Stator for a flat wire motor
By designing the number of winding slots per pole and per phase in the stator of the flat wire motor to be 3, and the number of poles to be an even multiple of 3, and by adopting flat wire stator windings with specific spans and staggered arrangements, the problems of complex windings and large space occupation in the prior art are solved, and a simple, low-cost, high-performance motor structure is realized.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- BLUE SKY ELECTRIC DRIVE TECH (JIANGSU) CO LTD
- Filing Date
- 2023-02-17
- Publication Date
- 2026-07-03
AI Technical Summary
In the existing technology, the arrangement of flat wire windings is complicated, especially for flat wire windings with 3 slots per pole per phase, 2P poles that are an even multiple of 3, and 2 branches connected in parallel. The large spacing between the output terminals leads to a complicated busbar arrangement and the large space occupied by the windings, which restricts the installation of the rotor.
Design a stator structure for a flat wire motor. The number of winding slots per pole per phase is 3, the number of stator poles is an even multiple of 3, and the number of layers formed by the flat wire stator winding in the winding slots is 2M, where M is an odd number. A three-phase winding is adopted, with each phase including 2 parallel branches. Each branch consists of multiple U-shaped sub-conductors connected in series. The span of the conductor group is arranged according to a specific rule. The sub-conductors span two adjacent layers and are staggered in slot positions. The output terminal and lead terminal are located in the innermost and outermost radial layers.
This design achieves a simple winding structure, low cost, reduced harmonic interference, and improved motor performance and rotor installation flexibility.
Smart Images
Figure CN116317264B_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of electric motors, and more specifically to a stator for a flat wire motor that uses flat wire as windings. Background Technology
[0002] Taking the motors of new energy vehicles as an example, motor stators that use flat wires as windings have a higher copper fill factor, which can improve the power density of the motor.
[0003] However, flat wire windings are less flexible in terms of arrangement compared to round wire windings. How to arrange flat wire windings according to the needs of various motor performance characteristics, so as to make the winding structure simple, the manufacturing cost low, and the motor have better working performance (such as less harmonic interference), is an urgent problem to be solved in this field.
[0004] Especially for flat wire windings with q per pole per phase as the number of slots, 2P as an even multiple of 3, and 2 branches connected in parallel, the existing winding methods are complex. For example, the output ends of each branch are spaced far apart in the circumferential direction of the stator (even up to 180°), making the busbar arrangement complex; or the space occupied by one end of the winding is large, which limits the installation of the rotor. Summary of the Invention
[0005] The purpose of this invention is to overcome or at least mitigate the shortcomings of the prior art and to provide a stator for a flat wire motor.
[0006] This invention provides a stator for a flat wire motor, comprising a stator core and flat wire stator windings, wherein,
[0007] The stator has 3 winding slots per pole per phase, the stator has an even multiple of 3 poles, and the flat wire stator windings form 2M layers within the winding slots, where M is an odd number greater than 2.
[0008] The flat wire stator winding includes a three-phase winding. Each phase of the flat wire stator winding includes two parallel branches. Each branch is formed by multiple U-shaped sub-conductors connected in series.
[0009] Each phase of the flat wire stator winding includes multiple first conductor groups and multiple second conductor groups. The first conductor group includes three sub-conductors, namely a first conductor, a second conductor, and a third conductor.
[0010] The second conductor group includes three sub-conductors, namely a second conductor, a third conductor, and a fourth conductor, or a first conductor, a second conductor, and a fifth conductor.
[0011] The span of the first conductor is K+1, the span of the second conductor is K, the span of the third conductor is K-1, the span of the fourth conductor is K-2, and the span of the fifth conductor is K+2, where K is a positive integer.
[0012] Each of the sub-conductors spans two adjacent layers, namely the 2Nth layer and the 2N-1th layer, where N is a positive integer.
[0013] The second conductor group is disposed in the Mth layer and the (M+1)th layer, and the first conductor group is disposed in all layers except the Mth layer and the (M+1)th layer.
[0014] The slots occupied by the sub-conductors are located in M layers on the radially inner side, with each pole and each phase occupying three consecutive inner winding slots, and in M layers on the radially outer side, each pole and each phase occupying three consecutive outer winding slots. The three inner winding slots and three outer winding slots of each pole and each phase are staggered by one slot position in the circumferential direction.
[0015] In at least one embodiment, viewed circumferentially along the stator core,
[0016] The sub-conductors within each first conductor group are arranged in the following order according to the winding slots they are inserted into: the second conductor, the first conductor, and the third conductor; and the sub-conductors within each second conductor group are arranged in the following order according to the following order according to the winding slots they are inserted into: the third conductor, the second conductor, and the fourth conductor.
[0017] or,
[0018] The sub-conductors within each first conductor group are arranged in the following order according to the winding slots they are inserted into: the second conductor, the first conductor, and the third conductor; and the sub-conductors within each second conductor group are arranged in the following order according to the following order according to the winding slots they are inserted into: the first conductor, the fifth conductor, and the second conductor.
[0019] or,
[0020] The sub-conductors within each first conductor group are arranged in the order in which they are inserted into the winding slots as follows: the first conductor, the third conductor, and the second conductor; and the sub-conductors within each second conductor group are arranged in the order in which they are inserted into the winding slots as follows: the second conductor, the fourth conductor, and the third conductor.
[0021] or,
[0022] The sub-conductors in each of the first conductor groups are arranged in the order in which they are inserted into the winding slots as follows: the first conductor, the third conductor, and the second conductor; and the sub-conductors in each of the second conductor groups are arranged in the order in which they are inserted into the winding slots as follows: the fifth conductor, the second conductor, and the first conductor.
[0023] In at least one embodiment, for each phase of the flat wire stator winding, within each branch, the span between adjacent sub-conductors on the series path, except at first-type and second-type nodes, is K.
[0024] The first type of node is located between two adjacent sub-conductors in the radial innermost or radial outermost layer, which are connected in series and have opposite directions in the circumferential direction. The span between the two sub-conductors at the first type of node is K+1 or K-1.
[0025] The second type of node is located between two sub-conductors that are adjacent on the series path and are located on the Mth layer and the M+1th layer respectively. The span between the two sub-conductors at the second type of node is either K+1 or K-1, or the span between the two sub-conductors at the second type of node is either K+2 or K-2.
[0026] In at least one embodiment, when the second conductor group includes the second conductor, the third conductor, and the fourth conductor, the span between the two sub-conductors at the second type of node is K+1.
[0027] In the case where the second conductor group includes the first conductor, the second conductor, and the fifth conductor, the span between the two sub-conductors at the second type of node is K-1.
[0028] In at least one embodiment, viewed circumferentially along the stator core,
[0029] The sub-conductors within each of the first conductor groups are arranged in the following order according to the winding slots into which they are inserted: the second conductor, the first conductor, and the third conductor, and...
[0030] The sub-conductors within each second conductor group are arranged in the order in which they are inserted into the winding slots as follows: the third conductor, the second conductor, and the fourth conductor, or...
[0031] The sub-conductors within each second conductor group are arranged in the order in which they are inserted into the winding slots as follows: the first conductor, the fifth conductor, and the second conductor;
[0032] Furthermore, for each of the aforementioned branches, at the first type of node, if one of the second conductors is directly connected in series with the first conductor,
[0033] In each phase of the flat wire stator winding, the span between the two sub-conductors at the first type node of one branch is K+1, and the span between the two sub-conductors at the first type node of the other branch is K-1.
[0034] In at least one embodiment, viewed circumferentially along the stator core,
[0035] The sub-conductors within each of the first conductor groups are arranged in the following order according to the winding slots into which they are inserted: the second conductor, the first conductor, and the third conductor, and...
[0036] The sub-conductors within each second conductor group are arranged in the order in which they are inserted into the winding slots as follows: the third conductor, the second conductor, and the fourth conductor, or...
[0037] The sub-conductors within each second conductor group are arranged in the order in which they are inserted into the winding slots as follows: the first conductor, the fifth conductor, and the second conductor;
[0038] Furthermore, for each of the aforementioned branches, at the first type of node, if one of the second conductors is directly connected in series with the third conductor,
[0039] In each phase of the flat wire stator winding, the span between the two sub-conductors at the first type node of one branch is K+2, and the span between the two sub-conductors at the first type node of the other branch is K-2.
[0040] In at least one embodiment, viewed circumferentially along the stator core,
[0041] The sub-conductors within each of the first conductor groups are arranged in the order in which they are inserted into the winding slots: the first conductor, the third conductor, and the second conductor, and...
[0042] The sub-conductors within each second conductor group are arranged in the order in which they are inserted into the winding slots as follows: the second conductor, the fourth conductor, and the third conductor, or...
[0043] The sub-conductors within each second conductor group are arranged in the following order according to the winding slots into which they are inserted: the fifth conductor, the second conductor, and the first conductor;
[0044] Furthermore, for each of the aforementioned branches, at the first type of node, if one of the second conductors is directly connected in series with the first conductor,
[0045] In each phase of the flat wire stator winding, the span between the two sub-conductors at the first type node of one branch is K+2, and the span between the two sub-conductors at the first type node of the other branch is K-2.
[0046] In at least one embodiment, viewed circumferentially along the stator core,
[0047] The sub-conductors within each of the first conductor groups are arranged in the order in which they are inserted into the winding slots: the first conductor, the third conductor, and the second conductor, and...
[0048] The sub-conductors within each second conductor group are arranged in the order in which they are inserted into the winding slots as follows: the second conductor, the fourth conductor, and the third conductor, or...
[0049] The sub-conductors within each second conductor group are arranged in the following order according to the winding slots into which they are inserted: the fifth conductor, the second conductor, and the first conductor;
[0050] Furthermore, for each of the aforementioned branches, at the first type of node, if one of the second conductors is directly connected in series with the first conductor,
[0051] In each phase of the flat wire stator winding, the span between the two sub-conductors at the first type node of one branch is K+1, and the span between the two sub-conductors at the first type node of the other branch is K-1.
[0052] In at least one embodiment, the value of K is 9.
[0053] In at least one embodiment, the outlet and lead ends of each branch are located in the outermost radial layer, or
[0054] The outgoing and incoming ends of each branch are located in the innermost radial layer.
[0055] The stator structure according to the present invention is compact, has low manufacturing cost, minimal harmonic interference during operation, and good performance. Attached Figure Description
[0056] Figure 1 This is a schematic diagram of a stator according to one embodiment of the present invention.
[0057] Figure 2 This is a schematic diagram of a possible two-branch three-phase winding using a star connection.
[0058] Figure 3 This is a schematic diagram of a possible two-branch three-phase winding connected in a delta configuration.
[0059] Figure 4 This is a schematic diagram of a flat wire stator winding according to an embodiment of the present invention.
[0060] Figure 5 This is a schematic diagram of one phase of the winding according to the first embodiment of the present invention.
[0061] Figure 6 This is a front view schematic diagram of a sub-conductor according to one embodiment of the present invention.
[0062] Figure 7 yes Figure 6 A top view of a neutron conductor.
[0063] Figure 8 and Figure 9 These are schematic diagrams from the front and top views of different span sub-conductors twisted in reverse at the welded end of one leg, according to an embodiment of the present invention.
[0064] Figure 10 This is a layered schematic diagram of a winding slot of a stator core according to the first embodiment of the present invention.
[0065] Figure 11 This is a schematic diagram of the arrangement of sub-conductors within two conductor groups according to the first embodiment of the present invention.
[0066] Figure 12 This is a schematic diagram of the wiring configuration of a phase winding according to the first embodiment of the present invention.
[0067] Figure 13 This is a schematic diagram of one phase of the winding according to the second embodiment of the present invention.
[0068] Figure 14 This is a schematic diagram of the arrangement of sub-conductors within two conductor groups according to a second embodiment of the present invention.
[0069] Figure 15 This is a schematic diagram of the wiring configuration of a phase winding according to a second embodiment of the present invention.
[0070] Figure 16 This is a schematic diagram of the wiring configuration of a phase winding according to a third embodiment of the present invention.
[0071] Figure 17 This is a schematic diagram of the wiring configuration of a phase winding according to the fourth embodiment of the present invention.
[0072] Figure 18 This is a schematic diagram of the wiring configuration of a phase winding according to the fifth embodiment of the present invention.
[0073] Figure 19 This is a schematic diagram of a winding connected at a reverse twist node according to another embodiment of the present invention using an auxiliary conductor.
[0074] Explanation of reference numerals in the attached figures:
[0075] 10 stator core; 20 flat wire stator winding;
[0076] 21 Crown end; 21a Fold; 22 Welded end;
[0077] 20a First conductor group; 20b Second conductor group;
[0078] 200 Sub-conductor; 201 First conductor; 202 Second conductor; 203 Third conductor; 204 Fourth conductor; 205 Fifth conductor;
[0079] 200F auxiliary conductor; 30 outgoing copper busbar. Detailed Implementation
[0080] Exemplary embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood that these specific descriptions are for teaching those skilled in the art how to implement the present invention, and are not intended to exhaustively describe all possible ways of the invention, nor to limit the scope of the invention.
[0081] Reference Figures 1 to 19 This application describes the stator of a flat wire motor according to the present application. Unless otherwise specified, refer to... Figure 1 A represents the axial direction of the stator, R represents the radial direction of the stator, and C represents the circumferential direction of the stator.
[0082] (First Implementation)
[0083] Reference Figures 1 to 12 The stator according to this application includes a stator core 10, a flat wire stator winding 20 (hereinafter also referred to as winding 20), and a lead-out copper busbar 30.
[0084] The inner circumference of the stator core 10 has winding slots (hereinafter also referred to as slots) extending along the axial direction A. The number of slots q per pole per phase is 3, and the number of poles 2P of the stator is an even multiple of 3. In this embodiment, the number of poles 2P = 6, so the total number of winding slots is 54. It should be understood that in other possible embodiments, the number of winding slots will vary accordingly with different numbers of poles 2P.
[0085] like Figure 2 and Figure 3 As shown, each phase winding includes two parallel branches. A three-phase winding can be, for example, as shown below. Figure 2 As shown, it can be connected in a star shape, or as shown in the diagram. Figure 3 As shown, they are connected to form a triangle.
[0086] The number of layers formed by the winding in the winding slot in the radial direction R is 2M, where M is an odd number greater than or equal to 2, that is, the number of layers may be 6, 10, 14, etc.
[0087] Each phase winding 20 includes multiple first conductor groups 20a and multiple second conductor groups 20b. Each conductor group includes three sub-conductors 200. Specifically, refer to... Figure 11 The first conductor group 20a includes a first conductor 201, a second conductor 202 and a third conductor 203; the second conductor group 20b includes a second conductor 202, a third conductor 203 and a fourth conductor 204.
[0088] It should be understood that Figure 11 This only schematically illustrates the grouping of sub-conductors 200. For the specific structure of sub-conductors 200, please refer to... Figure 6 .
[0089] Each sub-conductor 200 is generally U-shaped, with one end connected along the axial direction A to form a crown end 21, and the other end forked to form a solder end 22. Two legs of each sub-conductor 200 extending along the axial direction A are used for insertion into a winding slot.
[0090] Figure 7 A top view of the sub-conductor 200 is shown. Since each sub-conductor 200 is multi-layered, that is, the two legs of each sub-conductor 200 are located in different layers, a fold 21a is formed at the crown end 21 of the sub-conductor 200 in this embodiment, which allows the two legs of the sub-conductor 200 to be staggered in the radial direction R.
[0091] The cross-layer structure of the sub-conductor 200 also ensures that the sub-conductor 200, especially the sub-conductor 200 located in the innermost radial layer, does not occupy too much radial space, thereby allowing the winding 20 to have a larger inner diameter at the end, which facilitates the installation of the rotor.
[0092] For each sub-conductor 200, the two adjacent layers it traverses are the 2Nth layer and the 2N-1th layer, where N is a positive integer.
[0093] Next, refer to Figures 10 to 12 Taking a stator with a six-layer structure formed in the slot as an example, the stator according to the first embodiment of this application will be described in detail. For ease of description, the arrangement of each sub-conductor 200 will be described in detail using one phase, such as phase U, as an example.
[0094] Reference Figure 10In the following description, the different layers within the winding slot are represented by lowercase English letters a, b, c, d, e, and f, which respectively represent the 1st, 2nd, 3rd, 4th, 5th, and 6th layers counting from the radially outer side to the radially inner side. It should be understood that the layers within the winding slot are a virtual concept, formed by the stacking of the legs of multiple sub-conductors 200. When no sub-conductors 200 are provided in the slot, there is no layered structure within the slot.
[0095] In this embodiment, each phase winding 20 includes 18 conductor groups, of which 12 are first conductor groups 20a and 6 are second conductor groups 20b.
[0096] Layers a and b are configured with 6 first conductor groups 20a, layers c and d are configured with 6 second conductor groups 20b, and layers e and f are configured with 6 first conductor groups 20a.
[0097] The span is measured by the difference in the slot number on the circumferential C between the two winding slots into which the two legs of the sub-conductor 200 are inserted. The span of the first conductor 201 is K+1, the span of the second conductor 202 is K, the span of the third conductor 203 is K-1, and the span of the fourth conductor 204 is K-2, where K is a positive integer. In this embodiment, K=9.
[0098] Observing along the circumferential direction C of the stator core 10, the sub-conductors 200 of the first conductor group 20a are arranged in the following order according to the winding slots they are inserted into: the second conductor 202, the first conductor 201, and the third conductor 203. The sub-conductors 200 of the second conductor group 20b are arranged in the following order according to the following order according to the winding slots they are inserted into: the third conductor 203, the second conductor 202, and the fourth conductor 204.
[0099] This arrangement, combined with the span of the four types of sub-conductors 200, ensures that the legs on both sides of the three sub-conductors 200 in each conductor group are located in three consecutive slots. For example, Figure 12 The three sub-conductors 200 of a first conductor group 20a located in the f layer and e layer, starting from the 4th slot, have three legs on one side occupying slots 4, 5 and 6 (f layer) respectively, and legs on the other side occupying slots 13, 14 and 15 (e layer) respectively.
[0100] The slots occupied by the legs of the sub-conductor 200 in the three radially inner layers (i.e., layers d, e, and f) are offset by one slot in the circumferential direction C compared to the slots occupied by the three radially outer layers (i.e., layers a, b, and c). In other words, within the M radially inner layers, each pole and each phase occupies three consecutive inner winding slots; within the M radially outer layers, each pole and each phase occupies three consecutive outer winding slots; the three inner winding slots and three outer winding slots of each pole and each phase are offset by one slot in the circumferential direction.
[0101] For example, Figure 11 In the first pole, the three inner winding slots are slots 4, 5 and 6 in layers d, e and f, and the three outer winding slots are slots 3, 4 and 5 in layers a, b and c. They are offset by one slot in the circumferential direction.
[0102] This interlayer misalignment, or the staggered arrangement of slots occupied by different layers in the circumferential direction C, can reduce winding harmonics, thereby reducing NVH during motor operation.
[0103] According to the above rules, the position of each conductor group in each slot and layer can be determined. The specific route of each branch, that is, the series connection sequence of each sub-conductor 200 of each branch, is achieved by selecting appropriate adjacent legs of adjacent sub-conductors 200 for electrical connection (for example, in this embodiment, two legs are welded at the welding end 22).
[0104] For ease of description, the arrangement of the two legs of each sub-conductor 200 in different slots and layers is represented by symbols similar to the following:
[0105] First conductor 201: {*a-*b};
[0106] Second conductor 202: [*a-*b];
[0107] Third conductor 203: (*a-*b);
[0108] Fourth conductor 204: <*a-*b>;
[0109] Where * represents the slot number, and a / b represents the layer number within the slot.
[0110] For example, {5f-15e} indicates that the two legs of the first conductor 201 (with a span of 10) are inserted into the f layer of the 5th slot and the e layer of the 15th slot, respectively; [4f-13e] indicates that the two legs of the second conductor 202 (with a span of 9) are inserted into the f layer of the 4th slot and the e layer of the 13th slot, respectively; (6f-14e) indicates that the two legs of the third conductor 203 (with a span of 8) are inserted into the f layer of the 6th slot and the e layer of the 14th slot, respectively; and <6d-13c> indicates that the two legs of the fourth conductor 204 (with a span of 7) are inserted into the d layer of the 6th slot and the c layer of the 13th slot, respectively.
[0111] The connection of welded end 22 follows this rule:
[0112] Within each branch, the span between adjacent sub-conductors 200 on the series path is K=9, except for the first type of node (hereinafter also called the anti-torsion node) and the second type of node (hereinafter also called the misalignment node).
[0113] The anti-torsion node is located between two adjacent sub-conductors 200 in the radial innermost or radial outermost layer, which are adjacent in the series path and have opposite series directions in the circumferential direction C. The span between the two sub-conductors 200 at the anti-torsion node is K+1=10 or K-1=8; or more specifically, the span between the two sub-conductors 200 at the anti-torsion node of one branch is 10, and the span between the two sub-conductors 200 at the anti-torsion node of the other branch is 8.
[0114] In this embodiment, the outgoing terminal of each branch is located in layer a. For example, taking layer a of slot 21 as the starting point and observing the direction of the first branch, the sub-conductor 200 of the first branch first crosses along the direction of decreasing slot number (defined as counterclockwise) and increasing layer number. For example, the second conductor 202 {21a-12b} crosses from slot 21 to slot 12, and from layer a to layer b. In this order, the series sub-conductors 200 of the first branch first circle around layer a and layer b in a counterclockwise direction (in the direction of increasing layer number from layer a to layer b), and then extend to layer c and layer d (in the direction of increasing layer number from layer c to layer d). The circuit continues counter-clockwise around the first branch lead (in the direction of increasing layer number), then extends to layers e and f (in the direction of increasing layer number from layer e to layer f), continuing counter-clockwise around the first branch lead. It then encounters a reverse twist node and begins clockwise rotation around layers f and e (in the direction of decreasing layer number from layer f to layer e), then extends to layers d and c (in the direction of decreasing layer number from layer d to layer c) and rotates clockwise around the first branch lead. The reverse twist node is located in the innermost radial layer opposite the outermost radial layer (the outgoing lead).
[0115] The adjacent legs of two adjacent sub-conductors 200 at the anti-torsion node are located on the same layer, which is layer f in this embodiment.
[0116] The misalignment node is located between two sub-conductors 200 that are adjacent on the series path and are located on the M=3rd and M+1=4th layers respectively. The span between the two sub-conductors 200 at the misalignment node is K+1=10.
[0117] According to the span rule of the welding end 22 described above, the arrangement order of each sub-conductor of the first branch in this embodiment will be: [First second conductor 202] - [Second second conductor 202] - [Third second conductor 202] - (First third conductor 203) - (Second third conductor 203) - (Third third conductor 203) - [Fourth second conductor 202] - [Fifth second conductor 202] - [Sixth second conductor 202] - {First first conductor 201} - (Fourth third conductor 203) - {Second first conductor 201} - (5th third conductor 203)-{3rd first conductor 201}-(6th third conductor 203)-[7th second conductor 202]-<1st fourth conductor 204>-[8th second conductor 202]-<2nd fourth conductor 204>-[9th second conductor 202]-<3rd fourth conductor 204>-{4th first conductor 201}-(7th third conductor 203)-{5th first conductor 201}-(8th third conductor 203)-{6th first conductor 201}-(9th third conductor 203).
[0118] Specifically, the orientation of each sub-conductor 200 in the first branch is as follows:
[0119] Outgoing terminals - [21a-12b] - [3a-48b] - [39a-30b] -
[0120] (21c-13d)=(3c-49d)=(39c-31d)-
[0121] [22e-13f]-[4e-49f]-[40e-31f]~
[0122] {41f-51e}-(6f-14e)-{23f-33e}-(42f-50e)-{5f-15e}-(24f-32e)-
[0123] [41d-50c]=<6d-13c>=[23d-32c]=<42d-49c>=[5d-14c]=<24d-31c>-
[0124] {40b-50a}-(5b-13a)-{22b-32a}-(41b-49a)-{4b-14a}-(23b-31a)-lead end
[0125] It should be understood that the above text was deliberately divided into lines to facilitate the reader's observation of the placement of the sub-conductors 200 between different adjacent layers and to facilitate the observation of the different arrangements before and after the anti-twist node. In fact, the sub-conductors 200 located in different lines are still connected in series.
[0126] In the above series arrangement, the places indicated by "~" represent anti-twist nodes. As can be seen, the sixth second conductor 202, i.e., [40e-31f], has one leg in slot 31, and the first first conductor 201, i.e., {41f-51e}, has one leg in slot 41. An anti-twist connection is formed between these two legs, and the span between the welded ends of these two legs is 10, that is, the anti-twist span here is 10.
[0127] The method for changing the span of adjacent legs at weld end 22 can be referred to Figure 8 and Figure 9 The span of the welded end 22 can be changed by folding one of the legs toward, for example, the outer periphery.
[0128] In the above serial arrangement, the places marked with "=" represent misaligned nodes. It can be seen that the misaligned nodes occur between layers c and d. Specifically, the misaligned nodes are located between numbers 8 and 9, 10 and 11, 32 and 33, 34 and 35, 36 and 37, 38 and 39, and 40 and 41, with a misalignment span of 10.
[0129] The direction of the first branch corresponds to Figure 12 The number sequence is underlined and bolded.
[0130] The order of the numerical serial numbers represents the serial connection order. The column number and row number of each numerical serial number represent the slot number and layer number into which each leg of the sub-conductor 200 is inserted, respectively.
[0131] For example, the numbers 1, 2, 3, and 4 are located in slot 21 (a), slot 12 (b), slot 3 (a), and slot 48 (b), respectively, indicating that four consecutive legs in series are located in these layers. Corresponding to the sequence above, these four legs belong to the first leg of the first second conductor 202, the second leg of the first second conductor 202, the first leg of the second second conductor 202, and the second leg of the second second conductor 202, respectively. The second leg of the first second conductor 202 and the first leg of the second second conductor 202 are connected together by welding at the welding end 22.
[0132] Next, we will introduce the second branch of this phase. The outgoing end of the second branch is located in the adjacent slot to the outgoing end of the first branch, namely slot 22.
[0133] When selecting the type of sub-conductor 200 in the second branch, the arrangement of the sub-conductor 200 types is exactly the opposite of that in the first branch, according to the series connection order from the output end to the lead end.
[0134] Second branch road:
[0135] Outgoing terminal -(22a-14b)-{5a-49b}-(40a-32b)-{23a-13b}-(4a-50b)-{41a-31b}-
[0136] <22c-15d>=[5c-50d]=<40c-33d>=[23c-14d]=<4c-51d>=[41c-32d]-
[0137] (23e-15f)-{6e-50f}-(41e-33f)-{24e-14f}-(5e-51f)-{42e-32f}~
[0138] [40f-49e]-[4f-13e]-[22f-31e]-
[0139] (40d-48c)-(4d-12c)-(22d-30c)-
[0140] [39b-48a]-[3b-12a]-[21b-30a]-Lead end
[0141] The direction of the second branch corresponds to Figure 11 The numbers in the diagram are slanted and do not have underlines. It can be seen that the anti-torsion node of the second branch is located between numbers 36 and 37 in the diagram, with an anti-torsion span of 8.
[0142] The misaligned nodes are located between numbers 14 and 15, 16 and 17, 18 and 19, 20 and 21, and 22 and 23, with a misalignment span of 10.
[0143] from Figure 12 As can be seen intuitively, with this wiring method, the outgoing ends of two branches are located in adjacent slots, and similarly, the incoming ends of two branches are located in adjacent slots, with the outgoing and incoming ends of two branches located at adjacent poles. In this way, the ends of all branches are located within a very small range on the circumferential C, making the structure of the copper busbar very compact and material-saving.
[0144] (Second Implementation)
[0145] Reference Figures 13 to 15 The second embodiment of this application is described below. The second embodiment is a variation of the first embodiment. Components with the same or similar structure or function as those in the first embodiment are marked with the same reference numerals, and specific descriptions of these components are omitted.
[0146] The main difference between this embodiment and the first embodiment is that the slot offset directions of layer c and layer d are different when they are misaligned.
[0147] In the first embodiment, the three inner winding slots (winding slots located in layers d, e, and f) of each pole and each phase are one slot behind the three outer winding slots (winding slots located in layers a, b, and c) in the circumferential direction; while in this embodiment, the three inner winding slots of each pole and each phase are one slot ahead of the three outer winding slots in the circumferential direction.
[0148] Correspondingly, the sub-conductors 200 included in the second conductor group 20b also differ from those in the first embodiment. In this embodiment, the sub-conductors 200 included in the second conductor group 20b include a first conductor 201, a second conductor 202, and a fifth conductor 205, with spans of 10, 9, and 11 (i.e., K+2), respectively. Observed along the circumferential direction C of the stator core 10, the sub-conductors 200 of the second conductor group 20b are arranged in the following order according to the winding slots into which they are inserted: first conductor 201, fifth conductor 205, and second conductor 202.
[0149] This misalignment method and the combination of conductors make the span at the misalignment node become K-1=8.
[0150] Since the other routing rules are similar to those in the first embodiment, the routing sequence of the two branches will be briefly described below. The arrangement of the two legs of the fifth conductor 205 in different slots and layers is represented by symbols such as [*a-*b].
[0151] First branch road:
[0152] Outgoing terminals - [22a-13b] - [4a-49b] - [40a-31b] -
[0153] {22c-12d}={4c-48d}-{40c-30d}-
[0154] [21e-12f]-[3e-48f]-[39e-30f]~
[0155] {40f-50e}-(5f-13e)-{22f-32e}-(41f-49e)-{4f-14e}-(23f-31e)-
[0156] 【40d-51c】=[5d-14c]=【22d-33c】=[41d-50c]=【4d-15c】=[23d-32c]-
[0157] {41b-51a}-(6b-14a)-{23b-33a}-(42b-50a)-{5b-15a}-(24b-32a)-lead end
[0158] Second branch road:
[0159] Outgoing terminals -(23a-15b)-{6a-50b}-(41a-33b)-{24a-14b}-(5a-51b)-{42a-32b}-
[0160] [23c-14d]=[6c-49d]=[41c-32d]=[24c-13d]=[5c-50d]=[42c-31d]-
[0161] (22e-14f)-{5e-49f}-(40e-32f)-{23e-13f}-(4e-50f)-{41e-31f}~
[0162] [39f-48e]-[3f-12e]-[21f-30e]-
[0163] {39d-49c}={3d-13c}={21d-31c}-
[0164] [40b-49a]-[4b-13a]-[22b-31a]-Lead end
[0165] (Third implementation method)
[0166] Reference Figure 16 This application describes a third embodiment. The third embodiment is a variation of the first embodiment. Components with the same or similar structure or function as those in the first embodiment are labeled with the same reference numerals, and specific descriptions of these components are omitted.
[0167] The main difference between this embodiment and the first embodiment is that in the first embodiment, when a second conductor 202 is connected in series with other conductors at the first type node (anti-torsion node) of each branch of each phase, a third conductor 203 is selected; while in this embodiment, when a second conductor 202 is connected in series with other conductors at the first type node of each branch of each phase, it is directly connected to the third conductor 203.
[0168] In accordance with this connection sequence, in this embodiment, the span at the anti-torsion node of one branch is K+2=11, and the span at the anti-torsion node of the other branch is K-2=7.
[0169] The specific routing order of the two branches:
[0170] First branch road:
[0171] Outgoing terminals - [21a-12b] - [3a-48b] - [39a-30b] -
[0172] (21c-13d)=(3c-49d)=(39c-31d)-
[0173] [22e-13f]-[4e-49f]-[40e-31f]~
[0174] (42f-50e)-{5f-15e}-(24f-32e)-{41f-51e}-(6f-14e)-{23f-33e}-
[0175] <42d-49c>=[5d-14c]=<24d-31c>=[41d-50c]=<6d-13c>=[23d-32c]-
[0176] (41b-49a)-{4b-14a}-(23b-31a)-{40b-50a}-(5b-13a)-{22b-32a}-lead end
[0177] Second branch road:
[0178] Outgoing terminals -{23a-13b}-(4a-50b)-{41a-31b}-(22a-14b)-{5a-49b}-(40a-32b)-
[0179] [23c-14d]=<4c-51d>=[41c-32d]=<22c-15d>=[5c-50d]=<40c-33d>-
[0180] {24e-14f}-(5e-51f)-{42e-32f}-(23e-15f)-{6c-50f}-(41c-33f)~
[0181] [40f-49e]-[4f-13e]-[22f-31e]-
[0182] (40d-48c)=(4d-12c)=(22d-30c)-
[0183] [39b-48a]-[3b-12a]-[21b-30a]-Lead end
[0184] (Fourth Implementation)
[0185] Reference Figure 17 The fourth embodiment of this application is described below. The fourth embodiment is a variation of the first embodiment. Components with the same or similar structure or function as those in the first embodiment are marked with the same reference numerals, and specific descriptions of these components are omitted.
[0186] The main difference between this embodiment and the first embodiment is that, when viewed along the circumferential direction C of the stator core 10, the sub-conductors 200 in the first conductor group 20a are arranged in the order of their insertion into the winding slots as follows: first conductor 201, third conductor 203 and second conductor 202; and the sub-conductors 200 in the second conductor group 20b are arranged in the order of their insertion into the winding slots as follows: second conductor 202, fourth conductor 204 and third conductor 203.
[0187] In accordance with this connection sequence, in this embodiment, the span at the anti-torsion node of one branch is K+2=11, and the span at the anti-torsion node of the other branch is K-2=7.
[0188] The specific routing order of the two branches:
[0189] First branch road:
[0190] Outgoing terminals -(21a-13b)-{4a-48b}-(39a-31b)-{22a-12b}-(3a-49b)-{40a-30b}-
[0191] <21c-14d>=[4c-49d]=<39c-32d>=[22c-13d]=<3c-50d>=[40c-31d]-
[0192] (22e-14f)-{5e-49f}-(40e-32f)-{23e-13f}-(4e-50f)-{41e-31f}~
[0193] [42f-51e]-[6f-15e]-[24f-33e]-
[0194] (42d-50c)=(6d-14c)=(24d-32c)-
[0195] [41b-50a]-[5b-14a]-[24b-32a]-Lead end
[0196] Second branch road:
[0197] Outgoing cable terminals - [23a-14b] - [5a-50b] - [41a-32b] -
[0198] (23c-15d)=(5c-51d)=(41c-33d)-
[0199] [24e-15f]-[6e-51f]-[42e-33f]~
[0200] {40f-50e}-(5f-13e)-{22f-32e}-(41f-49e)-{4f-14e}-(23f-31e)-
[0201] [40d-49c]=<5d-12c>=[22d-31c]=<41d-48c>=[4d-13c]=<23d-30c>-
[0202] {39b-49a}-(4b-12a)-{21b-31a}-(40b-48a)-{3b-13a}-(22b-30a)-lead end
[0203] (Fifth Implementation)
[0204] Reference Figure 18 The fifth embodiment of this application is described below. The fifth embodiment is a variation of the first, third, and fourth embodiments. Components with the same or similar structure or function as those in the first embodiment are marked with the same reference numerals, and specific descriptions of these components are omitted.
[0205] The main difference between this embodiment and the first embodiment is:
[0206] First, observing along the circumferential direction C of the stator core 10, the sub-conductors 200 in the first conductor group 20a are arranged in the following order according to the winding slots they are inserted into: first conductor 201, third conductor 203 and second conductor 202; the sub-conductors 200 in the second conductor group 20b are arranged in the following order according to the following order according to the winding slots they are inserted into: second conductor 202, fourth conductor 204 and third conductor 203.
[0207] Second, at the first type node (anti-torsion node) of each branch of each phase, one of the second conductors 202 is connected directly to the third conductor 203 when connected in series with other conductors.
[0208] The simultaneous change of the above two rules results in this connection sequence being adapted such that, in this embodiment, the span at the anti-torsion node of one branch is K+1=10, and the span at the anti-torsion node of the other branch is K-1=8 (the same as in the first embodiment).
[0209] The specific routing order of the two branches:
[0210] First branch road:
[0211] Outgoing terminals -{22a-12b}-(3a-49b)-{40a-30b}-(21a-13b)-{4a-48b}-(39a-31b)-
[0212] [22c-13d]=<3c-50d>=[40c-31d]=<21c-14d>=[4c-49d]=<39c-32d>-
[0213] {23e-13f}-(4e-50f)-{41e-31f}-(22e-14f)-{5e-49f}-(40e-32f)~
[0214] [42f-51e]-[6f-15e]-[24f-33e]-
[0215] (42d-50c)=(6d-14c)=(24d-32c)-
[0216] [41b-50a]-[5b-14a]-[23b-32a]-Lead end
[0217] Second branch road:
[0218] Outgoing cable terminals - [23a-14b] - [5a-50b] - [41a-32b] -
[0219] (23c-15d)=(5c-51d)=(41c-33d)-
[0220] [24e-15f]-[6e-51f]-[42e-33f]~
[0221] (41f-49e)-{4f-14e}-(23f-31e)-{40f-50e}-(5f-13e)-{22f-32e}-
[0222] <41d-48c>=[4d-13c]=<23d-30c>=[40d-49c]=<5d-12c>=[22d-31c]-
[0223] (40b-48a)-{3b-13a}-(22b-30a)-{39b-49a}-(4b-12a)-{21b-31a}-lead end
[0224] It should be understood that the above-described embodiments and some aspects or features thereof can be appropriately combined. For example:
[0225] The second embodiment can be modified with reference to the third to fifth embodiments. That is, when the sub-conductors 200 of the second conductor group 20b are the first conductor 201, the second conductor 202 and the fifth conductor 205 respectively, the following three modifications are possible.
[0226] The first variation: At the first type of node (reverse twist node) in each branch of each phase, one of the second conductors 202, when connected in series with other conductors, is directly connected to the third conductor 203. Corresponding to this connection sequence, in this variation, the span at the reverse twist node of one branch is K+2=11, and the span at the reverse twist node of another branch is K-2=7. The span at the misaligned nodes is K-1=8.
[0227] The second variation: Observing along the circumferential direction C of the stator core 10, the sub-conductors 200 in the first conductor group 20a are arranged in the following order according to their insertion into the winding slots: first conductor 201, third conductor 203, and second conductor 202. The sub-conductors 200 in the second conductor group 20b are arranged in the following order according to their insertion into the winding slots: fifth conductor 205, second conductor 202, and first conductor 201. Corresponding to this connection sequence, in this variation, the span at the anti-torsion node of one branch is K+2=11, and the span at the anti-torsion node of the other branch is K-2=7. The span at the misaligned nodes is K-1=8.
[0228] The third variation: First, observing along the circumferential direction C of the stator core 10, the sub-conductors 200 in the first conductor group 20a are arranged in the following order according to their insertion into the winding slots: first conductor 201, third conductor 203, and second conductor 202. The sub-conductors 200 in the second conductor group 20b are arranged in the following order according to their insertion into the winding slots: fifth conductor 205, second conductor 202, and first conductor 201. Second, at the first type of node (anti-torsion node) of each branch in each phase, one of the second conductors 202, when connected in series with other conductors, is directly connected to the third conductor 203. Corresponding to this connection sequence, in this variation, the span at the anti-torsion node of one branch is K+1=10, and the span at the anti-torsion node of another branch is K-1=8. The span at the misaligned nodes is always K-1=8.
[0229] This invention has at least one of the following advantages:
[0230] (i) Each subconductor 200 spans two layers, so that the subconductor 200, especially the subconductor 200 located on the radial innermost side, does not occupy too much space in the radial direction, thereby the winding 20 has a larger inner diameter at the end, which facilitates the installation of the rotor.
[0231] (ii) The output terminals and lead terminals of the windings of the two branches of each phase are spaced small in the circumferential direction C, making the structure compact and simple, and the branch windings are spatially symmetrical, so that no loop current is generated.
[0232] (iii) The circumferentially staggered routing of the inner and outer M layers of the slots of each phase conductor can reduce harmonic effects and noise.
[0233] Of course, the present invention is not limited to the above-described embodiments. Those skilled in the art, under the guidance of the present invention, can make various modifications to the above-described embodiments without departing from the scope of the present invention. For example:
[0234] (i) The output terminal and the lead terminal in the above embodiments can be interchanged;
[0235] (ii) In the above embodiments, the lead-out end and the lead-in end are placed in the outermost radial layer and the anti-twist node is placed in the innermost radial layer. However, this is not necessary. For example, the lead-out end and the lead-in end can be located in the innermost radial layer and the anti-twist node can be located in the outermost radial layer.
[0236] (iii) In the above embodiments, the slot number selected for each pole and each phase can be shifted as a whole in the circumferential direction C.
[0237] (iv) For the connection of welded end 22 under reverse torsional span, except as... Figure 8 and Figure 9 In addition to changing the span between the legs of the sub-conductor 200 and the adjacent sub-conductor 200 by folding the sub-conductor 200 at the welding end 22 as described in the example, it can also be referred to, for example, as shown in the example. Figure 19 Other auxiliary conductors 200f (also known as busbars) are used to electrically connect the legs of adjacent sub-conductors 200.
Claims
1. A stator for a flat wire motor, comprising a stator core (10) and flat wire stator windings (20), characterized in that, The stator has 3 winding slots per pole per phase, the stator has an even multiple of 3 poles (2P), and the flat wire stator winding (20) forms 2M layers in the winding slots, where M is an odd number greater than 2. The flat wire stator winding (20) includes a three-phase winding. Each phase of the flat wire stator winding (20) includes two parallel branches. Each branch is formed by multiple U-shaped sub-conductors (200) connected in series. Each phase of the flat wire stator winding (20) includes a plurality of first conductor groups (20a) and a plurality of second conductor groups (20b), wherein the first conductor group (20a) includes three sub-conductors (200), namely a first conductor (201), a second conductor (202) and a third conductor (203). The second conductor group (20b) includes three sub-conductors (200), namely the second conductor (202), the third conductor (203) and the fourth conductor (204), or the first conductor (201), the second conductor (202) and the fifth conductor (205). The span of the first conductor (201) is K+1, the span of the second conductor (202) is K, the span of the third conductor (203) is K-1, the span of the fourth conductor (204) is K-2, and the span of the fifth conductor (205) is K+2, where K is a positive integer. Each of the sub-conductors (200) spans two adjacent layers, namely the 2Nth layer and the 2N-1th layer, where N is a positive integer. The second conductor group (20b) is disposed in the Mth layer and the (M+1)th layer, and the first conductor group (20a) is disposed in the other layers besides the Mth layer and the (M+1)th layer. The slots occupied by the sub-conductor (200) are located in M layers on the radially inner side, with each pole and each phase occupying three consecutive inner winding slots, and in M layers on the radially outer side, each pole and each phase occupying three consecutive outer winding slots. The three inner winding slots and three outer winding slots of each pole and each phase are staggered by one slot position in the circumferential direction of the stator core.
2. The stator of the flat wire motor according to claim 1, characterized in that, When viewed along the circumferential direction (C) of the stator core (10), The sub-conductors (200) in each of the first conductor groups (20a) are arranged in the order in which they are inserted into the winding slots as follows: the second conductor (202), the first conductor (201), and the third conductor (203). Similarly, the sub-conductors (200) in each of the second conductor groups (20b) are arranged in the order in which they are inserted into the winding slots as follows: the third conductor (203), the second conductor (202), and the fourth conductor (204). or, The sub-conductors (200) in each of the first conductor groups (20a) are arranged in the order in which they are inserted into the winding slots as follows: the second conductor (202), the first conductor (201), and the third conductor (203). Similarly, the sub-conductors (200) in each of the second conductor groups (20b) are arranged in the order in which they are inserted into the winding slots as follows: the first conductor (201), the fifth conductor (205), and the second conductor (202). or, The sub-conductors (200) in each of the first conductor groups (20a) are arranged in the order in which they are inserted into the winding slots as follows: the first conductor (201), the third conductor (203), and the second conductor (202). Similarly, the sub-conductors (200) in each of the second conductor groups (20b) are arranged in the order in which they are inserted into the winding slots as follows: the second conductor (202), the fourth conductor (204), and the third conductor (203). or, The sub-conductors (200) in each of the first conductor groups (20a) are arranged in the order in which they are inserted into the winding slots as follows: the first conductor (201), the third conductor (203), and the second conductor (202). The sub-conductors (200) in each of the second conductor groups (20b) are arranged in the order in which they are inserted into the winding slots as follows: the fifth conductor (205), the second conductor (202), and the first conductor (201).
3. The stator of the flat wire motor according to claim 2, characterized in that, For each phase of the flat wire stator winding (20), within each branch, the span between adjacent sub-conductors (200) on the series path, except at the first and second type nodes, is K. The first type of node is located between two sub-conductors (200) that are adjacent in the series path and have opposite series directions in the circumferential direction (C) at the innermost or outermost radial layer. The span between the two sub-conductors (200) at the first type of node is K+1 or K-1. The second type of node is located between two sub-conductors (200) that are adjacent on the serial path and are located on the Mth and M+1th layers respectively. The span between the two sub-conductors (200) at the second type of node is either K+1 or K-1, or the span between the two sub-conductors (200) at the second type of node is either K+2 or K-2.
4. The stator of the flat wire motor according to claim 3, characterized in that, In the case where the second conductor group (20b) includes the second conductor (202), the third conductor (203), and the fourth conductor (204), the span between the two sub-conductors (200) at the second type of node is K+1. In the case where the second conductor group (20b) includes the first conductor (201), the second conductor (202) and the fifth conductor (205), the span between the two sub-conductors (200) at the second type node is K-1.
5. The stator of the flat wire motor according to claim 4, characterized in that, When viewed along the circumferential direction (C) of the stator core (10), The sub-conductors (200) within each of the first conductor groups (20a) are arranged in the following order according to the winding slots into which they are inserted: the second conductor (202), the first conductor (201), and the third conductor (203), and, The sub-conductors (200) within each of the second conductor groups (20b) are arranged in the order in which they are inserted into the winding slots as follows: the third conductor (203), the second conductor (202), and the fourth conductor (204), or The sub-conductors (200) in each of the second conductor groups (20b) are arranged in the order in which they are inserted into the winding slots as follows: the first conductor (201), the fifth conductor (205), and the second conductor (202). Furthermore, for each of the aforementioned branches, at the first type of node, if one of the second conductors (202) is directly connected in series with the first conductor (201), In each phase of the flat wire stator winding (20), the span between the two sub-conductors (200) at the first type node of one branch is K+1, and the span between the two sub-conductors (200) at the first type node of the other branch is K-1.
6. The stator of the flat wire motor according to claim 4, characterized in that, When viewed along the circumferential direction (C) of the stator core (10), The sub-conductors (200) within each of the first conductor groups (20a) are arranged in the following order according to the winding slots into which they are inserted: the second conductor (202), the first conductor (201), and the third conductor (203), and, The sub-conductors (200) within each of the second conductor groups (20b) are arranged in the order in which they are inserted into the winding slots as follows: the third conductor (203), the second conductor (202), and the fourth conductor (204), or The sub-conductors (200) in each of the second conductor groups (20b) are arranged in the order in which they are inserted into the winding slots as follows: the first conductor (201), the fifth conductor (205), and the second conductor (202). Furthermore, for each of the branches, at the first type of node, if one of the second conductors (202) and the third conductor (203) are directly connected in series, In each phase of the flat wire stator winding (20), the span between the two sub-conductors (200) at the first type node of one branch is K+2, and the span between the two sub-conductors (200) at the first type node of the other branch is K-2.
7. The stator of the flat wire motor according to claim 4, characterized in that, When viewed along the circumferential direction (C) of the stator core (10), The sub-conductors (200) within each of the first conductor groups (20a) are arranged in the order in which they are inserted into the winding slots as follows: the first conductor (201), the third conductor (203), and the second conductor (202), and, The sub-conductors (200) within each of the second conductor groups (20b) are arranged in the order in which they are inserted into the winding slots as follows: the second conductor (202), the fourth conductor (204), and the third conductor (203), or The sub-conductors (200) in each of the second conductor groups (20b) are arranged in the order in which they are inserted into the winding slots as follows: the fifth conductor (205), the second conductor (202) and the first conductor (201). Furthermore, for each of the aforementioned branches, at the first type of node, if one of the second conductors (202) is directly connected in series with the first conductor (201), In each phase of the flat wire stator winding (20), the span between the two sub-conductors (200) at the first type node of one branch is K+2, and the span between the two sub-conductors (200) at the first type node of the other branch is K-2.
8. The stator of the flat wire motor according to claim 4, characterized in that, When viewed along the circumferential direction (C) of the stator core (10), The sub-conductors (200) within each of the first conductor groups (20a) are arranged in the order in which they are inserted into the winding slots as follows: the first conductor (201), the third conductor (203), and the second conductor (202), and, The sub-conductors (200) within each of the second conductor groups (20b) are arranged in the order in which they are inserted into the winding slots as follows: the second conductor (202), the fourth conductor (204), and the third conductor (203), or The sub-conductors (200) in each of the second conductor groups (20b) are arranged in the order in which they are inserted into the winding slots as follows: the fifth conductor (205), the second conductor (202) and the first conductor (201). Furthermore, for each of the aforementioned branches, at the first type of node, if one of the second conductors (202) is directly connected in series with the first conductor (201), In each phase of the flat wire stator winding (20), the span between the two sub-conductors (200) at the first type node of one branch is K+1, and the span between the two sub-conductors (200) at the first type node of the other branch is K-1.
9. The stator of the flat wire motor according to any one of claims 1 to 8, characterized in that, The value of K is 9.
10. The stator of the flat wire motor according to any one of claims 1 to 8, characterized in that, The outgoing and leading ends of each branch are located in the outermost radial layer, or The outgoing and incoming ends of each branch are located in the innermost radial layer.