Stator of flat wire motor and flat wire motor
By designing a three-phase 8-pole flat wire winding, using the combined structure of I-shaped and U-shaped sub-conductors, the winding mode and conductor layout of the flat wire motor are optimized, and the problems of complex and poor versatility of the existing flat wire winding are solved, and the problem of complexity and poor versatility of the existing flat wire winding is realized. The simple winding and small end design of the flat wire motor improves the versatility and power density of the motor.
Patent Information
- Application Number
- CN202420750190.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-11
- Publication Date
- 2024-12-13
- Estimated Expiration
- 2034-04-11
AI Technical Summary
The 6-pole 48-slot 2-branch stator of the existing flat wire winding has a complex structure and poor versatility, making it difficult to achieve simple winding methods and small end sizes.
Design a flat wire motor stator including iron core and flat wire winding, adopts a three-phase 8-pole flat wire winding, and uses a combined structure of I-shaped and U-shaped subconductors to simplify winding through specific winding methods and welding pairing configurations. The wire process is optimized and the conductor layout is optimized in the winding troughs of each layer to achieve miniaturization and flexible motor design.
The winding method of flat wire motors is simplified, the end size is miniaturized, the versatility of the motor and the copper fullness are improved, and the power density of the motor is enhanced.
Smart Images
Figure CN222169442U_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the field of motors, and in particular to a stator of a flat wire motor using flat wires as windings. Background Art
[0002] Taking the motor of new energy vehicles as an example, the motor stator using flat wire as winding has a higher copper full rate, which can improve the power density of the motor.
[0003] There are various winding methods for flat wire windings. For a stator winding with 6 poles, 48 slots and 2 branches, the arrangement method in the prior art has a complex winding structure and poor versatility. Utility Model Content
[0004] The purpose of the present application is to overcome or at least alleviate the deficiencies of the above-mentioned prior art and to provide a stator of a flat wire motor and a flat wire motor.
[0005] According to a first aspect of the present application, a stator of a flat wire motor is provided, comprising an iron core and a flat wire winding, wherein the flat wire winding has a three-phase winding, the number of poles of the flat wire winding is 8, the number of winding slots of the iron core is 48, the flat wire winding of each phase comprises two branches, each branch comprises a plurality of sub-conductors, the sub-conductors comprise two I-shaped sub-conductors and a plurality of U-shaped sub-conductors, the two legs of the U-shaped sub-conductor are connected at one end to form a crown end, and are separated at the other end to form a welding end, the two I-shaped sub-conductors are respectively located at the incoming end and the outgoing end of each branch, wherein:
[0006] The inlet and outlet ends of the two branches are both located on the first layer. In the first layer, the two legs of the U-shaped sub-conductor are located on the same layer. The spans of the two U-shaped sub-conductors of each pole and each phase are 5 and 7 respectively. The spans of the U-shaped sub-conductors inserted into the remaining layers are all 6.
[0007] The number of layers formed by the flat wire winding in the winding slot is M, where M is an integer greater than 5. In the second layer to the M-1th layer, the two legs of the U-shaped sub-conductor are respectively located in two adjacent layers.
[0008] When M is an odd number, one leg of the U-shaped sub-conductor is inserted into the Mth layer and the other leg is located in the M-1th layer.
[0009] In the case where M is an even number, the U-shaped sub-conductor having one leg inserted into the Mth layer has the other leg also located in the Mth layer.
[0010] In at least one embodiment, when M is an odd number, the sub-conductors occupy two consecutive winding slots in each pole and each phase.
[0011] In at least one embodiment, when M is an even number, in each pole and each phase, the sub-conductor occupies two consecutive winding slots or the sub-conductor extends into three consecutive winding slots.
[0012] In at least one embodiment, when M is an even number, in each pole and each phase, the slots into which the legs of the sub-conductors are inserted are the 6*N+K slots, the 6*N+K-1 slots and the 6*N+K+1 slots, wherein the 6*N+K slot is occupied as a whole, the 6*N+K-1 slots and the 6*N+K+1 slots occupy the radially outer half and the radially inner half, respectively, or the 6*N+K-1 slots and the 6*N+K+1 slots occupy the radially inner half and the radially outer half, respectively, and N=0,1,2,3,4,5,6,7, and K is selected from any integer from 2 to 7.
[0013] In at least one embodiment, adjacent legs of two adjacent U-shaped sub-conductors welded together form a welded pair, and each welded pair has a span of 6.
[0014] In at least one embodiment, adjacent legs of two adjacent U-shaped sub-conductors welded together form a welded pair, the welded pairs whose legs are located at the M / 2th layer and the M / 2+1th layer respectively have a span of 7, and the spans of the remaining welded pairs are 6.
[0015] In at least one embodiment, the routing of each branch extends toward the same circumferential direction toward adjacent poles and toward the same radial direction toward adjacent layers until encountering the first layer or the Mth layer. If there are no vacant slots to be filled in the original extension direction, the direction of circumferential extension and radial extension is changed.
[0016] In at least one embodiment, the number of legs provided in each layer of the flat wire winding of each branch is equal, and the number of legs provided in each pole of the flat wire winding of each branch is equal.
[0017] In at least one embodiment, the two branches are connected in parallel, or the two branches are connected in series.
[0018] According to a second aspect of the present application, a flat wire motor is provided, comprising the stator of the flat wire motor according to the first aspect of the present application.
[0019] The winding method of the stator of the flat wire motor according to the present application can be applied to winding slots of various layers, the winding method is simple, and the size of the end winding is small. BRIEF DESCRIPTION OF THE DRAWINGS
[0020] Figure 1 is a schematic diagram of a stator of a flat wire motor according to a first embodiment of the present application.
[0021] Figure 2 It is a schematic diagram of the wiring sequence of one phase winding of the stator of the flat wire motor according to the first embodiment of the present application.
[0022] Figure 3 yes Figure 2 A schematic diagram showing the branching route.
[0023] Figure 4 It is a schematic diagram showing the wiring sequence of a branch circuit of one phase winding of a stator of a flat wire motor according to the second embodiment of the present application.
[0024] Figure 5 It is a schematic diagram showing the wiring sequence of a branch circuit of one phase winding of a stator of a flat wire motor according to a third embodiment of the present application.
[0025] Description of reference numerals:
[0026] S is iron core; W is winding; B is busbar. DETAILED DESCRIPTION
[0027] The exemplary embodiments of the present application are described below with reference to the accompanying drawings. It should be understood that these specific descriptions are only used to teach those skilled in the art how to implement the present application, and are not intended to exhaust all possible methods of the present application, nor to limit the scope of the present application.
[0028] First embodiment
[0029] Reference Figures 1 to 3 The stator of the flat wire motor according to the first embodiment of the present application (hereinafter referred to as the stator) includes an iron core S, a winding W and a bus bar B. The winding W is inserted into a winding slot (hereinafter referred to as a slot) of the iron core S. The bus bar B is used to connect the three-phase windings together to form a star point connection or a delta connection.
[0030] The winding W includes three phases, the number of poles of the winding is 8, the number of winding slots of the core S is 48, and the winding of each phase includes 2 branches. Each branch includes multiple sub-conductors, specifically, the sub-conductor of each branch includes 2 I-shaped sub-conductors and multiple U-shaped sub-conductors. The two legs of the U-shaped sub-conductor are connected at one end to form a crown end and separated at the other end to form a welding end. The two I-shaped sub-conductors are respectively located at the incoming end and the outgoing end of each branch. The outgoing end and the incoming end are located at two adjacent poles, and those skilled in the art can deduce that the outgoing end and the incoming end of the remaining two phases can also be located in the slots corresponding to the two adjacent poles. This allows the copper bar and bus bar B used at the winding end of the stator to have a very small size in the circumferential direction.
[0031] Reference Figure 2 , the winding in this embodiment forms 6 layers in the slot. Figure 2The winding routing sequence of one phase (e.g., U phase) is shown. It should be understood that the windings of the other two phases can be obtained by translating the U phase. For a single-phase winding, at each pole, the slots into which the winding is inserted are two adjacent full slots. For example, for the pole of slots 1 to 8, the slots into which the U phase winding is inserted are two adjacent slots, slots 3 and 4, and the entire slot 3 and the entire slot 4 are occupied by the U phase winding.
[0032] There are three types of U-shaped sub-conductors:
[0033] The first type of U-shaped sub-conductor is a conductor of the same layer, and both legs thereof are located in the first layer. The span of this type of sub-conductor is 5 or 7. In each phase winding of the first layer, adjacent U-shaped sub-conductors are arranged in a concentric nested structure, that is, the U-shaped sub-conductor with a span of 7 surrounds the U-shaped sub-conductor with a span of 5. This concentric nested structure makes the radial dimension occupied by the crown end at this location smaller.
[0034] The second type of U-shaped sub-conductor is a cross-layer conductor, whose two legs are located at the 2nd and 3rd layers, or at the 4th and 5th layers respectively. The span of this type of sub-conductor is 6.
[0035] The third type of U-shaped sub-conductor is a same-layer conductor, both legs of which are located at the 6th layer, and the span of this type of sub-conductor is 6.
[0036] The two codes enclosed in parentheses represent a U-shaped sub-conductor, for example Figure 4 The U-shaped sub-conductor pointing from A2 to A3 is represented as (21L2-27L3), wherein 21L2 indicates that the first leg of the U-shaped sub-conductor is located at the second layer of the slot 21, and 27L3 indicates that the second leg of the U-shaped sub-conductor is located at the third layer of the slot 27. The U-shaped sub-conductor can also be represented by A2→A3.
[0037] The routing sequence of each branch follows:
[0038] It extends circumferentially toward the first circumferential direction (e.g., clockwise) toward the adjacent pole, and radially toward the first radial direction (e.g., the direction of increasing number of layers). For example, the above-mentioned U-shaped sub-conductor (21L2-27L3) extends circumferentially toward the direction of increasing number of slots, and radially toward the direction of increasing number of layers. The U-shaped sub-conductor connected to A2→A3 is A4→A5, i.e. (33L2-27L3), and similarly, it extends circumferentially toward the direction of increasing number of slots, and radially toward the direction of increasing number of layers. Until it extends to the 1st or 6th layer, when continuing along the original extension direction will result in no vacant slots to be filled, the direction of circumferential extension and radial extension is changed. For example, for the U-shaped sub-conductor A18→A19 of the 6th layer, on the extension path before it, for example, observing the U-shaped sub-conductor A16→A17, the branch extension direction extends in the direction of increasing the number of layers and increasing the number of slots; on the extension path after the conductor A18→A19, for example, observing the U-shaped sub-conductor A20→A21, the branch extension direction extends in the direction of decreasing the number of layers and decreasing the number of slots.
[0039] In addition, observation Figure 2 It can be found that the number of legs of the flat wire winding of each branch in each layer is equal, and the number of legs of the flat wire winding of each branch in each pole is equal, and the magnetic circuit of the stator is symmetrical.
[0040] Figure 3 For clarity, Figure 2 The two branches of the U phase are shown separately, and the dotted lines in the figure indicate that the adjacent legs of the adjacent conductors are welded together, and the two legs are also referred to as forming a welded pair. In this embodiment, the span of each welded pair is 6.
[0041] The two branches can be connected in series or in parallel.
[0042] Second embodiment
[0043] Reference Figure 4 The second embodiment of the present application is introduced. The second embodiment is a modification of the first embodiment, and components having the same or similar structures or functions as those in the first embodiment are marked with the same reference numerals, and detailed descriptions of these components are omitted.
[0044] The main difference between this embodiment and the first embodiment is that each phase winding is inserted into three continuous slots instead of two adjacent full slots at each pole. And the first slot of these three continuous slots occupies half of the radial outer layer, the second slot is completely occupied, and the third slot occupies half of the radial inner layer. This is equivalent to dividing the two adjacent full slots in the first embodiment into two halves in the radial direction, and staggering the two parts by one slot in the circumferential direction.
[0045] More specifically, in this embodiment, the slots occupied by the legs of the conductor are the 6*N+K slot, the 6*N+K-1 slot, and the 6*N+K+1 slot. N=0,1,2,3,4,5,6,7; K is selected from any integer from 2 to 7. Among them, the 6*N+K slot is occupied as a whole, and the 6*N+K-1 slot and the 6*N+K+1 slot located on both sides of the 6*N+K slot in the circumferential direction occupy the radially outer half of the layers and the radially inner half of the layers, respectively. For example, in this embodiment, the 4th slot (i.e., the 6*0+4th slot) is occupied as a whole, the 3rd slot occupies the 1st, 2nd, and 3rd layers located in the radial outer side, and the 5th slot occupies the 4th, 5th, and 6th layers located in the radial inner side.
[0046] It should be understood that the direction of the above-mentioned misalignment can also be toward the other side in the circumferential direction, that is, the 6*N+K-1 groove and the 6*N+K+1 groove located on both sides of the 6*N+K groove in the circumferential direction occupy the radially inner half layer and the radially outer half layer respectively.
[0047] Another difference between this embodiment and the first embodiment is the span of the welding pairs: the welding pair connecting the legs located at the third layer and the fourth layer has a span of 7, and the span of the remaining welding pairs is 6.
[0048] Third embodiment
[0049] Reference Figure 5 The third embodiment of the present application is introduced. The third embodiment is a modification of the first embodiment, and components having the same or similar structures or functions as those in the first embodiment are marked with the same reference numerals, and detailed descriptions of these components are omitted.
[0050] The main difference between this embodiment and the first embodiment is that the winding in this embodiment forms 7 layers in the slot. In this embodiment, only the first layer is inserted with the same-layer conductor, and the U-shaped sub-conductors are inserted in two adjacent layers in the other layers.
[0051] It should be understood that the above-mentioned embodiments and some aspects or features thereof may be appropriately combined.
[0052] Of course, the present application is not limited to the above-mentioned embodiments, and those skilled in the art can make various modifications to the above-mentioned embodiments of the present application under the guidance of the present application without departing from the scope of the present application. For example:
[0053] (i) The first and second embodiments can be extended to windings of other even-numbered layers; the third embodiment can be extended to windings of other odd-numbered layers.
[0054] (ii) In the present application, the first layer may be the radially outermost layer or the radially innermost layer.
Claims
1. A stator of a flat wire motor, comprising an iron core and a flat wire winding, wherein the flat wire winding has a three-phase winding, the number of poles of the flat wire winding is 8, the number of winding slots of the iron core is 48, the flat wire winding of each phase comprises 2 branches, each branch comprises a plurality of sub-conductors, the sub-conductors comprise 2 I-shaped sub-conductors and a plurality of U-shaped sub-conductors, the two legs of the U-shaped sub-conductor are connected at one end to form a crown end, and are separated at the other end to form a welding end, the two I-shaped sub-conductors are respectively located at the inlet and outlet ends of each branch, characterized in that: The inlet and outlet ends of the two branches are both located on the first layer. In the first layer, the two legs of the U-shaped sub-conductor are located on the same layer. The spans of the two U-shaped sub-conductors of each pole and each phase are 5 and 7 respectively. The spans of the U-shaped sub-conductors inserted into the remaining layers are all 6. The number of layers formed by the flat wire winding in the winding slot is M, where M is an integer greater than 5. In the second layer to the M-1th layer, the two legs of the U-shaped sub-conductor are respectively located in two adjacent layers. When M is an odd number, one leg of the U-shaped sub-conductor is inserted into the Mth layer and the other leg is located in the M-1th layer. In the case where M is an even number, the U-shaped sub-conductor having one leg inserted into the Mth layer has the other leg also located in the Mth layer.
2. The stator of the flat wire motor according to claim 1, characterized in that: When M is an odd number, the sub-conductors occupy two consecutive winding slots per pole and per phase.
3. The stator of the flat wire motor according to claim 1, characterized in that: When M is an even number, in each pole and each phase, the sub-conductor occupies two consecutive winding slots or the sub-conductor extends into three consecutive winding slots.
4. The stator of the flat wire motor according to claim 1, characterized in that: When M is an even number, in each pole and each phase, the slots into which the legs of the sub-conductors are inserted are the 6*N+K slot, the 6*N+K-1 slot and the 6*N+K+1 slot, wherein the 6*N+K slot is occupied as a whole, the 6*N+K-1 slot and the 6*N+K+1 slot occupy the radially outer half and the radially inner half respectively, or the 6*N+K-1 slot and the 6*N+K+1 slot occupy the radially inner half and the radially outer half respectively, N=0,1,2,3,4,5,6,7, and K is selected from any integer from 2 to 7.
5. The stator of the flat wire motor according to claim 2 or 3, characterized in that: Adjacent legs of two adjacent U-shaped sub-conductors welded together form a welding pair, and each welding pair has a span of 6.
6. The stator of the flat wire motor according to claim 4, characterized in that: Adjacent legs of two adjacent U-shaped sub-conductors welded together form a welded pair. The span of the welded pairs whose legs are located at the M / 2th layer and the M / 2+1th layer respectively is 7, and the span of the remaining welded pairs is 6.
7. The stator of the flat wire motor according to claim 1, characterized in that: The routing of each branch extends toward the adjacent pole in the same circumferential direction and toward the adjacent layer in the same radial direction until it encounters the first layer or the Mth layer. When there are no free slots to be filled in the original extension direction, the direction of the circumferential extension and the radial extension is changed.
8. The stator of the flat wire motor according to claim 1, characterized in that: The number of legs of the flat wire winding of each branch in each layer is equal, and the number of legs of the flat wire winding of each branch in each pole is equal.
9. The stator of the flat wire motor according to any one of claims 1 to 8, characterized in that: The two branches are connected in parallel, or the two branches are connected in series.
10. A flat wire motor, characterized in that: A stator comprising the flat wire motor according to any one of claims 1 to 9.