Performance Comparison between Adjustable Field IPM Motor Based on Permeability Modulation Technique and Conventional IPM Motor

A proposed adjustable field interior permanent magnet (IPM) motor based on a permeability modulation technique was discussed in this paper. The permeability modulation technique can modulate the permeability of a magnetic material using magnetic saturation with the special magnetic flux. The proposed IPM motor can control an amount of PM flux which interlinks to the stator windings modulating the permeability of the leakage magnetic paths. In this paper, it was confirmed that the proposed IPM motor has superiority of the driving range, the copper loss when driving at the high-speed, and torque ripple over the conventional IPM motor through the several electromagnetic field analyses.