Torque and core loss characterization of a variable-flux permanent-magnet machine

Abstract

An appropriate torque-angle selection can improve the torque-to-current ratio of a machine, the size of the converter, and provide an optimal operation of the motor. An accurate determination of the core loss will lead to a better machine design and efficiency estimation. This paper presents the torque-angle and core loss characterization of a variable-flux permanent-magnet machine. Torque-angle curves and core losses are measured and simulated for a 7.5 hp variable-flux machine. The core losses are also obtained using an analytical method. The experimental results for torque-angle and core losses are found to be in good agreement with the simulations and the core losses are also in correlation with analytical data.