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Assessment of Different Cooling Techniques for Reduced Mechanical Stress in the Windings of Electrical Machines

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  • Bishal Silwal

    (Department of Electrical Energy, Metals, Mechanical Constructions and Systems, Ghent University, 9000 Ghent, Belgium
    EEDT-Flanders Make, The Strategic Research Center for the Manufacturing Industry, B-9052 Gent, Belgium)

  • Abdalla Hussein Mohamed

    (Department of Electrical Energy, Metals, Mechanical Constructions and Systems, Ghent University, 9000 Ghent, Belgium
    EEDT-Flanders Make, The Strategic Research Center for the Manufacturing Industry, B-9052 Gent, Belgium)

  • Jasper Nonneman

    (EEDT-Flanders Make, The Strategic Research Center for the Manufacturing Industry, B-9052 Gent, Belgium
    Department of Flow, Heat and Combustion Mechanics, Ghent University, 9000 Ghent, Belgium)

  • Michel De Paepe

    (EEDT-Flanders Make, The Strategic Research Center for the Manufacturing Industry, B-9052 Gent, Belgium
    Department of Flow, Heat and Combustion Mechanics, Ghent University, 9000 Ghent, Belgium)

  • Peter Sergeant

    (Department of Electrical Energy, Metals, Mechanical Constructions and Systems, Ghent University, 9000 Ghent, Belgium
    EEDT-Flanders Make, The Strategic Research Center for the Manufacturing Industry, B-9052 Gent, Belgium)

Abstract

Thermal loading can induce mechanical stresses in the windings of electrical machines, especially those impregnated with epoxy resins, which is mostly the case in modern traction motors. Although designers look for cooling techniques that give better performance in terms of the power density and efficiency of the machine, several thermal cycles can lead to fatigue and the degradation of the copper insulation, epoxy and consequently the windings. In this paper, the performance of different cooling techniques has been compared based on the temperature distribution and the mechanical stress induced in the windings. Three-dimensional finite element thermo-mechanical models were built to perform the study. Two different variants of water jacket cooling, two configurations of direct coil cooling and two cases of combined water jacket and direct coil cooling methods have been considered in the paper. The results show that the combined water jacket and direct coil cooling perform the best in terms of the temperature and also the mechanical stress induced in the windings. An experimental set-up is built and tested to validate the numerical results.

Suggested Citation

  • Bishal Silwal & Abdalla Hussein Mohamed & Jasper Nonneman & Michel De Paepe & Peter Sergeant, 2019. "Assessment of Different Cooling Techniques for Reduced Mechanical Stress in the Windings of Electrical Machines," Energies, MDPI, vol. 12(10), pages 1-18, May.
    • Handle: RePEc:gam:jeners:v:12:y:2019:i:10:p:1967-:d:233553
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    References listed on IDEAS

    as
    1. Bishal Silwal & Peter Sergeant, 2018. "Thermally Induced Mechanical Stress in the Stator Windings of Electrical Machines," Energies, MDPI, vol. 11(8), pages 1-18, August.
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    Cited by:

    1. Emil Cazacu & Lucian-Gabriel Petrescu & Valentin Ioniță, 2022. "Smart Predictive Maintenance Device for Critical In-Service Motors," Energies, MDPI, vol. 15(12), pages 1-16, June.

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