Abstract
Oil dampers are widely used to absorb vibration or shock energy in transportation equipment and industrial machinery. However, deterioration of the sealing material due to temperature fluctuations or aging can lead to oil leakage, resulting in reduced functionality. Therefore, alternative oilless dampers, such as eddy current dampers have been expected. However, their performance has not yet reached that of conventional oil dampers.
This paper aims to develop an eddy current damper with a damping coefficient of more than 200 N·s/m. A doublepipe structure composed of copper and iron was employed for the stator, and the movable component consisted of optimally designed permanent magnets and iron cores. As a result of optimization using magnetic field analysis, a damping coefficient of 207 N·s/m was estimated. Finally, a prototype was fabricated, and experimental results confirmed a damping coefficient of more than 200 N·s/m.
