Back to results
US 5,691,590 AGranted
Alternator with magnetic noise reduction mechanism
AssigneeNippondenso Co., Ltd.
InventorsJunji Kawai, Atsushi Umeda
Life of this patent
Estimating the term…
Abstract
In an alternator for a vehicle having a field coil for generating rotating magnetic field and stator coils for generating alternating current voltages in response to the rotating magnetic field, the stator coils are grouped and wound in a dual winding system. In order to reduce magnetic noise, a first group of coils are provided in contact with a stator core and the second group coils. The first and second group of coils are shifted from each other by .pi./3 radian in electrical angle.
Claims16
An alternator for a vehicle comprising:
- a generally cylindrical frame;
- a rotor rotatably supported by said frame and having pole cores for generating a rotating magnetic field;
- and
- a stator fixedly supported by said frame,
- wherein said stator includes:
- a plurality of equi-angularly spaced teeth extending radially inwardly toward said rotor with respective slots between said plurality of teeth, said plurality of equi-angularly spaced teeth of said stator including six teeth per two pole-pitch of said rotor;
- and
- a plurality of stator coils having a first group of three stator coils and a second group of three stator coils, each of said first group of three stator coils and each of said second group of three stator coils being wound on one of pair of adjacent ones of said six teeth, said first group of three stator coils being shifted from said second group of three stator coils by .pi./3 radian in electrical angles.
5 more elements
An alternator for a vehicle comprising:
- a rotor having a plurality of rotor-side magnetic poles for providing a rotating magnetic field when driven by a vehicle engine;
- a stator having a stator core and stator coils for providing a plurality of stator-side magnetic poles opposing to said rotor-side magnetic poles;
- said stator coils being divided into a first group of coils and a second group of coils, said first group of coils being wound in three-phase for providing three stator-side magnetic poles per two magnetic pole-pitch of said rotor-side magnetic poles and said second group of coils being wound in three-phase for providing three stator-side magnetic poles per two magnetic pole-pitch of said rotor-side magnetic poles;
- said stator-side magnetic poles provided by said first group of coils and said second group of coils being shifted .pi./3 radian in electrical angles from each other;
- and
- said stator-side magnetic poles provided by said first group of coils and said second group of coils having a part of said stator core common to each other.
3 more elements
Dependencies are inferred from the claim text.