CN115986991A - Stator of flat wire motor and flat wire motor - Google Patents

Abstract

The invention provides a stator of a flat wire motor and the flat wire motor, wherein the number of slots of each phase of each pole of the stator is 3, the number of poles of the stator is even times of 3, the number of layers of a flat wire stator winding formed in a winding slot is 2M, and M is an even number which is more than or equal to 2; the winding comprises three-phase windings, each phase winding comprises 2 parallel branches, and each branch is formed by connecting a plurality of U-shaped sub-conductors in series; each phase winding comprises a plurality of conductor groups, each conductor group comprises 3 sub-conductors, and the span is respectively K +1, K and K-1; each sub-conductor spans two adjacent layers, namely a 2N layer and a 2N-1 layer; the slots occupied by the sub-conductors are within M layers located radially inward, each pole occupies three consecutive inner slots per phase, and within M layers located radially outward, each pole occupies three consecutive outer slots per phase, the three inner slots and the three outer slots of each pole being circumferentially staggered by one slot position. The stator provided by the invention has the advantages of compact structure, low manufacturing cost, small harmonic influence and good working performance.

Description

Stator of flat wire motor and flat wire motor

Technical Field

The invention relates to the field of motors, in particular to a stator of a flat wire motor using a flat wire as a winding and the flat wire motor.

Background

Taking a motor of a new energy automobile as an example, a motor stator using a flat wire as a winding has a high copper filling rate, and the power density of the motor can be improved.

However, the flexibility of the arrangement of the flat wire winding is poor relative to the circular wire winding, and how to arrange the flat wire winding according to the requirements of various performances of the motor, so that the winding has a simple structure and low manufacturing cost, and the motor has better working performance (for example, smaller harmonic interference), which is a problem to be solved in the field.

Particularly, for a flat wire winding with the number q of slots per pole per phase being 3, the number 2P of poles being even times of 3 and 2 branches being connected in parallel, the winding mode in the prior art is complex. For example, the outlet ends of the branches are widely spaced in the circumferential direction of the stator (even up to 180 °), so that the arrangement of the busbars is complicated; or the space occupied by one of the ends of the winding is large, so that the installation of the rotor has certain limitations.

Disclosure of Invention

The present invention aims to overcome or at least alleviate the above-mentioned deficiencies of the prior art and to provide a stator for a flat wire motor and a flat wire motor.

According to a first aspect of the present invention, there is provided a stator of a flat wire motor, comprising a stator core and a flat wire stator winding, wherein,

the number of winding slots of each phase of each pole of the stator is 3, the number of poles of the stator is even times of 3, the number of layers of the flat wire stator winding formed in the winding slots is 2M, M is an even number which is more than or equal to 2,

the flat wire stator winding comprises three-phase windings, the flat wire stator winding of each phase comprises 2 branches connected in parallel, each branch is formed by connecting a plurality of U-shaped sub-conductors in series,

the flat wire stator winding of each phase comprises a plurality of conductor sets, each of the conductor sets comprises 3 sub-conductors which are respectively a first conductor, a second conductor and a third conductor,

the first conductor has a span of K +1, the second conductor has a span of K, the third conductor has a span of K-1, K is a positive integer,

viewed along the circumferential direction of the stator core, the sub-conductors in each conductor group are sequentially arranged according to the sequence of the winding slots in which the sub-conductors are inserted: the second conductor, the first conductor, and the third conductor, or: the first conductor, the third conductor, and the second conductor,

each of the sub-conductors spans two adjacent layers, the two adjacent layers are respectively a 2N layer and a 2N-1 layer, N is a positive integer,

the slots occupied by the sub-conductors occupy, in M layers located radially inward, three consecutive inner winding slots per pole per phase, and, in M layers located radially outward, 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.

In at least one embodiment, for the flat wire stator windings of each phase, the span between adjacent ones of the sub-conductors in the series path within each of the legs is K except at a first type node and a second type node,

the first-type node is positioned between two sub-conductors which are positioned at the radially innermost layer or the radially outermost layer, are adjacent to each other on the series path and run in series in the circumferential direction, the span between the two sub-conductors at the first-type node is K +1 or K-1, or the span between the two sub-conductors at the first-type node is K +2 or K-2,

the second-class node is located between two sub-conductors which are adjacent on the series path and located on the Mth layer and the Mth +1 layer respectively, and the span between the two sub-conductors at the second-class node is both K +1 or both K-1.

In at least one embodiment, for the flat wire stator windings of each phase, all of the second conductors are connected together in series in succession within each of the legs, and the first conductors and the third conductors are connected together in series at intervals from each other.

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

and for each of said branches, one of said second conductors being in direct series with said first conductor,

in the flat wire stator winding of each phase, 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.

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

and for each of said branches, one of said second conductors is in direct series with said third conductor,

in the flat wire stator winding of each phase, 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.

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

and for each of said branches, one of said second conductors being in direct series with said first conductor,

in the flat wire stator winding of each phase, 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.

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

and for each of said branches, one of said second conductors is in direct series with said third conductor,

in the flat wire stator winding of each phase, 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.

In at least one embodiment, K has a value of 9.

In at least one embodiment, the outlet end and the lead end of each branch are located at the radially outermost layer, or

And the wire outlet end and the wire leading end of each branch are positioned on the radially innermost layer.

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

The stator has the advantages of compact structure, low manufacturing cost, small harmonic influence during working and good working performance. The flat wire motor according to the invention has in particular the same advantages.

Drawings

Fig. 1 is a schematic view of a stator according to an embodiment of the present invention.

Fig. 2 is a schematic diagram of one possible two-limb three-phase winding using a star connection.

Fig. 3 is a schematic diagram of a possible delta connection for a two-branch three-phase winding.

Figure 4 is a schematic view of a flat wire stator winding according to one embodiment of the present invention.

Fig. 5 is a schematic diagram of one of the phases of a winding according to an embodiment of the present invention.

Fig. 6 is a schematic front view of a sub-conductor according to an embodiment of the present invention.

Fig. 7 is a schematic top view of the sub-conductor of fig. 6.

Fig. 8 and 9 are schematic front and top views of the back twisting at the weld end of one leg of sub-conductors of different spans according to one embodiment of the invention.

Fig. 10 is a layered schematic view of one winding slot of a stator core according to a first embodiment of the present invention.

Fig. 11 is a schematic diagram of a routing manner of a phase winding according to the first embodiment of the present invention.

Fig. 12 is a schematic diagram of a routing manner of a phase winding according to a second embodiment of the present invention.

Fig. 13 is a schematic diagram of a routing manner of a phase winding according to a third embodiment of the present invention.

Fig. 14 is a schematic diagram of a routing manner of a phase winding according to a fourth embodiment of the present invention.

Fig. 15 is a schematic diagram of a routing manner of a phase winding according to a fifth embodiment of the present invention.

Fig. 16 is a schematic diagram of a winding connected at a kink node using an auxiliary conductor according to another embodiment of the invention.

Description of reference numerals:

10. a stator core; 20 flat wire stator windings; 21. a crown end; 21a folding; 22. welding the end; 200. a sub-conductor; 201. a first conductor; 202. a second conductor; 203. a third conductor; 200f auxiliary conductors; 30. and (4) leading out copper bars.

Detailed Description

Exemplary embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood that the detailed description is intended only to teach one skilled in the art how to practice the invention, and is not intended to be exhaustive or to limit the scope of the invention.

Referring to fig. 1 to 16, a stator of a flat wire motor according to the present application will be described. Referring to fig. 1, a indicates an axial direction of a stator, R indicates a radial direction of the stator, and C indicates a circumferential direction of the stator, unless otherwise specified.

The stator according to the present application includes a stator core 10, a flat wire stator winding 20 (hereinafter also referred to simply as a winding 20), and an outlet copper bar 30.

The stator core 10 has winding slots (hereinafter, simply referred to as slots) formed in the inner periphery thereof and extending in the axial direction a, the number q of slots per pole per phase being 3, and the number 2P of poles of the stator being an even number multiple of 3. In the present embodiment, the number of poles 2p =6, and the total number of winding grooves is 54. It should be understood that in other possible embodiments, the number of winding slots may vary with the number of poles 2P.

As shown in fig. 2 and 3, each phase winding includes 2 parallel branches. The three-phase windings may be connected in a star shape as shown in fig. 2, or in a triangle shape as shown in fig. 3, for example.

The windings in the winding slots are formed in an even number of layers 2m, m being 2 or more in the radial direction R, i.e. the number of layers may be 4,8,12, etc.

The winding 20 of each phase comprises a plurality of conductor sets, each conductor set comprising 3 sub-conductors 200.

Referring to fig. 5, the sub-conductor 200 is divided into a first conductor 201, a second conductor 202, and a third conductor 203 according to a difference in distance between two legs (hereinafter, referred to as a span) of each sub-conductor 200. The difference of the slot numbers of the two winding slots in the circumferential direction C into which the two legs of the sub-conductor 200 are inserted is taken as the measurement of the span, 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 K is a positive integer.

Referring to fig. 6, each sub-conductor 200 has a substantially U-shape, and is connected at one end in the axial direction a to form a crown end 21 and branched at the other end to form a weld end 22. Two leg portions of each sub-conductor 200 extending in the axial direction a are used for insertion into the winding slots.

Fig. 7 shows a schematic view of a top view of the sub-conductor 200. Since each sub-conductor 200 is cross-layered, that is, the two leg portions 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 the present embodiment, and the fold makes it possible to shift the two leg portions of the sub-conductor 200 in the radial direction R. The cross-layer of sub-conductors 200 also allows sub-conductors 200, particularly sub-conductor 200 located at the radially innermost layer, to occupy no excessive radial space, thereby allowing winding 20 to have a larger inner diameter at the ends to facilitate rotor installation.

For each sub-conductor 200, it spans two adjacent layers, i.e., two legs of the sub-conductor 200 are inserted into adjacent layers of different slots, and the two adjacent layers are respectively the 2N-th layer and the 2N-1-th layer, N is a positive integer.

(first embodiment)

Next, referring to fig. 10 and 11, a stator according to a first embodiment of the present application will be described taking as an example a stator in which a 4-layer structure is formed in a slot. For convenience of description, the arrangement of each sub-conductor 200 will be described in detail by taking one of the phases, for example, the U-phase, as an example.

Referring to fig. 10, in the following description, different layers in the winding slots are denoted by lower case english letters a, b, c, d, which respectively denote the 1 st, 2 nd, 3 rd, and 4 th layers counted from the radially outer side to the radially inner side. It should be understood that the layer in the winding slot is a virtual concept, such a layer is formed due to the lamination of the leg portions of the plurality of sub-conductors 200, and when the sub-conductors 200 are not disposed in the slot, the layered structure is not present in the slot.

In the present embodiment, the winding 20 of each phase includes 12 conductor sets. Within each conductor set, the first, second and third conductors 201, 202 and 203 have a span of 10, 9 and 8, respectively, i.e. K =9 as previously described.

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: a second conductor 202, a first conductor 201, and a third conductor 203.

This arrangement order fits the span of the three sub-conductors 200 such that the leg portions on both sides of the three sub-conductors 200 of each conductor set are located in three consecutive slots, respectively. For example, in fig. 11, three sub-conductors 200 of one conductor set starting from the 4 th slot in the c-layer and the d-layer have three legs on one side occupying the d-layers of the slots 4, 5, and 6, respectively, and legs on the other side occupying the c-layers of the slots 13, 14, and 15, respectively.

The conductor sets of the two layers (i.e., the layer C and the layer d) positioned on the radial inner side and the conductor sets of the two layers (i.e., the layer a and the layer b) positioned on the radial outer side are staggered by a slot position in the circumferential direction C. Or, in the M layers located radially inward, each pole occupies three consecutive inner winding slots per phase; in the M layers located on the radial outer side, each pole and each phase occupy three continuous outer winding grooves; the three inner winding grooves and the three outer winding grooves of each phase of each pole are staggered by one groove position in the circumferential direction.

For example, in fig. 11, the three inner winding grooves of the first pole are the grooves 4, 5, and 6 in the layers c and d, and the three outer winding grooves of the first pole are the grooves 3, 4, and 5 in the layers a and b, which are all circumferentially shifted by one groove.

The interlaminar dislocation, or the staggered arrangement of the slot positions occupied by different layers in the circumferential direction C can reduce the winding harmonic wave, thereby reducing the NVH during the operation of the motor.

The position of each conductor set in each layer of the slot can be determined according to the above rules. Specifically, the routing of each branch, i.e., the serial connection sequence of the sub-conductors 200 of each branch, is achieved by selecting appropriate adjacent legs of adjacent sub-conductors 200 for electrical connection (e.g., two legs are soldered at the soldering terminal 22 in this embodiment).

For convenience of description, the arrangement of the two legs of each sub-conductor 200 in different slots and different layers is denoted by the symbols like:

first conductor 201: {. A- > b };

second conductor 202: [. A-. B ];

third conductor 203: (. A-. B);

wherein, indicates the number of the groove, and a/b indicates the number of the layer in the groove.

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

The connection of the weld end 22 follows the law:

within each branch, the span between adjacent sub-conductors 200 in the series path is K =9 except for a first type node (hereinafter also referred to as a kink node) and a second type node (hereinafter also referred to as a dislocation node).

The torsion bar is located between two sub-conductors 200 that are adjacent to each other in the series path and opposite in the circumferential direction C, and are located on the radially innermost layer or the radially outermost layer. The span between two sub-conductors 200 at the kink node is K +1=10 or K-1=8; or more specifically, the span between two sub-conductors 200 at the kink node of one leg is 10 and the span between two sub-conductors 200 at the kink node of the other leg is 8.

In this embodiment, the outlet end of each branch is located on the layer a. For example, when the direction of the first branch is viewed from the 21 st groove a layer as a starting point, the sub-conductor 200 of the first branch first crosses in a direction in which the number of grooves becomes smaller (this direction is defined as a counterclockwise direction) and in a direction in which the number of layers becomes larger, for example, the second conductor 202 (21a-12 b } crosses from the 21 st groove to the 12 th groove and from the a-th layer to the b-th layer; in this order, the serially connected sub-conductors 200 of the first branch firstly circulate around the a-layer and the b-layer (in the direction in which the number of layers spanning from the a-layer to the b-layer becomes larger) in the counterclockwise direction, then extend to the c-layer and the d-layer (in the direction in which the number of layers spanning from the c-layer to the d-layer becomes larger) to continue to circulate around in the counterclockwise direction, then meet the anti-torsion node, start to circulate around the c-layer and the d-layer (in the direction in which the number of layers spanning from the d-layer to the c-layer becomes smaller) in the clockwise direction, then extend to the a-layer and the b-layer (in the direction in which the number of layers spanning from the b-layer to the a-layer becomes smaller) to circulate around in the clockwise direction until the first branch lead terminal. The anti-twist node is located on the radially innermost layer opposite the outlet end (radially outermost layer).

The adjacent legs of two adjacent sub-conductors 200 at the kink node are located at the same layer, d in this embodiment.

The offset node is located between two sub-conductors 200 adjacent to each other in the series path and located in the M =2 th layer and the M +1=3 rd layer, respectively, and the span between the two sub-conductors 200 at the offset node is K-1=8.

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

That is, the 6 second conductors 202 of the first branch are serially connected in sequence, the remaining first conductor 201 and third conductor 203 are serially connected with a space therebetween, and one of the second conductors 202 is serially connected to the third conductor 203.

Specifically, the direction of each sub-conductor 200 of the first branch is:

leading-out terminal- [21a-12b ] - [3a-48b ] - [39a-30b ] =

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

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

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

It should be understood that while the foregoing is intended to facilitate the reader's view of the placement of the sub-conductors 200 between different adjacent layers, and to facilitate the view of different arrangements of the sub-conductors in front of and behind the anti-twist node, it is contemplated that sub-conductors 200 in different rows may still be connected in series.

Where "-" indicates the above-mentioned series arrangement, the anti-torsion node is indicated. It can be seen that one leg of the 6 th second conductor 202, i.e., [40c-31d ], is in 31 slots, one leg of the 1 st first conductor 201, i.e., {41d-51c } is in 41 slots, and the span between the bonding ends of these two legs is 10, i.e., where the anti-twist span is 10.

Method of changing the span of adjacent legs at the weld end 22 referring to fig. 8 and 9, the span of the weld end 22 can be changed by folding the weld end 22 of one of the legs to, for example, the outer peripheral side.

The place indicated by "=" in the above-described series arrangement mode indicates a dislocation node. It can be seen that the dislocation nodes occur between layer c and layer b, specifically, the dislocation nodes are between number numbers 6 and 7, and between number numbers 24 and 25, with a dislocation span of 8.

The run of this first branch corresponds to the underlined and bolded numerical sequence number in fig. 11. The sequence of numerical ordinals represents the series sequence; the column number and row number in which each numerical serial number is located respectively indicate the slot number and layer number into which the respective leg portion of the respective sub-conductor 200 is inserted. For example, the numerical numbers 1, 2, 3, 4 are respectively located at the 21-slot a layer, 12-slot b layer, 3-slot a layer, and 48-slot b layer, indicating that the consecutive four legs in the series order are respectively located at the 21-slot a layer, 12-slot b layer, 3-slot a layer, and 48-slot b layer. Corresponding to the above sequence, these four legs belong to the first leg of the 1 st second conductor 202, the second leg of the 1 st second conductor 202, the first leg of the 2 nd second conductor 202 and the second leg of the 2 nd second conductor 202, respectively. Wherein the second leg of the 1 st second conductor 202 and the first leg of the 2 nd second conductor 202 are connected together by welding at the welding end 22.

The phase second branch is described next. The outlet end of the second branch is located in the adjacent slot to the outlet end of the first branch, slot 22.

The second branch is arranged in the order of the types of the sub-conductors 200, which is exactly opposite to the first branch, as viewed in series from the outlet terminal to the lead terminal when the type of the sub-conductor 200 is selected.

A second branch circuit:

leading-out terminal- (22 a-14 b) - {5a-49b } - (40 a-32 b) - {23a-13b } - (4 a-50 b) - {41a-31b } = leading-out terminal

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

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

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

The run of the second branch corresponds to the number of the numbers in fig. 11 without underlining and with a slant. It can be seen that the anti-twist node of the second branch is located between the numbers 24 and 25 in the figure, with an anti-twist span of 8.

The dislocation nodes are located between digit numbers 12 and 13 and digit numbers 30 and 31, and the dislocation span is 8.

As can be seen from fig. 11, according to this routing manner, the outlet ends of the two branches are located in adjacent slots, the lead ends of the same two branches are located in adjacent slots, and the outlet ends and the lead ends of the two branches are located at two adjacent poles. Therefore, the end parts of all the branch circuits are located in a small range in the circumferential direction C, so that the structure of the outgoing copper bar is very compact and the material is saved.

(second embodiment)

A second embodiment of the present application is described with reference to fig. 12. The second embodiment is a modification of the first embodiment, and the same reference numerals are given to components having the same or similar structure or function as those in the first embodiment, and detailed descriptions thereof are omitted.

The main difference between this embodiment and the first embodiment is that the groove offset directions of the b-layer and the c-layer are different when they are misaligned.

In the first embodiment, the three inner winding grooves (the winding grooves on the c-level and the d-level) per phase of each pole are circumferentially behind the three outer winding grooves (the winding grooves on the a-level and the b-level) by one slot position; in the present embodiment, the three inner winding grooves (the winding grooves on the c-level and the d-level) of each phase of each pole are circumferentially one slot ahead of the three outer winding grooves (the winding grooves on the a-level and the b-level).

This misalignment pattern causes the span at the misaligned node to become K +1=10.

Since other routing rules are similar to those of the first embodiment, only the routing order of the two branches will be briefly described next.

A first branch:

leading-out terminal- [22a-13b ] - [4a-49b ] - [40a-31b ] =

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

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

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

A second branch circuit:

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

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

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

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

(third embodiment)

A third embodiment of the present application is described with reference to fig. 13. The third embodiment is a modification of the first embodiment, and the same reference numerals are given to the same or similar components in structure or function to those in the first embodiment, and detailed descriptions thereof are omitted.

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

In this embodiment, the span at the kink node of one branch is K +2=11 and the span at the kink node of the other branch is K-2=7, in accordance with the connection order.

Specifically, the routing order of the two branches:

a first branch:

leading-out terminal- [21a-12b ] - [3a-48b ] - [39a-30b ] =

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

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

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

A second branch circuit:

leading-out terminal- {23a-13b } - (4 a-50 b) - {41a-31b } - (22 a-14 b) - {5a-49b } - (40 a-32 b) =

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

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

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

(fourth embodiment)

A fourth embodiment of the present application is described with reference to fig. 14. The fourth embodiment is a modification of the first embodiment, and the same reference numerals are given to components having the same or similar structure or function as those in the first embodiment, and detailed description thereof is omitted.

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 in each conductor group are arranged in the order of the winding slots into which they are inserted: a first conductor 201, a third conductor 203 and a second conductor 202.

In this embodiment, the span at the kink node of one branch is K +2=11 and the span at the kink node of the other branch is K-2=7, in accordance with the connection order.

Specifically, the routing order of the two branches:

a first branch:

leading-out terminal- (21 a-13 b) - {4a-48b } - (39 a-31 b) - {22a-12b } - (3 a-49 b) - {40a-30b } = leading-out terminal

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

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

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

A second branch circuit:

leading-out terminal- [23a-14b ] - [5a-50b ] - [41a-32b ] =

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

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

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

(fifth embodiment)

A fifth embodiment of the present application will be described with reference to fig. 15. The fifth embodiment is a modification of the first, third, and fourth embodiments, and the same reference numerals are given to the same or similar components in structure or function to those in the first embodiment, and detailed description thereof is omitted.

The main differences between this embodiment and the first embodiment are:

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 winding slots into which they are inserted: a first conductor 201, a third conductor 203, and a second conductor 202;

second, for each leg of each phase, one of the second conductors 202, when connected in series with the other conductors, is optionally directly connected to the third conductor 203.

The simultaneous change of the above two rules results in such a connection order being adapted, and in this embodiment, the span at the deskew node of one branch is K +1=10, and the span at the deskew node of the other branch is K-1=8 (the same as in the first embodiment).

Specifically, the routing order of the two branches:

a first branch:

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

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

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

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

A second branch circuit:

leading-out terminals- [23a-14b ] - [5a-50b ] - [41a-32b ] = or

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

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

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

It will be appreciated that the above described embodiments and some of their aspects or features may be combined as appropriate. For example:

the second embodiment may be modified with reference to the third to fifth embodiments, specifically including the following three modifications.

A first variant: in each branch of each phase one of the second conductors 202 is optionally directly connected to the third conductor 203 when connected in series with the other conductors. In this variant, the span at the kink node of one branch is K +2=11 and the span at the kink node of the other branch is K-2=7, in accordance with the connection sequence. The span at the staggered nodes is K +1=10.

A second variation: 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: a first conductor 201, a third conductor 203 and a second conductor 202. In this variant, the span at the kink node of one branch is K +2=11 and the span at the kink node of the other branch is K-2=7, in accordance with this connection sequence. The span at the staggered nodes is K +1=10.

The third variation: 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 winding slots into which they are inserted: a first conductor 201, a third conductor 203, and a second conductor 202; secondly, in 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. In this variant, the span at the kink node of one branch is K +1=10 and the span at the kink node of the other branch is K-1=8, in accordance with this connection sequence. The span at the staggered nodes is K +1=10.

The invention has at least one of the following advantages:

(i) Each sub-conductor 200 spans two layers so that the sub-conductor 200, especially the sub-conductor 200 located at the radially innermost side, does not occupy too much space in the radial direction, so that the winding 20 has a larger inner diameter at the end, facilitating the mounting of the rotor.

(ii) The interval between the wire outlet end and the wire leading end of the windings of the two branches of each phase is small in the circumferential direction C, so that the structure is compact and simple, the branch windings are symmetrical in space, and loop current cannot be generated.

(iii) The line mode of walking that radially inboard M layer and the radial outside M layer of trench of every utmost point every looks conductor staggers in circumference can reduce the harmonic influence, reduces the noise.

Of course, the present invention 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 invention without departing from the scope of the present invention under the teaching of the present invention. For example:

(i) The outlet terminals and the lead terminals in the above embodiments can be interchanged;

(ii) The above embodiments all place the outlet and lead ends at the radially outermost layer and the anti-twist node at the radially innermost layer, but this is not essential, and for example, the outlet and lead ends may be at the radially innermost layer and the anti-twist node at the radially outermost layer;

(iii) The slot numbers selected for each phase of each pole in the above-described embodiment may be translated as a whole in the circumferential direction C.

(iv) For the connection of the weld end 22 at the reverse twist span, in addition to the sub-conductor 200 being folded back at the weld end 22 to change the span with the leg portion of the adjacent sub-conductor 200 as in fig. 8 and 9, other auxiliary conductors 200f (also referred to as busbars) may be used to electrically connect the leg portions of the adjacent sub-conductors 200, for example, referring to fig. 16.

Claims (10)

1. The stator of the flat wire motor comprises a stator core (10) and a flat wire stator winding (20), and is characterized in that,

the number of winding slots of each phase of each pole of the stator is 3, the number of poles (2P) of the stator is even times of 3, the number of layers of the flat wire stator winding (20) formed in the winding slots is 2M, M is an even number which is more than or equal to 2,

the flat wire stator winding (20) comprises a three-phase winding, the flat wire stator winding (20) of each phase comprises 2 branches connected in parallel, each branch is formed by connecting a plurality of U-shaped sub-conductors (200) in series,

the flat wire stator winding (20) of each phase comprises a plurality of conductor sets, each of which comprises 3 of the sub-conductors (200), respectively a first conductor (201), a second conductor (202) and a third conductor (203),

the first conductor (201) has a span of K +1, the second conductor (202) has a span of K, the third conductor (203) has a span of K-1, K being a positive integer,

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: 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, which are respectively a 2N-th layer and a 2N-1-th layer, N being a positive integer,

the slots occupied by the sub-conductors (200) occupy, in M layers located radially inward, three consecutive inner winding slots per pole per phase, and, in M layers located radially outward, 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.

2. The stator of a flat wire electric machine according to claim 1, characterized in that for the flat wire stator winding (20) of each phase, the span between the sub-conductors (200) adjacent in the series path is K in each branch except for the first type node and the second type node,

the node of the first type is located between two radially innermost or outermost sub-conductors (200) which are adjacent in series path and run in series in the circumferential direction (C) in opposite directions, the span between two sub-conductors (200) at the node of the first type is K +1 or K-1, or the span between two sub-conductors (200) at the node of the first type is K +2 or K-2,

the second-class node is located between two sub-conductors (200) which are adjacent to each other on the series path and located on the Mth layer and the Mth +1 layer respectively, and the span between the two sub-conductors (200) at the second-class node is both K +1 or both K-1.

3. The stator of a flat wire electric machine according to claim 2, characterized in that, for the flat wire stator winding (20) of each phase, within each of the branches, all of the second conductors (202) are connected in series in succession, the first conductors (201) and the third conductors (203) being connected in series at a distance from each other.

4. The stator of a flat wire electric machine according to claim 3, wherein the sub-conductors (200) in each of the conductor groups are arranged in the order of the winding slots into which they are inserted, as viewed "in the circumferential direction (C) of the stator core (10), in the order of: in the case of the second conductor (202), the first conductor (201), and the third conductor (203) ",

and for each of said branches, one of said second conductors (202) being in direct series with said first conductor (201),

in the flat wire stator winding (20) of each phase, the span between two sub-conductors (200) at the first-type node of one branch is K +1, and the span between two sub-conductors (200) at the first-type node of the other branch is K-1.

5. The stator of a flat wire electric machine according to claim 3, wherein the sub-conductors (200) in each of the conductor groups are arranged in the order of the winding slots into which they are inserted, as viewed "in the circumferential direction (C) of the stator core (10), in the order of: in the case of the second conductor (202), the first conductor (201), and the third conductor (203) ",

and for each of said branches, one of said second conductors (202) being in direct series with said third conductor (203),

in the flat wire stator winding (20) of each phase, the span between two of the sub-conductors (200) at the first type node of one of the legs is K +2, the span between two of the sub-conductors (200) at the first type node of the other branch is K-2.

6. The stator of a flat wire motor according to claim 3, wherein the sub-conductors (200) in each of the conductor groups are arranged in the order of the winding slots into which they are inserted, as viewed "in the circumferential direction (C) of the stator core (10), in the order: in the case of the first conductor (201), the third conductor (203) and the second conductor (202) ",

and for each of said branches, one of said second conductors (202) being in direct series with said first conductor (201),

in the flat wire stator winding (20) of each phase, the span between two sub-conductors (200) at the first-type node of one branch is K +2, and the span between two sub-conductors (200) at the first-type node of the other branch is K-2.

7. The stator of a flat wire electric machine according to claim 3, wherein the sub-conductors (200) in each of the conductor groups are arranged in the order of the winding slots into which they are inserted, as viewed "in the circumferential direction (C) of the stator core (10), in the order of: in the case of the first conductor (201), the third conductor (203) and the second conductor (202) ",

and for each of said branches, one of said second conductors (202) being in direct series with said third conductor (203),

in the flat wire stator winding (20) of each phase, the span between two sub-conductors (200) at the first-type node of one branch is K +1, and the span between two sub-conductors (200) at the first-type node of the other branch is K-1.

8. The stator of a flat wire electric machine according to any of claims 1 to 7, characterized in that the value of K is 9.

9. The flat-wire motor stator according to any one of claims 1 to 7, wherein the outlet end and the lead end of each branch are located on the radially outermost layer, or

And the wire outlet end and the wire leading end of each branch are positioned on the radially innermost layer.

10. A flat wire electric machine comprising a stator of the flat wire electric machine according to any one of claims 1 to 9 and a rotor.

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