Abstract
Permanent Magnet Synchronous Motors (PMSM) are widely utilized today. Usually, they are designed so that they may induce the sinusoidal electro motive force(emf) because of necessity to suppress torque ripples when they have been driven by sinusoidal control currents. Thus, the measures for using the magnets are restricted. In this paper, a broadened magnet type interior PMSM which induce the non-sinusoidal emf is proposed. Maximizing of torque, minimizing of copper losses and torque rippleless are taken into considerationand the best suitable current form is calculated. Performance of IPMSM in this case compared with that of ordinal sinusoidal emf type IPMSM driven by sinusoidal current through the calculation. We found that the torque increased from 14.6% to 16.8% while width of magnet had been increased by 20.5%.
