Induction electric motor, compressor, and refrigeration device
By optimizing the design of the stator laminations and limiting the ratios of stator tooth width to slot width and stator yoke width to structural thickness, the problems of low efficiency and high heat generation in induction motors were solved, resulting in improved motor efficiency and reduced heat generation.
Patent Information
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- GUANGDONG MEIZHI COMPRESSOR
- Filing Date
- 2025-05-13
- Publication Date
- 2026-07-16
AI Technical Summary
In induction motor design, an improper width ratio between the stator yoke and stator teeth leads to problems such as low motor efficiency, high heat generation, and insufficient winding space.
By optimizing the design of the stator laminations, the ratio of stator tooth width to slot width is limited to 2.6≤W2/W1≤3.6, and the ratio of stator yoke width to structural thickness is limited to 0.3≤Y1/((L1-L3)/2)≤0.45. The area of the stator slots is rationally designed to balance winding losses and iron losses, thereby improving motor efficiency.
This achieves improved motor efficiency and reduced heat generation, ensures sufficient space in the stator windings, reduces iron losses and winding losses, and improves mechanical performance and output capacity.
Smart Images
Figure CN2025094637_16072026_PF_FP_ABST
Abstract
Description
Induction motors, compressors and refrigeration equipment
[0001] Related applications
[0002] This application claims priority to Chinese patent application No. 202510038709.9, filed on January 9, 2025, the entire contents of which are incorporated herein by reference. Technical Field
[0003] This application relates to the field of motor technology, and in particular to an induction motor, a compressor, and a refrigeration device. Background Technology
[0004] Induction motors are widely used in household appliances, industrial equipment, and office automation equipment, especially in air conditioner compressors. In the design of aluminum wire induction motors, the appropriate ratio of the stator yoke width, stator tooth width, and the area of each part of the stator and rotor cores are key parameters. If the stator yoke or stator teeth are too narrow, it will result in high magnetic reluctance, high magnetic flux density, high iron losses, low efficiency, and excessive heat generation. However, if the stator yoke or stator teeth are too wide, it will lead to insufficient space in the stator windings, allowing for the use of too small a diameter aluminum wire, resulting in low motor efficiency and excessive heat generation. Summary of the Invention
[0005] The main objective of this application is to provide an induction motor, compressor, and refrigeration equipment, which aims to solve at least one of the technical problems mentioned in the background art.
[0006] To achieve the above objectives, this application proposes an induction motor, which includes a stator component, a stator core, and a plurality of stator laminations stacked along its axial direction. Each stator lamination includes a stator yoke and a plurality of stator teeth disposed on the inner side of the stator yoke and spaced apart circumferentially thereon, with a stator slot formed between two adjacent stator teeth.
[0007] Wherein, the line segment passing through the center of the stator lamination intersects the outer contour of the stator lamination at any two points, and the maximum value of the line segment between any two intersection points is L1, and the minimum value is L2, satisfying:
[0008] 1.02≤L1 / L2≤1.2,
[0009] The stator tooth width is W1, and the maximum stator slot width is W2, satisfying the following:
[0010] 2.6 ≤ W2 / W1 ≤ 3.6
[0011] The minimum stator yoke width of the stator lamination is Y1, and the inner diameter of the stator lamination is L3, satisfying:
[0012] 0.3≤Y1 / ((L1-L3) / 2)≤0.45.
[0013] In one embodiment, L1 is the diameter of the outer circle of the stator lamination, which ranges from 60 mm to 200 mm; and / or, the diameter of L3 ranges from 30 mm to 100 mm.
[0014] In one embodiment, the number of stator slots is 16-32; and / or, the opening width of the stator slot is W5, satisfying 1.6 mm ≤ W5 ≤ 2.4 mm.
[0015] In one embodiment, the induction motor further includes a rotor component disposed inside the stator component. The rotor component includes a rotor core, and the rotor core includes a plurality of rotor laminations stacked along its axial direction. The rotor laminations are provided with a plurality of rotor slots spaced apart along their circumference, and there are rotor teeth between two adjacent rotor slots. The tooth width of the rotor teeth is W3, which satisfies: 3.4≤W2 / W3≤4.4.
[0016] In one embodiment, the maximum slot width of the rotor slot is W4, which satisfies: 2.5≤W2 / W4≤3.5.
[0017] In one embodiment, the rotor slot includes a first arc segment, a second arc segment, and a straight segment connecting the first arc segment and the second arc segment, wherein the first arc segment is disposed near the center of the rotor lamination.
[0018] In one embodiment, the second arc-shaped segment protrudes toward the outer peripheral surface of the rotor lamination, and the orientation of the first arc-shaped segment is opposite to that of the second arc-shaped segment.
[0019] In one embodiment, the rotor slot is disposed adjacent to the outer peripheral surface of the rotor lamination.
[0020] In one embodiment, the rotor slot is a closed slot that is enclosed on all four sides, and the minimum distance from the rotor slot to the outer peripheral surface of the rotor lamination is M1, which satisfies 0 mm < M1 ≤ 0.5 mm.
[0021] In one embodiment, the maximum width of the rotor slot ranges from 1.5 mm to 6 mm; and / or, the maximum width of the stator slot ranges from 3 mm to 20 mm.
[0022] In one embodiment, the rotor component further includes a plurality of aluminum or copper parts, which are respectively filled in a plurality of rotor slots.
[0023] In one embodiment, the outer contour of the stator lamination has at least one tangent edge, and at least one of any two intersection points between the line segment of the stator lamination passing through its center and the outer contour of the stator lamination is located on the tangent edge; or, the outer contour of the stator lamination has at least one curved segment, and at least one of any two intersection points between the line segment of the stator lamination passing through its center and the outer contour of the stator lamination is located on the curved segment.
[0024] This application also proposes a compressor, which includes the induction motor. The induction motor includes a stator component, the stator component includes a stator core, the stator core includes a plurality of stator laminations stacked along its axial direction, the stator laminations include a stator yoke and a plurality of stator teeth disposed inside the stator yoke and spaced apart circumferentially thereon, and a stator slot is formed between two adjacent stator teeth;
[0025] Wherein, the line segment passing through the center of the stator lamination intersects the outer contour of the stator lamination at any two points, and the maximum value of the line segment between any two intersection points is L1, and the minimum value is L2, satisfying:
[0026] 1.02≤L1 / L2≤1.2,
[0027] The stator tooth width is W1, and the maximum stator slot width is W2, satisfying the following:
[0028] 2.6 ≤ W2 / W1 ≤ 3.6
[0029] The minimum stator yoke width of the stator lamination is Y1, and the inner diameter of the stator lamination is L3, satisfying:
[0030] 0.3≤Y1 / ((L1-L3) / 2)≤0.45.
[0031] This application also proposes a refrigeration device, which includes a compressor, and the compressor includes the induction motor. The induction motor includes a stator component, which includes a stator core. The stator core includes a plurality of stator laminations stacked along its axial direction. Each stator lamination includes a stator yoke and a plurality of stator teeth disposed inside the stator yoke and spaced apart circumferentially thereon. A stator slot is formed between two adjacent stator teeth.
[0032] Wherein, the line segment passing through the center of the stator lamination intersects the outer contour of the stator lamination at any two points, and the maximum value of the line segment between any two intersection points is L1, and the minimum value is L2, satisfying:
[0033] 1.02≤L1 / L2≤1.2,
[0034] The stator tooth width is W1, and the maximum stator slot width is W2, satisfying the following:
[0035] 2.6 ≤ W2 / W1 ≤ 3.6
[0036] The minimum stator yoke width of the stator lamination is Y1, and the inner diameter of the stator lamination is L3, satisfying:
[0037] 0.3≤Y1 / ((L1-L3) / 2)≤0.45. Attached Figure Description
[0038] To more clearly illustrate the technical solutions in the embodiments of this application 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 this application. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.
[0039] Figure 1 is a schematic diagram of the structure of a stator lamination and rotor lamination of an induction motor provided in this application;
[0040] Figure 2 is a dimensioned diagram of the stator laminations and rotor laminations in Figure 1;
[0041] Figure 3 is a magnified view of part A in Figure 1.
[0042] Explanation of icon numbers:
[0043] 1. Stator core; 10. Stator laminations; 11. Stator yoke; 12. Stator teeth; 13. Stator slots;
[0044] 2. Rotor core; 20. Rotor laminations; 21. Rotor slots; 211. Straight section; 212. First arc section; 213. Second arc section; 22. Rotor teeth.
[0045] The realization of the purpose, functional features and advantages of this application will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Embodiments of the present invention
[0046] The technical solutions of the embodiments of this application 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 this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.
[0047] It should be noted that if the embodiments of this application 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.
[0048] Furthermore, if the embodiments of this application 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. Therefore, 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 that simultaneously satisfies A and B. 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 in this application.
[0049] Induction motors are widely used in household appliances, industrial equipment, and office automation equipment, especially in air conditioner compressors. In the design of aluminum wire induction motors, the appropriate ratio of the stator yoke width, stator tooth width, and the area of each part of the stator and rotor cores are key parameters. If the stator yoke or stator teeth are too narrow, it will result in high magnetic reluctance, high magnetic flux density, high iron losses, low efficiency, and excessive heat generation. However, if the stator yoke or stator teeth are too wide, it will lead to insufficient space in the stator windings, allowing for the use of too small a diameter aluminum wire, resulting in low motor efficiency and excessive heat generation.
[0050] This application proposes an induction motor for use in an air conditioning compressor, wherein the induction motor is a unidirectional induction motor.
[0051] Please refer to Figures 1 and 2. In one embodiment of this application, the induction motor includes a stator component, which includes a stator core 1. The stator core 1 includes a plurality of stator laminations 10 stacked along its axial direction. Each stator lamination 10 includes a stator yoke 11 and a plurality of stator teeth 12 disposed inside the stator yoke 11 and spaced apart circumferentially thereon. A stator slot 13 is formed between two adjacent stator teeth 12.
[0052] Among them, the line segment passing through the center of the stator lamination 10 intersects the outer contour of the stator lamination 10 at any two points, and the maximum value of the line segment between any two intersection points is L1, and the minimum value is L2, satisfying:
[0053] 1.02≤L1 / L2≤1.2,
[0054] The tooth width of stator tooth 12 is W1, and the maximum slot width of stator slot 13 is W2, satisfying:
[0055] 2.6 ≤ W2 / W1 ≤ 3.6
[0056] The minimum stator yoke 11 width of the stator lamination 10 is Y1, and the inner diameter of the stator lamination 10 is L3, satisfying:
[0057] 0.3≤Y1 / ((L1-L3) / 2)≤0.45.
[0058] Specifically, the line segment passing through the center of the stator lamination 10 intersects the outer contour of the stator lamination 10 at any two points. These intersection points can be any two points on the outer contour of the stator lamination 10, as long as the line connecting these two points passes through the center of the stator lamination 10. The maximum value of the line segment between any two intersection points is L1, and the minimum value is L2. That is, the outer contour of the stator lamination 10 is not a complete circle, but is composed of arc segments and non-arc segments. In this embodiment, the maximum value of the line segment between any two intersection points is L1, which can be understood as the diameter of the stator lamination 10. L2 is less than L1, and L2 corresponds to at least one of the intersection points of any two intersection points of the stator lamination 10, located at a point on the non-circular outline of the outer contour of the stator lamination 10. This ensures that L2 is less than L1.
[0059] Further, it can be understood that the outer contour of the stator lamination 10 has a recessed structure, which is composed of arcs, curves, or straight lines different from the outer contour of the stator lamination 10. Specifically, L1 / L2 satisfies 1.02 ≤ L1 / L2 ≤ 1.2, meaning the outer contour of the stator lamination 10 is not a complete circle. The recessed structure of the outer contour of the stator lamination 10 is used to allow refrigerant to flow, ensuring effective heat dissipation for the motor. Limiting the ratio of L1 to L2 within a reasonable range is crucial. On the one hand, if the area of the recessed structure is too small, heat dissipation will be insufficient; on the other hand, if the area of the recessed structure is too large, it will occupy too much space in the stator yoke 11, leading to oversaturation of the magnetic density in the stator yoke 11 and reduced motor efficiency. Therefore, the ratio of L1 to L2 is limited to the range of 1.02-1.2. The ratio of L1 to L2 can be 1.02, 1.04, 1.06, 1.08, 1.1, 1.12, 1.14, 1.16, 1.18, or 1.2, or other ratios, which will not be elaborated further.
[0060] The stator tooth 12 has a tooth width of W1, and the maximum slot width of the stator slot 13 is W2. The ratio of stator slot 13 to stator tooth 12 satisfies 2.6 ≤ W2 / W1 ≤ 3.6. The tooth width of stator tooth 12 affects the magnetic flux density. Since the winding is wound in stator slot 13, the slot width of stator slot 13 affects the cross-sectional area of the conductor. If the slot width of stator slot 13 is too small, the cross-sectional area of the conductor wound in stator slot 13 will be small, resulting in high resistance and high winding loss, thus lower motor efficiency. If the slot width of stator slot 13 is too large, with the overall size of stator lamination 10 and the number of stator slots 13 remaining unchanged, the tooth width of stator tooth 12 will become smaller, leading to a larger magnetic flux density through stator tooth 12, higher iron loss, and lower motor efficiency. Therefore, the design of the slot width of stator slot 13 and the tooth width of stator tooth 12 needs to balance winding losses and iron losses to achieve a high level of motor efficiency. Thus, the ratio of stator slot 13 to stator tooth 12, i.e., W2 / W1, is limited to between 2.6 and 3.6 to ensure high motor efficiency. Examples of the ratio of stator slot 13 to stator tooth 12, i.e., W2 / W1, can be 2.6, 2.8, 3.0, 3.2, 3.4, or 3.6, but other ratios are also possible and will not be elaborated upon further.
[0061] More specifically, the induction motor is a unidirectional induction motor, wherein D1=100mm; D2=97mm; W1=3.25mm; W2=8.5mm; W3=2.6mm; W4=3mm; Y1=11mm; Y2=9.5mm. Under the aforementioned dimensional conditions, the measured data on the impact of W2 / W1 on the efficiency and heat generation of the induction motor are as follows:
[0062] Table 1. Effects of W2 / W1 on the efficiency and heat generation of induction motors
[0063]
[0064] Therefore, it can be seen that when the ratio of W1 / W2 is in the range of 2.6-3.6, the induction motor has higher efficiency and lower heat generation.
[0065] The width of the minimum stator yoke 11 of the stator lamination 10 is Y1, and the inner diameter of the stator lamination 10 is L3, satisfying 0.3≤Y1 / ((L1-L3) / 2)≤0.45. Here, L1 is the maximum value of the line segment between any two intersection points, i.e., the diameter of the stator lamination 10; L3 is the inner diameter of the stator lamination 10; and (L1-L3) / 2 refers to the structural thickness of the stator lamination 10 (specifically, the radial thickness of the stator lamination 10), i.e., the sum of the thickness of the stator yoke 11 and the height of the stator slot 13. The width of the minimum stator yoke 11 of the stator lamination 10 is Y1. By limiting the range of the ratio between the minimum stator yoke 11 width and the structural thickness of the stator lamination 10, on the one hand, if the stator yoke 11 width Y1 is too small, the magnetic field line density of the stator yoke 11 will be oversaturated, resulting in higher iron losses and reduced motor efficiency. On the other hand, if the stator yoke 11 width Y1 is too large, the slot height of the stator slot 13 will be smaller, the cross-sectional area of the stator slot 13 will be smaller, the cross-sectional area of the wires wound in the stator slot 13 will be smaller, resulting in higher resistance, higher winding losses, higher iron losses, and lower motor efficiency. Therefore, the ratio between the minimum stator yoke 11 width and the structural thickness of the stator lamination 10, i.e., Y1 / ((L1-L3) / 2), is limited to between 0.3 and 0.45 to ensure that the motor has higher efficiency. The ratio of Y1 / ((L1-L3) / 2) can be 0.3, 0.35, 0.4, or 0.45, or other ratios, which will not be elaborated further.
[0066] Regarding the heat generation of induction motors, the main sources of heat generation are winding heat and core heat. For winding heat generation, increasing the slot area of stator slot 13 increases the cross-sectional area of the windings wound within it. A larger cross-sectional area reduces resistance, thus decreasing heat generation. Therefore, by limiting the maximum slot width and height of stator slot 13 and rationally designing its area to maximize it within a reasonable range, the stator slot 13 can accommodate a sufficient amount of stator windings, ensuring adequate material usage for the stator laminations 10 and guaranteeing the flow of magnetic flux within the stator core 1, reducing iron losses. Furthermore, it can reduce the heat generation of the induction motor, thereby mitigating efficiency reduction and shortened lifespan caused by overheating.
[0067] Referring to FIG. 2, in one embodiment, L1 is the diameter of the outer circle of the stator punching 10, and the diameter range is 60 mm to 200 mm; and / or, the diameter range of L3 is 30 mm to 100 mm. Specifically, the outer circle diameter of the stator punching 10 can be, for example, 60 mm, 70 mm, 80 mm, 90 mm, 100 mm, 110 mm, 120 mm, 130 mm, 140 mm, 150 mm, 160 mm, 170 mm, 180 mm, 190 mm, 200 mm. The diameter of the inner circle of the stator punching 10, that is, the inner diameter of the stator punching 10 can be, for example, 30 mm, 40 mm, 50 mm, 60 mm, 70 mm, 80 mm, 90 mm, 100 mm.
[0068] Referring to FIG. 2, in one embodiment, the number of slots of the stator slot 13 is 16 - 32; and / or, the opening width of the stator slot 13 is W5, satisfying 1.6 mm ≤ W5 ≤ 2.4 mm. Specifically, the number of slots of the stator slot 13 can be, for example, 16, 20, 24, 28, 32. The opening width of the stator slot 13 can be, for example, 1.6 mm, 1.8 mm, 2 mm, 2.2 mm, 2.4 mm. Exemplarily, the opening width of the stator slot 13 is 2.2 mm. This can not only reduce the amplitude of the excited high-order harmonics, further reduce the loss of the induction motor and improve the efficiency of the induction motor, but also ensure the convenience of winding the stator winding.
[0069] Referring to FIGS. 1 and 2, in one embodiment, the induction motor further includes a rotor component. The rotor component is disposed inside the stator component. The rotor component includes a rotor core 2. The rotor core 2 includes a plurality of rotor punchings 20 stacked along its axial direction. The rotor punchings 20 are provided with a plurality of rotor slots 21 spaced circumferentially along it. Between two adjacent rotor slots 21 is a rotor tooth 22; the maximum slot width of the stator slot 13 is W2, and the tooth width of the rotor tooth 22 is W3, satisfying: 3.4 ≤ W2 / W3 ≤ 4.4.
[0070] Specifically, W2 / W3 is the ratio of the maximum slot width of the stator slot 13 to the tooth width of the rotor tooth 22. Limiting the ratio of W2 / W3 between 3.4 - 4.4 can improve the efficiency of the induction motor and reduce the heat generation. Among them, the ratio of the maximum slot width of the stator slot 13 to the tooth width of the rotor tooth 22 can be, for example, 3.4, 3.6, 3.8, 4, 4.2, 4.4.
[0071] Furthermore, the maximum slot width of rotor slot 21 is W4, satisfying: 2.5 ≤ W2 / W4 ≤ 3.5. Specifically, W2 / W4 is the ratio of the maximum slot width of stator slot 13 to the maximum slot width of rotor slot 21. Limiting the ratio of W2 / W4 to between 3.4 and 4.4 can improve the efficiency of the induction motor and reduce heat generation. The ratio of the maximum slot width of stator slot 13 to the maximum slot width of rotor slot 21 can, for example, be 2.5, 2.6, 2.7, 2.8, 2.9, 3.0, 3.1, 3.2, 3.3, 3.4, or 3.5.
[0072] Referring to Figure 3, in one embodiment, the rotor slot 21 includes a first arc-shaped segment 212, a second arc-shaped segment 213, and a straight segment 211 connecting the first arc-shaped segment 212 and the second arc-shaped segment 213. The first arc-shaped segment 212 is located near the center of the rotor lamination 20. Specifically, the rotor slot 21 is approximately pear-shaped. The first arc-shaped segment 212 is located near the center of the rotor lamination 20, and the second arc-shaped segment 213 is located near the outer circumference of the rotor lamination 20. In this embodiment, the overall shape of the first arc-shaped segment 212 and the second arc-shaped segment 213 is semi-circular. The diameter of the first arc-shaped segment 212 is smaller than the diameter of the second arc-shaped segment 213; that is, the first arc-shaped segment 212 is a small semicircle, and the second arc-shaped segment 213 is a large semicircle. Of course, in other embodiments, the first arc-shaped segment 212 and the second arc-shaped segment 213 can also be multiple arc segments or other arc shapes. This configuration allows for efficient use of the circumferential area of the rotor lamination 20, maximizing the utilization of the rotor slot 21 area. Specifically, the second arc-shaped segment 213 protrudes towards the outer circumferential surface of the rotor lamination 20, and the orientation of the first arc-shaped segment 212 is opposite to that of the second arc-shaped segment 213.
[0073] Referring to Figures 1 to 3, in one embodiment, the rotor slot 21 is disposed adjacent to the outer peripheral surface of the rotor lamination 20. Exemplarily, the rotor slot 21 is a closed slot that is closed on all four sides, and the minimum distance from the rotor slot 21 to the outer peripheral surface of the rotor lamination 20 is M1, which satisfies 0 mm < M1 ≤ 0.5 mm.
[0074] Specifically, the rotor slot 21 needs to be filled with non-magnetic conductive materials (usually aluminum or copper), and it is formed by pressing liquid aluminum or copper into the rotor slot 21, i.e., die casting. During the die casting process, in order to prevent the leakage of liquid aluminum or copper, the rotor slot 21 is designed with a pear-shaped closed slot, which facilitates the flow of liquid aluminum or copper and avoids the formation of pores.
[0075] Furthermore, the magnetic field formed by the secondary current induced in the aluminum or copper material does not interact with the magnetic field formed by the current flowing through the stator winding. Instead, it leaks through the "bridge" between the rotor slot 21 and the outer peripheral surface of the rotor core 2. By limiting the minimum distance between the rotor slot 21 and the outer peripheral surface of the rotor core 2 in the radial direction of the rotor core 2 to less than or equal to 0.5 mm, the maximum output capacity that the induction motor can achieve can be guaranteed, and the weakening of the mechanical performance of the induction motor can be reduced.
[0076] Meanwhile, the rotor core 2 and the stator core 1 are made of magnetically conductive steel plates stacked together. By limiting the minimum distance between the rotor slot 21 and the outer circumferential surface of the rotor core 2 in the radial direction of the rotor core 2 to be greater than 0 mm, the requirements for manufacturing process can be reduced, thereby reducing production costs.
[0077] Referring to Figures 1 and 2, in one embodiment, the maximum slot width of the rotor slot 21 ranges from 1.5 mm to 6 mm; and / or, the maximum slot width of the stator slot 13 ranges from 3 mm to 20 mm. Specifically, if the rotor slot 21 is too narrow, it is inconvenient to process and stamp, and the effect of die-casting aluminum or copper is not good. If the rotor slot 21 is too wide, it will affect the tooth width of the rotor teeth 22, resulting in excessively high magnetic flux density of the rotor teeth 22 and low efficiency of the induction motor. Therefore, the maximum slot width range of the rotor slot 21 is limited to 1.5 mm to 6 mm. The maximum slot width of the rotor slot 21 can be exemplarily 1.5 mm, 2 mm, 2.5 mm, 3 mm, 3.5 mm, 4 mm, 4.5 mm, 5 mm, 5.5 mm, or 6 mm. Similarly, if the slot width of the stator slot 13 is too narrow, on the one hand, it is inconvenient to install the windings, and on the other hand, the cross-sectional area of the windings is affected by the slot width of the stator slot 13, which will affect the motor efficiency. On the other hand, if the stator slot 13 is too wide, it will affect the reduction of the stator tooth 12 width, which may easily lead to oversaturation of the magnetic field lines of the stator tooth 12, reducing motor efficiency. Furthermore, an excessively narrow stator tooth 12 will affect the structural strength of the stator lamination 10, making the stator tooth 12 prone to deformation or even breakage. Therefore, the maximum slot width of the stator slot 13 is limited to between 3 mm and 20 mm. The maximum slot width of the stator slot 13 can be exemplarily 3 mm, 5 mm, 8 mm, 10 mm, 12 mm, 15 mm, 18 mm, or 20 mm.
[0078] In one embodiment, the rotor component further includes multiple aluminum or copper components (not shown in the figure), which are respectively filled in multiple rotor slots 21. Specifically, when an appropriate single-phase current is applied to the stator winding, a secondary current can be induced in the aluminum or copper components. The magnetic field formed by the secondary current interacts with the magnetic field formed by the current applied to the stator winding, thereby driving the rotor core 2 to rotate.
[0079] Referring to Figures 1 and 2, in one embodiment, the outer contour of the stator lamination 10 has at least one tangent edge, and at least one of any two intersection points between the line segment of the stator lamination 10 passing through its center and the outer contour of the stator lamination 10 is located on the tangent edge; or, the outer contour of the stator lamination 10 has at least one curved segment, and at least one of any two intersection points between the line segment of the stator lamination 10 passing through its center and the outer contour of the stator lamination 10 is located on the curved segment.
[0080] Specifically, as described above, the outer contour of the stator lamination 10 has a recessed structure, which is formed by at least one tangent edge on the outer contour of the stator lamination 10. In this case, at least one of any two intersection points between the line segment passing through the center of the stator lamination 10 and the outer contour of the stator lamination 10 lies on the tangent edge, and the line connecting the two intersection points is L2. Alternatively, the recessed structure is formed by at least one curved segment on the outer contour of the stator lamination 10. In this case, at least one of any two intersection points between the line segment passing through the center of the stator lamination 10 and the outer contour of the stator lamination 10 lies on the curved segment, and the line connecting the two intersection points is L2. The curved segment can be an irregular curve, i.e., composed of multiple curved segments, or it can be composed of an arc with a different curvature than the full circular outer contour line of the stator lamination 10.
[0081] The technical solution of this application, by limiting the maximum slot width and slot height of the stator slot 13, rationally designs the area of the stator slot 13, ensuring that the area of the stator slot 13 is maximized within a reasonable range. On the one hand, this allows the stator slot 13 to accommodate a sufficient amount of stator windings, ensuring the material usage of the stator laminations 10, ensuring the flow of magnetic flux in the induction motor on the stator core 1, and reducing iron loss. On the other hand, it can also reduce the heat generation of the induction motor, thereby reducing the efficiency reduction and lifespan shortening caused by overheating of the induction motor.
[0082] This application also proposes a compressor that includes an induction motor. The specific structure of the induction 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.
[0083] This application also proposes a refrigeration device, which includes a compressor and an induction motor. The specific structure of the induction motor is as described in the above embodiments. Since this refrigeration device adopts all the technical solutions of all the above embodiments, it possesses at least all the beneficial effects brought about by the technical solutions of the above embodiments, and will not be elaborated further here.
[0084] The above description is merely an exemplary embodiment of this application and does not limit the patent scope of this application. Any equivalent structural transformations made based on the technical concept of this application and the contents of the specification and drawings of this application, or direct / indirect applications in other related technical fields, are included within the patent protection scope of this application.
Claims
1. An induction motor, wherein, The induction motor includes: A stator component includes a stator core, the stator core including a plurality of stator laminations stacked along its axial direction, the stator laminations including a stator yoke and a plurality of stator teeth disposed on the inner side of the stator yoke and spaced apart circumferentially thereon, and a stator slot is formed between two adjacent stator teeth; Wherein, the line segment passing through the center of the stator lamination intersects the outer contour of the stator lamination at any two points, the maximum value of the line segment between any two intersection points is L1, the minimum value is L2, satisfying: 1.02≤L1 / L2≤1.2, the tooth width of the stator tooth is W1, the maximum slot width of the stator groove is W2, satisfying: 2.6≤W2 / W1≤3.6, the minimum stator yoke width of the stator lamination is Y1, and the inner diameter of the stator lamination is L3, satisfying: 0.3≤Y1 / ((L1-L3) / 2)≤0.
45.
2. The induction motor as described in claim 1, wherein, L1 is the diameter of the outer circle of the stator lamination, which ranges from 60 mm to 200 mm; and / or, the diameter of L3 ranges from 30 mm to 100 mm.
3. The induction motor as described in claim 1 or 2, wherein, The number of stator slots is 16-32; and / or the opening width of the stator slot is W5, satisfying 1.6 mm ≤ W5 ≤ 2.4 mm.
4. The induction motor as described in any one of claims 1 to 3, wherein, The induction motor further includes a rotor component, which is disposed inside the stator component. The rotor component includes a rotor core, which includes a plurality of rotor laminations stacked along its axial direction. The rotor laminations are provided with a plurality of rotor slots spaced apart along their circumference, and there are rotor teeth between two adjacent rotor slots. The tooth width of the rotor teeth is W3, which satisfies: 3.4≤W2 / W3≤4.
4.
5. The induction motor as described in claim 4, wherein, The maximum slot width of the rotor slot is W4, which satisfies: 2.5≤W2 / W4≤3.
5.
6. The induction motor as described in claim 4 or 5, wherein, The rotor slot includes a first arc segment, a second arc segment, and a straight segment connecting the first arc segment and the second arc segment, wherein the first arc segment is located close to the center of the rotor lamination.
7. The induction motor as described in claim 6, wherein, The second arc-shaped segment protrudes toward the outer peripheral surface of the rotor lamination, and the orientation of the first arc-shaped segment is opposite to that of the second arc-shaped segment.
8. The induction motor as described in any one of claims 4 to 7, wherein, The rotor slot is located adjacent to the outer peripheral surface of the rotor lamination.
9. The induction motor as claimed in claim 8, wherein, The rotor slot is a closed slot with all four sides closed. The minimum distance from the rotor slot to the outer peripheral surface of the rotor lamination is M1, which satisfies 0 mm < M1 ≤ 0.5 mm.
10. The induction motor according to any one of claims 4 to 9, wherein, The maximum width of the rotor slot is 1.5 mm to 6 mm; and / or the maximum width of the stator slot is 3 mm to 20 mm.
11. The induction motor as claimed in any one of claims 4 to 10, wherein, The rotor component also includes multiple aluminum or copper parts, which are respectively filled in multiple rotor slots.
12. The induction motor as claimed in any one of claims 1 to 11, wherein, The outer contour of the stator lamination has at least one tangent edge, and at least one of any two intersection points between the line segment of the stator lamination passing through its center and the outer contour of the stator lamination is located on the tangent edge; or, the outer contour of the stator lamination has at least one curved segment, and at least one of any two intersection points between the line segment of the stator lamination passing through its center and the outer contour of the stator lamination is located on the curved segment.
13. A compressor, wherein, The compressor includes an induction motor as described in any one of claims 1 to 12.
14. A refrigeration device, wherein, The refrigeration equipment includes the compressor as described in claim 13.