Accession Number:

ADA159439

Title:

Production and Performance of Metal Foil Brushes,

Descriptive Note:

Corporate Author:

VIRGINIA UNIV CHARLOTTESVILLE DEPT OF MATERIALS SCIENCE

Report Date:

1981-01-01

Pagination or Media Count:

22.0

Abstract:

Electrical brushes which were made of silver, copper and aluminum foils of 12.5 and 25 micrometer thickness and were composed of 15 - 195 individual foils, were tested in purified argon on a polished copper rotor at a speed of a 13 ms. Brush pressures varied between 3,100 and 28,000 N sq m and current densities were up to about 700 Asq cm about 4500 Asq in. The observed dependence of the voltage drop across the brushes as a function of the current densities agreed closely with Holms contact theory as applied to foil brushes. The film resistivities were found to be near sigma F 10 to the -12th power ohmssq m for copper and silver and to be about 3 x 10 to the 12th power ohmssq m for aluminum. The projected performance of foil brushes based on these results is very favorable and the future commercial use of foil brushes appears to be possible.

Subject Categories:

  • Electrical and Electronic Equipment

Distribution Statement:

APPROVED FOR PUBLIC RELEASE