Patent ID: 7586204

Claim:
A permanent magnet alternator comprising: a shaft driven to rotate, and to generate electricity in windings, and to supply current to a speed detection circuit for detecting a speed of said shaft, and for providing power to a control circuit for a gas turbine engine; a shunt regulator between said windings and said control circuit; a source of voltage to be supplied to the control circuit, and elements for delivering voltage from said source of voltage to the control circuit when a voltage that would be supplied from said shunt regulator would be below a voltage from the voltage source, and for delivering current through said shunt regulator when a voltage delivered from said shunt regulator would be above said voltage from said voltage source; and feedback from said speed detection circuit provided to a control for said shunt regulator to adjust the current delivered from said shunt regulator upwardly if the speed is not being accurately sensed at said speed detection circuit.