Design of Observer of Flux Linkage of Synchronous Drive of Rolling Mill

Abstract

The paper considers the design of control system for variable-frequency synchronous drive with vector torque control. Such drives are used in units with enough wide speed range and shock loading, for example, hot and cold rolling mills. Two coordinates generate the torque of the systems under consideration: current and flux linkage of the stator. This paper provides parameter calculation for the observer of flux linkage state of the stator of synchronous motor with damper windings. The system is implemented based on the Luenberger observer with error-feedback. Flux linkage is determined within the orthogonal coordinate system d, q rotating synchronously with the rotor. The complex of a synchronous exited motor and state observer has been modeled. Modeling results demonstrate that a fractional error of flux linkage generation does not exceed 0.15 %.