Patent ID: 7728480

Claim:
A dynamoelectric machine comprising: first and second brackets that are each formed so as to have a bowl shape and that are disposed such that openings face each other; a shaft that is rotatably supported at central axial positions of said first and second brackets; a rotor that is fixed to said shaft so as to be rotatably disposed inside said first and second brackets; and a stator comprising: a cylindrical stator core in which slots are arrayed circumferentially so as to be open on an inner circumferential side and that is disposed such that two axial end edge portions are pressed and held between opening edge portions of said first and second brackets so as to surround said rotor; and a stator coil that is wound onto said stator core, wherein: said stator core is configured into a cylindrical shape by abutting end surfaces of a laminated core with each other and integrating said abutted end surfaces by welding; said laminated core is configured by laminating a predetermined number of thin magnetic plates, at least two thin sheet coupling weld portions that integrate said laminated predetermined number of thin magnetic plates by welding being formed so as to extend from a first end to a second end in a direction of lamination on an outer wall surface of said laminated core and so as to have a predetermined spacing; and said stator core is formed by plastically deforming the portions of said magnetic plates between said thin sheet coupling weld portions, such that an axial length A at said thin sheet coupling weld portions and a maximum axial length B between said thin sheet coupling weld portions satisfy an expression: 0.0 mm≦ B−A ≦0.2 mm.