Field Dynamic Balancing for AMBs Supporting Rotor Shaft Based on Extended State Observer

There are promising applications for high rotational speed machines supported by active magnetic bearings (AMB), whereas it is inevitable that the rotor shafts own unbalance masses more or less. Field dynamic balancing based on disturbance observer was proposed, which could effectively eliminate vibrations derived from unbalances. A band-pass filter was cascaded after the observer, which could weaken the effects from harmonic or noise disturbances. Frequency responses were measured to compensate the characteristics of the observation module to enhance the accuracy. With the precise identification results, rotor dynamic balancing could be carried out to revise the unbalances, which was verified by simulation results.