SYSTEM AND METHOD FOR MOTOR SPEED CONTROL IN THE LOW SPEED REGION

摘要

PURPOSE: A system and a method for controlling a motor speed in a low speed region are provided to obtain a fast dynamic property according to a change of a speed command by applying a PID(Proportional Integral Derivative) gain of a speed controller according to a speed in a low speed region. CONSTITUTION: A system(100) for controlling a motor speed includes a measuring part(110), a phase selection part(120), and a control part(130). The measuring part measures a time delay within a speed control loop and a bandwidth of a speed controller(12) in a low speed region of a motor. The phase selection part sets a closed loop pole according to a speed of the motor. The phase selection part selects a phase in the closed loop pole. The control part determines selection of a PID gain of the speed controller for compensation of the closed loop pole according to a phase condition and a position change of the closed loop pole. In case the PID gain of the speed controller is selected, the control part performs a gain control of the speed controller through the PID gain of the speed controller according to a speed change of the motor.