Development of High-Performance P/M Soft Magnetic Material

Abstract

Conventional soft magnetic materials used for various applications such as high-speed rotary motors were made by laminated steels. However, when these materials were used at high frequencies (1 kHz or higher), there was a decline in the magnetic properties caused by the core loss (heat generation by eddy current).To solve these problems, we developed new soft magnetic materials made of fine magnetic iron powder coated with an insulating layer, to which ultra-trace volume of heat-resistant binder is added with high density, thus obtaining superior magnetic properties using the powder metallurgy (P/M) method.This paper discussed on the DC and AC magnetic properties and the mechanical properties of newly developed P/M soft magnetic materials.