A micro-position system of a giant magnetostrictive actuator

In this paper, a micro-position system is proposed and developed. This newly developed micro-position system contains a giant magnetostriction actuator (GMA), a digital control constant current source, a TMS320C31-based digital signal processor (DSP) position control board and a capacitive sensor. The digital control constant current source can be adjusted continuously from 0 A to 1.551 A and its resolution is up to 0.3788 mA. This micro-position system has good stability and high anti-noise ability, and can achieve 40 nm position resolution because of using the high precision capacitive sensor, the newly developed digital control constant current source and the TMS320C31-based DSP position control board.