基于单片机的无刷直流电动机脉宽调速系统

PWM speed adjustment system of brushless DC motor based on single-chip microcomputer

针对以往无刷直流电动机多由单片机附加许多种接口设备构成,难于实现从位置环到速度、电流环的全数字控制问题,设计了采用SPCE061A型16位单片机的脉宽调速系统.该单片机主要完成位置传感器信号的采集、电动机换相信号的输出、电动机转速的测量以及数字PWM调速信号的输出等功能.电动机驱动电路采用开关速度快、功耗低的MOSFET管全桥方式.实验证明,该系统响应速度快,动静态特性良好,适用于对小功率无刷直流电动机的速度调节.

BLDC motor is usually composed of many additional IO devices and is hard to achieve fully digital control from position loop to speed loop and current loop. In order to solve the above problems, the PWM speed adjustment system using 16-bit SPCE061A single-chip microcomputer was can complete such functions as the acquisition of position sensor signal, output of motor commutation signal, measurement of motor speed and output of digital PWM signal. The motor drive circuit adopted the MOSFET full-bridge mode with fast switching and low power consumption. The experimental results demonstrate that the system has quick response, good dynamic and static characteristics, and is suitable for the speed-adjustment of small power brushless DC motor.