easily increased, the motor efficiency is easily decreased, and the torque ripple is easily increased, which affects the smooth running of the motor; when​​ When less than 16°, it is easy to cause the magnetic field strength of the magnet slot 11 to be insufficient, affecting the motor efficiency, and in order to compensate for the deficiency, the number or volume of the magnet needs to be increased, which is easy to increase the weight and cost of the motor.

[0050] Therefore, the angle α is limited to be between 16° and 19°. When the angle α is limited to be between 16° and 19°, the geometric shape and position parameters of the magnet slot 11 and the electromagnetic symmetry of the motor are coordinated with each other, which can make the magnetic field distribution more uniform, and further reduce the magnetic field distortion and harmonic loss, thereby improving the efficiency of the motor. It is also helpful to optimize the overall electromagnetic performance of the motor, that is, to reduce the torque ripple and reduce the harmonic content, and further improve the running stability and reliability of the motor.

[0051] Wherein, the angle α is greater than 14° and less than 19°. The specific values of the angle α include but are not limited to 16°, 17°, 18°, and 19°. In other embodiments, on the basis of guaranteeing the performance of the motor, It can be greater than 19° or less than 16°.

[0052] And the angle β of each magnetic pole on the rotor lamination 10 refers to the central angle occupied by each magnetic pole on the rotor circumference, which can determine the spatial distribution of the rotor magnetic field. Through the difference design with the angle α, The magnetic field distribution of the motor can be optimized, the harmonic loss can be reduced, and the motor performance can be improved.

[0053] When the angle β is greater than 14°, It is easy to cause the magnetic field distribution to be uneven, causing the local magnetic field strength to be too high, increasing the loss and reducing the motor efficiency, and also easy to cause the cogging torque to increase, causing the motor to produce relatively large vibration and noise during operation, affecting the running stability and mechanical life of the motor; when the angle β is less than 12°, It is easy to cause the magnetic field distribution to be too concentrated, causing the local magnetic field strength to be too high, increasing the loss and reducing the motor efficiency.

[0054] Therefore, the angle β is limited to be between 12° and 14°. This can avoid local stress concentration or electromagnetic force imbalance caused by extreme parameters, ensure that the magnetic field distribution is relatively uniform, be conducive to reducing the cogging torque, improving the running stability of the motor, reducing the noise and vibration of the motor during operation, and also be conducive to reducing the harmonic loss, thereby improving the efficiency of the motor.

[0055] Wherein, the angle β is greater than 12° and less than 14°. The specific values of the angle β include but are not limited to 12°, 13°, and 14°. In other embodiments, on the basis of guaranteeing the performance of the motor, It can be greater than 14° or less than 12°.

[0056] Optionally, in embodiments of the present invention, 110°≤γ≤120°, it is understood that the two inclined slot segments 113 are symmetrically arranged along the magnetic pole center of the rotor magnetic pole; in other embodiments, the magnet slot 11 can also be a straight slot symmetrically arranged about the magnetic pole center. When γ is greater than 120°, it is easy to cause uneven distribution of the magnetic field on the rotor surface, and the local magnetic field strength is reduced, especially the magnetic field strength on both sides of the magnet slot 11 will be significantly reduced, which will also lead to increased torque pulsation, affecting the efficiency and smoothness of motor operation. When γ is less than 110°, it is easy to cause the magnetic field to be too concentrated at the tip of the magnet slot 11, causing magnetic saturation and affecting motor efficiency; in order to achieve the same magnetic field strength, the magnetic field needs to be placed deeper to ensure that sufficient magnetic flux can pass through the rotor, but this will cause the magnetic flux to have to take a longer path to reach the rotor surface, thereby increasing magnetic resistance, resulting in increased magnetic flux loss and reduced magnetic field strength.

[0057] Therefore, limiting the included angle γ between 110° and 120° results in a more uniform magnetic field distribution on the rotor surface, which helps reduce torque pulsation, improve the smoothness of motor operation, reduce harmonic content, and lower noise and vibration during motor operation, thereby improving motor efficiency.

[0058] The specific values ​​of the included angle γ include, but are not limited to, 110°, 111°, 112°, 113°, 114°, 115°, 116°, 117°, 118°, 119°, and 120°.

[0059] Optionally, in embodiments of the present invention, 0.73 ≤ ≤0.79, where the ratio This reflects the proportional relationship between the distance between the magnet slot 11 and the rotor center and the outer radius of the rotor lamination 10, thereby limiting the position of the magnet slot 11 on the rotor lamination 10 and optimizing motor performance.

[0060] when When the magnetic flux density is greater than 0.79, the magnet slot 11 is far from the rotor center, making the magnetic field distribution prone to unevenness. This leads to increased torque pulsation, reduced motor efficiency, and affects the motor's electromagnetic performance. Furthermore, the structure is relatively loose, which can easily result in insufficient overall rigidity of the motor and reduce its operational stability. When the magnetic field strength is less than 0.73, the magnet slot 11 is too close to the rotor center, and the magnetic field is easily too concentrated, resulting in excessive local magnetic field strength, causing magnetic saturation, reducing motor efficiency. In addition, the structure is too compact, which makes it easy to deform or even be damaged due to stress concentration.

[0061] Therefore, By limiting the magnetic field strength and distribution to between 0.73 and 0.79, a better balance can be achieved, which ensures the efficiency and performance of the motor and helps to reduce torque ripple and improve the smoothness of motor operation.

[0062] in, The specific values ​​include, but are not limited to, 0.73, 0.74, 0.75, 0.76, 0.77, 0.78, and 0.79.

[0063] Optionally, in an embodiment of the present invention, 5≤GCD(Q,P)≤6, which can ensure a more uniform magnetic field distribution, reduce harmonic losses, thereby helping to improve motor efficiency, and can also effectively reduce cogging torque, making the motor run more smoothly and reducing vibration and noise.

[0064] Optionally, in embodiments of the present invention, 1.4 ≤ Q / 2P ≤ 1.6. It is understood that tooth harmonics are generated due to the interaction between stator and rotor teeth; therefore, when 1.4 ≤ Q / 2P, the harmonics are less likely to occur. When the ratio is ≤1.6, the interaction between the stator slots and rotor poles is more uniform, which can effectively reduce the generation of tooth harmonics, thereby reducing the vibration amplitude of the motor, lowering the noise generated during motor operation, and improving the motor efficiency. At the same time, this slot-pole matching ratio can make the air gap magnetic field of the motor more uniform. A uniform air gap magnetic field can reduce electromagnetic vibration and noise during motor operation, and also helps to improve the power factor of the motor.

[0065] Furthermore, a reasonable slot-pole ratio allows the motor to output torque more smoothly under different load conditions. This slot-pole ratio enables the motor to maintain stable operation better when facing external interfering magnetic fields. This is because the optimized distribution of the internal magnetic field of the motor makes the impact of external magnetic field interference on the internal magnetic field of the motor relatively small.

[0066] Optionally, in an embodiment of the present invention, Q=15 and P=5, at which point the angle β occupied by each magnetic pole on the rotor lamination 10 is 36°. Thus, by using a reasonable slot pole combination, the generation of tooth harmonics can be reduced. At the same time, this slot pole combination enables a stronger magnetic field to be generated in the air gap of the motor. Consequently, when current passes through the motor windings, the torque generated by the interaction between the magnetic field and the current is greater, thereby improving the output torque of the motor.

[0067] Furthermore, configuring the motor as a 15-slot, 10-pole motor, through a rational design—that is, using more slots to distribute the current—results in a more uniform magnetic field generated by the interaction of currents in each slot, thus reducing torque fluctuations under different loads and speeds. Finally, this combination of stator slots and rotor poles can, to some extent, make the motor more compact, thereby contributing to motor miniaturization.

[0068] Optionally, in the embodiments of the present application, two buckle holes 13 are arranged on the magnetic pole of the rotor lamination 10, and the two buckle holes 13 are arranged on opposite sides of the magnet slot 11 along the radial direction of the rotor lamination 10, wherein each rotor lamination 10 is stacked along the axial direction, and is fixed into a rotor core through the cooperation of the buckle holes 13 and the corresponding fastening structure, as shown in the figure. Figure 1 When each magnetic pole is provided with two buckle holes 13, and the two buckle holes 13 are arranged on opposite sides of the magnet slot 11 along the radial direction of the rotor lamination 10, that is, one buckle hole 13 is arranged on the inner side of the magnet slot 11, and the other buckle hole 13 is arranged on the outer side of the magnet slot 11, the overall connection strength and stability of the rotor core can be enhanced, and the magnet and the rotor core can be more closely combined together, thereby reducing the air gap between the magnet and the rotor core, the rotor laminations 10, and reducing the eddy current loss and magnetic flux leakage, thereby improving the motor efficiency. The inner side of the magnet slot 11 refers to the side of the magnet slot 11 facing the center of the rotor lamination 10, and the outer side of the magnet slot 11 refers to the side of the magnet slot 11 facing the outer edge of the rotor lamination 10. However, the design is not limited to this, and in other embodiments, only the buckle holes 13 are arranged on the inner side or the outer side of the magnet slot 11, and the number of buckle holes 13 can be set according to specific requirements, and can be one or more.

[0069] Optionally, in the embodiments of the present application, the rotor lamination 10 is provided with an axis hole 12 concentric with the rotation center of the rotor, and the diameter of the axis hole 12 is D, 19mm≤D≤22mm, so that by reasonably controlling the size of the axis hole 12, the structural design of the motor is optimized, and the operating efficiency and stability of the motor are improved, so that the displacement of the motor meets the design expectation while meeting the power requirement of the motor.

[0070] It can be understood that by limiting the diameter of the axis hole 12 to between 19mm and 22mm, the rotor and the shaft are well matched, which can effectively reduce energy loss, especially reduce vibration and additional friction loss during operation, thereby improving the efficiency and operating stability of the motor, and also helping the rotor lamination 10 and the stator magnetic field to better interact with each other, improving the electromagnetic performance of the motor, and improving the power of the motor.

[0071] Further, the good matching of the rotor and the shaft can ensure the performance and operating stability of the motor, and thus ensure the smooth operation of the piston of the compressor, thereby ensuring the stable displacement of the compressor.

[0072] The present application also proposes a compressor, which comprises a motor, and the specific structure of the motor refers to the above-mentioned embodiments. Since the compressor adopts all the technical solutions of the above-mentioned embodiments, it at least has all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be repeated here.

[0073] The application further provides a refrigeration device, which comprises a compressor, the specific structure of which is referred to the above-mentioned embodiments, and since the refrigeration device adopts all the technical solutions of the above-mentioned embodiments, it at least has all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be repeated here.

[0074] Specifically, the refrigeration device comprises a compressor and a liquid accumulator, a motor can provide power for the compressor to operate normally, and the high-temperature and high-pressure refrigerant gas discharged by the compressor is cooled into liquid state by the condenser and then flows into the liquid accumulator for storage, and the liquid accumulator can also filter impurities in the refrigerant to prevent the impurities from entering the evaporator.

[0075] The above-mentioned is only an exemplary embodiment of the application, and does not limit the protection scope of the application, and any equivalent structural transformation made by using the content of the specification and drawings of the application, or direct / indirect application in other related technical fields is included in the protection scope of the application.

Claims

1. An electric machine characterized in that, Comprising: a stator provided with a plurality of stator slots, the number of the stator slots being Q; a rotor provided inside the stator, the rotor comprising a plurality of rotor laminations stacked along an axial direction thereof, the rotor laminations being distributed with a plurality of magnet slots along a circumferential direction thereof; wherein the rotor lamination has a number of rotor poles of 2P, the rotor lamination has a maximum distance from an outer edge of the rotor lamination to a center of the rotor of Ro, the rotor lamination has a minimum distance from the outer edge of the rotor lamination to the center of the rotor of Ri, the magnet slot has a first end point closest to the outer edge of the rotor lamination and a second end point, the first end point and the second end point form an angle a with the center of the rotor, each magnetic pole on the rotor lamination has an angle b, 0.03mm≤ ≤0.1mm, 0.12≤ ≤0.

15.

2. The electric machine of claim 1, wherein, 0.5mm≤Ro-Ri≤1.5mm.

3. The electric machine of claim 1, wherein, 23°≤α≤26°。 4. The electric machine of claim 1, wherein, The minimum distance from the magnet slot to the rotor center is L. The magnet slot includes two inclined slot sections arranged at an angle. The two inclined slot sections are arranged close to each other in a direction away from the outer edge of the rotor lamination. The included angle between the two inclined slot sections is γ, 16°≤ ≤19°, 12°≤β- ≤14°.

5. The electric machine of claim 4, wherein, 110°≤γ≤120°.

6. The electric machine of claim 4, wherein, 0.73≤L / Ro≤0.

79.

7. The electric machine of claim 1, wherein, 5≤GCD(Q,P)≤6.

8. The electric machine of claim 1, wherein, 1.4≤Q / 2P≤1.

6.

9. The electric machine of claim 1, wherein, Q=15, and P=5.

10. The electric machine of claim 1, wherein, Two buckle holes are provided on a magnetic pole of the rotor lamination, the two buckle holes being provided on opposite sides of the magnet slot along a radial direction of the rotor lamination.

11. The electric machine of any one of claims 1 to 10, wherein, The rotor lamination is provided with an axle hole concentric with a rotation center of the rotor, a diameter of the axle hole being D, 19mm≤D≤22mm.

12. A compressor characterized by, Comprising the motor as claimed in any one of claims 1 to 11.

13. A refrigeration appliance characterized in that, Comprising the compressor as claimed in claim 12.

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