Abstract
In recent years, demodulating compensators have been used occasionally as stabilizing networks in the all AC servomechanism. Since the compensation obtained by the use of demodulating compensator is independent of carrier frequency variation, such a compensating network is superior to the bridged-T or parallel-T networks that are commonly used for stabilizing purpose in the AC carrier control system. The effect of demodulating compensator in the AC carrier control system can be considerably simplified by the substitution of an equivalent DC network. However, the main disadvantage of the usual demodulating compensator is noise output in the form of quadrature component of the carrier.
In this paper, the symmetric phase-lead demodulating compensators which have the small values of the quadrature component are presented, and the performance of these compensators are analyzed. In addition, an example that serves to illustrate the use of the method is presented, and the usefulness of symmetric phase-lead demodulating compensators is recognized by the experimental data describing the actual response of the system.
