Abstract
Recently, there’s been a growing trend toward a low carbon society from rise on the interest of the environment. In the automotive industry, environmentally-friendly vehicles, like hybrid electric vehicles and plug-in hybrid electric vehicles, are replacing petrol vehicles. Due to this trend, the demand of power supply devices, such as converters, increase more and more. And there devices are required good conversion efficiency and downsizing. Therefore, these devices require the soft magnetic materials which have excellent alternative current (AC) magnetic property.The authors have developed the soft magnetic powder cores which are made by compacting soft magnetic powder coated with the insulation film and then heat-treating to remove the compacting strain. The cores have high performance of AC magnetic property, low iron loss and high flux density. In this study, the effect of particle size distribution on the permeability at a high magnetic field and iron loss of FeSiAl alloy soft magnetic powder core was reported from the view point of demagnetizing coefficient.
