Positive-feedback phase-space trajectories and application to servo systems

The phase-space trajectories for second- and third-order positive-feedback servo systems are investigated. These trajectories, together with the negative-feedback phase-space trajectories, are used to design fast-response servo systems, which switch back and forth between positive and negative feedback modes. The approach used for the third-order systems may be applied to higher order systems. Experimental results of simulated systems are presented.