Control Of The Axial Magnetic Rotor Control System

Magnetic bearings has been paid more and more attention because of its many merits such as no mechanical contact, no wear, low power loss, no need of lubrication and long service life, etc. And they will be used in many fields with high technology widely such as aircraft and high speed and high precision machine tool. The stability analysis and control way can be applied in other magnetic suspension fields. Therefore, it has great significance to analyze the stability and research the control mechanism of the magnetic bearings.This paper put stress on the method of control and power amplification to the magnetic levitation. At first, single freedom degree mathematics model on the basis of current and voltage controlled magnetic suspension are set up respectively. More studies are discussed base on the mathematical models; the important thing is to find an easy and advanced control method. Base on the traditional control method (PID) and the advanced control method (Expert-PID), designed two kinds of compensator; And then compare the performance of these two controllers through experiment. The results show: The magnetic levitation system will be more stable and robust base on the Expert-PID control theory. The system can be stable situation in short time.To endure the carring out of the control strategy, it is necessary to design the actuating mechanism of good performance. So we design separately linear power amplifier and H type PWM power amplifier. Through performance adjustment and the results show: The linear power amplifier can implete stable levitation of single freedom degree magnetic levitation system, but it can't provide high-current; and so design H type PWM power amplifier ,the test result show that it can satisfy specific requirements of magnetic levitation.