Electric machine, compressor and refrigeration plant

Abstract

The application discloses a motor, a compressor and a refrigeration device, relates to the technical field of the refrigeration device, and the two end points on the same magnetic adjustment groove bottom wall are respectively C point and D point, the shortest circular arc arc length between the C point and the D point and with the center of the rotor punching sheet as the center is Sr, the pole number of the rotor is 2P, the included angle between the first groove wall and the center line of the corresponding group of magnetic steel grooves is alpha, the average angle number occupied by each pole of the rotor is beta, the two end points of the toothed shoe part towards the side wall of the air gap are respectively A point and B point, the shortest circular arc arc length between the A point and the B point and with the center of the stator as the center is St, 1.28mm<=St<=1.56mm, 0.4<=alpha<=0.6, 0.4<=beta<=0.6; the technical scheme provided by the application reduces the torque ripple of the motor, reduces the noise of the motor, and improves the motor efficiency.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of refrigeration equipment, in particular to a motor, a compressor and a refrigeration equipment. 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 compressor. The air gap magnetic flux harmonic of the motor in the related art causes large vibration of the motor, thereby causing large noise and low motor efficiency. SUMMARY

[0003] The main purpose of the present application is to provide a motor, a compressor and a refrigeration equipment, which aims to reduce the torque ripple of the motor, reduce the noise of the motor and improve the efficiency of the motor.

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

[0005] a stator, the stator comprising a stator yoke, a stator tooth and a tooth shoe part, the stator lamination being provided with a stator slot, the number of slots of the stator slot being Q; and

[0006] a rotor, the rotor and the stator forming an air gap therebetween, the rotor comprising a plurality of stacked rotor laminations, the rotor lamination being provided with a plurality of groups of magnetic steel slots, the outer peripheral wall of the rotor lamination being provided with a plurality of magnetic adjustment slots, one group of the magnetic steel slots corresponding to at least one of the magnetic adjustment slots, the two end points on the bottom wall of the same magnetic adjustment slot being C point and D point respectively, the shortest circular arc arc length between the C point and the D point and with the center of the rotor lamination as the center being Sr, the number of poles of the rotor being 2P, the slot wall of the magnetic adjustment slot close to one side of the center line of the corresponding group of the magnetic steel slots being a first slot wall, the extension line of the first slot wall passing through the center of the rotor, the included angle between the first slot wall and the center line of the corresponding group of the magnetic steel slots being a, the average angle number occupied by each pole of the rotor being b, the two end points of the side wall of the tooth shoe part on the side of the air gap being A point and B point respectively, the shortest circular arc arc length between the A point and the B point and with the center of the stator as the center being St, 1.28mm ≤1.56mm, 0.4° .

[0007] In an embodiment, the shortest distance between the magnetic adjustment slot and the center of the rotor is L, the maximum outer diameter of the rotor lamination is Dr, 0.06mm ≤0.11mm.

[0008] In an embodiment, .

[0009] In an embodiment, the minimum inner diameter of the rotor lamination is Dx, and 19mm≤Dx≤22mm.

[0010] In an embodiment, the maximum outer diameter of the rotor lamination is Dr, and 2.2mm≤Dr≤2.4mm.

[0011] In an embodiment, 1.4≤ ≤1.6.

[0012] In an embodiment, Q=15, and P=5.

[0013] In an embodiment, the magnet adjusting slot is located on one side of the center line of the corresponding group of magnet slots in the clockwise direction; and / or

[0014] the magnet adjusting slot is located on one side of the center line of the corresponding group of magnet slots in the counterclockwise direction.

[0015] The application also provides a compressor comprising the motor described above.

[0016] The application also provides a refrigeration device comprising the compressor described above.

[0017] In the technical solution of the application, St, Sr, a and β are limited in the range of 1.28mm≤ ≤1.56mm, 0.4°≤ , thereby reducing the torque ripple of the motor, reducing the noise of the motor, reducing the harmonic content of the magnetic field, reducing the iron loss, and improving the energy efficiency of the motor. In the technical solution of the application, represents the greatest common divisor of Q and 2P, represents the difference between the arc length of the toothed shoe part towards the rotor side and the arc length of the rotor magnet adjusting slot bottom, and therefore represents the difference between the arc length of the toothed shoe part towards the rotor side and the arc length of the rotor magnet adjusting slot bottom in different specifications of the motor, and therefore, if >1.56mm, it indicates that St is much larger than Sr, thereby causing the air gap magnetic flux waveform to be severely distorted at the toothed shoe, causing local magnetic saturation of the motor, increasing the iron loss, and further increasing the torque ripple of the motor and the noise; and if <1.28mm, it indicates that St and Sr are relatively close, thereby making the magnet adjusting slot unable to fully adjust the magnetic field, i.e., unable to adjust the harmonic content of the magnetic field in the motor. Therefore, by limiting 1.28mm≤ ≤1.56mm, the torque ripple of the motor is reduced, the noise of the motor is reduced, the harmonic content of the magnetic field is reduced, the iron loss is reduced, and the energy efficiency of the motor is improved. represents the deviation angle of the magnet adjusting slot relative to the center line of each pole of the rotor in different specifications of the motor, and if ​If the angle is greater than 0.7°, it indicates that the magnetizing slot α is too small. This will cause the magnetizing slot to deviate too much from the center line of the magnet slot, thus weakening the magnetic flux modulation effect of the magnetizing slot, increasing torque pulsation, and consequently increasing motor noise. It will also easily lead to localized oversaturation of the magnetic field. If the deviation is less than 0.4°, it indicates that the magnetizing slot is too close to the centerline of the corresponding magnet slot. This increases the machining precision of the magnetizing slot, raising the manufacturing cost of the motor. It also reduces the magnetic flux density of the motor, decreasing the output torque and consequently reducing the motor's energy efficiency. Therefore, by ensuring that 0.4° ≤ This reduces the machining precision of the magnetic groove while improving the magnetic field adjustment effect of the magnetic groove and thus improving the energy efficiency of the motor. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0019] Figure 1 A schematic diagram of the structure of an embodiment of the motor provided by the present invention;

[0020] Figure 2 for Figure 1 A magnified view of a section at point Z;

[0021] Figure 3 for Figure 1 Schematic diagram of the middle rotor;

[0022] Figure 4 for Figure 1 A comparison diagram of torque pulsation of the motor in different implementations and existing technical solutions.

[0023] Explanation of icon numbers:

[0024] 10. Stator; 11. Stator yoke; 12. Stator tooth; 13. Tooth shoe; 14. Stator slot; 20. Rotor; 21. Magnet slot; 22. Magnetizing slot; 221. First slot wall; 30. Air gap.

[0025] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0026] 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 a part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments of the present application, all the other embodiments obtained by a person of ordinary skill in the art without creative work fall within the scope 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 positional relationship, movement condition, etc. between components in a certain posture, and if the certain posture changes, the directional indications 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 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” 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 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 realization of a person of ordinary skill in the art, 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] With reference to Figures 1 to 3 , the present application proposes an electric machine, comprising:

[0030] a stator 10, the stator 10 comprising a stator yoke 11, a stator tooth 12 and a tooth shoe part 13, the stator 10 being provided with a stator slot 14 in the stator lamination, the number of slots of the stator slot 14 being Q; and

[0031] A rotor 20 is formed with an air gap 30 with the stator 10, the rotor 20 comprises a plurality of stacked rotor laminations, a plurality of groups of magnetic steel grooves 21 are arranged in the rotor laminations, a plurality of magnetic adjustment grooves 22 are arranged at intervals on the outer circumferential wall of the rotor laminations, one group of the magnetic steel grooves 21 corresponds to at least one of the magnetic adjustment grooves 22, two end points on the bottom wall of the same magnetic adjustment groove 22 are respectively C point and D point, the shortest circular arc length between the C point and the D point and with the center of the rotor lamination as the center is Sr, the pole number of the rotor 20 is 2P, the groove wall of the magnetic adjustment groove 22 close to the center line of the corresponding group of the magnetic steel grooves 21 is a first groove wall 221, the extension line of the first groove wall 221 passes through the center of the rotor 20, the included angle between the first groove wall 221 and the center line of the corresponding group of the magnetic steel grooves 21 is α, the average angle occupied by each pole of the rotor 20 is β, the two end points of the side wall of the toothed shoe part 13 towards the air gap 30 side are respectively A point and B point, the shortest circular arc length between the A point and the B point and with the center of the stator 10 as the center is St, 1.28mm≤ ≤1.56mm, 0.4°≤ .

[0032] In the technical scheme of the present application, St, Sr, α and β are limited in the range of 1.28mm≤ ≤1.56mm, 0.4°≤ , thereby reducing the noise of the motor, reducing the torque ripple of the motor, reducing the harmonic content of the magnetic field, reducing the iron loss, and thereby improving the energy efficiency of the motor. Among them, represents the greatest common divisor of Q and 2P, represents the difference between the arc length of the toothed shoe part 13 towards the rotor 20 side and the bottom arc length of the rotor 20 magnetic adjustment groove 22, therefore represents the difference between the arc length of the toothed shoe part 13 towards the rotor 20 side and the bottom arc length of the rotor 20 magnetic adjustment groove 22 under different specifications of the motor, therefore, if >1.56mm, it means that St is much larger than Sr, thereby causing the air gap magnetic flux density waveform to be severely distorted at the toothed shoe, causing local magnetic saturation of the motor, increasing the iron loss, and thereby increasing the torque ripple of the motor and significantly increasing the noise; and if <1.28mm, it means that St and Sr are relatively close, thereby making it impossible for the magnetic adjustment groove 22 to fully adjust the magnetic field, that is, it is impossible to adjust the harmonic content of the magnetic field in the motor. Therefore, by limiting 1.28mm≤ ≤1.56mm, the torque ripple of the motor is reduced, the noise of the motor is reduced, the harmonic content of the magnetic field is reduced, the iron loss is reduced, and the energy efficiency of the motor is improved. represents the deviation angle of the magnetic adjustment groove 22 relative to the center line of each pole of the rotor 20 under different specifications of the motor, if If α > 0.7°, it means that the magnetic adjustment slot 22 is too small, which will cause the magnetic adjustment slot 22 to deviate from the center line of the magnetic steel slot 21 too much, thereby weakening the magnetic flux modulation effect of the magnetic adjustment slot 22, increasing the torque ripple, and further increasing the noise of the motor. At the same time, it is easy to cause local excessive saturation of the magnetic field. If α < 0.4°, it means that the magnetic adjustment slot 22 is too close to the center line of the corresponding magnetic steel slot 21, thereby increasing the processing precision of the magnetic adjustment slot 22, increasing the production cost of the motor, and on the other hand, reducing the magnetic density of the motor, reducing the output torque of the motor, and further reducing the energy efficiency of the motor. Therefore, by setting 0.4°≤ α ≤ 0.7°, the magnetic adjustment slot 22 is appropriately arranged, thereby improving the magnetic field adjustment effect of the magnetic adjustment slot 22, and improving the energy efficiency of the motor. Wherein the units of St and Sr are millimeters mm; the units of α and β are degrees °. Therefore, while reducing the processing precision of the magnetic adjustment slot 22, the magnetic field adjustment effect of the magnetic adjustment slot 22 is improved, and the energy efficiency of the motor is improved. Wherein the units of St and Sr are millimeters mm; the units of α and β are degrees °.

[0033] Wherein the measurement method of St is: draw the connecting line of point A and the center of stator 10, draw the connecting line of point B and the center of stator 10, then measure the included angle M between the two connecting lines by an angle measuring instrument, then measure the straight line distance r between point A or point B and the center of stator 10, then St = r / tan(M / 2). .

[0034] The measurement method of Sr is: draw the connecting line of point C and the center of stator 10, draw the connecting line of point D and the center of stator 10, then measure the included angle M between the two connecting lines by an angle measuring instrument, then measure the straight line distance r between point C or point D and the center of stator 10, then Sr = r / tan(M / 2). .

[0035] At the same time, it needs to be emphasized that St is not the length of the wall surface on the side of the toothed shoe part 13 away from the stator tooth 12. Only when the wall surface on the side of the toothed shoe part 13 away from the stator tooth 12 has the same curvature as the curvature of the outer periphery of the stator 10, the two are equal. Similarly, Sr is not the length of the bottom of the magnetic adjustment slot 22. Only when the curvature of the bottom of the magnetic adjustment slot 22 is consistent with the curvature of the outer periphery of the rotor 20, the two are equal.

[0036] The measurement method of α is: first draw the bisector of each group of magnetic steel slots 21, which is the center line of each group of magnetic steel slots 21, then draw the extension line of the first slot wall 221 to the center of the rotor lamination, and then measure the angle between the center line and the extension line by an angle measuring device, which is α.

[0037] The measurement method of β is: first count the number of poles 2P on the rotor lamination directly, and then β = 360° / 2P.

[0038] Further, the shortest distance between the magnetic adjustment slot 22 and the center of the rotor 20 is L, the maximum outer diameter of the rotor lamination is Dr, and 0.06mm≤ L / Dr ≤ 0.15mm. ​≤0.11mm. represents the matching degree of the depth of the flux modulation slot 22 and the slot-pole matching of the stator-rotor 20; if > 0.11mm, it means that L is too small, i.e., the flux modulation slot 22 is too deep, so that the magnetic flux is short-circuited, the main magnetic flux is reduced, and thus the output torque of the motor is reduced; at the same time, it is easy to cause the local saturation of the magnetic field at the bottom of the flux modulation slot 22, thereby increasing the iron loss and temperature rise, and reducing the efficiency of the motor; finally, the excessive depth of the flux modulation slot 22 causes the failure of the force wave modulation, and the resonance risk is caused. And if < 0.06mm, it means that L is too close to Dr, i.e., the depth of the flux modulation slot 22 is too shallow, so that the flux modulation ability and the harmonic adjustment ability of the flux modulation slot 22 are insufficient, thereby increasing the torque ripple, and further increasing the noise of the motor. Therefore, by reasonably setting 0.06mm≤ ≤0.11mm, the cogging torque and the torque ripple of the motor are reduced, the vibration and noise of the motor are suppressed, the iron loss of the motor is reduced, and the efficiency and torque density of the motor are improved. The units of L and Dr are both millimeters mm.

[0039] The measurement method of L is: selecting one or more regions with the deepest depth of the flux modulation slot 22, then selecting multiple points in the one or more regions respectively, and then measuring the distances N of the multiple points to the center of the rotor lamination respectively, wherein the minimum value of N is L. At the same time, it should be noted that there may be different points selected each time, so the value of L measured each time is different, but these values are all L, as long as the points in the deepest region of the depth of the flux modulation slot 22 are selected, the error is within a reasonable range, and does not affect the formula calculation of the present application.

[0040] The measurement method of Dr is: draw a straight line passing through the center of the rotor lamination, and the two intersection points of the straight line and the outer wall of the rotor lamination are E and F, and the straight line and its extension cannot pass through the flux modulation slot or other slot structure of the outer wall of the rotor lamination, then the distance between E and F is Dr.

[0041] Specifically, , thereby reducing the cogging torque, making the motor run more smoothly, reducing the vibration and noise of the motor. At the same time, the back electromotive force waveform is closer to a sine wave at this time, the control performance of the motor is better, the torque ripple is smaller, thereby reducing the torque ripple; further, the reduction of the spatial harmonics, especially the low-order harmonics, directly helps to make the back electromotive force waveform more sinusoidal; finally, the spatial harmonics will generate additional iron loss in the core, by reducing the low-order harmonics, these additional losses can be effectively suppressed, thereby reducing the iron loss of the motor, and further improving the efficiency of the motor.

[0042] In one embodiment, the minimum inner diameter of the rotor lamination is Dx, where 19mm ≤ Dx ≤ 22mm. This optimizes the air gap length and magnetic field distribution of the motor. A smaller air gap length reduces magnetic reluctance, thereby improving motor efficiency. Rotor laminations with an inner diameter in the range of 19mm to 22mm provide sufficient space for internal heat dissipation channels without compromising the complexity of the heat dissipation path due to excessive size. Rotor laminations with an inner diameter in the range of 19mm to 22mm also reduce electromagnetic and mechanical vibrations during motor operation, thereby reducing noise and improving motor energy efficiency. Simultaneously, the motor can achieve higher power output within a limited space, further enhancing its energy efficiency.

[0043] The method for measuring Dx is as follows: Draw a straight line passing through the center of the rotor lamination. The two intersection points of this straight line with the inner circumferential wall of the rotor lamination are E and F. The straight line and its extension cannot pass through the slot structure of the inner circumferential wall of the rotor lamination. Then the distance between points E and F is Dx.

[0044] In one embodiment, the maximum outer diameter of the rotor lamination is Dr, 2.2 mm ≤ With a gap length ≤2.4mm, the air gap length and magnetic field distribution of the motor can be optimized, resulting in more uniform electromagnetic performance. Furthermore, a proper match between the air gap length and the rotor 20 dimensions reduces magnetic reluctance and improves motor efficiency. Secondly, it ensures sufficient mechanical strength of the rotor laminations during operation, enabling the rotor 20 to withstand centrifugal and electromagnetic forces under high speed and high load conditions, thereby improving the motor's stability and reliability. Finally, it reduces electromagnetic and mechanical vibrations generated during motor operation, thus lowering motor noise.

[0045] Specifically, 1.4≤ ≤1.6. Tooth harmonics are generated by the interaction between stator 10 and rotor 20; therefore, when 1.4≤ When the value is ≤1.6, the interaction between stator slot 14 and rotor pole 20 is more uniform, which can effectively reduce the generation of tooth harmonics, thereby reducing the vibration amplitude of the motor, lowering the noise generated by the motor, and improving the efficiency of the motor. Simultaneously, this slot-pole matching ratio makes 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. Furthermore, a reasonable slot-pole matching ratio allows the motor to output torque more smoothly under different load conditions. Moreover, this slot-pole matching ratio enables the motor to maintain stable operation better when facing external interfering magnetic fields; because of the optimized distribution of the internal magnetic field of the motor, the impact of external magnetic field interference on the internal magnetic field of the motor is relatively small.

[0046] Specifically, Q=15, P=5. By reasonably selecting the 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. When the current passes through the motor winding, the torque generated by the interaction of the magnetic field and the current is larger, thereby improving the output torque of the motor. Further, the 15-slot 10-pole motor is designed reasonably, so that the torque fluctuation of the motor under different loads and speeds is reduced, because there are more slots to distribute the current, and the magnetic field generated by the interaction of the current in each slot is more uniform. Finally, this combination of stator slots 14 and rotor 20 poles can make the size of the motor more compact to some extent, thereby facilitating the miniaturization of the motor.

[0047] With reference to Figure 4 The motor in the technical solution of the present application is mainly used in a rotor compressor, and the motor of the rotor compressor is generally a unidirectional counterclockwise rotating motor. All motors will generate a phase shift opposite to the rotation direction during the rotation operation. The motor in the prior art does not have a magnetic adjustment slot 22, and the embodiments one to three of the technical solution of the present application all have the magnetic adjustment slot 22. However, the magnetic adjustment slot 22 in the embodiment one is located on one side of the center line of the corresponding group of magnetic steel slots 21 in the counterclockwise direction, the magnetic adjustment slot 22 in the embodiment two is located on one side of the center line of the corresponding group of magnetic steel slots 21 in the clockwise direction, and the same group of magnetic steel slots 21 in the embodiment three has a magnetic adjustment slot 22 on one side of the center line of the corresponding group of magnetic steel slots 21 in the clockwise direction and on one side of the center line of the corresponding group of magnetic steel slots 21 in the counterclockwise direction. Among them, the prior art and the embodiments one to three of the present application are consistent in the motor speed, rotation time, rotation direction (all unidirectional counterclockwise rotation), and environmental temperature during the experiment, and the motors in the prior art and the embodiments one to three of the present application are all unidirectional counterclockwise rotating motors.

[0048] With reference to Figure 4 It can be seen that the torque ripple of the motor in the prior art is 11.4%, which is the highest. The torque ripple of the motor in the embodiment one is 4.8%, which is the lowest. The torque ripple of the motor in the embodiment two is 10.2%, which is smaller than 11.4% in the prior art, but the difference between them is small. The torque ripple of the motor in the embodiment three is 6.5%, which is between the torque ripples of the embodiments one and two.

[0049] It can be understood that, in the first embodiment, the magnetic adjustment slot 22 is located on the side of the center line of the corresponding group of magnetic steel slots 21 in the counterclockwise direction, which can offset to a more appropriate phase and is more conducive to reducing the torque ripple of the motor. In the second embodiment, the magnetic adjustment slot 22 is located on the side of the center line of the corresponding group of magnetic steel slots 21 in the clockwise direction, and at this time the magnetic adjustment slot 22 offsets to a smaller phase, so the influence on the torque ripple of the motor is relatively small. In the third embodiment, the center line of the same group of magnetic steel slots 21 is provided with a magnetic adjustment slot 22 in the clockwise direction and the counterclockwise direction. The symmetrical layout of the magnetic adjustment slots 22 on both sides of the center line of the magnetic steel slots 21 can effectively reduce the cogging torque, because the magnetic adjustment slots 22 on both sides can balance the magnetic resistance change and reduce the overall harmonic content. However, for single counterclockwise rotation, the symmetrical layout is not optimal, because the magnetic adjustment slots 22 on both sides will simultaneously affect the magnetic field in the clockwise and counterclockwise directions, but the rotation direction is fixed, so that the optimization effect in the counterclockwise direction is diluted, and therefore in the third embodiment, the adjustment of the torque ripple by the two magnetic adjustment slots 22 is between the first embodiment and the second embodiment.

[0050] Of course, it should be noted that when the compressor is a scroll compressor, the general rotation direction of the scroll compressor is clockwise, that is, when the motor is a single clockwise rotating motor, the torque ripple of the motor with the magnetic adjustment slot 22 located on the side of the center line of the corresponding group of magnetic steel slots 21 in the counterclockwise direction should be significantly greater than the torque ripple of the motor with the magnetic adjustment slot 22 located on the side of the center line of the corresponding group of magnetic steel slots 21 in the clockwise direction.

[0051] The application also provides a compressor, which comprises a motor, and the specific structure of the motor is as described in the above embodiments. Since the compressor of the application adopts all the technical solutions of the above embodiments, it at least has all the beneficial effects brought by the technical solutions of the above embodiments, which will not be repeated here.

[0052] The application also provides a refrigeration equipment, which comprises a compressor, and the specific structure of the compressor is as described in the above embodiments. Since the refrigeration equipment of the application adopts all the technical solutions of the above embodiments, it at least has all the beneficial effects brought by the technical solutions of the above embodiments, which will not be repeated here.

[0053] The above is only an exemplary embodiment of the application, and does not limit the protection scope of the application. Any equivalent structural transformation made by referring to the content of the specification and drawings, 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 comprising a stator yoke, stator teeth and a toothed shoe portion, the stator lamination of the stator comprising stator slots, the number of slots of the stator slots being Q; and The rotor and the stator form an air gap therebetween, the rotor comprises a plurality of laminated rotor laminations, a plurality of groups of magnetic steel grooves are arranged in the rotor laminations, a plurality of magnetic adjustment grooves are arranged at intervals on the outer circumferential wall of the rotor laminations, one group of the magnetic steel grooves corresponds to at least one magnetic adjustment groove, two end points on the bottom wall of the same magnetic adjustment groove are respectively point C and point D, the shortest circular arc length between the point C and the point D and with the center of the rotor lamination as the center is Sr, the pole number of the rotor is 2P, the slot wall of the magnetic adjustment groove close to the center line of the corresponding group of the magnetic steel grooves is a first slot wall, the extension line of the first slot wall passes through the center of the rotor, the included angle between the first slot wall and the center line of the corresponding group of the magnetic steel grooves is α, the average angle occupied by each pole of the rotor is β, the two end points of the side wall of the toothed shoe part towards the air gap side are respectively point A and point B, the shortest circular arc length between the point A and the point B and with the center of the stator as the center is St, 1.28mm≤ ≤1.56mm, 0.4°≤ .

2. The electric machine of claim 1, wherein, The shortest distance between the magnetic adjustment slot and the center of the rotor is L, the maximum outer diameter of the rotor lamination is Dr, and 0.06mm≤L / Dr≤0.11mm. ≤0.11mm.

3. The electric machine of claim 1, wherein, 。 4. The electric machine of claim 1, wherein, the minimum inner diameter of the rotor lamination is Dx, 19 mm ≤ Dx ≤ 22 mm.

5. The electric machine of claim 1, wherein, The maximum outer diameter of the rotor lamination is Dr, 2.2 mm ≤ Dr ≤ 2.4 mm. ≤2.4mm.

6. The electric machine of claim 1, wherein, 1.4≤ ≤1.6。 7. The electric machine of claim 1, wherein, Q = 15, P = 5.

8. The electric machine of claim 1, wherein, the magnet adjusting slot is located on one side of the center line of the corresponding group of magnet slots in a clockwise direction; and / or the magnet adjusting slot is located on one side of the center line of the corresponding group of magnet slots in a counterclockwise direction.

9. A compressor characterized by, An electric machine comprising any one of claims 1 to 8.

10. A refrigeration appliance characterized in that, A compressor comprising the electric machine of claim 9.

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