The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 22, 2001
Filed:
Feb. 21, 2000
Jack Steward Lawler, Knoxville, TN (US);
John Milton Bailey, Knoxville, TN (US);
Lockheed Martin Energy Research Corporation, Oak Ridge, TN (US);
Abstract
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.