Stator for a flat wire motor and flat wire motor

Abstract

The application provides a stator of a flat wire motor and the flat wire motor, the slot number of each pole and each phase of the stator is 3, the pole number of the stator is an even multiple of 3, the layer number formed by the flat wire stator winding in the winding slot is 2M, M is an even number greater than or equal to 2; the winding comprises a three-phase winding, each phase winding comprises two parallel branches, each branch is formed by a plurality of U-shaped sub-conductors in series; each phase winding comprises a plurality of conductor groups, each conductor group comprises three sub-conductors, and the span is K+1, K and K-1 respectively; each sub-conductor spans two adjacent layers, which are the 2N layer and the 2N-1 layer respectively; the slots occupied by the sub-conductor are in the M layers located on the radial inner side, three continuous inner slots are occupied by each pole and each phase, three continuous outer slots are occupied by each pole and each phase in the M layers located on the radial outer side, and the three inner slots and the three outer slots of each pole and each phase are staggered by one slot position in the circumferential direction. According to the stator structure, the manufacturing cost is low, the harmonic influence is small, and the working performance is good.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of electric machines, in particular to a stator of a flat wire electric machine using flat wire as winding and a flat wire electric machine. BACKGROUND

[0002] Taking the electric machine of a new energy vehicle as an example, the stator of the electric machine using flat wire as winding has a high copper fill rate, which can improve the power density of the electric machine.

[0003] However, the flat wire winding has poor flexibility in the arrangement mode compared with the round wire winding, and how to arrange the flat wire winding according to the needs of various performances of the electric machine, so that the winding structure is simple, the manufacturing cost is low, and the electric machine has good working performance (for example, smaller harmonic interference), is a problem to be solved in the field.

[0004] Especially for the flat wire winding with 3 slots per pole per phase q, 3 times of an even number of pole number 2P, and 2 branches in parallel, the winding mode in the prior art is complex. For example, the outgoing ends of each branch are spaced apart by a large interval (even up to 180°) in the circumferential direction of the stator, which makes the arrangement of the busbar complex; or the space occupied by one end of the winding is large, which makes the installation of the rotor have certain limitations. SUMMARY

[0005] The present application aims to overcome or at least alleviate the deficiencies of the prior art, and to provide a stator of a flat wire electric machine and a flat wire electric machine.

[0006] According to a first aspect of the present application, a stator of a flat wire electric machine is provided, comprising a stator core and a flat wire stator winding, wherein,

[0007] The number of winding slots per pole per phase of the stator is 3, the number of poles of the stator is an even multiple of 3, and the flat wire stator winding forms 2M layers in the winding slots, M is an even number greater than or equal to 2,

[0008] The flat wire stator winding includes a three-phase winding, the flat wire stator winding of each phase includes 2 parallel branches, each branch is formed by a plurality of U-shaped sub-conductors in series,

[0009] The flat wire stator winding of each phase includes a plurality of conductor groups, each conductor group includes 3 sub-conductors, which are a first conductor, a second conductor and a third conductor,

[0010] The span of the first conductor is K+1, the span of the second conductor is K, and the span of the third conductor is K-1, K is a positive integer,

[0011] In each of the conductor groups, the sub-conductors are arranged in the order of the winding slots in which they are inserted, as viewed in the circumferential direction of the stator core, as: the second conductor, the first conductor, and the third conductor, or as: the first conductor, the third conductor, and the second conductor,

[0012] Each of the sub-conductors spans two adjacent layers, the two adjacent layers being the 2N layer and the 2N-1 layer respectively, N being a positive integer,

[0013] The sub-conductors occupy slots in the M layers on the radially inner side, three consecutive inner winding slots per pole per phase, and in the M layers on the radially outer side, three consecutive outer winding slots per pole per phase, the three inner winding slots and the three outer winding slots per pole per phase being staggered by one slot position in the circumferential direction.

[0014] In at least one embodiment, for the flat wire stator winding of each phase, in each of the branches, the span between the sub-conductors adjacent in the series path, except at the first type of node and the second type of node, is K,

[0015] The first type of node is located between two sub-conductors adjacent in the series path and on the radially innermost layer or the radially outermost layer, the series paths of the two sub-conductors being opposite in the circumferential direction, the span between the two sub-conductors at the first type of node being K+1 or K-1, or, the span between the two sub-conductors at the first type of node being K+2 or K-2,

[0016] The second type of node is located between two sub-conductors adjacent in the series path and on the M layer and the M+1 layer respectively, the span between the two sub-conductors at the second type of node being K+1 or K-1.

[0017] In at least one embodiment, for the flat wire stator winding of each phase, in each of the branches, all the second conductors are connected in series one after another, and the first conductors and the third conductors are connected in series with intervals.

[0018] In at least one embodiment, in the case of “In each of the conductor groups, the sub-conductors are arranged in the order of the winding slots in which they are inserted, as viewed in the circumferential direction of the stator core, as: the second conductor, the first conductor, and the third conductor”,

[0019] And for each of the branches, in the case where one of the second conductors is directly connected in series with the first conductor,

[0020] In the flat wire stator winding of each phase, the span between two of the sub-conductors at the first type node of one of the branches is K+1, and the span between two of the sub-conductors at the first type node of the other of the branches is K-1.

[0021] In at least one embodiment, where "in each of the conductor groups, the sub-conductors are arranged in the order of the sequence in which they are inserted into the winding slots as follows: the second conductor, the first conductor, and the third conductor, as viewed in the circumferential direction of the stator core",

[0022] and for each of the branches, where one of the second conductors is directly in series with the third conductor,

[0023] In the flat wire stator winding of each phase, the span between two of the sub-conductors at the first type node of one of the branches is K+2, and the span between two of the sub-conductors at the first type node of the other of the branches is K-2.

[0024] In at least one embodiment, where "in each of the conductor groups, the sub-conductors are arranged in the order of the sequence in which they are inserted into the winding slots as follows: the first conductor, the third conductor, and the second conductor, as viewed in the circumferential direction of the stator core",

[0025] and for each of the branches, where one of the second conductors is directly in series with the first conductor,

[0026] In the flat wire stator winding of each phase, the span between two of the sub-conductors at the first type node of one of the branches is K+2, and the span between two of the sub-conductors at the first type node of the other of the branches is K-2.

[0027] In at least one embodiment, where "in each of the conductor groups, the sub-conductors are arranged in the order of the sequence in which they are inserted into the winding slots as follows: the first conductor, the third conductor, and the second conductor, as viewed in the circumferential direction of the stator core",

[0028] and for each of the branches, where one of the second conductors is directly in series with the third conductor,

[0029] In the flat wire stator winding of each phase, the span between two of the sub-conductors at the first type node of one of the branches is K+1, and the span between two of the sub-conductors at the first type node of the other of the branches is K-1.

[0030] In at least one embodiment, the value of K is 9.

[0031] In at least one embodiment, the outlet and lead ends of each branch are located in the outermost radial layer, or

[0032] The outgoing and incoming ends of each branch are located in the innermost radial layer.

[0033] According to a second aspect of the invention, a flat wire motor is provided, comprising a rotor and a stator of the flat wire motor according to a first aspect of the invention.

[0034] The stator structure according to the present invention is compact, has low manufacturing cost, minimal harmonic interference during operation, and good performance. The flat wire motor according to the present invention has the same advantages. Attached Figure Description

[0035] Figure 1 This is a schematic diagram of a stator according to one embodiment of the present invention.

[0036] Figure 2 This is a schematic diagram of a possible two-branch three-phase winding using a star connection.

[0037] Figure 3 This is a schematic diagram of a possible two-branch three-phase winding connected in a delta configuration.

[0038] Figure 4 This is a schematic diagram of a flat wire stator winding according to an embodiment of the present invention.

[0039] Figure 5 This is a schematic diagram of one phase of a winding according to an embodiment of the present invention.

[0040] Figure 6 This is a front view schematic diagram of a sub-conductor according to one embodiment of the present invention.

[0041] Figure 7 yes Figure 6 A top view of a neutron conductor.

[0042] 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.

[0043] 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.

[0044] Figure 11 This is a schematic diagram of the wiring configuration of a phase winding according to the first embodiment of the present invention.

[0045] Figure 12is a schematic diagram of a wiring pattern of a phase winding according to a second embodiment of the present application.

[0046] Figure 13 is a schematic diagram of a wiring pattern of a phase winding according to a third embodiment of the present application.

[0047] Figure 14 is a schematic diagram of a wiring pattern of a phase winding according to a fourth embodiment of the present application.

[0048] Figure 15 is a schematic diagram of a wiring pattern of a phase winding according to a fifth embodiment of the present application.

[0049] Figure 16 is a schematic diagram of a winding connection at a neutral point using an auxiliary conductor according to another embodiment of the present application.

[0050] BRIEF DESCRIPTION OF DRAWINGS

[0051] 10 stator core; 20 flat wire stator winding; 21 crown end; 21a fold; 22 solder end; 200 sub-conductor; 201 first conductor; 202 second conductor; 203 third conductor; 200f auxiliary conductor; 30 outgoing copper bar. DETAILED DESCRIPTION

[0052] Exemplary embodiments of the present application will be described below with reference to the accompanying drawings. It should be understood that the specific description is merely for the purpose of teaching one skilled in the art how to practice the present application, and is not intended to limit the scope of the present application in any way.

[0053] Reference Signs List Figures 1 to 16 , a stator of a flat wire motor according to the present application is introduced. Unless otherwise specified, reference is made to Figure 1 , A denotes the axial direction of the stator, R denotes the radial direction of the stator, and C denotes the circumferential direction of the stator.

[0054] The stator according to the present application comprises a stator core 10, a flat wire stator winding 20 (hereinafter also referred to as winding 20) and an outgoing copper bar 30.

[0055] The inner periphery of the stator core 10 is formed with wire slots (hereinafter also referred to as slots) extending in the axial direction A, the number of slots per pole per phase q is 3, and the number of poles 2P of the stator is an even multiple of 3. In the present embodiment, the number of poles 2P = 6, so that the total number of wire slots is 54. It should be understood that in other possible embodiments, the number of wire slots will change accordingly as the number of poles 2P changes.

[0056] As shown in Figure 2 and Figure 3 , each phase winding comprises 2 parallel branches. The three-phase winding may, for example, be as shown in Figure 2The sub-conductors 200 are connected to form a star shape, or alternatively, a triangle shape as shown in Figure 3

[0057] The number of layers formed by the windings in the slot in the radial direction R is 2M, where M is an even number greater than or equal to 2, i.e. the number of layers can be 4, 8, 12, etc.

[0058] The winding 20 of each phase includes a plurality of conductor groups, each of which includes three sub-conductors 200.

[0059] Referring to Figure 5 , the sub-conductors 200 are divided into first conductors 201, second conductors 202 and third conductors 203 according to the distance (hereinafter referred to as the span) between the two leg portions of each sub-conductor 200. The span of the first conductors 201 is K+1, the span of the second conductors 202 is K, and the span of the third conductors 203 is K-1, where K is a positive integer, taking the difference between the slot position numbers of the two slots in which the two leg portions of the sub-conductor 200 are inserted in the circumferential direction C as the measure of the span.

[0060] Referring to Figure 6 , each sub-conductor 200 is substantially U-shaped, with one end thereof connected in the axial direction A to form a crown end 21, and the other end bifurcated to form a welding end 22. The two leg portions of each sub-conductor 200 extending in the axial direction A are used to be inserted into the slots.

[0061] Figure 7 A schematic view of the sub-conductor 200 from above is shown. Since each sub-conductor 200 is cross-layered, i.e. the two leg portions of each sub-conductor 200 are located in different layers, a fold 21a is formed in the crown end 21 of the sub-conductor 200 in this embodiment, which allows the two leg portions of the sub-conductor 200 to be staggered in the radial direction R. The cross-layering of the sub-conductor 200 also allows the sub-conductor 200, especially the sub-conductor 200 located in the radially innermost layer, to occupy less radial space, so that the winding 20 has a larger inner diameter at the end, facilitating the installation of the rotor.

[0062] For each sub-conductor 200, it spans two adjacent layers, i.e. the two leg portions of the sub-conductor 200 are inserted into different slots in adjacent layers, and the two adjacent layers are the 2N layer and the 2N-1 layer respectively, where N is a positive integer.

[0063] (First Embodiment)

[0064] Next, referring to Figure 10 and Figure 11 , a stator according to the first embodiment of the present application is described by way of example of a stator in which a four-layer structure is formed in the slots. For the sake of convenience of description, one phase, for example the U phase, is taken as an example, and the arrangement of each sub-conductor 200 is described in detail.

[0065] Referring to​Figure 10 In the following description, different layers in the slot are denoted by lower-case English letters a, b, c, d, which represent the 1st, 2nd, 3rd, 4th layers from the radially outer side to the radially inner side respectively. It should be understood that the layers in the slot are a virtual concept, such layers are formed due to the stacking of the leg portions of the plurality of sub-conductors 200, and when no sub-conductor 200 is arranged in the slot, there is no layered structure in the slot.

[0066] In the present embodiment, the winding 20 of each phase includes 12 conductor groups. In each conductor group, the span of the first conductor 201, the second conductor 202 and the third conductor 203 is 10, 9 and 8 respectively, i.e. the aforementioned K = 9.

[0067] When viewed along the circumferential direction C of the stator core 10, the sub-conductors 200 in each conductor group are arranged in the order of the slot in which they are inserted as: the second conductor 202, the first conductor 201 and the third conductor 203.

[0068] This arrangement order cooperates with the span of the three sub-conductors 200, so that the leg portions of the two sides of the three sub-conductors 200 of each conductor group are located in three consecutive slots respectively. For example, Figure 11 In the first pole, the three sub-conductors 200 of one conductor group located in the c layer and the d layer from the 4th slot, the three leg portions of one side occupy the d layer of the slot 4, the slot 5 and the slot 6 respectively, and the leg portions of the other side occupy the c layer of the slot 13, the slot 14 and the slot 15 respectively.

[0069] The conductor groups located in the two layers on the radially inner side (i.e. the c layer and the d layer) are staggered by one slot position in the circumferential direction C from the conductor groups located in the two layers on the radially outer side (i.e. the a layer and the b layer). Or in other words, in the M layers on the radially inner side, each pole and each phase occupies three consecutive inner side slots; in the M layers on the radially outer side, each pole and each phase occupies three consecutive outer side slots; the three inner side slots and the three outer side slots of each pole and each phase are staggered by one slot position in the circumferential direction.

[0070] For example, Figure 11 In the first pole, the three inner side slots are the slot 4, the slot 5 and the slot 6 in the c layer and the d layer, and the three outer side slots are the slot 3, the slot 4 and the slot 5 in the a layer and the b layer, which are staggered by one slot position in the circumferential direction as a whole.

[0071] This staggered arrangement between layers, or the staggered arrangement of the slot positions occupied by different layers in the circumferential direction C, can reduce the winding harmonics, thereby reducing the NVH during operation of the motor.

[0072] According to the above rules, the positions of each conductor group in each slot and each layer are determined. The specific direction of each branch, i.e. the series connection order of each sub-conductor 200 of each branch, is achieved by selecting appropriate adjacent legs of adjacent sub-conductors 200 to be electrically connected (for example, in the present embodiment, two legs are welded at the welding end 22).

[0073] For the convenience of description, the arrangement of the two legs of each sub-conductor 200 in different slots and different layers is represented by similar symbols as follows:

[0074] First conductor 201: { *a-*b};

[0075] Second conductor 202: [ *a-*b ];

[0076] Third conductor 203: ( *a-*b );

[0077] Wherein, * represents the slot number, and a / b represents the layer number in the slot.

[0078] For example, {5d-15c} represents that the two legs (with a span of 10) of the first conductor 201 are respectively arranged in the d layer of the 5th slot and the c layer of the 15th slot, [4d-13c] represents that the two legs (with a span of 9) of the second conductor 202 are respectively arranged in the d layer of the 4th slot and the c layer of the 13th slot, and (6d-14c) represents that the two legs (with a span of 8) of the third conductor 203 are respectively arranged in the d layer of the 6th slot and the c layer of the 14th slot.

[0079] The connection of the welding end 22 follows the following rules:

[0080] In each branch, the span between adjacent sub-conductors 200 in the series connection path is K=9, except at the first type of node (hereinafter also referred to as the reverse twist node) and the second type of node (hereinafter also referred to as the staggered node).

[0081] Wherein, the reverse twist node is located between two sub-conductors 200 in the radial innermost layer or the radial outermost layer, which are adjacent in the series connection path and have opposite series connection directions in the circumferential direction C. The span between the two sub-conductors 200 at the reverse twist node is K+1=10 or K-1=8; or more specifically, the span between the two sub-conductors 200 at the reverse twist node of one branch is 10, and the span between the two sub-conductors 200 at the reverse twist node of the other branch is 8.

[0082] In this embodiment, the outgoing end of each branch is located at layer a. For example, observing the first branch from the 21st slot at layer a as the starting point, the sub-conductor 200 of the first branch first crosses in the direction in which the slot number decreases (defined as the counterclockwise direction) and the layer number increases, for example, the second conductor 202{21a-12b} crosses from the 21st slot to the 12th slot and from layer a to layer b. In this order, the series-connected sub-conductors 200 of the first branch first circumferentially pass through layers a and b in the counterclockwise direction (in the direction in which the layer number increases from layer a to layer b), then extend to layers c and d (in the direction in which the layer number increases from layer c to layer d) and circumferentially pass through layers c and d in the counterclockwise direction, then encounter the reverse-twist node, start circumferentially passing through layers c and d in the clockwise direction (in the direction in which the layer number decreases from layer d to layer c), then extend to layers a and b (in the direction in which the layer number decreases from layer b to layer a) and circumferentially pass through layers a and b in the clockwise direction, until the outgoing end of the first branch. The reverse-twist node is located at the radially innermost layer opposite the outgoing end (the radially outermost layer).

[0083] The adjacent legs of the two adjacent sub-conductors 200 at the reverse-twist node are located at the same layer, which is layer d in this embodiment.

[0084] The staggered node is located between the two sub-conductors 200 that are adjacent in the series connection path and are located at the M=2nd layer and the M+1=3rd layer, respectively. The span between the two sub-conductors 200 at the staggered node is K-1=8.

[0085] According to the span rule of the welding end 22 described above, the arrangement order of the sub-conductors of the first branch in this embodiment will be: [1st second conductor 202]-[2nd second conductor 202]-[3rd second conductor 202]-[4th second conductor 202]-[5th second conductor 202]-[6th second conductor 202]-{1st first conductor 201}-(1st third conductor 203)-{2nd first conductor 201}-(2nd third conductor 203)-{3rd first conductor 201}-(3rd third conductor 203)-{4th first conductor 201}-(4th third conductor 203)-{5th first conductor 201}-(5th third conductor 203)-{6th first conductor 201}-(6th third conductor 203).

[0086] That is, the six second conductors 202 of the first branch are sequentially connected in series, the remaining first conductors 201 and third conductors 203 are connected in series with each other at intervals, and one of the second conductors 202 is connected in series with the third conductors 203.

[0087] Specifically, the arrangement of the sub-conductors 200 of the first branch is as follows:

[0088] Lead end - [21a-12b] - [3a-48b] - [39a-30b] =

[0089] [22c-13d] - [4c-49d] - [40c-31d] ~

[0090] {41d-51c} - (6d-14c) - {23d-33c} - (42d-50c) - {5d-15c} - (24d-32c) =

[0091] {40b-50a} - (5b-13a) - {22b-32a} - (41b-49a) - {4b-14a} - (23b-31a) - Lead end

[0092] It should be understood that the above is intentionally displayed in different rows for the convenience of the reader to observe the placement of the sub-conductor 200 between different adjacent layers, and to observe the different arrangements before and after the reverse twist node. In fact, the sub-conductors 200 located in different rows are still connected in series.

[0093] The place marked with "~" in the above series arrangement represents the reverse twist node. As can be seen, the 6th second conductor 202, i.e. one leg of [40c-31d] is in slot 31, and the 1st first conductor 201, i.e. one leg of {41d-51c} is in slot 41. The span between the soldering ends of the two legs is 10, i.e. the reverse twist span at this point is 10.

[0094] The method of changing the span of adjacent legs at the soldering end 22 can refer to Figure 8 and Figure 9 By folding the soldering end 22 of one of the legs, for example, to the outer circumferential side, the span of the soldering end 22 can be changed.

[0095] The place marked with "=" in the above series arrangement represents the misalignment node. As can be seen, the misalignment node occurs between layer c and layer b, specifically, the misalignment node is located between the number 6 and 7, and between the number 24 and 25, and the misalignment span is 8.

[0096] The first branch corresponds to Figure 11The underlined and bolded number indexes represent the serial order; the column and row numbers where each number index is located represent the slot and layer number where each leg of the sub-conductor 200 is inserted, respectively. For example, the number indexes 1, 2, 3, 4 are located at slot 21a layer, slot 12b layer, slot 3a layer and slot 48b layer, respectively, which means that the four legs are located at slot 21a layer, slot 12b layer, slot 3a layer and slot 48b layer, respectively, in the serial order. Corresponding to the above sequence, the 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.

[0097] Next, the second phase branch is introduced. The outgoing end of the second phase branch is located at the adjacent slot of the outgoing end of the first phase branch, i.e. slot 22.

[0098] When selecting the type of the sub-conductor 200, the arrangement of the type of the sub-conductor 200 is just opposite to that of the first phase branch, in the serial order from the outgoing end to the lead end.

[0099] The second phase branch:

[0100] Outgoing end-(22a-14b)-{5a-49b}-(40a-32b)-{23a-13b}-(4a-50b)-{41a-31b}-

[0101] (23c-15d)-{6c-50d}-(41c-33d)-{24c-14d}-(5c-51d)-{42c-32d}-

[0102] [40d-49c]-[4d-13c]-[22d-31c]=

[0103] [39b-48a]-[3b-12a]-[21b-30a]-Lead end

[0104] The second phase branch corresponds to Figure 11 The non-underlined and slanted number indexes. It can be seen that the anti-twist node of the second phase branch is located between the number indexes 24 and 25, and the anti-twist span is 8.

[0105] The misalignment nodes are located between the number indexes 12 and 13, and between the number indexes 30 and 31, and the misalignment span is 8.

[0106] From Figure 11As can be seen intuitively, according to this wiring mode, the outgoing ends of the two branches are located in adjacent slots, and the lead-in ends of the two branches are also located in adjacent slots, and the outgoing ends and the lead-in ends of the two branches are located in adjacent two poles. In this way, the ends of all branches are located in a very small range on the circumference C, so that the structure of the outgoing copper bar is very compact and saves materials.

[0107] (Second Embodiment)

[0108] Reference Figure 12 The second embodiment of the present application is introduced. The second embodiment is a variation of the first embodiment, and the same reference numerals are assigned to the components identical or similar to those in the first embodiment, and the specific description of these components is omitted.

[0109] The main difference between the present embodiment and the first embodiment is that the slot position offset directions of the b layer and the c layer when being staggered are different.

[0110] In the first embodiment, the three inner side winding slots (the winding slots located in the c layer and the d layer) of each pole and each phase are one slot position behind the three outer side winding slots (the winding slots located in the a layer and the b layer) in the circumferential direction; while in the present embodiment, the three inner side winding slots (the winding slots located in the c layer and the d layer) of each pole and each phase are one slot position ahead of the three outer side winding slots (the winding slots located in the a layer and the b layer) in the circumferential direction.

[0111] This staggered mode makes the span at the staggered node become K+1=10.

[0112] Since other wiring rules are similar to the first embodiment, only the wiring sequence of the two branches is briefly described below.

[0113] First branch:

[0114] Outgoing end - [22a-13b] - [4a-49b] - [40a-31b] =

[0115] [21c-12d] - [3c-48d] - [39c-30d] ~

[0116] {40d-50c} - (5d-13c) - {22d-32c} - (41d-49c) - {4d-14c} - (23d-31c) =

[0117] {41b-51a} - (6b-14a) - {23b-33a} - (42b-50a) - {5b-15a} - (24b-32a) - lead-in end

[0118] Second branch:

[0119] outlet end - (23a-15b) - {6a-50b} - (41a-33b) - {24a-14b} - (5a-51b) - {42a-32b}=

[0120] (22c-14d) - {5c-49d} - (40c-32d) - {23c-13d} - (4c-50d) - {41c-31d} ~

[0121] [39d-48c] - [3d-12c] - [21d-30c] =

[0122] [40b-49a] - [4b-13a] - [22b-31a] - lead end

[0123] (Third Embodiment)

[0124] Reference Figure 13 A third embodiment of the present application will be described. The third embodiment is a modification of the first embodiment, and the same reference numerals are assigned to components identical or similar to those in the first embodiment, and detailed description thereof will be omitted.

[0125] The main difference between the present embodiment and the first embodiment is that, in the first embodiment, in each branch of each phase, one of the second conductors 202 is selected to be connected in series with the third conductor 203, while in the present embodiment, one of the second conductors 202 is selected to be connected directly to the third conductor 203.

[0126] In correspondence with this connection order, in the present embodiment, the span at the antinodes of one branch is K+2 = 11, and the span at the antinodes of the other branch is K-2 = 7.

[0127] Specifically, the wiring order of the two branches is as follows:

[0128] First branch:

[0129] outlet end - [21a-12b] - [3a-48b] - [39a-30b] =

[0130] [22c-13d] - [4c-49d] - [40c-31d] ~

[0131] (42d-50c) - {5d-15c} - (24d-32c) - {41d-51c} - (6d-14c) - {23d-33c} =

[0132] (41b-49a) - {4b-14a} - (23b-31a) - {40b-50a} - (5b-13a) - {22b-32a} - lead end

[0133] Second branch:

[0134] outlet end - {23a-13b} - (4a-50b) - {41a-31b} - (22a-14b) - {5a-49b} - (40a-32b) =

[0135] {24c-14d} - (5c-51d) - {42c-32d} - (23c-15d) - {6c-50d} - (41c-33d)

[0136] [40d-49c] - [4d-13c] - [22d-31c] =

[0137] [39b-48a] - [3b-12a] - [21b-30a] - lead end

[0138] (Fourth embodiment)

[0139] Reference Figure 14 A fourth embodiment of the present application will be described. The fourth embodiment is a modification of the first embodiment, and the same reference numerals are assigned to components identical or similar to those in the first embodiment, and detailed description of these components will be omitted.

[0140] The main difference between the present embodiment and the first embodiment is that, as viewed in the circumferential direction C of the stator core 10, the sub-conductors 200 within each conductor group are arranged in the order of the winding slots into which they are inserted as: the first conductor 201, the third conductor 203, and the second conductor 202.

[0141] In correspondence with this connection order, in the present embodiment, the span at the anti-twist node of one branch is K+2 = 11, and the span at the anti-twist node of the other branch is K-2 = 7.

[0142] Specifically, the wiring order of the two branches is:

[0143] First branch:

[0144] outlet end - (21a-13b) - {4a-48b} - (39a-31b) - {22a-12b} - (3a-49b) - {40a-30b} =

[0145] (22c-14d) - {5c-49d} - (40c-32d) - {23c-13d} - (4c-50d) - {41c-31d}

[0146] [42d-51c] - [6d-15c] - [24d-33c] =

[0147] [41d-50c]-[5d-14c]-[23d-32c]-lead end

[0148] Second branch:

[0149] lead end-[23a-14b]-[5a-50b]-[41a-32b]=

[0150] [24c-15d]-[6c-51d]-[42c-33d]

[0151] {40d-50c}-(5d-13c)-{22d-32c}-(41d-49c)-{4d-14c}-(23d-31c)=

[0152] {39b-49a}-(4b-12a)-{21b-31a}-(40b-48a)-{3b-13a}-(22b-30a)-lead end

[0153] (Fifth Embodiment)

[0154] Reference Figure 15 The fifth embodiment of the present application is described. The fifth embodiment is a modification of the first embodiment, the third embodiment and the fourth embodiment, and the same reference numerals are assigned to the components having the same or similar structures or functions as those in the first embodiment, and the detailed description of these components is omitted.

[0155] The main difference between the present embodiment and the first embodiment is that:

[0156] First, as viewed in the circumferential direction C of the stator core 10, the sub-conductors 200 in each conductor group are arranged in the order of the first conductor 201, the third conductor 203 and the second conductor 202 in the order of the winding slots in which they are inserted.

[0157] Second, for each branch of each phase, one of the second conductors 202 is selected to be directly connected to the third conductor 203 when connected in series with the other conductors.

[0158] The simultaneous change of the above two rules results in the connection order being adapted as follows. In the present embodiment, the span at the anti-twist node of one branch is K+1=10, and the span at the anti-twist node of the other branch is K-1=8 (the same as in the first embodiment).

[0159] Specifically, the wiring order of the two branches is as follows:

[0160] First branch:

[0161] outlet end - {22a-12b} - (3a-49b) - {40a-30b} - (21a-13b) - {4a-48b} - (39a-31b) =

[0162] {23c-13d} - (4c-50d) - {41c-31d} - (22c-14d) - {5c-49d} - (40c-32d) ~

[0163] [42d-51c] - [6d-15c] - [24d-33c] =

[0164] [41b-50a] - [5b-14a] - [23b-32a] - lead end

[0165] Second branch:

[0166] outlet end - [23a-14b] - [5a-50b] - [41a-32b] =

[0167] [24c-15d] - [6c-51d] - [42c-33d] ~

[0168] (41d-49c) - {4d-14c} - (23d-31c) - {40d-50c} - (5d-13c) - {22d-32c} =

[0169] (40b-48a) - {3b-13a} - (22b-30a) - {39b-49a} - (4b-12a) - {21b-31a} - lead end

[0170] It should be understood that the above-mentioned embodiments and parts of aspects or features thereof can be appropriately combined. For example:

[0171] The second embodiment can be modified with reference to the third to fifth embodiments, specifically including the following three modifications.

[0172] The first modification: in each branch of each phase, one of the second conductors 202 is directly connected to the third conductor 203 in series with the other conductors. In this connection order, the span at the counter-twist node of one branch is K+2=11, and the span at the counter-twist node of the other branch is K-2=7 in this modification. The span at the staggered node is K+1=10.

[0173] Second variant: as viewed in the circumferential direction C of the stator core 10, the sub-conductors 200 in each conductor group are arranged in the order of the winding slots into which they are inserted as: first conductor 201, third conductor 203 and second conductor 202. In this variant, the span at the anti-twist node of one branch is K+2=11, and the span at the anti-twist node of the other branch is K-2=7. The span at the misalignment node is K+1=10 in each case.

[0174] Third variant: firstly, as viewed in the circumferential direction C of the stator core 10, the sub-conductors 200 in each conductor group are arranged in the order of the winding slots into which they are inserted as: first conductor 201, third conductor 203 and second conductor 202; secondly, in each branch of each phase, one of the second conductors 202 is connected directly to the third conductor 203 when connected in series with the other conductors. In this variant, the span at the anti-twist node of one branch is K+1=10, and the span at the anti-twist node of the other branch is K-1=8. The span at the misalignment node is K+1=10 in each case.

[0175] The present application has at least one of the following advantages:

[0176] (i) Each sub-conductor 200 spans two layers, so that the sub-conductors 200, especially the sub-conductors 200 located radially innermost, do not occupy too much space in the radial direction, so that the winding 20 has a large inner diameter at the end, facilitating the installation of the rotor.

[0177] (ii) The outgoing end and the lead end of the winding of the two branches of each phase are spaced apart in the circumferential direction C, so that the structure is compact and simple, and the branch winding is spatially symmetrical and does not generate loop currents.

[0178] (iii) The radial inner M layers and the radial outer M layers of the slot positions of each pole per phase conductor are arranged in a staggered manner in the circumferential direction, which can reduce harmonic effects and reduce noise.

[0179] Of course, the present application is not limited to the above-described embodiments, and those skilled in the art can make various modifications to the above-described embodiments of the present application under the teaching of the present application without departing from the scope of the present application. For example:

[0180] (i) The outgoing end and the lead end in the above embodiments can be interchanged;

[0181] (ii) The outgoing end and the lead end in the above embodiments are placed on the radially outermost layer, while the anti-twist node is placed on the radially innermost layer, however, this is not necessary, for example, the outgoing end and the lead end can be located on the radially innermost layer, while the anti-twist node is located on the radially outermost layer;

[0182] (iii) The slot numbers selected for each pole per phase in the above embodiments can be translated as a whole in the circumferential direction C.

[0183] (iv) For the connection of the weld end 22 under the back-torque span, in addition to changing the span between the legs of adjacent sub-conductors 200 at the weld end 22 by folding the sub-conductor 200 over as in Figure 8 and Figure 9 , other auxiliary conductors 200f (also referred to as busbars) can be used to electrically connect the legs of adjacent sub-conductors 200, for example, with reference to Figure 16 .

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 even number greater than or equal to 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 multiple conductor groups, and each conductor group includes three sub-conductors (200), namely a first conductor (201), a second conductor (202), and a third conductor (203). The span of the first conductor (201) is K+1, the span of the second conductor (202) is K, and the span of the third conductor (203) is K-1, where K is a positive integer. Viewed along the circumference (C) of the stator core (10), the sub-conductors (200) within each conductor group 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), or the first conductor (201), the third conductor (203), and the second conductor (202). 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 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. 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 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 first type of node is K+1 or K-1, or the span between the two sub-conductors (200) at the first type of node is K+2 or K-2. The second type of node is located between two sub-conductors (200) that are adjacent on the serial path and are located in the Mth layer and the M+1th layer respectively, and the span between the two sub-conductors (200) at the second type of node is either K+1 or K-1.

2. The stator of the flat wire motor according to claim 1, characterized in that, For each phase of the flat wire stator winding (20), in each branch, all the second conductors (202) are connected in series, and the first conductor (201) and the third conductor (203) are connected in series at intervals.

3. The stator of the flat wire motor according to claim 2, characterized in that, In the case where "when viewed along the circumferential direction (C) of the stator core (10), the sub-conductors (200) in each conductor group are arranged in the order of their insertion into the winding slots as follows: the second conductor (202), the first conductor (201), and the third conductor (203)", Furthermore, for each of the branches, in the case where 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.

4. The stator of the flat wire motor according to claim 2, characterized in that, In the case where "when viewed along the circumferential direction (C) of the stator core (10), the sub-conductors (200) in each conductor group are arranged in the order of their insertion into the winding slots as follows: the second conductor (202), the first conductor (201), and the third conductor (203)", Furthermore, for each of the branches, in the case where 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.

5. The stator of the flat wire motor according to claim 2, characterized in that, In the case where "when viewed along the circumference (C) of the stator core (10), the sub-conductors (200) in each conductor group are arranged in the order of their insertion into the winding slots as follows: the first conductor (201), the third conductor (203), and the second conductor (202)", Furthermore, for each of the branches, in the case where 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.

6. The stator of the flat wire motor according to claim 2, characterized in that, In the case where "when viewed along the circumference (C) of the stator core (10), the sub-conductors (200) in each conductor group are arranged in the order of their insertion into the winding slots as follows: the first conductor (201), the third conductor (203), and the second conductor (202)", Furthermore, for each of the branches, in the case where 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+1, and the span between the two sub-conductors (200) at the first type node of the other branch is K-1.

7. The stator of the flat wire motor according to any one of claims 1 to 6, characterized in that, The value of K is 9.

8. The stator of the flat wire motor according to any one of claims 1 to 6, 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.

9. A flat wire motor, characterized in that, It includes a rotor and a stator for a flat wire motor according to any one of claims 1 to 8.

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