Magnetic Levitation System by Reluctance Control: Levitation by Motion Control of Permanent Magnet

Abstract

A new type of active magnetic levitation system is proposed. In this system, the forces of permanent magnets are used for levitation and controlled by adjusting the reluctance of the magnetic circuit. Using permanent magnets, the feature of this system is effective for saving energy and avoiding heat generation. First, the principle of the levitation system and typical reluctance control methods are described. Second, an experimental device based on the principle is introduced. The reluctance of this device is controlled by adjusting the air gap between a permanent magnet and a levitated object. To adjust the air gap, a voice coil type DC linear motor is used. Third, the feasibility of this system is considered from linear control theory. The stability of the system with PD feedback loop is also considered. Last, experimental results verify the realization of the reluctance control levitation system and the appropriateness of the theoretical analysis.