Magnetic Bearing Systems and Methods of Controlling the Same

摘要

A magnetic bearing system (100) includes a first electromagnet (104), a second electromagnet (106) opposing the first electromagnet, and a rotor (102) positioned between the first and second electromagnets. The first and second electromagnets are configured to apply a magnetic force. The system also includes a controller (110) configured to determine a control action necessary to move the rotor to a predetermined rotor setpoint. The system further includes a nonlinear compensation device (112) configured to calculate a first electrical current setpoint for the first electromagnet and a second electrical current setpoint for the second electromagnet to maintain a predetermined stiffness during at least one of startup, operation, and shutdown of the magnetic bearing system. The first and second electrical current setpoints are calculated based on the control action determined by the controller.