USB迷你可调速风扇的设计.doc

广州大学松田学院 毕业论文（设计） 题 目 USB迷你可调速风扇设计 二○一三 年 六 月 USB迷你可调速风扇设计 摘要：在这几年来，直流驱动控制作为电气传动的核心在现代化生产和生活需求中显得越来越重要。一直以来，由于直流电机具有调速性能好、起动和制动转矩大、易于控制和可靠性较高等特点，因其长期以来在电气传动领域中占有重要位置。它在直流电动工具、机械和家电设备中广泛应用，尤其在风扇方面，随着全球气温的升高，在现代化生产机械、家用电器及电脑对风扇的需求越来越强烈，这对提高风扇性能的要求越来越高。因此，设计USB迷你可调速风扇起着举足轻重的作用。 本设计是以单片机为核心的PWM占空比输出的直流调速系统的风扇，其特点是用单片机代替速度调节器、电流调节器及模拟触发器等硬件设备。由USB接口对整个模块提供电源，从而实现系统的多级调速，其大部分是由键盘输入信号传给单片机，此时主要由数码管显示，单片机进行逻辑判断和复杂运算后，输出PWM信号控制于直流电机转速，使用红外对管进行黑白信号检测来反馈电机的运转速速。其中，通过USB接口统一给电机（电扇）提供电源。程序是使用C语言来编写的，实验结果显示，0到100r/min是理想的调速范围。 关键词：直流电机，直流调速，单片机，PWM,USB USB Mini speed-adjustable fan design Abstract: In recent years, DC-driving control as the core of electric drive in modern production and living needs more and more important .because DC motor has good speed performance, starting and braking torque, easy control and reliability higher characteristic ,so it is long time in the field of electric drive occupies an important position .it is widely used in the DC electric tools, mechanical and electrical equipment ,especially in term of fan. As global temperatures rise, the modernization of production machinery ,household appliances and computer more and more demand for fan, the fan performance is required more and more high .Therefore ,the design of USB Mini adjustable speed fan play a decisive role. The design is based on single-chip microcomputer as the core of the PWM duty ratio fan speed control system of DC output ,features is used instead of the speed regulator and analog trigger hardware .The whole module is powered by USB interface ,multistage speed so as to achieve system ,most of them are from the keyboard input signal to the single-chip ,then it is mainly composed of digital tube display ,after single-chip micro-computer for logic and complex operation ,the output PWM signal controls the speed of DC motor, it is used of infrared black-and-white signal detection of pipe to feedback the motor running quickly, among them, through the USB interface