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Samples in periodicals archive:
The family features an embedded motor-control cell, which includes six-phase Pulse-Width Modulation (PWM) control, voltage or current sensing and a highly flexible Back Electromotive Force (BEMF) detector for the sensorless control of permanent-magnet BLDC motors.
Patent #8358093B2 - Sample and hold time stamp for sensing zero crossing of a back electromotive force in 3-phase brushless DC motors.
This generates a back electromotive force (voltage) to oppose the change in current, which creates a transient.