Comparative Study of Half-Wave Rectified Excitation PM motors with Different Hybridization Ratios for Variable Speed Drive

Abstract

In this study, we compare three designs of half-wave rectified excitation PM motors, possibly for use in variable speed drive applications. Each proposed motor has a different ratio of permanent magnet excitation to total field excitation (hybridization ratio). The hybridization ratios are selected based on the dominance of magnetic flux contribution to the air-gap by the permanent magnet or field winding excitation. In order to investigate the effect of hybridization ratio on motor performance, a comparison study has been conducted at base speed, low-speed and high-speed region. The comparison is performed using the finite element method.