Analysis of magnetic properties degradation following industrial impregnation process of electrical steel laminations

This paper deals with the analysis of the magnetic properties degradation following an industrial impregnation process of electrical steels employed in stators of large generators. First, the impregnation process is studied directly on industrial stators to emphasize the significance of the process effect. Then, to have a controlled approach of the impregnation conditions, laminated ring cores were subjected to the same process but for different configurations. The ring cores were magnetically characterized to highlight the influence of the resin on the magnetic properties. Also, in order to distinguish the effect of the resin from potential other phenomena during the curing phase (i.e. the ageing effect), an experimental protocol is proposed: the results allow to emphasize the impact of such process on the magnetic properties.

Automated summary

This paper investigates the degradation of magnetic properties in electrical steels used in stators of large generators following an industrial impregnation process. The study first focuses on the impregnation process on industrial stators to highlight its significance. Laminated ring cores are then subjected to the same process under different configurations to control the impregnation conditions. The magnetic characterization of the ring cores reveals the influence of resin on the magnetic properties. Additionally, an experimental protocol is proposed to distinguish the resin effect from other potential phenomena during the curing phase, and the results emphasize the impact of the process on the magnetic properties.