Impact of Electric Field on Magnetic Flux Distribution in Electrical Machines with Very Large Size

The dielectric property of magnetic components was first widely discussed in microwave ferrite applications. In recent years, due to the increasing frequency and voltage level of power electronic applications, the dielectric properties of high-power magnetic components have gradually begun to attract attention. The purpose of this paper is to extend the research on the dielectric properties of magnetic components with low frequency (50-60 Hz) and very high power applications e.g. hydro-generators. It is worth noting that even for low frequency applications, the filed space harmonics can have frequencies of several kilohertz. Due to the laminated structure of electric machines, a complete, physical, FEM finite element simulation of a large machine is very costly. Therefore, this paper begins with the effective medium approximation method, which is used to calculate the material parameters of the laminated structure and then transforms these material parameters into the simulation model of an electric machine with a very large size.