Modeling of Moving-Conductor Type Eddy Current Damper

概要

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When a conducting plate moves through a nonuniform magnetic field, electromotive forces are induced in the conducting plate. According to Fleming's right-hand rule and left-hand rule, the induced currents produce a magnetic drag force. In these rules, a magnetic field perpendicular to the direction of movement generates a magnetic damping force. In the present work, we provide a possible resolution to the modeling of moving-conductor type eddy current dampers, using infinitesimal loop coils. Our model has three advantages: the equation of the magnetic damping force is simple; we can use the static magnetic field obtained by using the finite element method (FEM), the Biot-Savart law or experiments; and the model automatically satisfies boundary conditions. Using infinitesimal loop coils, we have modeled the magnetic damping force produced by a moving-conductor type eddy current damper composed of electromagnets and a conducting disk. Furthermore, the experimental setup has been fabricated, and damping ratios from experiments are compared to the analytical results and are found to be in good agreement with them.
日本機械学会の論文