无位置传感器的BLDC控制设计与调制优化

基于无位置传感器控制设计了一种可应用于三相直流无刷电机的驱动控制器,采用反电动势法检测转子位置,梯形波驱动控制方式实现BLDC电机的启转 、运行.介绍了BLDC运行原理及实现无位置传感控制方法,探讨了如何选择最佳调制方式及电机速度最快时的换相时机,并优化了调制方法.本文设计的控制器具有启转顺 、加速快 、防输出短路等特点,适用于多种高低速 、高低电压BLDC.

Design and Modulation Optimization of Position Sensorless BLDC Control System

In the paper ,a driving controller is designed based on the position sensorless control method ,which can be applied to three-phase brushless DC motor .The rotor position is detected by back EMF method ,and the trapezoidal wave drive control mode is used to a-chieve the normal rotation of the motor .The operation principle of BLDC and how to realize the sensorless position control of the control -ler are introduced .How to select the best modulation mode and the commutation time of the fastest speed of the motor are discussed , then optimizes the modulation method .The controller designed in this paper has the advantages of smooth start ,fast acceleration and out-put short-circuit prevention ,it can be applied to various BLDC motors .