Abstract: The balancing process for a magnetic suspending flywheel is complex, and the rotor always exhibits less than satisfactory performance after it has been balanced on a mechanicalbalancemachine. In view of this,a field balancing method is developed based on the modeling and analyzing of the magnetic bearing system, and the impact of the magnetic force is calculated. The balancing process of the integrated rotor system rather than the rotor itself is considered. Using the field balancing method, the equivalent static and dynamic imbalances are obtained respectively by the detection of the translational signal and the rotational signal of the rotor. The experimental results show that this method can improve significantly the balancing accuracy of the rotor system and reduce rotor displacement, the current of the magnetic bearing as well as the vibration of the flywheel.

Key words: magnetic bearings, flywheel, rotors, balancing