Induction motor and scroll compressor
By optimizing the conductor placement slots and core structure of the induction motor, the power mismatch problem of the induction motor in the scroll compressor was solved, achieving a high-efficiency, low-cost, and lightweight motor design.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- DALIAN SANYO COMPRESSOR
- Filing Date
- 2026-03-13
- Publication Date
- 2026-05-26
Smart Images
Figure CN121841040B_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the technical field of compressor design and manufacturing, and more particularly to an induction motor and a scroll compressor. Background Technology
[0002] Induction motors are widely used as power sources for scroll compressors due to their advantages such as simple structure, easy manufacturing, reliable operation, and low noise. In addition, according to user needs, stable operation in multiple modes of fixed frequency and variable frequency can be achieved through reasonable electromagnetic design.
[0003] When an induction motor drives the rotating scroll of a scroll compressor, it often suffers from over-engineering or power mismatch, resulting in low efficiency and power factor, which increases the motor's cost. Furthermore, the motor's weight is significant, posing challenges to its manufacturing and assembly, especially for vertical compressors. Therefore, within the temperature rise limit, it is crucial to achieve a high degree of matching between the load and the motor through reasonable electromagnetic design, ensuring high efficiency, low weight, and low cost across a wider load range.
[0004] The present invention aims to provide an induction motor and scroll compressor technology to improve motor efficiency, reduce motor weight and cost, etc. Summary of the Invention
[0005] To address the shortcomings of existing induction motors in driving the rotating scroll disc of a scroll compressor, this invention provides an induction motor and a scroll-type variable frequency compressor. By limiting the relationships between Kq, Ks, Kf, and Kd to 10.216 ≤ [Kf×(1-Kd)+Kq×Ks] / (Kf×Kd) ≤ 16.844, this invention increases motor efficiency and reduces costs. Furthermore, by imposing dimensional constraints on the first conductor placement slot, the second conductor placement slot, and the heat dissipation channel, motor efficiency is further increased while motor costs are reduced.
[0006] The technical means employed in this invention are as follows:
[0007] An induction motor includes an outer stator core and an inner rotor core.
[0008] The stator core includes multiple evenly distributed first magnetic teeth, a first magnetic yoke, and a first conductor placement slot. Multiple turns of circular enameled wire and insulating paper are placed in the first conductor placement slot. The circular enameled wire is composed of an outermost insulating enamel layer, a middle layer of copper material, and an innermost layer of aluminum material. The outside of the stator core is also hollowed out to form a heat dissipation channel.
[0009] The rotor core includes multiple uniformly distributed second magnetic teeth, a second magnetic yoke, and a second conductor placement slot. Cast aluminum is provided in the second conductor placement slot, and a magnetic bridge is also provided on the outside of the rotor core.
[0010] Define the ratio of the number of second conductor placement slots Q2 to the number of first conductor placement slots Q1 as Kq, and the difference between the number of first conductor placement slots Q1 and the number of second conductor placement slots 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;
[0011] 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, 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 as Ks = S2 / S1, satisfying: 0.288 < Ks < 0.452;
[0012] Define the conductor filling rate of the first conductor placement slot as Kf, and the copper material occupancy rate of the round enameled wire as Kd, satisfying: 10.216≤[Kf×(1-Kd)+Kq×Ks] / (Kf×Kd)≤16.844.
[0013] Furthermore, the maximum outer radius of the stator core is R11, and the outer radius of the rotor core is R2, wherein R11 and R2 satisfy 0.442 < R2 / R11 < 0.461.
[0014] Furthermore, the two sides of the first magnetic tooth and the two sides of the second magnetic tooth are parallel;
[0015] The width of the first magnetic tooth is W1, and the width of the second magnetic tooth is W2. The relationship between W1 and W2 is 0.6 < W2 / W1 < 0.8.
[0016] Furthermore, the thickness of the first magnetic yoke is non-uniform, while the thickness of the second magnetic yoke is uniform.
[0017] 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≤(Y12+Y2) / Y11≤1.6.
[0018] Furthermore, the total cross-sectional area of the heat dissipation channel is defined as Ss, in mm. 2 Ss satisfies: 20.3%×π×(R11) 2 -R2 2 )≤Ss≤28.2%×π×(R11 2 -R2 2 ).
[0019] Furthermore, the outer side of the first conductor placement slot is an arc with a radius of Rs1, and the arc is tangent to the two sides of the first magnetic tooth;
[0020] The first conductor is placed in the groove with an opening to form a rectangular groove, the width of which is bs1 and the height is hs1;
[0021] The rectangular groove connects with the side of the first magnetic tooth to form a groove shoulder, and the connection is rounded. The height of the groove shoulder is hs2.
[0022] The rectangular groove has a width bs1 and a height hs1, and the groove shoulder height hs2 satisfies hs2≤hs1≤bs1≤3×hs1.
[0023] Furthermore, the inner radius of the stator core is defined as R12, and the thickness of the magnetic bridge is h, satisfying: 0.5×(R12-R2)≤h<R12-R2.
[0024] Furthermore, the outer and inner sides of the second conductor placement groove are both arcs, with arc radii of Rr1 and Rr2 respectively;
[0025] The arcs on the outer and inner sides of the second conductor placement slot are tangent to the two sides of the second magnetic tooth;
[0026] The two arc radii on the outer and inner sides of the second conductor placement slot satisfy the following relationship with the outer arc radius of the first conductor placement slot: Rr2 < Rr1 < Rs1.
[0027] The present invention also provides a scroll compressor, including the aforementioned induction motor.
[0028] Compared with the prior art, the present invention has the following advantages:
[0029] 1. First, in this invention, the ratio of the number of second conductor placement slots Q2 to the number of first conductor placement slots Q1 is Kq, which satisfies 1.1 < Kq = Q2 / Q1 < 1.3, and the difference ΔQ between the number of first conductor placement slots Q1 and the number of second conductor placement slots Q2 satisfies ΔQ = Q2 - Q1 = 2 × k, where k takes the value of 2, 3 or 4;
[0030] Secondly, the following conditions must be met: the ratio of the number of second conductor placement slots Q2 to the number of first conductor placement slots Q1 is Kq, 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, the conductor filling rate of the first conductor placement slot is Kf, and the copper material occupancy rate of the round enameled wire is Kd. This ensures that the magnetic circuit distribution is uniform, stray losses and resistance losses are reduced, efficiency is increased, and costs are reduced.
[0031] 2. By limiting:
[0032] (1) The maximum outer radius of the stator core R11 and the outer radius of the rotor core R2 satisfy 0.442 < R2 / R11 < 0.461;
[0033] (2) The width W1 of the first magnetic tooth and the width W2 of the second magnetic tooth satisfy 0.6 < W2 / W1 < 0.8;
[0034] (3) 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 satisfy 1≤(Y12+Y2) / Y11≤1.6.
[0035] It can ensure a reasonable distribution of air gap magnetic flux density, maintain the values of tooth magnetic flux density and yoke magnetic flux density within a reasonable range, make full use of ferromagnetic materials, and rationally arrange the space for the first conductor placement slot.
[0036] 3. By ensuring that the total cross-sectional area Ss of the heat dissipation channel satisfies 20.3%×π×(R11) 2 -R2 2 )≤Ss≤28.2%×π×(R11 2 -R2 2 Without affecting the magnetic circuit, it can accelerate motor heat dissipation, reduce motor temperature rise, reduce resistance loss, thereby further increasing motor efficiency and reducing motor weight.
[0037] 4. By limiting the shape and size of the first conductor placement slot and the second conductor placement slot, conductive and magnetic materials can be rationally allocated to further reduce the weight and cost of the motor. Attached Figure Description
[0038] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0039] Figure 1 This is a schematic diagram of the structure of the induction motor of the present invention.
[0040] Figure 2 This is a schematic diagram of the stator core structure in this invention.
[0041] Figure 3 for Figure 2 A magnified view of part A in the image.
[0042] Figure 4 This is a schematic diagram of the circular enameled wire structure in this invention.
[0043] Figure 5 This is a schematic diagram of the rotor core structure in this invention.
[0044] Figure 6 for Figure 5 A magnified view of part A in the image.
[0045] Figure 7 for Figure 5 A magnified view of part B in the image.
[0046] Figure 8 This is a cost comparison chart of electromagnetic materials used in the induction motor of this invention and those of existing technologies.
[0047] Figure 9 This is an efficiency curve of the induction motor of the present invention.
[0048] Figure 10 This is a speed curve of the induction motor of the present invention.
[0049] In the diagram: 1. Induction motor; 11. Stator core; 111. First magnetic tooth; 112. First magnetic yoke; 113. First conductor placement slot; 1131. Circular enameled wire; 1131a. Insulating enamel coating; 1131b. Copper material; 1131c. Aluminum material; 1132. Insulating paper; 1133. Rectangular slot; 1134. Slot shoulder; 114. Heat dissipation slot; 12. Rotor core; 121. Second magnetic tooth; 122. Second magnetic yoke; 123. Second conductor placement slot; 1231. Cast aluminum; 124. Magnetic bridge. Detailed Implementation
[0050] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.
[0051] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present invention or its application or use. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.
[0052] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of exemplary embodiments according to the invention. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.
[0053] 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.
[0054] like Figure 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.
[0055] 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.
[0056] 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;
[0057] 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.
[0058] By limiting the above quantities, conductive and magnetic materials can be rationally distributed within a certain space, ensuring uniform magnetic circuit distribution, reducing stray losses and resistance losses, increasing efficiency, and reducing costs.
[0059] Preferably, with the inner diameter of the compressor housing determined, by maintaining the maximum outer radius R11 of the stator core 11 and the outer radius R2 of the rotor core 12 to satisfy 0.442 < R2 / R11 < 0.461, the motor output power can meet the load requirements, thus achieving a reasonable match between the load and the motor power.
[0060] Preferably, to avoid the problems of magnetic saturation and increased iron loss caused by excessive local magnetic flux density in the rotor core 12 and stator core 11, or low material utilization caused by excessive local magnetic flux 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.
[0061] Preferably, the thickness of the first magnetic yoke 112 is non-uniform, while the thickness of the second magnetic yoke 122 is uniform; the minimum thickness of the first magnetic yoke 112 is Y11, the maximum thickness of the first magnetic yoke 112 is Y12, and the thickness Y2 of the second magnetic yoke 122 satisfies 1≤(Y12+Y2) / Y11≤1.6, so as to reduce the magnetic flux density harmonic content, suppress vibration noise, and leave sufficient space for the opening of the heat dissipation channel 114.
[0062] Preferably, the total cross-sectional area of the heat dissipation channel 114 is defined as Ss, in mm. 2 Satisfying: 20.3% × π × (R11) 2 -R2 2 )≤Ss≤28.2%×π×(R11 2 -R2 2 Without affecting the magnetic circuit, it can accelerate motor heat dissipation, reduce motor temperature rise, reduce resistance loss, thereby reducing motor weight and further increasing motor efficiency.
[0063] Preferably, the outer side of the first conductor placement groove 113 is an arc with a radius of Rs1, and the arc is tangent to the two sides of the first magnetic tooth 111; the inner side of the first conductor placement groove 113 is opened to form a rectangular groove 1133, the width of the rectangular groove 1133 is bs1 and the height is hs1; the rectangular groove 1133 connects with the side of the first magnetic tooth 111 to form a groove shoulder 1134, and the connection is rounded, the height of the groove shoulder 1134 is hs2; the width bs1 and height hs1 of the rectangular groove 1133, and the height hs2 of the groove shoulder 1134 satisfy hs2≤hs1≤bs1≤3×hs1. After the above limitations are made, it is convenient to mechanically or manually embed multiple turns of circular enameled wire 1131 into the first conductor placement groove 113, and a high conductor filling rate is ensured, thereby increasing power density and improving efficiency.
[0064] Preferably, the inner radius of the stator core 11 is R12 and the thickness of the magnetic bridge 124 is h, satisfying the relationship 0.5×(R12-R2)≤h<R12-R2, which can simplify the punching die, reduce the mold cost, and reduce stray loss.
[0065] Preferably, the outer and inner sides of the second conductor placement groove 123 are both arcs, with the outer arc radius being Rr1 and the inner arc radius being Rr2; the arcs on the outer and inner sides of the second conductor placement groove 123 are tangent to the two sides of the second magnetic tooth 121; the two arc radii on the outer and inner sides of the second conductor placement groove 123 satisfy the following relationship with the outer arc radius of the first conductor placement groove 113: Rr2 < Rr1 < Rs1, so as to further improve efficiency and reduce cost.
[0066] The main parameters in this embodiment are shown in the table below:
[0067] Table: Specific values of key parameters in this embodiment
[0068]
[0069] It should be noted that "prior art" as used below refers to technology that does not meet any one or more of the limitations in the table above.
[0070] Taking a compressor with a rated voltage of 380V, a frequency of 50Hz, a refrigerant of R410A, and a displacement of 145CC as an example, the cost comparison chart of electromagnetic materials between the induction motor of this invention and existing technologies, under the condition of meeting the compressor load requirements, is as follows. Figure 8 As shown.
[0071] from Figure 8 As can be seen, with reasonable constraints, the cost of electromagnetic materials is reduced by 20.55% compared to existing technologies when using the induction motor of this invention. This proves that the power density can be increased and the cost can be significantly reduced when using this invention.
[0072] The curves showing the changes in motor efficiency and motor speed under different output powers are as follows: Figure 9 and Figure 10 As shown.
[0073] 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%.
[0074] 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.
[0075] 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.
[0076] 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; and these 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 in that, This includes the outer stator core and the inner rotor core; The stator core includes multiple evenly distributed first magnetic teeth, a first magnetic yoke, and a first conductor placement slot. Multiple turns of circular enameled wire and insulating paper are placed in the first conductor placement slot. The circular enameled wire is composed of an outermost insulating enamel layer, a middle layer of copper material, and an innermost layer of aluminum material. The outside of the stator core is also hollowed out to form a heat dissipation channel. The rotor core includes multiple uniformly distributed second magnetic teeth, a second magnetic yoke, and a second conductor placement slot. Cast aluminum is disposed in the second conductor placement slot, and a magnetic bridge is also provided on the outside of the rotor core. The two sides of the first magnetic teeth and the two sides of the second magnetic teeth are parallel. Define the ratio of the number of second conductor placement slots Q2 to the number of first conductor placement slots Q1 as Kq, and the difference between the number of first conductor placement slots Q1 and the number of second conductor placement slots 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; 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, 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 as Ks = S2 / S1, satisfying: 0.288 < Ks < 0.452; Define the conductor filling rate of the first conductor placement slot as Kf, and the copper material occupancy rate of the round enameled wire as Kd, satisfying: 10.216≤[Kf×(1-Kd)+Kq×Ks] / (Kf×Kd)≤16.844; The outer side of the first conductor placement slot is an arc with a radius of Rs1, and the arc is tangent to the two sides of the first magnetic tooth; The first conductor is placed inside the slot and an opening is made to form a rectangular slot with a width of bs1 and a height of hs1. The rectangular slot is connected to the side of the first magnetic tooth to form a slot shoulder, and the connection is rounded. The height of the slot shoulder is hs2. The width of the rectangular slot bs1 and the height of the slot shoulder hs1 satisfy hs2≤hs1≤bs1≤3×hs1. The outer and inner sides of the second conductor placement slot are both arcs with radii Rr1 and Rr2 respectively; the arcs on the outer and inner sides of the second conductor placement slot are tangent to the two sides of the second magnetic tooth; the radii of the two arcs on the outer and inner sides of the second conductor placement slot satisfy the following relationship with the outer arc radius of the first conductor placement slot: Rr2 < Rr1 < Rs1.
2. The induction motor according to claim 1, characterized in that, The maximum outer radius of the stator core is R11, and the outer radius of the rotor core is R2. R11 and R2 satisfy 0.442 < R2 / R11 < 0.
461.
3. The induction motor according to claim 1, characterized in that, The width of the first magnetic tooth is W1, and the width of the second magnetic tooth is W2. The relationship between W1 and W2 is 0.6 < W2 / W1 < 0.
8.
4. The induction motor according to claim 1, characterized in that, The thickness of the first magnetic yoke is non-uniform, while 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≤(Y12+Y2) / Y11≤1.
6.
5. The induction motor according to claim 2, characterized in that, The total cross-sectional area of the heat dissipation channel is defined as Ss, in mm. 2 Ss satisfies: 20.3%×π×(R11) 2 -R2 2 )≤Ss≤28.2%×π×(R11 2 -R2 2 ).
6. The induction motor according to claim 2, characterized in that, The inner radius of the stator core is R12, and the thickness of the magnetic bridge is h, satisfying: 0.5×(R12-R2)≤h<R12-R2.
7. A scroll compressor, characterized in that, Including the induction motor as described in any one of claims 1-6.