| Title |
Damping Force Enhancement design of an Eddy Current Type EM Damper Using a Flux Concentrated Structure |
| Authors |
신민혁(Min-Hyeok Shin) ; 정문석(Mun-Seok Jung) ; 김성민(Sung-Min Kim) ; 엄재부(Jae-Boo Eom) ; 정태욱(Tae-Uk Jung) |
| DOI |
https://doi.org/10.5370/KIEE.2026.75.5.1060 |
| Keywords |
EM Damper; Eddy Current; Flux Density; Damping Force; Finite Element Analysis(FEA); Response Surface Method(RSM) |
| Abstract |
In this paper, we suggested an eddy current type electromagnetic (EM) damper to reduce vibration generated during the operation of a drum washing machine. The proposed damper consists of a copper cylinder and permanent magnets, and generates damping force through eddy current while maintaining a simple mechanical structure. To enhance the magnetic flux linking the copper cylinder, an iron spacer was inserted between the permanent magnets, resulting in increased current density and damping force, as verified through finite element analysis (FEA). In addition, a back-yoke was installed inside the copper cylinder to establish an effective magnetic path, suppress flux leakage, and further increase the magnetic flux density within the conductor, leading to additional improvement in damping performance. Furthermore, the effects of copper and yoke thickness on damping force were investigated, and optimal design parameters were obtained using the response surface method (RSM). The optimal model with a back-yoke exhibited significantly higher damping force compared to the model without a yoke. Frequency-dependent analysis confirmed that the damping force is proportional to velocity, demonstrating viscous damping characteristics and effective vibration suppression under varying dynamic conditions. The results demonstrate that the proposed structure effectively improves magnetic flux utilization. |