High Performance Speed Control Based on Instantaneous Speed Observer Considering the Characteristics of DC Chopper in Low Speed Range

Abstract

This paper proposes a new high performance speed control method for wide speed range, which is based on instantaneous speed observer considering the characteristics of DC chopper. In order to regulate a motor speed for wide speed reference including a very low speed range, this paper designs the instantaneous speed observer which uses the information of an armature current and an armature voltage. This observer has no effect of inertia variation and disturbance torque completely, but it has the effect of electrical parameter variation. Hence, this paper proposes a new identification algorithm to cancel out the estimation error caused by both the resistance variation and the voltage drop. The proposed observer can always estimate an instantaneous value of motor speed. The proposed total system becomes a new robust speed servo system for a wide speed range.