Fault Tolerant Control Strategy for Mechanical Sensor Failure of PMSM Drive Based on A MRAS-Back_EMF Observer

This paper presents a new Fault Tolerant Control (FTC) strategy for Permanent Magnet Synchronous Motor (PMSM) drive. In order to increase the reliability which is a key issue in industrial and transportation applications, two virtual sensors and a voting algorithm are combined with the actual sensor to build a fault tolerant controller. Virtual sensors is included a Model Reference Adaptive System (MRAS) estimator with stator resistance estimation and a back-emf adaptive observer. The previous methods used virtual sensor could not be used in the harsh environment which cause stator resistance variation. Analysis of the obtained results and comparisons with recent and old studies demonstrates the promising performance of this new approach

Keywords:

Permanent Magnet Synchronous Motor , Fault Tolerant Control MRAS estimator , Back-EMF observer