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三、数模转换与模数转换在过程控制系统中,数模转换与模数转换是必不可少的接口,最直观的数模转换是步进电机。每给步进电机控制电路一个控制脉冲,步进电机就转动一固定的角度,这样可以给定一脉冲数,步进电机就转动相应的角度。如步进机带动的是电位计,则电位计的输出电压随步进机的转角而变化,这就完成了从脉冲数到电压的转换。最简单的模数转换是光电码盘,即在电动机轴上安装一光电码盘(图13),在码盘上有一圈小孔,在码
Third, digital-analog conversion and analog-digital conversion In the process control system, digital-analog conversion and analog-digital conversion is an essential interface, the most intuitive digital-analog conversion is a stepper motor. Each stepper motor control circuit for a control pulse, the stepper motor to rotate a fixed angle, so you can give a pulse number, the stepper motor to rotate the corresponding angle. If the stepper is driven by the potentiometer, the potentiometer output voltage changes with the stepping angle of the machine, which completed from the pulse number to voltage conversion. The simplest analog-to-digital conversion is a photoelectric encoder, which is mounted on the motor shaft of a photoelectric encoder (Figure 13), the encoder has a small hole in the code