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Journal of Enhanced Heat Transfer

Impact factor: 0.400

ISSN Print: 1065-5131
ISSN Online: 1563-5074

Journal of Enhanced Heat Transfer


pages 201-213

Enhancement of Thermal Contact Conductance Between Metal Surfaces in an Induction Motor

Kenji Takahashi
Mechanical Engineering Research Laboratory, Hitachi, Ltd., 502 Kandatsu, Tsuchiura, Ibaraki, 300-0013, Japan
Heikichi Kuwahara
Mechanical Engineering Research Laboratory, Hitachi, Ltd., 502 Kandatsu, Tsuchiura, Ibaraki, 300-0013, Japan
Nobuo Kawasaki
Mechanical Engineering Research Laboratory, Hitachi, Ltd., 502 Kandatsu, Tsuchiura, Ibaraki, 300-0013, Japan
Takeshi Obata
Industrial Components and Equipment Division, Hitachi, Ltd., 7-1-1 Higashinarashino, Narashino, Chiba, 275-8611, Japan
Eiichiro Sugawa
Industrial Components and Equipment Division, Hitachi, Ltd., 7-1-1 Higashinarashino, Narashino, Chiba, 275-8611, Japan

ABSTRACT

The thermal contact conductance between an Al-alloy pipe and the stator of an actual motor squeezed into the pipe was experimentally measured. The stator had a diameter larger than the nominal diameter of the housing. When the stator diameter was 0.18 mm larger than the nominal diameter of the pipe, the thermal conductance was about 3.1 times that of an Al-alloy pipe under no pressure at the contact surface of the pipe and stator.
Plates test specimens were used to confirm the effect of thermal compound such as silicone on the thermal contact conductance. It was found that the thermal conductance increases when the thermal compound fills up the space between the two metal plates. The contact conductance between the metal surfaces with thermal compound was 3.7 to 9.4 times higher than that of a metal surface without thermal compound. Moreover, it was found that the contact conductance decreases when a PET (polyethylene terephthalate) film is used on the metal surfaces. The contact conductance of the test plates slightly decreased with an increase in the PET film thickness from 0.19 to 0.35 mm.