Three phase BLDC motor controller and control method thereof

摘要

A method of controlling a three-phase brushless direct current (BLDC) motor, including (a) arranging a rotor of the three-phase BLDC motor by making a current flow to two of the three phases; (b) rotating the rotor through a phase shift; (c) detecting a position detecting point of time where a sign of an inductive electromotive voltage generated by a rotation of the rotor in a non-exciting phase is initially changed; and (d) calculating a rotation speed of the rotor based on a size of the inductive electromotive voltage of the non-exciting phase detected at the position detecting point of time. Thus, provided is a brushless direct current (BLDC) motor controller and a control method thereof which precisely detects a position detecting point of time of a rotor to determine a rotation speed of a rotor and minimizes noise and vibration during an initial drive of the three-phase BLDC motor.