APARATUS AND METHOD FOR CONTROLLING SPEED OF A SENSOLESS BLDC MOTOR

摘要

PURPOSE: An apparatus and a method for controlling speed of a sensor-less bldc motor are provided to reduce an error between a current position and an estimated position. CONSTITUTION: A motor parameter variation unit(150) varies the inductance parameter of a motor according to the size of the detected motor current by detecting the motor current. An estimated current output unit produces an estimated current of the motor based on the varied inductance parameter. A controller(170) controls the speed of the motor based on the estimated current. The motor parameter variation unit reduces one of a q-shaft and a d-shaft inductance according to the increase of a detected motor current.