Abstract
This paper presents a stable motor speed control system in low speed region with a low resolution shaft encoder. The proposed control system has the models of the controller and the motor to estimate the rotor speed. The estimation of speed is performed by correcting the estimated position, speed and the integration term of controller in accordance with the position estimation error between the detected and estimated positions. The stability of the proposed control system and the design of the estimation gains are examined.
The proposed algorithm was verified by using a 4-pole, 2.2kW test motor drive system with a 256 pulse/rev encoder. In the experimental results, the stable speed control for the reference speed of 20 rpm was realized. The proposed algorithm was also stable against the step change of the disturbance torque.
