摘要:本设计基于AT89S52 单片机，以他励直流电动机的数学模型和无静差直流调速理论为理论依据，完成了无转速传感器的直流调速系统的初步设计。实现了直流调速系统的数字化和无速度传感器化，在满足一般工程需要的请情况下，为直流调速系统节省了一套测速装置，既节省了成本，也提高了系统的稳定性。随着微机技术和电力电子技术的发展，高速微处理器和高速开关管应用于直流电动机调速成为可能，打破了以往直流电动机串电阻调速和一些低效率调速的历史。本文用直流电动机的数学模型来估算电机的转速，克服了传统速度传感器的抗干扰性不强的缺点。

关键词 无转速传感器； 直流调速系统； 单片机

Abstract:The design is based on AT89S52 microcontroller, with his excited DC motor mathematical model and no static error DC converter theory as the theoretical basis and completed without speed sensor DC speed control system preliminary design. DC speed control system to achieve digitization and speed sensor technology, to meet the needs of your general engineering case, DC speed control system saves a speed measuring device, saving costs, but also improve the stability of the system. With computer technology and power electronics technology, high-speed microprocessors and high-speed switch for DC motor speed control as possible, breaking the previous series resistance speed DC motor and some inefficient governor's history. In this paper, the DC motor mathematical model to estimate the motor speed to overcome the traditional immunity of the speed sensor is not strong disadvantage

Keyword:  No Speed Sensor  DC Speed Control System  SCM