Evaluating the Operating Characteristics of Adjustable Field Magnetization PM Motors Featuring 3D Magnetic Paths and Asymmetrically Arranged Magnets

Abstract

This paper describes a three-dimensional structure for an adjustable field magnetization permanent magnet (PM) motor. It also presents a high-power-density rotor structure with an asymmetric permanent magnet arrangement for achieving both high torque and high efficiency in the high-speed, low-torque range. 3D-FEA demonstrated that adjustable field magnetization operation is possible without sacrificing high torque density. Furthermore, load testing confirmed that high efficiency characteristics can be realized during high-speed operation.