A method to evaluate effects of eccentricity and anisotropy on iron losses of electrical machines. Application to an induction motor

Abstract

Effects of eccentricity and magnetic anisotropy on total and local iron losses in electrical machines are investigated. The method used combines a finite element simulation and a dynamic hysteresis modelling. The study is performed on a 4 kW induction motor. Eccentricity is shown to have influence only on the local loss distribution and not on the global losses. On the contrary, magnetic anisotropy appears to increase losses remarkably. Different prototypes are designed to compare simulations with experiments. While eccentricity results are very satisfying, anisotropy effects are hard to quantify experimentally and necessitate further investigations.