Patent ID: 6462506
Filing Date: 2002-10-08
Classification: B60L,Y02T

Abstract:
A control system for controlling the current and voltage of an electric shunt wound motor associated with an electric vehicle, said motor including an armature coil and a field coil, said system comprising:a plurality of switching devices electrically coupled in an H-bridge circuit and electrically coupled to the field coil; a plurality of switching devices electrically coupled in a half H-bridge circuit, wherein a first switching device Is electrically coupled in parallel with the armature coil and a second switching device is electrically coupled in series with the armature coil; and a freewheel diode electrically coupled in parallel with the armature coil; and means for measuring armature current in a negative quadrant of a field coil map, said system selecting a field coil current for controlling the field coil based on the measured armature current.