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Detecting the backward EMF

A very popular method of detecting the rotor position is the monitoring of the EMF. If the motor is fed with $120^\circ$ voltage blocks, there are $60^\circ$ intervals when each phase leads no current. During this interval the EMF in the related phase crosses zero. This zero crossing can be detect to determine the rotor position [6].

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Volker Bosch 2015-05-27