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Assessment of different cooling techniques for reduced mechanical stress in the windings of electrical machines

Bishal Silwal (UGent) , Abdalla Hussein Rashad Mohamed, Jasper Nonneman (UGent) , Michel De Paepe (UGent) and Peter Sergeant (UGent)
(2019) ENERGIES. 12(10). p.1-18
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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.
Keywords
General Computer Science, cooling methods, direct coil cooling, electrical machines, mechanical stress, temperature, thermal analysis, water jacket cooling, FAILURES

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MLA
Silwal, Bishal, et al. “Assessment of Different Cooling Techniques for Reduced Mechanical Stress in the Windings of Electrical Machines.” ENERGIES, vol. 12, no. 10, 2019, pp. 1–18, doi:10.3390/en12101967.
APA
Silwal, B., Mohamed, A. H. R., Nonneman, J., De Paepe, M., & Sergeant, P. (2019). Assessment of different cooling techniques for reduced mechanical stress in the windings of electrical machines. ENERGIES, 12(10), 1–18. https://doi.org/10.3390/en12101967
Chicago author-date
Silwal, Bishal, Abdalla Hussein Rashad Mohamed, Jasper Nonneman, Michel De Paepe, and Peter Sergeant. 2019. “Assessment of Different Cooling Techniques for Reduced Mechanical Stress in the Windings of Electrical Machines.” ENERGIES 12 (10): 1–18. https://doi.org/10.3390/en12101967.
Chicago author-date (all authors)
Silwal, Bishal, Abdalla Hussein Rashad Mohamed, Jasper Nonneman, Michel De Paepe, and Peter Sergeant. 2019. “Assessment of Different Cooling Techniques for Reduced Mechanical Stress in the Windings of Electrical Machines.” ENERGIES 12 (10): 1–18. doi:10.3390/en12101967.
Vancouver
1.
Silwal B, Mohamed AHR, Nonneman J, De Paepe M, Sergeant P. Assessment of different cooling techniques for reduced mechanical stress in the windings of electrical machines. ENERGIES. 2019;12(10):1–18.
IEEE
[1]
B. Silwal, A. H. R. Mohamed, J. Nonneman, M. De Paepe, and P. Sergeant, “Assessment of different cooling techniques for reduced mechanical stress in the windings of electrical machines,” ENERGIES, vol. 12, no. 10, pp. 1–18, 2019.
@article{8620401,
  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.}},
  articleno    = {{1967}},
  author       = {{Silwal, Bishal and Mohamed, Abdalla Hussein Rashad and Nonneman, Jasper and De Paepe, Michel and Sergeant, Peter}},
  issn         = {{1996-1073}},
  journal      = {{ENERGIES}},
  keywords     = {{General Computer Science,cooling methods,direct coil cooling,electrical machines,mechanical stress,temperature,thermal analysis,water jacket cooling,FAILURES}},
  language     = {{eng}},
  number       = {{10}},
  pages        = {{1967:1--1967:18}},
  title        = {{Assessment of different cooling techniques for reduced mechanical stress in the windings of electrical machines}},
  url          = {{http://doi.org/10.3390/en12101967}},
  volume       = {{12}},
  year         = {{2019}},
}
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