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; an inter-pole slot is concavely arranged on the outer periphery of the rotor core between two adjacent magnetic steel slots, the outer periphery of the rotor core is further concavely arranged with n interval distributed harmonic slots in sequence, the center angle of the n harmonic slots is A1, A2, An in sequence on the center of the rotor core, the center angle of the inter-pole slot is As, the pole number of the motor is 2P, and the following conditions are met: 2Pn = Q, 2Pn = 2Q, 2Pn = 3Q, 2Pn = 4Q, 2Pn = 5Q, 2Pn = 6Q, 2Pn = 7Q, 2Pn = 8Q, 2Pn = 9Q, 2Pn = 10Q, 2Pn = 11Q, 2Pn = 12Q, 2Pn = 13Q, 2Pn = 14Q, 2Pn = 15Q, 2Pn = 16Q, 2Pn = 17Q, 2Pn = 18Q, 2Pn = 19Q, 2Pn = 20Q, 2Pn = 21Q, 2Pn = 22Q, 2Pn = 23Q, 2Pn = 24Q, 2Pn = 25Q, 2Pn = 26Q, 2Pn = 27Q, 2Pn = 28Q, 2Pn = 29Q, 2Pn = 30Q

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 pulsation, 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] A rotor core is mounted in the rotor hole. The rotor core includes a plurality of circumferentially spaced magnetic slots. Between two adjacent magnetic slots, an inter-pole slot is recessed on the outer circumference of the rotor core. The rotor core includes a first diameter passing through the center of the magnetic slots in the circumferential direction. From the inter-pole slot to the adjacent first diameter, n harmonic slots are also sequentially recessed on the outer circumference of the rotor core. The central angles formed by the n harmonic slots corresponding to the centers of the rotor core are A1, A2, ..., An, respectively. The central angle formed by the inter-pole slots corresponding to the centers of the rotor core is As. The number of poles of the motor is 2P, and n is greater than or equal to 1, satisfying: .

[0007] In one embodiment, n equals 2, and from the inter-pole slot to the adjacent first diameter, the two harmonic slots are respectively the first harmonic slot and the second harmonic slot, satisfying: .

[0008] In one embodiment, the outer peripheral wall of the rotor core includes a first outer wall between the first diameter and the adjacent second harmonic slot, and a second outer wall between the second harmonic slot and the adjacent first harmonic slot. The first outer wall, the second harmonic slot, and the second outer wall are connected sequentially, and the central angle formed by the corresponding center of the rotor core is a1, and the central angle formed by the first outer wall corresponding to the center of the rotor core is a2, satisfying: , and / or .

[0009] In one embodiment, the minimum distance from the bottom of the first harmonic slot to the center of the rotor core is d1, the minimum distance from the bottom of the second harmonic slot to the center of the rotor core is d2, and the minimum distance from the bottom of the inter-pole slot to the center of the rotor core is ds, satisfying: , and / or .

[0010] In one implementation, the following is also satisfied: .

[0011] In one embodiment, n equals 2, and from the inter-pole slot to the adjacent first diameter, the two harmonic slots are respectively the first harmonic slot and the second harmonic slot, satisfying: .

[0012] In one implementation, 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... .

[0013] In one embodiment, the magnet slots are symmetrically arranged around the first diameter, and the inter-pole slots and n harmonic slots are symmetrically distributed around the first diameter.

[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 slots and inter-pole slots corresponding to the centers of the rotor core as the total arc of the rotor-side harmonic slots, and takes the sum of the central angles of all stator teeth of the stator core 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 slots 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 0.25 to 0.4, the harmonic slots and inter-pole slots can produce phase cancellation or magnetic circuit blocking effects on the main harmonics excited by the stator armature reaction magnetic field. This avoids suppression failure caused by insufficient harmonic modulation and prevents weakening of the main magnetic flux and increase in iron loss caused by excessive slotting, thereby optimizing torque ripple and electromagnetic noise while ensuring electromagnetic performance. Therefore, this solution effectively suppresses harmonics 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 This is 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 A graph showing the torque pulsation of a medium-sized motor;

[0024] Figure 7 for Figure 1 A graph showing the variation of the 5th and 7th harmonic proportions of the motor in another embodiment;

[0025] Figure 8 for Figure 1 Schematic diagram of the change rate of output power of the motor;

[0026] Figure 9 This is a schematic diagram of a compressor according to an embodiment of 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 slot; 211. First harmonic slot; 212. Second harmonic slot; 220. Magnet slot; 230. Inter-pole slot; 240. First outer wall; 250. Second outer wall;

[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 Figure 1 , Figure 2 and Figure 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] A rotor core 200 is mounted in a rotor hole 150. The rotor core 200 includes multiple circumferentially spaced magnetic slots 220. Between two adjacent magnetic slots 220, an inter-pole slot 230 is recessed on the outer periphery of the rotor core 200. The rotor core 200 includes a first diameter passing through the center of the magnetic slots 220 in the circumferential direction. From the inter-pole slot 230 to the adjacent first diameter, n inter-pole harmonic slots 210 are also sequentially recessed on the outer periphery of the rotor core 200. The central angles formed by the n harmonic slots 210 corresponding to the centers of the rotor core 200 are A1, A2, ..., An, respectively. The central angle formed by the inter-pole slots 230 corresponding to the centers of the rotor core 200 is As. The number of poles of the motor is 2P, and n is greater than or equal to 1, satisfying: .

[0038] The technical solution of this invention takes the sum of the central angles of all harmonic slots 210 and inter-pole slots 230 corresponding to the center of the rotor core 200 as the total pole arc of the rotor-side harmonic slots 210, and takes the sum of the central angles of all stator teeth 120 of the stator core 100 corresponding to the center 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 slots 210 and the total effective armature pole arc of the stator side, reflecting the degree of matching between the total pole arc of the rotor-side harmonic slots 210 and the effective armature pole arc of the stator side. When the ratio is in the range of 0.25 to 0.4, the harmonic slots 210 and inter-pole slots 230 can produce phase cancellation or magnetic circuit blocking effects on the main harmonics excited by the stator armature reaction magnetic field. This avoids the suppression failure caused by insufficient harmonic modulation and prevents the weakening of the main magnetic flux and the increase of iron loss caused by excessive slotting. Thus, while ensuring electromagnetic performance, it achieves optimized torque ripple and electromagnetic noise. Therefore, this solution effectively suppresses harmonics without sacrificing motor output torque and efficiency, thereby reducing torque fluctuations, improving motor operating stability, and reducing motor operating noise.

[0039] It should be noted that the central angles A1, A2, ..., An formed by the centers of the n harmonic slots 210 and the rotor core 200 are determined as follows: An arc-shaped outer wall, distinct from the harmonic slots 210 and the inter-pole slots 230, is provided on the outer periphery of the rotor core 200. In the circumferential direction of the rotor core 200, the intersection points of the extension lines of the harmonic slots 210 on their respective farthest sides with the extension lines of their respective adjacent arc-shaped outer walls are used as the edges of the central angles. Similarly, the central angle As formed by the centers of the inter-pole slots 230 and the rotor core 200 is the intersection point of the extension lines of the inter-pole slots 230 on their respective farthest sides with the extension lines of their respective adjacent arc-shaped outer walls, and the edges of the central angle As are used as the edges of the central angle As. The total pole arc of all harmonic slots 210 in the rotor core 200. The total pole arc of all inter-pole slots 230 in the rotor core 200. The total effective armature arc on the stator side is represented by W in mm and R in mm. The units for A1, A2, ..., An, As are in °. Regarding the position of the harmonic slots 210, on the circumference of the rotor core 200, n harmonic slots 210 are sequentially distributed at intervals from the end of the magnet slot 220 to the first diameter. The harmonic slots 210 can be located adjacent to the first diameter or adjacent to the end of the magnet slot 220. On the outer circumference of the rotor core 200 corresponding to the peripheral wall of the magnet slot 220, with the first diameter as the dividing line, n harmonic slots 210 are respectively arranged on opposite sides of the first diameter.

[0040] In this embodiment, n equals 2. From the inter-pole slot 230 to the adjacent first diameter, the two harmonic slots 210 are the first harmonic slot 211 and the second harmonic slot 212, respectively, satisfying: It should be noted that, between the inter-pole slot 230 and the adjacent first diameter, two harmonic slots 210 are provided on the outer periphery of the rotor core 200, namely the first harmonic slot 211 and the second harmonic slot 212. These can produce phase cancellation or magnetic circuit blocking effects on the 5th and 7th harmonics excited by the stator armature reaction magnetic field, preventing the weakening of the main magnetic flux and the increase of iron loss caused by excessive slotting. Thus, while ensuring electromagnetic performance, torque pulsation and electromagnetic noise are reduced. For example, Figure 3 As shown, When it is dimensionless, When the value of is between 0.15 and 0.35, the proportion of the 5th and 7th harmonics of the motor gradually decreases. When the value of is between 0.35 and 0.45, the proportion of the 5th and 7th harmonics of the motor gradually increases, exhibiting... When the value is in the range of 0.25 to 0.4, the proportion of the 5th and 7th harmonics of the motor is in the lowest range, between 2.72% and 4.43%, indicating that the suppression effect of the 5th and 7th harmonics is optimal within this range. Specifically, The value can be 0.26, 0.3, 0.35 or 0.39, etc.

[0041] In one embodiment, please refer to Figure 1 , Figure 2 and Figure 6 It also satisfies: It can be understood that the formula in this embodiment represents the matching relationship between the total angle occupied by the harmonic slot 210 and the inter-pole slots 230 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 inter-pole slots 230 on both sides and the harmonic slot 210 in the middle. The larger the ratio of the formula in this embodiment, the better the suppression effect of the main magnetic flux and the harmonic slots 210 and inter-pole slots 230. 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. Therefore, it is crucial to ensure that the harmonic modulation structure on the rotor side is precisely matched spatially with the magnetic field excitation region of a single stator tooth 120, fully covering the area where high-order harmonics are easily generated at the edge of the stator tooth 120, while avoiding excessive extension to the center region of the main magnetic pole, which would weaken the effective magnetic flux.

[0042] Furthermore, in this embodiment, please refer to Figure 1 , Figure 2 and Figure 6 n equals 2. From the inter-pole slot 230 to the adjacent first diameter, the two harmonic slots 210 are the first harmonic slot 211 and the second harmonic slot 212, respectively, satisfying: It should be noted that, between the inter-pole slot 230 and the adjacent first diameter, two harmonic slots 210 are provided on the outer periphery of the rotor core 200, namely the first harmonic slot 211 and the second harmonic slot 212. These can produce phase cancellation or magnetic circuit blocking effects on the 5th and 7th harmonics excited by the stator armature reaction magnetic field, preventing the weakening of the main magnetic flux and the increase of iron loss caused by excessive slotting. Thus, while ensuring electromagnetic performance, torque pulsation and electromagnetic noise are reduced. For example, Figure 6 As shown, When it is dimensionless, When the value ranges from 0.55 to 0.65, the proportion of torque ripple in the motor decreases. When the value of increases from 0.65 to 0.70, the proportion of torque ripple in the motor increases, exhibiting... When the value is between 0.60 and 0.70, the torque ripple ratio of the motor is in the lowest range, between 3.42% and 5.72%, indicating that the motor has low torque ripple and low vibration noise. Specifically, It can take values ​​of 0.61, 0.63, 0.65, 0.67, or 0.69, etc.

[0043] In one embodiment, please refer to Figure 4 , Figure 5 , Figure 7 and Figure 8 The outer peripheral wall of the rotor core 200 includes a first outer wall 240 between the first diameter and the adjacent second harmonic slot 212, and a second outer wall 250 between the second harmonic slot 212 and the adjacent first harmonic slot 211. The first outer wall 240, the second harmonic slot 212, and the second outer wall 250 are connected sequentially, and the central angle formed by the corresponding centers of the rotor core 200 is a1, and the central angle formed by the first outer wall 240 and the corresponding centers of the rotor core 200 is a2, satisfying: , and / or It can be understood that the units of a1 and a2 are degrees. a1 represents the central angle of the rotor core 200's outer peripheral wall between the first harmonic slot 211 and the first diameter, corresponding to the center of the rotor core 200. a2 represents the central angle of the rotor core 200's outer peripheral wall between the second harmonic slot 212 and the first diameter, corresponding to the center of the rotor core 200. Given a1 and a2, by changing the lengths of the first outer wall 240 and the second outer wall 250, the values ​​of a1 and a2 can be changed, thereby adjusting the position of the first harmonic slot 211 relative to the second harmonic slot 212. Thus, the... Between 0.46 and 0.58, taking a pole pair number P equal to 5 as an example, the value of a2 is limited to between 3.5° and 5.5°. This results in the length of the first outer wall 240 being greater than the length of the second outer wall 250, and the length of the first outer wall 240 being nearly twice the length of the second outer wall 250. This allows the outer wall near the first diameter to retain a suitable magnetic circuit width to maintain the integrity of the main magnetic flux path. Simultaneously, the air gap thickness is appropriately increased near the inter-pole region to improve leakage flux resistance and enhance local magnetic permeability modulation capability, thereby suppressing harmonic density and ensuring the motor's output power.

[0044] Among them, such as Figure 7 As shown, Dimensionless When the value ranges from 0.38 to 0.54, the proportions of the 5th and 7th harmonics decrease. When the value ranges from 0.54 to 0.66, the proportions of the 5th and 7th harmonics increase, showing... When the value is between 0.46 and 0.58, the proportion of the 5th and 7th harmonics of the motor is in the lowest range, between 4.47% and 4.79%, indicating that the motor has low torque ripple and low vibration noise; specifically, The values ​​of a2 are 0.47, 0.48, 0.5, 0.52, 0.54, or 0.57, etc. For the values ​​of a2, such as... Figure 8 As shown, when the value of a2 ranges from 3° to 4.5°, the rate of change of motor output power gradually increases. When the value of a2 ranges from 4.5° to 6.5°, the rate of change of motor output power gradually decreases. When the value of a2 is between 3.5° and 5.5°, the rate of change of motor output power is in the highest range, between 100.23% and 102.89%, indicating that the motor has a better acceleration effect and stronger handling performance.

[0045] In one embodiment, please refer to Figure 4 The minimum distance from the bottom of the first harmonic slot 211 to the center of the rotor core 200 is d1, the minimum distance from the bottom of the second harmonic slot 212 to the center of the rotor core 200 is d2, and the minimum distance from the bottom of the inter-pole slot 230 to the center of the rotor core 200 is ds, satisfying the following: , and / or It can be understood that d1, d2, and ds respectively reflect the groove depths of the first harmonic groove 211, the second harmonic groove 212, and the inter-electrode groove 230, thus defining... Between 0.98 and 1.02, it is ensured that the bottoms of the first harmonic slot 211 and the second harmonic slot 212 are approximately on the same circumference radially, meaning the slot depths of the harmonic slots 210 are consistent or have only slight differences, thus forming a continuous and gentle magnetic permeability modulation profile on the outer periphery of the magnet slot 220. If the difference in slot depth is too large, it will cause a sudden change in local magnetic reluctance on the outer side of the magnet slot 220. Similarly, the following limits are applied... Between 0.982 and 1.005, the depth of the inter-pole slot 230 can be greater than the depth of the harmonic slot 210 to ensure the suppression effect on inter-pole leakage flux and avoid excessive influence on the main magnetic flux, thereby ensuring the efficiency and stability of the motor and reducing motor noise; alternatively, the depth of the inter-pole slot 230 can be made approximately the same as the depth of the harmonic slot 210, depending on the requirements of the motor. Here, d1, d2, and ds are in mm. Of course, in other embodiments, the magnitude relationship of A1, A2, ..., An can also be limited, such as the difference between A1, A2, ..., An being within ±2%, and the ratio of As to any one of A1, A2, ..., An being within... The value is between 1.005 and 1.005, so that the width of the interpole slot 230 can be made larger.

[0046] In one embodiment, please refer to Figure 1 , Figure 2 and Figure 5 The magnetic slots 220 are symmetrically arranged around the first diameter, and the inter-pole slots 230 and n harmonic slots 210 are symmetrically distributed around the first diameter. It can be understood that the symmetrical layout of the magnetic slots 220, inter-pole slots 230, and harmonic slots 210 in this embodiment ensures a high degree of consistency in the structure and magnetic circuit of each magnetic pole region, avoiding the air gap magnetic flux density eccentricity, magnetic reluctance imbalance, and resulting unilateral magnetic pull caused by the asymmetrical slotting of the rotor core 200. The symmetrically distributed harmonic slots 210 and inter-pole slots 230 not only make the harmonic modulation effect under each magnetic pole uniform and consistent, but also improve the sinusoidal nature of the back electromotive force waveform and the symmetry of the induced electromotive force of the three-phase windings; at the same time, the radial electromagnetic force distribution of the rotor at high speed is more balanced, improving operational stability and reliability. Specifically, during high-speed operation, this symmetrical layout can reduce the radial alternating electromagnetic force on the rotor, reduce vibration excitation sources, and improve operational stability. Of course, in other embodiments, the rotor core 200 also includes a second diameter passing through the center of the harmonic slot 210 in the circumferential direction and a third diameter passing through the center of the inter-pole slot 230 in the circumferential direction, with the harmonic slot 210 symmetrically arranged around the second diameter and the inter-pole slot 230 symmetrically arranged around the third diameter.

[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 A rotor core is mounted in the rotor hole. The rotor core includes a plurality of circumferentially spaced magnetic slots. Between two adjacent magnetic slots, an inter-pole slot is recessed on the outer circumference of the rotor core. The rotor core includes a first diameter passing through the center of the magnetic slots in the circumferential direction. From the inter-pole slot to the adjacent first diameter, n harmonic slots are also sequentially recessed on the outer circumference of the rotor core. The central angles formed by the n harmonic slots corresponding to the centers of the rotor core are A1, A2, ..., An, respectively. The central angle formed by the inter-pole slots corresponding to the centers of the rotor core is As. The number of poles of the motor is 2P, and n is greater than or equal to 1, satisfying: .

2. The motor as described in claim 1, characterized in that, n equals 2, and from the inter-pole slot to the adjacent first diameter, the two harmonic slots are respectively the first harmonic slot and the second harmonic slot, satisfying: .

3. The motor as described in claim 2, characterized in that, The outer peripheral wall of the rotor core includes a first outer wall between the first diameter and the adjacent second harmonic slot, and a second outer wall between the second harmonic slot and the adjacent first harmonic slot. The first outer wall, the second harmonic slot, and the second outer wall are connected sequentially, and the central angle formed by the first outer wall, the second harmonic slot, and the second outer wall corresponding to the center of the rotor core is a1, and the central angle formed by the first outer wall corresponding to the center of the rotor core is a2, satisfying: , and / or .

4. The motor as described in claim 2, characterized in that, The minimum distance from the bottom of the first harmonic slot to the center of the rotor core is d1, the minimum distance from the bottom of the second harmonic slot to the center of the rotor core is d2, and the minimum distance from the bottom of the inter-pole slot to the center of the rotor core is ds, 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 5, characterized in that, n equals 2, and from the inter-pole slot to the adjacent first diameter, the two harmonic slots are respectively the first harmonic slot and the second harmonic slot, satisfying: .

7. 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: 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... .

8. The motor as described in any one of claims 1 to 7, characterized in that, The magnet slots are symmetrically arranged around the first diameter, and the inter-pole slots and n harmonic slots are symmetrically distributed around 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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