Search International and National Patent Collections

7. (WO2013134217) ALTERNATOR RIPPLE VOLTAGE REDUCTION USING OUTPUT FEEDBACK TO AN INDEPENDENT FIELD COIL

Pub. No.:    WO/2013/134217    International Application No.:    PCT/US2013/029040
Publication Date: Fri Sep 13 01:59:59 CEST 2013 International Filing Date: Wed Mar 06 00:59:59 CET 2013
IPC: H02K 15/02
Applicants: C.E. NIEHOFF & CO.
Inventors: PATTERSON, Ciaran
POURKERMANI, Mahmood
Title: ALTERNATOR RIPPLE VOLTAGE REDUCTION USING OUTPUT FEEDBACK TO AN INDEPENDENT FIELD COIL
Abstract:
A generator comprises first and second field coils whose combined magnetic flux causes stator current within one or more stator windings which, when rectified via a rectifier circuit, produces rectified output current with reduced voltage fluctuations. A filter circuit extracts the AC component of the rectified output current and delivers it to the second field coil. The magnetic flux generated by the second field coil modifies the magnetic flux of the first field coil effectively cancelling the voltage ripples associated with the rectified output current of the generator.