Lockheed Martin Energy Research Corporation

John Milton Bailey

Jack S Lawler

A circuit and method for controlling a rotating machine (,) in the constant horsepower range above base speed uses an inverter (,) having SCR's (T,-T,) connected in series with the primary commutation switches (Q,-Q,) to control turn off of the primary commutation switches and to protect the primary commutation switches from faults. The primary commutation switches (Q,-Q,) are controlled by a controller (,), to fire in advance or after a time when the back emf equals the applied voltage, and then to turn off after a precise dwell time, such that suitable power is developed at speeds up to at least six times base speed.

Growing community of inventors

Knoxville, TN, United States of America

John Milton Bailey