A nonlinear observer-based fault tolerant concept in IPMSM drive

• Published in: The XIX International Conference on Electrical Machines - ICEM 2010 pp. 1 - 6
• Main Authors: Nademi, H, Moghimian Hoosh, B, Norum, L
• Format: Conference Proceeding
• Language: English
• Published: IEEE 01.09.2010
• Subjects: Adaptive Backstepping Observer; Backstepping; Fault tolerance; Fault Tolerant Control; Fault tolerant systems; Interior Permanent-Magnet Synchronous Motor (IPMSM); Observers; Resistance; Sliding Mode Control; Stators; Torque
• ISBN: 9781424441747; 1424441749
• DOI: 10.1109/ICELMACH.2010.5607718

This paper describes new controller architecture to enhance an Interior Permanent Magnet Synchronous Motor (IPMSM) drive robust to current sensor failure. In order to increase the reliability which is crucial topic in industrial applications a virtual sensor (nonlinear observer) and a voting algorithm are combined with the actual sensors to create fault tolerant controller. It is assumed that stator resistances are unknown. An observer based on adaptive backstepping approach is used to estimate currents and stator resistance. This approach is suitable for low cost applications, where the position sensor cannot be removed to guarantee accurate position tracking, as well as back up virtual sensors in a fault resilient drive. The nonlinear observer stability study based on the Lyapunov theory guarantees the stability and convergence of the estimated quantities, if an appropriate adaptation laws are designed and persistency of excitation condition is satisfied. In our control approach, references of d-q axis currents are generated on the basis of maximum power factor per ampere control strategy related to this motor. The feasibility of the proposed scheme is shown by simulation results.