A novel multiphase fault tolerant high torque density permanent magnet motor drive for traction application

This paper presents a novel five-phase fault tolerant permanent magnet motor drive with higher performance and reliability for use in safety-critical applications. A new machine design is developed for fault tolerant operation without severely comprising the drive performance. Fault tolerance is achieved by employing a new fractional-slot concentrated windings configuration PM motor drive, with each phase electrically, magnetically, thermally and physically independent of all others. The proposed motor drive system poses with higher torque density, negligible cogging torque, and less than plusmn0.5% torque ripple. Power converter requirement are discussed and control strategies to minimize the impact of a machine or converter fault are developed. Beside, all the requirement of a fault tolerant operation, including high phase inductance and negligible mutual coupling between phases are met. Analytical and finite element analysis and comparison case studies are presented