Finite Element Analysis of Flux-Switching PM Machine Considering Oversaturation and Irreversible Demagnetization

摘要

A typical 12/10 flux-switching permanent magnet (PM) machine is analyzed using finite-element (FE) method with special considerations of the silicon steel oversaturation, PM irreversible demagnetization, and the dc-biased magnetic induction on the hysteresis loss. The high flux density range of curve which is difficult to measure is deduced with the combination of polynomial extrapolation and silicon steel saturation magnetization. A temperature-dependent sloped linear PM demagnetization model is incorporated into the FE model to analyze PM irreversible demagnetization and estimate the maximum allowable working temperature for PM. The influence of dc-biased magnetic induction on hysteresis loss is taken into account in core loss calculation. The FE analysis package is developed with the help of FE program generator.