アルミ電解コンデンサにおけるエレメントとケース間の接触熱抵抗

抄録

Cooling performance of an aluminum electrolytic capacitor, whose element is pressed on the inner bottom surface of the capacitor housing in order to decrease thermal contact resistance between the element and the housing, was improved. It was found that a thermally conductive elastomer decreases this contact resistance. The elastomer with the thickness ranging from 0.5 to 1.5 mm was inserted between the bottom surface of the capacitor element and the plain metal surface. Experimental measurements show that the contact resistance with the 0.5 mm-thickness elastomer is smaller than that without an elastomer. A simple analysis was also developed for predicting the thermal contact resistance with different elastomer thicknesses, and these predicted resistances agree reasonably well with the experimental measurements.