This system USES photoelectric coder as speed detecting sensor, USES PID digital controller as control method, USES PWM signal as control output to regulate speed.

该系统采用光电编码器作为速度检测传感器，控制方式采用PID数字控制，控制输出采用PWM数字信号至驱动电路对电机调速。

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The scheme can be implemented by using the CPLD chip, and used for the channel coder in a radar digital optic-fiber communication system and improving the features of clock extraction.

用复杂可编程芯片(CPLD)实现，并用于雷达数字光纤通信系统的信道编码，提高了时钟提取的性能。

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A weighing sensor (5), the stepper motor driving the digital servo valve and the coder (10) on the digital valve (1) are respectively connected with the PLC (7) by signal circuits.

所述的称重传感器(5)、驱动数字伺服阀的步进电机以及数字阀(1)上的编码器(10)分别通过信号线路与所述的PLC(7)连接。

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