Patent ID: 6943466

Claim:
A stator for a dynamoelectric machine comprising: an annular stator core in which a large number of slots having grooves lying in an axial direction are formed in a circumferential direction so as to open onto an inner circumferential side; and a stator winding installed in said stator core, said stator winding being provided with a plurality of winding sub-portions constructed by installing base strands in said slots at intervals of a predetermined number of slots so as to alternately occupy an inner layer and an outer layer in a slot depth direction and welding end portions of said base strands, said base strands being formed by coating an electrically-insulating coating onto a metal wire material, and joint portions between said end portions of said base strands being arranged into at least one row in a circumferential direction, wherein a first electrically-insulating layer is formed so as to cover each of said joint portions and to bridge a pair of said joint portions that is adjacent in at least one direction selected from a group including a radial direction and a circumferential direction, a second electrically-insulating layer is formed so as to cover said first electrically-insulating layer and to extend to said electrically-insulating coating of said end portions of said base strands, and said first electrically-insulating layer has a modulus of elasticity that is larger than a modulus of elasticity of said second electrically-insulating layer.