CN218549607U - Stator winding structure of flat wire motor - Google Patents

Abstract

The utility model provides a flat wire motor stator winding structure, including stator core and three-phase winding, stator core sets up the wire winding groove of a plurality of equipartitions along the axial, the wire winding groove is the rectangular channel, and inside is inserted and is equipped with the insulating paper that is used for insulating, three-phase winding is around establishing in the wire winding groove, and radially divide into a plurality of layers along stator core. The utility model uses the first winding and the second winding, and uses the mode of outside inlet wire outside outlet wire (or inside inlet wire inside outlet wire mode) in the arrangement and installation of the flat wire motor winding, thus solving the problem that the existing inside inlet wire outside outlet wire and outside inlet wire inside outlet wire cause the difficult connection treatment between the three phases of the winding three-phase end part and the neutral point, the inlet and outlet wires are concentrated, and the occupied space is small; according to the scheme, the inner layer or the outer layer of the anti-twisting hairpin is used, so that the U-shaped hairpin realizes the reversing connection of current in the winding, the bridging of special-shaped lines is replaced, the structure of the outlet end part is simplified, and the connection reliability is improved.

Description

Stator winding structure of flat wire motor

Technical Field

The utility model belongs to the technical field of the motor, in particular to flat-wire motor stator winding structure.

Background

The stator winding of a flat wire motor is generally made into a three-phase winding. The three-phase windings are symmetrically distributed along the stator core, and generate a rotating magnetic field when three-phase alternating current is introduced at an electrical angle of 120 degrees in space difference.

Most of the windings of the existing flat wire motor are led out from the inner side of a stator slot, the outer side of the stator slot is led in, or the inner side of the stator slot is led out, the positions of the lead-in and lead-out wires are scattered, and the occupied end space is large.

SUMMERY OF THE UTILITY MODEL

To the above problem, the utility model provides a flat wire motor stator winding structure.

In order to realize the purpose, the utility model adopts the following technical scheme:

a stator winding structure of a flat wire motor comprises a stator core and a three-phase winding;

the stator core is axially provided with a plurality of uniformly distributed winding slots, each winding slot is a rectangular slot, and insulating paper for insulation is inserted into the winding slot;

the three-phase winding is wound in the winding slot and is divided into a plurality of layers along the radial direction of the stator core;

the three-phase winding comprises a three-phase outgoing line hairpin, a U-shaped hairpin and an anti-twisting hairpin;

the three-phase outgoing line hairpin is connected with the U-shaped hairpin;

the anti-twisting hairpin is connected with the U-shaped hairpin.

Preferably, each of the three phase windings includes a first winding and a second winding;

the first winding takes the three-phase outgoing line hairpin of the first layer as a starting point, and is sequentially connected with a plurality of U-shaped hairpins along the clockwise or anticlockwise direction of the stator iron core until the last layer of anti-torsion hairpins are connected;

the second winding takes the anti-torsion hairpins on the last layer of the first winding as a starting point, and is sequentially connected with a plurality of U-shaped hairpins along the anticlockwise direction or the clockwise direction of the stator core until the U-shaped hairpins are filled in the first layer of the first winding, and the angular distance between the last U-shaped hairpin and the three-phase outgoing line hairpins of the starting point is 45 degrees.

Preferably, the three-phase outgoing line hairpin main body is U-shaped, two ends of a U-shaped opening are provided with first bending parts deviating from each other, and the two first bending parts are respectively connected with first outgoing lines with different lengths;

the U-shaped hairpin main body is U-shaped, two ends of the U-shaped opening are provided with deviated second bending parts, and the two second bending parts are connected with second outgoing lines with equal or different lengths;

the anti-hair clip main part of turning round is the U-shaped, and U-shaped opening both ends are provided with syntropy third inflected part, two third inflected part all is provided with the third lead-out wire that length equals.

Preferably, the three-phase outgoing line hair clip, the U-shaped hair clip and the U-shaped main body of the anti-twisting hair clip are inserted into the winding grooves;

the three-phase outgoing line hairpin is welded and connected with the U-shaped hairpin through a first outgoing line and a second outgoing line which are stacked mutually;

the two U-shaped hairpins are connected through the second lead-out wires which are stacked mutually in a welding mode;

the U-shaped hair clip and the anti-twisting hair clip are connected through a second outgoing line and a third outgoing line which are stacked mutually in a welding mode.

Preferably, the closed ends of the three-phase outgoing line hairpin, the U-shaped hairpin and the anti-twist hairpin are positioned at one end of the stator core to form a hairpin end;

and one sides of the openings of the phase leading-out wire hairpin, the U-shaped hairpin and the anti-twisting hairpin are all positioned at the other end of the stator core to form a welding end.

Preferably, the three-phase winding is further connected with a three-phase copper bar.

Preferably, the three-phase copper bar comprises a U-phase copper bar, a V-phase copper bar and a W-phase copper bar;

the U-phase copper bar is arc-shaped, and a first wiring end and at least two first contact lines are respectively arranged at two ends of the U-phase copper bar;

the V-phase copper bar is arc-shaped, and a second wiring end and at least two second contact lines are respectively arranged at two ends of the V-phase copper bar;

the W-phase copper bar is arc-shaped, and a third wiring end and at least two third contact lines are arranged at two ends of the W-phase copper bar respectively.

Preferably, the first contact line, the second contact line and the third contact line respectively correspond to each phase winding in the three-phase windings, and are respectively welded with the first outgoing line of the three-phase outgoing line hairpin in each phase winding.

Preferably, a neutral bar is connected to the three-phase winding.

Preferably, the neutral row is arc-shaped, three groups of neutral lines are fixedly connected along the intrados, and each group comprises at least two neutral lines;

and each group of neutral wires are respectively welded with the second lead-out wires of the last two U-shaped hairpins of the second winding in each phase of winding.

The utility model has the advantages that:

the utility model uses the first winding and the second winding, and uses the external wire inlet external wire outlet mode (or the internal wire inlet internal wire outlet mode) in the arrangement and installation of the flat wire motor winding, thus solving the problem that the connection processing between the three phases of the winding three-phase end part and the neutral point is difficult due to the external wire outlet of the internal wire inlet and the internal wire outlet of the external wire inlet, and the wire inlet and outlet positions are concentrated and the occupied space of the end part is small; according to the scheme, the inner layer or the outer layer of the anti-twisting hairpin is used, so that the U-shaped hairpin realizes the reversing connection of current in the winding, the bridging of special-shaped lines is replaced, the structure of the outlet end part is simplified, and the connection reliability is improved.

Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by the practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 shows an assembly view of a stator winding structure of a flat wire motor according to the present invention;

fig. 2 shows a single-phase winding schematic diagram of a stator winding structure of a flat-wire motor according to the present invention;

FIG. 3 shows an enlarged view of area A of FIG. 2;

fig. 4 shows a schematic structural diagram of the three-phase outgoing line card clip of the present invention;

FIG. 5 is a schematic view of the U-shaped hairpin of the present invention;

fig. 6 shows a schematic structural diagram of the anti-twist hairpin of the present invention;

fig. 7 shows a schematic structural diagram of a U-phase copper bar of the present invention;

fig. 8 shows a schematic structural diagram of a V-phase copper bar of the present invention;

fig. 9 shows a schematic structural diagram of a W-phase copper bar of the present invention;

fig. 10 shows a schematic structural view of a neutral bank of the present invention;

fig. 11 shows a schematic diagram of the installation of a three-phase outgoing line hairpin and a three-phase copper bar;

FIG. 12 shows a schematic view of the installation of a U-shaped hair card;

FIG. 13 shows a schematic of the installation of an anti-twist hairpin;

FIG. 14 shows a schematic view of the installation of the U-shaped hair clip and neutral bar;

figure 15 shows a three-phase winding development of the present invention;

fig. 16 shows a development of the single-phase winding of the present invention.

In the figure: 1. a stator core; 2. insulating paper; 3. a card issuing end; 4. welding the end; 5. neutral row; 501. a neutral line; 6. a winding slot; 7. u-phase copper bars; 701. a first contact wire; 702. a first terminal; 8. three-phase outgoing line hairpin; 801. a first bending portion; 802. a first outgoing line; 9. a U-shaped hairpin; 901. a second bending portion; 902. a second outgoing line; 10. reversely twisting the hairpin; 1001. a third bent portion; 1002. a third outlet; 11. v-phase copper bars; 1101. a second contact wire; 1102. a second terminal; 12. w-phase copper bars; 1201. a third contact line; 1202. and a third terminal.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention are clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

The utility model provides a flat wire motor stator winding structure, as shown in figure 1, including stator core 1 and three-phase winding, wherein, stator core 1 sets up the wire winding groove 6 of a plurality of equipartitions along the axial, three-phase winding is around establishing in wire winding groove 6, and radially divide into a plurality of layers along stator core 1, three-phase winding includes three-phase lead-out wire hairpin 8, U-shaped hairpin 9 and anti-hair of wriggling card 10, three-phase lead-out wire hairpin 8 is connected with U-shaped hairpin 9 for introduce three-phase winding with electric current, anti-hair of wriggling card 10 is connected with U-shaped hairpin 9, a current for three-phase winding trades.

In consideration of insulation, the insulation paper 2 with a certain length and thickness is inserted into each winding slot 6, the number of the winding slots 6 is 48 or 64, then a three-phase winding is wound in each winding slot 6, and the three-phase winding is radially divided into a plurality of layers along the stator core 1.

The stator core 1 is formed by laminating a plurality of silicon steel sheets, and may be riveted, welded, or bonded, and includes a stator yoke, a stator tooth portion, and a stator tooth head portion.

In addition, as shown in fig. 2, each phase winding in the three-phase windings includes a first winding and a second winding, wherein the first winding uses the three-phase outgoing line hairpin 8 of the first layer as a starting point, and is sequentially connected with a plurality of U-shaped hairpins 9 along the clockwise or counterclockwise direction of the stator core 1 until being connected with the anti-twist hairpins 10 of the last layer;

the second winding takes the anti-torsion hair clip 10 on the last layer of the first winding as a starting point, and is sequentially connected with a plurality of U-shaped hair clips 9 along the anticlockwise direction or the clockwise direction of the stator core 1 until the U-shaped hair clips 9 are filled in the first layer of the first winding, and the angular distance between the last U-shaped hair clip 9 and the three-phase outgoing line hair clip 8 of the starting point is 45 degrees.

It should be noted that the three-phase outlet hairpin 8 and the U-shaped hairpin 9 are typically grouped in sets of two, so that in practice the angular distance between the first three-phase outlet hairpin 8 and the penultimate U-shaped hairpin 9 is 45 °.

As shown in fig. 4, the three-phase outgoing line hairpin 8 has a U-shaped main body, two ends of the U-shaped opening are provided with first bending portions 801 which are separated from each other, and the two first bending portions 801 are respectively connected to first outgoing lines 802 which are different in length.

As shown in fig. 5, the U-shaped hairpin 9 has a U-shaped main body, two ends of the U-shaped opening are provided with second bending portions 901 which are deviated from each other, and the two second bending portions 901 are connected to second outgoing lines 902 which have the same or different lengths.

Referring to fig. 14, the lengths of the second lead lines 902 of the U-shaped hairpin 9 are different when connected to the neutral row 5, and the lengths of the second lead lines 902 of the U-shaped hairpin 902 are otherwise equal.

As shown in fig. 6, the anti-twisting hairpin 10 has a U-shaped main body, third bent portions 1001 in the same direction are provided at both ends of the U-shaped opening, and third lead lines 1002 having the same length are provided on both of the third bent portions 1001.

Furthermore, the closed ends of the three-phase outgoing line hairpin 8, the U-shaped hairpin 9 and the anti-twisting hairpin 10 are all positioned at one end of the stator core 1 to form a hairpin end 3; then, the open sides of the three-phase outgoing line hairclip 8, the U-shaped hairclip 9 and the anti-twist hairclip 10 are all positioned at the other end of the stator core 1 to form a welding end 4.

Further, the U-shaped main bodies of the three-phase outgoing line hairpins 8, the U-shaped hairpins 9 and the anti-twisting hairpins 10 are inserted into the winding grooves 6;

the three-phase outgoing line hairpin 8 and the U-shaped hairpin 9 are connected by welding through a first outgoing line 802 and a second outgoing line 902 which are stacked with each other;

the two U-shaped haircards 9 are connected by welding through second outgoing lines 902 which are stacked mutually;

the U-shaped hair card 9 and the reverse twist hair card 10 are connected by soldering through the second outgoing line 902 and the third outgoing line 1002, which are stacked on each other.

It should be noted that each of the three-phase winding outgoing line hairpin 8, the U-shaped hairpin 9, and the anti-twist hairpin 10 is a flat copper conductor, 2n (n is a natural number) flat copper conductors can be inserted into each winding slot 6, and in addition, in order to achieve electrical connection between the flat copper conductors in the winding slot 6, it is necessary to connect by means of hairpin or welding, thereby forming the three-phase outgoing line hairpin 8, the U-shaped hairpin 9, and the anti-twist hairpin 10.

Taking the stator core 1 with 48 winding slots 6 as an example, one phase of a three-phase winding will be described:

referring to fig. 2 and 3, starting from the three-phase outgoing line hairpin 8, a U-shaped body is inserted into the winding slot 6, the U-shaped body may have a plurality of spans, for example, 6 spans, or a combination of 5 spans and 7 spans, and then the three-phase outgoing line hairpin 8 starts to connect the U-shaped hairpin 9, which is regularly distributed in the circumferential direction of the stator core 1 according to the spans. Each slot can be inserted with 2n U-shaped bodies, and each slot has n layers of U-shaped bodies (two stacked U-shaped bodies are taken as one layer), wherein n =3 in fig. 2 is set to be an outer layer close to the bottom of the winding slot 6 and an inner layer close to the opening of the winding slot 6. The U-shaped hairpins 9 are inserted into the winding slots 6 at regular intervals, and are switched to the next pair of adjacent layers for cyclic installation and arrangement until one circumference is finished, so that the U-shaped hairpins 9 are inserted clockwise or anticlockwise to form one circumference and then are connected with the U-shaped hairpins 9 on the second layer, then after the second layer forms one circumference, the last U-shaped hairpins 9 on the second layer are connected with the U-shaped hairpins starting from the third layer, and according to the rule, the circumference is formed until the third layer forms one circumference, the tail of the third layer adopts the anti-twisting hairpins 10, and the coils from the three-phase outgoing line hairpins 8 to the anti-twisting hairpins 10 form a first winding.

The reverse-twisted hairpin 10 will change the insertion direction of the U-shaped hairpin 9, and the second winding will start with the reverse-twisted hairpin 10 and insert the U-shaped hairpin 9 in the opposite direction, for example, the first winding will be clockwise, then the second winding will be counter-clockwise, and after the last layer has formed a circle with the same span as the first winding, the last layer of tail U-shaped hairpin 9 will connect with the penultimate layer of U-shaped hairpin 9 until connecting to the first layer, forming a circle with the first layer.

It should be noted that the advantage of such winding is that the first outgoing line 802 of the three-phase outgoing hairpin and the second outgoing line 902 of the U-shaped hairpin 9 are gathered together at the stator core 1 side and are converged together.

The first lead-out wires 802 of the three-phase winding are generally disposed on the outermost layer of the winding slot 6.

In the reverse connection of the U-shaped hair clip 9, the anti-twist hair clips 10 are used, and the anti-twist hair clips 10 are located at the innermost layer or the outermost layer of the winding slot 6.

<xnotran> , 3 , UVW 2 , , 8 U 9 1a → 1b → 1a → 1b → 1a → 1b → 1a → 1b ( 6 U 9 8), → 2a → 2b → 2a → 2b → 2a → 2b → 2a → 2b ( 8 U 9), 3a → 3b → 3a → 3b → 3a → 3b ( 6 U 9), 10 → 3b → 3a → 3b → 3a → 3b → 3a ( 8 U 9), → 2b → 2a → 2b → 2a → 2b → 2a → 2b → 2a ( 8 U 9), 1b → 1a → 1b → 1a → 1b → 1a ( 8 U 9), 501, 5 U, V, W . </xnotran>

Further, in fig. 1, the three-phase winding is further connected with a three-phase copper bar, and the three-phase copper bar includes a U-phase copper bar 7, a V-phase copper bar 11 and a W-phase copper bar 12; as shown in fig. 7, the U-phase copper bar 7 is arc-shaped, and two ends of the U-phase copper bar are respectively provided with a first terminal 702 and at least two first contact lines 701.

As shown in fig. 8, the V-phase copper bar 11 is arc-shaped, and both ends are respectively provided with a second terminal 1102 and at least two second contact wires 1101.

As shown in fig. 9, the W-phase copper bar 12 is arc-shaped, and both ends are respectively provided with a third terminal 1202 and at least two third contact wires 1201.

Further, the first contact wire 701, the second contact wire 1101, and the third contact wire 1201 correspond to each phase winding of the three-phase windings, and are respectively welded to the first outgoing wire 802 of the three-phase outgoing wire hairpin 8 of each phase winding, and as can be seen from fig. 11, the longer first outgoing wire 802 is connected to the three-phase copper bar.

With reference to fig. 1 and 10, the three-phase winding is further connected with a neutral bar 5, the neutral bar 5 is arc-shaped, three groups of neutral wires 501 are fixedly connected along an inner arc surface, each group includes at least two neutral wires 501, each group of neutral wires 501 is respectively welded to the second outgoing lines 902 of the last two U-shaped hairpins 9 of the second winding in each phase of winding, and in addition, one end of the neutral bar 5 in fig. 10 is tilted, so that the neutral bar 5 can be conveniently taken or moved during welding, and the position of the neutral bar 5 can be adjusted.

As shown in fig. 11, the U-phase copper bar 7, the V-phase copper bar 11 and the W-phase copper bar 12 are respectively connected with two three-phase outgoing line hairpins 8, then, with reference to fig. 12, the three-phase outgoing line hairpins 8 are used as starting points to be connected with the U-shaped hairpins 9, then, with reference to fig. 13, the U-shaped hairpins 9 are finally connected with the reverse-twist hairpins 10 for commutation, then, as shown in fig. 14, the U-shaped hairpins 9 in the three-phase winding are finally gathered at the position of the neutral bar 5, and the U-phase copper bar 7, the V-phase copper bar 11, the W-phase copper bar 12 and the neutral bar 5 are gathered together.

As shown in fig. 15, in the figure, A1+ and A2+ represent outgoing lines on a single-phase (U-phase, V-phase or W-phase) copper bar, A1-and A2-represent neutral lines 501 on a neutral line 5, numerals 1-48 represent 48 winding slots 6, and the span in the figure is 6.

As shown in FIG. 16, A1+, A2+, B1+, B2+, C1+ and C2+ in the figure represent leading-out wires of three-phase copper bars, A1-, A2-, B1-, B2-, C1-and C2-represent neutral wires 501 on a neutral row 5, numbers 1-48 represent 48 winding slots 6, and the span in the figure is 6.

Although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention in its corresponding aspects.

Claims (10)

1. A stator winding structure of a flat wire motor is characterized by comprising a stator iron core (1) and a three-phase winding;

the stator core (1) is axially provided with a plurality of uniformly distributed winding slots (6), the winding slots (6) are rectangular slots, and insulating paper (2) for insulation is inserted in the winding slots (6);

the three-phase winding is wound in the winding slot (6) and is divided into a plurality of layers along the radial direction of the stator core (1);

the three-phase winding comprises a three-phase outgoing line hairpin (8), a U-shaped hairpin (9) and an anti-twisting hairpin (10);

the three-phase outgoing line hairpin (8) is connected with the U-shaped hairpin (9);

the anti-twisting hairpin (10) is connected with the U-shaped hairpin (9).

2. The flat wire motor stator winding structure according to claim 1, wherein each of the three phase windings includes a first winding and a second winding;

the first winding takes the three-phase outgoing line hairpin (8) of the first layer as a starting point, and is sequentially connected with a plurality of U-shaped hairpins (9) along the clockwise or anticlockwise direction of the stator core (1) until the last layer of anti-torsion hairpins (10) is connected;

the second winding takes the anti-torsion hair clip (10) on the last layer of the first winding as a starting point, and is sequentially connected with a plurality of U-shaped hair clips (9) along the anticlockwise direction or the clockwise direction of the stator core (1) until the U-shaped hair clips (9) are filled in the first layer of the first winding, and the angular distance between the last U-shaped hair clip (9) and the three-phase outgoing line hair clip (8) of the starting point is 45 degrees.

3. The flat-wire motor stator winding structure according to claim 1 or 2, characterized in that the three-phase outgoing line hairpin (8) main body is U-shaped, two ends of the U-shaped opening are provided with first bending parts (801) which are deviated from each other, and the two first bending parts (801) are respectively connected with first outgoing lines (802) with different lengths;

the U-shaped hairpin (9) main body is U-shaped, two ends of a U-shaped opening are provided with deviated second bending parts (901), and the two second bending parts (901) are both connected with second outgoing lines (902) with equal or unequal lengths;

the anti-twisting hair clip (10) main body is U-shaped, and U-shaped opening both ends are provided with syntropy third turn curved part (1001), two third turn curved part (1001) all are provided with third lead-out wire (1002) that length equals.

4. The flat wire motor stator winding structure according to claim 3, wherein the U-shaped main bodies of the three-phase outgoing line hairpins (8), the U-shaped hairpins (9) and the anti-twist hairpins (10) are inserted into the winding slots (6);

the three-phase outgoing line hairpin (8) and the U-shaped hairpin (9) are connected through a first outgoing line (802) and a second outgoing line (902) which are stacked mutually in a welding manner;

the two U-shaped hairpins (9) are connected in a welding mode through second outgoing lines (902) which are stacked mutually;

the U-shaped hair clip (9) and the anti-twist hair clip (10) are connected through welding through a second outgoing line (902) and a third outgoing line (1002) which are stacked mutually.

5. The flat wire motor stator winding structure according to claim 4, wherein the closed ends of the three-phase outgoing line hairpins (8), the U-shaped hairpins (9) and the anti-twisting hairpins (10) are all positioned at one end of the stator core (1) to form a hairpin end (3);

and the opening sides of the phase leading-out line hairpin (8), the U-shaped hairpin (9) and the anti-torsion hairpin (10) are all positioned at the other end of the stator core (1) to form a welding end (4).

6. The flat-wire motor stator winding structure according to claim 5, wherein the three-phase winding is further connected with a three-phase copper bar.

7. The flat-wire motor stator winding structure according to claim 6, wherein the three-phase copper bar comprises a U-phase copper bar (7), a V-phase copper bar (11) and a W-phase copper bar (12);

the U-phase copper bar (7) is arc-shaped, and a first wiring terminal (702) and at least two first contact lines (701) are respectively arranged at two ends of the U-phase copper bar;

the V-phase copper bar (11) is arc-shaped, and a second terminal (1102) and at least two second contact lines (1101) are respectively arranged at two ends of the V-phase copper bar;

the W-phase copper bar (12) is arc-shaped, and a third wiring terminal (1202) and at least two third contact wires (1201) are arranged at two ends of the W-phase copper bar respectively.

8. The stator winding structure of the flat wire motor according to claim 7, wherein the first contact wire (701), the second contact wire (1101) and the third contact wire (1201) correspond to each phase winding of the three-phase windings respectively and are welded with the first outgoing wire (802) of the three-phase outgoing wire hairpin (8) of each phase winding respectively.

9. A flat wire motor stator winding arrangement according to claim 3, characterized in that a neutral bar (5) is connected to the three-phase winding.

10. The flat-wire motor stator winding structure according to claim 9, characterized in that the neutral row (5) is arc-shaped, three groups of neutral wires (501) are fixedly connected along the intrados, and each group comprises at least two neutral wires (501);

and each group of neutral wires (501) are respectively welded with the second outgoing lines (902) of the last two U-shaped hairpins (9) of the second winding in each phase winding.

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