An offsetting and a driving magnetic field should be provided to the giant magnetostrictive materials micro actuator to work. The former optimizes the performance of GMM and eliminates the double frequency effect; the latter determines the output displacement of the actuator. A controlled current source design is presented, it adopts a float-load current source circuit and a DA module of ARM processors to make specified current flow through the coil to get different magnetic strength. The implementation of the design can output current that ranges between ± 5A maximally to the offsetting and driving coil. Wlth this current source, the visual and flexible control of the micro actuator is achieved.%超磁致伸缩微驱动器的工作主要需要提供一个可控的偏置磁场和驱动磁场,前者使超磁致伸缩材料的磁致伸缩特性得到优化,消除倍频效应,后者实现对微驱动器的输出位移控制；设计一个可控电流源,采用悬浮负载功率放大恒流电路,并通过ARM处理器的数模控制,使指定电流通过电磁线圈以产生所需磁场强度；该设计的可控电源,可输出最大±5A的电流,提供给偏置和驱动线圈,实现微驱动器的直观、灵活的控制.
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