Patent ID: 7102309

Claim:
An apparatus for compensating for a speed error of a motor, comprising: a speed compensator that divides a rotational section corresponding to one complete revolution of a rotor of the motor into a plurality of preset divided rotational sections, compares a reference speed of the motor with a previous estimated speed in each divided rotational section, calculates the speed error of the motor according to a result of the comparison between the reference speed of the motor and the previous estimated speed in each divided rotational section, and determines a speed compensation value for compensating for the speed error; a comparator that compares the speed compensation value, the reference speed and a current estimated speed of the motor; and a proportional integration controller that outputs a reference torque component current for compensating for the speed error of the motor according to the result of the comparison between the speed compensation value, the reference speed and the current estimated speed of the motor.