Adaptive digital armature current control method for ward-leonard elevator drives using an SCR generator field converter

US5137119A · kind A · utility

Assignee

• OTIS ELEVATOR COMPANY · US

Inventors

• Herbert K. Horbruegger · Berlin, DE
• Mustapha Toutaoui · Berlin, DE

Key dates

• Filing date: Sep 28, 1990
• Grant date: Aug 11, 1992
• Expiry date: Sep 28, 2010

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B66B1/30
• WIPO field: Handling
• WIPO sector: Mechanical engineering

Abstract

A current regulator phase controls a power signal to control silicon controlled rectifiers arranged in a bridge. The silicon controlled rectifiers excite a generator field of an elevator drive. Discontinuity in the generator field current, caused by the inductive load and latching and holding currents in the silicon controlled rectifiers, is detected to provide an analog discontinuity signal. The analog discontinuity signal is converted to digital form and used to dynamically alter the gain and response of the regulator.