Realization of Zero-power Control in a Two-degree-of-freedom Parallel Magnetic Suspension System

Abstract

Parallel magnetic suspension that controls multiple floators or multi-degree-of-freedom motions with a single power amplifier has already been realized. This study focuses on zero-power control in a two-degree-of-freedom parallel magnetic suspension system. The zero-power control is achieved by feeding back the integral of the control current. The characteristics of the zero-power control system are studied from an aspect of response to a stepwise disturbance. When the disturbance acts on one of the suspended points, a steady displacement appears only in the corresponding suspended point. To confirm this prediction, step responses are measured in the experimental apparatus.