A stator in which stator coils are formed by a plurality of unit coils arranged so as to be shifted from each other in the circumferential direction and each having: a first slot-accommodated portion; a second slot-accommodated portion; a first terminal wire extending from the first slot-accommodated portion; a second terminal wire extending from the second slot-accommodated portion and shifted from the first terminal wire by one line of a conductive wire; a terminal-side coil end portion; and first and second anti-terminal-side coil end portions, wherein the first terminal wire and the second terminal wire of the respective different unit coils are joined with each other.

A coil forming apparatus includes: a coil winding jig that winds the belt-shaped coil, the coil winding jig including a plurality of comb-shaped grooves on an outer periphery thereof; a coil conveying mechanism that pivotally conveys the belt-shaped coil along at least a portion of the outer periphery of the coil winding jig; and guide members guide the belt-shaped coil in an arc shape while being in contact with the side ends. The guide members guide the belt-shaped coil so as to be in an arc shape having a diameter smaller than an outer diameter of the coil winding jig in a second half portion of the belt-shaped coil upon pivot conveying, and allow the plurality of straight portions to be inserted into a respective one of the plurality of comb-shaped grooves of the coil winding jig.

The present invention was contrived through attention being focused on the following in a prior-art distributed-winding coil: a solenoid configuration in which winding wires are to be wound is preserved when initially formed, but this configuration tends to be loosened during subsequent steps, and the initial winding sequence of the winding wires, or the position of the winding wires relative to each other, tends to be disrupted, and accordingly must be prevented, when a certain force is applied and the necessary bending or deformation is induced in coils with distributed winding in which the solenoid configuration is preserved, or when the coils are ultimately inserted into slots. Therefore, as a solution, the present invention provides a holding tool 30 provided with: at least two substrates 32 linked at one end so as to be able to open and close; an outlet 31 formed at the other end of the substrates 32; and a holding space 32a capable of opening on the outlet 31 side, and holding the first accommodation portion 11a or the second accommodation portion 11b of a coil 10 while maintaining the alignment state of the winding wires 10A that constitute part of the first accommodation portion 11a and the second accommodation portion 11b when the substrates 32 are closed; the holding tool 30 being capable of forming a twist portion at a first coil end and a second coil end and reducing the size of the coil ends of the coils while maintaining the alignability of the winding wires that constitute part of the first and second accommodation portions of the coil 10.

The wound coil (7) includes first to fourth inner bases (11a) to (11d), first to fourth outer bases (12a) to (12d). The wound coil (7) includes first to fourth upper connection portions (16a) to (16d), first to third lower connection portions (17a) to (17c), and first to fourth winding portions (18a) to (18d). In the first to fourth winding portions (18a) to (18d), the third and fourth upper connection portions (16c) and (16d) are stacked on the first and second upper connection portions (16a) and (16b) in the circumferential direction D1 and the first and third lower connection portions (17a) and (17c) are continuously stacked on the second lower connection portion (17b) in the circumferential direction D1.

In the electric rotating machine, a crank portion that is displaced in a radial direction of an armature iron core is provided in an apex portion of a coil end portion; a first oblique side that slants with respect to an axis-direction endface of the armature iron core connects a first coil conductor portion with the crank portion; a second oblique side that slants with respect to the axis-direction endface of the armature iron core connects a second coil conductor portion with the crank portion; at least one of the first oblique side and the second oblique side has an inflection point, before being connected with the crank portion, that functions as a base point of a bending portion that is bent toward a radially outside of the armature iron core.

In each coil (10), between a first radial section formed by a winding-start section (10a) and a second radial section formed by a winding-end section (10b) of a winding (10A), the circumferential lengths of the winding lap sections formed by said winding change in a continuous or stepped manner. For a first coil, the sequences within two slots (22) of the winding constituting the first coil are reversed with respect to one another by a twisted section (10d) between a first coil end (12a) and a second coil end (12b) of the first coil. The first coil and next second coil form a lap winding in which the twisted sections of the first and second coils are three-dimensionally entwined. The lap winding of said twisted sections continues for the third and subsequent coils, and the first coil end and the second coil end of each coil are continuous without spaces at the end surfaces of a core (20).

Bridge portions forming coil end portions, at both ends in an axial direction, of a stator of the rotating electrical machine according to the present invention are configured coaxially about an axis of the stator; at least one bridge portion of the bridge portions of each coil at both ends in the axial direction is located outward of an inner peripheral surface of the stator; and a gap is present between an end surface of a stator core in the axial direction and each bridge portion.

This rotating electrical machine includes a coil. The coil includes a first coil portion formed of a single-layer lap winding coil arranged on radially outer sides of slots, a second coil portion continuously connected to a first connecting wire portion continuously connected to the first coil portion, and formed of a single-layer lap winding coil arranged on radially inner sides of the slots, and a third coil portion group including a plurality of third coil portions each formed of a double-layer lap winding coil.

Each pair of the forming die and the clamping die holding a straight portion of a plane-bent intermediate coil from both sides in the circumferential direction have equal widths in the radial direction of the coil forming device, and the forming dies and the clamping dies holding a plurality of the straight portions disposed from an inner peripheral side of the coil forming device toward an outer peripheral side of the coil forming device are disposed alternately in the circumferential direction with the straight portions interposed therebetween.

A method for manufacturing a stator that includes attaching a coil portion to slots by pivoting the coil portion about a connecting wire in a state in which a plurality of the coil portions are connected together by the connecting wire for each phase, the coil portions including a first coil portion that includes one first slot-housed portion to be arranged on a radially inner side of a first slot of a stator core and the other first slot-housed portion to be arranged on a radially outer side of a second slot provided at a position spaced away from the first slot in a circumferential direction, the other first slot-housed portion being spaced away from the one first slot-housed portion in the circumferential direction.