Determination of Losses in Steel of an Induction Motor at Its Deep Saturation

Abstract

The paper shows that the existing methods for determining steel losses of an induction machine are suitable only for the initial rectilinear (unsaturated) section of the magnetization curve, which gives a significant error in the saturation mode, or contain a large number of unknown elements, which makes it cumbersome and difficult to use the results in practical purposes. The proposed method is a further development of the well-known approach to determining steel losses. This takes into account the change in the magnetization inductance. This allows it to be used in high saturation mode. The expressions for determining steel losses are presented as a function of magnetic flux, EMF and current, which makes them suitable for practical use.