Fractional Slot Permanent Magnet Brushless Machines and Drives for Electric and Hybrid Propulsion Systems
Fractional slot permanent magnet brushless machines having concentrated nonoverlapping windings have been the subject of research over last few years. They have already been employed in the commercial HEVs due to high torque density, high efficiency, low torque ripple, good flux-weakening and fault-tolerance performance. However, due to rich mmf harmonics, such machines exhibit relatively high rotor eddy current loss, potentially high unbalanced magnetic force and acoustic noise and vibration, while the reluctance torque component is relatively low or even negligible when an interior PM rotor is employed. This paper summarizes their various structural and design features for EV/HEV applications.
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