【摘要】 为了控制压电精密流量阀的流量,须对阀芯的开合作高精度调节。压电陶瓷可以实现微纳米级高精度定位。依据电压控制型压电陶瓷驱动电源的原理,利用运算放大器OPA277P和PA90构成的复合式高压运算放大电路,设计了一种高精度的压电陶瓷电源,并构建了压电陶瓷的模糊自适应PID控制系统,用于控制阀芯的精密定位。并针对PID控制、模糊PID控制试验的结果进行比对分析,结果表明:该控制系统具有超调量小、控制精度高、调整时间短、动态响应快、稳态误差小等特点。更多还原

【Abstract】 In order to control the flow of the piezoelectric-driven flow valve,a high precision fine-tuning for the valve spool was required. The piezoelectric ceramic is a kind of high-precision positioning actuator. Based on the principle of voltage-controlled piezoelectric ceramic driving power,a high precision piezoelectric ceramic drive was designed by using a high-voltage operational amplifier circuit consist of amplifier PA90 and OPA277 P. And a fuzzy adaptive PID control system of piezoelectric ceramic was built to drive precision fine-tuning of the valve spool. Through comparing the result of the PID control experiment and fuzzy PID control experiment,the experimental results show that this system has small overshoot,high control accuracy,short adjusting time,fast dynamic response and low steady error.更多还原