Electric machine, compressor and refrigeration plant

Abstract

This invention discloses an electric motor, a compressor, and a refrigeration device, relating to the field of permanent magnet motor technology. The motor includes a stator core and a rotor core. A rotor hole is formed on the inner circumference of the stator core, with a minimum radius of R1. Harmonic holes are also provided between two adjacent magnet slots on the rotor core. The outer circumference of the rotor core includes alternating straight and arc-shaped segments. The straight segments correspond to the harmonic holes, and the arc-shaped segments correspond to the magnet slots. At the center of the rotor core, the central angle of the arc-shaped segment is A1, and the central angle of the straight segment is A2. The maximum radius of the rotor core is R2, and the minimum distance from the straight segment to the center of the rotor core is R3, satisfying the following conditions: The technical solution provided by this invention aims to reduce the torque pulsation of the motor, thereby reducing the operating 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] In related technologies, due to the periodicity of the stator and rotor structure and the nonlinearity of the magnetic circuit, the air gap magnetic flux density inevitably contains abundant spatial harmonic components. These harmonics not only cause additional eddy current losses, but also interact with the stator windings to generate significant torque pulsations, thereby exciting structural vibrations and electromagnetic noise, affecting the smoothness and comfort of motor operation. Summary of the Invention

[0003] The main objective of this invention is to provide an electric motor, compressor, and refrigeration device that aims to reduce torque pulsation in the motor, thereby reducing the operating noise of the motor.

[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 the ends of the plurality of stator teeth away from the stator yoke enclose a rotor hole, wherein the number of stator slots is Q, and the minimum radius of the rotor hole is R1; and

[0006] A rotor core is mounted in the rotor hole. The rotor core includes multiple magnetic slots spaced circumferentially. Between two adjacent magnetic slots, the rotor core also has harmonic holes. The outer periphery of the rotor core includes alternating straight and arc-shaped segments. The straight segments correspond to the harmonic holes, and the arc-shaped segments correspond to the magnetic slots. The central angle formed by the arc-shaped segments and the center of the rotor core is A1, and the central angle formed by the straight segments and the center of the rotor core is A2. The maximum radius of the rotor core is R2, and the minimum distance from the straight segments to the center of the rotor core is R3. The motor has 2P poles, and GCD(Q,P) is the greatest common divisor of Q and P, satisfying: .

[0007] In one embodiment, the area of ​​the harmonic aperture is S1, and it also satisfies:

[0008] 0.99≤ ≤1.03.

[0009] 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 A3, satisfying: .

[0010] In one embodiment, the minimum distance between the magnet slot and the center of the rotor core is d1, and the minimum distance between the harmonic aperture and the center of the rotor core is d2, satisfying: , and / or .

[0011] In one implementation, the following is also satisfied: .

[0012] In one implementation, Q satisfies: 2P satisfies: GCD(Q,P) satisfies: .

[0013] 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 / mP, where, .

[0014] In one embodiment, on the cross-section of the rotor core, the magnet slot is in the shape of a straight line, and the two ends of the magnet slot are respectively arranged opposite to two adjacent harmonic holes.

[0015] 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.

[0016] The present invention also proposes a compressor, which includes a motor as described above.

[0017] The present invention also proposes a refrigeration device, which includes a compressor as described above.

[0018] The technical solution of this invention limits the central angle of the air gap at the straight section corresponding to the center of the rotor core, and combines this with the greatest common divisor of Q and P, GCD(Q,P), to a ratio limit with the central angle of the air gap at the arc section corresponding to the center of the rotor core. By utilizing the radial alignment of the straight section and harmonic apertures along the rotor core, the local air gap magnetic reluctance in the corresponding region is increased, weakening specific-order harmonics excited by stator slotting and magnetic pole edge effects, thereby suppressing the amplitude of radial electromagnetic force waves. Simultaneously, the arc section and magnetic... The steel slots are arranged radially along the rotor core, and the arc-shaped section retains a small and uniform air gap to ensure the main magnetic flux path is unobstructed and maintain a high average air gap magnetic flux density. Furthermore, the integer factor GCD(Q,P), which reflects the pole-slot coupling strength, is used for coupling constraint. This avoids the attenuation of the main magnetic flux due to the excessively large straight section and prevents the inability to effectively suppress torque pulsation due to insufficient air gap modulation. This helps to form a magnetomotive force distribution with high symmetry, thereby reducing the torque pulsation of the motor and thus reducing the operating noise of the motor. 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 A schematic diagram of the structure of an embodiment of the motor provided by the present invention;

[0021] Figure 2 for Figure 1 A magnified view of a section at point A in the middle;

[0022] Figure 3 for Figure 1 A graph showing the change in the proportion of torque ripple in the motor.

[0023] Figure 4 for Figure 1 Schematic diagram of the rotor core structure;

[0024] Figure 5 for Figure 4 A magnified view of a section at point B in the middle;

[0025] Figure 6 for Figure 1 Schematic diagram of noise excitation generated by the pulsation of the electric motor;

[0026] Figure 7 for Figure 1 A graph showing the relationship between the torque ripple ratio of a motor and the change in motor power.

[0027] Figure 8 This is a schematic diagram of a compressor according to an embodiment of the present invention.

[0028] Explanation of icon numbers:

[0029] 100. Stator core; 110. Stator yoke; 120. Stator tooth; 130. Stator slot; 140. Rotor hole; 200. Rotor core; 210. Harmonic hole; 220. Magnet slot; 221. Magnet slot wall; 230. Straight section; 240. Arc section;

[0030] 300, Housing section; 310, Main housing; 320, First housing; 330, Second housing; 400, Pump body section; 410, Crankshaft; 420, Cylinder.

[0031] 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

[0032] 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.

[0033] 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.

[0034] 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.

[0035] This invention proposes an electric motor.

[0036] Please refer to Figures 1 to 3 and Figure 5 In one embodiment of the present invention, the motor includes:

[0037] 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 140. The number of stator slots 130 is Q, and the minimum radius of the rotor hole 140 is R1.

[0038] The rotor core 200 is mounted in the rotor hole 140. The rotor core 200 includes multiple circumferentially spaced magnetic slots 220. Between adjacent magnetic slots 220, the rotor core 200 also has harmonic holes 210. The outer periphery of the rotor core 200 includes alternating straight sections 230 and arc sections 240. The straight sections 230 correspond to the harmonic holes 210, and the arc sections 240 correspond to the magnetic slots 220. The central angle formed by the arc sections 240 and the center of the rotor core 200 is A1, and the central angle formed by the straight sections 230 and the center of the rotor core 200 is A2. The maximum radius of the rotor core 200 is R2, and the minimum distance from the straight section 230 to the center of the rotor core 200 is R3. The number of poles of the motor is 2P, and GCD(Q,P) is the greatest common divisor of Q and P, satisfying: .

[0039] The technical solution of this invention limits the central angle of the air gap at the position of the straight section 230 corresponding to the center of the rotor core 200, and combines it with the greatest common divisor of Q and P, GCD(Q,P), to limit the ratio with the central angle of the air gap at the position of the arc section 240 corresponding to the center of the rotor core 200. By utilizing the radial alignment of the straight section 230 and the harmonic aperture 210 along the rotor core 200, the local air gap magnetic reluctance in the corresponding region is increased, weakening the specific order harmonics excited by the stator slotting and magnetic pole edge effect, thereby suppressing the amplitude of the radial electromagnetic force wave; at the same time, the arc section 240... Segment 240 and magnet slot 220 are arranged radially correspondingly along the rotor core 200. The arc-shaped segment 240 retains a small and uniform air gap to ensure that the main magnetic flux path is unobstructed and maintain a high average air gap magnetic flux density. Furthermore, the integer factor GCD(Q,P), which reflects the pole-slot coupling strength, is used for coupling constraint. This avoids the attenuation of the main magnetic flux caused by the excessive size of the straight segment 230, and also prevents the inability to effectively suppress torque pulsation due to insufficient air gap modulation. This helps to form a magnetomotive force distribution with high symmetry, thereby reducing the torque pulsation of the motor and thus reducing the operating noise of the motor.

[0040] It should be noted that the central angle A2 of the straight segment 230 corresponding to the center of the rotor core 200 is determined as follows: the intersection points of the extension lines of the two furthest ends of the straight segment 230 with the adjacent arc segment 240 in the circumference of the rotor core 200 are the edges of the central angle A2. Similarly, the central angle A1 of the arc segment 240 corresponding to the center of the rotor core 200 is determined as follows: the intersection points of the extension lines of the two furthest ends of the arc segment 240 with the adjacent straight segment 230 in the circumference of the rotor core 200 are the edges of the central angle A1. The straight segment 230 is formed by cutting the outer circumference of the rotor core 200. Therefore, on the cross-section of the rotor core 200, the straight segment 230 can be a straight line, or a slightly concave or convex arc; similarly, the arc segment 240 can be a circular arc or an arc with gradually changing curvature. This can be understood as... The total pole arc of the air gap at the position of the straight section 230 corresponds to the center of the rotor core 200. The air gap at the position of the arc segment 240 corresponds to the total pole arc of the rotor core 200. R1, R2, R3, and d1, d2, d3 (hereinafter referred to as d1, d2, d3) are in mm, and A1, A2, and A3 (hereinafter referred to as A3) are in °. Among them, the straight segment 230 is located on the two circumferentially distant sides of the rotor core 200, and needs to be at least partially arranged opposite to the magnet slot 220 along the radial direction of the rotor core 200, so that the central angle of the magnet slot 220 corresponding to the center of the rotor core 200 is greater than A1.

[0041] like Figure 3 As shown, Dimensionless, in From 0.65 to 0.8, the proportion of torque ripple in the motor gradually decreases. From 0.8 to 0.9, the proportion of torque ripple in the motor gradually increases, exhibiting... Between 0.73 and 0.84, the torque ripple percentage of the motor is at its lowest, ranging from 11.62% to 8.73%, indicating good suppression of torque ripple and low noise during motor operation within this range. Specifically, The values ​​can be 0.73, 0.75, 0.77, 0.79, 0.80, 0.82, or 0.84, etc.

[0042] In one embodiment, please refer to Figure 1 , Figure 4 , Figure 5 and Figure 6 The area of ​​harmonic aperture 210 is S1, and it also satisfies: 0.99 ≤ ≤1.03. It should be noted that S1 is the area of ​​a single harmonic aperture 210. The area removed during the forming of the straight section 230. This is the area of ​​the largest annulus formed by the straight section 230 and the arc section 240 of the rotor core 200. The formula in this embodiment essentially couples the area S1 of the harmonic aperture 210 with the geometric characteristics of the fan-ring region corresponding to the straight section 230 and the number of motor poles 2P. That is, it is the sum of the total pole arcs of the rotor-side harmonic aperture 210 and the straight section 230. Then, the ratio of the sum of the total pole arcs of the rotor-side harmonic aperture 210 and the straight section 230 to the largest annulus formed by the straight section 230 and the arc section 240 is determined, ensuring that this ratio is close to 1, so that the surface of the rotor core 200 hollowed out by the rotor-side harmonic aperture 210 and the straight section 230... The area is close to the area of ​​the largest annulus formed by the straight section 230 and the arc section 240 of the rotor core 200. This achieves both enhanced suppression of leakage flux and ensures good density of the main magnetic flux while effectively reducing the air gap width. In other words, it avoids insufficient reduction of the main order harmonics due to an excessively small effective area for harmonic suppression, nor excessive increase in the air gap leading to weakened magnetic flux due to an excessively large area. Thus, while suppressing high-order harmonics of the air gap magnetic flux density, it maintains the symmetry of the magnetic circuit and good magnetic flux density, thereby reducing noise excitation caused by torque pulsation. Figure 6 As shown, Dimensionless From 0.97 to 1.01, the proportion of noise excitation generated by pulsation gradually decreases. From 1.01 to 1.05, the proportion of noise excitation generated by pulsation gradually increases, showing... When the value is between 0.99 and 1.03, the proportion of noise excitation caused by torque pulsation is in a low range, between 96.33% and 98.96%, indicating that the noise excitation caused by torque pulsation in the motor is low, reflecting a good harmonic suppression effect. Specifically, The value can be 0.99, 1.00, 1.01, 1.02 or 1.03.

[0043] In one embodiment, please refer to Figure 5 and Figure 7 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 A3, satisfying: It should be noted that the magnetic slot wall 221 is the side wall of the magnetic slot 220 extending circumferentially along the rotor core 200 between the two ends and 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 side wall of the U-shaped or V-shaped slot. When the magnetic slot 220 is a straight slot, the magnetic slot wall 221 is the side wall of the straight slot facing the outer periphery of the rotor core 200. The position of the magnetic slot wall 221 at the circumferential end of the rotor core 200 can be 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, which is farthest from the outer periphery of the rotor core 200, intersects with the slot sidewall of the magnetic slot 220. These two endpoints are the corner edges of the central angle A3. In this embodiment, the magnetic slot 220 is a straight slot, such as... Figure 5 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.

[0044] It is understood that, in this embodiment, the limitation is... Between 0.88 and 0.92, the aim is to control the central angle A1 of the arc segment 240 to be smaller than the central angle A3 corresponding to the magnetic pole, thereby ensuring that the central angle A2 of the straight segment 230 partially coincides with the central angle A3 corresponding to the magnetic pole. This ensures the effectiveness of the straight segment 230 in adjusting the air gap, suppressing magnetic leakage, and effectively balancing the continuity and uniformity of the main magnetic flux path. This reduces torque ripple while ensuring the effective power of the motor. When A1 / A3 is too small, the air gap area of ​​the arc segment 240 is excessively smaller than the magnetic pole area, easily leading to magnetic flux concentration at the air gap edge, causing local saturation and generating higher harmonics, resulting in large torque ripple. Simultaneously, the straight segment 230 occupies too large an area, leading to excessive magnetic circuit saturation and suppressing the effective power of the motor. Conversely, when A1 / A3 is too large, the arc segment 240 exceeds the effective working area of ​​the magnet, not only wasting material but also weakening the average magnetic flux density due to the expansion of the ineffective air gap area, reducing motor power. For example, Figure 7 As shown, Dimensionless When the value ranges from 0.86 to 0.92, the proportion of torque ripple in the motor gradually decreases. When the value ranges from 0.92 to 0.94, the proportion of torque ripple in the motor gradually increases; As the value ranges from 0.86 to 0.92, the motor power gradually increases. As the value ranges from 0.9 to 0.94, the motor power gradually decreases; exhibiting... When the value is between 0.88 and 0.92, the motor's torque ripple ratio is in the lowest range, and the motor's power is in the highest range. This corresponds to a torque ripple ratio between 9.88% and 11.31% and a motor power between 101.12% and 101.45%, indicating a low torque ripple ratio, low noise, and high motor power. Specifically... It can take values ​​of 0.88, 0.89, 0.90, 0.91, or 0.92, etc.

[0045] In one embodiment, please refer to Figure 4 The minimum distance between the center of the magnet slot 220 and the center of the rotor core 200 is d1, and the minimum distance between the center of the harmonic hole 210 and the center of the rotor core 200 is d2, satisfying the following: , and / or On the one hand, the ratio of d2 to d1 is close to 1, indicating that the burial depth of the harmonic aperture 210 and the magnetic slot 220 in the radial direction of the rotor core 200 is basically the same, avoiding abrupt changes in the local magnetic circuit or stress concentration due to excessive depth differences, thereby maintaining the mechanical strength and magnetic circuit symmetry of the rotor structure. On the other hand, d2 is slightly smaller than R3 but remains within the range of 0.89 to 0.95, ensuring that the harmonic aperture 210 is located at an appropriate position inside the straight section 230. This effectively modulates the magnetic permeability distribution in the corresponding air gap region to weaken harmonics, without weakening the inter-pole structural strength of the rotor or causing the risk of local demagnetization due to being too close to the outer edge of the rotor. The values ​​are 0.92, 0.96, 0.98, 1.00, 1.04, 1.06, or 1.08. The values ​​can be 0.89, 0.91, 0.92, 0.94, or 0.95, etc.

[0046] Furthermore, in this embodiment, please refer to Figure 4 and Figure 5 It also satisfies: That's understandable. The relative widths of the straight section 230 and the arc section 240 in the circumferential direction are limited, thereby achieving fine control over the air gap magnetic permeability distribution. If A2 / A1 is too small, the straight section 230 will be too short, failing to provide a sufficient high reluctance region to weaken harmonics caused by stator slotting and pole switching; if A2 / A1 is too large, the proportion of the straight section 230 will be too high, not only compressing the effective path of the main magnetic flux, leading to a decrease in the average air gap magnetic flux density, but also potentially introducing new magnetic circuit asymmetry, exacerbating torque ripple. By controlling A2 / A1 within the range of 0.50 to 0.54, with the straight section 230 and the arc section 240 grouped together, and the straight section 230 accounting for slightly more than 1 / 3, a reasonable alternation between the high and low reluctance regions is achieved in the circumferential direction. This retains sufficient main magnetic flux channels to maintain high torque output capability while suppressing the amplitude of specific-order electromagnetic force waves, ensuring motor power while reducing torque ripple. The value can be 0.50, 0.51, 0.52, 0.53 or 0.54.

[0047] In one embodiment, please refer to Figure 2 and Figure 5 In the cross-section of the rotor core 200, the magnet slots 220 are in a straight line, with each end of the slot facing an adjacent harmonic aperture 210. The magnet slots 220 extend between the adjacent harmonic apertures 210, exhibiting a tangential arrangement. This ensures that the magnetization direction of the embedded permanent magnets is radial or nearly radial, highly matching the direction of the armature magnetic field generated by the stator windings. This improves the sinusoidal nature of the air gap magnetic flux density and the effective magnetic flux utilization rate. Simultaneously, the straight-line tangential arrangement of the magnet slots 220 is simple in structure and easy to manufacture. Furthermore, during high-speed rotor rotation under centrifugal force, the radial tensile stress distribution on the magnets is more uniform, reducing the risk of magnet detachment or cracking. In addition, the arrangement of the permanent magnets in this embodiment avoids the local magnetic circuit distortion and increased magnetic leakage that may be caused by complex V-shaped or U-shaped magnet slot structures, helping to maintain magnetic circuit symmetry and further suppressing torque pulsation and electromagnetic noise.

[0048] In one embodiment, please refer to Figure 4 and Figure 5The 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 structural form of the magnet slot 220 and the harmonic aperture 210 in this embodiment ensures a high degree of symmetry in the geometry and magnetic reluctance distribution of the magnetic circuit within each magnetic pole unit, avoiding local magnetic flux density unevenness and unilateral magnetic pull caused by the bias of the magnet slot 220 or the harmonic aperture 210, thereby suppressing the generation of low-order unbalanced electromagnetic forces. Simultaneously, the symmetrical arrangement of the harmonic aperture 210 around the second diameter ensures that its modulation effect on the air gap permeability is evenly distributed on both sides of the circumference, which not only enhances the ability to cancel harmonics but also avoids the introduction of new asymmetric harmonic components. 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. Of course, in other embodiments, the second diameter also passes through the midpoint of the straight segment 230 in the circumferential direction of the rotor core 200, so that the straight segment 230 is symmetrically arranged around the second diameter, and the first diameter also passes through the midpoint of the arc segment 240 in the circumferential direction of the rotor core, so that the arc segment 240 is symmetrically arranged around the first diameter.

[0049] In one embodiment, please refer to Figure 1 and Figure 4 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 / mP, 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 harmonic content and small torque pulsation, which is beneficial for the lightweight 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 the different application scenarios of the compressor, such as Q being 24, P being 8, and GCD(Q,P) being 8.

[0050] 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.

[0051] In one embodiment, please refer to Figure 8 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.

[0052] 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.

[0053] 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 stator core includes a stator yoke and a plurality of stator teeth spaced apart along the inner circumference of the stator yoke. Two adjacent stator teeth and the stator yoke enclose a stator slot. The ends of the plurality of stator teeth away from the stator yoke enclose a rotor hole. The number of stator slots is Q, and the minimum radius of the rotor hole is R1. as well as A rotor core is mounted in the rotor hole. The rotor core includes multiple magnetic slots spaced circumferentially. Between two adjacent magnetic slots, the rotor core also has harmonic holes. The outer periphery of the rotor core includes alternating straight and arc-shaped segments. The straight segments correspond to the harmonic holes, and the arc-shaped segments correspond to the magnetic slots. The central angle formed by the arc-shaped segments and the center of the rotor core is A1, and the central angle formed by the straight segments and the center of the rotor core is A2. The maximum radius of the rotor core is R2, and the minimum distance from the straight segments to the center of the rotor core is R3. The motor has 2P poles, and GCD(Q,P) is the greatest common divisor of Q and P, satisfying: .

2. The motor as described in claim 1, characterized in that, The area of ​​the harmonic aperture is S1, and it also satisfies 0.99 ≤ ≤1.

03.

3. 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 A3, satisfying: .

4. The motor as described in claim 1, characterized in that, The minimum distance from the magnetic slot to the center of the rotor core is d1, and the minimum distance from the harmonic aperture to the center of the rotor core is d2, satisfying the following: , and / or .

5. The motor as described in claim 1, characterized in that, Also satisfies: .

6. The motor as described in claim 1, characterized in that, Q satisfies: 2P satisfies: GCD(Q,P) satisfies: .

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 / mP, where, .

8. The motor as described in any one of claims 1 to 7, characterized in that, On the cross-section of the rotor core, the magnet slot is in the shape of a straight line, and the two ends of the magnet slot are respectively arranged opposite to the two adjacent harmonic holes; And / or, 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 about the second diameter, and the magnet slot being symmetrically arranged about the first diameter.

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.

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