Investigation and Modeling of Local Degradation in Soft Magnetic Materials

Manufacturing processes such as cutting, welding or assembling introduce local mechanical and thermal stress to the material that results in a decrease of magnetic permeability and an increase of hysteresis losses. Therefore, the adoption of catalogue data for electrical machines simulation leads to a low accuracy of the results. This paper deals with effective modeling the degradation of relative permeability and iron losses in soft magnetic materials due to manufacturing processes. The degradation profile is assessed by means of experimental activity conducted on a set of ring samples where the damaged material has been removed through electrical discharge machining. The proposed modeling approach is particularly relevant when it is implemented in numerical simulation tools.

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