Identification of Parameters in Active Magnetic Bearing Systems

A method for identifying uncertain parameters in Active Magnetic Bearing (AMB) based rotordynamic systems is intro- duced and adapted for experimental application. The Closed Loop Identification (CLI) method is utilised to estimate the current/force factors K_i and the displacement/force factors K_s as well as a time constant tau_e for a first order approxima- tion of unknown actuator dynamics. To assess the precision with which CLI method can be employed to estimate AMB parameters the factors K_i , estimated using the CLI method, is compared to K_i factors attained through a Static Loading (SL) method. The CLI method and SL method produce similar results, indicating that the CLI method is able to perform closed loop identification of uncertain AMB parameters.