摘  要：介绍了一种基于光学传感器、直线运动平台和dsPIC单片机的精密长度测量仪，并着重介绍了测量仪中以LMD18200为驱动芯片的直流电机控制系统。文章详细描述了该电机控制系统的硬件电路、控制策略和软件设计。经实验验证，该电机控制系统在低速时运行平稳、响应速度快、调速性能良好，可满足测量仪的性能要求，并且成本低廉，运行可靠。
关键词：长度测量仪；电机控制；LMD18200

Abstract:This paper introduced a measuring instrument of micro-length based on optical sensor,linear motion platform and dsPIC MCU in brief,and highlights the control system of DC motor using LMD18200 in the measuring instrument.Described the hardware design scheme and control strategy of the control system.The experimental results show the motor control system working steadily,high performane and low cost in the low speed.
Key Words: Measuring instrument；Motor control；LMD18200