Цитата
у тех, что зовут BLDC присутствует насыщение и часть синусоиды срезается- получается подобие трапеции с экспоненциально нарастающими фронтами.
http://web.mit.edu/scolton/www/SCThG.pdfстр. 15.
Цитата
Some physical conditions that would lead to a trapezoidal back EMF are:
Concentrated windings.
No stator or magnet skew.
Discrete magnet poles with uniform magnetization.
These conditions all lead to sharp transitions in the flux linkage, which give the trapezoidal back
EMF waveform its distinct shape. While it does influence the shape of the back EMF, stator core
saturation is not the reason for the flat top of the back EMF. (Saturation implies small rate of
change of flux, so it would affect the shape near the back EMF zero crossing, not at the peaks.)