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Actuators 2018, 7(2), 21; https://doi.org/10.3390/act7020021

Lateral Vibration Suppression by Varying Stiffness Control in a Vertically Active Magnetic Suspension System

Department of Mechanical Engineering, Saitama University, Shimo okubo 255, Sakura-ku, Saitama 338-8570, Japan
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Received: 22 March 2018 / Revised: 20 April 2018 / Accepted: 27 April 2018 / Published: 10 May 2018
(This article belongs to the Special Issue Magnetic Bearing Actuators)
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Abstract

Reduction of vibration in passively supported lateral directions by varying stiffness control is discussed in a vertically active magnetic suspension system. In the target system, one pair of electromagnets is arranged in differential driving mode to actively control the vertical motion of the floator. Usually the floator is prone to vibrate in the lateral direction because it is passively supported by virtue of the edge effect of the electromagnets. In this work, such vibrations are reduced by incrementing or decrementing the currents simultaneously during vibration without changing the vertical position of the floator. This control strategy is implemented in a developed apparatus where an iron ball is suspended by differentially operated electromagnets without any mechanical contact. Experiments are carried out, and the results show the reduction of lateral vibrations without changing the vertical position of the floator. View Full-Text
Keywords: vertically active magnetic suspension; differential driving mode; varying stiffness; lateral vibration vertically active magnetic suspension; differential driving mode; varying stiffness; lateral vibration
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Javed, A.; Mizuno, T.; Takasaki, M.; Ishino, Y.; Hara, M.; Yamaguchi, D. Lateral Vibration Suppression by Varying Stiffness Control in a Vertically Active Magnetic Suspension System. Actuators 2018, 7, 21.

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