Study on PDF control system for magnetic suspension bearing of fan

The magnetic suspension bearing system of fan rotor was studied,and the mathematical model of fan electro-magnetic bearing system with permanent magnet deflection was established.According to the model,a pseudo derivative feedback(PDF)control system was designed,which can meet the control performance requirements of magnetic suspension bearing.The simulation contrast between the PDF control system and conventional PID control system was carried out,which shows that the PDF control system possesses better dynamic capability,stability and anti-interference robust performance.