Modeling and Feedback Compensation Control of a Novel Isolated Radial Active Magnetic Bearing

This study introduces a novel isolated active magnetic bearing (IAMB) system featuring an isolation sleeve, which allows the stator and rotor to operate independently in different environments, thereby expanding the application range of traditional active magnetic bearings (AMB). A dynamic equivalent magnetic circuit model (DEMCM) is developed to account for the isolation sleeve's impact on magnetic flux, and a method to determine the IAMB's current operating point based on magnetic density variations is proposed. To counteract the increased system hysteresis due to eddy currents, an electromagnetic force response acceleration strategy with current feedback compensation is presented, alongside an incomplete differential PID controller for rotor position regulation. The system's feasibility and the benefits of the compensation strategy in improving dynamic response and suppressing vibrations are confirmed through experiments on a constructed experimental platform.