Current limiter complicates the dynamic characteristics of servo motor

Abstract

Nowadays servo motors are widely used in many applications, such as robotic applications, home appliances, and industrial automation. The typical servo motor system that is frequently used in these applications consists of an electric motor and several cascaded control loops, which are a position control loop, a velocity control loop, and a current control loop. This chapter discusses the effects of a current controller on the dynamic characteristics of the servo motor system. The current controller regulates motor current to control motor torque and prevents overloaded motor current. It makes a servo motor easily controllable; however, it complicates some of the dynamic characteristics of the servo motor system. The chapter proposes the development of high-speed and high accuracy positioning system. The simulation results show that the performance of the modified positioning system is better than that of the previous system.