Abstract
A new type of magnetic force control device composed of two functional materials, a giant magnetostrictive material and a piezoelectric material, is proposed for coil-less magnetic force control. The magnetic force control is based on the inverse magnetostrictive effect of Terfenol-D coupled via strain with the piezoelectric actuator and the variation of the voltage applied to the piezoelectric actuator is converted to the variation of magnetic force via a magnetic circuit in the device. Because the piezoelectric actuator is an electrically capacitive load, this magnetic force control method has the advantages of zero power consumption and zero heat generation in steady-state operation. In this paper, the principle of magnetic force controlling is described and the characteristics of the device are investigated with experiments.
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