The invention includes an electric machine having a rotor, stator and at least one winding in the stator adapted to conduct a current, and a secondary winding, electrically isolated from the first winding and inductively coupled to the first winding, which may be used to control at least one of the output...http://www.google.co.uk/patents/US20050242785?utm_source=gb-gplus-sharePatent US20050242785 - Architecture for electric machine
