中文摘要：

在具有凸极结构转子的无刷直流电机中，受转子凸极效应的影响，绕组的自感和互感随转子位置呈近似正弦的周期性变化，导致三相端电压在非导通期间的波形随转子位置呈现有规律变化。该文以此出发，分析了非导通相的端点电压在PWM斩波周期内的跳变值随转子位置的变化规律，并阐述了利用此规律进行运行状态下换相位置估计的方法，并与铁心的饱和效应相结合，提出一种新的在静止状态下进行转子位置区间估计的方法。实验结果表明，用所提出的方法能在静止和低速状态下可靠地估算出转子位置，与实际的误差很小，验证了方法的可行性。

英文摘要：

In brushless DC motors （BLDCM） with a saliency pole structured rotor, influenced by saliency effects, the self-inductance and mutual-inductance present periodicity sinusoidal variations, which results in the regular changes of terminal voltage waves of three phases during the unexcited period. Starting from this feature, the paper analyzed the variation behavior of the terminal voltages of the unexcited phase in each PWM chopping period, and expounded the estimation of commutation position at the running state using the character. Combined the method with saturation effects of the iron core, the paper raised a new method of rotor position interval estimation at the stationary state. Experimental results show that the method can reliably estimate the rotor position at the running and stationary state with a small error.