When starting up a BLDC motor, it is required that you know the rotor angle relative to the stator windings in order to produce torque in the correct direction. This application note provides a method for determining the rotor position of a non-moving BLDC motor. It describes both the alignment technique and the method of “exciting” the winding with known patterns and determining the rotor position by reading the currents during the excitation period which provides both the location of the iron rotor as well as the direction of the flux, thus providing position within the 60° required to produce starting torque correctly

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