Rotor Dynamic Balance Making Use of Adaptive Unbalance Control of Active Magnetic Bearings

In a high speed rotor supported by active magnetic bearings, the rotor operation was greatly influenced by a large residual unbalance in the rotor and some low frequency vibration modes from the structure of the rotor system. A general dynamic balance procedure was not suitable for the rotor, an adaptive unbalance control method of active magnetic bearings called Generalized Notch Filter was used to help the rotor to run to a suitable balance speed and help the rotor to increase its dynamic balance efficiency with two different methods. In the first method, Generalized Notch Filter was used to restrain the synchronous vibration of the rotor and then identify the rotor unbalance distribution. In the second method, it was just used to decrease the vibration amplitude. Corresponding experiment results are provided. Generalized Notch Filter algorithm settled the balance problem and increased the balance efficiency.