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. 01, 1979
Filed:
Jul. 13, 1977
Robert S Peterson, Williamsville, NY (US);
Westinghouse Electric Corp., Pittsburgh, PA (US);
Abstract
A speed control system is disclosed for a direct current motor drive energized by a thyristor armature supply. Voltage regulation for the thyristor supply is through a parallel current controller in which an armature current controller is arranged in parallel with positive and negative rate current controllers, the output of this parallel combination being applied as a voltage control signal to the thyristor supply through a parallel switch which mandates priority of control. Normally, the current controller will determine the thyristor armature supply voltage, but if the armature current rate exceeds a preset current rate reference, the parallel switch intercedes and the appropriate rate current controller takes over control of the thyristor supply voltage. When the thyristor armature supply current rate goes below the rate reference setting, the armature current controller will again resume control of the thyristor supply voltage.