The Control Technology Study Of Active Magnetic Bearing Based On E Structure

Active magnetic bearing (AMB) is one of the typical mechatronic products and a new type of high performance bearing which suspends the rotor in a contact-free manner. Since it has many advantages, such as no mechanical contact, no friction, lower power consumption, long service life and no environmental pollution, it has been paid more and more attention in fields of energy resource, aerospace, communication, mechanical industry, robot and medical equipment. Be compared with conventional AMB system, active magnetic bearing system based on E structure is a new one that makes use of magnetism's character which the magnetic line of force always tries to close along minimal route of magnetic reluctance. The active magnetic bearing system based on E structure not only supports regular rotator's motion of radial active magnetic bearing, but also corrects axial position automatically when axial position deviation occurs in the process of rotator's motion, so as to lessen the burden of work of axial magnetic bearing and protecting auxiliary bearing, and to improve the stability of system.This thesis did a further research on each section of AMB, including:Firstly, a single freedom degree mathematics model and the four degree of freedom state equation of AMB are found based on the analysis of AMB principle; Secondly, a suspension experiment of one degree of freedom AMB is executed based on the analog control system and the digital control system, and the rotor's quick adjusting and steady levitating are examined; Thirdly, systematic debugging of E type electromagnetism axle bearing and experiment data analysis based on PID controller have been realized. The simulation results show that the active magnetic bearing system based on E structure is feasible.