Interior permanent magnet synchronous motor design for improving self-sensing performance at very low speed

The focus of this paper is to improve self-sensing performance of interior permanent magnet synchronous machine (IPMSM) by modifying rotor configurations. Field intensified IPMSM (FIIPMSM) is designed by adding flux barriers in the rotor of an IPMSM. In comparison with IPMSMs, FIIPMSMs have the advantage of decoupling saturation-induced saliency, cross-coupling effects and also secondary saliencies, which reduce the estimation accuracy of self-sensing control for IPMSMs. Finite element analysis (FEA) is used to design the FIIPMSM and assess the performance of machine for self-sensing. Self-sensing capabilities of IPMSMs and FIIPMSMs are presented and compared. The results demonstrate the improved self-sensing performance of the new field intensified machine.