Amorphous metal cores in medium frequency power transformer

Razaz, M

Abstract

Theoretical designs have been carried out which demonstrate
the possible weight and volume reductions to be obtained when
using amorphous metal in place of silicon-iron for the core
material in medium frequency power transformers. The amorphous
metal provides such savings by its ability to operate at high
flux densities without excessive core losses. The reduced core
size also benefits the winding size, the overall reduction in
weight and volume is particularly appropriate for rail and air
borne power supply equipment. Of the various amorphous metal
alloys available in ribbon form, two were selected for evaluation
for the frequency band 50 to 3000 Hz. Several cores were built
suitable for use in a3 kHz 20 kVA transformer using purpose
built core winding facilities. The wound cores, after annealing,
were subjected to a comprehensive series of tests using both
sinusoidal and square wave supply voltages. The thesis contains
a valuable analysis of the results obtained and related to the
magnetic properties of amorphous metal. The effect of mechanical
stresses has also been investigated. The wound amorphous ribbon
cores were found to be slightly flexible and prone to flaking,
as a consequence several methods of core protection were
investigated. Temperature rise tests have been conducted on the
completed cores and various methods of heat dissipation tried.
The research has shown the viability of the use of amorphous
metal for the cores of medium frequency power transformers.

Citation

Razaz, M. Amorphous metal cores in medium frequency power transformer. (Thesis). University of Salford

• Thesis Type: Thesis
• Deposit Date: Aug 19, 2011
• Publicly Available Date: Aug 19, 2011
• Award Date: Jan 1, 1993