Electromagnetic Design and Performance Evaluation of an MR Valve

MR 밸브의 전자기적 설계와 성능평가

  • 김기한 (부산대학교 대학원 기계공학부) ;
  • 남윤주 (부산대학교 대학원 지능기계공학과) ;
  • 박명관 (부산대학교 기계공학부 및 기계기술 연구소)
  • Published : 2008.03.01


This paper presents an electromagnetic design method for magneto-rheological (MR) valves. Since the apparent viscosity of MR fluids is adjusted by applying magnetic fields, the MR valves can control high-level fluid power without any mechanical moving parts. In order to improve the performances of the MR valve, it is important that the magnetic field is effectively supplied to the MR fluid. For the purpose, the magnetic circuit composed with the yoke for forming magnetic flux path, the electromagnetic coil and the MR fluid should be well designed. In order to improve the static characteristic of the MR valve, the length of the magnetic flux path is decreased by removing the unnecessary bulk of the yoke. Also, in order to improve its dynamic and hysteretic characteristics, the magnetic reluctance of the magnetic circuit should be increased by minimizing the cross-sectional area of the yoke through which the magnetic flux passes. After two MR valves, one is a conventional type valve and the other is the proposed one, are designed and fabricated, their performances are evaluated experimentally.


Electromagnetic Design;Magneto-Rheological Fluid;MR Valve


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