Production method for rotating electrical machine
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.
1. A production method for a rotating electrical machine including: a stator having a stator core including an outer core as an annular back yoke portion and an inner core as a plurality of tooth portions, and a plurality of insulated and coated coils each received in two slots each formed between the two tooth portions adjacent to each other, the coils extending over the plurality of tooth portions of the stator core; and a rotor rotatably supported at an inner side of the stator core, the production method comprising:
a winding step of continuously forming intermediate coils each including two slot received portions to be received in the slots of the stator core and two bridge portions by which both end portions of the slot received portions are connected, into a flat plate shape from an insulated and coated conductor wire by using a winding frame that has winding core and side plates that sandwich the winding core from both side surface sides thereof, and a protection that restricts a winding width of the bridge portions is provided on the inner surfaces of the side plates;
a coil shaping step of twisting the two slot received portions of each intermediate coil and shaping each bridge portion into a circular arc shape;
a coil temporary mounting step of temporarily mounting each coil subjected to the coil shaping step, obliquely in the two slots;
a coil inserting step of pressing the slot received portions of each coil subjected to the coil temporary mounting step, from an outer side to a radially inner side to insert the slot received portions into the slots;
a core assembly step of inserting the inner core having each coil mounted thereon, into the outer core; and
a final assembly step inserting the rotor into the stator and housing the stator and the rotor in a frame.
2. The production method for the rotating electrical machine according to claim 1 , further comprising a teeth fixing process of radially fixing the plurality of independent tooth portions, prior to the coil temporary mounting step.
3. The production method for the rotating electrical machine according to claim 1 , wherein the coil inserting step includes pressing entireties of outer peripheral surfaces of the slot received portions of the coil temporarily mounted obliquely in the slots, by a rotary plate jig rotating about one point, to insert the slot received portions.
4. The production method for the rotating electrical machine according to claim 1 , wherein the coil inserting step includes pressing outer peripheral surfaces of the slot received portions of the coil temporarily mounted obliquely in the slots, from one end side toward another end side in an axial direction by a roller jig to insert the slot received portions.
5. The production method for the rotating electrical machine according to claim 1 , wherein the coil inserting step includes inserting the inner core into a cylindrical slide jig to insert the slot received portions of the coil temporarily mounted obliquely in the slots, into the slots.