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In the fundamental configuration of a giant-magnetostrictive actuator (GMA), a giant-magnetostrictive material (GMM) rod is energized by a coil surrounding it. Continuous electric power supply to the coil is necessary to maintain the expansion of the GMA. However, the electric energy consumption is in proportion to the activation interval of the GMA and becomes larger especially for applications to maintain their expansion in long interval. In order to reduce the electric power consumption during the GMA expanding, this paper presents a new drive method of the GMA which can waste no electric power during GMA expanding. This proposed method utilizes the magnetization/demagnetization characteristics of interior permanent magnets of the GMA to magnetize the GMM during its expansion. But the motion control of developed GMA was restricted only in the 2-position control. Furthermore, this paper also presents the modified power-saving drive method which can give the function of continuously positioning between the 2 positions to the GMA.

Power-Saving Drive of Giant-Magnetostrictive Actuator (Consideration of Position Control Using Magnetic Field of Interior Permanent Magnet)