to dc motor drive speed regulation in a
flatbed scanner to reject the motor cogging
torque. A discrete time prototype repetitive
controller was designed and integrated into an existing feedback
loop using the plug-in concept to reject the periodic
cogging torque under a constant reference speed. System
identification was conducted to obtain the repetitive control
plant model. With the augmented repetitive controller, the
periodic speed error was attenuated by approximately 75%.
Also, a robustness criterion was developed to guarantee successful
implementation on real systems.