Analytical modeling-based optimal design of multilayered and multisegmented D-type interior permanent magnet synchronous motor

Abstract

In this paper, an interior permanent magnet synchronous motor with a D-type rotor configuration is presented. The performance of the proposed motor is compared with that of the widely used V-type interior permanent magnet synchronous motor. For a fair comparison, all the motor parameters are identical. With the advent of different rotor topologies, multilayered and multisegmented permanent magnets are extensively used; however, an analytical modeling of D-type interior permanent magnet synchronous motor has not yet been conducted. Furthermore, its analysis using the finite element method is considerably time-consuming. To resolve this problem, an analytical method based on a magnetic equivalent circuit is proposed for the slotless D-type interior permanent magnet synchronous motor. It is then compared with the finite element method at different pole arc–pole pitch ratios to demonstrate the effectiveness of the proposed method. Additionally, Schwarz-Christoffel mapping is employed to maintain the slot shape and include the effect of adjacent slots by considering the slotting effect in the slotless air-gap flux density. Finally, the presented motors are optimized based on the pole arc–pole pitch ratio to maximize the fundamental air-gap flux density and minimize the total harmonic distortion. © 2021 John Wiley & Sons Ltd.