J-008

Vibration Control of Flexible Rotor Supported by Inclination Control Magnetic Bearings

Authors: Yohji Okada, Takashi Saitoh and Yoshihiko Shinoda
Affiliation: Ibaraki University and Japan Nuclear Cycle Development Institute

Abstract
A new type of magnetic bearing is introduced to control the bending modes of a flexible rotor. The technique is intended to stabilize a flexible rotor which can experience a range of bending modes. The rotor is assumed to be flexible and supported by magnetic bearings. However, the midspan bearing is not allowed for the fundamental rotor functions. The rotor should run super critical speed. A newly developed magnetic bearing is introduced which is composed of pair of HB type magnetic bearings and can control inclination as well as position of the rotor. The center position of the bearing is controlled by the same directional force of both bearings, while the inclination is controlled by the opposite force of them. The position control capability is used to support the rotor, while the inclination control capability is used to increase damping of the bending modes. An experimental setup is made to confirm the proposed technique. The results are indicating high possibility of reducing the bending vibration by using the proposed pair of HB type magnetic bearing.

Yohji Okada
Prof. of Mechanical Engineering
Ibaraki University
4-12-1 Nakanarusawa, Hitachi 316-8511, Japan
FAX.+81-294-38-5047 or +81-294-38-5178
Tel.+81-29-228-8111 ex. 5025, (Direct in, +81-294-38-5025)
okada@mech.ibaraki.ac.jp