Three-phase brushless DC motor driving circuits and methods using one hall signal

摘要: A three-phase brushless dc motor driving circuit can use only one Hall signal. The magnitude and phase of the signal is used for commutation in order to perform soft switching, an index marker determine starting point rotation. clock output at extreme points generated by sensor. Based on signal, three step voltage signals are generated, each having levels, periods times that 120 240 degree differences with other two signals. direction current flow stator coil controlled based difference Index detection performed demagnetizing a portion magnet rotor using additional resulting marker.