OPTIMAL USE OF SOFT MAGNETIC POWDER COMPOSITES (SMC) IN ELECTRIC MACHINES

摘要

Insulated pure iron powder or so called "Soft Magnetic Composite (SMC)" is finding more use in electric motor applications especially in motors operating at high frequency with a three-dimensional magnetic flux path. With increasing values of operating frequency the use of SMC can contribute to a substantial decrease of specific core losses of the machine, increasing at the same time its total efficiency. In contrast to laminated cores, the manufacturing process of soft magnetic composites does not influence their final magnetic properties. These properties are homogenous and do not change after assembly of the motor. New SMC materials can outperform current laminated steel materials when measurements are done in the same conditions with similar samples. Many prejudices existing about the magnetic properties of SMC can thus be eliminated or attenuated if we respect its optimal use in adequate applications.