Servo state feedback based on Coefficient Diagram Method in magnetic levitation system with feedback linearization

The challenge design of servo state feedback controller is how to determine the parameter value of integral gain and state feedback gains. This paper proposes CDM (Coefficient Diagram Method) to determine gains of servo state feedback controller. We apply this controller in the nonlinear plant, magnetic levitation system, and firstly transform the system to be linear using feedback linearization. CDM is one of the polynomial methods in a control system that based on the equivalent time constant and stability index. The simulation observes the performance of the system with various stability index besides the CDM standard parameter and also compares the CDM with another method i. e. LQR. The simulation shows that the CDM standard parameter can give a good performance of the system so that can avoid the effort of trial and error.