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Design and Study on Power Supply for Giant Magnetostrictive Accurate-motion Actuator

机译：巨磁致伸缩精密运动执行器电源设计与研究

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摘要

The architecture and operation theory of Giant Magnetostrictive Accurate-motion Actuator have been introduced. After analysing the driving characteristic of giant magnetostrictive material and requirement of driving power, a design method of wide range and high precision NC constant-current source has been put out. The output circuit is composed of serial 12-bit DACs Max531, low-noise high-speed precision operational amplifiers OP27 and driving circuit. It provides current from 0 to 2.048A with 0.5mA step value. Two fully differential input channels 16-bit, sigma-delta ADCs AD7705 collects output current in feedback loop. Current ripple is controlled under 0.25mA through using homemade high-performance linear power. The result shows that the driving power with characteristic of high stability and fast response meets the needs of driving of Giant Magnetostrictive Accurate-motion.
机译：介绍了巨磁致伸缩精确运动执行器的结构和工作原理。在分析了巨磁致伸缩材料的驱动特性和对驱动功率的要求之后，提出了一种宽范围，高精度的NC恒流源设计方法。输出电路由串行12位DAC Max531，低噪声高速精密运算放大器OP27和驱动电路组成。它提供0至2.048A的电流，步进值为0.5mA。两个全差分输入通道16位sigma-delta ADC AD7705收集反馈环路中的输出电流。通过使用自制的高性能线性电源，电流纹波控制在0.25mA以下。结果表明，该驱动力具有稳定性高，响应速度快的特点，可以满足巨磁致伸缩精确运动的驱动需求。

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