Patent ID: 7579739

Claim:
A rotary electro-dynamic machine comprising, a rotor having a rotating shaft rotatably supported; a stator core in which plural winding slots extending along the axis of the rotating shaft of the rotor are arranged and plural ventilating ducts are arranged in a radial direction, and an armature winding constituted by many strand conductors stored and piled in each of the winding slots, the strand conductors being formed so as to be twisted and transposed continuously toward the extending direction of the winding slots at portions stored in the winding slots, and the strand conductors being short-circuited at the ends of the armature winding which protrude outward from the sides of the stator core, wherein the length of the stator core corresponding to transposition pitch 180 degrees of the strand conductors is set as one core unit area, sub core sections including portions where space factors are different from that of the stator core such that the total sum of inter-strand voltages induced in the strand conductors in an odd-numbered core unit area from one end portion of the stator core offsets the total sum of inter-strand voltages induced in the strand conductors in an even-numbered core unit area from the end portion of the stator core.