Thermally Induced Mechanical Stress in the Stator Windings of Electrical Machines

Bishal Silwal and Peter Sergeant
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Bishal Silwal: Department of Electrical Energy, Metals, Mechanical Constructions and Systems, Ghent University, Ghent 9000, Belgium
Peter Sergeant: Department of Electrical Energy, Metals, Mechanical Constructions and Systems, Ghent University, Ghent 9000, Belgium

Energies, 2018, vol. 11, issue 8, 1-18

Abstract: The lifetime of an electrical machine mainly depends on the thermal overloading. Modern day applications of electrical machines on one hand require compact machines with high power density, while on the other hand force electrical machines to undergo frequent temperature cycling. Until recently, in the case of electrical machines, the main factor related to the degradation of the winding insulation was thought to be the thermal oxidization of the insulation materials. It has now been revealed that thermal overloading can also induce mechanical stress in the windings of electrical machines, which over time could lead to fatigue and degradation. In this paper, a comprehensive study of the thermally induced mechanical stress in the windings of an electrical machine is presented. The study is performed using combined thermo-mechanical models. The numerical results are validated by experiments on a segmented stator winding set-up.

Keywords: electrical machines; mechanical stress; stress; switched reluctance machines; temperature; thermal analysis (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2018
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (3)

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