A control device for an electric generator for use with a vehicle engine includes an armature winding (stator) and a field winding (rotor) driven by the vehicle engine. A chopper is provided for controlling the field current of the field winding and a pulse width modulator is provided for controlling...http://www.google.fr/patents/US5231344?utm_source=gb-gplus-shareBrevet US5231344 - Control apparatus for electric generator
