Stator, motor, compressor and refrigeration appliance
By designing a multi-stage winding scheme with forward and reverse coil groups on the motor stator, the problems of difficult motor winding and wire damage were solved, thereby improving motor performance and reliability.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- GUANGDONG MEIZHI COMPRESSOR
- Filing Date
- 2025-08-27
- Publication Date
- 2026-06-02
AI Technical Summary
When adapting to voltage requirements in different regions, existing motors are difficult to wind using thick-diameter enameled wire. Furthermore, when two strands of enameled wire are wound together, they are prone to deformation and wire damage due to compression, which affects the motor's performance and reliability.
The stator design incorporates forward and reverse coil groups for each phase, which are wound clockwise and counterclockwise on the stator core, respectively. Two strands of enameled wire are wound in two stages to reduce wire damage. By rationally arranging the position of the coil start and the winding direction, the winding overlap height and end height are reduced, thereby lowering the resistance.
It effectively avoids extrusion damage to enameled wire, reduces wire damage defect rate, reduces costs, improves motor performance and reliability, and enhances motor efficiency.
Smart Images
Figure CN120728930B_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of compressor technology, and particularly to a stator, motor, compressor, and refrigeration equipment. Background Technology
[0002] To adapt to the voltage requirements of different regions, existing motors often require the use of thick-diameter enameled wire. However, winding this wire is difficult, so the industry often uses a two-strand enameled wire winding scheme. However, due to its low mechanical strength, enameled wire is easily deformed and damaged by compression during winding, which affects the performance and reliability of the motor. Summary of the Invention
[0003] The main objective of this invention is to provide a stator, motor, compressor, and refrigeration equipment that allows two enameled wires that originally needed to be wound simultaneously to be wound in two separate windings, thereby achieving the purpose of single-strand winding and reducing wire damage caused by compression during winding and embedding.
[0004] To achieve the above objectives, the stator proposed in this invention includes:
[0005] The stator core has multiple stator slots along its circumference;
[0006] A multi-phase winding is provided in the stator slot. Each phase winding includes a forward coil group and a reverse coil group. The forward coil group has a forward coil start end and a forward coil end end, and the reverse coil group has a reverse coil start end and a reverse coil end end.
[0007] Wherein, the first end of the forward coil and the first end of the reverse coil are provided in the same slot, or, the plurality of stator slots include a first stator slot with the first end of the forward coil and a second stator slot with the first end of the reverse coil, the first stator slot and the second stator slot are spaced apart by n stator slots, n=q-1, and 0<q≤2.
[0008] In one embodiment, the motor has p poles, and both the forward coil group and the reverse coil group include k sub-coils, where k = .
[0009] In one embodiment, the number of sub-coils in each phase winding is equal.
[0010] In one embodiment, the total number of turns in the two sets of coils of each phase winding is equal.
[0011] In one embodiment, the total length of the coils in the forward coil group and the reverse coil group are equal.
[0012] In one embodiment, the winding is a copper enameled wire winding or an aluminum enameled wire winding.
[0013] In one embodiment, the number of stator slots is Q, the number of phases of the motor is m, the number of poles is p, and q = .
[0014] In one embodiment, the multiphase winding is a three-phase winding, with the end of each phase winding connected to the beginning of another phase winding to form a closed triangular loop.
[0015] The present invention also proposes an electric motor comprising a stator as described above.
[0016] The present invention also proposes a compressor comprising the motor described above.
[0017] The present invention also proposes a refrigeration device, which includes a compressor as described above.
[0018] In the technical solution of this invention, the stator includes a multi-phase winding, wherein each phase winding includes a forward coil group and a reverse coil group. The forward coil group is wound on the stator core in a clockwise direction, and the reverse coil group is wound on the stator core in a counterclockwise direction. This allows the two enameled wires that originally needed to be wound simultaneously to be wound in two separate windings, achieving single-strand winding. This effectively avoids the extrusion damage to the enameled wire caused by the parallel winding of two strands, effectively reduces wire damage caused by extrusion during winding and winding, lowers the wire damage defect rate, and at the same time ensures the performance of the motor equipped with the stator.
[0019] The starting ends of the forward coil in the forward coil group and the starting ends of the reverse coil in the reverse coil group can be located in the same stator slot. Alternatively, the first stator slot with the starting end of the forward coil and the second stator slot with the starting end of the reverse coil can be spaced apart by n stator slots, satisfying n=q-1 and 0<q≤2. Combined with the different winding directions of the forward and reverse coil groups, this can reduce the stacking height of the windings in the stator slots and the height of the winding ends, thereby helping to reduce the coil length, lower costs, and reduce winding resistance, thus achieving the effect of cost reduction and efficiency improvement. Attached Figure Description
[0020] 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 only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.
[0021] Figure 1 A schematic diagram of the winding of the U-phase windings U1 and U2 coils in an embodiment of the stator provided by the present invention;
[0022] Figure 2A schematic diagram of the V-phase windings V1 and V2 coils of an embodiment of the stator provided by the present invention;
[0023] Figure 3 A schematic diagram of the winding of the W-phase windings W1 and W2 coils in an embodiment of the stator provided by the present invention;
[0024] Figure 4 A schematic diagram of the U, V, and W phase winding connections of an embodiment of the stator provided by the present invention;
[0025] Figure 5 A cross-sectional view of an embodiment of the motor provided by the present invention;
[0026] Figure 6 A cross-sectional view of an embodiment of the compressor provided by the present invention;
[0027] Figure 7 A comparison diagram showing the wire damage defect rate of an embodiment of the stator provided by the present invention and a conventional stator in the aluminum wire stator production process;
[0028] Figure 8 A comparison diagram showing the winding end height of an embodiment of the stator provided by the present invention and a conventional stator;
[0029] Figure 9 A comparison diagram showing the motor efficiency of an embodiment of the motor provided by the present invention and a conventional motor.
[0030] Explanation of icon numbers:
[0031] 1. Compressor; 100. Motor; 10. Stator; 11. Stator core; 111. Stator slot; 12. Winding; 121. U-phase winding; 122. V-phase winding; 123. W-phase winding; 13. Forward coil group; 131. Forward coil start end; 132. Forward coil end; 14. Reverse coil group; 141. Reverse coil start end; 142. Reverse coil end;
[0032] 20. Rotor; 21. Rotor core; 22. Permanent magnet; 30. Pump body components; 40. Casing.
[0033] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation
[0034] 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 a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.
[0035] It should be noted that if the embodiments of the present invention involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.
[0036] Furthermore, if the embodiments of this invention involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.
[0037] To adapt to the voltage requirements of different regions, existing motors often require the use of thick-diameter enameled wire. However, winding this wire is difficult, so the industry often uses a two-strand enameled wire winding scheme. However, due to its low mechanical strength, enameled wire is easily deformed and damaged by compression during winding, which affects the performance and reliability of the motor.
[0038] To solve this technical problem, the present invention proposes a stator 10.
[0039] Please see Figures 1 to 4 In one embodiment of the present invention, the stator 10 includes a stator core 11, and the stator core 11 is provided with a plurality of stator slots 111 along its circumference; a multiphase winding 12 is disposed in the stator slots 111, and each phase winding 12 includes a forward coil group 13 and a reverse coil group 14. The forward coil group 13 has a forward coil start end 131 and a forward coil end 132, and the reverse coil group 14 has a reverse coil start end 141 and a reverse coil end 142; wherein, the forward coil start end 131 and the reverse coil end 142 are... The first end 141 of the coil is provided with a common slot, or, among the multiple stator slots 111, there is a first stator slot 111 with the first end 131 of the positive coil and a second stator slot 111 with the first stator slot 111 and the second stator slot 111 are spaced apart by n stator slots 111, n=q-1, and 0<q≤2; in this way, the two enameled wires that originally needed to be wound at the same time can be wound in two separate times to achieve the purpose of single-strand winding, thereby reducing the wire damage caused by compression during winding and embedding.
[0040] In the technical solution of the present invention, the stator 10 includes a multi-phase winding 12, wherein each phase winding 12 includes a forward coil group 13 and a reverse coil group 14. The forward coil group 13 is wound on the stator core 11 in a clockwise direction, and the reverse coil group 14 is wound on the stator core 11 in a counterclockwise direction. This allows the two enameled wires that originally needed to be wound at the same time to be wound in two separate windings, achieving single-strand winding. This effectively avoids the extrusion damage to the enameled wire caused by the parallel winding of two strands, effectively reduces wire damage caused by extrusion during winding and winding, reduces the defect rate of wire damage, and at the same time ensures the performance of the motor 100 equipped with the stator 10.
[0041] The forward coil start-end 131 in the forward coil group 13 and the reverse coil start-end 141 in the reverse coil group 14 can be located in the same stator slot 111. Alternatively, the first stator slot 111 with the forward coil start-end 131 and the second stator slot 111 with the reverse coil start-end 141 can be spaced apart by n stator slots 111, satisfying n=q-1 and 0<q≤2. Combined with the different winding directions of the forward coil group 13 and the reverse coil group 14, this can reduce the stacking height of the winding 12 in the stator slot 111 and also reduce the height of the winding 12 end, thereby helping to reduce the coil length, reduce costs, and reduce the resistance of the winding 12, thus achieving the effect of cost reduction and efficiency improvement.
[0042] It should be noted that when q=2, n=1, and there is a gap of one stator slot 111 between the first stator slot 111 and the second stator slot 111; when q=1, n=0, there is a gap of zero stator slots 111 between the first stator slot 111 and the second stator slot 111, that is, the first stator slot 111 and the second stator slot 111 are arranged adjacent to each other.
[0043] Optionally, in an embodiment of the present invention, the multiphase winding 12 is a three-phase winding 12, with the end of each phase winding 12 connected to the beginning of another phase winding 12 to form a closed triangular circuit. This helps to reduce connection points and wiring complexity, lower the probability of wiring errors, and also makes the voltage and current distribution of each phase winding 12 more uniform, reducing three-phase imbalance, improving overall stability and reliability, and facilitating the improvement of motor 100 performance.
[0044] The three-phase winding 12 includes a U-phase winding 121, a V-phase winding 122, and a W-phase winding 123, as follows: Figure 1 As shown, the U-phase winding 121 includes a forward coil group 13 and a reverse coil group 14, that is, the forward coil group 13 is U1, the reverse coil group 14 is U2, and the beginning 131 of the forward coil of the forward coil group 13 is U11, the end 132 of the forward coil is U12, the beginning 141 of the reverse coil of the reverse coil group 14 is U21, and the end 142 of the reverse coil is U22.
[0045] like Figure 2 As shown, the V-phase winding 122 includes a forward coil group 13 and a reverse coil group 14, that is, the forward coil group 13 is V1, the reverse coil group 14 is V2, and the beginning 131 of the forward coil of the forward coil group 13 is V11 and the end 132 of the forward coil is V12, and the beginning 141 of the reverse coil of the reverse coil group 14 is V21 and the end 142 of the reverse coil is V22.
[0046] like Figure 3 As shown, the W-phase winding 123 includes a forward coil group 13 and a reverse coil group 14, that is, the forward coil group 13 is W1, the reverse coil group 14 is W2, and the forward coil start end 131 of the forward coil group 13 is W11 and the forward coil end 132 is W12, and the reverse coil start end 141 of the reverse coil group 14 is W21 and the reverse coil end 142 is W22.
[0047] like Figures 1 to 4 As shown, taking the forward coil start-up 131 and the reverse coil start-up 141 sharing a slot as an example, U11 and U21 are placed in slot 1, U12 in slot 4, and U22 in slot 16; V11 and V21 are placed in slot 3, V12 in slot 6, and V22 in slot 18; W11 and W21 are placed in slot 5, W12 in slot 8, and W22 in slot 2, that is, U11 (slot 1), U21 (slot 1), V12 (slot 6), and V22 (slot 18) are connected... Connect them together to form connection point 1, connect V11 (slot 3), V21 (slot 3), W12 (slot 8), and W22 (slot 2) together to form connection point 2, connect W11 (slot 5), W21 (slot 5), U12 (slot 4), and U22 (slot 16) together to form connection point 3. Connection points 1, 2, and 3 are the three vertices of a triangle and are respectively connected to the three phases (U, V, W) of the power supply, thus forming a closed triangular loop.
[0048] Since the forward coil start-up 131 and the reverse coil start-up 141 in each phase are located in the same stator slot 111 and form corresponding connection points, and the coils in the same phase have the same potential, there will be no current flow caused by potential difference. Therefore, the forward coil start-up 131 and the reverse coil start-up 141 can be isolated by a single wire end sleeve. This reduces the number of wire end sleeves, lowers costs, and helps to speed up production and improve efficiency. Of course, when the forward coil start-up 131 and the reverse coil start-up 141 are located in different stator slots 111, they can also be isolated by a single wire end sleeve.
[0049] Furthermore, the winding and wiring method of the present invention, such as Figure 8As shown, the height of the winding 12 end can be reduced, specifically to 95% of its original height. Reducing the height of the winding 12 end allows for a decrease in the amount of enameled wire used, lowering costs, while also reducing resistance and improving motor efficiency. Figure 9 As shown, the motor efficiency can be increased by 0.5% compared to the original motor efficiency.
[0050] Optionally, in an embodiment of the present invention, the number of stator slots 111 is Q, the number of phases of the motor 100 is m, the number of poles is p, and q = Where 0 < q ≤ 2, that is, 0 < ≤2, thus, the positions of the first end 131 of the forward coil and the first end 141 of the reverse coil on the stator core 11 can be set according to the different number of slots per phase and pole. In this way, by reasonably designing the distribution of the windings 12, the windings 12 are evenly distributed and the magnetic field is relatively evenly distributed, thereby ensuring the performance and reliability of the motor 100.
[0051] Specifically, when q=1, such as Figures 1 to 3 , Figure 5 As shown, motor 100 is a three-phase motor 100 with 18 slots and 6 poles, that is, the number of phases m=3, the number of stator slots 111 Q=18, and the number of poles p=6. In this case, the first end 131 of the forward coil and the first end 141 of the reverse coil are set in the same stator slot 111. When q=2, motor 100 can be a three-phase motor 100 with 24 slots and 4 poles, that is, the number of phases m=3, the number of stator slots 111 Q=24, and the number of poles p=4. In this case, the first end 131 of the forward coil is set in the first stator slot 111, and the first end 141 of the reverse coil is set in the second stator slot 111. The first stator slot 111 and the second stator slot 111 are arranged adjacent to each other or separated by one stator slot 111.
[0052] Optionally, in an embodiment of the present invention, the motor 100 has p poles, and both the forward coil group 13 and the reverse coil group 14 include k sub-coils, where k = And 0 < q ≤ 2, q = In this design, the sub-coils can be connected in series, which increases the total number of turns of the winding 12, thereby increasing the induced electromotive force of the winding 12 and minimizing the number of wire ends in the winding 12. It also facilitates a more uniform magnetic field through the distribution of the sub-coils, improving the efficiency and performance of the motor 100. However, this design is not limited to this; in other embodiments, the sub-coils can be connected in parallel.
[0053] Specifically, in the embodiments of the present invention, the number of sub-coils in each phase winding 12 is equal, which can optimize the magnetic circuit design, reduce leakage flux and losses, and improve the efficiency of the motor 100; it can also make the magnetic field distribution more uniform, while ensuring the balance of three-phase voltage and current, thereby improving the performance of the motor 100.
[0054] Optionally, in an embodiment of the present invention, the total number of turns of the two sets of coils of each phase winding 12 is equal, that is, the windings 12 of all phases (e.g., the U phase, V phase, and W phase mentioned above) have the same number of turns distribution, which can make each phase winding 12 consistent in electromagnetic characteristics. In other words, by precisely controlling the number of turns of each phase winding 12, a uniform distribution of magnetic field and a balance of electrical characteristics can be achieved, thereby ensuring that the motor 100 operates smoothly, efficiently and for a longer life, and improving the overall efficiency and performance of the motor 100.
[0055] In this design, the total number of turns in the two sets of coils of each phase winding 12 is even, which facilitates the winding of the winding 12 and allows for better planning of the coil arrangement within the stator slots 111. This fully utilizes the space within the stator slots 111, reduces the gap between coils, lowers the resistance of the winding 12, and also facilitates heat dissipation. Furthermore, it improves the symmetry of the multi-phase windings 12, ensuring multi-phase current balance and uniform magnetic field distribution, thereby improving the overall efficiency and performance of the motor 100. However, this design is not limited to this; in other embodiments, the total number of turns in the two sets of coils of each phase winding 12 can be odd.
[0056] Optionally, in embodiments of the present invention, the total lengths of the forward coil group 13 and the reverse coil group 14 are equal. This ensures that the resistances of the forward coil group 13 and the reverse coil group 14 are consistent, thereby guaranteeing a uniform current distribution in the winding 12; it also ensures the symmetry and uniformity of the magnetic field distribution, thereby improving the performance and reliability of the motor 100; and it simplifies the winding process of the winding 12, allowing workers to use standard winding tools and methods, improving production efficiency and reducing errors. The total coil length = number of turns × single-turn length, where the single-turn length is the length of the wire wrapped in one loop.
[0057] Optionally, in an embodiment of the present invention, the winding 12 is a copper enameled wire winding 12 or an aluminum enameled wire winding 12, so as to select the appropriate enameled wire winding 12 according to the application scenario and performance requirements of the motor 100.
[0058] Specifically, when the winding 12 is a copper enameled wire winding 12, the resistance of copper enameled wire is lower than that of aluminum enameled wire under the same cross-sectional area and length, which can significantly reduce copper loss and improve the overall efficiency of motor 100; and because copper has high mechanical strength, copper enameled wire is not easy to break during the winding process, ensuring the stability and reliability of copper enameled wire winding 12.
[0059] When winding 12 is an aluminum enameled wire winding 12, since aluminum enameled wire of the same volume is lighter than copper enameled wire, the overall weight of motor 100 can be reduced and the energy efficiency ratio can be improved; and the price of aluminum is lower than that of copper, which can make the cost of aluminum enameled wire lower.
[0060] Regarding the aforementioned winding and wiring methods, the two enameled wires that originally needed to be wound simultaneously are wound in two separate stages, achieving the purpose of single-strand winding. This reduces wire damage caused by compression during the winding and embedding process, and is particularly beneficial for the production of stators using softer aluminum enameled wires. Figure 7 As shown, the defect rate of wire damage in the aluminum wire production process can be less than or equal to 50% of the defect rate of conventional winding 12.
[0061] The present invention also proposes an electric motor 100, which includes a stator 10. The specific structure of the stator 10 is as described in the above embodiments. Since the electric motor 100 adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here. The electric motor 100 includes a stator 10 and a rotor 20. The rotor 20 includes a rotor core 21 disposed inside the stator 10 and a permanent magnet 22 disposed on the rotor core 21.
[0062] The present invention also proposes a compressor 1, which includes a motor 100. The specific structure of the motor 100 is as described in the above embodiments. Since the compressor 1 adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here. The compressor 1 includes a housing 40, and a stator 10, a rotor 20 disposed inside the stator 10, and a pump body component 30 connected to the rotor 20 are disposed inside the housing 40.
[0063] The present invention also proposes a refrigeration device, which includes a compressor 1. The specific structure of the compressor 1 is as described in the above embodiments. Since the refrigeration device adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here.
[0064] The above description is merely an exemplary embodiment of the present invention and does not limit the scope of protection of the present invention. Any equivalent structural transformations made based on the technical concept of the present invention and the contents of the specification and drawings of the present invention, or direct / indirect applications in other related technical fields, are included within the scope of protection of the present invention.
Claims
1. A stator, used in an electric motor, characterized in that, include: The stator core has multiple stator slots along its circumference; A multi-phase winding is provided in the stator slot. Each phase winding includes a forward coil group and a reverse coil group. The forward coil group has a forward coil start end and a forward coil end, and the reverse coil group has a reverse coil start end and a reverse coil end. The forward coil group is wound in a clockwise direction on the stator core, and the reverse coil group is wound in a counterclockwise direction on the stator core. Furthermore, the forward coil group and the reverse coil group are each independently wound from a single strand of enameled wire. Among them, the plurality of stator slots include a first stator slot with the beginning end of the forward coil and a second stator slot with the beginning end of the reverse coil. The first stator slot and the second stator slot are spaced apart by n stator slots, n=q-1, and 0<q≤2. The motor has p poles, Q stator slots, and m phases. Both the forward coil group and the reverse coil group include k sub-coils, where k = ... , and q= ; The multiphase winding is a three-phase winding, with the end of each phase winding connected to the beginning of another phase winding to form a closed triangular loop.
2. The stator as described in claim 1, characterized in that, The number of sub-coils in each phase winding is equal.
3. The stator as described in claim 1, characterized in that, The total number of turns in the two sets of coils of each phase winding is equal.
4. The stator as described in claim 1, characterized in that, The total length of the coils in the forward coil group and the reverse coil group are equal.
5. The stator as described in claim 1, characterized in that, The winding is a copper enameled wire winding or an aluminum enameled wire winding.
6. An electric motor, characterized in that, Includes the stator as described in any one of claims 1 to 5.
7. A compressor, characterized in that, Includes the motor as described in claim 6.
8. A refrigeration device, characterized in that, Includes the compressor as described in claim 7.