科研之友
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摘要
It is necessary to reduce the vibration of rotors supported on active magnetic bearings (AMBs) with high displacement precision requirement in operation. An unbalance compensator for an AMB-rigid rotor system is studied. The dynamic model of an AMB-axially symmetric rigid rotor system was first established. Then, the specific form of compensating currents in the AMBs was obtained. At last, an unbalance compensator based on real-time variable step size (VSS) polygonal iterative seeking algorithm for equivalent unbalance coefficients of the rotor at the AMBs positions was proposed. With the compensator, the AMBs produce additional forces that are of same magnitudes but opposite phases as the equivalent unbalance forces at the AMBs positions to reduce the rotor vibration. Since the equivalent unbalance coefficients, which represent the equivalent imbalance of the rotor at the AMBs positions, are independent of the rotating speed, thus, the compensator is suitable for application in both steady state and varying-speed operations. With the VSS method, both the accuracy and the convergence rate of the identification algorithm could be realized. Numerical simulations and experiments confirmed the effectiveness of the proposed method for suppressing the unbalance vibration of the AMB-rotor system in steady states and varying-speed operations.
- 出版日期2018-5
- 单位浙江大学
