Abstract
A repulsive magnetic bearing (RMB) supports a rotating shaft without contact by utilizing a magnetic repulsive force between magnets. However, the rotating shaft may contact with a backup bearing during its passage of the critical speed and its vibration may increase due to the small damping and the nonlinearity. A vibration suppression method by controlling the axial displacement of the RMB depending on the rotational speed is proposed. The control of the axial displacement enables it to control the linear and nonlinear stiffness of simultaneously. The main resonance and the nonstationary vibration can be suppressed. These results are validated experimentally.
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