Electric machine, compressor and refrigeration plant

Abstract

The application discloses a motor, a compressor and a refrigeration device, relates to the technical field of permanent magnet motors, and the motor comprises a stator core and a rotor core; a rotor hole is formed in the inner periphery of the stator core, the number of stator slots is Q, the width of the stator slot in the circumferential direction is W, and the minimum radius of the rotor hole is R; the rotor core is installed in the rotor hole, and a harmonic hole is further arranged between the two adjacent magnetic steel slots; the central angle of the harmonic hole corresponding to the center of the rotor core is A1, the pole number of the motor is 2P, and the following formula is satisfied: 2P / A1=Q / W+1 / 2. The technical scheme provided by the application aims at inhibiting harmonics, reducing torque fluctuation, and further reducing the operation noise of the motor.

Description

Technical Field

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

[0002] During motor operation, the interaction between the stator armature reaction magnetic field and the magnetic field generated by the rotor permanent magnet inevitably excites spatial harmonic magnetic fields. These harmonics not only cause additional eddy current losses and iron losses in the magnetic circuit, but also cause distortion of the air gap magnetic flux density distribution, resulting in large torque fluctuations and severe vibration and noise in the motor. Summary of the Invention

[0003] The main objective of this invention is to provide a motor, compressor, and refrigeration equipment designed to suppress harmonics, reduce torque fluctuations, and thereby reduce motor operating noise.

[0004] To achieve the above objectives, the motor proposed in this invention includes:

[0005] A stator core, comprising a stator yoke and a plurality of stator teeth spaced apart along the inner circumference of the stator yoke, wherein two adjacent stator teeth and the stator yoke enclose a stator slot, and one end of the plurality of stator teeth away from the stator yoke encloses a rotor hole, wherein the number of stator slots is Q, each stator slot has a slot opening communicating with the rotor hole, the width of the slot opening in the circumferential direction of the stator core is W, and the minimum radius of the rotor hole is R; and

[0006] The rotor core is mounted in the rotor hole. The rotor core includes multiple circumferentially distributed magnetic slots. Between two adjacent magnetic slots, the rotor core also has harmonic holes. The central angle formed by the harmonic holes and the centers of the rotor core is A1. The motor has 2P poles, satisfying the following: .

[0007] In one embodiment, the magnetic slot includes a slot wall disposed towards the outer periphery of the rotor core, wherein the central angle formed by the slot wall and the center of the rotor core is A2, satisfying: .

[0008] In one embodiment, A1 and A2 also satisfy: .

[0009] In one embodiment, the minimum distance from the harmonic aperture to the outer periphery of the rotor core is d1, and the minimum distance from the magnet slot to the outer periphery of the rotor core is d2 at the end of the magnet slot adjacent to the harmonic aperture, satisfying: .

[0010] In one embodiment, the rotor core includes a first diameter passing through the center of the magnet slot in the circumferential direction and a second diameter passing through the center of the harmonic hole in the circumferential direction, the harmonic hole being symmetrically arranged around the second diameter and the magnet slot being symmetrically arranged around the first diameter.

[0011] In one implementation, Q also satisfies: 2P also satisfies: GCD(Q,P) is the greatest common divisor of Q and P, satisfying: .

[0012] In one embodiment, the number of slots per pole per phase of the motor is q, and Q, P, and the number of phases m of the motor satisfy: q = Q / 2mP, where, .

[0013] In one embodiment, the rotor core is further provided with a plurality of rivet holes spaced apart circumferentially, the rivet holes and the harmonic holes being spaced apart radially, the rivet holes being connected to adjacent harmonic holes, or the rivet holes being separated from adjacent harmonic holes.

[0014] The present invention also proposes a compressor, which includes a motor as described above.

[0015] The present invention also proposes a refrigeration device, which includes a compressor as described above.

[0016] The technical solution of this invention takes the sum of the central angles of all harmonic holes corresponding to the centers of the rotor core as the total arc of the rotor-side harmonic holes, and takes the sum of the central angles of all stator teeth corresponding to the centers of the rotor core as the total arc of the effective armature poles on the stator side. Then, it limits the range of the ratio between the total arc of the rotor-side harmonic holes and the total arc of the effective armature poles on the stator side, reflecting the degree of matching between them. When the ratio is in the range of 0.075 to 0.14, the harmonic holes can produce phase cancellation or magnetic circuit blocking effects on the main harmonics excited by the stator armature reaction magnetic field, effectively weakening harmful harmonic components and avoiding increased leakage flux or a sharp increase in main magnetic circuit reluctance due to excessively large harmonic holes. Therefore, this solution achieves harmonic synergistic optimization of the magnetic circuit structure without sacrificing motor output torque and efficiency, thereby reducing torque fluctuations, improving motor operating stability, and reducing motor operating noise. Attached Figure Description

[0017] 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.

[0018] Figure 1 A schematic diagram of the structure of an embodiment of the motor provided by the present invention;

[0019] Figure 2 for Figure 1 A magnified view of a section at point A in the middle;

[0020] Figure 3 for Figure 1 A graph showing the changes in the proportion of the 5th and 7th harmonics in a medium-sized motor;

[0021] Figure 4 for Figure 1 Schematic diagram of the rotor core structure;

[0022] Figure 5 for Figure 4 A magnified view of a section at point B in the middle;

[0023] Figure 6 for Figure 1 Schematic diagram of the change rate of output power of the motor;

[0024] Figure 7 for Figure 1 A graph showing the changes in the proportion of the 5th and 7th harmonics of the motor and the rate of change of the motor's output power.

[0025] Figure 8 A schematic diagram of the rotor core of another embodiment of the motor provided by the present invention;

[0026] Figure 9 This is a cross-sectional view of an embodiment of the compressor provided by the present invention.

[0027] Explanation of icon numbers:

[0028] 100. Stator core; 110. Stator yoke; 120. Stator tooth; 130. Stator slot; 140. Stator slot opening; 150. Rotor hole; 200. Rotor core; 210. Harmonic hole; 220. Magnet slot; 221. Magnet slot wall; 230. Rivet hole;

[0029] 300, Housing section; 310, Main housing; 320, First housing; 330, Second housing; 400, Pump body section; 410, Crankshaft; 420, Cylinder.

[0030] 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

[0031] 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.

[0032] 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.

[0033] 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.

[0034] This invention proposes an electric motor.

[0035] Please refer to Figures 1 to 3 In one embodiment of the present invention, the motor includes:

[0036] The stator core 100 includes a stator yoke 110 and a plurality of stator teeth 120 spaced along the inner circumference of the stator yoke 110. Two adjacent stator teeth 120 and the stator yoke 110 enclose a stator slot 130. The ends of the plurality of stator teeth 120 away from the stator yoke 110 enclose a rotor hole 150. The number of stator slots 130 is Q. Each stator slot 130 has a slot opening 140 communicating with the rotor hole 150. The width of the slot opening 140 in the circumferential direction of the stator core 100 is W. The minimum radius of the rotor hole 150 is R.

[0037] The rotor core 200 is mounted in the rotor hole 150. The rotor core 200 includes multiple circumferentially distributed magnetic slots 220. Between two adjacent magnetic slots 220, the rotor core 200 also has harmonic holes 210. The central angle formed by the harmonic holes 210 and the centers of the rotor core 200 is A1. The number of poles of the motor is 2P, satisfying the following: .

[0038] The technical solution of this invention takes the sum of the central angles of all harmonic holes 210 corresponding to the centers of the rotor core 200 as the total pole arc of the rotor-side harmonic holes 210, and takes the sum of the central angles of all stator teeth 120 of the stator core 100 corresponding to the centers of the rotor core 200 as the total effective armature pole arc of the stator side. Then, it limits the range of the ratio between the total pole arc of the rotor-side harmonic holes 210 and the total effective armature pole arc of the stator side, reflecting the degree of matching between them. When the ratio is in the range of 0.075 to 0.14, the harmonic holes 210 can produce phase cancellation or magnetic circuit blocking effects on the main harmonics excited by the stator armature reaction magnetic field, effectively weakening harmful harmonic components and avoiding increased leakage flux or a sharp increase in the main magnetic circuit reluctance due to excessively large harmonic holes 210. Therefore, this solution achieves harmonic optimization of the magnetic circuit structure without sacrificing the motor's output torque and efficiency, thereby reducing torque fluctuations, improving the motor's operational stability, and reducing motor operating noise.

[0039] It should be noted that the shape of the harmonic aperture 210 can be circular, trapezoidal, rectangular, etc., and the value of the central angle A1 formed by the center of the rotor core 200 corresponding to the harmonic aperture 210 is as follows: Figure 5 As shown, take the minimum distance L1 between two adjacent magnet slots 220, and take the minimum distances L2 and L3 from the harmonic aperture 210 to the two adjacent magnet slots 220 respectively. Calculate the value L4 obtained by L1-L2-L3. Then, take the maximum distance from the harmonic aperture 210 to the center of the rotor core 200 as the radius. Draw a circle with this radius, and take the length of L4 as the arc length of this circle. Calculate the central angle corresponding to this arc length, which is A1. For the rotor-side harmonic aperture 210 total pole arc, This represents the total effective armature arc on the stator side. W is in mm, R is in mm, L1, L2, and L3 are in mm, and A1 is in °. For example... Figure 3 As shown, When it is dimensionless, From 0.05 to 0.11, the proportion of the 5th and 7th harmonics of the motor gradually decreases. From 0.11 to 0.16, the proportion of the 5th and 7th harmonics of the motor gradually increases, showing... When the value is between 0.075 and 0.14, the proportion of the 5th and 7th harmonics of the motor is in the lowest range, between 2.72% and 4.16%, indicating that the harmonic suppression effect is optimal within this range. Specifically, The values ​​can be 0.076, 0.082, 0.088, 0.098, 0.104, 0.11, 0.12, 0.13, or 0.136, etc.

[0040] Furthermore, The value can also be between 0.076 and 0.11, so that the proportion of the 5th and 7th harmonics of the motor is gradually decreasing, from 4.16% to 2.72%, and the setting of the central angle A1 of the harmonic hole 210 can be reduced to ensure the mechanical strength of the rotor core 200.

[0041] In one embodiment, please refer to Figure 2 , Figure 4 and Figure 6 The magnetic slot 220 includes a slot wall 221 disposed towards the outer periphery of the rotor core 200. The central angle formed by the slot wall 221 and the center of the rotor core 200 is A2, satisfying: It should be noted that the unit of A2 is °. The magnetic slot wall 221 is the sidewall of the slot between the two ends of the magnetic slot 220 extending circumferentially along the rotor core 200, facing the outer periphery of the rotor core 200. The shape of the magnetic slot wall 221 varies depending on the shape of the magnetic slot 220. For example, when the magnetic slot 220 is a U-shaped or V-shaped slot, the magnetic slot wall 221 is the inner sidewall of the U-shaped or V-shaped slot. When the magnetic slot 220 is a straight slot, the magnetic slot wall 221 is the straight slot facing the outer periphery of the rotor core 200. The sidewall of the circumference; and the end position of the magnetic slot wall 221 in the circumferential direction of the rotor core 200 is understood as follows: after the magnet is installed in the magnetic slot 220, for a single magnetic pole, the corner of the end of the magnet facing away from the outer periphery of the rotor core 200 in the circumferential direction, and the intersection point with the slot sidewall of the magnetic slot 220, are the end positions of the magnetic slot wall 221 in the circumferential direction of the rotor core 200 that are away from each other. These two end positions are the corner edges of the central angle A2. In this embodiment, the magnetic slot 220 is a V-shaped slot, such as Figure 2 As shown, the endpoint of the magnetic groove wall 221 is the intersection of the extension line of the magnetic groove wall 221 and the extension line of the side wall adjacent to the end of the magnetic steel groove 220.

[0042] It can be understood that the formula in this embodiment represents the matching relationship between the total angle occupied by the magnetic slot 220 and the harmonic holes 210 on both sides within a single magnetic pole region of the rotor and the effective pole arc of a single stator tooth 120. For a single stator tooth 120, the corresponding rotor magnetic circuit is affected by the harmonic holes 210 on both sides and the magnetic slot 220 in the middle. The larger the ratio in this embodiment, the better the suppression effect of the main magnetic flux and the harmonic holes 210. However, since the space under each magnetic pole is limited, when the ratio exceeds this limit, the rate of change of the motor's output power will decrease rapidly. Thus, the limitation... When the ratio is between 6.4 and 7.6, the magnetic pole profile formed by the magnet slot 220 and the harmonic aperture 210 can form a good magnetic resonance suppression match with the spatial distribution of the stator teeth 120. On the one hand, this effectively weakens the local magnetic flux density abrupt change caused by the magnet edge effect and slot opening; on the other hand, it synergistically modulates the spatial distribution of the air gap magnetic field, reducing the 5th and 7th harmonic components. Figure 6 As shown, When it is dimensionless, From 5.5 to 7, the rate of change of motor output power gradually increases. From 7 to 8.5, the rate of change of motor output power gradually decreases, showing... When the value is between 6.4 and 7.6, the motor output power change rate is in the highest range, between 101.00% and 101.8%, indicating a high motor output power change rate, good acceleration, strong handling performance, and optimal harmonic suppression effect. Specifically, The values ​​can be 6.5, 6.6, 6.8, 7.0, 7.2, 7.4, or 7.5, etc.

[0043] In one embodiment, please refer to Figure 1 , Figure 2 and Figure 7 A1 and A2 also satisfy: The values ​​of A1 and A2 are determined as described in the above embodiment and will not be repeated here. This embodiment limits the circumferential size ratio of the harmonic aperture 210 relative to the magnet slot 220 to ensure that the harmonic aperture 210 effectively weakens harmonics and reduces their proportion, especially the 5th and 7th harmonics caused by abrupt changes at the edge of the magnet slot 220 and stator slotting. At the same time, it avoids weakening the main magnetic flux path or causing local magnetic circuit oversaturation due to excessive size, thereby ensuring that the motor output power maintains a high rate of change. Thus, when A1 / A2 is in the range of 0.078 to 0.098, the harmonic aperture 210 can modulate the leakage flux distribution near the edge of the magnet slot 220, smooth the air gap magnetic flux waveform, and reduce the proportion of the 5th and 7th harmonics, thereby effectively suppressing high-frequency components in torque pulsation and reducing torque pulsation to lower noise. Simultaneously, it also effectively increases the rate of change of motor output power, improving NVH performance. For example, Figure 7As shown, A1 / A2 is dimensionless. When A1 / A2 ranges from 0.06 to 0.08, the proportion of the 5th and 7th harmonics of the motor gradually decreases, while the rate of change of motor output power gradually increases. When A1 / A2 ranges from 0.08 to 0.12, the proportion of the 5th and 7th harmonics gradually increases, while the rate of change of motor output power gradually decreases. When A1 / A2 is between 0.078 and 0.098, the proportion of the 5th and 7th harmonics is at its lowest, and the rate of change of motor output power is at its highest, corresponding to a proportion of 4.83% to 5.05% and a rate of change of motor output power between 101.50% and 103.25%. This indicates that the proportion of the 5th and 7th harmonics is low, resulting in less noise. Simultaneously, the rate of change of motor output power is high, leading to better acceleration and stronger handling performance. Specifically... It can take values ​​of 0.079, 0.082, 0.084, 0.089, 0.091, 0.093, 0.095, or 0.097, etc.

[0044] In one embodiment, please refer to Figure 4 and Figure 5 The minimum distance between the harmonic aperture 210 and the outer periphery of the rotor core 200 is d1. At the end of the magnet slot 220 adjacent to the harmonic aperture 210, the minimum distance between the magnet slot 220 and the outer periphery of the rotor core 200 is d2, satisfying the following: Wherein, d1 and d2 are in mm. This embodiment aims to coordinate the magnetic circuit saturation characteristics and mechanical strength between the harmonic aperture 210 region and the end region of the magnet slot 220: if d2 is much larger than d1, the iron core at the end of the magnet slot 220 will be too thick, easily leading to local magnetic concentration, exacerbating harmonic leakage and weakening the modulation effect of the harmonic aperture 210; if d2 is much smaller than d1, the iron core at the end of the magnet slot 220 will be too thin, not only reducing the strength of the rotor structure but also potentially causing premature saturation due to an excessively narrow magnetic circuit, affecting the stability of the main magnetic flux path. By controlling d2 within the range of 0.5d1 to 1.5d1, the radial magnetic reluctance distribution between the harmonic aperture 210 and the adjacent magnet slot 220 ends can be kept relatively balanced, ensuring the effective disturbance capability of the harmonic aperture 210 to the air gap magnetic field while avoiding local saturation or stress concentration caused by abrupt changes in the magnetic circuit at the edge region of the magnet slot 220. Among them, d2 can take values ​​of 0.5d1, 0.8d1, d1, 1.2d1 or 1.5d1, etc.

[0045] In one embodiment, please refer to Figure 1 , Figure 4 and Figure 8The rotor core 200 includes a first diameter passing through the center of the magnet slot 220 in the circumferential direction, and a second diameter passing through the center of the harmonic aperture 210 in the circumferential direction. The harmonic aperture 210 is symmetrically arranged around the second diameter, and the magnet slot 220 is symmetrically arranged around the first diameter. It can be understood that the symmetrical arrangement of the harmonic aperture 210 and the magnet slot 220 around the diameter passing through their circumferential center avoids asymmetry in air gap magnetic flux density caused by positional offset of the magnet slot 220 or the harmonic aperture 210, thereby suppressing the generation of even-order harmonics and unbalanced magnetic pull. During high-speed operation, the symmetrical structure can reduce the radial alternating electromagnetic force on the rotor, reduce vibration excitation sources, and improve operational stability. Furthermore, the dual symmetrical design of the magnet slot 220 and the harmonic aperture 210 enhances the consistency of the magnetic circuit between each magnetic pole, making the back electromotive force waveform more sinusoidal, further reducing torque pulsation and electromagnetic noise.

[0046] In one embodiment, please refer to Figure 8 The rotor core 200 is also provided with a plurality of rivet holes 230 spaced apart circumferentially, and the rivet holes 230 and harmonic holes 210 are spaced apart radially, with the rivet holes 230 communicating with adjacent harmonic holes 210; in another embodiment, please refer to Figure 4 The rivet holes 230 are separated from the adjacent harmonic holes 210. According to the process and structural strength requirements, some rivet holes 230 and adjacent harmonic holes 210 are designed to be connected to form an integrated lamination stacking positioning channel. While ensuring the positioning accuracy and mechanical strength of the rotor core 200 laminations, the integrity of the magnetic circuit and manufacturing feasibility are also taken into account: when the rivet holes 230 and harmonic holes 210 are connected, the lamination mold structure can be simplified and the stamping process can be reduced; when the two are separated, the necessary core bridge is retained to maintain the continuity of the local magnetic flux path and prevent the magnetic circuit from being too narrow or local saturation due to excessive concentration of openings.

[0047] In one embodiment, please refer to Figure 1 Q also satisfies: 2P also satisfies: GCD(Q,P) is the greatest common divisor of Q and P, satisfying: The number of slots per pole and per phase of the motor is q. Q, P, and the number of phases m of the motor satisfy: q = Q / 2mP, where... It can be understood that the motor in this embodiment is a low-slot pole-matching motor with a fractional-slot concentrated winding design. The number of stator slots 130, Q, is controlled between 15 and 18, and the number of pole pairs, P, is controlled between 5 and 6. GCD(Q,P) is 5 or 6, indicating a strong periodic matching relationship between the stator and rotor, which helps to form a highly symmetrical magnetomotive force distribution, thereby reducing cogging torque ripple, torque pulsation, and electromagnetic noise. At the same time, the enhanced periodicity of the cogging matching increases the harmonic order of the cogging torque and reduces its fundamental amplitude, thereby effectively suppressing cogging torque ripple and reducing vibration and noise during motor operation. For example, when Q=18 and P=6, GCD(Q,P)=6, indicating that every 6 poles correspond to one complete magnetic circuit cycle; when Q=15 and P=5, GCD(Q,P)=5, indicating that every 5 poles correspond to one magnetic circuit cycle. In addition, the number of slots per pole per phase, q, satisfies This indicates that each pole has only one or two stator slots 130, with concentrated winding and simplified winding process, thus balancing production cycle and winding equipment capacity, ensuring production efficiency. The stator slots 130 have high slot area utilization, low copper loss, and high efficiency; the magnetomotive force waveform is close to sinusoidal, with low proportions of 5th and 7th harmonics, small torque pulsation, and is conducive to the lightweighting and miniaturization of the motor. Of course, in other embodiments, the number of stator slots 130 Q, the number of pole pairs P, and the number of phases m can be adjusted adaptively according to different application scenarios of the compressor, such as Q being 24, P being 8, and GCD(Q,P) being 8.

[0048] 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 this compressor 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. The compressor is configured as a rotary compressor.

[0049] In one embodiment, please refer to Figure 9 The compressor also includes a pump body 400 and a housing 300. The housing 300 includes a main housing 310 and a first housing 320 and a second housing 330 located at opposite ends of the main housing 310. The motor is located inside the main housing 310. The outer periphery of the stator core 100 is fixed to the inner periphery of the main housing 310. It should be noted that the compressor is configured as a rotary vertical compressor. The pump body 400 includes a crankshaft 410, a bearing, and a cylinder 420. The bearing is located at the axis of the motor rotor. The crankshaft 410 is connected to the rotor and rotates with the rotor. The cylinder 420 is provided with an inlet and an outlet. The rotor drives the crankshaft 410 to rotate, thereby driving the cylinder 420 to switch between the inlet and the outlet to perform work.

[0050] This invention also proposes a refrigeration device, which includes a compressor. The specific structure of the compressor is as described in the above embodiments. Since this refrigeration device 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 elaborated here. The refrigeration device can be configured as a refrigerator, air conditioner, etc.

[0051] 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: A stator core, comprising a stator yoke and a plurality of stator teeth spaced apart along the inner circumference of the stator yoke, wherein two adjacent stator teeth and the stator yoke enclose a stator slot, and one end of the plurality of stator teeth away from the stator yoke encloses a rotor hole, wherein the number of stator slots is Q, the stator slots have stator slot openings communicating with the rotor holes, the width of the stator slot openings in the circumferential direction of the stator core is W, and the minimum radius of the rotor holes is R; as well as The rotor core is mounted in the rotor hole. The rotor core includes multiple circumferentially distributed magnetic slots. Between two adjacent magnetic slots, the rotor core also has harmonic holes. The central angle formed by the harmonic holes and the centers of the rotor core is A1. The motor has 2P poles, satisfying the following: .

2. The motor as described in claim 1, characterized in that, The magnetic slot includes a slot wall facing the outer periphery of the rotor core, and the central angle formed by the slot wall and the center of the rotor core is A2, satisfying: .

3. The motor as described in claim 2, characterized in that, A1 and A2 also satisfy: .

4. The motor as described in claim 1, characterized in that, The minimum distance from the harmonic aperture to the outer periphery of the rotor core is d1. At the end of the magnet slot adjacent to the harmonic aperture, the minimum distance from the magnet slot to the outer periphery of the rotor core is d2, satisfying the following: .

5. The motor as described in claim 1, characterized in that, The rotor core includes a first diameter passing through the center of the magnet slot in the circumferential direction and a second diameter passing through the center of the harmonic hole in the circumferential direction. The harmonic hole is symmetrically arranged around the second diameter, and the magnet slot is symmetrically arranged around the first diameter.

6. The motor as described in claim 1, characterized in that, Q also satisfies: 2P also satisfies: GCD(Q,P) is the greatest common divisor of Q and P, satisfying: .

7. The motor as described in claim 1, characterized in that, The number of slots per pole and per phase of the motor is q, and Q, P, and the number of phases m of the motor satisfy: q = Q / 2mP, where, .

8. The motor as described in any one of claims 1 to 7, characterized in that, The rotor core is also provided with a plurality of rivet holes spaced apart circumferentially, the rivet holes and the harmonic holes spaced apart radially, the rivet holes being connected to adjacent harmonic holes, and / or the rivet holes being separated from adjacent harmonic holes.

9. A compressor, characterized in that, Includes the motor as described in any one of claims 1 to 8.

10. A refrigeration device, characterized in that, Includes the compressor as described in claim 9.

Images