FEM model of induction machine's air gap force distribution

Abstract

This paper deals with the forces acting in the air gap of an induction machine. The theoretical force distribution around the air gap is described. That is performed by the variable permeance of the magnetic circuit. Different permeance of both, the stator and the rotor slots and teeth is respected. An analytical calculation of Lorentz force acting on the rotor bars is presented. The 2D FEM model of squirrel cage induction machine is used for a calculation of the Maxwell force distribution in the air gap. That is realized by computing forces acting on the stator and the rotor teeth. The method used for the calculation is Maxwell Stress Tensor. © Springer International Publishing Switzerland 2014.