Electromagnetic Analysis and Steady-State Performance of Double-Sided Flat Linear Motor Using Soft Magnetic Composite

The applicability of a soft magnetic composite (SMC) material to a new double-sided buried-type interior permanent-magnet flat linear brushless motor (IPM-FLBM) with slot-phase shift is presented through the steady-state performance improvement in this paper. The IPM-FLBM using a conventional electrical solid steel is used as a base model prototype for the performance comparison. The analytic models for armature resistance, inductances of series-connected asymmetric dual three-phase windings, no-load flux linkages, and back electromotive forces (back EMFs) are investigated to derive a closed-form equation for the thrust force. The magnetic field capability due to the design parameter changes of the new SMC prototype is analyzed using two simplified nonlinear magnetic equivalent circuit (MEC) models, comparing with the base model prototype. The iron and copper losses of the SMC prototype also are investigated in terms of the thermal limitation. The steady-state performance enhanced by the reduced air-gap size is experimentally validated through the comparison of the static thrust force with that of the base model prototype.