Induction motor, compressor and refrigeration equipment

Abstract

The invention discloses an induction motor, a compressor and refrigeration equipment, and relates to the technical field of motors, the induction motor comprises a stator component and a rotor component; the stator component comprises a stator core, the stator core comprises a stator punching sheet, the stator punching sheet comprises a stator yoke and a plurality of stator teeth which are arranged on the inner side of the stator yoke and are arranged at intervals in the circumferential direction of the stator yoke, and every two adjacent stator teeth form a stator groove; the rotor component is arranged on the inner side of the stator component, the rotor component comprises a rotor core, the rotor core comprises a rotor punching sheet, and the rotor punching sheet is provided with a plurality of rotor grooves which are arranged at intervals along the circumferential direction of the rotor punching sheet; wherein the groove height of the rotor groove is # imgabs 0 #, the radius of the rotor punching sheet is # imgabs 1 #, and the groove height of the stator groove is # imgabs 2 #; the thickness of the stator yoke is # imgabs 3 #, and the distance from the bottom of the rotor slot to the center of the inner circle of the rotor punching sheet is # imgabs 4 #; and the formula is as follows: 1.65 # imgabs 5 # 3.3. According to the induction motor, the efficiency of the induction motor can be improved.

Description

Technical Field

[0001] The present invention relates to the technical field of motors, and in particular to an induction motor, a compressor and a refrigeration device. Background Art

[0002] Induction motors are widely used in household appliances, industrial equipment, and office automation equipment, especially in air-conditioning compressors. The design of aluminum wire induction motors has some problems in practical applications. First, due to the large resistance of aluminum wire, induction motors using aluminum wire windings will produce large losses during operation, reducing the efficiency of the induction motor. Secondly, the existing rotor punching design is not optimized enough, resulting in a small volume and large resistance of the rotor aluminum bars, which further increases the loss of the induction motor. These problems limit the improvement of the efficiency of the induction motor, which in turn affects the energy efficiency of the compressor using it. Therefore, how to improve the efficiency of the induction motor and reduce the loss of the induction motor is an important issue facing current technology. Summary of the invention

[0003] The main purpose of the present invention is to provide an induction motor, a compressor and a refrigeration device, aiming to improve the efficiency of the induction motor.

[0004] To achieve the above-mentioned object, the present invention provides an induction motor, which comprises a stator component and a rotor component; the stator component comprises a stator core, the stator core comprises a plurality of stator punchings stacked along its axial direction, the stator punchings comprise a stator yoke and a plurality of stator teeth arranged inside the stator yoke and spaced apart along its circumferential direction, two adjacent stator teeth form a stator slot, and a stator winding is wound inside the stator slot; the rotor component is arranged inside the stator component, the rotor component comprises a rotor core, the rotor core comprises a plurality of rotor punchings stacked along its axial direction, and the rotor punchings are provided with a plurality of rotor slots spaced apart along its circumferential direction; Wherein, the slot height of the rotor slot is , the radius of the rotor punching is , the slot height of the stator slot is ; The thickness of the stator yoke is The distance from the bottom of the rotor slot to the inner center of the rotor punching is ; Satisfied: 1.65 3.3.

[0005] In one embodiment, the relationship between the slot height of the rotor slot and the distance from the slot bottom of the rotor slot to the inner circle center of the rotor punching sheet satisfies: 0.52≤(D7-D5) / D5≤1.

[0006] In one embodiment, there is a rotor tooth between two adjacent rotor slots, the tooth width of the rotor tooth is L2, the number of the rotor slots is Q2, and .

[0007] In one embodiment, the number of the stator slots is Q1, the tooth width of the stator teeth is L1, the radius of the bottom corner of the stator slot is R1, the maximum distance between any two stator slots passing through the center of the stator punching is D6, the maximum distance between any two rotor slots passing through the center of the rotor punching is D7, and the maximum slot width range of the rotor slot satisfies ; and / or, the maximum slot width range of the stator slot satisfies .

[0008] In one embodiment, the number of the rotor slots is 26 or 30.

[0009] In one embodiment, the rotor slot is disposed adjacent to an outer circumferential surface of the rotor sheet.

[0010] In one embodiment, the rotor slot is a closed slot that is closed on all sides, and the minimum distance from the rotor slot to the outer peripheral surface of the rotor punching is M1, which satisfies 0 mm <M1≤0.5 mm.

[0011] In one embodiment, the rotor slot includes an isosceles trapezoidal portion, a small semicircular portion and a large semicircular portion that are connected, the diameter of the small semicircular portion is consistent with the length of the short base of the isosceles trapezoid, and the straight side of the large semicircular portion is consistent with the length of the long base of the isosceles trapezoidal portion. In one embodiment, the large semicircular portion protrudes toward the outer circumferential surface of the rotor punching sheet, and the small semicircular portion protrudes toward the inner circumferential surface of the rotor core.

[0012] In one embodiment, the width of the rotor slot gradually decreases in a direction from the outer circumference of the rotor punching to the center of the rotor punching.

[0013] In one embodiment, the rotor component further includes a plurality of aluminum pieces or copper pieces, and the plurality of aluminum pieces or copper pieces are respectively filled in the plurality of rotor slots.

[0014] The present invention also proposes a compressor, which includes the induction motor. The induction motor includes a stator component and a rotor component; the stator component includes a stator core, the stator core includes a plurality of stator punchings stacked along its axial direction, the stator punchings include a stator yoke and a plurality of stator teeth arranged inside the stator yoke and spaced along its circumferential direction, two adjacent stator teeth form a stator slot, and a stator winding is wound in the stator slot; the rotor component is arranged inside the stator component, the rotor component includes a rotor core, the rotor core includes a plurality of rotor punchings stacked along its axial direction, and the rotor punchings are provided with a plurality of rotor slots spaced along its circumferential direction; Wherein, the slot height of the rotor slot is , the radius of the rotor punching is , the slot height of the stator slot is ; The thickness of the stator yoke is The distance from the bottom of the rotor slot to the inner center of the rotor punching is ; Satisfied: 1.65 3.3.

[0015] The present invention also proposes a refrigeration device, the refrigeration device includes a compressor, and the compressor includes the induction motor. The induction motor includes a stator component and a rotor component; the stator component includes a stator core, the stator core includes a plurality of stator punchings stacked along its axial direction, the stator punchings include a stator yoke and a plurality of stator teeth arranged inside the stator yoke and spaced along its circumferential direction, two adjacent stator teeth form a stator slot, and a stator winding is wound in the stator slot; the rotor component is arranged inside the stator component, the rotor component includes a rotor core, the rotor core includes a plurality of rotor punchings stacked along its axial direction, and the rotor punchings are provided with a plurality of rotor slots spaced along its circumferential direction; Wherein, the slot height of the rotor slot is , the radius of the rotor punching is , the slot height of the stator slot is ; The thickness of the stator yoke is The distance from the bottom of the rotor slot to the inner center of the rotor punching is ; Satisfied: 1.65 3.3.

[0016] The technical solution of the present invention can maximize the area of ​​the rotor slot within a reasonable range by limiting the ratio between the stator slot and the rotor slot, increase the cross-sectional area of ​​the aluminum material in the rotor slot, and reduce the resistance of the aluminum material, thereby further reducing the aluminum loss of the rotor core, reducing the heat generated by the rotor core, and improving the efficiency of the induction motor. Specifically, the slot height of the rotor slot is , the radius of the rotor punching is , the slot height of the stator slot is ; The thickness of the stator yoke is , the distance from the bottom of the rotor slot to the inner center of the rotor punching is ; Satisfied: 1.65 3.3. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0018] Figure 1 A schematic structural diagram of an embodiment of a stator punching sheet and a rotor punching sheet of an induction motor provided by the present invention; Figure 2 for Figure 1 Dimensional drawings of stator punchings and rotor punchings; Figure 3 for Figure 2 A partial enlarged view of the middle A; Figure 4 Comparison of induction motor efficiency before and after increasing the rotor slot area.

[0019] Description of Figure Numbers: 1. stator core; 10. stator punching; 11. stator yoke; 12. stator teeth; 13. stator slots; 2. rotor core; 20. rotor punching; 21. rotor slot; 211. isosceles trapezoidal portion; 212. large semicircular portion; 213. small semicircular portion; 22. rotor teeth; 23. rotor slot outer contour circle; 24. rotor slot inner contour circle.

[0020] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0022] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0023] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features limited to "first" and "second" may explicitly or implicitly include at least one of the features. In addition, if "and / or" or "and / or" appears in the full text, its meaning includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or solutions that satisfy both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0024] Induction motors are widely used in household appliances, industrial equipment, and office automation equipment, especially in air-conditioning compressors. The design of aluminum wire induction motors has some problems in practical applications. First, due to the large resistance of aluminum wire, induction motors using aluminum wire windings will produce large losses during operation, reducing the efficiency of the induction motor. Secondly, the existing rotor punching design is not optimized enough, resulting in a small volume and large resistance of the rotor aluminum bars, which further increases the loss of the induction motor. These problems limit the improvement of the efficiency of the induction motor, which in turn affects the energy efficiency of the compressor using it. Therefore, how to improve the efficiency of the induction motor and reduce the loss of the induction motor is an important issue facing current technology.

[0025] The present invention provides an induction motor used in an air-conditioning compressor. The induction motor is a unidirectional induction motor.

[0026] See also Figures 1 to 4 In one embodiment of the present invention, the induction motor includes a stator component and a rotor component; the stator component includes a stator core 1, the stator core 1 includes a plurality of stator punchings 10 stacked along its axial direction, the stator punchings 10 include a stator yoke 11 and a plurality of stator teeth 12 arranged inside the stator yoke 11 and spaced apart along its circumferential direction, two adjacent stator teeth 12 form a stator slot 13, and a stator winding is wound inside the stator slot 13; the rotor component is arranged 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, and the rotor punchings 20 are provided with a plurality of rotor slots 21 spaced apart along its circumferential direction; The slot height of the rotor slot 21 is (D7-D5) / 2, the radius of the rotor punching 20 is D3 / 2, and the slot height of the stator slot 13 is (D6-D2) / 2; the thickness of the stator yoke 11 is (D1-D6) / 2, and the distance from the slot bottom of the rotor slot 21 to the inner circle center of the rotor punching 20 is D5 / 2; Satisfied: 1.65 3.3.

[0027] Specifically, the plurality of rotor slots 21 are arranged at intervals along the circumference of the rotor sheet 20, and the plurality of rotor slots 21 have the same shape and size, and any rotor slot 21 has a closest point to the outer contour of the rotor sheet 20, and the connecting line between the closest points of the plurality of rotor slots 21 forms a rotor slot outer contour circle 23 (see Figure 3 ), D7 is the diameter of the rotor slot outer contour circle 23. Similarly, any rotor slot 21 has a point closest to the center of the rotor punching 20, and the connecting line between the points closest to the center of the rotor punching 20 of multiple rotor slots 21 forms a rotor slot inner contour circle 24 (see Figure 3 ), D5 is the diameter of the inner contour circle 24 of the rotor slot. Since multiple rotor slots 21 are arranged at intervals along the circumference of the rotor punching 20, (D7-D5) / 2 is the slot height of a single rotor slot 21. The diameter of the rotor punching 20 is D3, so the radius of the rotor punching 20 is D3 / 2. The rotor punching 20 has a rotor hole, which is used for the rotating shaft of the induction motor to pass through, and the diameter of the rotor hole is D4.

[0028] A plurality of stator slots 13 are arranged at intervals along the circumference of the stator sheet 10, wherein any stator slot 13 has the closest point to the outer contour of the stator sheet 10, and the line connecting the closest points of the plurality of stator slots 13 forms an outer contour circle of the stator slot 13, and D6 is the diameter of the outer contour circle 23 of the rotor slot. It should be noted that if the length of the line connecting the closest point of at least some of the plurality of stator slots 13 to the outer contour of the stator sheet 10 is different from the length of the line connecting the closest point of the other stator slots 13 to the outer contour of the stator sheet 10, then the outer contour circle of the stator slot 13 formed by the line connecting the closest points of the plurality of stator slots 13 refers to the outer contour circle of the stator slot 13 close to the outer contour of the stator sheet 10. Similarly, since the center of the stator core 1 is through-set to accommodate the rotor core 2, and the stator slot 13 on the stator sheet 10 is an open slot, the opening of which is set toward the center of the stator sheet 10. D2 refers to the inner diameter of the stator sheet 10 , and the stator slots 13 are arranged at intervals along the circumferential direction of the stator sheet 10 , so the slot height of the stator slots 13 is (D6-D2) / 2.

[0029] D1 refers to the diameter of the stator punching sheet 10, and the thickness of the stator yoke 11 is (D1-D6) / 2. Since D5 refers to the diameter of the inner contour circle 24 of the rotor slot, the distance from the bottom of the rotor slot 21 to the inner circle center of the rotor punching sheet 20 is D5 / 2.

[0030] ((D7-D5) / 2) / (D5 / 2), i.e. (D7-D5) / D5, refers to the ratio of the slot height of a single rotor slot 21 to the distance from the slot bottom of the rotor slot 21 to the inner circle center of the rotor punching 20 .

[0031] ((D6-D2) / 2) / ((D1-D6) / 2), ie, (D6-D2) / (D1-D6), refers to the ratio between the slot height of the stator slot 13 and the thickness of the stator yoke 11 .

[0032] The product of the above two is , Meets 1.65 3.3.

[0033] It should be noted that the tooth width of the stator tooth 12 affects the density of magnetic flux lines. Since the winding is wound in the stator slot 13, the slot width of the stator slot 13 affects the cross-sectional area of ​​the wire. If the slot width of the stator slot 13 is too small, the cross-sectional area of ​​the wire wound in the stator slot 13 is small, the resistance is large, and the winding loss is high, so the motor efficiency is low; if the slot width of the stator slot 13 is too large, the tooth width of the stator tooth 12 will become smaller when the overall size of the stator punching sheet 10 and the number of stator slots 13 remain unchanged, which will cause the density of magnetic flux lines passing through the stator tooth 12 to increase, the iron loss to increase, and the motor efficiency to decrease. Therefore, the slot width of the stator slot 13 and the tooth width of the stator tooth 12 need to balance the winding loss and iron loss, so that the motor efficiency is at a higher level.

[0034] At the same time, regarding the thickness of the stator yoke 11, on the one hand, if the thickness of the stator yoke 11 is too small, the magnetic flux density of the stator yoke 11 will be oversaturated, thereby causing the iron loss to increase and the motor efficiency to decrease; on the other hand, if the thickness of the stator yoke 11 is too large, the slot height of the stator slot 13 will become smaller, the cross-sectional area of ​​the stator slot 13 will become smaller, and the cross-sectional area of ​​the wire wound in the stator slot 13 will be smaller, resulting in a large resistance, high winding loss, high iron loss, and low motor efficiency.

[0035] Furthermore, for the heating of the induction motor, the heating sources of the induction motor are mainly the heating of the winding and the heating of the core. Among them, for the heating of the winding, if the slot area of ​​the stator slot 13 is increased, the cross-sectional area of ​​the winding wound in the stator slot 13 can be increased. If the cross-sectional area of ​​the winding increases, the resistance will decrease, and the heating value of the winding will decrease. Therefore, by limiting the maximum slot width and slot height of the stator slot 13, the area of ​​the stator slot 13 is reasonably designed to ensure that the area of ​​the stator slot 13 is maximized within a reasonable range. On the one hand, the stator slot 13 can accommodate enough stator windings, ensure the material usage of the stator punching sheet 10, ensure the flow of magnetic flux in the induction motor on the stator core 1, and reduce iron loss. On the other hand, the heating value of the induction motor can also be reduced, thereby reducing the efficiency reduction and shortened life caused by overheating of the induction motor.

[0036] See also Figure 4 , for the rotor slot 21 of the induction motor, if the area of ​​the rotor slot 21 is increased alone, the starting of the induction motor will be worse. The present invention adjusts the relationship between the stator slot 13 and the rotor slot 21 so that the product of the ratio of the slot height of a single rotor slot 21 to the distance from the slot bottom of the rotor slot 21 to the inner circle center of the rotor punching 20 and the ratio of the slot height of the stator slot 13 to the thickness of the stator yoke 11 is within the range of the above formula, which can improve the efficiency of the induction motor while ensuring the increase of the area of ​​the rotor slot 21. More specifically, the area of ​​the rotor slot 21 is increased, so that the cross-sectional area of ​​the aluminum material in the rotor slot 21 can be increased, and the resistance of the aluminum material can be reduced, so that the aluminum loss of the rotor core 2 is further reduced, the heat generation of the rotor core 2 is reduced, and the efficiency of the induction motor is improved.

[0037] The technical solution of the present invention can maximize the area of ​​the rotor slot 21 within a reasonable range by limiting the ratio between the stator slot 13 and the rotor slot 21, increase the cross-sectional area of ​​the aluminum material in the rotor slot 21, and reduce the resistance of the aluminum material, thereby further reducing the aluminum loss of the rotor core 2, reducing the heat generated by the rotor core 2, and improving the efficiency of the induction motor. Specifically, the slot height of the rotor slot 21 is (D7-D5) / 2, the radius of the rotor punching 20 is D3 / 2, and the slot height of the stator slot 13 is (D6-D2) / 2; the thickness of the stator yoke 11 is (D1-D6) / 2, and the distance from the slot bottom of the rotor slot 21 to the inner circle center of the rotor punching 20 is D5 / 2; Meets 1.65 3.3.

[0038] See also Figure 1 and Figure 2In one embodiment, the relationship between the slot height of the rotor slot 21 and the distance from the slot bottom of the rotor slot 21 to the inner circle center of the rotor punching 20 satisfies: 0.52≤(D7-D5) / D5≤1. Specifically, (D7-D5) / D5 refers to the ratio of the slot height of a single rotor slot 21 to the distance from the slot bottom of the rotor slot 21 to the inner circle center of the rotor punching 20. If (D7-D5) / D5 is less than 0.52, the slot height of the rotor slot 21 is relatively short, the slot area of ​​the rotor slot 21 will become smaller, the cross-sectional area of ​​the aluminum material in the rotor slot 21 will become smaller, and the resistance will become larger, thereby causing the heat generation to increase, and the maximum torque and power of the induction motor to decrease. If (D7-D5) / D5 is greater than 1, the distance from the slot bottom of the rotor slot 21 to the center of the circle becomes smaller, and the rotor slot 21 is limited by the structure and shape. The part of the rotor slot 21 close to the center of the rotor punching 20 is difficult to process and is easy to damage the processing equipment. Therefore, the ratio of the slot height of a single rotor slot 21 to the distance from the slot bottom of the rotor slot 21 to the inner circle center of the rotor punching 20 is limited to between 0.52 and 1. The ratio of the two can be 0.52, 0.58, 0.65, 0.74, 0.83, 0.91, 1, and of course other ratios are also possible, which will not be elaborated on.

[0039] See also Figures 1 to 3 In one embodiment, there is a rotor tooth 22 between two adjacent rotor slots 21, the tooth width of the rotor tooth 22 is L2, and the number of the rotor slots 21 is Q2, satisfying .

[0040] Specifically, the rotor slot 21 includes an isosceles trapezoidal portion 211, a small semicircular portion 213 and a large semicircular portion 212 which are connected. The diameter of the small semicircular portion 213 is consistent with the length of the short base of the isosceles trapezoid, and the straight side of the large semicircular portion 212 is consistent with the length of the long base of the isosceles trapezoidal portion 211. According to the obtained result, it can be understood as the diameter of the small semicircular portion 213, or it can be understood as the minimum slot width of the rotor slot 21. By limiting the diameter of the small semicircular portion 213, that is, the minimum slot width of the rotor slot 21 to the range of 0.8 mm-1.5 mm, it can be ensured that the area of ​​the rotor slot 21 is maximized within a reasonable range, thereby increasing the cross-sectional area of ​​the aluminum material in the rotor slot 21, reducing the resistance of the aluminum material, thereby further reducing the aluminum consumption of the rotor core 2, reducing the heat generation of the rotor core 2, and improving the efficiency of the induction motor.

[0041] See also Figure 2 and Figure 3 In one embodiment, the number of slots of the stator slot 13 is Q1, the tooth width of the stator tooth 12 is L1, the radius of the bottom fillet of the stator slot 13 is R1, the maximum distance between any two stator slots 13 and the line through the center of the stator punching sheet 10 is D6, the maximum distance between any two rotor slots 21 and the line through the center of the rotor punching sheet 20 is D7, and the maximum slot width range of the rotor slot 21 satisfies And / or, the maximum slot width range of the stator slot 13 satisfies . Specifically, if the rotor slot 21 is too narrow, it is not convenient to process and stamp, and the effect of die-casting aluminum or copper is not good. If the rotor slot 21 is too wide, the tooth width of the rotor tooth 22 will become smaller, which will cause the magnetic density of the rotor tooth 22 to be too high and the efficiency of the induction motor to become low. Therefore, the maximum slot width range of the rotor slot 21 is limited to 1.5 mm-6 mm, and the maximum slot width of the rotor slot 21 can be 1.5 mm, 2 mm, 2.5 mm, 3 mm, 3.5 mm, 4 mm, 4.5 mm, 5 mm, 5.5 mm, 6 mm. Similarly, if the slot width of the stator slot 13 is too narrow, on the one hand, it is not convenient to install the winding, and the cross-sectional area of ​​the winding is affected by the slot width of the stator slot 13, which will affect the efficiency of the motor. On the other hand, if the slot width of the stator slot 13 is too wide, the tooth width of the stator tooth 12 is reduced, which may easily lead to oversaturation of the magnetic flux lines of the stator tooth 12, reduce the motor efficiency, and the too narrow stator tooth 12 may affect the structural strength of the stator punching sheet 10, and the stator tooth 12 may be easily deformed or even broken. Therefore, the maximum slot width range of the stator slot 13 is limited to between 3 mm and 20 mm, and the maximum slot width of the stator slot 13 may be 3 mm, 5 mm, 8 mm, 10 mm, 12 mm, 15 mm, 18 mm, and 20 mm, for example.

[0042] In one embodiment, the number of the rotor slots 21 is 26 or 30.

[0043] See also Figure 3 In one embodiment, the rotor slot 21 is disposed adjacent to the outer circumference of the rotor sheet 20. Optionally, the rotor slot 21 is a closed slot with four sides closed, and the minimum distance from the rotor slot 21 to the outer circumference of the rotor sheet 20 is M1, satisfying 0 mm<M1≤0.5 mm.

[0044] Specifically, since the rotor slot 21 needs to be filled with a non-magnetic conductive member (usually aluminum or copper), and the liquid aluminum or copper is pressed into the rotor slot 21 to form, that is, die-casting. During the die-casting process, in order to prevent the leakage of the liquid aluminum or copper, the rotor slot 21 is provided with a pear-shaped closed slot, so that the flow of the liquid aluminum or copper can be facilitated to avoid the formation of pores.

[0045] Furthermore, the magnetic field formed by the secondary current induced in the aluminum material or the copper material may not interact with the magnetic field formed by the current passed through the stator winding, but 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 of the induction motor can be guaranteed and the weakening of the mechanical properties of the induction motor can be reduced.

[0046] At the same time, the rotor core 2 and the stator core 1 are made of stacked magnetic steel plates. By limiting the minimum distance between the rotor slots 21 and the outer peripheral surface of the rotor core 2 in the radial direction of the rotor core 2 to be greater than 0 mm, the requirements for process manufacturing can be reduced, thereby reducing production costs.

[0047] See also Figure 2 and Figure 3 In one embodiment, the rotor slot 21 includes an isosceles trapezoidal portion 211, a small semicircular portion 213 and a large semicircular portion 212 which are connected to each other. The diameter of the small semicircular portion 213 is consistent with the length of the short base of the isosceles trapezoidal portion 211, and the straight side of the large semicircular portion 212 is consistent with the length of the long base of the isosceles trapezoidal portion 211. Specifically, the shape of the rotor slot 21 is roughly a pear-shaped slot, the small semicircular portion 213 is arranged close to the center of the rotor punching 20, and the large semicircular portion 212 is arranged close to the outer circumference of the rotor punching 20. In this way, the circumferential area of ​​the rotor punching 20 can be reasonably utilized, so that the area of ​​the rotor slot 21 can be maximized. Among them, the large semicircular portion 212 protrudes toward the outer circumference of the rotor punching 20, and the small semicircular portion 213 protrudes toward the inner circumference of the rotor core 2.

[0048] See also Figure 3 In one embodiment, the slot width of the rotor slot 21 gradually decreases in the direction from the outer circumference of the rotor punching 20 to the center of the rotor punching 20. Similarly, the slot width of the rotor slot 21 is gradually reduced, which can reasonably utilize the circumferential area of ​​the rotor punching 20, so that the area of ​​the rotor slot 21 can be maximized.

[0049] In one embodiment, the rotor component further includes a plurality of aluminum parts or copper parts (not shown in the figure), and the plurality of aluminum parts or copper parts are respectively filled in the plurality of rotor slots 21. Specifically, when an appropriate single-phase current is passed through the stator winding, a secondary current can be induced in the aluminum parts or copper parts, and the magnetic field formed by the secondary current interacts with the magnetic field formed by the current passed through the stator winding, thereby driving the rotor core 2 to rotate.

[0050] The present invention also proposes a compressor, which includes the above-mentioned induction motor. The specific structure of the induction motor refers to the above-mentioned embodiment. Since the compressor adopts all the technical solutions of all the above-mentioned embodiments, it has at least all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be repeated here one by one.

[0051] The present invention further provides a refrigeration device, the refrigeration device includes a compressor, and the compressor includes the above-mentioned induction motor. The specific structure of the induction motor refers to the above-mentioned embodiment. Since the refrigeration device adopts all the technical solutions of all the above-mentioned embodiments, it at least has all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be described one by one here.

[0052] The above description is only an exemplary embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the technical concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. An induction motor, characterized in that: include: A stator component, comprising a stator core, wherein the stator core comprises a plurality of stator punching sheets stacked along its axial direction, wherein the stator punching sheets comprise a stator yoke and a plurality of stator teeth arranged inside the stator yoke and spaced apart along its circumferential direction, wherein two adjacent stator teeth form a stator slot, wherein a stator winding is wound in the stator slot; and A rotor component is arranged inside the stator component, the rotor component comprises a rotor core, the rotor core comprises a plurality of rotor punchings stacked along its axial direction, and the rotor punchings are provided with a plurality of rotor slots arranged at intervals along its circumferential direction; The slot height of the rotor slot is (D7-D5) / 2, the radius of the rotor punching is D3 / 2, the slot height of the stator slot is (D6-D2) / 2; the thickness of the stator yoke is (D1-D6) / 2, and the distance from the bottom of the rotor slot to the inner circle center of the rotor punching is D5 / 2; Satisfied: 1.65 3.

3.

2. The induction motor according to claim 1, characterized in that The relationship between the slot height of the rotor slot and the distance from the slot bottom of the rotor slot to the inner circle center of the rotor punching sheet satisfies: 0.52≤(D7-D5) / D5≤1.

3. The induction motor according to claim 1, characterized in that There is a rotor tooth between two adjacent rotor slots, the tooth width of the rotor tooth is L2, the number of the rotor slots is Q2, and the rotor slots are .

4. The induction motor according to claim 3, characterized in that The number of the stator slots is Q1, the width of the stator teeth is L1, the radius of the bottom corner of the stator slot is R1, the maximum distance between any two stator slots passing through the center of the stator punching is D6, the maximum distance between any two rotor slots passing through the center of the rotor punching is D7, and the maximum slot width range of the rotor slot satisfies ; and / or, the maximum slot width range of the stator slot satisfies .

5. The induction motor according to claim 1, characterized in that The number of the rotor slots is 26 or 30.

6. The induction motor according to claim 1, characterized in that The rotor slot is arranged adjacent to the outer peripheral surface of the rotor punching sheet.

7. The induction motor according to claim 6, characterized in that The rotor slot is a closed slot which is closed on all sides, and the minimum distance between the rotor slot and the outer peripheral surface of the rotor punching sheet is M1, which satisfies 0 mm <M1≤0.5 mm.

8. The induction motor according to claim 1, characterized in that The rotor slot includes an isosceles trapezoidal portion, a small semicircular portion and a large semicircular portion which are connected. The diameter of the small semicircular portion is consistent with the length of the short base of the isosceles trapezoid, and the straight side of the large semicircular portion is consistent with the length of the long base of the isosceles trapezoidal portion.

9. The induction motor according to claim 8, characterized in that The large semicircular portion protrudes toward the outer circumferential surface of the rotor punching sheet, and the small semicircular portion protrudes toward the inner circumferential surface of the rotor core.

10. The induction motor according to claim 1, characterized in that In the direction from the outer circumference of the rotor punching to the center of the rotor punching, the slot width of the rotor slot gradually decreases.

11. The induction motor according to claim 1, characterized in that The rotor component further includes a plurality of aluminum pieces or copper pieces, and the plurality of aluminum pieces or copper pieces are respectively filled in the plurality of rotor slots.

12. A compressor, characterized in that: Comprising an induction motor as claimed in any one of claims 1 to 11.

13. A refrigeration device, characterized in that: Comprising the compressor of claim 12.

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