Dorrell, David G.4; Hermann, Alexander Niels August1; Jensen, Bogi Bech1
1 Department of Electrical Engineering, Technical University of Denmark2 Center for Electric Power and Energy, Department of Electrical Engineering, Technical University of Denmark3 Electric power systems, Center for Electric Power and Energy, Department of Electrical Engineering, Technical University of Denmark4 University of Technology, Sydney
There has been much literature on unbalanced magnetic pull in various types of electrical machine. This can lead to bearing wear and additional vibrations in the machine. In this paper a wound rotor induction is studied. Finite element analysis studies are conducted when the rotor has 10 % rotor eccentricity. The operating conditions are varied so that transient, motoring and doubly-fed induction generator modes are studied. This allows greater understanding of the radial forces involved. Wound rotor induction machines exhibit higher unbalanced magnetic pull than cage induction machines so this is an interesting aspect of their characteristic to address.