Design of five-phase ferrite magnet assisted synchronous reluctance motor using lumped parameter model based optimizer and FEA

This paper proposes an efficient and reliable five-phase ferrite magnet assisted synchronous reluctance motor (Fa-SynRM) which exhibits comparable performance to a five-phase rare-earth permanent magnet based PMa-SynRM. Five-phase PMa-SynRM offers higher reliability and lower torque ripple compared to conventional three phase PMa-SynRMs, and low-cost ferrite magnet potentially decrease the manufacturing cost. However, lower strength of ferrite magnets require more magnet composition and increase stress towards the edges of flux barriers. Demagnetization of ferrite magnets is another factor to be considered in designing the Fa-SynRM. Initially, to develop an optimal and sustainable design, a lumped parameter model (LPM) based optimizer and a finite element model (FEA) has been used to extract an optimal model. The designs are further optimized to reduce the cost and develop more robust models to stress and demagnetization. Finally, the performance and cost of the developed models have been compared to those of benchmark model and initial LPM model.