KR100450897B1 - Stator of dynamo-electric machine - Google Patents

Abstract

The present invention prevents short-circuit accidents attributable to the joint and obtains a stator of a rotating electric machine having excellent insulation.

In the coil end group 16f, the joining portions 41 between the turn portions 40b of the first conducting wire segment 40A and the end portions 40a of the second conductor segment 40B are aligned in a row in a radial direction. And arranged in two rows in the circumferential direction.

On the other hand, in the coil end group 16r, the joint part 41 of the edge part 40b of the 1st conductor segment 40A, and the turn part 40b of the 2nd conductor segment 40B are adjacent to each other in the radial direction, and 1 is carried out. They are arranged in rows, arranged in two rows, and arranged in the circumferential direction.

Description

Stator of rotating electric machine {STATOR OF DYNAMO-ELECTRIC MACHINE}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stator of a rotating electric machine, and more particularly to a stator structure of an alternator driven by an internal combustion engine, for example a stator structure of a vehicle alternator that can be mounted in a car or truck.

Fig. 15 is a schematic perspective view showing a conductor segment constituting a stator winding in a stator of a conventional vehicular alternator described in, for example, Japanese Patent Laid-Open No. 11-164506, and Fig. 16 is a conventional vehicular alternator shown in Fig. 15. A schematic diagram showing a coil end group in a stator of FIG. 17 is a schematic diagram illustrating an arrangement state of a junction portion of coil end groups in a stator of the conventional automotive alternator shown in FIG. 15.

In Fig. 15, the first conductor segment 331 is formed by bending a cross-sectional spherical copper material coated with an insulating coating, and is formed by connecting a pair of straight portions 331a and 331b by a turn portion 331c. It is molded in a U shape.

The second conductor segment 332 is formed by bending a cross-sectional spherical copper material coated with an insulating coating, and is formed into a substantially U shape in which a pair of straight portions 332a and 332b are connected by a turn portion 332c. have.

In the stator 100 of the related art, the pair of the first and second conductor segments 331 and 332 configured as described above is inserted at each end of the stator core in each pair of slots spaced apart by one magnetic pole of the stator core 101.

In each slot, four straight portions 331a, 332a, 332b, and 331b are arranged in a row in the radial direction (slot depth direction).

Here, for convenience of description, the positions of the linear portions in the slots are referred to as addresses 1, 2, 3 and 4 on the inner circumferential side.

As shown in FIG. 15, the end portion 331d of the first conductor segment 331 extending toward the other end side of the stator core 101 at one address of one slot is spaced apart by one magnetic pole in the clockwise direction, for example. It is joined by welding to the end 332d of the second conductor segment 332 which extends to the other end side of the stator core 101 at the second address of the slot, and extends to the other end side of the stator core 101 at the third address of one slot. The end 332e of the second conductor segment 332 which is present is, for example, an end of the first conductor segment 331 which extends to the other end side of the stator core 101 at the fourth address of the slot away from one magnetic pitch in the clockwise direction. It is joined to 331e by welding, and four winding turns of superposition are formed in each phase.

The stator winding 102 is configured by alternating three-phase lap-wound windings.

In the stator 100 configured as described above, as shown in FIGS. 16 and 17, the coil end group 102a of the stator winding 102 on the one end side of the stator core 101 is formed of the first conductor segment 331. The turn part 331c becomes two layers so that the turn part 332c of the 2nd conductor segment 332 may be arrange | positioned with respect to an axial direction, and is arrange | positioned in the circumferential direction, and is comprised.

Moreover, in the coil end group 102b of the stator winding 102 of the stator winding side of the stator core, the junction part 334a of the edge part 331d, 332d, and the junction part 334b of the edge part 331e, 332e are axial direction. The height is the same, and it arranges in two layers adjacent to one row in the radial direction, and arranged in two rows in the circumferential direction.

However, in the coil end group 102b of the stator winding 102 of this conventional stator 100, the joining portions 334a and 334b are arranged in two layers adjacent to one row in the radial direction with the same axial height. Since two rows are arranged in the circumferential direction, there is a problem that the radial distance between the joint portions 334a and 334b where the insulating film is lost by welding is short, and short-circuit accidents are likely to occur.

Moreover, since the joining parts 334a and 334b have the same axial height and are adjacent in the radial direction, it is difficult to weld and there is also a problem that welding workability is lowered.

Therefore, in order to solve the said problem, the improvement plan which moves and arrange | positions the junction part 334a, 334b to the circumferential direction is proposed by Unexamined-Japanese-Patent No. 2000-166150, for example.

18 is a schematic perspective view showing a conductor segment constituting a stator winding in a stator of a conventional vehicular alternator as an improvement described in, for example, Japanese Patent Laid-Open No. 2000-166150; FIG. 19 is a vehicular alternating vehicular shown in FIG. The partial side view which expands the stator of a generator and viewed it from the inside diameter side, FIG. 20 is a schematic diagram explaining the arrangement state of the junction of the coil end groups in the stator of the conventional automotive alternator shown in FIG.

In the stator 100A as an improvement, the first and second conductor segments extending toward the other end side of the stator core 101 when welding the end portions 331d, 332d, 331e, and 332e as shown in FIGS. 18 and 19. The inclination angles at the end sides of the 331 and 332 are changed so that the joint portions 334a and 334b move by W in the circumferential direction.

As a result, in the coil end group 102b of the stator winding 102 on the other end side of the stator core 101, the joint portions 334a and 334b have the same axial height, and the circumferential direction is shown in FIG. It consists of two rows arranged in the circumferential direction with only W moving.

The stator 100A is configured in the same shape as the stator 100 except that the joints 334a and 334b are moved by the w in the circumferential direction.

Also, for example, Japanese Patent Laid-Open No. 2000-166150 discloses a conventional stator structure constructed using the first, second and third conductor segments 331, 332 and 333.

In this stator 100B, as shown in Figs. 21 and 22, the coil end group 102a of the stator winding 102 has three layers of turn portions 331c, 332c, and 333c in the axial direction and is arranged in the circumferential direction. In the coil end group 101b, the joining portions 334a, 334b, and 334c have the same axial height, are moved by w in the circumferential direction, and arranged in the circumferential direction in three rows.

In the stator 100A or 100B configured as described above, the joint is moved in the circumferential direction, so that the distance between the joints is increased, the short circuit accident between the joints where the insulating film is lost by welding can be suppressed, and the welding workability can be improved. There is a number.

In the stator 100 of a conventional alternating current generator for a vehicle, in the coil end group 102b of the stator winding 102, the joints 334a and 334b have the same axial height, and are adjacent to one row in the radial direction in two layers. Since they are aligned and arranged in two rows in the circumferential direction, there is a problem that the radial distance between the joint portions 334a and 334b where the insulating film is lost by welding is short, and short-circuit accidents are likely to occur.

Moreover, since the joining parts 334a and 334b are adjacent in the radial direction with the same axial height, there is also a problem that welding is difficult and welding workability is deteriorated.

In the stator 100A, 100B of the conventional automotive alternator, the joints 333a, 333b, 333c have the same axial height, move in the circumferential direction by w, and become two rows (three rows) in the circumferential direction. Since it is arranged and arranged, the distance between joining parts becomes long, the short circuit accident between joining parts can be suppressed, and welding workability can be improved.

However, in the stator (100, 100A, 100B) of the conventional automotive alternator, the coil end group (102b) is composed of two or three rows in the circumferential direction of the joint portion at the same axial height, so that Accordingly, there is a risk that the joints may be short-circuited and the insulation deteriorates.

Moreover, since the axial height of each junction part is comprised the same, the more the number of columns of a circumferential direction becomes, the easier it will become to short-circuit between junctions, and the weldability will deteriorate and it will become the structure unsuitable for the structure of deterioration.

An object of the present invention is to obtain a stator of a rotary electric machine which can arrange a junction of a wire adjacent to a turn in a radial direction to solve the above problems, eliminate a short circuit accident caused by the junction, and improve insulation. It is done.

Moreover, the junction part of a wire is arrange | positioned adjacent to a turn part or another junction part with respect to the radial direction, and the axial height between a junction part and the turn part or another junction part which adjoins the said junction part in the radial direction differs, and a short circuit resulting from a junction part It is an object of the present invention to obtain a stator of a rotary electric machine capable of eliminating accidents, improving insulation and improving welding workability.

The stator of the rotary electric machine according to the present invention comprises a stator winding formed by joining a plurality of stator cores provided with a plurality of slots in the circumferential direction and a plurality of wires mounted in the slots on a cross section of the stator core for each predetermined number of slots. In the stator of the rotating electric machine, a coil end group of the stator windings extends from a joint portion connecting the wires to each other on a cross section of the stator iron core, and a slot extending from one slot away from a predetermined slot on the cross section of the stator iron core. It consists of the turn part of the said wire which enters into the slot of the said at least one part of the said coil end group, The said junction part is arrange | positioned adjacent to the said turn part with respect to the radial direction.

In the stator of a rotary electric machine comprising a stator core having a plurality of slots in the circumferential direction and a stator winding formed by joining a plurality of wires mounted in the slot on a cross section of the stator core for each predetermined number of slots. The coil end group of the stator windings is composed of a joining portion for connecting the wires to each other on the cross section of the stator core, and a turn portion of the wire which is stiffened from one slot away from the predetermined slot on the cross section of the stator core and enters the other slot. The joining portion is disposed adjacent to the turn portion or the other joining portion with respect to the radial direction, and the axial height of the turn portion or the other joining portion that is radially adjacent to the joining portion and the joining portion is different.

Moreover, in at least one of the coil end groups of the stator windings, the junction part or the junction part and the turn part are arranged in three or more layers in a row in the radial direction.

Further, in at least one of the coil end groups of the stator windings, the turn portions are arranged adjacent to the junction portion on the inner diameter side and the outer diameter side in the radial direction and arranged in three layers in one row in the radial direction, and the axial height of the junction portion. Is formed higher than the axial height of the turn portion.

Moreover, insulating resin is arrange | positioned so that the said junction part may be covered.

The insulating resin is disposed between the joining portions adjacent to each other in the radial direction and between the joining portions and the turn portions.

The varnish is applied to the coil end group.

Moreover, in at least one of the said coil end groups, the said turn part is located in the outermost diameter position with respect to the radial direction.

Moreover, the said junction part located in the outermost diameter position with respect to the radial direction is comprised low in the axial direction with respect to the said junction part or the said turn part adjacent to the radial direction.

BRIEF DESCRIPTION OF THE DRAWINGS It is a longitudinal cross-sectional view which shows the automotive alternator which concerns on Embodiment 1 of this invention.

FIG. 2 is a rear side cross-sectional view illustrating a connection state of a stator winding for one phase in a stator applied to an automotive alternator according to Embodiment 1 of the present invention. FIG.

3 is a schematic perspective view showing a conductor segment constituting a stator winding in the stator of the vehicular alternator according to Embodiment 1 of the present invention.

Fig. 4 is a schematic diagram showing a coil end group in the stator of the vehicular alternator according to Embodiment 1 of the present invention.

Fig. 5 is a schematic diagram showing a conductor segment constituting a stator winding in the stator of the vehicular alternator according to Embodiment 2 of the present invention.

6 is a schematic perspective view showing a conductor segment constituting a stator winding in the stator of the vehicular alternator according to Embodiment 3 of the present invention.

Fig. 7 is a schematic diagram showing a coil end group in the stator of the vehicular alternator according to Embodiment 3 of the present invention.

Fig. 8 is a schematic diagram showing a coil end group in the stator of the vehicular alternator according to Embodiment 4 of the present invention.

Fig. 9 is a schematic diagram showing a coil end group in the stator of the vehicular alternator according to Embodiment 6 of the present invention.

10 is a schematic perspective view showing a conductor segment constituting a stator winding in the stator of the vehicular alternator according to Embodiment 7 of the present invention.

Fig. 11 is a schematic diagram showing a coil end group in the stator of the vehicular alternator according to Embodiment 7 of the present invention.

It is a schematic diagram which shows the coil end group in the fixture of the vehicular alternator which concerns on Embodiment 8 of this invention.

It is a perspective view which shows the stator of the vehicular alternator which concerns on Embodiment 9 of this invention.

Fig. 14 is a schematic diagram showing a coil end group in the stator of the vehicular alternator according to Embodiment 9 of the present invention.

15 is a schematic perspective view showing a conductor segment constituting a stator winding in a stator of a conventional automotive alternator.

Fig. 16 is a schematic diagram showing a coil end group in a stator of a conventional automotive alternator.

It is a schematic diagram explaining the arrangement | positioning part of the junction part of the coil end group in the stator of the conventional automotive alternator.

18 is a schematic perspective view showing a conductor segment constituting a stator winding in a stator of another conventional automotive alternator.

Fig. 19 is a partial side view seen from the inner diameter side where the stator of another conventional automotive alternator is developed.

It is a schematic diagram explaining the arrangement | positioning part of the junction part of the coil end group in the stator of another conventional automotive alternator.

Fig. 21 is a schematic diagram illustrating an arrangement state of a junction portion of coil end groups in a stator of still another vehicular alternator for vehicles.

Fig. 22 is a schematic diagram showing a coil end group in a stator of still another vehicular alternator for vehicles.

<Description of the symbols for the main parts of the drawings>

8,8A, 8C, 8D, 8E, 8F, 8G. Stator 15. Stator core

15a. slot

16, 16A, 16B, 16C, 16D, 16E, 16F, 16G. Stator winding

16f, 16r. Coil end group

40A. First conductor segment (wire)

40B. Second conductor segment (wire)

40C. Third conductor segment (wire) 40b. Turn

41. Junction 42. Insulating resin

45A. First conductor segment (wire)

45B. Second conductor segment (wire)

45C. Third conductor segment (wire)

45b. Turn section 46. Wire

46a. Turn

EMBODIMENT OF THE INVENTION Next, embodiment of this invention is described according to drawing.

Embodiment 1

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a longitudinal sectional view showing a vehicular alternator according to Embodiment 1 of the present invention, and Fig. 2 shows a connection state of a stator winding of one phase in a stator applied to the vehicular alternator according to Embodiment 1 of the present invention. 3 is a schematic perspective view showing a conductor segment constituting a stator winding in a stator of a vehicular alternator according to Embodiment 1 of the present invention, and FIG. 4 is a vehicle perspective view according to Embodiment 1 of the present invention. It is a schematic diagram which shows the coil end group in the stator of an alternator.

In addition, in FIG. 2, the solid line shows the coil end part of a rear side, and the dotted line shows the coil end part of a fret side.

In Fig. 1, a vehicle alternator is provided with a case (3) composed of an aluminum front bracket (1) and a rear bracket (2), and a shaft having a pulley (4) fixed in one end of the case (3). 6), a Lundell-type rotor 7 fixed to the shaft 6, a fan 5 fixed to both ends of the rotor 7 in the axial direction, and the rotor 7 A stator 8 fixed to the case 3 so as to surround the slip ring 9, a slip ring 9 for supplying current to the rotor 7 at the other end of the shaft 6, and a surface of the slip ring 9; A pair of brushes 10 to be slid, a brush holder 11 accommodating the brush 10, and a rectifier 12 electrically connected to the stator 8 and rectifying alternating current generated by the stator 8 with a direct current. And a regulator 18 fitted to the brush holder 11 to adjust the magnitude of the alternating voltage generated by the stator 8.

The rotor 7 is provided so as to cover the field coil 13 and the field coil 13 to generate a magnetic flux by passing a current, and the first and second pole core bodies having magnetic poles formed by the magnetic flux ( 20 and 21 are provided.

The first and second pole core bodies 20 and 21 are made of iron, and the claw-shaped magnetic poles 22 and 23, each having an outermost mirror shape with a substantially trapezoidal shape, have an equiangular pitch in the circumferential direction at the circumferential edge portion. It protrudes and is fixed to the axis | shaft 6 so that the said claw-type magnetic poles 22 and 23 may oppose.

The stator 8 is composed of a cylindrical stator core 15 formed by stacking magnetic steel sheets and a stator winding 16 recommended for the stator core 15.

In the stator 8, the coil end groups 16f and 16r on the front side and the rear side of the stator winding 16 are radially outward of the shoulder portions of the first and second pole core bodies 20 and 21. It is arranged to be located.

In the front bracket 1 and the rear bracket 2, the intake holes 1a and 2a are formed in the axial end face, and the exhaust holes 1b and 2b are provided in the coil end group 16f and 16r in the radial side surface. It is formed so as to deal with.

Therefore, as the rotor 7 rotates, the fan 5 is driven to rotate, and outside air is sucked into the case 3 from the intake holes 1a and 2a and flows to the rotor 7 side in the axial direction. The fan 5 is bent in the centrifugal direction, and then a cooling air flow path is formed to cool the coil end groups 16f and 16r and exhaust them from the exhaust holes 1b and 2b to the outside.

Here, the stator winding group for one phase which comprises the stator winding 16 is demonstrated, referring FIG.

Here, the number of magnetic poles of the stator 7 is 12, and the stator core 15 is arranged so as to be aligned in the circumferential direction so that 36 slots 15a are opened on the inner circumferential side.

In other words, the number of slots for each pole image is set to one.

The stator winding group 161 of one phase is comprised from the 1st-4th windings 31-34.

The first winding 31 winds the wire 30 in a waveform so as to alternately adopt addresses 1 and 2 in the slot 15a for every 3 slots (1 stimulus pitch) from slots 1 to 34. Consists of.

The second winding 32 is formed by winding the wire 30 in a waveform so as to alternately adopt addresses 2 and 1 in the slot 15a every 3 slots from slot numbers 1 to 34.

Further, the third winding 33 is configured by winding the wire 30 in a waveform so as to alternately adopt addresses 3 and 4 in the slot 15a every 3 slots from slot numbers 1 to 34.

Further, the fourth winding 34 is configured by winding the wire 30 in a waveform so as to alternately adopt addresses 4 and 3 in the slot 15a every 3 slots from slot numbers 1 to 34.

In each slot 15a, four wires 30 are arranged in a row in the radial direction.

In the front side of the stator core 15, the end 31a of the first winding 31 extending from the slot number 1 and the end 33b of the third winding 33 extending from the slot number 34 are also shown. ) Is joined, and the end 33a of the third winding 33 extending from the slot number 1 and the end 31b of the first winding 31 extending from the slot number 34 are joined to form a two-turn waveform. A winding winding is formed.

On the other hand, on the rear side of the stator core 15, the end portion 32a of the second winding 32 extending from the slot number 1 and the end 34b of the fourth winding 34 extending from the slot number 34 are found. ) Is joined, and the end 34a of the fourth winding 34 extending from the slot number 1 and the end 32b of the second winding 32 extending from the slot number 34 are joined to form a two-turn waveform. A winding winding is formed.

Further, an end portion 34d of the fourth winding line 34 extending to the rear side at the slot number 22 and an end portion 33d of the third winding line 33 extending to the rear side at the slot number 25 are joined to each other. A stator winding group 161 for one phase of four turns formed by connecting the first to fourth windings 31 to 34 in series is formed.

The end 34c of the fourth winding extending to the rear side at the slot number 25 and the end 33c of the third winding extending at the rear side at the slot number 28 are drawn out of the stator winding group 161, respectively. It becomes line (0) and neutral point (N).

In the same way, the stator winding group 161 for three phases is formed by moving the slot 15a which the wire 30 recommends one by one.

Although the stator winding group 161 of three phases comprised in this way is abbreviate | omitted in the figure, it connects by AC connection, for example, in star shape, and comprises the stator winding 16 which consists of one three-phase alternating winding.

Specifically, as shown in FIG. 3, the stator windings 16 are short first and second conductor segments 40A and 40B formed by forming a substantially U-shaped cross-sectional spherical copper material coated with an insulating coating as a wire 30. Is configured using.

That is, the first and second conductor segments 40A and 40B are inserted one by one in the front side and the rear side in pairs of slots 15a every three slots.

At this time, the first conductor segment 40A is inserted into address 1 in the first slot 15a and address 2 in the second slot 15a spaced three slots away from the second slot 15a. The conductor segment 40B is inserted into address 3 in the first slot 15a and address 4 in the second slot 15a spaced three slots away from the first slot 15a.

In each of the slots 15a, the first and second conductor segments 40A and 40B are arranged in four layers in one row in the radial direction with the longitudinal direction of the spherical cross section coinciding in the radial direction.

The rear end of the first conductor segment 40A extending from the first slot 15a to the rear side 40a of the first conductor segment 40A and the second slot 15a spaced three slots away from the first slot 15a. The end portion 40a of the adjacent first conductor segment 40A extending to the side is joined to form a one-turn waveform winding winding corresponding to the first and second windings 31 and 32 in FIG. Doing.

In addition, the end portion 40a of the second conductor segment 40B extending from the first slot 15a toward the front side and the second slot 15a spaced three slots away from the first slot 15a are moved to the front side. An end portion 40a of the second adjacent conductor segment 40B that extends is joined to form a one-turn waveform winding winding corresponding to the third and fourth windings 33 and 34 in FIG. 2. .

Also, by the connection method shown in Fig. 2, the stator winding group for one phase formed by connecting the first and second conductor segments 40A and 40B and connecting four waveform winding windings of one turn in series ( 161 is configured.

In the stator winding 16 configured as described above, the joining portions 41 between the turn portions 40b of the first conductor segment 40A and the end portions 40a of the second conductor segment 40B are two in a row in the radial direction. They are arranged in layers, arranged in two rows and arranged in the circumferential direction so as to constitute the coil end group 16f on the front side.

Moreover, the turn part 40b of the 2nd conductor segment 40B and the junction part 41 between the edge parts 40a of the 1st conductor segment 40A are aligned in 2 layers by 1 row in the radial direction, and are arranged in 2 rows. They are arranged in the circumferential direction and constitute the rear coil end group 16r.

In the coil end groups 16f and 16r on the front side and the rear side, as shown in FIG. 4, the turn part 40b and the junction part 41 are arrange | positioned adjacent to the radial direction, and both axial heights are substantially equal. Doing.

According to the first embodiment, the coil end groups 16f and 16r of the stator winding 16 are arranged in two layers in a row in which the turn portions 40b and the joining portions 41 are adjacent in the radial direction and become two rows in the circumferential direction. It is arranged in an orderly manner. And the joint part 41 in which the insulating film is lost by welding is arrange | positioned adjacent to the turn part 40b which has an insulating film in radial direction, ie, the joint parts 41 in which the insulating film is lost are adjacent in the radial direction. It is not arrange | positioned, the short circuit accident in the coil end groups 16f and 16r resulting from the junction part 41 is prevented, and the stator 8 which has the outstanding insulation is obtained.

Therefore, in the vehicle alternator equipped with the stator 8, occurrence of a short circuit accident in the coil end groups 16f and 16r due to vibration can be suppressed and reliability can be improved.

Embodiment 2.

In the first embodiment, the coil end groups 16f and 16r of the stator winding 16 align the turn portions 40b and the joint portions 41 in two layers in a row in the radial direction, and are arranged in two rows so as to be circumferential in the circumferential direction. Although the arrangement | positioning and the axial height of the turn part 40b and the junction part 41 are comprised substantially the same, in this Embodiment 2, as shown in FIG. 5, the coil end group of 16 A of stator windings ( 16f and 16r arrange the turn portion 40b and the junction portion 41 in two rows in the radial direction, and are arranged in two rows in the circumferential direction, and the axial height of the junction portion 41 is turned in the turn portion 40b. It is to be made higher than the axial height of

Therefore, according to the second embodiment, in the coil end groups 16f and 16r of the stator winding 16A of the stator 8A, the axial height of the junction part 41 is higher than the axial height of the turn part 40b. As a result, the welding workability is improved, and at the same time, the joining portion 41 in which the insulating film is lost by welding is separated from the turn portion 40b, and a short circuit accident caused by the joining portion 41 is prevented and excellent insulation is obtained. .

In addition, when the stator 8A is mounted on a vehicular alternator, the risk of shorting the joint portions 41 due to vibration can be reduced, and the reliability can be improved. Moreover, in the coil end group 16r, since the axial height of the turn part 40b located in outermost diameter position is formed low, the gap between the coil end group 16r and the bracket 2 is ensured, and both Short circuits are blocked.

Embodiment 3.

Fig. 6 is a schematic perspective view showing a conductor segment constituting a stator winding in a fault of a vehicular AC generator according to Embodiment 3 of the present invention. Fig. 7 is a stator of a vehicular AC generator according to Embodiment 3 of the present invention. A schematic diagram showing a coil end group of.

In the third embodiment, as shown in Fig. 6, short first, second and third conductor segments 40A, 40B, and 40C formed by forming a substantially U-shaped cross-section spherical copper material coated with an insulating coating as a wire. Is configured using. That is, the first, second and third conductor segments 40A, 40B, and 40C are alternately inserted at the front side and the rear side, one in each pair of slots 15a, every three slots. At this time, the first conductor segment 40A is inserted into address 1 in the first slot 15a and address 2 in the second slot 15a spaced three slots away from the first slot 15a. Conductor segment 40B is inserted at address 3 in the first slot 15a and at number 4 in the second slot 15a three slots away from the first slot 15a, and the third conductor segment 40C. ) Is inserted into address 5 in the first slot 15a and address 6 in the second slot 15a three slots away from the first slot 15a. In each of the slots 15a, the first, second and third conductor segments 40A, 40B and 40C are arranged in six layers arranged in one row in the radial direction to match the longitudinal direction of the spherical cross section in the radial direction. It is.

The rear end of the first conductor segment 40A extending from the first slot 15a to the rear side 40a of the first conductor segment 40A and the second slot 15a spaced three slots away from the first slot 15a. The end portion 40a of the adjacent first conductor segment 40A extending to the side is joined to form a one-turn waveform winding winding corresponding to the first and second windings 31 and 32 in FIG. Doing.

The front side of the second end segment 40B of the second conductor segment 40B extending from the first slot 15qa to the front side and the second slot 15a spaced three slots away from the first slot 15a. End portions 40a of adjacent second conductor segments 40B extending to each other are joined to form a one-turn corrugated winding winding corresponding to the third and fourth windings 33 and 34 in FIG. have.

In addition, the rear side of the end portion 40a of the second conductor segment 40C extending from the first slot 15a toward the rear side and the second slot 15a spaced three slots away from the first slot 15a. The end part 40a of the adjacent 3rd conductor segment 40C extended to the junction is joined, and each constitutes a 1-turn waveform winding winding.

The first, second, and third conductor segments 40A, 40B, and 40C are joined together to form a stator winding group for six turns, each of which is formed by connecting six waveform winding windings of one turn in series. .

In the same manner, the stator winding group for three phases is formed by changing the slots 15a into which the first, second and third conductor segments 40A, 40B and 40C are inserted one by one.

Then, the stator winding group for three phases is connected in a star shape, for example, to obtain a stator winding 16B consisting of one three-phase alternating winding.

In the stator winding 16B of the stator 8B configured as described above, the turn portion 40b of the first conductor segment 40A, the junction portion 41 between the turn portions 40a of the second conductor segment 40B, The turn portions 40b of the third conductor segment 40C are arranged in three layers in one row in the radial direction, and are arranged in three rows, and are arranged in the circumferential direction and form the coil end group 16f on the front side. Moreover, the junction part 41 between the edge parts 40a of the 1st conductor segment 40A, the turn part 40b of the 2nd conductor segment 40B, and the edge part 40a of the 3rd conductor segment 40C are shown. ) The joint portions 41 are arranged in three layers in a row in the radial direction, and are arranged in three rows in a circumferential direction so as to constitute the rear coil end group 16r.

In addition, in the coil end group 16f on the front side, as shown in FIG. 7, the turn part 40b, the junction part 41, and the turn part 40b are arrange | positioned in three layers adjacent to the radial direction, and the axis of the junction part 41 is carried out. The direction height is higher than the axial height of the turn part 40b. On the other hand, in the rear coil end group 16r, as shown in FIG. 7, the junction part 41, the turn part 40b, and the junction part 41 are arrange | positioned in three layers adjacent to the radial direction, and the axis of the junction part 41 is carried out. The direction height is higher than the axial height of the turn part 40b.

Therefore, according to the third embodiment, as in the second embodiment, since the axial height of the joining portion 41 is configured to be higher than the axial height of the turn portions 40b adjacent in the radial direction, the welding workability is improved and The joint 41, in which the insulating film is lost by welding, is separated from the turn 40b, and a short circuit accident caused by the joint 41 is prevented and excellent insulation is obtained.

In addition, since the axial height of the junction part 41 is higher than the axial height of the turn part 40b which adjoins in the radial direction, even if the junction part 41 and the turn part 40b are arranged in multiple layers in the radial direction, weldability and There is no deterioration in insulation, and the structure is suitable for multilayering the coil ends.

Moreover, in the coil end group 16f, since the axial height of the turn part 40b located in outermost diameter position is formed low, the gap between the coil end group 16f and the bracket 1 is ensured, and both short circuits are performed. This is stopped.

Embodiment 4.

In the fourth embodiment, as shown in FIG. 8, for example, an insulating resin 42 such as an epoxy resin covers the junction 41, and is adjacent to the junction 41 and the junction 41 in the radial direction. It is arrange | positioned so that it may be over the turn part 40b. In addition, the other structure is comprised similarly to the said 3rd Embodiment.

In the stator winding 16C of the stator 8C of the fourth embodiment of the present embodiment, the insulating portion 42 is covered with the bonding portion 41, so that the insulating portion is not exposed by the welding. Insulation is further improved. Moreover, the joining part 41 is reinforced by the insulating resin 42, and generation | occurrence | production of the welding fall off resulting from a vibration is suppressed. Therefore, when the stator 8C is mounted on the vehicle alternator, the shock resistance is further improved, and excellent reliability is obtained.

Moreover, since the junction part 41 and the turn part 40b are thermally connected by the insulating resin, when the heat which generate | occur | produced in each winding which comprises the stator winding 16C is non-uniform, the heat of the winding of a high temperature side is a junction part, for example. At 41, it is transmitted to the turn part 40b through the insulating resin 42, and the temperature distribution of the coil end groups 16f and 16r is equalized. As a result, a high output of the vehicle alternator can be achieved.

In addition, since the insulating resin 42 is not provided so as to cover the entire coil end groups 16f and 16r, the coil end group 16f by the cooling fan 5 when the stator 8C is mounted on the vehicle alternator. It does not impair cooling property of (16r).

Moreover, since the junction part 41 located in the outermost position of the coil end group 16r is covered by the insulating resin 42, when attaching the stator 8C to a vehicle alternator, it is a grounding. Even when the brackets 1 and 2 and the coil end groups 16f and 16r come into contact with each other, the occurrence of corrosion of the joint 41 due to the leakage current is prevented.

Moreover, in the coil end group 16f, since the axial height of the turn part 40b located in outermost diameter position is formed low, the gap between the coil end group 16r and the bracket 2 is ensured, and both short circuits are performed. It is stopped.

Embodiment 5.

In the fourth embodiment, insulating resins 42 such as epoxy resins are provided to cover the joints 41. In the fifth embodiment, the varnish is applied to the entire coil end group 16f, 16r. I assume that there is.

According to the fifth embodiment, the joining portion 41 in which the insulating film is lost by welding is covered with the varnish, so that the insulation is improved.

In addition, the varnish is joined between the turn portion 40b of the first conductor segment 40A adjacent to the radial direction, the junction portion 41 between the end portions 40b of the second conductor segment 40B, and the third conductor segment 40C. Since it is filled between the turn portions 40b, the winding heat on the high temperature side is transmitted to the winding on the low temperature side through the varnish, so that the temperature distribution of the coil end groups 1rf and 16r is uniform.

Moreover, the junction part 41 of the turn part 40b of the 1st conductor segment 40A, the edge part 40a of the 2nd conductor segment 40B, and the turn part 40b of the 3rd conductor segment 40C are shown. Since the circumferential gap is secured, when the stator is mounted on the vehicle alternator, the cooling performance of the coil end groups 16f and 16r by the cooling fan 5 is not impaired.

Embodiment 6.

In the sixth embodiment, as shown in FIG. 9, in the stator winding 16D of the stator 8D, the turn portion 40b of the first conductor segment 40A and the end portion 40a of the second conductor segment 40B. ) The joints 41 and the turn portions 40b of the third conductor segment 40C are arranged in three layers in a row in the radial direction, are arranged in three rows in a circumferential direction, and are coil end groups on the front side. It constitutes 16f. Moreover, the junction part 41 between the edge parts 40a of the 1st conductor segment 40A, the turn part 40b of the 2nd conductor segment 40B, and the edge part 40a of the 3rd conductor segment 40C are shown. ), The joint part 41 of each other is arrange | positioned in three layers by one row in the radial direction, and is arranged in three rows squarely in the circumferential direction, and comprises the coil end group 16r of the rear side.

In the coil end group 16f on the front side, as shown in Fig. 9, the turn portion 40b, the junction portion 41, and the turn portion 40b are arranged in three layers adjacent in the radial direction, and the shaft of the junction portion 41 is formed. The direction height is higher than the axial height of the turn part 40b. On the other hand, in the coil end group 16r on the rear side, as shown in FIG. 9, the junction part 41, the turn part 40b, and the junction part 41 are arrange | positioned in three layers adjacent to the radial direction, and the shaft of the turn part 40b is carried out. The direction height is higher than the axial height of the junction part 41.

Therefore, according to the sixth embodiment, in the coil end group 16f as in the third embodiment, the axial height of the joining portion 41 is configured to be higher than the axial height of the adjacent turn portions 40b in the radial direction. In addition, the welding workability is improved, and at the same time, the joining portion 41 in which the insulating film is lost by welding is separated from the turn portion 40b, whereby a short circuit accident caused by the joining portion 41 is prevented and excellent insulation is obtained. Moreover, in the coil end group 16r, since the axial height of the turn part 40b is comprised higher than the axial height of the junction part 41 adjacent in the radial direction, welding workability improves and an insulation film is lost by welding. The junction part 41 which exists is separated from the turn part 40b, the short circuit accident resulting from the junction part 41 is prevented, and the outstanding insulation is obtained.

In addition, the stator 8D is formed so that the axial heights of the turn portions 40b and the joining portions 41 positioned at the outermost in the radial direction are lower than the axial heights of the joining portions 41 and the turn portions 40b adjacent in the radial direction. .

Therefore, when the stator 8D is attached to the vehicle alternator, interference between the brackets 1 and 2 and the turn part 40b and the junction part 41 located at the outermost side in the radial direction is suppressed. In other words, the brackets 1 and 2 are die-formed, so that a draft is required, and the inner diameter of the opening side of the brackets 1 and 2 is gradually reduced in the depth direction. Therefore, when the axial height of the outermost radial direction of the coil end groups 16f and 16r is high, interference between the inner wall surfaces of the brackets 1 and 2 and the coil end groups 16f and 16r occurs, but the coil ends By lowering the axial height at the radially outermost side of the groups 16f and 16r, interference with the brackets 1 and 2 can be suppressed. As a result, a gap between the brackets 1 and 2 and the coil end groups 16f and 16r is secured, whereby corrosion of the joint 41 due to leakage current is prevented and at the same time the brackets 1 and 2 caused by vibration. The short circuit between the inner wall surface of the c) and the coil end groups 16f and 16r is also suppressed.

Embodiment 7.

In the first to sixth embodiments, the stator winding is constituted by the waveform winding winding. In the seventh embodiment, the stator winding is configured by the lap-wound winding and the waveform winding winding.

Fig. 10 is a schematic perspective view showing a conductor segment constituting a fault winding in a stator of a vehicular ac generator according to a seventh embodiment of the present invention; Fig. 11 is a stator of a vehicular alternator according to a seventh embodiment of the present invention. A schematic diagram showing a coil end group of.

In the seventh embodiment, as shown in Fig. 10, short first, second and third conductor segments 45A, 45B and 45C formed of substantially U-shaped cross-section spherical copper material coated with an insulating coating as wires are formed. Is configured using. That is, the first and second conductor segments 45A and 45B are inserted at the front side in pairs of slots 15a every three slots, and the second conductor segment 45C is paired in slots 15a every three slots. Is inserted from the rear side. At this time, the first conductor segment 45A is inserted into address 1 in the first slot 15a and address 4 in the second slot 15a spaced three slots away from the first slot 15a. Conductor segment 45B is inserted into address 2 in the first slot 15a and address 3 in the second slot 15a, which is three slots away from the first slot 15a, and the third conductor segment ( 45C is inserted at address 5 in the first slot 15a and at address 6 in the second slot 15a three slots away from the first slot 15a. In each of the slots 15a, the first, second and third conductor segments 45A, 45B and 45C are aligned in six layers in one row in the radial direction with the longitudinal direction of the spherical cross section coinciding in the radial direction. Are arranged.

Then, the end 45a of the second conductor segment 45B extending from the second side of the first slot 15a to the rear side and the second slot 15a spaced three slots away from the first slot 15a. The end portion 45a of the first conductor segment 45A extending from the first address to the rear side is joined, and the first conductor segment 45A extending to the rear side from the fourth address of the first slot 15a. Is joined to the end 45a of the second conductor segment 45B extending from the third side of the second slot 15a, which is three slots away from the first slot 15a, to the rear side. This results in four turns of winding winding.

In addition, an end portion 45a of the third conductor segment 40C extending toward the front side from the fifth slot of the first slot 15a and a second slot 15a separated by three slots from the first slot 15a are provided. The end portions 45a of the adjacent third conductor segments 45C extending to the front side at the sixth side are joined to each other to form two corrugated winding windings of one turn.

In addition, the sixth turn formed by connecting the first, second, and third conductor segments 45A, 45B, and 45C in series and connecting one four-turn overlap winding winding and two one-turn waveform winding windings in series A stator winding group of one phase is formed.

Similarly, the slots 15a into which the first, second, and third conductor segments 45A, 45B, and 45C are inserted are moved one by one to form a stator winding group for three phases.

Then, the stator windings for the three phases are connected in a star shape, for example, to obtain a stator winding 16E composed of one three-phase alternating winding.

In the stator winding 16E of the stator 8E configured as described above, the turn portion 45a of the first conductor segment 45A and the turn portion 45b of the second conductor segment 45B, which have two layers in the axial direction, The joining portions 41 between the end portions 45a of the third conductor segment 45C are aligned in a row in the radial direction, and are arranged in the circumferential direction, so as to constitute the front end coil end group 16f. Moreover, the junction part 41 of the edge part 45a of the 1st conductor segment 45A, the edge part 45a of the 2nd conductor segment 45B, and the turn part 45b of the 3rd conductor segment 45C are shown. Are arranged in three layers in one row in the radial direction, and are arranged in three rows in the circumferential direction, constituting the coil end group 16r on the rear side.

In addition, in the coil end group 16f on the front side, as shown in FIG. 11, the turn part 45b and the junction part 41 which consist of two layers in an axial direction are arrange | positioned adjacently in the radial direction, and the junction part 41 and the outer layer side are shown. The height in the axial direction of the turn part 45b is approximately the same. On the other hand, in the coil end group 16r on the rear side, as shown in Fig. 11, the two joining portions 41 and the turn portions 45b are arranged in three layers adjacent to each other in the radial direction, and the turn portions 45b and the joining portions 41 are separated. The axial heights approximately coincide.

Therefore, according to the seventh embodiment, in the coil end group 16f on the front side, the joint part 41 whose insulation film is lost by welding is adjacent to the turn part 45b in the radial direction, which is caused by the joint part 41. Short circuit accidents are prevented.

Embodiment 8.

In the eighth embodiment, as shown in Fig. 12, in the coil end group 16f on the front side, the junction part 41 is formed higher than the axial height of the turn part 45b on the outer layer side, and the rear coil end group ( In 16r), the axial height of the junction part 41 in the radial direction outer side is formed higher than the axial height of the turn part 45b and the junction part 41 in the radial direction inner side. In addition, the other structure is comprised similarly to the said 7th Embodiment.

Therefore, in the coil end group 16f of the front side of the stator winding 16F of the stator 8F comprised as mentioned above, the axial height of the junction part 41 is higher than the axial height of the turn part 45b adjacent in the radial direction. Since the welding workability is improved, the joining portion 41 in which the insulating film is lost by welding is separated from the turn portion 45b, and a short circuit accident caused by the joining portion is prevented and excellent insulation is obtained.

Moreover, in the rear coil end group 16r, since the axial height of the junction part 41 is comprised higher than the axial height of the turn part 45b and the junction part 41 which adjoin the radial direction, welding workability improves. At the same time, the junction part 41 in which the insulating film is lost by welding is separated from the turn part 45b and the junction part 41, and the short circuit accident resulting from the junction part 41 is prevented and excellent insulation is obtained.

Moreover, in the coil end group 16r, since the axial height of the turn part 45b located in the outermost diameter position is formed low, the gap between the coil end group 16r and the bracket 2 is ensured, and both short circuits are prevented. do.

Embodiment 9.

In each of the above embodiments, a conductor segment molded in a substantially U shape is used as the wire. In the ninth embodiment, a continuous line is used as the wire. In the ninth embodiment, the number of poles of the rotor 7 is 16, and the number of slots of the stator core 15 is 96. That is, the number of slots corresponding to the polar medium is set to two.

It is a perspective view which shows the stator of the vehicular alternator which concerns on Embodiment 9 of this invention.

In Fig. 13, in the stator 8G, a wire 46 made of a co-continuous line having a spherical cross section coated with an insulating coating alternately addresses 1 and 2 to each pair of slots 15a apart from 6 slots (one magnetic pole pitch). It is recommended as a waveform to be adopted, and the ends are joined by welding to constitute one turn of the first waveform winding winding. In addition, it is recommended to use a waveform so that the wire 46 alternately adopts address 2 and address 1 to each pair of slots 15a separated by 6 slots, and ends are joined by welding to form a second turn winding winding of one turn. It consists. In addition, it is recommended to use a waveform so that the wire 46 alternately adopts three and four addresses to each pair of slots 15a separated by six slots, and the ends are joined by welding to form a third turn winding winding of one turn. It consists. In addition, the wire 46 is recommended as a waveform so as to alternately adopt the four and three addresses to each pair of slots 15a separated by six slots, and the ends are joined by welding to form a fourth turn winding winding of one turn. It consists.

Thus recommended first to fourth waveform winding windings are connected in series to form a stator winding of four turns per phase.

Similarly, the stator winding group for 6 phases is comprised by moving the slot 15a in which the wire 46 is inserted one by one.

The stator winding group of three phases is connected in a star shape, for example, and the stator winding 16G which consists of two three-phase alternating windings is comprised. In addition, two three-phase alternating windings are respectively connected to the rectifier 12, and the DC output of each rectifier 12 is connected in parallel, and is comprised so that it may be synthesize | combined.

In the present embodiment, the second waveform winding winding is recommended by inverting 180 degrees with respect to the first waveform winding winding, and the fourth waveform winding winding is recommended by inverting 180 degrees with respect to the third waveform winding winding.

Then, the wire 46 extends from address 1 of the first slot 15a on the cross-sectional side of the fault magnetic core 15 and is returned outside the slot to enter address 2 of the second slot 15a spaced 6 slots apart. The turn portions 46a are arranged in one row in the circumferential direction to form a coil end group on the inner circumferential side. The turn portion of the wire 46 extending from the third address of the first slot 15a on the cross-sectional side of the stator core 15 and returning out of the slot to the fourth address of the second slot 15a spaced six slots apart. 46a are arranged in one row in the circumferential direction to form a coil end group on the outer circumferential side.

In the stator 8G, the turn portions 46a are arranged in two layers in one row adjacent to each other in the radial direction, and are arranged in two rows in the circumferential direction to form the coil end groups 16f and 16r. Moreover, in the junction part 41 between the edge parts of the wire 46 which comprises the 1st-4th wave winding winding, as shown to FIG. 13 and FIG. 14, the junction part 41 and the turn part 46a adjoin in radial direction, They are arranged in two rows in one row, arranged in two rows, and arranged in the circumferential direction. And the axial height of the junction part 41 becomes higher than the axial height of the turn part 46a.

Therefore, also in the ninth embodiment, since the junction part 41 whose insulation film is lost by welding is adjacent to the turn part 46a having the insulation film in the radial direction, a short circuit accident attributable to the junction part is prevented and excellent insulation is obtained. Lose.

Moreover, since the axial height of the junction part 41 is formed higher than the axial height of the turn part 46a adjacent to the radial direction, welding workability improves and the junction part 41 falls from the turn part 46a, and the junction part Short circuit accidents caused by (41) are prevented and excellent insulation is obtained.

In addition, since the stator winding group of each phase of the stator winding 16G is composed of one wire 46, the joining point is significantly reduced compared to the case where a U-shaped conductor segment is used as the wire, and the welding workability is remarkable. At the same time, defects such as short-circuit accidents caused by the joints and dropping of welds at the welds are reduced.

In addition, although each said embodiment uses the copper material which has a spherical cross section for a wire, the wire is not limited to the copper material which has a spherical cross section, For example, even if it uses the copper material which has a circular cross section, do. In this case, the moldability of the wire is improved, and the arrangement and connection of the wire are facilitated, thereby improving workability.

Although copper material is used for a wire, a wire is not limited to a copper material, For example, an aluminum material may be sufficient as it.

In the above embodiment, the present invention is described as being applied to a stator of an on-vehicle alternator. However, the present invention can also be applied to other alternators and electric motors.

Since this invention is comprised as mentioned above, the effect described next is exhibited.

According to the present invention, in the stator of a rotary electric machine having a stator winding formed by joining a plurality of stator cores provided with a plurality of slots in a circumferential direction and a plurality of wires mounted in the slots on a predetermined slot on a cross section of the stator cores. The coil end group of the winding is composed of a joint part connecting the wires to each other on the cross section of the stator core, and a turn part of the wire extending from one slot away from the predetermined slot on the cross section of the stator core and entering the other slot, In at least one of the coil end groups, the joining portion is disposed adjacent to the turn portion in the radial direction, whereby deterioration in insulation caused by the joining portion is suppressed, and a stator of a rotating electric machine having excellent insulation is obtained.

The stator winding in a stator winding having a stator winding formed by joining a plurality of stator cores provided with a plurality of slots in the circumferential direction and a plurality of wires mounted in the slot on a cross section of the stator core for each predetermined number of slots. The coil end group of is composed of a joining portion for alternately connecting the wire on the cross section of the stator core, and the turn portion of the wire extending from one slot away from the predetermined slot on the cross section of the stator core and enters the other slot, The joining portion is disposed adjacent to the turn portion or the other joining portion with respect to the radial direction, and the axial height of the turn portion or the other joining portion, which is adjacent to the joining portion and the joining portion in the radial direction, is different from each other, resulting in insulation resulting from the joining portion. Deterioration of the substrate is suppressed and has excellent insulating properties Stator of a rotary electric machine with improved workability is obtained.

In addition, since at least one of the joining portions or the joining portions and the turn portions are arranged in three rows or more in the radial direction at least one of the coil end groups of the stator windings, a stator having a multilayer coil end structure is obtained.

Further, in at least one of the coil end groups of the stator windings, the turn portions are arranged on the inner diameter side and the outer diameter side in the radial direction adjacent to the junction portion, and are arranged in three layers in a row in the radial direction, and the axial height of the junction portion is increased. Since it is formed higher than the axial height of the said turn part, welding workability improves and the deterioration of the insulation resulting from a junction part is suppressed.

Moreover, since insulating resin is arrange | positioned so that the said junction part may be covered, deterioration of the insulation resulting from a junction part is suppressed, and generation | occurrence | production of the welding fall of a junction part is suppressed.

Moreover, since the said insulating resin is arrange | positioned between the said junction part adjacent in the radial direction, and between the said junction part and the said turn part, the temperature distribution of a coil end group becomes uniform.

In addition, since the varnish is applied to the coil end group, the joining portion is covered with the varnish and the deterioration of insulation resulting from the joining portion is suppressed.

Moreover, since the said turn part is located in the outermost diameter position with respect to the radial direction in at least one of the said coil end groups, the corrosion of the junction part resulting from the leakage current by the short circuit of a junction part and a bracket at the time of mounting to a rotating electric machine is suppressed. do.

Moreover, since the said junction part located in the outermost diameter position with respect to the radial direction is comprised low in the axial direction with respect to the said junction part or the turn part adjacent to the radial direction, the junction part and bracket of the outermost diameter position when mounted in a rotating electric machine. Short circuit with is suppressed.

Claims (3)

In the stator of a rotary electric machine having a stator core provided with a plurality of slots in a circumferential direction and a stator winding formed by joining a plurality of wires mounted in the slot for each predetermined number of slots on a cross section of the stator core, The coil end group of the stator windings comprises a joining portion for connecting the wires to each other on the cross section of the stator core, and a turn portion of the wire extending from one slot away from a predetermined slot on the cross section of the stator core and entering the other slot. And the joining portion is disposed adjacent to the turn portion with respect to the radial direction at least on one side of the coil end group. In the stator of a rotary electric machine having a stator core provided with a plurality of slots in a circumferential direction and a stator winding formed by joining a plurality of wires mounted in the slot for each predetermined number of slots on a cross section of the stator core, The coil end group of the stator windings comprises a joining portion for connecting the wires to each other on the cross section of the stator core, and a turn portion of the wire extending from one slot away from a predetermined slot on the cross section of the stator core and entering the other slot. And the joining portion is disposed adjacent to the turn portion or the other joining portion with respect to the radial direction, and the axial height of the joining portion and the axial height of the joining portion or the other joining portion radially adjacent to the joining portion are different from each other. Stator of rotary electric machine. The method according to claim 1 or 2, A stator of a rotating electric machine, wherein at least one of the coil end groups of the stator windings has three or more layers of the junction portion, or the junction portion and the turn portion arranged in one row in the radial direction.