New Magnetic Force Control Method Using Giant Magnetostrictive Material

摘要

A new magnetic force control method using a giant magnetostrictive material (GMM) is proposed. Magnetization of GMM varies with applied stress. In a magnetic circuit composed of a permanent magnet and magnetic yokes, the change of magnetization can be transduced into magnetic force variation. The feasibility of this method is examined by a simple experiment. For the purpose of estimating the force variation, the magnetic circuit is analyzed by finite element method on the assumption that the magnetization variation is equivalent to relative permeability change. This magnetic force control method is expected to be applicable to magnetic actuators and has advantages such as high response, low heat generation and high energy conversion efficiency inherent in the characteristics of GMM.