基于LabVIEW软件平台和简单硬件,研制了数字伺服原理实验系统.系统运用LabVIEW软件编制人机界面用于描绘实验曲线、控制参数设定和进行运算,数据采集卡采集传感器信号的同时输出PWM控制信号,此控制信号通过直流电动机驱动电路实现直流电动机的运动控制,编码器和电流传感器实时生成电流和速度信号并被采集卡采集,磁粉制动器提供实验所需负载.该系统采用直流电动机加传感器方式代替伺服电动机,采用LabVIEW软件减化编程,实现伺服电动机开环、闭环、双闭环、前馈等控制,并且可以设定不同控制参数,同时可以获得各种控制模式及参数下的实时曲线,能够全方位的展现伺服控制原理.通过该实验系统,同学们可以充分了解伺服控制原理,掌握伺服电动机控制方法.%A LabVIEW software platform and simple hardware were used to develop the digital servo principle experiment system in this article.The LabVIEW software was used to design the man-machine interface which was used to describe the experimental curve,control parameters,setting and computing.The sensor signals were collected with the data acquisition card,the PWM control signals were reported,also.Then,a DC motor was controlled by DC motor driving circuit when the control signal was achieved.The electric current and speed signal which were generated by encoder and current sensor were achieved with the sampling card.The load was provided though magnetic powder brake in this experiment system.The DC motor and sensor were used to replace the servo motor,and the LabVIEW software was used to simplify programming in this system.Open loop,closed loop,double closed loop and feed forward control could be realized,different control parameters could be set,also.The real-time experimental curve could be get under all kinds of control mode and parameters at the same time.The servo control principle could be full displayed.The students can fully understand the servo control principle and servo motor control method through this experiment system.
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