Induction motor and scroll compressor

Abstract

The invention provides an induction motor and a scroll compressor, and relates to the field of scroll compressor design and manufacture, the induction motor comprises a stator iron core and a rotor iron core, a first conductor placing groove of the stator iron core is provided with a plurality of turns of round enameled wires and insulation paper, the round enameled wires are composed of insulation patent leather, copper materials and aluminum materials, and the insulation patent leather is made of insulation material. Cast aluminum is placed in the second conductor placing groove of the rotor iron core. Kq, Ks, Kf and Kd are limited to meet the relation that [Kf * (1-Kd) + Kq * Ks] / (Kf * Kd) is larger than or equal to 10.216 and smaller than or equal to 16.844, so that the purposes of improving the motor efficiency and reducing the cost are achieved; and meanwhile, the first conductor placement groove, the second conductor placement groove and the heat dissipation through groove are subjected to size constraint, so that the motor efficiency is further improved, and the motor cost is further reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of compressor design and manufacturing, in particular, relates to an induction motor and scroll compressor. BACKGROUND

[0002] The induction motor is widely used in scroll compressor as power source due to its simple structure, easy manufacturing, reliable operation and low noise. In addition, according to user's demand, the induction motor can realize multi-mode stable operation of fixed frequency and variable frequency through reasonable electromagnetic design.

[0003] During the process of dragging the scroll compressor moving scroll to rotate, the induction motor often exists the situation of big horse pulling small cart or power mismatch, low efficiency and power factor, which increases the cost of the motor. In addition, the weight of the motor itself is large, which brings difficulties to the manufacturing and assembly of the motor, especially for the vertical type compressor. Therefore, within the temperature limit, it is of great significance to make the load and the motor have high matching degree, ensure the motor to have high efficiency in a wider load range, and make the motor have small weight and low cost through reasonable electromagnetic design.

[0004] The present application aims to provide an induction motor and scroll compressor technology to achieve the purposes of improving motor efficiency, reducing motor weight and cost, etc. SUMMARY

[0005] In view of the above-mentioned deficiencies of the existing induction motor during the process of dragging the scroll compressor moving scroll to rotate, an induction motor and scroll variable frequency compressor are provided. In the present application, by limiting the relationship between Kq, Ks, Kf and Kd to satisfy 10.216≤[Kf×(1-Kd)+Kq×Ks] / (Kf×Kd)≤16.844, the purposes of increasing motor efficiency and reducing cost are achieved. At the same time, the size of the first conductor placement slot, the second conductor placement slot and the heat dissipation slot is restricted, which further increases the motor efficiency and reduces the motor cost.

[0006] The technical means adopted by the present application are as follows:

[0007] An induction motor, comprising an outer stator core and an inner rotor core. The stator core comprises a plurality of uniformly distributed first magnetic teeth, a first magnetic yoke and a first conductor placement slot, a plurality of turns of circular enameled wire and insulating paper are arranged in the first conductor placement slot, the circular enameled wire is composed of an outermost insulating paint, a middle layer of copper material and an innermost aluminum material, and the outer side of the stator core is further hollowed out to form a heat dissipation slot. The rotor core comprises a plurality of uniformly distributed second magnetic teeth, a second magnetic yoke and a second conductor placement slot, cast aluminum is arranged in the second conductor placement slot, and a magnetic bridge is further arranged on the outer side of the rotor core. Define the ratio of the second conductor placement slot quantity Q2 and the first conductor placement slot quantity Q1 as Kq, the difference between the first conductor placement slot quantity Q1 and the second conductor placement slot quantity Q2 as AQ, satisfying: 1.1 Define the cross-sectional area of the first conductor placement slot as S1, the cross-sectional area of the second conductor placement slot as S2, the ratio of the cross-sectional area of the second conductor placement slot to the cross-sectional area of the first conductor placement slot as Ks=S2 / S1, satisfying: 0.288 Define the conductor filling rate of the first conductor placement slot as Kf, the copper material occupancy rate of the circular enameled wire as Kd, satisfying: 10.216≤[Kf×(1-Kd)+Kq×Ks] / (Kf×Kd)≤16.844.

[0008] Further, the maximum outer radius of the stator core is R11, the outer radius of the rotor core is R2, and R11 and R2 satisfy 0.442

[0009] Further, the two side edges of the first magnetic conductive tooth and the two side edges of the second magnetic conductive tooth are parallel; The width of the first magnetic conductive tooth is W1, the width of the second magnetic conductive tooth is W2, and W1 and W2 satisfy 0.6

[0010] Further, the thickness of the first magnetic yoke is non-uniform, and the thickness of the second magnetic yoke is uniform; The minimum thickness of the first magnetic yoke is Y11, the maximum thickness of the first magnetic yoke is Y12, and the thickness of the second magnetic yoke is Y2, satisfying 1

[0011] Further, define the total cross-sectional area of the heat dissipation slot as Ss, with the unit being mm 2 , Ss satisfies: 20.3%×π×(R11-R2) 2 ≤Ss≤28.2%×π×(R11-R2) 2 .

[0012] Further, the outer side of the first conductor placement slot is a circular arc with a radius of Rs1, and the circular arc is tangent to the two side edges of the first magnetic tooth; The inner side of the first conductor placement slot is opened to form a rectangular slot, the width of the rectangular slot is bs1, and the height is hs1; The rectangular slot and the side edge of the first magnetic tooth form a shoulder, and the connection is rounded; the height of the shoulder is hs2; The rectangular slot width bs1 and height hs1, the slot shoulder height hs2 satisfy hs2≤hs1≤bs1≤3×hs1.

[0013] Further, the stator core inner radius is defined as R12, and the magnetic conductive bridge thickness is h, satisfying: 0.5×(R12-R2)≤h<R12-R2.

[0014] Further, the second conductor placement slot outer side and inner side are both circular arcs, and the circular arc radii are Rr1 and Rr2 respectively; The circular arcs of the second conductor placement slot outer side and inner side are tangent to the two side edges of the second magnetic conductive tooth; The two circular arc radii of the second conductor placement slot outer side and inner side and the first conductor placement slot outer side circular arc radius satisfy: Rr2<Rr1<Rs1.

[0015] The application also provides a scroll compressor comprising the induction motor.

[0016] Compared with the prior art, the application has the following advantages: 1. Firstly, the ratio of the second conductor placement slot quantity Q2 to the first conductor placement slot quantity Q1 is Kq, satisfying 1.1<Kq=Q2 / Q1<1.3, and the difference AQ between the first conductor placement slot quantity Q1 and the second conductor placement slot quantity Q2 satisfies AQ=Q2-Q1=2×k, wherein the value of k is 2 or 3 or 4. Secondly, the ratio of the second conductor placement slot quantity Q2 to the first conductor placement slot quantity Q1 is Kq, the ratio of the second conductor placement slot cross-sectional area to the first conductor placement slot cross-sectional area is Ks=S2 / S1, the conductor filling rate of the first conductor placement slot is Kf, and the copper material occupancy rate of the circular enameled wire is Kd, satisfying: 10.216≤[Kf×(1-Kd)+Kq×Ks] / (Kf×Kd)≤16.844, which can ensure uniform magnetic circuit distribution, reduce stray loss and resistance loss, increase efficiency, and reduce cost.

[0017] 2. By limiting: (1) the stator core maximum outer radius R11 and the rotor core outer radius R2 satisfy 0.442<R2 / R11<0.461; (2) the first magnetic conductive tooth width W1 and the second magnetic conductive tooth width W2 satisfy 0.6<W2 / W1<0.8; (3) the first magnetic yoke minimum thickness Y11, the first magnetic yoke maximum thickness Y12, and the second magnetic yoke thickness Y2 satisfy 1≤(Y12+Y2) / Y11≤1.6.

[0018] The air gap magnetic density can be guaranteed to be reasonably distributed, the tooth magnetic density and yoke magnetic density value can be maintained in a reasonable range, the ferromagnetic material is fully utilized, and the first conductor placement slot space is reasonably arranged.

[0019] 3. By satisfying 20.3% x π x (R11-R2) 2 ≤Ss≤28.2% x π x (R11-R2) 2 Without affecting the magnetic circuit, the motor heat dissipation can be accelerated, the motor temperature rise can be reduced, the resistance loss can be reduced, the motor efficiency can be further increased, and the motor weight can be reduced.

[0020] 4. By correlatively limiting the shape and size of the first conductor placement slot and the second conductor placement slot, the conductive material and the magnetic material can be reasonably distributed, so that the motor weight cost can be further reduced. BRIEF DESCRIPTION OF DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or prior art description will be briefly introduced below. Obviously, the drawings in the following description are some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0022] Figure 1 It is a structural schematic diagram of the induction motor of the present application.

[0023] Figure 2 It is a structural schematic diagram of the stator core in the present application.

[0024] Figure 3 It is Figure 2 a partial enlarged view of A in the present application.

[0025] Figure 4 It is a structural schematic diagram of the circular enameled wire in the present application.

[0026] Figure 5 It is a structural schematic diagram of the rotor core in the present application.

[0027] Figure 6 It is Figure 5 a partial enlarged view of A in the present application.

[0028] Figure 7 It is Figure 5 a partial enlarged view of B in the present application.

[0029] Figure 8 It is a cost comparison diagram of electromagnetic materials of the induction motor of the present application and prior art.

[0030] Figure 9 It is an efficiency curve diagram of the induction motor of the present application.

[0031] Figure 10 Fig. 1 is a speed curve diagram of the induction motor of the present application.

[0032] In the figure: 1, induction motor; 11, stator core; 111, first magnetic tooth; 112, first magnetic yoke; 113, first conductor placement slot; 1131, round enameled wire; 1131a, insulating paint; 1131b, copper material; 1131c, aluminum material; 1132, insulating paper; 1133, rectangular slot; 1134, slot shoulder; 114, heat dissipation through slot; 12, rotor core; 121, second magnetic tooth; 122, second magnetic yoke; 123, second conductor placement slot; 1231, cast aluminum; 124, magnetic bridge. DETAILED DESCRIPTION

[0033] It should be noted that the embodiments and features of the embodiments in the present application can be combined with each other without conflict. The technical solutions in the embodiments of the present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0034] In order to make the purposes, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below in combination with the drawings of the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. The description of the at least one exemplary embodiment is actually only illustrative, but not as any limitation on the present application and its application or use. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0035] It should be noted that the terms used herein are only for describing specific embodiments, and are not intended to limit the exemplary embodiments according to the present application. As used herein, the singular form is intended to include the plural form, unless the context clearly indicates otherwise, and it should also be understood that when the terms "comprise" and / or "include" are used in the specification, there is a feature, step, operation, device, component and / or combination thereof.

[0036] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of the invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following figures denote similar items; therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0037] like Figures 1-6 As shown, the present invention provides an induction motor 1, which includes an outer stator core 11 and an inner rotor core 12. The stator core 11 includes multiple uniformly distributed first magnetic teeth 111, a first magnetic yoke 112, and a first conductor placement slot 113. Multiple turns of circular enameled wire 1131 and insulating paper 1132 are disposed in the first conductor placement slot 113. The circular enameled wire 1131 is composed of an outermost insulating enamel coating 1131a, a middle layer of copper material 1131b, and an innermost layer of aluminum material 1131c. The outer side of the stator core 11 is also hollowed out to form a heat dissipation channel 114. The rotor core 12 includes multiple uniformly distributed second magnetic teeth 121, a second magnetic yoke 122, and a second conductor placement slot 123. Cast aluminum 1231 is placed in the second conductor placement slot 123. A magnetic bridge 124 is also provided on the outer side of the rotor core 12.

[0038] Define the ratio of the number of second conductor placement slots 123 (Q2) to the number of first conductor placement slots 113 (Q1) as Kq, and the difference between the number of first conductor placement slots 113 (Q1) and the number of second conductor placement slots 123 (Q2) as ΔQ, satisfying: 1.1 < Kq = Q2 / Q1 < 1.3, and ΔQ = Q2 - Q1 = 2 × k, where k takes the value of 2, 3, or 4.

[0039] Define the cross-sectional area of ​​the first conductor placement slot 113 as S1, the cross-sectional area of ​​the second conductor placement slot 123 as S2, and define the ratio of the cross-sectional area of ​​the second conductor placement slot 123 to the cross-sectional area of ​​the first conductor placement slot 113 as Ks, Ks=S2 / S1, satisfying: 0.288<Ks<0.452; The conductor filling rate of the first conductor placement slot 113 is defined as Kf, and the copper material 1131b occupancy rate of the round enameled wire 1131 is Kd, satisfying: 10.216≤[Kf×(1-Kd)+Kq×Ks] / (Kf×Kd)≤16.844.

[0040] By limiting the above quantities, the conductive material and the magnetic material can be reasonably distributed in a certain accommodation space, so as to ensure uniform magnetic circuit distribution, reduce stray loss and resistance loss, increase efficiency, and reduce cost.

[0041] Preferably, in the case of determining the compressor shell inner diameter, by keeping the maximum outer radius R11 of the stator core 11 and the outer radius R2 of the rotor core 12 satisfying 0.442 < R2 / R11 < 0.461, the motor output power can meet the demand of the load, so that the load and the motor power are reasonably matched.

[0042] Preferably, to avoid the problems of magnetic density saturation, increased iron loss caused by excessive local magnetic density in the rotor core 12 and the stator core 11, and low material utilization caused by excessive local magnetic density, the two sides of the first magnetic tooth 111 and the two sides of the second magnetic tooth 121 are parallel, the width W1 of the first magnetic tooth 111 and the width W2 of the second magnetic tooth 121 satisfy 0.6 < W2 / W1 < 0.8.

[0043] Preferably, the thickness of the first magnetic yoke 112 is non-uniform, and the thickness of the second magnetic yoke 122 is uniform; the minimum thickness Y11 of the first magnetic yoke 112, the maximum thickness Y12 of the first magnetic yoke 112, and the thickness Y2 of the second magnetic yoke 122 satisfy 1 ≤ (Y12+Y2) / Y11 ≤ 1.6, so as to reduce the magnetic density harmonic content, suppress vibration noise, and leave enough space for the opening of the heat dissipation slot 114.

[0044] Preferably, the total cross-sectional area of the heat dissipation slot 114 is defined as Ss, with the unit of mm 2 , satisfying: 20.3%×π×(R11-R2) 2 ≤Ss≤28.2%×π×(R11-R2) 2 Without affecting the magnetic circuit, the motor can be accelerated to dissipate heat, reduce the temperature rise of the motor, and reduce the resistance loss, thereby reducing the weight of the motor and further increasing the efficiency of the motor.

[0045] Preferably, the outer side of the first conductor placement slot 113 is a circular arc with a radius Rs1, and the circular arc is tangent to the two side edges of the first magnetic tooth 111; the inner side of the first conductor placement slot 113 is opened to form a rectangular slot 1133, the rectangular slot 1133 has a width bs1 and a height hs1; the rectangular slot 1133 and the side edge of the first magnetic tooth 111 form a slot shoulder 1134, and the connecting part is rounded; the height of the slot shoulder 1134 is hs2; the width bs1 and the height hs1 of the rectangular slot 1133 and the height hs2 of the slot shoulder 1134 satisfy hs2≤hs1≤bs1≤3×hs1. After the above limitations, the multiple turns of the circular enameled wire 1131 can be conveniently embedded into the first conductor placement slot 113 by machine or manually, and a high conductor filling rate is ensured, so as to increase the power density and improve the efficiency.

[0046] Preferably, the inner radius of the stator core 11 is R12, and the thickness of the magnetic bridge 124 is h, which satisfies the relationship 0.5×(R12-R2)≤h<R12-R2, so as to simplify the die, reduce the mold cost, and reduce the stray loss.

[0047] Preferably, the outer side and the inner side of the second conductor placement slot 123 are circular arcs, the radius of the outer side circular arc is Rr1, and the radius of the inner side circular arc is Rr2; the outer side and the inner side of the second conductor placement slot 123 are tangent to the two side edges of the second magnetic tooth 121; the two radii of the outer side and the inner side of the second conductor placement slot 123 satisfy Rr2<Rr1<Rs1, so as to further improve the efficiency and reduce the cost.

[0048] In the embodiment, the main parameters are shown in the following table: Table: Specific values of main parameters in the embodiment

[0049] It should be noted that the "prior art" appearing below refers to any one or more limitations not meeting the above table.

[0050] Taking a compressor with a rated voltage of 380V, a frequency of 50Hz, a refrigerant of R410A, and a discharge capacity of 145CC as an example, the electromagnetic material cost comparison chart of the induction motor of the present application and the prior art under the condition of meeting the compressor load demand is as shown in Figure 8 .

[0051] From Figure 8 it can be seen that, by reasonably restricting and limiting, compared with the prior art, the electromagnetic material cost is reduced by 20.55% after using the induction motor of the present application. It is proved that the power density can be increased and the cost can be greatly reduced after using the present application.

[0052] The motor efficiency and motor speed change curves under different output powers are as shown inFigure 9 and Figure 10 As shown.

[0053] Depend on Figure 9 It can be seen that the motor maintains high efficiency over a wide range of output power. From Figure 10 It can be seen that the motor has a high speed and a stiff speed characteristic under a wide range of output power. From the output power range of 1.56kW to 13.5kW, the speed only decreases by 4%.

[0054] In summary, by Figures 8-10 It can be seen that by adopting the implementation method of the present invention, while significantly reducing costs, high efficiency is maintained over a wide operating range.

[0055] The present invention also proposes a scroll compressor employing the induction motor 1 described above. The induction motor 1 and other structures and operations of the scroll compressor are known to those skilled in the art and will not be described in detail here.

[0056] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. An induction motor characterized by, The stator core comprises an outer side and a rotor core; The stator core comprises a plurality of uniformly distributed first magnetic teeth, a first magnetic yoke and a first conductor placement slot, the first conductor placement slot is provided with a plurality of turns of circular enameled wire and insulation paper, the circular enameled wire is composed of an outermost layer of insulation paint, a middle layer of copper material and an innermost layer of aluminum material, and the outer side of the stator core is hollowed out to form a heat dissipation channel; The rotor core comprises a plurality of uniformly distributed second magnetic teeth, a second magnetic yoke and a second conductor placement slot, the second conductor placement slot is provided with cast aluminum, and the outer side of the rotor core is provided with a magnetic bridge; The ratio of the number of second conductor placement slots Q2 to the number of first conductor placement slots Q1 is defined as Kq, and the difference between the number of first conductor placement slots Q1 and the number of second conductor placement slots Q2 is ΔQ, which satisfies 1.1 The cross-sectional area of the first conductor placement slot is defined as S1, the cross-sectional area of the second conductor placement slot is defined as S2, and the ratio of the cross-sectional area of the second conductor placement slot to the cross-sectional area of the first conductor placement slot is Ks=S2 / S1, which satisfies 0.288 The conductor filling rate of the first conductor placement slot is defined as Kf, and the copper material occupancy rate of the circular enameled wire is defined as Kd, which satisfies 10.216≤[Kf×(1-Kd)+Kq×Ks] / (Kf×Kd)≤16.

844.

2. The induction motor of claim 1, wherein, The maximum outer radius of the stator core is R11, the outer radius of the rotor core is R2, and R11 and R2 satisfy 0.442 3. The induction motor of claim 1, wherein, The two side edges of the first magnetic tooth and the two side edges of the second magnetic tooth are parallel; The width of the first magnetic tooth is W1, and the width of the second magnetic tooth is W2, which satisfies 0.6 4. The induction motor of claim 1, wherein, The thickness of the first magnetic yoke is non-uniform, and the thickness of the second magnetic yoke is uniform; The minimum thickness of the first magnetic yoke is Y11, the maximum thickness of the first magnetic yoke is Y12, and the thickness of the second magnetic yoke is Y2, which satisfies 1≤(Y12+Y2) / Y11≤1.

6.

5. The induction motor of claim 2, wherein, The total cross-sectional area of the heat dissipation channel is defined as Ss, with units of mm 2 Ss satisfies: 20.3% x π x (R11-R2) 2 ≤ Ss ≤ 28.2% x π x (R11-R2) 2 .

6. The induction motor of claim 1, wherein, The outer side of the first conductor placement slot is a circular arc with a radius of Rs1, and the circular arc is tangent to the two side edges of the first magnetic tooth; The inner side of the first conductor placement slot is opened to form a rectangular slot, the width of the rectangular slot is bs1, and the height is hs1; The rectangular slot and the side edge of the first magnetic tooth form a shoulder, and the connection is rounded, and the height of the shoulder is hs2; The width bs1 and the height hs1 of the rectangular slot, and the height hs2 of the shoulder satisfy hs2≤hs1≤bs1≤3×hs1.

7. The induction motor of claim 2, wherein, The inner radius of the stator core is R12, and the thickness of the magnetic bridge is h, which satisfies 0.5×(R12-R2)≤h 8. The induction motor of claim 6, wherein, The outer side and the inner side of the second conductor placement slot are circular arcs with radii Rr1 and Rr2, respectively; The outer side and the inner side of the second conductor placement slot are tangent to the two side edges of the second magnetic tooth. The two radii of the circular arcs outside and inside the second conductor placement slot and the radius of the circular arc outside the first conductor placement slot satisfy: Rr2 9. A scroll compressor characterized by comprising: An induction motor comprising a stator according to any one of claims 1 to 8.

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