Title :
Three-Dimensional Eddy Current Loss Modeling in Steel Laminations of Skewed Induction Machines
Author :
Handgruber, Paul ; Stermecki, Andrej ; Biaro, O. ; Ofner, Georg
Author_Institution :
Christian Doppler Lab. for Multiphysical Simulation, Graz Univ. of Technol., Graz, Austria
Abstract :
The effects of skewing on the loss behavior of a megawatt rated slip-ring induction machine are studied. The iron loss evaluation is performed by postprocessing the field solution obtained from a multi-slice finite element model. A novel method to compute the three-dimensional eddy current distribution in the steel sheets is employed for the eddy current analysis. The iron loss models are validated against no-load iron loss measurements. Simulation results under load show that skewing leads to a highly non-uniform iron loss distribution along the machine length. The sum of the iron and copper losses increases slightly compared to a machine with straight rotor bars.
Keywords :
asynchronous machines; bars; eddy current losses; eddy currents; finite element analysis; laminations; loss measurement; rotors; steel; megawatt rated slip-ring induction machine; multislice finite element model; no-load iron loss measurements; skewed induction machines; steel laminations; steel sheets; straight rotor bars; three-dimensional eddy current loss modeling; Eddy currents; electric machines; finite element methods; magnetic losses;
Journal_Title :
Magnetics, IEEE Transactions on
DOI :
10.1109/TMAG.2012.2236644