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Effect and analysis of induced thermal stresses in a plotted cylindrical inductor
Author(s) -
Vlastaras A. S.
Publication year - 1972
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.1972.070160612
Subject(s) - inductance , materials science , epoxy , inductor , drop (telecommunication) , curing (chemistry) , composite material , thermal , polymer , ferrite (magnet) , thermodynamics , electrical engineering , voltage , engineering , physics
Thermal stresses developed during the cooling of a cured potted inductor from higher processing temperatures, resulting from the difference in the thermal expansion coefficients of the ferrite core and the epoxy polymer, cause a drop in inductance. The inductance drop was followed with time and temperature under various conditions. An attempt is made to explain the inductance drop based on experimental observations and theoretical considerations. A mathematical model was constructed to aid the thermal stress analysis at the ferrite core–polymer interface. It is shown that lower‐temperature epoxy curing results in greater stresses (inductance drop) than higher‐temperature curing.