Electric machine, compressor and refrigeration plant

Abstract

This invention discloses a motor, compressor, and refrigeration equipment, relating to the technical field of refrigeration equipment. The rotor has 2P poles, the stator has Q slots, the longest distance between the bottom of the first magnetic adjustment slot and the center of the stator lamination is Ls, the minimum inner diameter of the stator lamination is Di, the angle between the line connecting point A and the center of the stator lamination and the centerline of the stator tooth length direction is α, and the two farthest endpoints of the tooth shoe portion along the circumferential direction of the stator lamination are points B and C, respectively. The angle between the line connecting point B and the center of the stator lamination and the line connecting point C and the center of the stator lamination is β, where 0° ≤ 1.27° and 0mm ≤ 0.2mm. The technical solution provided by this invention reduces motor torque ripple, reduces motor noise, and improves motor energy efficiency.

Description

Technical Field

[0001] This invention relates to the technical field of refrigeration equipment, and particularly to a motor, a compressor, and refrigeration equipment. Background Technology

[0002] Currently, with rapid economic development and improved living standards, miniaturization, high efficiency, and low noise are increasingly becoming the demands of consumers in the compressor field. In related technologies, the harmonics of the motor's air gap magnetic flux density lead to significant motor vibration, resulting in higher noise levels and consequently lower overall machine efficiency. Summary of the Invention

[0003] The main objective of this invention is to provide an electric motor, a compressor, and a refrigeration device, which aims to reduce motor torque pulsation, reduce motor noise, and improve motor energy efficiency.

[0004] To achieve the above objectives, the present invention provides a motor comprising:

[0005] A rotor, wherein the number of poles of the rotor is 2P; and

[0006] The stator comprises multiple stacked stator laminations, each lamination including a stator yoke, multiple stator teeth, and multiple tooth shoe portions. Each stator lamination has stator slots. Each tooth shoe portion has two first magnetic adjustment slots on its side opposite to the stator teeth. The two first magnetic adjustment slots are symmetrically arranged along the centerline of the corresponding stator tooth length direction. The number of stator slots is Q. The longest distance between the bottom of the first magnetic adjustment slot and the center of the stator lamination is Ls. The minimum inner diameter of the stator lamination is Di. The farthest point on the wall of the first magnetic adjustment slot from the centerline of the stator tooth length direction is point A. The angle between the line connecting point A and the center of the stator lamination and the centerline of the stator tooth length direction is α. The two farthest endpoints of the tooth shoe portion along the circumferential direction of the stator lamination are points B and C, respectively. The angle between the line connecting point B and the center of the stator lamination and the line connecting point C and the center of the stator lamination is β, where 0° ≤ ≤1.27°, 0mm≤ ≤0.2mm.

[0007] In one embodiment, the rotor includes a plurality of stacked rotor laminations. Each rotor lamination has multiple sets of second magnetic adjustment slots and multiple sets of magnetic cylinder slots. Each set of magnetic cylinder slots corresponds to one set of second magnetic adjustment slots. Two second magnetic adjustment slots are provided in each set. The two second magnetic adjustment slots in the same set are symmetrically arranged along the centerline of the corresponding set of magnetic cylinder slots. The shortest distance between the two second magnetic adjustment slots in the same set is Lr, and the straight-line distance between point B and point C is Lt, 0.2mm ≤ ≤0.9mm.

[0008] In one embodiment, 6mm≤Lt≤16mm, 2.5mm≤Lr≤3mm.

[0009] In one embodiment, 0mm≤ i≤1mm.

[0010] In one embodiment, 1.5°≤α≤12°, 10°≤β≤24°.

[0011] In one embodiment, 5≤ ≤6.

[0012] In one implementation, , 5≤P≤6, 12≤Q≤18.

[0013] In one implementation, Q=15 and P=5.

[0014] In one embodiment, the minimum inner diameter of the rotor is Dx, 19 .

[0015] The present invention also proposes a compressor comprising the motor described above.

[0016] In one embodiment, the compressor further includes cylinders that are connected to the motor via a drive, and the number of cylinders is y, where 2≤y≤3.

[0017] The present invention also proposes a refrigeration device, including the compressor described above.

[0018] In the technical solution of this invention, α, β, Q, P, Ls, and Di are limited to 0°≤ ≤1.27°, 0mm≤ Within the range of ≤0.2mm, this reduces motor noise, torque ripple, harmonic content of the magnetic field, and iron loss, thereby improving motor efficiency. Among these, This indicates the deviation angle of the first adjusting slot relative to the center line of the stator tooth length direction. Therefore, if If the angle is greater than 1.27°, it indicates that α is too small relative to β. This means that the farthest point A of the first adjusting slot is too close to the center line of the stator tooth length direction, which in turn indicates that the slot width of the first adjusting slot is too small. Consequently, the first adjusting slot is too small, which means that its effect of reducing cogging torque and torque ripple is worse, increasing torque ripple. Therefore, by using 0°≤ Within the range of ≤1.27°, the first magnetic slot optimizes the air gap permeability of the motor, weakens cogging torque and torque ripple, reduces motor torque ripple, and improves motor efficiency. Represents the greatest common divisor of Q and 2P. This indicates a limitation on the depth of the first magnetizing slot in motors with different slot poles. If Ls > 0.2mm, it indicates that Ls is too large relative to 0.5Di, meaning the depth of the first tuning slot is too large. An excessively deep first tuning slot significantly increases the effective air gap length, weakens the main magnetic flux, and may cause more drastic changes in magnetic flux density near the slot opening and bottom, leading to increased iron losses in the motor. Simultaneously, an excessively deep first tuning slot may excessively modulate the air gap permeability. While this might suppress the target order force wave, it could excite or enhance other non-target order harmonics, resulting in torque pulsation excitation noise. Therefore, by ensuring 0mm ≤ Within the range of ≤0.2mm, the air gap magnetic permeability of the motor is optimized, the motor noise is reduced, the iron loss of the motor is reduced, and the energy efficiency of the motor is improved. Attached Figure Description

[0019] 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.

[0020] Figure 1 This is a schematic diagram of the stator structure in the electric motor provided by the present invention;

[0021] Figure 2 This is a schematic diagram of the rotor structure in the electric motor provided by the present invention;

[0022] Figure 3 Different for the present invention Low-frequency load torque pulsation trend chart;

[0023] Figure 4 Different for the present invention Torque pulsation excitation noise trend chart;

[0024] Figure 5 Different for the present invention The back electromotive force (THD) trend chart.

[0025] Explanation of icon numbers:

[0026] 10. Stator; 11. Stator yoke; 12. Stator tooth; 13. Tooth shoe; 131. First magnetic adjustment slot; 14. Stator slot; 20. Rotor; 21. Cylinder slot; 22. Second magnetic adjustment slot.

[0027] 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

[0028] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0029] It should be noted that if the embodiments of the present invention involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0030] Furthermore, if the embodiments of this invention involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0031] Reference Figure 1 and Figure 2 The present invention proposes an electric motor, comprising:

[0032] Rotor 20, wherein the number of poles of rotor 20 is 2P; and

[0033] Stator 10, comprising a plurality of stacked stator laminations, each stator lamination including a stator yoke 11, a plurality of stator teeth 12, and a plurality of tooth shoe portions 13. Each stator lamination has stator slots 14. Each tooth shoe portion 13 has two first magnetic adjustment slots 131 on the side opposite to the stator teeth 12. The two first magnetic adjustment slots 131 are symmetrically arranged along the centerline of the corresponding stator teeth 12. The number of stator slots 14 is Q. The bottom of the first magnetic adjustment slot 131 is closest to the center of the stator lamination. The long distance is Ls, the minimum inner diameter of the stator lamination is Di, the farthest point on the wall of the first magnetic adjustment groove 131 from the center line of the stator tooth 12 in the length direction is point A, the angle between the line connecting point A and the center of the stator lamination and the center line of the stator tooth 12 in the length direction is α, the two farthest endpoints of the tooth shoe portion 13 along the circumferential direction of the stator lamination are points B and C, respectively, the angle between the line connecting point B and the center of the stator lamination and the line connecting point C and the center of the stator lamination is β, 0°≤ ≤1.27°, 0mm≤ ≤0.2mm.

[0034] In the technical solution of this invention, α, β, Q, P, Ls, and Di are limited to 0°≤ ≤1.27°, 0mm≤ Within the range of ≤0.2mm, this reduces motor noise, torque ripple, harmonic content of the magnetic field, and iron loss, thereby improving motor efficiency. Among these, This indicates the deviation angle of the first adjusting slot 131 relative to the center line of the stator tooth 12 along its length direction, as referenced. Figure 3 Therefore, if If the angle is greater than 1.27°, it indicates that α is too small relative to β. This means that the farthest point A of the first adjusting slot 131 is too close to the center line of the stator tooth 12 along its length. Consequently, the slot width of the first adjusting slot 131 is too small, meaning the slot itself is too small. This further reduces the effectiveness of the first adjusting slot 131 in reducing cogging torque and torque ripple, increasing torque ripple. Therefore, by using 0°≤ Within the range of ≤1.27°, the first magnetic adjustment slot 131 optimizes the air gap permeability of the motor, weakens cogging torque and torque ripple, reduces the motor's torque ripple, and improves the motor's energy efficiency. Represents the greatest common divisor of Q and 2P. This indicates the limitation on the depth of the first magnetizing slot 131 in different slot pole motors, refer to... Figure 4 ,like If Ls > 0.2mm, it indicates that Ls is too large relative to 0.5Di, meaning the depth of the first tuning slot 131 is too large. An excessively deep first tuning slot 131 significantly increases the effective air gap length, weakens the main magnetic flux, and may cause more drastic changes in magnetic flux density near the slot opening and bottom, leading to increased iron losses in the motor. Simultaneously, an excessively deep first tuning slot 131 may excessively modulate the air gap permeability. While this might suppress the target order force wave, it could potentially excite or enhance other non-target order harmonics, resulting in torque pulsation excitation noise. Therefore, by ensuring 0mm ≤ Within the range of ≤0.2mm, the air gap permeability of the motor is optimized, reducing motor noise, reducing iron loss, and improving motor energy efficiency. Here, α and β are in degrees (°), and Ls and Di are in millimeters (mm).

[0035] The measurement method for α is as follows: A centerline is drawn along the length of the stator tooth 12. One or more regions of the first magnetic adjustment slot 131 furthest from the centerline are selected. Multiple points are then selected within these regions, and the distance N between each point and the centerline is measured. The point with the largest N value is designated as point A. A line is drawn connecting point A and the center of the stator lamination. Finally, the angle between this line and the centerline is measured using an angle measuring device; this angle is α. It should be noted that the selected points may differ each time, resulting in different N values. However, all these points are designated as point A. As long as the points in the furthest region of the first magnetic adjustment slot 131 are selected, the error remains within a reasonable range and does not affect the final result of this application.

[0036] The method for measuring β is as follows: draw a line connecting point B to the center of the stator lamination and a line connecting point C to the center of the stator lamination. Then, measure the included angle between the two lines using an angle measuring device. This is β.

[0037] The method for measuring Ls is as follows: Select one or more areas of the deepest part of the first magnetic adjustment groove 131, then select multiple points in each of these areas, and measure the distance N between each of these points and the center of the stator lamination. The value of N with the smallest value is Ls. It should be noted that the selected points may differ each time, resulting in different Ls values. However, all these values ​​are Ls. As long as the points in the deepest part of the first magnetic adjustment groove 131 are selected, the error will be within a reasonable range and will not affect the calculation formula of this application. The deepest part can be obtained through approximate measurement or visual inspection.

[0038] The method for measuring Di is as follows: Draw a straight line passing through the center of the rotor 20 lamination. The two intersection points of this straight line with the side wall of the toothed shoe 13 away from the stator tooth 12 are E and F. The straight line and its extension cannot pass through the first magnetic adjustment slot 131 or other slot structures of the toothed shoe 13 away from the stator tooth 12. The distance between points E and F is Di.

[0039] Furthermore, the rotor 20 includes a plurality of stacked rotor laminations. Each rotor lamination has multiple sets of second magnetic adjustment slots 22 and multiple sets of magnetic cylinder slots 21. Each set of magnetic cylinder slots 21 corresponds to a set of second magnetic adjustment slots 22. Each set of second magnetic adjustment slots 22 has two corresponding slots. The two second magnetic adjustment slots 22 in the same set are symmetrically arranged along the centerline of the corresponding set of magnetic cylinder slots 21. The shortest distance between the two second magnetic adjustment slots 22 in the same set is Lr, and the straight-line distance between point B and point C is Lt, 0.2mm ≤ ≤0.9mm.

[0040] Reference Figure 5 ,in, On average, the width of the stator tooth 12 shoe corresponding to each stator slot 14 exceeds the width of the critical magnetic bridge of the rotor 20 poles by an amount that, if A value >0.9mm indicates that Lt is too large relative to Lr, which can lead to two scenarios. One is that an excessively large Lt, with its wide stator tooth 12, may result in excessively high magnetic flux density, either on its own or near the tooth root, causing localized core saturation, increasing iron losses, reducing efficiency, causing heat generation, and resulting in excessive back electromotive force (EMF) of the motor. The other scenario is that an excessively small Lr indicates that the magnetic bridge of the rotor 20 is too narrow. An excessively wide stator tooth 12 attempting to force a large amount of magnetic flux through this narrow bottleneck will severely exacerbate the saturation of the rotor 20 magnetic bridge. This not only significantly increases iron losses and heat generation but also significantly weakens the main magnetic flux, reducing torque output and power density. Severe saturation can also distort the air gap magnetic field, further leading to excessive back EMF of the motor. Furthermore, if Lr is too small, the magnetic bridge between two adjacent second adjusting slots 22 will be too small, reducing the structural strength of the rotor 20 laminations and increasing the risk of breakage during high-speed operation.

[0041] like If the distance is less than 0.2mm, it indicates that Lt and Lr are very close, meaning Lt is too small or Lr is too large. An excessively narrow stator tooth 12 shoe makes it impossible to effectively collect or guide the air gap flux, resulting in some flux failing to participate in energy conversion. This is equivalent to increasing the effective magnetic reluctance of the magnetic circuit, which reduces the motor's torque density, power factor, and efficiency. The rotor 20 adjusting slots rely on forming controllable magnetic circuit bottlenecks on the pole surfaces to modulate the magnetic permeability. If the magnetic bridge is too wide (i.e., Lr is too large), its ability to attenuate specific harmonics will be greatly weakened because the magnetic circuit bottleneck is not obvious and cannot effectively change the magnetic permeability distribution, thus also leading to an excessively large back electromotive force in the motor. Therefore, by using a distance of 0.2mm ≤ ≤0.9mm, thereby modulating the air gap permeability, weakening specific cogging torque, torque pulsation, and electromagnetic force waves, helping to obtain a smoother sine wave or a desired specific waveform, reducing harmonic content, and thus reducing the motor's back electromotive force. The units for Lt and Lr are millimeters (mm).

[0042] The method for measuring Lt is as follows: Select the region with the shortest distance between two second magnetic adjustment slots 22 in the same group. Then, find multiple points within this region of each of the two second magnetic adjustment slots 22, and measure the distance between each pair of points. The distance with the smallest distance is Lt. It should be noted that the points selected may differ each time, resulting in different Lt values ​​each time. However, all these values ​​are Lt. As long as the points within the region with the shortest distance between the second magnetic adjustment slots 22 are selected, the error is within a reasonable range and does not affect the formula calculation of this application. The shortest region can be obtained through approximate measurement or visual inspection.

[0043] The method for measuring Lr is: directly measure the distance between points B and C using a straight-line measuring tool, which is Lr.

[0044] Specifically, 6mm≤Lt≤16mm, 2.5mm≤Lr≤3mm. This optimizes the harmonic regulation capabilities of the stator 10 and rotor 20, reduces motor torque pulsation, lowers motor noise, and improves motor energy efficiency.

[0045] Furthermore, 0mm≤ i≤1mm. Where, i represents the limitation on the depth of the first magnetic adjustment slot 131, if If i > 1mm, it means that Ls is too large relative to Di, that is, the depth of the first magnetic adjustment slot 131 is too large. An excessively deep first magnetic adjustment slot 131 will significantly increase the effective air gap length, weaken the main magnetic flux, and the magnetic flux density change near the slot opening and bottom of the slot may be more drastic, thereby increasing the iron loss of the motor, increasing the torque pulsation of the motor, increasing the noise of the motor, and thus reducing the energy efficiency of the motor. When i=0mm, it can be understood that the side of the toothed shoe portion 13 facing away from the stator tooth 12 does not have the first magnetic adjustment groove 131; alternatively, it can be understood that the entire sidewall of the toothed shoe portion 13 facing away from the stator tooth 12 is the first magnetic adjustment groove 131. Therefore, by 0mm≤ Setting i≤1mm within a reasonable range optimizes the air gap permeability of the motor, reduces torque pulsation, noise, and iron loss, and improves energy efficiency.

[0046] Specifically, 1.5°≤α≤12°, 10°≤β≤24°. The 1.5°≤α≤12° setting enhances the modulation capability of the tuning slot on the spatial harmonics of the air gap magnetic permeability, allowing it to more effectively "cut" or "twist" the magnetic lines of force passing through the toothed shoe portion 13, generating harmonics of the specific order required by the design. This cancels or weakens the main torque pulsations and cogging torque harmonic components caused by the slots in the stator 10 and the magnetic poles of the rotor 20. Simultaneously, it prevents the first tuning slot 131 from extending excessively to both sides of the toothed shoe portion 13 in the width direction, thereby increasing the mechanical strength of the toothed shoe portion 13 and reducing the risk of deformation or breakage under electromagnetic force. The 10°≤β≤24° setting ensures that the toothed shoe portion 13 has sufficient cross-sectional area to carry the main magnetic flux transmitted from the stator teeth 12, preventing the toothed shoe itself from becoming a bottleneck in the magnetic circuit and preventing premature saturation. It also helps support a smoother air gap magnetic flux distribution.

[0047] In one embodiment, 5≤ ≤6. This reduces cogging torque, making the motor run more smoothly and reducing vibration and noise. Simultaneously, the closer the back EMF waveform is to a sine wave, the better the motor's control performance and the smaller the torque ripple, thus reducing torque ripple. Furthermore, the reduction of spatial harmonics, especially low-order harmonics, directly contributes to the sinusoidalization of the back EMF waveform. Finally, spatial harmonics generate additional iron losses in the core; by reducing low-order harmonics, these additional losses can be effectively suppressed, thereby reducing the motor's iron losses and improving its efficiency.

[0048] Specifically, 5≤P≤6, 12≤Q≤18. Tooth harmonics are generated by the interaction between the stator yoke 11 and the rotor 20; therefore, when When 5≤P≤6 and 12≤Q≤18, the interaction between stator slot 14 and rotor 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 interference 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.

[0049] Specifically, Q=15 and P=5. By rationally selecting the slot-pole configuration, the generation of tooth harmonics can be reduced; simultaneously, this slot-pole configuration allows a stronger magnetic field to be generated in the motor's air gap. When current flows through the motor windings, the torque generated by the interaction of the magnetic field and the current is greater, thereby increasing the motor's output torque. Furthermore, through reasonable design, the 15-slot, 10-pole motor reduces torque fluctuations under different loads and speeds because there are more slots to distribute the current, and the magnetic field generated by the interaction of the currents in each slot is more uniform. Finally, this configuration of 14 stator slots and 20 rotor poles can, to some extent, make the motor more compact, thus contributing to motor miniaturization.

[0050] Specifically, the minimum inner diameter of the rotor 20 is Dx, 19. 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. The 20-lapped rotor with an inner diameter ranging from 19mm to 22mm provides sufficient space for internal heat dissipation channels without compromising the complexity of the heat dissipation path due to excessive size. The 20-lapped rotor with an inner diameter ranging from 19mm to 22mm also reduces electromagnetic and mechanical vibrations during motor operation, thus lowering noise and improving energy efficiency. Simultaneously, the motor can achieve higher power output within a limited space, further enhancing its energy efficiency.

[0051] The method for measuring Dx is as follows: Draw a straight line passing through the center of the rotor lamination 20. The two intersection points of this straight line with the inner peripheral wall of the rotor lamination 20 are E and F. The straight line and its extension cannot pass through the slot structure of the inner peripheral wall of the rotor lamination 20. Then the distance between points E and F is Dx.

[0052] The present invention also proposes a compressor, which includes a motor. The specific structure of the motor is as described in the above embodiments. Since the compressor of the present invention adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments.

[0053] Furthermore, the compressor also includes cylinders, which are drivenly connected to the motor. The number of cylinders is y, where 2 ≤ y ≤ 3. The motor in this invention is applied to a two- or three-cylinder compressor. Through ingenious phase design, it utilizes the inherent dynamic balance characteristics of a multi-cylinder system to fundamentally suppress vibration sources; it smooths torque input through load superposition, protecting and releasing the motor's high-efficiency, low-noise potential; it enhances the continuity of gas flow and system efficiency through the superposition of intake and exhaust processes; and it achieves compact and efficient electromechanical integration in terms of space utilization.

[0054] The present invention also proposes a refrigeration device, which includes a compressor. The specific structure of the compressor is as described in the above embodiments. Since the refrigeration device of the present invention adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here.

[0055] The above description is merely an exemplary embodiment of the present invention and does not limit the scope of protection of the present invention. Any equivalent structural transformations made based on the technical concept of the present invention and the contents of the specification and drawings of the present invention, or direct / indirect applications in other related technical fields, are included within the scope of protection of the present invention.

Claims

1. An electric motor, characterized in that, include: The rotor has 2P poles; and The stator comprises multiple stacked stator laminations, each lamination including a stator yoke, multiple stator teeth, and multiple tooth shoe portions. Each stator lamination has stator slots. Each tooth shoe portion has two first magnetic adjustment slots on its side opposite to the stator teeth. The two first magnetic adjustment slots are symmetrically arranged along the centerline of the corresponding stator tooth length direction. The number of stator slots is Q. The longest distance between the bottom of the first magnetic adjustment slot and the center of the stator lamination is Ls. The minimum inner diameter of the stator lamination is Di. The farthest point on the wall of the first magnetic adjustment slot from the centerline of the stator tooth length direction is point A. The angle between the line connecting point A and the center of the stator lamination and the centerline of the stator tooth length direction is α. The two farthest endpoints of the tooth shoe portion along the circumferential direction of the stator lamination are points B and C, respectively. The angle between the line connecting point B and the center of the stator lamination and the line connecting point C and the center of the stator lamination is β, where 0° ≤ ≤1.27°, 0mm≤ ≤0.2mm.

2. The motor as described in claim 1, characterized in that, The rotor comprises multiple stacked rotor laminations, each lamination having multiple sets of second magnetic adjustment slots and multiple sets of magnetic cylinder slots. Each set of magnetic cylinder slots corresponds to one set of second magnetic adjustment slots, and each set of second magnetic adjustment slots has two slots. The two second magnetic adjustment slots in the same set are symmetrically arranged along the centerline of the corresponding set of magnetic cylinder slots. The shortest distance between the two second magnetic adjustment slots in the same set is Lr, and the straight-line distance between point B and point C is Lt, 0.2mm ≤ ≤0.9mm.

3. The motor as described in claim 2, characterized in that, 6mm≤Lt≤16mm, 2.5mm≤Lr≤3mm.

4. The motor as described in claim 1, characterized in that, 0mm≤ i≤1mm。 5. The motor as described in claim 1, characterized in that, 1.5°≤α≤12°，10°≤β≤24°。 6. The motor as described in claim 1, characterized in that, 5≤ ≤6。 7. The motor as described in claim 1, characterized in that, ,5≤P≤6,12≤Q≤18。 8. The motor as described in claim 1, characterized in that, Q=15, P=5.

9. The motor as described in claim 1, characterized in that, The minimum inner diameter of the rotor is Dx, 19 .

10. A compressor, characterized in that, Includes the motor as described in any one of claims 1 to 9.

11. The compressor as claimed in claim 10, characterized in that, The compressor also includes cylinders, which are connected to the motor via a drive. The number of cylinders is y, where 2 ≤ y ≤ 3.

12. A refrigeration device, characterized in that, Including the compressor as described in claim 10 or 11.

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