A Nonlinear Compensator of Zero-Power Magnetic Suspension for Zero-Compliance to Direct Disturbance

Abstract

A vibration isolation system have been presented in this paper using an active and linearized zero-power control technique. Zero-compliance to direct disturbance of the system could be achieved by connecting a normal spring with a negative stiffness spring in series. Negative stiffness can be obtained by zero-power control magnetic suspension system. However, the basic zero-power control magnetic suspension system has inherently nonlinear characteristics, which leads to performance degradation in the field of practical applications. In this research, a nonlinear compensator for zero-power magnetic suspension is designed and applied to a vibration isolation sys-tem. The nonlinear characteristic of the zero-power control magnetic suspension system is illustrated analytically and the effectiveness of the derived linearized control scheme is demonstrated experimentally.