新型屏蔽式主动磁悬浮轴承的自感知建模与控制

Magnetic bearings are more and more widely used in the field of energy conversion such as flywheel energy storage. In order to expand the application field of magnetic bearings and make them work in harsh environment such as corrosive liquid, a novel canned active magnetic bearing (CAMB) is proposed in this paper. A layer of non-magnetic and corrosion-resistant metal can is welded on the outer surface of rotor and the inner surface of stator respectively. In order to reduce cost, reduce volume and improve environmental adaptability, the rotor displacement estimation strategy is studied. In this paper, a self-sensing model considering air gap edge effect, magnetic saturation and eddy current is proposed. The influence mechanism of edge effect on self-sensing accuracy is analyzed. A two-winding collaborative estimation strategy considering magnetic saturation is proposed. Finally, the self-sensing experimental platform of CAMB is built to verify that the proposed self-sensing model has high precision, and the CAMB control system based on self-sensing has better dynamic performance.