超磁歪・圧電の複合化による磁気力制御用電磁変換素子とその磁気浮上への応用

概要

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This paper describes a novel magnetic force control method using functional materials and its application in a magnetic levitation system. This force control is based on the inverse magnetostrictive effect of giant magnetostrictive material (GMM) and realized by composing a closed parallel magnetic circuit with a permanent magnet in magnetic yoke. The magnetic force between movable and fixed yokes can be adjusted by controlling the strain in the GMM rod. For the purpose of efficiently controlling the strain of the GMM rod, a magnet-electric composite element is constructed, in which two functional materials, a GMM rod and a piezoelectric ring actuator are mechnically coupled via strain. The magnetization in the GMM rod can be controlled by adjusting the voltage of the piezoelectric actuator. It is demonstrated that this element works to adjust magnetic force with low energy consumption and has high frequency bandwidth. As an application of this element. a magnetic levitation system was proposed. With simple PD control, the yoke was successfully levitated and the advantages of low power consumption was confirmed.
一般社団法人日本機械学会の論文
2001-06-25