Stator, motor, compressor and refrigeration equipment
By optimizing the stator slot structure and using aluminum windings, the problems of high resistance and local oversaturation of the magnetic field in single-phase asynchronous motors were solved, resulting in improved motor efficiency and reduced costs.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-04
- Publication Date
- 2026-03-27
AI Technical Summary
Single-phase asynchronous motors have high resistance and winding losses due to the use of aluminum wire, resulting in low motor efficiency. Furthermore, the stator tangential current-passing design faces the challenge of localized excessive saturation of the magnetic field.
The stator slot structure is designed, aluminum windings are used, and the shape and number of the cutting grooves are optimized by adjusting the size range of the stator core K
It reduces stator winding losses, improves motor efficiency, reduces local oversaturation of the magnetic field, and lowers manufacturing difficulty and cost.
Smart Images
Figure CN224053959U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to the technical field of refrigeration equipment, in particular to a kind of stator, motor, compressor and refrigeration equipment. BACKGROUND
[0002] Single-phase induction motor is simple in structure, and energy efficiency is higher, so it is widely used in household appliances such as air conditioner. With the increasingly fierce market competition, the cost and energy efficiency of single-phase asynchronous motor are required higher and higher, in order to greatly reduce the cost of single-phase asynchronous motor, aluminum wire is used instead of copper wire, because the resistivity of aluminum wire is 1.6 times of copper wire, which leads to larger resistance of aluminum wire motor, larger winding loss, and lower motor efficiency, so the motor lamination needs to be redesigned, and the winding loss and iron loss of aluminum wire motor are reasonably allocated to improve the efficiency of the motor. Increase the slot area to increase the diameter of the aluminum wire, thereby reducing the resistance and reducing the winding loss. However, the slot area is increased, the stator yoke is narrowed, and the challenge of through-flow design of stator cutting edge is brought, so the cutting edge and cutting edge groove size need to be reasonably designed to reduce the local excessive saturation of magnetic field under the condition of ensuring the through-flow area. SUMMARY
[0003] The main purpose of the utility model is to provide a kind of stator, motor, compressor and refrigeration equipment, which aims to reduce the local excessive saturation of magnetic field.
[0004] To achieve the above object, the stator provided by the utility model comprises:
[0005] The stator core comprises a stator yoke and a plurality of stator teeth, two adjacent stator teeth and the stator yoke form a stator slot, the stator slot comprises at least one group of first stator slots and at least one group of second stator slots, each group of first stator slots comprises two first stator slots symmetrically arranged, each group of second stator slots comprises two second stator slots symmetrically arranged, the cross-sectional area of the first stator slot is larger than that of the second stator slot, and the outer peripheral wall of the stator yoke is provided with a cutting edge groove.
[0006] The stator winding is wound in the stator slot, and the material of the stator winding is aluminum.
[0007] Wherein, the number of the stator slot is Q, the bottom width of the cutting edge groove is L1, the maximum outer diameter of the stator core is D1, the inner diameter of the stator core is D5, the width of the stator tooth is K, the maximum distance between two symmetric points on the slot wall of each group of first stator slots is D3, the maximum distance between two symmetric points on the slot wall of each group of second stator slots is D4, K < L1 < D1 , 1.22 ≤ D3 / D4 ≤ 2. ≤ 2.
[0008] In one embodiment, the width of the tangential groove gradually increases toward the outer peripheral wall of the stator yoke.
[0009] In one embodiment, the cutting groove is provided in multiple sets, and each set of the cutting groove includes two symmetrically arranged cutting grooves. The minimum distance between two symmetrical points on the groove wall of each set of the cutting grooves is D2. The fillet radius at the bottom of the first stator groove is R, and the width at the opening of the cutting groove is L2. D1-D2 <L2-L1<2R。
[0010] In one embodiment, the cutting grooves are provided in multiple sets, and each set of cutting grooves includes two symmetrically arranged cutting grooves. The minimum distance between two symmetrical points on the groove wall of each set of cutting grooves is D2, where 0.9 ≤ ≤1.1.
[0011] In one embodiment, 0.15 ≤ ≤0.6.
[0012] In one embodiment, the stator is applied to a motor, the motor has P poles, and the outer peripheral surface of the stator yoke is provided with straight tangents, the number of which is 2P.
[0013] In one embodiment, the stator is applied to a motor, the motor having P poles and the number of the chamfered grooves being 4P.
[0014] This utility model also proposes an electric motor, including the stator as described above.
[0015] This utility model also proposes a compressor, including the motor described above.
[0016] This utility model also proposes a refrigeration device, including the compressor described above.
[0017] In this invention, the stator winding material is replaced with aluminum, thereby reducing the stator manufacturing cost compared to the copper stator windings used in the prior art. However, since aluminum stator windings have higher resistance than copper stator windings, this increases stator winding losses and reduces motor efficiency. Therefore, this invention limits the dimensions of the stator core to... K < L1 < 1.22≤ Within the range of ≤2, this reduces stator winding losses and iron losses, thereby improving motor efficiency. Among these, This represents the circumference of the circle formed by the bottom walls of multiple second stator slots. K represents the length of the bottom of a single second stator slot. L1, and L1< K, then the arc length of the outer circumferential wall of the stator yoke corresponding to the single stator slot is too small, which makes the thickness of the stator yoke in the radial direction locally too large, and thus the gas flow area is reduced, which is not conducive to the flow and reduces the efficiency of the whole machine. K, then the bottom width of the cut edge groove is too small, which makes the thickness of the stator yoke in the radial direction locally too large, and thus the gas flow area is reduced, which is not conducive to the flow and reduces the efficiency of the whole machine. And if L1≥ K, then the bottom width of the cut edge groove is too small, which makes the thickness of the stator yoke in the radial direction locally too large, and thus the gas flow area is reduced, which is not conducive to the flow and reduces the efficiency of the whole machine. And if L1≥ K < L1 < K, so as to improve the flow efficiency of the gas in the cut edge groove and reduce the local excessive saturation of the stator magnetic field, thereby improving the efficiency of the motor. Further, L1 < K, so as to improve the flow efficiency of the gas in the cut edge groove and reduce the local excessive saturation of the stator magnetic field, thereby improving the efficiency of the motor. Further, L1 < K, so as to improve the flow efficiency of the gas in the cut edge groove and reduce the local excessive saturation of the stator magnetic field, thereby improving the efficiency of the motor. Further, L1 < K, so as to improve the flow efficiency of the gas in the cut edge groove and reduce the local excessive saturation of the stator magnetic field, thereby improving the efficiency of the motor. Further, L1 < K, so as to improve the flow efficiency of the gas in the cut edge groove and reduce the local excessive saturation of the stator magnetic field, thereby improving the efficiency of the motor. Further, L1 < K, so as to improve the flow efficiency of the gas in the cut edge groove and reduce the local excessive saturation of the stator magnetic field, thereby improving the efficiency of the motor. Further, L1 < K, so as to improve the flow efficiency of the gas in the cut edge groove and reduce the local excessive saturation of the stator magnetic field, thereby improving the efficiency of the motor. Further, BRIEF DESCRIPTION OF DRAWINGS
[0018] In order to more clearly illustrate the technical scheme in the embodiments of the present application or the prior art, the drawings needed to be used in the following embodiment or prior art description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and those skilled in the art can also obtain other drawings according to the structures shown in these drawings without creative labor.
[0019] Figure 1 The structure schematic diagram of the stator core in the stator provided by the present application is shown in the figure.
[0020] Figure 2 The comparison diagram of the stator slot flow area between the original scheme of the prior art and the new scheme of the present application is shown in the figure.
[0021] Figure 3 The comparison diagram of the motor efficiency between the original scheme of the prior art and the new scheme of the present application is shown in the figure.
[0022] BRIEF DESCRIPTION OF DRAWINGS
[0023] 10, stator core; 11, stator yoke; 12, stator tooth; 13, stator slot; 131, first stator slot; 132, second stator slot; 14, undercut groove; 15, straight cut.
[0024] The realization, functional features and advantages of the utility model will be further described with reference to the embodiments and the accompanying drawings. DETAILED DESCRIPTION
[0025] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the utility model.
[0026] It should be noted that if the embodiments of the utility model 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 condition, etc. between the components in a certain specific posture, and if the specific posture changes, the directional indications also change accordingly.
[0027] In addition, if the embodiments of the utility model involve descriptions of "first", "second", etc., the descriptions of "first", "second", etc. are only for description purposes, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features with "first" and "second" can explicitly or implicitly include at least one of the features. In addition, "and / or" or "and / or" appearing throughout the text means that the three parallel schemes are included, for example, "A and / or B" includes A scheme, or B scheme, or A and B simultaneously satisfy the scheme. In addition, the technical solutions of each embodiment can be combined with each other, but it must be based on the realization of the ordinary skill in the art, and when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, and is not within the protection scope required by the utility model.
[0028] With reference to Figure 1 The utility model provides a kind of stator, comprising:
[0029] A stator core 10, the stator core 10 includes a stator yoke 11 and a plurality of stator teeth 12, two adjacent stator teeth 12 and the stator yoke 11 form a stator slot 13, the stator slot 13 includes at least one set of first stator slot 131 and at least one set of second stator slot 132, each set of first stator slot 131 includes two first stator slot 131 arranged symmetrically, each set of second stator slot 132 includes two second stator slot 132 arranged symmetrically, the cross-sectional area of the first stator slot 131 is greater than the cross-sectional area of the second stator slot 132, the outer wall of the stator yoke 11 is provided with a cut edge groove 14, and
[0030] A stator winding, the stator winding is wound in the stator slot 13, and the material of the stator winding is aluminum;
[0031] Wherein, the number of the stator slot 13 is Q, the bottom width of the cut edge groove 14 is L1, the maximum outer diameter of the stator core 10 is D1, the inner diameter of the stator core 10 is D5, the width of the stator tooth 12 is K, the maximum distance between the two symmetrical points on the slot wall of each set of first stator slot 131 is D3, and the maximum distance between the two symmetrical points on the slot wall of each set of second stator slot 132 is D4, K<L1< ,1.22≤ ≤2.
[0032] The technical scheme of the utility model discloses the material of stator winding is replaced to aluminum, thereby compared with the stator winding of copper quality in the prior art, the utility model technical scheme reduces the production cost of stator.And because the stator winding of aluminum quality is compared with the stator winding of copper quality resistance is greater, thereby increase the loss of stator winding, and then reduce the motor efficiency, therefore the utility model technical scheme limits each size of stator core 10 in K<L1< ,1.22≤ ≤2 range, thereby reduce the loss of stator winding and iron loss, and then improve the efficiency of motor. The length of the bottom wall of the plurality of second stator slots 132, K represents the length of the bottom of a single second stator slot 132, Then the arc length of the outer wall of the corresponding stator yoke 11 of a single stator slot 13 is represented, and if L1≤ K, it indicates that the bottom width of the cut edge groove 14 is too small, so that the thickness of the stator yoke 11 in the radial direction is locally too large, and the gas flow area is reduced, which is not conducive to the flow and reduces the overall efficiency. If L1≥ , which will cause the thickness of the stator core 10 in the radial direction to be too small in this area, thus causing the magnetic field in this area to be excessively saturated, which will reduce the efficiency of the motor. Therefore, by setting K < L1 < L2 , which will improve the flow efficiency of the gas in the cutout groove 14, reduce the local excessive saturation of the stator magnetic field, and improve the efficiency of the motor. Further, represents the depth of the first stator slot 131 in the radial direction of the stator core 10, represents the thickness of the stator yoke 11 in the radial direction at the first stator slot 131, if > 2, which means that the first stator slot 131 is too large, and the thickness of the corresponding stator yoke 11 at the first stator slot 131 is too small, thus causing the magnetic field in this area to be excessively saturated, which will reduce the efficiency of the motor. If < 1.22, which means that the first stator slot 131 is too small, which will cause the resistance loss of the stator winding to increase, and even cause the magnetic flux and output power to be insufficient. Please refer to Figure 2 and Figure 3 Therefore, by setting 1.22 ≤ ≤ 2, the area of the first stator slot 131 is increased, the resistance loss of the stator winding is reduced, and the thickness of the stator yoke 11 is also avoided from being too small, which reduces the local excessive saturation of the stator magnetic field, and thus improves the efficiency of the motor.
[0033] wherein the measurement method of K is as follows: the center point of one side wall of the stator tooth 12 in the width direction is selected as the starting point, and the center point of the other side wall of the stator tooth 12 in the width direction is selected as the end point, wherein the distance between the starting point and the end point is K.
[0034] D3 is the maximum distance between two symmetrical points on the slot wall of each group of first stator slots 131, therefore, the measurement method of D3 is twice the distance between the center point of the bottom wall of the first stator slot 131 and the center of the circle.
[0035] D4 is the maximum distance between two symmetrical points on the slot wall of each group of second stator slots 132, therefore, the measurement method of D4 is twice the distance between the center point of the bottom wall of the second stator slot 132 and the center of the circle.
[0036] The measurement method of L1 is as follows: the center point of one side length of the bottom wall of the cutout groove in the circumferential direction is selected as the starting point, and the center point of the other side length of the bottom wall of the cutout groove in the circumferential direction is selected as the end point, wherein the distance between the starting point and the end point is L1.
[0037] Further, 1.22 ≤ The range of ≤2 is large, thereby reducing the accuracy requirement in the production and processing of the stator core 10, and further reducing the production and manufacturing difficulty of the stator core 10, and further reducing the production and manufacturing cost of the stator core 10.
[0038] In an embodiment, the width of the edge cutting groove 14 gradually increases towards the direction close to the outer peripheral wall of the stator yoke 11, thereby reducing the difference between the thicknesses of the stator yoke 11 in the radial direction of the stator core 10, i.e., reducing the cases that the thickness of part of the stator yoke 11 is too large or too small, and further making the magnetic field distribution of the stator more uniform, and further improving the efficiency of the motor; reducing the magnetic field fluctuation, and further reducing the noise and vibration of the motor.
[0039] Specifically, the edge cutting groove 14 is provided in multiple groups, each group of the edge cutting groove 14 includes two symmetrically arranged edge cutting grooves 14, the minimum distance between the two symmetric points on the groove wall of each group of the edge cutting groove 14 is D2, the fillet of the bottom of the first stator slot 131 is R, the width of the opening of the edge cutting groove 14 is L2, and D1-D2
[0040] L2-L1<2R. Wherein, D1-D2 represents the slot depth of the edge cutting groove 14 in the radial direction of the stator core 10, it can be understood that if L2-L1≥2R, it means that the width of the opening of the edge cutting groove 14 is too large, and further easily leads to the thickness of part of the stator yoke 11 in the radial direction of the stator core 10 being too small, and further leads to the local excessive saturation of the stator magnetic field, and further reduces the efficiency of the motor. If L2-L1≤D1-D2, it means that the opening size change range of the edge cutting groove 14 is too small, thereby making the thickness of the stator yoke 11 in the radial direction be locally too large, and further the gas flow area will be small, which is not conducive to the flow, and reduces the overall efficiency.
[0040] Wherein, the measurement method of L2 is: taking the midpoint of the edge formed by the intersection between the groove wall on one side of the edge cutting groove 14 and the outer peripheral wall of the stator core 10 as the starting point, and taking the midpoint of the edge formed by the intersection between the groove wall on the other side of the edge cutting groove 14 and the outer peripheral wall of the stator core 10 as the end point, and measuring the distance between the starting point and the end point as L2.
[0041] In an embodiment, the edge cutting groove 14 is provided in multiple groups, each group of the edge cutting groove 14 includes two symmetrically arranged edge cutting grooves 14, the minimum distance between the two symmetric points on the groove wall of each group of the edge cutting groove 14 is D2, and 0.9≤D2 / L2≤1.1. Wherein, D1-D2 represents the slot depth of the edge cutting groove 14 in the radial direction of the stator core 10, and D2-L2 represents the height difference between the slot bottom of the first stator slot 131 and the slot bottom of the second stator slot 132 in the radial direction of the stator core 10. The ideal value of K should be exactly equal to 1, because in this way the thickness of the stator yoke 11 in the radial direction of the stator core 10 is kept consistent, so that the length of the magnetic field on the stator core 10 is more uniform, and thus the magnetic field distribution of the stator is more uniform, thereby improving the efficiency of the motor; reducing the magnetic field fluctuation, thereby reducing the noise and vibration of the motor. However, considering that there will inevitably be errors in the actual production and processing of the stator core 10, 0.9≤K≤1.1 is limited in this range, thereby reducing the production and manufacturing precision of the stator core 10, reducing the production and manufacturing difficulty of the stator core 10, and thus reducing the production and manufacturing cost of the stator core 10.
[0042] Specifically, 0.15≤K≤0.6, where K is the width of the stator tooth 12, and L1 is the bottom width of the undercut groove 14; if K>0.6, it means that the width of the stator tooth 12 is too large and / or the bottom of the undercut groove 14 is too small. If the width of the stator tooth 12 is too large, it will cause the area of the slot 13 to decrease, thereby increasing the resistance of the winding and the loss of the winding, reducing the efficiency and the maximum output power. If the bottom width of the undercut groove 14 is too small, it will cause the thickness of the stator yoke 11 in the radial direction to be locally too large, and thus the gas flow area will be smaller, which is not conducive to flow, reducing the overall efficiency. If K<0.15, it means that the width of the stator tooth 12 is too small and / or the bottom of the undercut groove 14 is too large. If the width of the stator tooth 12 is too small, it will cause the area of the stator slot 13 to decrease, thereby increasing the resistance loss of the stator winding, and even causing the magnetic flux and output power to be insufficient. If the bottom of the undercut groove 14 is too large, it will cause the thickness of part of the stator to be too small, thereby causing the local excessive saturation of the magnetic field of the stator yoke 11 at that location, thereby reducing the efficiency of the motor. Therefore, by limiting 0.15≤K≤0.6, the core of the motor is reduced, the local excessive saturation of the stator magnetic field is reduced, and thus the efficiency of the motor is improved. At the same time, by limiting 0.15≤K≤0.6, the production and manufacturing precision of the stator core 10 is reduced, the production and manufacturing difficulty of the stator core 10 is reduced, and thus the production and manufacturing cost of the stator core 10 is reduced.
[0043]
[0044] In an embodiment, the stator is applied to a motor, the motor has a pole number P, and the outer circumferential surface of the stator yoke 11 is provided with linear cut edges 15, and the number of the linear cut edges 15 is 2P. Through the linear cut edges 15, the electromagnetic performance of the motor can be improved, the magnetic resistance can be reduced, the magnetic flux density can be improved, the local excessive saturation of the stator magnetic field can be reduced, and thus the efficiency of the motor is improved. Meanwhile, the linear cut edges 15 can facilitate the installation of the stator and play a positioning role.
[0045] In an embodiment, the stator is applied to a motor, the motor has a pole number P, and the number of the cut edge grooves 14 is 4P. Through reasonable setting of the number of the cut edge grooves 14, the magnetic field distribution of the stator can be greatly optimized, the thickness of the stator yoke 11 in the radial direction of the stator core 10 is kept within a reasonable range, the local excessive saturation of the stator magnetic field is reduced, and the efficiency of the motor is improved.
[0046] The utility model also proposes a motor, the motor includes rotor and stator, the specific structure of the stator refers to the above embodiment, because the motor adopts all technical schemes of the above all embodiments, therefore at least has all beneficial effects brought by the technical scheme of the above embodiment, here will not repeat.
[0047] The utility model also proposes a compressor, the compressor includes motor, the specific structure of the motor refers to the above embodiment, because the compressor adopts all technical schemes of the above all embodiments, therefore at least has all beneficial effects brought by the technical scheme of the above embodiment, here will not repeat.
[0048] The utility model also proposes a refrigeration equipment, wherein, refrigeration equipment can divide into compression refrigeration equipment, absorption refrigeration equipment, vapor injection refrigeration equipment, heat pump refrigeration equipment and electric heating refrigeration device etc. Refrigeration equipment mainly includes motor, compressor, electronic expansion valve, evaporator, condenser and annex, pipeline. Such as refrigerator, air conditioner and so on. The specific structure of the electronic expansion valve refers to the above embodiment, because the refrigeration equipment in the utility model adopts all technical schemes of the above all embodiments, therefore at least has all beneficial effects brought by the technical scheme of the above embodiment, here will not repeat.
[0049] The above-mentioned is only the exemplary implementation of the utility model, and does not limit the patent range of the utility model, and any equivalent structural transformation made by using the utility model specification and drawing contents, or direct / indirect application in other related technical fields is included in the patent protection range of the utility model.
Claims
1. A stator characterized by, The stator comprises: a stator core comprising a stator yoke and a plurality of stator teeth, two adjacent stator teeth and the stator yoke enclosing a stator slot, the stator slot comprising at least one group of first stator slots and at least one group of second stator slots, each group of the first stator slots comprising two first stator slots symmetrically arranged, each group of the second stator slots comprising two second stator slots symmetrically arranged, the cross-sectional area of the first stator slot being larger than that of the second stator slot, and an undercut groove being provided on the outer circumferential wall of the stator yoke; and a stator winding wound in the stator slot, the material of the stator winding being aluminum. The number of the stator slots is Q, the bottom width of the trimmed groove is L1, the maximum outer diameter of the stator core is D1, the inner diameter of the stator core is D5, the width of the stator tooth is K, the maximum distance between two symmetrical points on the slot wall of each group of the first stator slots is D3, and the maximum distance between two symmetrical points on the slot wall of each group of the second stator slots is D4, 2. The stator of claim 1, wherein The width of the undercut groove gradually increases towards the direction close to the outer circumferential wall of the stator yoke.
3. The stator of claim 2, wherein The undercut groove is provided in multiple groups, each group of the undercut groove comprising two undercut grooves symmetrically arranged, the minimum distance between the two symmetric points on the groove wall of each group of the undercut groove being D2, the round angle at the bottom of the first stator slot being R, the width of the opening of the undercut groove being L2, and D1-D2<L2-L1<2R.
4. The stator of claim 1, wherein The trimming grooves are provided in multiple groups, each group of the trimming grooves includes two symmetrically arranged trimming grooves, and the minimum distance between two symmetric points on the groove wall of each group of the trimming grooves is D2, 5. The stator of claim 1, wherein 6. The stator of claim 1, wherein The stator is applied to an electric machine, the number of poles of the electric machine being P, and the outer circumferential surface of the stator yoke is provided with a linear undercut, the number of the linear undercut being 2P.
7. The stator of claim 1, wherein The stator is applied to an electric machine, the number of poles of the electric machine being P, and the number of the undercut groove is 4P.
8. An electric machine characterized by The electric machine comprises a rotor and the stator as claimed in any one of claims 1 to 7.
9. A compressor characterized by, The compressor comprises the electric machine as claimed in claim 8.
10. A refrigeration appliance characterized in that, The compressor comprises the electric machine as claimed in claim 9.