Theory and experiment of magnetic bearing combining radial control and thrust control.

Adaptive control of active magnetic bearings under unknown static load change and unbalance

“…Note that A(t) and B(t) defined in(18) and(19) respectively are bounded, i.e., IA(t)l 5 A and IB(t)I 5 B. Since bc(t), r(t), q l ( t ) , and q~( t ) approach zero as time gets large, there exists a time t L 2 t L and any arbitrarily small positive number E .…”