CN220107690U - Flat wire stator and flat wire motor - Google Patents

Abstract

The utility model relates to the field of motors, in particular to a flat wire stator and a flat wire motor. The flat wire stator comprises a stator core and a flat wire winding, wherein a plurality of wire slots are formed in the inner side of the stator core, and each wire slot is formed with a plurality of wire layers. The flat wire winding comprises multiple phases, each phase comprises multiple branches which are arranged in parallel, each branch surrounds the stator core through multiple wire layers of part of wire slots, multiple circles of the branches are wound on the stator core, each branch is wound from the innermost layer of the stator core and gradually transits to the outermost layer of the stator core, and then the branches are wound back to the innermost layer from the outermost layer. Through the wiring mode of the utility model, each branch of the multi-phase flat wire winding is uniformly distributed on the stator core along the radial direction of the stator core, so that each phase flat wire winding and each branch of each phase flat wire winding are balanced, and the circulation is avoided to a certain extent.

Description

Flat wire stator and flat wire motor

Technical Field

The utility model relates to the field of motors, in particular to a flat wire stator and a flat wire motor.

Background

The driving motor used for the new energy automobile generally comprises a flat wire motor and a round wire motor, wherein the flat wire motor has higher slot fullness rate and power density compared with the round wire motor, so that the flat wire motor is widely applied to the field of driving motors for automobiles. The flat wire stator is used as a core component of the flat wire motor and comprises a stator core with a plurality of wire slots formed in the inner periphery side and a multi-phase flat wire winding wound on the core through the wire slots, wherein the winding mode of the flat wire winding on the core is various, but the current winding mode can not ensure that the flat wire winding is uniformly distributed on the core, and circulation is easy to occur.

Disclosure of Invention

The utility model aims to provide a flat wire stator and a flat wire motor, which are used for ensuring that multiphase flat wire windings are uniformly distributed on an iron core to a certain extent and avoiding the occurrence of a circulation phenomenon.

The utility model provides a flat wire stator, which comprises a stator core and a flat wire winding;

a plurality of wire grooves are uniformly formed in the inner side of the stator core at intervals along the circumferential direction of the stator core, and a plurality of wire layers are formed in each wire groove along the radial direction of the stator core;

the flat wire windings comprise multiple phases, each flat wire winding comprises multiple branches which are arranged in parallel, each branch surrounds the stator core for multiple circles through multiple wire layers of part of the wire grooves, each branch is gradually wound to the outermost layer from the innermost layer of the stator core, and the branches are reversely wound back to the innermost layer of the stator core from the outermost layer of the stator core after reverse twisting.

Further, the number of the wire grooves is 54, and each wire groove is provided with 6 wire layers;

the flat wire winding is three-phase, and is respectively a V-phase winding, a U-phase winding and a W-phase winding, and each phase of the flat wire winding comprises three branches which are arranged in parallel.

Further, each branch comprises a plurality of U-shaped flat wire hairpin pieces which are connected in sequence;

the flat wire hairpin comprises two flat wire conductors which are arranged at intervals in parallel, the first ends of the two flat wire conductors are connected through a bridging flat wire, and the two flat wire conductors can be respectively inserted into adjacent wire layers of the two wire slots.

Further, the winding length of each branch of the three-phase flat wire winding is equal.

Further, in the plurality of flat wire hairpins of the same branch, part of the hairpins are a first hairpin, and the other part of the hairpins are a second hairpin;

the span of the second hairpin is N trunking, the span of the first hairpin is N+3 trunking, wherein N is a positive integer.

Further, in the plurality of flat wire hairpin cards positioned in the same branch, two second hairpin cards are arranged between two adjacent first hairpin cards.

Further, each phase of the flat wire winding comprises a plurality of card sending units, each card sending unit comprises three flat wire card sending units, and the three flat wire card sending units of each card sending unit are respectively positioned in three branches;

the three flat wire hairpins of the same hairpins unit comprise a first hairpin and two second hairpins, the two second hairpins are arranged in a staggered mode according to the position of one wire slot, and the first hairpins are arranged on the outer sides of the two second hairpins in a straddling mode.

Further, the span of the first hairpin is 10 trunking, and the span of the second hairpin is 7 trunking.

Further, the second ends of the first flat wire and the second flat wire of the flat wire hairpin are respectively provided with a connecting pin with an external skimming;

or the second ends of the first flat wire and the second flat wire of the flat wire hairpin are respectively provided with connecting pins which are skimmed to the same side.

The utility model also provides a flat wire motor, which comprises the flat wire stator.

Compared with the prior art, the utility model has the beneficial effects that:

the flat wire stator comprises a stator core and a flat wire winding, wherein a plurality of wire grooves are formed in the inner side of the stator core, the wire grooves are uniformly distributed at intervals along the circumferential direction of the stator core, and the opening directions of the wire grooves face the inner side of the stator core; the plurality of wire slots penetrate through two ends of the stator core along the axial direction of the stator core, and each wire slot has a preset slot depth along the radial direction of the stator core, so that flat wire conductors of the multi-layer flat wire winding can be distributed in each wire slot along the radial direction of the stator core, namely, a plurality of wire layers are formed in each wire slot along the radial direction of the stator core. The flat wire winding is wound on the stator core through a plurality of wire slots on the stator core, the flat wire winding comprises a plurality of phases, each phase of flat wire winding comprises a plurality of branches which are arranged in parallel, each branch of the multi-phase flat wire winding surrounds the stator core through a plurality of wire layers of part of the wire slots respectively, a plurality of circles of the branches are wound on the stator core, each branch is wound from the innermost layer of the stator core and gradually transits to the outermost layer of the stator core, and then the branches are wound back to the innermost layer from the outermost layer; for example, each branch is wound around the stator core in a counterclockwise direction and has an innermost layer to an outermost layer, and after reaching the outermost layer, the branch is twisted back, and then wound around the stator core in a clockwise direction from the outermost layer and returns to the innermost layer of the stator core.

Through the wiring mode of the utility model, each branch of the multi-phase flat wire winding is uniformly distributed on the stator core along the radial direction of the stator core, so that each phase flat wire winding and each branch of each phase flat wire winding are balanced, and the circulation is avoided to a certain extent.

The utility model also provides a flat wire motor which comprises the flat wire stator, so that the flat wire motor also has the beneficial effects of the flat wire stator.

Drawings

In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present utility model, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic structural view of a stator core of a flat wire stator according to an embodiment of the present utility model;

FIG. 2 is an enlarged view of FIG. 1 at A;

fig. 3 is a schematic winding diagram of three branches of V-phase of a flat wire stator according to an embodiment of the present utility model;

fig. 4 is a schematic structural diagram of a card issuing unit formed by three flat wire card issuing units with a bending mode according to an embodiment of the present utility model;

fig. 5 is a schematic structural diagram of a card issuing unit formed by three flat wire cards with another bending mode according to an embodiment of the present utility model.

Reference numerals:

1-stator core, 2-wire casing, 3-first hairpin, 4-second hairpin, 5-connecting pin.

Detailed Description

The following description of the embodiments of the present utility model will be made apparent and fully in view of the accompanying drawings, in which some, but not all embodiments of the utility model are shown.

The components of the embodiments of the present utility model generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the utility model, as presented in the figures, is not intended to limit the scope of the utility model, as claimed, but is merely representative of selected embodiments of the utility model.

All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

In the description of the present utility model, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present utility model, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.

A flat wire stator and a flat wire motor according to some embodiments of the present utility model are described below with reference to fig. 1 to 5.

The utility model provides a flat wire stator, as shown in fig. 1 to 3, which comprises a stator core 1 and a flat wire winding, wherein a plurality of wire slots 2 are formed in the inner side of the stator core 1, the wire slots 2 are uniformly distributed at intervals along the circumferential direction of the stator core 1, and the opening directions of the wire slots 2 face the inner side of the stator core 1; the plurality of wire slots 2 penetrate through two ends of the stator core 1 along the axial direction of the stator core 1, and each wire slot 2 has a predetermined slot depth along the radial direction of the stator core 1, so that flat wire conductors of a plurality of layers of flat wire windings can be distributed in each wire slot 2 along the radial direction of the stator core 1, namely, a plurality of wire layers are formed in each wire slot 2 along the radial direction of the stator core 1.

The flat wire winding is wound on the stator core 1 through a plurality of wire slots 2 on the stator core 1, the flat wire winding comprises a plurality of phases, each phase of flat wire winding comprises a plurality of branches arranged in parallel, each branch of the multi-phase flat wire winding surrounds the stator core 1 through a plurality of wire layers of part of the wire slots 2 and winds on the stator core 1 for a plurality of circles, each branch is wound from the innermost layer of the stator core 1 and gradually transits to the outermost layer of the stator core 1, and then is wound back to the innermost layer from the outermost layer; for example, each branch is wound around the stator core 1 in the counterclockwise direction and has an innermost layer to transition to an outermost layer, and is twisted back after reaching the outermost layer, and then wound around the stator core 1 in the clockwise direction from the outermost layer and returns to the innermost layer of the stator core 1.

By adopting the wiring mode, each branch of the multi-phase flat wire winding is uniformly distributed on the stator core 1 along the radial direction of the stator core 1, so that each phase flat wire winding and each branch of each phase flat wire winding are balanced, and circulation is avoided to a certain extent.

In one embodiment of the present utility model, the number of slots 2 on the stator core 1 is preferably 54, the slots 2 on the iron core are sequentially ordered into slots 2 No. 1 and slots 2 No. 2 in the clockwise direction, wherein the slots 2 are the slots 2 of the number 54; each slot 2 has 6 wire layers, and is a first wire layer, a second wire layer, and a sixth wire layer in this order from the inside to the outside of the stator core 1. The flat wire windings are three-phase, namely a V-phase winding, a U-phase winding and a W-phase winding, and each phase of flat wire winding comprises three branches which are arranged in parallel.

In this embodiment, preferably, for a plurality of branches of the three-phase flat wire winding, each branch is composed of a plurality of flat wire hairpin connected in sequence. Specifically, referring to fig. 4, the flat wire hairpin is in a U shape, and includes two flat wire conductors and a bridging flat wire, the two flat wire conductors are arranged in parallel at intervals, and first ends of the two flat wire conductors are connected through the bridging flat wire, so as to form the U-shaped flat wire hairpin; the two flat wire conductors of the flat wire hairpin can be inserted into the two wire slots 2 respectively, and the flat wire hairpin has a predetermined span such that a plurality of (say, 7 or 10 mentioned below) wire slots 2 are spaced between the two wire slots 2 into which it is inserted, while the two flat wire conductors are located in adjacent different wire slots 2, such as two flat wire conductors of one flat wire hairpin, one of the flat wire conductors is located in a first wire slot 2 of No. 1 and marks the position as (1, 1), the other flat wire conductor is located in a second wire slot 2 of No. 47 and marks the position as (47, 2), and at this time 7 wire slots 2 are spaced between No. 1 and No. 47 wire slots 2, i.e., the span of the flat wire conductor is 7.

In this embodiment, preferably, referring to fig. 3 and 4, the flat wire hairpin having two spans in each branch is a first hairpin 3 and a second hairpin 4, where the span of the second hairpin 4 is smaller, N trunking 2 are spaced between two trunking 2 in which two flat wire conductors of the second hairpin 4 are inserted, and the span of the first hairpin 3 is larger, n+3 trunking 2 are spaced between two trunking 2 in which two flat wire conductors of the first hairpin 3 are inserted, N is a positive integer.

Specifically, N is 7, that is, the span of the first hairpin 3 is 10 trunking 2, and the span of the second hairpin 4 is 7 trunking 2.

Referring to fig. 3, a branch of the V-phase winding is taken as an example, the starting point of the winding of the branch is a first wire layer of a wire slot 2 of No. 1, the span of a first flat wire hairpin of the branch is 7, and two flat wire conductors connected by a bridging flat wire are respectively inserted into (47, 2) and (1, 1); the span of the second flat wire hairpin is 7, and two flat wire conductors are respectively inserted into (30, 2) and (38,1), and it can be understood that (30, 2) is a second wire layer of the No. 30 wire slot 2, and (38,1) is a first wire layer of the No. 38 wire slot 2, and the position marking mode is adopted below, so that the details are not repeated; and (5) connecting the second ends of the two flat wire conductors positioned at the positions (47, 2) and (38,1), namely, realizing the serial connection of the first flat wire hairpin and the second flat wire hairpin. The span of the third flat wire hairpin is 10, two flat wire conductors are respectively inserted into the (10, 2) and (21, 1), and the second ends of the two flat wire conductors at the (21, 1) and (30, 2) positions are connected, so that the third flat wire hairpin and the second flat wire hairpin are connected in series. The span of the fourth flat wire hairpin is 7, two flat wire conductors are divided into (47,4) and (1, 3), the flat wire conductors at the (1, 3) and (10, 2) are connected, namely, the series connection of the fourth flat wire hairpin and the third flat wire hairpin is realized, the winding of the first circle of the branch is completed, the first circle of the branch is distributed in the first wire layer and the second wire layer of the wire slot 2, and after the winding of the first circle is completed, the branch is transited to the third wire layer. Referring to fig. 3, the second loop of the branch is distributed between the third line layer and the fourth line layer, and the third loop is distributed between the fifth line layer and the sixth line layer. After three circles of anticlockwise winding from inside to outside are completed, the two flat wire conductors of the last flat wire hairpin in the third circle are respectively positioned at (10, 6) and (21, 5), wherein the second end of the flat wire conductor at the (21, 5) is used for being connected in series with the last flat wire hairpin, and the flat wire hairpin at the (10, 6) is used for being connected in series with the first flat wire hairpin of the fourth circle.

The first three turns of the branch are wound in the anticlockwise direction of the stator core 1 and are transited from the innermost layer to the outermost layer of the stator core 1, and from the fourth turn, the outermost layer of the stator core 1 is wound back to the innermost layer in the clockwise direction.

Referring to fig. 3, the starting point of the fourth turn is located at (2, 6), the first flat wire hairpin of the fourth turn is respectively inserted into (2, 6) and (10, 5), and the flat wire conductors out of (2, 6) and (10, 6) are connected in series through the twisted-back wire, so that the series connection of the last flat wire hairpin of the third turn and the first flat wire hairpin of the fourth turn is realized. The two flat wire conductors of the fourth round of second flat wire hairpin are respectively inserted into (19, 6) and (30, 5), the second ends of the flat wire conductors at the (19, 6) and (10, 5) are connected in series, then the subsequent layout of the flat wire hairpin is sequentially completed, and the winding of the fourth round of the branch is completed in the fifth wire layer and the sixth wire layer along the clockwise direction; then transition to the fourth wire layer, continue to finish the winding of the fifth circle in the third wire layer and fourth wire layer along the clockwise direction; then transition to the second layer and continue to complete the winding of the sixth turn in the clockwise direction on the first and second wire layers, the last flat wire of the sixth turn being stuck on (39,2) with one flat wire conductor in series with the last flat wire, the other flat wire conductor being in (47,1) with the position being the end of the branch.

By this winding manner, the coils formed by the branches can be uniformly distributed on the stator core 1 from inside to outside in the radial direction of the stator core 1. The multiple branches of the other phase windings are wound from inside to outside and then from outside to inside, so that each branch of each phase flat wire winding is uniformly distributed from inside to outside along the radial direction of the stator core 1.

Further preferably, each phase flat wire winding comprises three parallel branches, and three flat wire hairpins respectively positioned in the three branches are formed into a hairpin unit as a group, and as shown in fig. 4 and 5, a large-span first hairpin 3 and two small-span second hairpins 4 are included in one hairpin unit.

Specifically, for convenience of distinction, the two second card issuers 4 are respectively denoted as a second card issuer a and a second card issuer B; the method comprises the steps that three hairpins of the same hairpin unit are arranged, wherein two second hairpins A and second hairpins B with small spans (namely, the spans are 7 trunking 2) are arranged in a staggered mode according to the position of one trunking 2, and a first hairpin 3 with the large span (namely, the spans are 10 trunking 2) is arranged on the outer sides of two second hairpins 4 in a straddling mode; namely, three flat wire conductors on one side of the card issuing unit are sequentially provided with a first card issuing 3, a second card issuing A and a second card issuing B from outside to inside, and can be respectively inserted into the adjacent three wire slots 2, while three flat wire conductors on the other side are sequentially provided with the first card issuing 3, the second card issuing B and the second card issuing A from outside to inside, and can be respectively inserted into the adjacent three wire slots 2.

For example, referring to fig. 3, the first hairpin of the V-phase winding may be referred to as the first hairpin 3 being located in the first leg of the V-phase, with the two flat wire conductors inserted in (46,2) and (3, 1), the second hairpin a being located in the second leg, with the two flat wire conductors inserted in (47, 2) and (1, 1), and the second hairpin B being located in the third leg, with the two flat wire conductors inserted in (48,2) and (2, 1).

Further preferably, the plurality of flat wire hairpins positioned in the same branch are arranged in a staggered manner, and two second hairpins 4 with small spans are arranged between two adjacent first hairpins 3 with large spans.

For example, referring to fig. 3, the first four flat wire card-issuing branches of one V-phase are a first card-issuing 3, a second card-issuing 4 and a first card-issuing 3 in this order; the first four flat wire hairpin cards of the second branch are a second hairpin 4, a first hairpin 3 and a second hairpin 4 in sequence; the first four flat wire hairpin of the third branch is sequentially a second hairpin 4, a first hairpin 3, a second hairpin 4 and a second hairpin 4. Therefore, the three flat wire hairpin units which are positioned at the adjacent slot positions and respectively belong to the three branches can form the hairpin unit, so that when the winding is wound, the three flat wire hairpin units can be simultaneously inserted as a group, and the layout efficiency of the flat wire hairpin and the winding efficiency of the winding are improved to a certain extent; meanwhile, the lengths of three branches formed by serially connecting a plurality of flat wire hairpins are equal. It should be noted that, the equality is approximately equal, the number of the first card issuing 3 and the second card issuing 4 included in the three are equal, and the total length after the concatenation is equal theoretically, but there are some dimensional errors unavoidable when the winding and the concatenation are performed through the wire.

In the embodiment of the present utility model, the starting points of the three branches of the V-phase winding are (1, 1), (2, 1) and (3, 1), respectively, and the starting points of the three branches of the two-phase winding are six adjacent positions, for example, the starting points of the three branches of the W-phase winding may be (52, 1), (53,1) and (54,1), the starting points of the three branches of the U-phase winding are (49,1), (50, 1) and (51, 1), and the winding manner of the three branches of the W-phase winding and the three branches of the U-phase winding is the same as that of the V-phase winding, but three wire slots 2 may be sequentially shifted.

Therefore, by adopting the winding mode, the lengths of each branch of each phase winding can be equal, so that the three phases of the flat wire stator are balanced, circulation is avoided, and the types of flat wire hairpin used by the winding mode are fewer than those of flat wire hairpin used by the traditional winding mode.

In one embodiment of the present utility model, it is preferable that the flat wire clips require skew of the flat wire conductors after being threaded into the corresponding wire slots 2 so as to be welded with adjacent flat wire clips to form a series connection.

The flat wire hairpin of the utility model has two skew modes, the first is that the two flat wire conductors of the flat wire hairpin shown in fig. 5 are formed with connection pins 5 which are skimmed to the same side, and the second is that the two flat wire conductors of the flat wire hairpin shown in fig. 4 are respectively formed with connection pins 5 which are skimmed.

Specifically, as described above, after one branch is wound from the inside to the outside of the stator core 1 for three turns, the last flat wire hairpin of the third turn is required to be connected in series with the first flat wire hairpin of the fourth turn through the twisted-back wire, and the last flat wire hairpin of the third turn and the second flat wire hairpin of the fourth turn are located on the same side of the first flat wire hairpin of the fourth turn in the clockwise direction of the stator core 1. The first flat wire card sender of the fourth circle adopts the first bending mode, so that two connecting feet of the flat wire card sender are skimmed to the same side to respectively face to the last flat wire card sender of the third circle and the second flat wire card sender of the fourth circle, and the three are conveniently connected in series.

The other flat wire hairpins are connected with the flat wire hairpins positioned at the two sides of the flat wire hairpins, so that the two connecting feet 5 of the flat wire hairpins are outwards skimmed to respectively clamp the flat wires at the two sides of the flat wire hairpins, and the flat wire hairpins are conveniently connected in series.

The utility model also provides a flat wire motor, which comprises the flat wire stator of any embodiment.

In this embodiment, the flat wire motor includes a flat wire stator, and thus the flat wire motor has all the advantageous effects of the flat wire stator, which are not described in detail herein.

Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present utility model, and not for limiting the same; although the utility model has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the utility model.

Claims (10)

1. The flat wire stator is characterized by comprising a stator core and a flat wire winding;

a plurality of wire grooves are uniformly formed in the inner side of the stator core at intervals along the circumferential direction of the stator core, and a plurality of wire layers are formed in each wire groove along the radial direction of the stator core;

the flat wire windings comprise multiple phases, each flat wire winding comprises multiple branches which are arranged in parallel, each branch surrounds the stator core for multiple circles through multiple wire layers of part of the wire grooves, each branch is gradually wound to the outermost layer from the innermost layer of the stator core, and the branches are reversely wound back to the innermost layer of the stator core from the outermost layer of the stator core after reverse twisting.

2. The flat wire stator of claim 1, wherein the number of wire slots is 54, each wire slot having 6 wire layers;

the flat wire winding is three-phase, and is respectively a V-phase winding, a U-phase winding and a W-phase winding, and each phase of the flat wire winding comprises three branches which are arranged in parallel.

3. The flat wire stator according to claim 2, wherein each of the legs includes a plurality of U-shaped flat wire hair clips connected in sequence;

the flat wire hairpin comprises two flat wire conductors which are arranged at intervals in parallel, the first ends of the two flat wire conductors are connected through a bridging flat wire, and the two flat wire conductors can be respectively inserted into adjacent wire layers of the two wire slots.

4. The flat wire stator according to claim 3, wherein among the plurality of flat wire clips of the same branch, part of the flat wire clips is a first clip, and the other part is a second clip;

the span of the second hairpin is N trunking, the span of the first hairpin is N+3 trunking, wherein N is a positive integer.

5. The flat wire stator according to claim 4, wherein two second hairpin pieces are provided between two adjacent first hairpin pieces among a plurality of flat wire hairpin pieces located in the same branch.

6. The flat wire stator of claim 5 wherein the winding length of each leg of the three-phase flat wire winding is equal.

7. The flat wire stator of claim 5, wherein each phase of the flat wire winding comprises a plurality of card issuing units, each card issuing unit comprises three flat wire card issuing units, and the three flat wire card issuing units of each card issuing unit are respectively positioned in three branches;

the three flat wire hairpins of the same hairpins unit comprise a first hairpin and two second hairpins, the two second hairpins are arranged in a staggered mode according to the position of one wire slot, and the first hairpins are arranged on the outer sides of the two second hairpins in a straddling mode.

8. The flat wire stator of claim 7, wherein the first hairpin has a span of 10 slots and the second hairpin has a span of 7 slots.

9. The flat wire stator according to claim 3, wherein second ends of the two flat wire conductors of the flat wire hairpin are respectively formed with externally-skimmed connection pins;

or the second ends of the two flat wire conductors of the flat wire hairpin are respectively provided with connecting pins which are skimmed to the same side.

10. A flat wire motor comprising the flat wire stator of any one of claims 1 to 9.