Patent ID: 7292003

Claim:
A motor control system for a polyphase wound field synchronous dynamoelectric machine (WFSDM) used as a motor and a generator, wherein the WFSDM has an integral polyphase permanent magnet generator (PMG) for use in a generating mode, comprising: a scaling amplifier for receiving a signal derived from a polyphase output signal produced by the PMG and amplifying it by an amplification factor K to generate a scaling amplifier output signal that approximates back electromotive force (EMF) potentials developed by main stator windings in the WFSDM; a Clarke transformation that receives the scaling amplifier output signal and converts it to a Clarke transformation output signal that comprises two orthogonal electrical potentials V x and V y representing direct and quadrature axis electrical potentials for a main rotor in the WFSDM; a real power P and imaginary power Q (PQ) motor current controller that receives the Clarke transformation signal and generates a PQ motor current controller output signal that comprises two orthogonal electrical currents I x and I y representing direct and quadrature axis electrical currents that should drive the main rotor of the WFSDM at desired rotational speeds of the WFSDM with measured levels of input electrical potentials and currents; an inverse Clarke transformation that receives the PQ motor current controller output signal and converts it to an inverse Clarke transformation output signal representing reference levels of drive current for each respective phase of the WFSDM; a comparator for comparing the inverse Clarke transformation signal to actual values of current that the WFSDM receives for each of its respective phases to generate a comparator output signal representative of any difference; a modulator for receiving the comparator output signal and generating an appropriate modulation signal; a gate drive controller for receiving the modulation signal and generating a respective gate drive signal; and an inverter for receiving the gate drive signal and generating motor drive output signals for each respective phase of the WFSDM that are suitable for driving the WFSDM with the desired rotational speed and torque.