A line-to-line voltage zero-crossing comparison method is presented for sensorless brushless DC motor( BLDCM), compared to the BLDCM control method using hall position sensor, has an in-depth study of the relationship about commutation signals, commutation logic and running direction. The logic expressions of com mutation signals producing by two methods respectively are given, the only commutation logic which makes sen sorless BLDCM running with line-to-line voltage zero-crossing comparison method is derived, the connection re lationship between inverter and the three-phase windings which makes effects on the motor running is researched. The experimental result shows that the conclusions are correct, practical and valuable in engineering.%针对无位置传感器的无刷直流电动机(BLDCM),介绍了一种线电压过零比较法,与有霍尔位置传感器的BLDCM控制相比较,深入研究了换相信号、换相逻辑及电机转向之间的关系.给出了两种控制方法换相信号之间的逻辑关系表达式,推导出了用线电压过零比较法实现BLDCM无位置传感器运行的唯一换相逻辑,研究了逆变桥与三相绕组之间的连接方式对电机运行的影响.实验结果证明,研究结论正确,实用性强,具有较高的工程应用价值.
展开▼
