Control of Magnetic Levitation System Using PD and PID controller

Abstract

This paper deals with the PD and PID controllers design for Magnetic Levitation system. The magnetic levitation system is an electromechanical coupling concept, in which a metal ball is suspended in air with the help of electromagnets. There are two types of magnetic levitation- Electromagnetic Levitation(EML) and Electrodynamics Levitation(EDL). EML uses electromagnetic force of attraction which attracts the metal ball placed below it and in case of EDL electromagnetic force of repulsion is used to control the position of the ball. This paper deals with the EML type of levitation. Magnetic levitation is highly non linear system. For such type of system it is desired to design a suitable controller for positioning ball at desired position. PID controller using design optimization tool tuning is presented in this paper. Two Degree of Freedom(2 DOF) PID is also designed in this paper which deals with both the reference input and feedback element.