中文摘要：

比较全面地介绍了无刷直流电动机无位置传感器的各种控制方法,并对其进行了一定的整理和分类,从各个方法的基本原理、实现方式以及优缺点进行了比较详细的论述,最后分析了电动汽车用的驱动电机适合采用无位置传感器控制方法.

英文摘要：

Various control methods of brushless DC motors for the estimation of rotor position and speed were intro-duced and classified, and their basic principles, realization ways, advantages and disadvantages were analysed. The meth-ods suitable to be used in electric vehicles were analysed.