Influence of Insulation Thermal Aging on the Temperature Assessment in Electrical Machines

Vincenzo Madonna, Paolo Giangrande, Michael Galea

Research output: Journal PublicationArticlepeer-review

5 Citations (Scopus)

Abstract

Thermal modeling and temperature assessment of electrical machines often rely on the use of lumped-parameter thermal networks. A historic limitation of analytical thermal models is their need for an experimental fine-tuning, necessary for selecting the appropriate values of thermal conductivity and convection heat transfer coefficients. This evaluation procedure is commonly carried out at the design stage of a new machine, by assuming that its thermal behavior will remain unchanged throughout its whole lifetime. This paper demonstrates, through an in-depth experimental investigation, how the capability of heat extraction from a machine's hot spot towards the coolant can be strongly affected by the level of thermal aging of its insulation system. Based on the experimental findings, a decrement of the winding equivalent thermal conductivity is noted as the thermal aging accumulates, with a corresponding progressive increment in hot-spot temperature.

Original languageEnglish
Article number9112655
Pages (from-to)456-467
Number of pages12
JournalIEEE Transactions on Energy Conversion
Volume36
Issue number1
DOIs
Publication statusPublished - Mar 2021
Externally publishedYes

Keywords

  • LPTN
  • Thermal analysis
  • aging
  • design of experiments
  • electrical machines
  • physics of failure

ASJC Scopus subject areas

  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering

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