組み合わせ磁石を用いた磁気ダンパの研究（基本ハルバッハ配列磁石を用いた磁気ダンパ）

概要

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The damping force of a magnetic damper is based on the Lorentz force. That is to say, the magnetic damping force is generated in the direction opposite to the relative motion of a conductor with respect to a magnet. Normally, a magnetic damper uses two conducting plates facing the opposite sides of a magnet. If only one side of the magnet is used, the magnetic damping force is less. In the present work, a new magnetic damper composed of Halbach magnet arrays arranged in three parallel lines is proposed. A basic Halbach magnet array consists of five magnet cubes that are glued in the specific directions relative to each other, and is characterized as having a strong magnetic field on one side and a weak field on the other. For this reason, it is possible to realize a high-performance magnetic damper using only one side of a magnet. The magnetic fields of the Halbach magnet arrays of the new magnetic damper we are proposing, together with other magnet arrays, were investigated analytically using Biot-Savart’s Law. Furthermore, the proposed magnetic damper was fabricated and tested. The experimental results were compared with the analytical results. As a result, the effectiveness of the new magnetic damper was confirmed.