Nonlinear Modeling of Air-Gap Flux Density Distribution in a Synchronous Machine with Magnetic Saturation in the Iron Core Teeth

Abstract

A nonlinear model is proposed representing air-gap magnetic flux density distribution in a synchronous machine with magnetic saturation in the teeth of rotor and stator. To consider saturation of teeth of iron core, the authors assume that saturatable part is distributing around air-gap. A model to express air-gap flux is derived from magnetic circuit inside of the synchronous machine. The co-saturation function is decided from the no-load saturation curve. The calculated air-gap magnetic flux distribution by this saturation model is compared with that of measured at the on-load test. As a result, the calculated air-gap magnetic flux distribution from the proposed saturation model agrees well to measured one.