毕业设计----基于PIC的直流电动机调速控制系统

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1、 1 基于 PIC18F458 的直流电动机 PWM 调速控 制系统设计 电源电路 控制系统需要一个稳定的工作电压才能可靠工作，本系统的 IR2111 放大器要士 12V; PIC 单片机、数码管驱动、显示电源需要+5V;考虑到本系统的情况，采用了直接从市场上 购买开关电源来满足要求，如图 3.3 所示。 图 3.5 所需电源 3.6 复位和时钟电路 为了预防系统在突然情况下出现死机等问题， 特设计复位电路进行对程序计数器的 PC 重新赋值并重新开始工作， 根据 PIC18F458 系列单片机的特点， 采用典型的复位电路接法， 不仅可以在上电时自动复位，还可以在程序运行中手动复位，手动复位只需

2、要按下复位电 路中的按键即可。如图 3.6。 2 图 3.6 复位和时钟电路 Abstract Nowadays， automatic control systems have been widely used and developed in Every aspect of life. As the artery in the area of electric drive systems DC drives become more and more important in modem Production. For a long time，DC motor has Possessed th

3、e main role in the area of electric drive because of its neatly adjustment, simple method and smooth timing in a wide range，besides， its control Performance excellent. DC motor is widely used on the automatic equipments，such as CNC and industrial robot. As the scale of Production becomes larger and

4、larger，the demand and requirements become higher and higher ,so the research on improving the DC controlling system behavior has important sense. This design is a system of DC motor multiple speeds Based on PIC MCU is designed，as its necessary test equipment. It finished the total Project design of system and model selection .The hard ware and software design of the system according to the Preceding solutions are discussed detailed. 3 For the hardware Part after a dissertation on the whole desig