研究活動
　ECF MicroMotors 　ECF MicroActuators 　ECF-jets Pumps 　ERF Valves
　ERF MicroValves 　Micro Machine 　MRF Valves 　MRF MicroValves
　Micro Pumps 　Sensors 　Manipulators 　CPS Systems
 
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Micro Valves using Magneto-Rheological Fluids

Micro MRValve using Temparature-sensing Ferrite
Micro Magnetizable Liquid valve-body Valve

Micro valves using Magneto-rheological Fluids (MRF) are proposed and developed. The MRF is a suspension of dielectric fluids with micro-size magnetic particles, which increases the apparent viscosity in an applied static electric field. MRVs are fabricated as a pressure control valve for micro systems. A microvalve using a MR fluid drop as a valve-body (Magnetizable Liquid Valve-body Valve; MLV valve) is proposed, fabricated, and tested. The valve utilizes the pulling force of MR fluid to the applied magnetic field and can shut off the flow irrespective of the machining errors.
 
Principle of the MR Valve
Micro MRValve using Temparature-sensing Ferrite
Micro Magnetizable Liquid valve-body Valve
Research Activities
(1) K.Yoshida, Y.-O. Jung, S.Yokota, : A Micro Fluid Power System Using Magneto-Rheological Fluid Valve-Body, Proc. of the First Joint International Conference on Manufacturing, Machine Design and Tribology (ICMDT Intl.), CD-Rom MAA-101, Seoul, Korea, (2005)
(2) Kazuhiro Yoshida, Yeon-Oh Jung, Shinichi Yokota: A Micro Valve Using MR Fluid Valve-Body, Proc of ICMT2002, Kitakyushu, pp.423/428, (2002)
(3) Kazuhiro YOSHIDA, Hiroyuki TAKAHASHI, Shinichi YOKOTA, Masashi KAWACHI, Kazuy EDAMURA : A Bellws -driven Motion Control System Using a Magneto-Rheological Fluid, Proc. of the Fifth JFPS Intl. Sympo. on Fluid Power Nara, Japan, Vol.2, pp403/408, (2002)

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