Patent ID: 7312552
Filing Date: 2007-12-25
Classification: H02K,Y02E

Abstract:
1. An armature winding of a rotary electro-dynamic machine in which plural strand conductors which pile up respectively are stored in respective winding slots of a stator core comprising plural ventilating ducts in the radial direction and plural winding slots in the axial direction, the strand conductors being formed so as to be twisted and transposed continuously toward the extending direction of the winding slot at a portion stored in the winding slot, 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 sub core sections whose duct factor of the ventilating ducts are different are arranged in part of the stator core, and the transposition angle of the strand conductors in the stator core is made different from the transposition angle to minimize the unbalanced voltage in the strands caused by magnetic fluxes crossing in the strands in the core or between the strands in the core and the strands at the end portions of the core when the stator space factor is uniform in the stator core, so as to offset the unbalanced voltage occurring in the strands due to the magnetic reluctance of the stator core, the magnetic reluctance being varied by the sub core section.