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In industrial rotational machinery, it has been required that a long span and a high-speed rotor are designed in order to improve efficiency and reduce costs. In concerning many flexible rotors, the 1st bending critical speed and the 2nd bending critical speed have been passed, but never the 3rd critical speed. In this study a flexible rotor having the 3rd bending critical speed within the rated speed was designed, and was tested to pass the 3rd bending critical speed, owing to fine tuning of Active Magnetic Bearing controller and accurate balancing method.

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Booktitle: Proceedings of ISMB10