Dynamic Analysis and Control of Rigid Rotor Supported by Noncollocated Active Magnetic Bearing
- Dynamic Analysis and Control of Rigid Rotor Supported by Noncollocated Active Magnetic Bearing
- 전한욱; 이종원; 김승종
- Issue Date
- Proceedings of the 8th IFToMM Int'l Conf. on Rotor Dynamics
- In many rotor-Active Magnetic Bearing (AMB) systems, there exists an inevitable non-collocation problem of magnetic bearings and sensors, while few research works have been conducted on its dynamic behavior and stability. The conventional PD controllers, applied for both levitation and vibration suppression of the rigid rotor, are usually designed based on assumption of collocated sensors and result in the guaranteed stability with the passivity of the system. However the feedback controlled rigid rotor-bearing system with noncollocated AMBs is reduced to the form of non-conservative gyroscopic system with circulatory matrix. Based on the equations of motion derived with respect to the bearing coordinates in complex domain, this paper consequently attempts to analyze the dynamic behavior in modal interpretations and find out the condition of the instability. The optimal control scheme with the compensation algorithm of time delay is applied to a rigid rotor-AMB system, and the control performance is investigated throughout simulations and experiments. It is also shown that the controller designed in consideration of the non-collocation effect guarantees significant improvement in control performance.
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