以四色胶印机墨斗为平台，以PIC18F2580单片机为控制核心，设计了一套完整的直流电机闭环调速控制系统。详细设计了系统硬件电路，着重设计了与操作台和PC机通讯的CAN通讯接口电路、电机控制与驱动电路、电机位置闭环反馈电路和电机PWM调速电路，编写了系统的C语言驱动程序。经实验和实际环境下的运行证明，该系统具有良好的驱动性能、调速性能和抗电磁干扰性能，有利于降低成本，有利于国产胶印机的自动化、智能化进程，有良好的市场应用前景。

The DC motor control system with closed loop and speed regulation was designed with PIC18F2580 microcontroller as control unit for inking system of four-color offset press as basement. The circuit was designed in details. CAN bus interface circuit for communication to the console panel and PC, motor control and drive circuit, closed loop motor location feedback circuit, and PWM motor speed regulation circuit were designed with emphasis. The system software was compiled with C language. Experiment and actual operation showed that the system performs good driving performance, speed regulation and anti-electromagnetic interference performance. It can reduce costs and accelerate the automation and intelligent process of domestic offset. It has good market prospects.