Multi-branch concentrated winding stator assembly and motor
By designing a multi-branch coil unit distribution scheme in the centralized winding stator assembly, the problem of inconcentration of lead wires and star dot lines is solved, and the motor process requirements are reduced and the winding structure design is simplified.
Patent Information
- Application Number
- CN202421223405.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-30
- Publication Date
- 2025-03-21
- Estimated Expiration
- 2034-05-30
AI Technical Summary
In the case of multiple branches, the lead wires and star dot lines are not concentrated, resulting in inconvenient winding structure design and high process requirements.
A multi-branch centralized winding stator assembly is designed. By setting Z stator teeth on the stator core and dividing them into N poles, each phase winding occupies B consecutive adjacent stator teeth in each pole, and each branch includes C coil units connected in series along the circumference of the stator core. Any two adjacent coil units connected in series in the same branch are distributed in two adjacent poles.
The uniform distribution of each branch coil unit is achieved, resulting in a centralized outgoing of lead-out lines and star-point lines, reducing the motor process requirements and simplifying the winding structure design.
Smart Images
Figure CN222654908U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of flat wire motors, and particularly relates to a multi-branch concentrated winding stator component and a motor. Background Art
[0002] At present, flat wire motor windings are mainly divided into centralized windings and distributed windings. Compared with distributed windings, centralized windings have simpler processes and lower costs. However, since the same branch of centralized windings is mostly wound in adjacent teeth, when a phase winding has multiple branches, the output lines of each branch are not concentrated, and the star point lines are scattered, which is not conducive to the design of the winding structure.
[0003] For example, when each phase winding has three branches, according to the existing adjacent tooth winding scheme, in order to achieve winding balance, each branch winding is arranged on a number of consecutive adjacent stator teeth, which is recorded as a multi-tooth winding unit. If the winding is divided into three poles, the three branch lead wires of each phase winding are centrally symmetrically distributed with respect to the axis of the stator core, and the deflection angle of any two lead wire positions is 120°; similarly, the three branch star point lines of each phase winding are centrally symmetrically distributed with respect to the axis of the stator core, and the deflection angle of any two star point line positions is 120°. At this time, the star point copper bar almost needs to span the entire winding end to achieve connection, which is not conducive to the overall structural design of the motor. Utility Model Content
[0004] In view of the above problems, the utility model provides a multi-branch concentrated winding stator assembly, the stator assembly comprising a stator core and a stator winding; the stator core is provided with Z stator teeth along its circumferential direction; wherein Z is an integer;
[0005] The stator winding is a three-phase winding, and each phase winding includes Y branches, where Y is an integer greater than or equal to 2;
[0006] Along the circumferential direction of the stator core, all stator teeth are equally divided into N poles, each pole includes A consecutive adjacent stator teeth, and each phase winding occupies B consecutive adjacent stator teeth in each pole; wherein A, B, and N are all integers, A=Z / N, and B=A / 3;
[0007] Each branch includes C coil units connected in series in the circumferential direction of the stator core, where C is an integer multiple of N; each coil unit includes a number of single coils connected in series in the radial direction of the stator core, and wound on each stator tooth in a spiral shape; any two adjacent series-connected coil units in the same branch are distributed in two adjacent poles;
[0008] Along the circumferential direction of the stator core, all coil units of each branch in the same phase winding are connected in series in the same direction; the star point lines of each branch of the same phase winding are located at the same pole and at the same end side of the stator winding; the lead-out lines of each branch of the same phase winding are located at the same pole and at the same end side of the stator winding.
[0009] Furthermore, each branch star point line of the winding of the same phase is connected from the stator slot close to the innermost or outermost layer of the stator core; each branch lead line of the winding of the same phase is connected from the stator slot close to the innermost or outermost layer of the stator core.
[0010] Furthermore, the stator core is provided with 27 stator teeth, which are divided into 3 poles, and each pole includes 9 consecutive adjacent stator teeth; the stator winding is a three-phase winding, and each phase winding includes 3 branches; each phase winding occupies 3 stator teeth in each stage; each branch includes 3 coil units connected in series in sequence along the circumferential direction of the stator core;
[0011] In one phase winding, the three coil units of the first branch are respectively wound on the first tooth of the first pole, the second tooth of the second pole and the third tooth of the third pole; the three coil units of the second branch are respectively wound on the second tooth of the first pole, the third tooth of the second pole and the first tooth of the third pole; the three coil units of the third branch are respectively wound on the third tooth of the first pole, the first tooth of the second pole and the second tooth of the third pole; the star point lines of the three branches are located at the same pole and at the same end side of the stator winding; the lead-out lines 3 of the three branches are located at the same pole and at the same end side of the stator winding.
[0012] Furthermore, in the winding of the same phase, the star point lines of the three branches all extend from the stator slots close to the outermost layer of the stator core; and the lead-out lines of the three branches all extend from the stator slots close to the innermost layer of the stator core.
[0013] The utility model also provides a multi-branch concentrated winding motor, which comprises the stator assembly mentioned above.
[0014] The beneficial effects of the utility model are:
[0015] In the stator winding provided by the embodiment of the utility model, the multiple coil units of each branch are evenly distributed in each stage, so that the lead-out wires and the star point wires are all centralized, reducing the motor process requirements.
[0016] Moreover, in the existing centralized winding scheme of winding multiple adjacent teeth, in order to achieve a balanced winding state, it is necessary to consider that each multi-tooth winding unit corresponding to each branch simultaneously reaches the same performance state, which places high demands on processability. In the utility model, any two adjacent series-connected coil units in the same branch are distributed in two adjacent poles, and only the performance state of a single coil unit needs to be considered to be the same, which places lower demands on processability for achieving a balanced winding state.
[0017] Other features and advantages of the utility model will be described in the following description, and partly become apparent from the description, or understood by implementing the utility model. The purpose and other advantages of the utility model can be realized and obtained by the structures indicated in the description and the drawings. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] In order to more clearly illustrate the embodiments of the utility model 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 some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.
[0019] Figure 1 A schematic diagram showing the structure of a coil unit in an embodiment of the utility model is shown;
[0020] Figure 2 A schematic diagram of winding connection of a stator assembly according to an embodiment of the utility model is shown.
[0021] In the figure: 1- stator teeth; 2- single coil; 3- lead wire; 4- star point line. DETAILED DESCRIPTION
[0022] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
[0023] The utility model provides a multi-branch concentrated winding motor, the motor comprising a stator assembly. The stator assembly comprises a stator core and a stator winding. The stator core is provided with Z stator teeth along its circumferential direction; wherein Z is an integer.
[0024] The stator winding is a three-phase winding, and each phase winding includes Y branches, where Y is an integer greater than or equal to 2.
[0025] Along the circumferential direction of the stator core, all stator teeth are equally divided into N poles, each pole includes A consecutive adjacent stator teeth, and each phase winding occupies B consecutive adjacent stator teeth in each pole; wherein A, B, and N are all integers, A=Z / N, and B=A / 3.
[0026] Each branch includes C coil units connected in series along the circumferential direction of the stator core, where C is an integer multiple of N; Figure 1 As shown, each coil unit includes a plurality of single coils 2 which are sequentially connected in series along the radial direction of the stator core and are spirally wound on each stator tooth 1; any two adjacent series-connected coil units in the same branch are distributed in two adjacent poles.
[0027] like Figure 2 As shown, along the circumferential direction of the stator core, all coil units of each branch in the same phase winding are connected in series in the same direction; the star point lines 4 of each branch of the same phase winding are located at the same pole and at the same end side of the stator winding; the lead-out lines 3 of each branch of the same phase winding are located at the same pole and at the same end side of the stator winding.
[0028] Furthermore, each branch star point line 4 of the same phase winding is connected from the stator slot close to the innermost or outermost layer of the stator core; each branch lead-out line 3 of the same phase winding is connected from the stator slot close to the innermost or outermost layer of the stator core.
[0029] In the stator winding provided by the embodiment of the utility model, the multiple coil units of each branch are evenly distributed in each stage, so that the lead-out wires and the star point wires are all centralized, reducing the motor process requirements.
[0030] Moreover, in the existing centralized winding scheme of winding multiple adjacent teeth, in order to achieve a balanced winding state, it is necessary to consider that each multi-tooth winding unit corresponding to each branch simultaneously reaches the same performance state, which places high demands on processability. In the utility model, any two adjacent series-connected coil units in the same branch are distributed in two adjacent poles, and only the performance state of a single coil unit needs to be considered to be the same, which places lower demands on processability for achieving a balanced winding state.
[0031] For example, Figure 2 As shown, the stator core is provided with Z=27 stator teeth, which are divided into N=3 poles, and each pole includes A=9 consecutive adjacent stator teeth; the stator winding is a three-phase winding, and each phase winding includes Y=3 branches; each phase winding occupies B=3 stator teeth in each stage; each branch includes C=3 coil units connected in series in sequence along the circumferential direction of the stator core.
[0032] like Figure 2 As shown, the arrangement of three branches of a phase winding is shown. For ease of understanding, three poles are defined clockwise from the star point line 4 to the lead line 3, namely the first pole, the second pole and the third pole. The three stator teeth occupied by the phase winding of each pole are defined as the first tooth, the second tooth and the third tooth in the clockwise direction.
[0033] In this phase winding, the three coil units of the first branch are respectively wound on the first tooth of the first pole, the second tooth of the second pole and the third tooth of the third pole; the three coil units of the second branch are respectively wound on the second tooth of the first pole, the third tooth of the second pole and the first tooth of the third pole; the three coil units of the third branch are respectively wound on the third tooth of the first pole, the first tooth of the second pole and the second tooth of the third pole.
[0034] The three branch star point lines 4 are located at the same pole and at the same end side of the stator winding; the three branch lead lines 3 are located at the same pole and at the same end side of the stator winding. In addition, the three branch star point lines 4 all come out from the stator slots close to the outermost layer of the stator core; the three branch lead lines 3 all come out from the stator slots close to the innermost layer of the stator core. Centralized lead-out is achieved.
[0035] In addition, each branch has only one coil winding set in each pole, as shown in Table 1, the specific winding path of the three-phase winding is symmetrically set, the resistance value of each branch of the three-phase winding is basically the same, and the inductance value of each branch is basically the same, so that the winding is balanced as a whole.
[0036] Table 1 Values of resistance and inductance of each branch
[0037]
[0038] Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims
1. A multi-branch concentrated winding stator assembly, characterized in that: The stator assembly includes a stator core and a stator winding; the stator core is provided with Z stator teeth along its circumferential direction; wherein Z is an integer; The stator winding is a three-phase winding, and each phase winding includes Y branches, where Y is an integer greater than or equal to 2; Along the circumferential direction of the stator core, all stator teeth are equally divided into N poles, each pole includes A consecutive adjacent stator teeth, and each phase winding occupies B consecutive adjacent stator teeth in each pole; wherein A, B, and N are all integers, A=Z / N, and B=A / 3; Each branch includes C coil units connected in series in the circumferential direction of the stator core, where C is an integer multiple of N; each coil unit includes a number of single coils connected in series in the radial direction of the stator core, and wound on each stator tooth in a spiral shape; any two adjacent series-connected coil units in the same branch are distributed in two adjacent poles; Along the circumferential direction of the stator core, all coil units of each branch in the same phase winding are connected in series in the same direction; the star point lines of each branch of the same phase winding are located at the same pole and at the same end side of the stator winding; the lead-out lines of each branch of the same phase winding are located at the same pole and at the same end side of the stator winding.
2. A multi-branch concentrated winding stator assembly according to claim 1, characterized in that: The star point lines of each branch of the winding of the same phase are all connected from the stator slot close to the innermost or outermost layer of the stator core; the lead-out lines of each branch of the winding of the same phase are all connected from the stator slot close to the innermost or outermost layer of the stator core.
3. A multi-branch concentrated winding stator assembly according to claim 1, characterized in that: The stator core is provided with 27 stator teeth, which are divided into 3 poles, and each pole includes 9 consecutive adjacent stator teeth; the stator winding is a three-phase winding, and each phase winding includes 3 branches; each phase winding occupies 3 stator teeth in each stage; each branch includes 3 coil units connected in series in sequence along the circumferential direction of the stator core; In one phase winding, the three coil units of the first branch are respectively wound on the first tooth of the first pole, the second tooth of the second pole and the third tooth of the third pole; the three coil units of the second branch are respectively wound on the second tooth of the first pole, the third tooth of the second pole and the first tooth of the third pole; the three coil units of the third branch are respectively wound on the third tooth of the first pole, the first tooth of the second pole and the second tooth of the third pole; the star point lines of the three branches are located at the same pole and at the same end side of the stator winding; the lead-out lines 3 of the three branches are located at the same pole and at the same end side of the stator winding.
4. A multi-branch concentrated winding stator assembly according to claim 3, characterized in that: In the winding of the same phase, the star point lines of the three branches all come out from the stator slots close to the outermost layer of the stator core; the lead-out lines of the three branches all come out from the stator slots close to the innermost layer of the stator core.
5. A multi-branch concentrated winding motor, characterized in that: The electric motor comprises the stator assembly according to any one of claims 1-4.