Temperature-dependent modelling of magnetic ageing of FeSi electrical steels

This paper deals with the temperature-dependent modelling of iron losses in context magnetic ageing electricals steel used high power electrical machines. First, two sheet grades were heat treated at three temperatures order to study effect evolution as a function temperature. Results show significant increase for both grades. Then, considering link between macroscopic properties (effect) and microscopic precipitation (cause), Johnson – Mehl Avrami Kolmogorov (JMAK) law describing kinetics was applied model time ageing. By coupling this Arrhenius’ law, is developed be able predict several temperature levels.