Adaptive variable bias magnetic bearing control

D. Johnson, G.V. Brown, D.J. Inman
1998 Proceedings of the 1998 American Control Conference. ACC (IEEE Cat. No.98CH36207)  
Most magnetic bearing control schemes use a bias current with a superimposed control current to linearize the relationship between the control current and the force it delivers. With the existence of the bias current, even in no load conditions, there is always some power consumption. In aerospace applications, power consumption becomes an important concern. In response to this concern, an alternative mag- bearing control method, called Adaptive Variable Bias Control (AVBC), has been developed
more » ... nd its performance examined. The AVBC operates primarily as a proportional-derivative controller with a relatively slow, bias current dependent, time-varying gain. The AVBC is shown to reduce electrical power loss, be nominally stable, and provide control performance similar to conventional bias control. Analytical, computer simulation, and experimental results are presented in this paper.
doi:10.1109/acc.1998.703021 fatcat:g5zqf2heerdwxjuoclvnnvz5tm