电动自行车-单片机课程设计

晋小雪:电动自行车控制器的设计

摘 要

本文设计了以80C51单片机为控制器的电动自行车。设计中采用PWM技术对无刷直流电机进行调速,用开关器件——继电器控制电机停和转,并通过霍尔传感器测量转速,其转速通过八段数码管动态显示。用protel99se绘制了系统的硬件电路图。控制器与电机驱动电路用光耦完全隔离以避免干扰。控制上采用分时复用技术,实现了信号采集,电机控制和转速显示。

关键词:单片机 永磁无刷直流电动机 脉宽调制 动态显示

Abstract

The single chip microcomputer (SCM) 80C51 is used as the control center of the design of electric bicycle. The speed is regulated through Pulse Width Modulation (PWM) accordi-ng to the characteristics of permanent magnet brushless direct-current (DC) motor. The motor is controlled by a relay used as switching devices to started up and stopped. The speedis measured through a hall sensor, and then displayed dynamically in 8-led-digital tube. The hardware circuit diagram of the system is drew with the protel99se software. Controlcenter is completely isolated from motor drive circuits by an optical coupler (OC) to avoid i-nterference. Time division multiplex access (TDMA) is adoptted to control for data acq-uisition, motor control and speed display.

Keywords: SCM permanent magnet brushless DC motor PWM dynamic display

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