Stator and motor
By using three-phase stator windings in the motor design, each phase is equipped with multiple branches and concentric coils, the problem that the double-layer winding cannot adjust the voltage under the size limitation is solved, and small-amplitude voltage regulation and closer are achieved The electromagnetic waveform of the sinusoidal simultaneously reduces the winding span and the stator end size.
Patent Information
- Application Number
- CN202420513803.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-03-15
- Publication Date
- 2025-02-25
- Estimated Expiration
- 2034-03-15
AI Technical Summary
In the existing motor design, the double-layer winding cannot flexibly adjust the voltage under the size limitation, and the winding span is too large, resulting in too large stator end size, which cannot adjust the voltage slightly during the design stage and generate electromagnetic waves that are closer to sinusoidal. shape.
Three-phase stator windings are used, and each phase is equipped with n branches. Each branch includes m concentric coils and electrically connected in series. The turns of the coils are a, b,..., z respectively, which meets the specific number of turns. relationship to achieve a small amplitude adjustment of voltage and reduce winding span.
While adjusting the voltage slightly in the design stage, an electromagnetic waveform that is closer to sinusoidal is generated, and the stator end size is reduced, avoiding space waste caused by excessive winding span.
Smart Images
Figure CN222531405U_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the field of motor technology, and in particular to a stator and a motor. Background Art
[0002] At present, in the update and iteration of motor products, some types of motors have many restrictions in design due to the requirements of miniaturized products, such as permanent magnet synchronous motors used in compressors. Therefore, most motors generally use double-layer windings to make the electromagnetic waveform closer to sine. However, based on the above design premise, on the one hand, the double-layer winding cannot adjust the voltage more flexibly to meet the motor voltage design under the condition of size limitation. Specifically, in the motor design process, it is often the case that the size can no longer be changed and only the number of turns can be changed. However, increasing the number of turns exceeds the voltage that can be provided, and reducing the number of turns cannot fully utilize the voltage. On the other hand, after the double-layer winding design, the span of the winding is too large, resulting in a waste of copper wire and end space, which leads to an oversized stator end size. Utility Model Content
[0003] In view of this, the present application provides a stator and a motor to solve the problem that the winding span of the stator winding method in the prior art is too large and the voltage cannot be adjusted slightly during the design stage while generating an electromagnetic waveform that is closer to a sinusoidal waveform.
[0004] In order to achieve the above objectives, this application provides the following technical solutions:
[0005] A stator comprises a stator core and a stator winding, wherein the stator core is provided with stator slots, and the stator winding is three-phase and wound in the stator slots;
[0006] In the stator winding, each phase is provided with n branches, each branch includes m coils arranged concentrically and electrically connected in series, in each branch, the spans of all the coils gradually increase, and the number of turns of all the coils are respectively a, b, ..., z;
[0007] a, b, ..., z satisfy a*(m+1)<a+b+...+z<(a+1)*(m+1), a, b, ..., z are all positive integers, m is a positive odd number greater than or equal to 3, and n is a positive integer greater than or equal to 1.
[0008] Optionally, z is the maximum value among a, b, ..., z, and the sum of the number of turns of the coil accommodated in each stator slot is z.
[0009] Optionally, when m is 3, a, b and z satisfy a+b=z;
[0010] The sum of the number of turns of the coil accommodated in each stator slot is z.
[0011] Optionally, when m≥5, in each branch, the number of turns of all the coils are respectively a, b, c, ..., y, z, and a, b, c, y and z satisfy a+y=z, b+c=z;
[0012] The sum of the number of turns of the coil accommodated in each stator slot is z.
[0013] Optionally, the number of stator slots is 24, and when a=4, m=3, b=5, and z=9.
[0014] Optionally, in each of the branches, the spans of all the coils are 7 slots, 9 slots, and 11 slots respectively.
[0015] Optional, n is 2.
[0016] Optionally, the number of slots of the stator is 24, m=3, a=5, b=5, z=10;
[0017] In each of the branches, the spans of all the coils are 7 slots, 9 slots, and 11 slots respectively.
[0018] Optionally, the number of slots of the stator is 36, m=5, a=4, b=5, c=4, y=5, z=9;
[0019] In each of the branches, the spans of all the coils are 10 slots, 12 slots, 14 slots, 16 slots, and 18 slots, respectively.
[0020] A motor comprises the stator described in any one of the above items.
[0021] The stator provided in the present application includes a stator core and a stator winding, the stator core is provided with stator slots, the stator winding is three-phase and is wound in the stator slots; in the stator winding, each phase is provided with n branches, each branch includes m coils which are concentrically arranged and electrically connected in series, in each branch, the span of all coils increases gradually, and the number of turns of all coils are a, b, ..., z respectively; a, b, ..., z satisfy a*(m+1)<a+b+...+z<(a+1)*(m+1), a, b, ..., z are all positive integers, m is a positive odd number greater than or equal to 3, and n is a positive integer greater than or equal to 1. With such a configuration, when the traditional double-layer winding method in the prior art is used and the design voltage cannot be slightly reduced by reducing the number of coil turns, the stator winding provided by the present application is used, and according to the existing double-layer winding method, the number of coils in each branch of the stator double-layer winding closest to the target design voltage is determined to be m+1, and the number of turns of each coil is a+1, and then the number of coils in each branch is designed to be m, and the m coils have different numbers of turns, so that the total number of coil turns of a single branch is determined to be a+b+…+z, and a*(m+1)<a+b+…+z<(a+1)*(m+1) is achieved. In comparison, in the double-layer winding design, even if the number of turns of each coil differs by one, the total number of turns of a single branch will be greatly changed, and the total number of turns of a single branch of the stator winding of the present application can be between the above-mentioned number of turns changes, so as to obtain a slightly adjusted target design voltage. By avoiding the shortcomings of double-layer winding that the voltage can only be adjusted by changing the coils in pairs and the number of turns can be increased or decreased greatly, the adjustment range of the number of turns of a single branch can be reduced, which is conducive to obtaining a small increase or decrease in the design voltage, and it has been verified that it can produce an electromagnetic waveform that is closer to a sine wave. Not only that, while achieving a small adjustment of the design voltage, in the stator winding provided by the present application, the number of coils in a single branch can be reduced relative to the number of coils in a single branch of the conventional double-layer winding method, and the span is reduced accordingly. In this way, the coil circumference is long and the stator end size is too large due to the large span of the coil winding, which reduces the waste of copper wire and stator winding end space caused by the double-layer winding method commonly used in the prior art, and solves the problem that the stator winding method in the prior art has a large winding span and cannot adjust the voltage by a small amplitude in the design stage while taking into account the generation of an electromagnetic waveform that is closer to a sine wave. BRIEF DESCRIPTION OF THE DRAWINGS
[0022] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.
[0023] Figure 1It is a winding expansion diagram of a double-layer winding in the prior art;
[0024] Figure 2 A winding expansion diagram of a stator winding provided in an embodiment of the present application;
[0025] Figure 3 A three-phase voltage diagram of a motor in which the stator winding is provided in an embodiment of the present application. DETAILED DESCRIPTION
[0026] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.
[0027] The embodiment of the present application provides a stator, including a stator core and a stator winding, wherein the stator core is provided with stator slots, and the stator winding is three-phase and wound in the stator slots; in the stator winding, each phase is provided with n branches, each branch includes m coils arranged concentrically and electrically connected in series, in each branch, the spans of all coils gradually increase, and the number of turns of all coils are respectively a, b, ..., z; a, b, ..., z satisfy a*(m+1)<a+b+...+z<(a+1)*(m+1), a, b, ..., z are all positive integers, m is a positive odd number greater than or equal to 3, and n is a positive integer greater than or equal to 1. One or two coils are accommodated in a single stator slot. Generally speaking, a branch can also be referred to as a pole phase group.
[0028] With such a configuration, when the traditional double-layer winding method in the prior art is used and the design voltage cannot be slightly reduced by reducing the number of coil turns, the stator winding provided by the present application is used, and according to the existing double-layer winding method, the number of coils in each branch of the stator double-layer winding closest to the target design voltage is determined to be m+1, and the number of turns of each coil is a+1, and then the number of coils in each branch is designed to be m, and the m coils have different numbers of turns, so that the total number of coil turns of a single branch is determined to be a+b+…+z, and a*(m+1)<a+b+…+z<(a+1)*(m+1) is achieved. In comparison, in the double-layer winding design, even if the number of turns of each coil differs by one, the total number of turns of a single branch will be greatly changed, and the total number of turns of a single branch of the stator winding of the present application can be between the above-mentioned number of turns changes, so as to obtain a slightly adjusted target design voltage. By avoiding the shortcomings of double-layer winding that the voltage can only be adjusted by changing the coils in pairs and the number of turns can be increased or decreased greatly, the adjustment range of the number of turns of a single branch can be reduced, which is conducive to obtaining a small increase or decrease in the design voltage, and it has been verified that it can produce an electromagnetic waveform that is closer to a sine wave. Not only that, while achieving a small adjustment of the design voltage, in the stator winding provided by the present application, the number of coils in a single branch can be reduced relative to the number of coils in a single branch of the conventional double-layer winding method, and the span is reduced accordingly. In this way, the coil circumference is long and the stator end size is too large due to the large span of the coil winding, which reduces the waste of copper wire and stator winding end space caused by the double-layer winding method commonly used in the prior art, and solves the problem that the stator winding method in the prior art has a large winding span and cannot adjust the voltage by a small amplitude in the design stage while taking into account the generation of an electromagnetic waveform that is closer to a sine wave.
[0029] Specifically, in order to more quickly design the number of turns of the coil, z is the maximum value among a, b, ..., z, and the sum of the number of turns of the coil accommodated in each stator slot is z.
[0030] In a specific embodiment, when m is 3, a, b and z satisfy a+b=z; the sum of the number of turns of the coil accommodated in each stator slot is z. That is, part of the stator slots of the stator winding of the present application accommodate two coils of different phases, and the remaining stator slots accommodate one coil.
[0031] In another specific embodiment, when m≥5, the number of turns of the coil in each branch is a, b, c, ..., y, z respectively, a, b, c, y and z satisfy a+y=z, b+c=z; the sum of the number of turns of the coil accommodated in each stator slot is z. That is, part of the stator slots of the stator winding of the present application accommodate two coils of different phases, and the remaining stator slots accommodate one coil.
[0032] Regarding the number of stator slots, the design in the prior art can be used, such as 24 slots, 36 slots, 42 slots, 48 slots, 72 slots, etc.
[0033] In a specific embodiment, the number of stator slots is 24, and when a=4, m=3, b=5, z=9. It is suitable for the case where the double-layer winding is designed with 24 slots, a single branch has 4 coils, and each coil has 5 turns. For the double-layer winding expansion diagram, please refer to Figure 1 The total number of turns of a single branch is 20 turns. When the coil becomes 4 turns, based on the limitation of the double-layer winding, all coils need to be changed to 4 turns. At this time, the total number of turns of a single branch is 16 turns, and the voltage simply drops by 25% in proportion, which is a large amplitude. If the stator winding provided by the present application is used, a single branch has 3 coils, and the total number of turns of a single branch is 4+5+9=18 turns, which is between 16 turns and 20 turns, so that a small adjustment of the design voltage can be achieved, which is equivalent to reducing the proportion of a single-layer winding, and the voltage can be reduced by 12.5%.
[0034] In addition, since the number of coils is reduced, the spans of all coils in each branch are 7 slots, 9 slots, and 11 slots respectively. Compared with the coil spans of double-layer windings of 7 slots, 9 slots, 11 slots, and 13 slots, the span of a single branch is reduced.
[0035] Furthermore, n may be set to 2, and each phase is provided with two branches, or two pole-phase groups.
[0036] For the winding expansion diagram of the stator winding formed by the above-mentioned application, please refer to Figure 2 In phase A, all coils of one branch are wound in slots 4 to 15, slots 5 to 14, slots 6 to 13, and all coils of the other branch are wound in slots 16 to 3, slots 17 to 2, and slots 18 to 1; in phase B, all coils of one branch are wound in slots 24 to 11, slots 1 to 10, slots 2 to 9, and all coils of the other branch are wound in slots 12 to 23, slots 13 to 22, and slots 14 to 21; in phase C, all coils of one branch are wound in slots 8 to 19, slots 9 to 18, slots 10 to 17, and all coils of the other branch are wound in slots 20 to 7, slots 21 to 6, and slots 22 to 5. In addition, the three-phase voltage diagram is recorded, please refer to Figure 3 It can be seen that the stator winding of the present application is wound in this way to ensure the correct phase sequence of the three phases.
[0037] In addition, the comparison between the stator winding provided by the present application and the existing double-layer winding and single-layer winding methods is recorded through the test process to form a performance comparison, so as to further specifically illustrate the contents disclosed in the present application. These embodiments are only used for illustrative descriptions, because various modifications and changes within the scope of the contents disclosed in the present application are obvious to those skilled in the art.
[0038] The sine quality of electromagnetic waves is determined by the rotor eddy current loss. Under the premise of ensuring the same motor torque output, the comparative data of eddy current loss of different winding methods are shown in the following table:
[0039]
[0040]
[0041] From the data in the table, it can be seen that although the stator winding winding method of the present application increases the rotor eddy current loss by 13.99% compared with the existing double-layer winding winding method, the rotor eddy current loss is only 16.06% of the single-layer winding when meeting the demand for slightly adjusting the design voltage. It can be concluded that the stator winding winding method of the present application can not only adjust the voltage slightly in the design stage, but also produce an electromagnetic waveform that is closer to a sine wave, and has extremely high production feasibility. In the actual design and application process, it provides a performance-balanced option for voltage regulation design.
[0042] In another specific embodiment, the number of stator slots is 24, m=3, a=5, b=5, z=10. In this way, a single branch has 3 coils with 5, 5, and 10 turns, respectively, and the total number of turns of a single branch is 5+5+10=20 turns. In addition, since the number of coils is reduced, the spans of all coils in each branch are 7 slots, 9 slots, and 11 slots, respectively. Compared with the coil spans of the double-layer winding of 7 slots, 9 slots, 11 slots, and 13 slots, the span of a single branch is reduced.
[0043] In another specific embodiment, the number of stator slots is 36, a=4, b=5, c=4, y=5, z=9. In this configuration, a single branch has 5 coils, and the number of turns is 4, 5, 4, 5, 9 respectively, and the total number of turns of a single branch is 4+5+4+5+9=27 turns.
[0044] In addition, since the number of coils is reduced, the spans of all coils in each branch are 10 slots, 12 slots, 14 slots, 16 slots, and 18 slots respectively. Compared with the coil span of the double-layer winding, the span of a single branch is reduced.
[0045] Based on the above stator winding, the embodiment of the present application further provides a motor, which includes the above stator winding. Since the motor has the above stator winding, the beneficial effects of the motor brought by the stator winding can be found in the above content, which will not be repeated here.
[0046] The basic principles of the present application are described above in conjunction with specific embodiments. However, it should be noted that the advantages, strengths, effects, etc. mentioned in the present application are only examples and not limitations, and it cannot be considered that these advantages, strengths, effects, etc. are required by each embodiment of the present application. In addition, the specific details disclosed above are only for the purpose of illustration and ease of understanding, not for limitation, and the above details do not limit the present application to being implemented by adopting the above specific details.
[0047] The block diagrams of the devices, apparatuses, equipment, and systems involved in this application are only illustrative examples and are not intended to require or imply that they must be connected, arranged, and configured in the manner shown in the block diagram. As will be appreciated by those skilled in the art, these devices, apparatuses, equipment, and systems can be connected, arranged, and configured in any manner. Words such as "including", "comprising", "having", etc. are open words, referring to "including but not limited to", and can be used interchangeably with them. The words "or" and "and" used here refer to the words "and / or" and can be used interchangeably with them, unless the context clearly indicates otherwise. The words "such as" used here refer to the phrase "such as but not limited to", and can be used interchangeably with them.
[0048] It should also be noted that in the apparatus, device and method of the present application, each component or each step can be decomposed and / or recombined. Such decomposition and / or recombination should be regarded as equivalent solutions of the present application.
[0049] The above description of the disclosed aspects is provided to enable any person skilled in the art to make or use the present application. Various modifications to these aspects will be readily apparent to those skilled in the art, and the general principles defined herein may be applied to other aspects without departing from the scope of the present application. Therefore, the present application is not intended to be limited to the aspects shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.
[0050] It should be understood that the qualifiers "first", "second", "third", "fourth", "fifth" and "sixth" used in the description of the embodiments of the present application are only used to more clearly explain the technical solutions and cannot be used to limit the scope of protection of the present application.
[0051] The above description has been given for the purpose of illustration and description. In addition, this description is not intended to limit the embodiments of the present application to the forms disclosed herein. Although multiple example aspects and embodiments have been discussed above, those skilled in the art will recognize certain variations, modifications, changes, additions and sub-combinations thereof.
Claims
1. A stator, characterized in that: It comprises a stator core and a stator winding, wherein the stator core is provided with stator slots, and the stator winding is three-phase and wound in the stator slots; In the stator winding, each phase is provided with n branches, each branch includes m coils arranged concentrically and electrically connected in series, in each branch, the spans of all the coils gradually increase, and the number of turns of all the coils are respectively a, b, ..., z; a, b, ..., z satisfy a*(m+1)<a+b+...+z<(a+1)*(m+1), a, b, ..., z are all positive integers, m is a positive odd number greater than or equal to 3, and n is a positive integer greater than or equal to 1.
2. The stator according to claim 1, characterized in that: z is the maximum value among a, b, ..., z, and the sum of the number of turns of the coil accommodated in each stator slot is z.
3. The stator according to claim 1, characterized in that: When m is 3, a, b and z satisfy a+b=z; The sum of the number of turns of the coil accommodated in each stator slot is z.
4. The stator according to claim 1, characterized in that: When m≥5, in each branch, the number of turns of all the coils are a, b, c, ..., y, z respectively, and a, b, c, y and z satisfy a+y=z, b+c=z; The sum of the number of turns of the coil accommodated in each stator slot is z.
5. The stator according to claim 3, characterized in that: The number of the stator slots is 24, and when a=4, m=3, b=5, and z=9.
6. The stator according to claim 5, characterized in that: In each of the branches, the spans of all the coils are 7 slots, 9 slots, and 11 slots respectively.
7. The stator according to claim 5, characterized in that: n is 2.
8. The stator according to claim 3, characterized in that: The number of slots of the stator is 24, m=3, a=5, b=5, z=10; In each of the branches, the spans of all the coils are 7 slots, 9 slots, and 11 slots respectively.
9. The stator according to claim 4, characterized in that: The number of slots of the stator is 36, m=5, a=4, b=5, c=4, y=5, z=9; In each of the branches, the spans of all the coils are 10 slots, 12 slots, 14 slots, 16 slots, and 18 slots, respectively.
10. A motor, characterized in that: Comprising a stator as claimed in any one of claims 1 to 9.