A vehicle motor-generator apparatus based on a field winding type of synchronous machine coupled to a power inverter and a battery, wherein the synchronous machine is controlled to operate as a motor to perform engine starting and thereafter be driven by the engine as an electrical generator, wherein...http://www.google.ca/patents/US6713888?utm_source=gb-gplus-sharePatent US6713888 - Vehicle motor-generator apparatus utilizing synchronous machine having field winding
