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Alternator for an automotive vehicle

  • US 5,998,903 A
  • Filed: 03/16/1998
  • Issued: 12/07/1999
  • Est. Priority Date: 05/26/1997
  • Status: Expired due to Term
First Claim
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1. 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 constitute at least one pair, and are inserted in said slots so as to constitute an inner layer and an outer layer arrayed in a depth direction of each slot, and said conductor segments are insulated from each other in each slot,said plurality of conductor segments are partly 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 field 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 across said conductor segments of said coil end,said plurality of slots comprises a plurality of slot groups, each slot group of one phase consisting of a plurality of slots spaced at predetermined intervals corresponding to the magnetic pole pitch of said field rotor, a first slot set being constituted by slot groups of multiple phases, and a second slot set being phase shifted from said first slot set by a predetermined electric angle,said multi-phase stator winding comprises a first winding of said plurality of conductor segments accommodated in said slot groups included in said first slot set and a second winding of said plurality of conductor segments accommodated in said slot groups included in said second slot set, and said first winding of multi-phase and said second winding of multi-phase are combined so as to generate a summed-up output and are accommodated in said slot groups to be disposed a substantially equal distance in the radial direction from the center of the stator core.

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