Study of the Electromagnetic Properties of a Soft Magnetic Composite (SMC) composed of iron particle with thin layer of phosphate coating and its efficiency when applied to a low frequency magnetic field

Abstract

This work presents the study of the preparation routes of a soft magnetic composite (SMC), its electromagnetic properties and efficiency when applied to induction motors (low frequency magnetic fields), as an alternative to traditional electric steels. Thus, different SMCs (such as pure iron powder and ASC 100.29 iron powder, both with coating and isolation of the particles with phosphoric acid) have been studied in comparison with commercialized SMCs, such as Somaloy 700 3P. In addition, methodologies for depositing the insulating layer, such as physical deposition, spraying and the Sol-Gel process were also studied. Initially, a commercial powder sample and another sample with a thin layer of phosphate were prepared. Sintered parts of these SMCs were then prepared and, subsequently, their electromagnetic parameters were acquired. From these data, an analysis of the magnetic flux in the engines built by these materials was made, in which it was observed that the sample of the composite material had properties compatible with conventional steels. It was also observed that, with the improvement of the SMC preparation routes, they can be used in the development of new engine topologies, for the most diverse applications, without loss of efficiency, mainly with regard to low frequency magnetic applications.