Skip to Content
Find More Like This
Return to Search

Constant power speed range extension of surface mounted PM motors

United States Patent

May 22, 2001
View the Complete Patent at the US Patent & Trademark Office
Oak Ridge National Laboratory - Visit the Partnerships Directorate Website
A circuit and method for controlling a rotating machine (11) in the constant horsepower range above base speed uses an inverter (15) having SCR's (T1-T6) connected in series with the primary commutation switches (Q1-Q6) to control turn off of the primary commutation switches and to protect the primary commutation switches from faults. The primary commutation switches (Q1-Q6) are controlled by a controller (14), 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.
Lawler; Jack Steward (Knoxville, TN), Bailey; John Milton (Knoxville, TN)
Lockheed Martin Energy Research Corporation (Oak Ridge, TN)
09/ 507,057
February 21, 2000
STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH The U.S. Government has a paid-up license in this invention and right in limited circumstances to require that the patent owner license others on reasonable terms as provided for by the terms of Contract No. DE-AC05-96OR22464 awarded by the U.S. Department of Energy to Lockheed Martin Energy Research Corporation.