Abstract
In recent years, research has focused on fractional slot permanent magnet brushless machines with
concentrated non-overlapping windings. Because of their high torque density, high efficiency, low torque
ripple, excellent flux-weakening, and fault-tolerance characteristics, they have already been used in
commercial HEVs. However, when an inside PM rotor is used, the reluctance torque component is generally
low or even insignificant, and such machines show comparatively high rotor eddy current loss, possibly large
unbalanced magnetic force, acoustic noise, and vibration owing to rich mmf harmonics. Their many
structural and design elements for EV/HEV applications are collected in this study.
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