Patent ID: 6198190
Filing Date: 2001-03-06
Classification: H02K

Abstract:
An alternator for an automotive vehicle, comprising:a field rotor with N and S poles formed alternately in a circumferential direction, a stator including a stator core disposed in a confronting relationship with said rotor and a multi-phase stator winding associated with said stator core, and a frame supporting said rotor and said stator, whereinsaid field rotor comprises a Lundel-type core having a plurality of hooked magnetic poles serving as said N and S poles,said stator core comprises laminated cores formed with a plurality of slots extending across laminated plates,said multi-phase stator winding comprises a plurality of conductor segments,said plurality of conductor segments are inserted in said slots so as to constitute an inner conductive layer and an outer conductive layer arrayed in a line exclusively in a depth direction of each slot, and are insulated from each other in each slot,said plurality of conductor segments are partially disposed out of said slots so as to extend from an end face of said stator core and form a coil end having a predetermined connecting pattern according to which different layers disposed in different slots spaced at an interval corresponding to a N-and-S magnetic pole pitch of said rotor are serially connected, thereby forming a coil end group chiefly repeating said connecting pattern at the end face of said stator core,said plurality of conductor segments of said coil end are spatially separated from each other and extend in a direction intersectional with a flow direction of cooling air introduced in said frame, so that the cooling air can flow along the surface of said conductor segments of said coil end, andsaid plurality of conductor segments constitute two or more pairs in each slot and arrayed in a line exclusively in a depth direction of each slot.