Analysis of Infinite Stiffness Using PID Controller

TL;DR

This paper demonstrates how a PID controller can be used to achieve infinite stiffness in a magnetic levitation system by actively controlling electromagnet current based on sensor feedback.

Contribution

It introduces a modified PID control approach for magnetic levitation to attain near-infinite stiffness and discusses its application, limitations, and potential scope.

Findings

Successful magnetic levitation with stable object position

Effective control of electromagnet current via analog PID circuit

Feasibility of vibration control techniques for diverse applications

Abstract

The design of Proportional Integral-Derivative (PID) controller is involved to gain infinite stiffness using active vibration control system and it is a modification of previous work. The PID controller is a control loop feedback mechanism which steadily calculates a fallacy value as the difference between a desired set point and a variable process and applies correction based on proportional, integral, and derivative terms. In this paper to achieve infinite stiffness magnetic field has been created by passing current, the input of the electromagnet is the output voltage of the sensor. Depending upon the gap between electromagnet and suspended object vibration is isolated by the attractive force of the electromagnet. This paper also presents the application, limitation, and scope of this system. In our system current is controlled by Analog Circuit (PID). The current moves through the electromagnet which creates magnetic force. If the load increases the proximity sensor senses the distance and delivers signal to the controller circuit. After receiving the signal controller circuit increased current supply to the electromagnet through power amplifier circuit. Magnetic force is expanded then, and object is levitated in a stable position. If the load is decreased the proximity sensor senses the distance and delivers signal to the controller circuit. Controller circuit receives the signal and decreases current supply to the electromagnet through power amplifier circuit. Thus, magnetic force is increased, and object is levitated in a stable position. This paper reveals the feasibility of vibration control techniques for number of diverse applications. This paper is highly applicable for detecting direction that is magnetic levitation system and magnetic bearing.