Abstract
In this paper, a simple structured feedback compensation scheme for a DC electric servo system to keep the response characteristics unchanged regardless of the load variation is proposed.
In a DC servo motor, the angular velocity is determined by the output torque and the armature voltage. The influence of the output torque which depends on the external load must be eliminated to make the system load insensitive. Several feedback compensation methods have been developed to eliminate the influence. As a result of the compensation, angular velocity of a DC servo motor is determined only by the error signal. Consequently, the closed-loop servo system is made load insensitive. Joint utilization of the proposed compensation and acceleration and velocity feedback compensation can offer extended freedom for design of a load insensitive servo system. Applicable region of the proposed schme can be specified through stability considerations. The compensation scheme has been verified to be effective by the static response and the dynamic response in the time domain and the frequency domain through experiments.
