摘要：在永磁同步电机在变频起动时，如果不能正确的判断出电机转子d轴正方向的初始位置，就有可能会使永磁同步电机起动过程中反转，这种现象在某些应用场合是不允许出现的。介绍了一种基于码盘的永磁同步电机转子初始位置检测方法。该方法首先利用内嵌式永磁同步电机的凸极性，通过三个检测矢量来判断转子d轴的位置。然后通过已知的转子d轴位置再加入一个特定的检测矢量，根据电机的转向来判断出d轴正方向的位置。此方法可以将d轴正方向判断在30°电角度的范围内，同时实验验证了该方法的准确性和稳定性。

关键词：永磁同步电机；检测脉冲注入；初始位置检测
Abstract: If the positive direction of axis D was not correctly identified when the PMSM was started, the PMSM would be started with the wrong direction .This was not allowed in some applications. This paper introduced a method to determine initial position of the PMSM rotor. Firstly, This method firstly used for interior permanent magnet synchronous motor salient pole, to determine the d axis of the rotor position detection through three vector. And then through the known rotor d axis position and then adding a particular detection vector, according to the direction of the motor was determined by the position of the positive direction of axis d. This method can judge the positive direction of axis d in the range of 30 electrical degrees. The experimental results verify the method′s accuracy and stability.

Key words: permanent magnet synchronous motor；detection of pulse injection；initial position detecting；