WO2015071971A1

WO2015071971A1 - Rotary electric machine

Info

Publication number: WO2015071971A1
Application number: PCT/JP2013/080659
Authority: WO
Inventors: 夏樹渡辺; 貞一郎千葉; 杉本　幸彦
Original assignee: 株式会社小松製作所
Priority date: 2013-11-13
Filing date: 2013-11-13
Publication date: 2015-05-21

Abstract

A rotary electric machine (10) provided with an annular stator (15), and a rotor (14) rotatably disposed on the inner peripheral side of the stator (15), wherein a plurality of teeth (42) projecting toward the rotor (14) side are circumferentially provided at regular intervals in the stator (15), a coil (43) around which an element wire is wound is inserted into the tooth (42), the coil (43) is dividable into a first coil part (51) on the base end side of the tooth and a second coil part (52) on the leading end side thereof, and the first and second coil parts (51, 52) are coupled to each other by a coupling part (53) formed by part of the element wire.

Description

Rotating electric machine

The present invention relates to a rotating electrical machine, and more particularly, to an improvement in a stator coil structure used in a rotating electrical machine such as an electric motor or a generator, particularly a stator coil structure having a coil formed by concentrated winding.

An electric motor having a plurality of coils formed by concentrated winding is widely used. In such a stator of an electric motor, slots are formed by gaps between a plurality of teeth. In order to reduce the copper loss in the stator and improve the efficiency of the electric motor, it is effective to increase the coil space factor in the slot. As an electric motor with improved space factor, it has been proposed to alternately arrange rectangular coils and pyramid coils each having the same cross-sectional area on teeth arranged in parallel in the circumferential direction (for example, Patent Document 1).

Since each tooth protrudes from the inner peripheral portion of the stator core toward the center, the gap in the slot becomes narrower toward the inner side of the slot and expands toward the outer side. According to Patent Document 1, half of such a slot is occupied by a rectangular coil and the other half is occupied by a pyramid coil. However, the rectangular coil can be brought close to the inclined portion of the pyramid coil, Also, the rectangular coil and the pyramid coil are closely arranged on the inner side of the formed slot without interference, and the space factor of the coil in the slot is improved.

JP 2002-112484 A

However, in Patent Document 1, it is necessary to separately prepare two types of coils having different shapes such as a rectangular coil and a pyramid coil, which causes a problem that handling of the coil at the time of assembly becomes complicated.

An object of the present invention is to provide a rotating electrical machine having a coil structure of a stator that can improve the space factor of a coil in a slot and can eliminate complexity during assembly.

The rotating electrical machine of the present invention is a rotating electrical machine that includes an annular stator and a rotor that is rotatably disposed on the inner peripheral side of the stator. The stator includes a plurality of teeth that protrude toward the rotor side. A coil around which a wire is wound is inserted in the teeth at equal intervals, and the coil includes a first coil portion on the proximal end side of the teeth and a second coil portion on the distal end side. And the first and second coil portions are connected to each other by a connecting portion formed by a part of the element wire.

According to the present invention, when the first coil portion is inserted into the predetermined tooth, it is not necessary to insert the second coil portion into another tooth adjacent to the first coil portion. For this reason, even if the slot between the teeth is narrow, the first coil portion does not interfere with the second coil portion, and the first coil portion having a large outer diameter can be reliably inserted, and the base end side ( The space factor on the outward side can be improved. In addition, the space factor on the front end side (inward side) of the slot can be increased by increasing the outer diameter so that the second coil portion inserted on the tip side of the teeth does not interfere with the adjacent second coil portion. Can be improved. And as a coil, it is only necessary to prepare one type having a first coil part and a second coil part that can be divided, and the troublesomeness caused by the increase in the number of types can be eliminated.

In the rotating electrical machine according to the aspect of the invention, it is preferable that the coil has a protruding portion formed by protruding along the rotation center axis of the rotor with respect to the portion where the connecting portion is wound.
According to the present invention, since the connecting portion protrudes as the protruding portion in the direction along the rotation center axis of the rotor, the connecting portion does not interfere between adjacent coils, and the coil fits well in the slot. it can.

In the rotating electrical machine of the present invention, a first insulator inserted into the proximal end side of the teeth and wound with the first coil portion, and a second insulator inserted into the distal end side and wound with the second coil portion. It is preferable that the first and second insulators are provided with fitting portions that are fitted to each other at adjacent ends of the first and second insulators.
According to the present invention, since the first and second insulators that are detachable from each other are used, the first coil part is wound around the first insulator in advance, and the second coil part is wound around the second insulator in advance. Thus, the first and second coil portions can be divided and integrated at the same time as the first and second insulators are engaged and disengaged.

In the rotating electrical machine of the present invention, it is preferable that the posture of the second coil portion with respect to the first coil portion is maintained by the shape retaining property of the connecting portion.
According to the present invention, when the first coil portion is first inserted into the proximal end side of the tooth, the second coil portion can be maintained in a posture facing the distal end of the tooth. Therefore, when the second coil portion is inserted, it is only necessary to push in the state of the posture, and the assembling work can be facilitated.

In the rotating electrical machine of the present invention, the strand is preferably a rectangular wire having a rectangular cross section. In such a case, it is difficult for voids to occur in the overlapping portion of the strands, and the space factor is easily improved. Since the contact area between the strands is large, the heat conduction can be improved and the heat dissipation performance from the coil surface can be improved.

The rotating electrical machine of the present invention is a rotating electrical machine that includes an annular stator and a rotor that is rotatably disposed on the inner peripheral side of the stator. The stator includes a plurality of teeth that protrude toward the rotor side. The first insulator is provided at equal intervals in the circumferential direction, and a coil around which a wire having a rectangular cross section is wound is inserted into the tooth, and the coil is inserted into the base end side of the tooth. The first coil portion wound around the first coil portion and the second coil portion wound around the second insulator inserted on the distal end side can be freely divided. And a connecting portion formed by a plurality of connecting portions, and the connecting portion has a protruding portion formed by protruding along the rotation center axis of the rotor with respect to another wound portion. And

The side view of the construction machine carrying the generator motor to which the coil structure concerning one embodiment of the present invention was applied. The top view which shows a part of said construction machine. The disassembled perspective view which shows the said generator motor. Sectional drawing which shows the said generator motor. The front view which shows the stator of the said generator motor. The schematic diagram which shows notionally the connection state of the coil used for the said stator. The enlarged view which shows the principal part of the said stator in partial cross section. The front view which shows the said coil in the state spaced apart to the 1st coil part and the 2nd coil part. The perspective view which shows the coil used for the said stator. The perspective view which shows the state which mounted | wore the teeth with the said coil. The 1st perspective view explaining the assembly procedure of the said coil. The 2nd perspective view explaining the assembly procedure of the said coil. The 3rd perspective view explaining the assembly procedure of the said coil. The perspective view which shows the modification of this invention.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a side view of a hydraulic excavator 1 equipped with a generator motor 10 as a rotating electrical machine to which the coil structure according to the present embodiment is applied. FIG. 2 is a plan view showing a part of the excavator 1.

[General configuration of hydraulic excavator]
The hydraulic excavator 1 is a so-called hybrid system in which the generator 6 is driven by the engine 6 to generate electric power, the upper swing body 3 is rotated by this electric power, and the auxiliary machines of the hydraulic excavator 1 are driven. Construction machine.
Such a hydraulic excavator 1 includes a lower traveling body 2 and an upper revolving body 3 provided on the lower traveling body 2 so as to be able to swivel. The upper swing body 3 includes a work machine 4, a cab 5, an engine 6, a hydraulic pump 7, an inverter 8, a capacitor 9, and a generator motor 10. The generator motor 10 and the inverter 8 are electrically connected via a power cable CA1, and the inverter 8 and the capacitor 9 are electrically connected.

Among these, the upper swing body 3 is driven by a swing electric motor 3A that is operated by electric energy from the generator motor 10 or the capacitor 9. The swing electric motor 3A and the inverter 8 are electrically connected via a power cable CA2. The swing electric motor 3 </ b> A generates power by the regenerative operation when the upper swing body 3 is decelerated, and the electric energy obtained by the power generation is stored in the capacitor 9 through the inverter 8.

Further, the outer race OL of the swing circle SC is fixed to the upper swing body 3, and the inner race IL of the swing circle SC is fixed to the lower travel body 2. With such a structure, the swing circle SC connects the upper swing body 3 and the lower traveling body 2. The input / output shaft of the swing electric motor 3A is connected to the swing pinion SP via a swing machinery having a speed reduction mechanism. The swing pinion SP meshes with internal teeth formed on the inner race IL of the swing circle SC.

The driving force of the swing electric motor 3A is transmitted to the swing pinion SP via the swing machinery, and the upper swing body 3 is swung. In the present embodiment, the swing electric motor 3A is installed so that the input / output shaft of the swing electric motor 3A is directed in the direction in which gravity acts when the swing electric motor 3A is installed vertically, that is, when the hybrid excavator 1 is installed on a horizontal plane.

The work machine 4 includes a boom 4A, an arm 4B, and a bucket 4C. The boom 4A, the arm 4B, and the bucket 4C are driven by hydraulic oil for the boom 4A, the arm 4B, and the bucket 4C, respectively, via the control valve by hydraulic oil pumped from the hydraulic pump 7 shown in FIG. Perform various operations such as excavation.

[Configuration of generator motor]
FIG. 3 is an exploded view of the generator motor 10 according to the present embodiment. FIG. 4 is a cross-sectional view of the generator motor 10. More specifically, FIG. 4 shows a cross section when the generator motor 10 is cut along a plane including the rotation center axis Z of the rotor 14 of the generator motor 10 and parallel to the rotation center axis Z.

The generator motor 10 has a rotor shaft 14A connected directly or indirectly to the output shaft of the engine 6 and the input shaft of the hydraulic pump 7, and generates power by the rotational driving force of the output shaft of the engine. . When increasing the rotation of the engine 6, the generator motor 10 is used as an electric motor by the electric energy stored in the capacitor 9 as needed to assist the rotation of the engine 6. When the engine 6 is in an idling state, the generator motor 10 receives the rotational driving force of the engine 6 to generate electric power, and the electric energy generated by the electric power generation is stored in the capacitor 9.

The generator motor 10 in the present embodiment is a generator motor having a three-phase switched reluctance (hereinafter abbreviated as SR: Switched Reluctance) motor structure, and includes a first housing 11 on the engine 7 side, a flywheel A wheel 12, a coupling 13, a rotor 14, a stator 15, a second housing 16 on the hydraulic pump 7 side, and a flange 17 are provided.

The first housing 11 is a cast iron member, and is joined to the second housing 16 to form a space for accommodating the rotor 14, the stator 15, and the like. In the lower part of the storage space, there is formed an oil reservoir 21 for storing the cooling oil for encouraging lubrication of the rotor shaft 14A and the bearing 18 and cooling the heat generating part (coil 43, etc.) of the stator 15. . The cooling structure of the stator 15 will be described later.

The flywheel 12 is fixed to the output shaft of the engine 6 in the accommodating space formed by the first and

second housings

11 and 16. The flywheel 12 is connected to the rotor 14 via the coupling 13 and rotates in the first and

second housings

11 and 16.

The coupling 13 is a substantially annular member and is bolted to the flywheel 12. In this coupling 13, an internal spline formed on the inner diameter portion meshes with an external spline formed on the outer diameter portion on the engine side of the rotor shaft 14A, and is splined to each other. As a result, the flywheel 12, the coupling 13, and the rotor 14 having the rotor shaft 14A rotate together and are driven by the engine 6.

The rotor 14 is disposed in a space on the inner peripheral side of the stator 15 in the first and

second housings

11 and 16. A support space 14B in which the rotor shaft 14A is bolted is formed in the center of the rotor 14. A cylindrical support portion 17A provided at the center of the flange 17 enters the support space 14B. The bearings 18 are disposed between the inner peripheral surface of the support space 14B and the outer peripheral surface of the support portion 17A, so that the rotor 14 is rotatably supported around the support portion 17A of the flange 17.

On the other hand, the portion on the hydraulic pump 7 side of the rotor shaft 14A of the rotor 14 is inserted into the support portion 17A of the flange 17. In the rotor shaft 14A of the rotor 14, an internal spline is formed on the inner diameter side of the portion inserted into the support portion 17A. The internal spline and the external spline provided on the input shaft of the hydraulic pump 7 are spline-coupled. As a result, the hydraulic pump 7 is driven by the engine 6 via the rotor 14.

The stator 15 is provided in a space in the first and

second housings

11 and 16, and the second housing 16 is provided with a plurality of bolts 22 (only one is shown in FIG. 3) penetrating the yoke 41 portion from the engine 6 side. Bolted to.

The second housing 16 is a cast iron member, and is provided on the hydraulic pump 7 side (the right side in FIG. 4) of the generator motor 10. The second housing 16, together with the first housing 11 that is bolt-fixed, forms a storage space for storing the flywheel 12, the coupling 13, the rotor 14, and the stator 15, and forms an outer shell of the generator motor 10.

The electric box 19 having an internal space communicating with the accommodation space is attached to the shoulder portion of the second housing 16. In the internal space of the electric box 19, terminals for connecting lead wires A1, A2, B1, B2, C1, and C2 (FIGS. 5 and 6) from the coil 43 are arranged. Such a terminal is connected to a connector of a power cable CA1 (FIG. 2) fixed to the electric box 19. That is, the electric energy generated by the generator motor 10 is transmitted from the electric box 19 to the inverter 8 through the power cable CA1.

The flange 17 is a member that closes the storage space formed by the first and

second housings

11 and 16 on the second housing 16 side. Therefore, the flange 17 is bolted to the second housing 16 from the hydraulic pump 7 side. An insertion hole 17B is provided coaxially with the support portion 17A at the center of the flange 17, and the input shaft of the hydraulic pump 7 inserted through the insertion hole 17B is splined with the rotor shaft 14A of the rotor 14 as described above. Is done.

[Generator / motor cooling structure]
In FIG. 4, the second housing 16 is provided with a cooling medium introduction path 31 through which a cooling medium such as oil is introduced toward the rotation center axis Z. The lower end of the cooling medium introduction path 31 is open to the flange 17 side at the contact surface between the second housing 16 and the flange 17. The flange 17 is provided with a vertical cooling medium communication path 32 whose upper end communicates with the lower end of the cooling medium introduction path 31 and whose lower end opens at the end of an internal spline formed in the rotor shaft 14A. Further, the flange 17 is provided with a cooling medium branch path 33 that branches in the horizontal direction from the middle of the cooling medium communication path 32 and opens above the support portion 17A. The support portion 17A is provided with a plurality of communication holes 17C communicating in the radial direction along the circumferential direction.

A part of the cooling medium supplied to the cooling medium introduction path 31 of the second housing 16 flows down through the cooling medium communication path 32 of the flange 17. Part of the coolant that has flowed down flows through the spline coupling portion between the flange 17 and the rotor shaft 14A to the space between the support portion 17A and the rotor shaft 14A. Further, the other part of the cooling medium flowing down from the cooling medium communication path 32 flows into the internal space of the rotor shaft 14A through the spline coupling portion between the rotor shaft 14A and the input shaft of the hydraulic pump 7 (FIG. 2).

The cooling medium that has flowed into the space between the support portion 17A and the rotor shaft 14A moves to the inner surface side of the support portion 17A by the centrifugal force when the rotor 14 rotates, and is supplied to the bearing 18 side through the communication hole 17C of the support portion 17A. The bearing 18 is cooled and lubricated. The cooling medium that has cooled the bearing 18 moves further outward by centrifugal force, and most of the cooling medium is collected by the first blade 34 having a J-shaped cross section provided on the outer periphery of the rotor 14. The cooling medium collected by the first blade 34 is discharged by a centrifugal force from a discharge hole 34A provided in the first blade 34 and supplied to a gap between the coil end of the coil 43 and the second housing 16. The coil end facing the second housing 16 side of 43 is efficiently cooled.

On the other hand, the cooling medium flowing into the internal space of the rotor shaft 14A flows out from the spline coupling portion between the rotor shaft 14A and the output shaft of the engine 6 (FIG. 2), and then the rotor shaft 14A and the coupling 13 It flows out to the outer peripheral side of the coupling 13 through the spline coupling portion. The coolant that has flowed out is moved outward by centrifugal force, and most of the coolant is collected by the second blade 35 provided on the outer periphery of the rotor 14. The cooling medium collected by the second blade 35 is discharged by a centrifugal force from a discharge hole 35A provided in the second blade 35, and efficiently cools the coil end of the coil 43 facing the first housing 11 side.

Meanwhile, of the cooling medium supplied to the cooling medium introduction path 31, the cooling medium that has flowed to the cooling medium branch path 33 side flows out above the support portion 17A. The cooling medium that has flowed out spreads around the support portion 17 </ b> A, moves outward by centrifugal force, and is collected by the first blade 34. As described above, the aggregated cooling medium is discharged from the discharge holes 34A by centrifugal force to cool the coil ends.

The cooling medium that has cooled the coil ends drops in the first and

second housings

11 and 16 and accumulates in the oil reservoir 21, and is shown in FIG. 3 via a discharge passage 22, a filter (not shown), and a pump. It is sent to the oil cooler inlet 23. The cooling medium cooled by the oil cooler is supplied again from the oil cooler outlet 24 through the pipe 25 to the upper part of the cooling medium introduction path 31.

[Structure of stator]
FIG. 5 is a front view showing the stator 15 of the generator motor 10. FIG. 6 is a schematic diagram conceptually showing the connection state of the coils used in the stator 15. FIG. 7 is an enlarged view showing a part of the main part of the stator 15 in cross section.

5 to 7, the stator 15 includes an annular stator core 40 and a plurality of coils 43. The stator core 40 is configured by laminating a plurality of electromagnetic steel plates. An outer peripheral side of the stator core 40 is an annular yoke 41. The yoke 41 is provided with a plurality of teeth 42 (FIG. 5) protruding radially inward at equal intervals along the circumferential direction. A coil 43 by concentrated winding is wound around each tooth 42. In the present embodiment, a total of 36 teeth 42 are provided on the stator core 40 in order to constitute the 36-pole stator 15. A space between adjacent teeth 42 is a slot 44.

In the three-phase AC generator / motor 10 composed of the A phase, the B phase, and the C phase, a total of six lead wires A1, A2, B1, B2, C1, and C2 where power is input and output are in a predetermined position. It is pulled out from the coil 43. One end of the wire of one coil 43A constituting the A phase is drawn out as a lead wire A1, and the other end is electrically connected to one end of the wire of the next coil 43A separated by two counterclockwise in FIG. Connected. The other end of the strand of the twelfth coil 43A is drawn out as a lead wire A2. The same applies to the plurality of B-phase coils 43B and the plurality of C-phase coils 43C.

Here, in FIG. 5, the coils 43 of the respective phases are drawn so that the strands of each phase are connected to each other, but actually, as schematically shown in FIG. Are electrically connected. That is, on the outer peripheral side of the bus bar 50, a plurality of A-phase conducting portions 50A to which the strands of the A-phase coil 43A are welded are formed in an arc shape. The A-phase conducting portion 50A has a length corresponding to the interval between the coils 43A. Similarly, a B-phase conduction portion 50B is formed inside the A-phase conduction portion 50A of the bus bar 50, and a C-phase conduction portion 50C is formed further inside the B-phase conduction portion 50B. Coils 43A, 43B, and 43C are connected in series for each phase by

conduction portions

50A, 50B, and 50C of the respective phases.

[Teeth and coils]
Based on FIG. 7, the teeth 42 and the coil 43 will be described in detail.
In FIG. 7, the teeth 42 have a staircase shape. Specifically, the teeth 42 have a wide end portion 45 on the base end side that is the outer side and a narrow width portion 46 on the front end side that is the inner side. The width dimension of the widened portion 45 along the circumferential direction of the stator 15 is larger than the similar width dimension of the narrow width portion 46, and the widened portion 45 and the narrow width portion 46 are continuous by a tapered stepped portion 47. The stepped portion 47 is located substantially at the center in the length direction of the teeth 42 (same as the protruding direction). By making the proximal end side of the teeth 42 thicker than the distal end side, magnetic saturation on the proximal end side can be suppressed, and the magnetic flux density can be reliably increased according to the strength of the magnetic field.

The coil 43 is formed by winding a strand made of a rectangular wire having a rectangular cross section. When a rectangular wire is used as the strand, compared to the case where a strand having a circular cross section (round wire) is used, voids are less likely to occur in the overlapping portion between the strands, and the space factor is easily improved. Further, since the contact area between the strands is large, the heat conduction is good and the heat dissipation performance from the surface of the coil 43 is excellent.

Such a strand is wound in a triple manner by the widened portion 45 of the tooth 42, and is wound in three stages in the longitudinal direction. In the narrow portion 46, the wire is wound in a triple and double step at a portion near the wide portion 45, and is wound in a double and double step on the tip side. Further, the wire is wound in a double and one step at the stepped portion 47. The numbers given to the cross-sectional portions of the strands in FIG. 7 are the order in which the strands are wound. The wire is wound so that the odd-numbered portion on the left side facing the paper surface is vertically downward with respect to the paper surface, and the even-numbered portion on the right side is vertically upward with respect to the paper surface.

Here, a first insulator 48 having an insulating property is inserted into the widened portion 45 of the tooth 42, and a second insulator 49 having an insulating property is inserted into the narrow-width portion 46. The first and

second insulators

48 and 49 have

fitting portions

48A and 49A on end sides close to each other, and are fitted by these

fitting portions

48A and 49A. Further, the above-described triple triple-stage wire portion is wound around the first insulator 48, and the above-described triple double-stage and double double-stage wire portions are wound around the second insulator 49. The above-described single and single-stage wire portions are wound at positions corresponding to the

fitting portions

48A and 49A.

Such first and

second insulators

48 and 49 can be engaged and disengaged together with the wound wire until the middle of the assembly process of the stator 15, and the coil 43 is connected to the outer first coil portion 51. It is possible to divide the inner coil into the second coil portion 52 on the inner side. At this time, the single-stage winding portion corresponding to the fitting portion is provided with the 7th and 30th portions on the first coil portion 51 side, and the 8th and 29th portions on the second coil portion 52 side. Provided. However, even in the divided state, the first and

second coil portions

51 and 52 are connected by the two connecting portions 53 formed of the strand portions. As the connection part 53 which connects each other, the part wound from No. 7 on the first coil part 51 side toward No. 8 on the second coil part 52 side, and No. 29 on the second coil part 52 side from the first coil part. It is a part wound toward No. 30 on the 51 side.

In forming such a coil 43, first and

second coil portions

51 and 52 are formed by winding a wire around first and

second insulators

48 and 49 which are integrated with each other. That is, the wire is wound around the first insulator 48 from No. 1 to No. 7 and then moved to the second insulator 49 with a length of the connecting portion 53 from here. Wind up to 29. Further, after a length of the connecting portion 53 from No. 29 of the second insulator 49, the transition to the first insulator 48 is performed again, and the No. 30 to No. 42 are wound around the first insulator 48. In the state after winding, the two connecting portions 53 intersect each other on the first housing 11 (FIG. 4) side with respect to the teeth 42. As a result, as shown in FIG. 9, a coil 43 in which the strands are wound around the first and second insulators 48 and 49 (not shown in FIG. 9) is completed. Then, the coil 43 is released in the axial direction (vertical direction in FIG. 8) by releasing the fitting of the first and

second insulators

48 and 49, as shown in FIG. 8. The first coil unit 51 and the second coil unit 52 are divided into a connected state.

The length of the connecting portion 53 is a length that allows the second coil portion 52 to be inserted into and removed from the narrow width portion 46 in a state where the first coil portion 51 is inserted into the widened portion 45 of the tooth 42.
When the coil 43 that is not divided into the adjacent teeth 42 is inserted into the predetermined tooth 42, the slot (inner side opening) of the slot 44 is small with respect to the predetermined tooth 42. Even if a new coil 43 is inserted, it interferes with the coil 43 of the adjacent tooth 42 and cannot be inserted.

However, for the second coil portion 52 of the separable coil 43, the triple winding portion is only provided in two stages, and the length of the thick portion is shorter than that of the first coil portion 51. Therefore, even if the opening of the slot 44 is small because the coil 43 that has not been divided is inserted next to the adjacent coil 43, the first coil portion 51 can be inserted in advance into the tooth 42 to be newly inserted. For example, the second coil portion 52 can be freely inserted into the first coil portion 51. As a result, in the slot 44, not only the adjacent first coil portions 51 but also the second coil portions 52 can be brought close to each other, and the space factor of the coil 43 in the slot 44 can be improved.

[Detailed description of coil]
FIG. 8 shows a front view in a state in which the coil 43 is separated from the first coil portion 51 and the second coil portion 52. FIG. 9 shows a perspective view of the coil 43. FIG. 10 is a perspective view of the coil 43 attached to the tooth 42. FIG. 8, 9, and 10, the first and

second insulators

48 and 49 are not shown.

8 to 10, in the coil 43 of the present embodiment wound in a rectangular shape in accordance with the cross-sectional shape of the tooth 42, the connecting portion 53 that connects the first and

second coil portions

51 and 52 has one short side. It is located on the side, and this position is directed to the first housing 11 side shown in FIGS. The length of the connecting portion 53 is longer than the width W1 (FIG. 9) of the short side of the portion that is triple-wound. For this reason, in the state in which the first and

second coil portions

51 and 52 are integrated as the coil 43, the connecting portion 53 cannot be accommodated within the short side width W1, and as shown in FIGS. It protrudes and protrudes to the housing 11 side. This protruding portion is a protruding portion 54 of the coil 43 and is formed by two connecting portions 53.

In addition, since the wire of the coil 43 of the present embodiment is thick, in the state where the coil 43 is divided into the first and

second coil parts

51 and 52, the first coil part 51 inserted in the teeth 42 is The posture of the second coil part 52 separated from this can be maintained by the shape retaining property of the connecting part 53. For this reason, in the state in which the first coil portion 51 is inserted into the widened portion 45 of the tooth 42, the second coil portion 52 is slightly separated from the tip of the tooth 42, and this posture is maintained. Then, when the second coil portion 52 is pushed in as it is, the second coil portion 52 is inserted into the narrow width portion 46 and is integrated with the first coil portion 51 again.

The division position of the first coil part 51 and the second coil part 52 is a position substantially corresponding to the center of the length direction of the teeth 42, that is, the stepped part 47. When dividing at a position that is extremely longer as the first coil portion 51 and shorter as the second coil portion 52, the outer dimensions of the first coil portion 51 are not reduced unless they are inserted into the teeth 42. There is a possibility of interference with other first coil sections 51, and the space factor does not increase as much as expected.

On the other hand, when dividing at a position where the first coil portion 51 is shorter and the second coil portion 52 is longer, the outer dimensions of the second coil portion 52 must be reduced before insertion into the teeth 42. There is a possibility of interference with the other second coil section 52, and the space factor does not increase as much as expected. Further, in this case, since the length of the connecting portion 53 is also longer, it is conceivable that the protruding amount of the protruding portion 54 is increased, and when accommodated in the first and

second housings

11 and 16, The possibility of interfering with other parts arises. In addition, since the size of the second coil portion 52 becomes large and heavy, it becomes difficult to maintain the posture through the connecting portion 53.

[Assembly procedure of stator]
The assembly procedure of the stator 15 having the coil 43 described above will be described with reference to FIGS. In the following description, it is assumed that the first coil portion 51 of each coil 43 is wound around the first insulator 48 and the second coil portion 52 is wound around the second insulator 49. The illustration and description of the first and

second insulators

48 and 49 are omitted.

First, as shown in FIG. 11, every other coil 43 in a state of being divided into a first coil portion 51 and a second coil portion 52 is disposed with respect to the teeth 42. That is, the first coil portion 51 is inserted into the widened portion 45 of every other tooth 42. At this time, the coils 43 are arranged so that the connecting portions 53 are all exposed in the same direction. Further, the second coil portion 52 is opposed to the tip of the tooth 42. The order in which the first coil portion 51 is inserted into any of the widened portions 45 is arbitrary.

Next, as shown in FIG. 12, the coils 43 that are not divided into the first coil part 51 and the second coil part 52 are inserted into every other vacant tooth 42. The insertion order at this time is also arbitrary. Here, the second coil portion 52 in the divided state is slightly movable while facing the tip of the tooth 42 as the connecting portion 53 bends. Therefore, when inserting the non-divided coils 43, the second coil portions 52 of the left and right coils 43 may be moved so as to expand left and right. Thereafter, as shown in FIG. 13, the second coil part 52 in the divided state is pushed in as it is from the tip position of the tooth 42 and integrated with the first coil part 51. The pushing order at this time is also arbitrary.
Further, the wire of each coil 43 is connected to the bus bar 50, the lead wires A1, A2, B1, B2, C1, and C2 are processed, the sensor parts are assembled, and finally, the varnish is processed and the stator 15 is fixed. Finalize.

[Modification]
It should be noted that the present invention is not limited to the above-described embodiments, and modifications, improvements, and the like within the scope that can achieve the object of the present invention are included in the present invention.
For example, in the above-described embodiment, the coil 43 is divided by pulling the second coil portion 52 away from the first coil portion 51 in the axial direction (center direction of the stator 15). As described above, the coil 43 may be divided by separating the second coil portion 52 from the first coil portion 51 so that the second coil portion 52 is bent by approximately 90 ° at the connecting portion 53. In such a divided structure, the length of the connecting portion 53 can be shortened as compared with the embodiment, and the protruding amount of the protruding portion 54 can be suppressed. And since the connecting portion 53 is bent by 90 °, when inserting the coil 43 that is not divided, it is not necessary to move the second coil portion 52 of the left and right coils 43 so as to expand left and right, Can be easily inserted as it is.

In the embodiment, the tooth 42 has a stepped shape having the widened portion 45, the narrowed portion 46, and the stepped portion 47 therebetween, but the cross-sectional shape in a direction orthogonal to the protruding direction May be a straight shape (parallel shape) that does not change, or may be a tapered shape that tapers toward the inner tip side, and the shape of the teeth may be arbitrarily determined in the implementation.

In the above embodiment, the assembly procedure of the stator 15 has been described by first inserting the first coil portion 51 of the coil 43 into every other tooth 42. However, all such first coil portions 51 are used. After that, the second coil portion 52 may be inserted into all the teeth 42 in the same manner.

In the above embodiment, the wire forming the coil 43 is a rectangular wire having a rectangular cross section, but is not limited thereto, and may be a round wire having a circular cross section.

The present invention can be used not only for a hybrid construction machine but also for a hybrid automobile, an electric automobile, and an electric construction machine.

DESCRIPTION OF SYMBOLS 10 ... Generator motor which is a rotary electric machine, 14 ... Rotor, 15 ... Stator, 42 ... Teeth, 43 ... Coil, 48 ... 1st insulator, 49 ... 2nd insulator, 48A, 49A ... Fitting part, 51 ... 1st Coil part, 52 ... second coil part, 53 ... connecting part, 54 ... projecting part, Z ... rotation center axis.

Claims

An annular stator;
In a rotating electrical machine comprising a rotor that is rotatably arranged on the inner peripheral side of the stator,
The stator is provided with a plurality of teeth protruding toward the rotor side at equal intervals in the circumferential direction,
A coil around which a wire is wound is inserted into the teeth,
The coil is separable into a first coil portion on the proximal end side of the teeth and a second coil portion on the distal end side, and the first and second coil portions are formed by a part of the strands. A rotating electrical machine characterized by being connected to each other at a connecting portion.
In the rotating electrical machine according to claim 1,
The coil includes a projecting portion formed by projecting the connecting portion along another rotation center axis of the rotor with respect to another wound portion.
In the rotating electrical machine according to claim 1 or 2,
A first insulator that is inserted into the base end side of the tooth and wound with the first coil portion; and a second insulator that is inserted into the distal end side and wound with the second coil portion;
A rotating electrical machine characterized in that fitting portions that are fitted to each other are provided at end portions of the first and second insulators that are close to each other.
The rotating electrical machine according to any one of claims 1 to 3,
The rotary electric machine characterized in that the posture of the second coil part with respect to the first coil part is maintained by the shape retaining property of the connecting part.
The rotating electrical machine according to any one of claims 1 to 4,
The rotating electric machine characterized in that the strand is a rectangular wire having a rectangular cross section.
An annular stator;
In a rotating electrical machine comprising a rotor that is rotatably arranged on the inner peripheral side of the stator,
The stator is provided with a plurality of teeth protruding toward the rotor side at equal intervals in the circumferential direction,
In the teeth, a coil around which a wire that is a rectangular wire having a rectangular cross section is wound is inserted,
The coil can be divided into a first coil portion wound around a first insulator inserted on the proximal end side of the teeth and a second coil portion wound around a second insulator inserted on the distal end side. In addition, the first and second coil portions are connected to each other by a connecting portion formed by a part of the element wire, and the connecting portion is rotated around the rotation center axis of the rotor with respect to another wound portion. A rotating electrical machine characterized by having a protrusion formed by protruding along the axis.