Active Magnetic Bearing Control

Active magnetic bearing (AMB) has been paid more and more attention by science researchers because of its many merits such as no mechanical contact, no wear, no need of lubrication and long service life, etc. AMB's performance is determined mainly by its control system. Therefore, it has great significance to study AMB's control system. This paper focuses on the control algorithm and its software design.Mathematical model of 4 radial degrees of freedom AMB is built. A central PID controller and a decentralized PID controller are designed respectively. The digital simulation shows that the decentralized controller meets the demands of rigid rotor AMB. State feedback controller is designed using linear quadratic regular, and the result of computer simulation is good.The assembly program based on the decentralized PID regular is written and applied to the TMS320F240 DSP control system of AMB. The stable suspension and high-speed rotation of the 4 degrees of freedom rigid rotor are achieved, and the radial vibration rangeof the AMB rotor's axes is less than 20 μm .