Patent ID: 6713888
Filing Date: 2004-03-30
Classification: F02N,H02J,H02P

Abstract:
A motor-generator apparatus for a vehicle, controlled for selectively operating in an electric motor mode to perform starting of an engine of said vehicle and in an electric generator mode for generating electric power while said vehicle is running, comprising:a field winding type of synchronous machine having a field winding, an AC-to-DC and DC-to-AC power converter for supplying an AC armature current to an armature winding of said synchronous machine during operation in said electric motor mode, a field current supply circuit for supplying a field current to said field winding of said synchronous machine, to produce a field winding magnetic flux, and a control circuit for controlling said AC-to-DC and DC-to-AC power converter and said field winding circuit; wherein while said engine starting is being performed, said AC-to-DC and DC-to-AC power converter supplies to said armature winding said armature current as a current having a component which forms a magnetic flux in the same direction as that of said field winding magnetic flux.