A method for manufacturing a stator includes an insertion step of inserting a plurality of segment coils into slots of a stator core, and a bending step of repeating, after the insertion step, a process in which a bending member that presses and bends a portion to be a coil end along the circumferential direction is relatively moved in a circumferential direction with respect to the stator core and relatively moved in an axial direction to bend the portion to be a coil end, and then bending is shifted to bending of the next portion to be a coil end adjacent to the bent portion to be a coil end by the bending member.

A method for manufacturing a stator includes an insertion step of inserting a plurality of segment coils into slots of a stator core, and a bending step of repeating, after the insertion step, a process in which a bending member that presses and bends a portion to be a coil end along the circumferential direction is relatively moved in a circumferential direction with respect to the stator core and relatively moved in an axial direction to bend the portion to be a coil end, and then bending is shifted to bending of the next portion to be a coil end adjacent to the bent portion to be a coil end by the bending member.

An assembly for minimizing the springback of wire end portions of electrical wires that are arranged in seats of a ferromagnetic core when they are subjected to twisting, comprising a twisting apparatus which is provided with a fixed body on which a carousel is mounted so that it can rotate. The carousel comprises at least two bushings which are provided with respective channels which are substantially parallel to an axis of symmetry of the carousel, each channel defining at least one receptacle configured to partially accommodate at least one respective wire end portion of a wire that protrudes from a seat of a ferromagnetic core. The at least two bushings are configured to be made rotate in order to perform the twisting of the wire end portions of wires that protrude from the seats of the ferromagnetic core and are partially accommodated in the channels.

A coil end cooling structure includes an insulator, and first and second covers. The insulator has first and second protrusions provided on respective end surfaces of a stator core of a stator in the axial direction, and a link to link the protrusions. The first and second covers are secured to the insulator and cover the coil end on the respective end surfaces of the stator. The link is provided along an inner wall of the slot. The first and second covers are provided with a supply port and a discharge port for a coolant that cools a stator coil provided in a slot of the stator core. The supply port is provided on a lower side in a direction of gravity, and the discharge port is provided on an upper side in the direction of gravity.

A coil end cooling structure includes an insulator, and first and second covers. The insulator has first and second protrusions provided on respective end surfaces of a stator core of a stator in the axial direction, and a link to link the protrusions. The first and second covers are secured to the insulator and cover the coil end on the respective end surfaces of the stator. The link is provided along an inner wall of the slot. The first and second covers are provided with a supply port and a discharge port for a coolant that cools a stator coil provided in a slot of the stator core. The supply port is provided on a lower side in a direction of gravity, and the discharge port is provided on an upper side in the direction of gravity.