Sliding Mode Control with Frequency Shaped Surface for Rotor-Magnetic Bearing System of Magnetically Suspended Reaction Flywheel

摘要

Alming at high-accuracy active vibration control requirement of magnetically suspended reaction flywheel.a sliding mode control scheme of its rotor-magnetic beanngs based on frequency shaped sliding mode surface is presented.The proposed scheme can deal with imbalance.nonlinearity and external disturbance.Firstly.dynamic model with jmbalance is constructed.Secondly.the whole closed-loop controI system is designed.In the scheme.sliding mode surface optimized bv H(oo) performance is obtained by dynamic filter,a fuzzy logic system realizes self-adaptive gain adjustment to reduce chattering greatly,tracking output and differential are gotten by nonlinear tracking-differentiator.which not only has the properties of good filter performance and suppresses disturbance,but also displacement sensors are removed.which can increase reliability and simplify hardware circuit.Finally.it is verifled that the proposed control scheme is effective.The simulation results show that position and velocity tracking errors are convergent to approach zero in short time.rotor can rotate around the principaI axis of inertia.and automatic balancing is realized.Compared with conventional sliding mode,the proposed scheme has the advantages of smaller controI currents and chattering is not obvious.