Experimental Verification of Nonlinear Position-Flux Zero-Bias Control for Heteropolar Active Magnetic Bearing

摘要

This study presents experimental verificationof a nonlinear position-flux control for active magneticbearing (AMB) system operated with zero-bias flux.Recently developed controllers for nonlinear fluxcontrolledAMB applications are complicated andinherently difficult to implement. Therefore, three designsof low-order controllers are proposed using nonlinearfeedback tools including Lyapunov-based techniquesand control Lyapunov functions (CLFs). The controlobjective is to globally stabilize the rotor mass positionin the AMB system. Responses of the AMB system statesto initial condition and to external load disturbance arepresented and the simulation and experimental resultsfor transient responses are compared. The overshoots arecompensated for the zero neighbourhood, and the rotorposition amplitude does not exceed 2.5% of the air gap.