Experimental Characterization and Modeling of Thermal Resistance of Electric Machine Lamination Stacks

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15 Scopus Citations

Abstract

There is lack of information in the open literature on thermal properties of electric machine lamination stacks such as contact resistance and effective thermal conductivity, yet this information is critical for researchers and engineers in electric machine design and development. The thermal conductivity of electromagnetic steel lamination materials was measured, and the thermal contact resistance between laminations in a stack, as well as factors affecting contact resistance between laminations - such as the contact pressure and surface finish – were investigated. A model was also developed to estimate the through-stack thermal conductivity for materials beyond those that were directly tested in this work. Four lamination materials were investigated, including the commonly-used 26-gauge and 29-gauge M19 materials, the HF10, and Arnon 7 materials. Although this paper focuses on electric machines for automotive applications, the information is potentially applicable to any component utilizing electromagnetic steel laminations.

Original languageAmerican English
Pages (from-to)152-159
Number of pages8
JournalInternational Journal of Heat and Mass Transfer
Volume129
DOIs
StatePublished - Feb 2019

Bibliographical note

Publisher Copyright:
© 2018

NREL Publication Number

  • NREL/JA-5400-72397

Keywords

  • Electric machine
  • Energy efficiency
  • Stator
  • Steel lamination
  • Thermal conductivity
  • Thermal contact resistance

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