中文摘要：

为驱动超磁致伸缩伺服阀，结合超磁致伸缩执行器驱动电源与伺服阀用伺服放大器的性能要求设计了超磁致伸缩伺服阀用伺服放大器，并建立了其电路模型，仿真分析了功率运算放大器的开环增益对其输出性能的影响。仿真结果表明，在功率运算放大器开环增益大于80dB时，电路特性可满足设计要求。在驱动负载为额定值时，测试结果表明，样机的输出电流线性度为3％；输出电流2A时，其阶跃响应的调节时间小于0．5ms，幅频宽可达2kHz；在驱动频率小于1kHz时，输出电流失真小且无相位滞后。

英文摘要：

To drive servovalve driven by giant magnetostrictive actuator, a newtype of servo amplifier for servovalve driven by giant magnetostrictive actuator has been designed and the circuit model has been established by considering the specification requirements for the driving power of giant magnetostrictive actuator and the servo amplifier using in servovalve. The effect of the openloop gain of power operational amplifier on its output performance has been simulated and analyzed. The simulation results show that the circuit characteristic can meet the require ments when the openloop gain of power operational amplifier is more than 80 dB. When the driving load is a rated value, the measured results of the prototype are that the linearity of the output current is 3%, the adjusting time of step response is less than 0.5 ms and the amplitudefrequency bandwidth is 2 kHz at 2 A of output current. When the driving frequency is less than 1 kHz, the distortion of output current is small and no phase lagging.