Title :
Evaluation of interlaminar eddy currents in induction machines
Author :
Handgruber, Paul ; Stermecki, Andrej ; Biro, O. ; Ofnery, Georg
Author_Institution :
Inst. of Fundamentals & Theor. in Electr. Eng. (IGTE), Graz Univ. of Technol., Graz, Austria
Abstract :
A novel three-dimensional eddy current model to account for the additional losses caused by interlaminar short circuits is presented and applied to the loss estimation of an induction machine. The method is based on a single sheet model with appropriate boundary conditions on the interlaminar contact surface avoiding cumbersome full three-dimensional models with multiple short circuited laminations. The interlaminar model is validated by means of full models comprising several interconnected sheets and used for the quantification of extra losses caused by conductive joints and shearing burrs. It has been found that particularly burrs occurring on the tooth edges lead to a significant loss increase.
Keywords :
asynchronous machines; eddy current losses; laminations; short-circuit currents; boundary conditions; conductive joints; full three-dimensional models; induction machines; interconnected sheets; interlaminar contact surface; interlaminar eddy current evaluation; interlaminar short circuit current; loss estimation; multiple short circuited laminations; shearing burrs; single sheet model; three-dimensional eddy current model; Boundary conditions; Computational modeling; Eddy currents; Integrated circuit modeling; Lamination; Solid modeling; Stators; AC-machines; eddy currents; electric machines; electromagnetic analysis; finite element analysis; joining processes; magnetic cores; manufacturing processes; rotating machines; short circuit currents;
Conference_Titel :
Industrial Electronics Society, IECON 2013 - 39th Annual Conference of the IEEE
Conference_Location :
Vienna
DOI :
10.1109/IECON.2013.6699573
