Some notes on temperature rise armature in traction motor. (I) On revaluation of heat transfer coefficient and estimating of air flow characteristic through air-holes

Yukio Kawakami, Hiroshi Mutoh

Research output: Contribution to journalArticle


In estimating heat transfer in a traction motor, consideration must be given to a rise in air temperature. The authors investigated air flow characteristic with dummy rotors simulating an armature core in which the prototype motor output is 230[kW]. Air hole diameter, hole number, and rotor speed have little effect on pressure loss coefficient. The pressure loss coefficient is ζ = 49Re-0.3 for Reynolds numbers ranging from 104 to 2 × 105.

Original languageEnglish
Pages (from-to)54-63
Number of pages10
JournalWaseda Daigaku Rikogaku Kenkyusho Hokoku/Bulletin of Science and Engineering Research Laboratory, Waseda University
Issue number120
Publication statusPublished - 1988 Dec 1


ASJC Scopus subject areas

  • Engineering(all)

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