SUMMARY of MAGNETIC, ELECTRIC, AND INSULATION MATERIALS FOR IM

• The three main materials used to build IMs are of magnetic, electric, and insulation type.

• As the IM is an a.c. machine, reducing eddy current losses in its magnetic core is paramount.

• It is shown that these losses increase with the soft magnetic sheet thickness parallel to the external a.c. field.

• Soft magnetic materials (silicon steel) used in thin laminations (0.5 mm thick up to 200Hz) have low hysteresis and eddy current losses (about or less 2 W/kg at 1 T and 60 Hz).

• Besides losses, the B-H (magnetization) curve characterizes a soft magnetic material.

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