Patent ID: 7944110
Filing Date: 2011-05-17
Classification: H02K,Y10T

Abstract:
1. A stator in a rotating electric machine, the stator comprising: a stator core formed in a cylindrical shape provided with plural teeth and plural slots on a radial inner circumference of said top end cover between each two adjacent teeth in a peripheral surface; and a stator winding disposed inside each of the plural slots, wherein: each slot of the plural slots has a slot peripheral wall and a slot opening that opens in the inner peripheral surface; the slot peripheral wall of said each slot has a slot bottom wall and a pair of slot side walls opposing to each other and continuing to the slot bottom wall; the slot opening is formed between hanging portions hanging out from the pair of slot side walls; the slot peripheral wall is covered with an insulation coating made of an electrical insulation material; the insulation coating is formed over continuously from the slot bottom wall to portions adjacent to the hanging portions at the outer peripheral sides of the hanging portions; a pair of holding grooves opposing each other are formed in the insulation coating on the pair of slot side walls at vicinity of the slot opening; groove walls of the pair of holding grooves are formed in the insulation coating; an electrical insulation member for closing the slot opening is inserted into and held between the pair of holding grooves; the slot opening has a predetermined width in the circumferential direction; the insulation coating on the pair of slot side walls forms an internal space with the electrical insulation member and the internal space is surrounded by the insulation coating and the electrical insulation member; the internal space has a space width in the circumferential direction substantially equal to the predetermined width in an area extended from a portion adjacent to slot bottom wall to a portion adjacent to the holding grooves; and a teeth width of the each tooth is gradually decreased from a bottom portion adjacent to the slot bottom wall toward to a portion adjacent to the holding grooves.