Stator Winding MMF Analysis for Variable Flux and Variable Magnetization Pattern PMSMs

This article analyzes the stator winding magnetomotive force (MMF) in machines to establish a general guideline for active magnetization change techniques used in variable flux permanent magnet synchronous machines and variable magnetization pattern permanent magnet synchronous machines. In this article, the spatial and time harmonics in the stator winding MMF are analyzed to build guidelines for machine topologies and the magnetizing current trajectories for the active magnetization change technique. The proposed guideline about slot pole combinations and magnetizing current pulses are verified through 11 examples from the existing literature, numerical simulation, and experiments.