Digitally implemented naturally sampled SVM applied in speed sensor-less field oriented controlled induction motor drive

One possible implementation form of Space Vector Modulation is the Naturally Sampled (NS) one. Its favourable properties are that no distortion or delayed response are introduced by it. The aim of the paper is to introduce a digital method to implement NS SVM and compares its performance with the widely applied Regular and Doublesampled modulation form in a closed-loop speed sensor-less motor drive system. The paper focuses on the case when both the sampling over reference frequency ratio F and the carrier over reference frequency m_f is low. The investigation covers two widely applied current measurement techniques.