随着现代工业的不断发展，直流调速系统在许多领域获得了广泛的应用。由于数字控制具有较好的控制性能和较强的抗干扰性，所以成为直流电机的主要控制方式。为了进一步提高直流电机控制的现代化程度，电机的控制方法也由原来的单机独立控制转变为网络化集中控制。 以往数字控制的直流调速系统主要使用单片机或DSP作为控制器，在其内部集成AD、显示、键盘、控制算法、脉冲触发等功能，这种控制方式存在触发脉冲抗干扰能力差，脉冲产生特别依靠软件编程的问题。因此，本系统采用ALTERA公司的CPLD(复杂可编程逻辑器件)EPM7128S完成了数字晶闸管移相触发器的设计，并且集成了硬件所有的逻辑电路，使得电路可靠性大大提高，面积大大缩小。同时采用AD公司的AdμC812完成了双闭环和逻辑无环流可逆调速控制算法以及数据采集、键盘扫描、LCD显示、CAN总线通讯。 随着现场总线的快速发展，网络控制得到了极大的应用。CAN总线是现场总线的一种，具有突出的可靠性、实时性和灵活性。本系统采用PHILIPS公司的SJA1000CAN控制器和TJA1050高速收发器完成了下位机CAN节点的设计。上位机采用周立功公司的CAN并口卡与CAN总线连接，上位机监控程序使用MCGS编写，使整个系统具备了网络通信、控制的能力。

DC timing system has achieved a very broad application in many domains with the rapidly development of modern industrialization. The Digital Control will become the mainstream of DC timing system by good performances and fine ability to resist the disturbance .In order to improve modernization , the control mothed of DC timing system have changed from single control to network control. Formerly, DC timing system controlled by digital controller was realized by singlechip computer and DSP.This kind of DC timing system consists of AD conversion、display、key、 control arithmetic and pluse generate.but,there is several problem in pluse generate ,that is the ability of pluse to resist the disturbance is rather bad and pluse generate especially depend on software. Consequently,Using ALTERA’s CPLD(Complex Programmable Logic Device) EPM7128S,this thesis design the Digital thyristor triggering circuit,and include all CMOS logic device .so it increase the ability of resist the disturbance and lessen the area of PCB. At one time,this thesis finished the control arithmetic of dual-converter and dual-closed-loop of speed and current、data acquisition、key scan、LCD display and CAN bus communication based on AD ‘s AdμC812 MCU. Along with rapidly development of the Field Bus, nerwork control achieved much huge application in the automatic control system.As one of the Field Bus,CAN bus have reliability, real time ability and flexibility. this thesis design CAN node adopt Philips ‘s Stand-alone CAN controller SJA1000 and High speed CAN transceiver TJA1050.PC connect with CAN bus by ZLG’s CANmini Parallel interface,PC supervise software programed by MCGS.As a result ,the system is provided with the functions of network control.