Rotating electrical machine and method for manufacturing rotating electrical machine

A rotating electrical machine, comprising:

• a stator including a stator winding made up with a plurality of conductor segments each constituted with flat wire formed into a substantially U-shape installed through a plurality of slots formed in a stator core;
• and
• a rotor rotatably disposed at an inner side of the stator, wherein:
• the stator winding includes the plurality of conductor segments inserted through the slots from one end surface of the stator core with end portions of the conductor segments projecting out beyond another end surface of the stator core, and is formed by welding an end portion of each conductor segment, among the plurality of conductor segments, with an adjacent end portion of another conductor segment;
• the conductor segments each include an undeformed portion, a plastically deformed portion formed at the end portions thereof and a tapered portion formed between the undeformed portion and the plastically deformed portion;
• the plastically deformed portion is formed so that a dimension of the plastically deformed portion, measured along a circumferential direction of the stator, is greater than a dimension of the undeformed portion measured along the circumferential direction of the stator and so that a dimension of the plastically deformed portion, measured along a radial direction of the stator, is smaller than a dimension of the undeformed portion measured along the radial direction of the stator;
• and
• the conductor segments are welded together at tops of the plastically deformed portions thereof.