Abstract
Magnetorheological fluid (MRF) is functional fluid whose viscosity changes under magnetic field. It is used in applications such as dampers and brakes. In this research, permanent magnets are used to hold MRF between two rotating bodies. Traction force generated by MRF under magnetic field used to transmit power between the rotating bodies without vibration and noise. In this paper, we research the arrangement of permanent magnets and the configuration of magnetic circuits that hold MRF in the gap between rotating bodies and transmit rotational power without supplying additional MRF, and report on the improvement of power transmission efficiency. In this research, three models are assembled. Nonmagnetic rollers are used as the rotating body in Model 1, nonmagnetic disks are used in Model 2, and ferromagnetic disks are used in Model 3. The results showed that Model 3 was superior in both power transmission efficiency (74.6 [%]) and maximum transmission torque (0.55 [N∙m]). This is due to the fact that the use of a disk as the rotating body enables power transmission through the MRF over a wider area than with a roller type, and that a ferromagnetic disk can hold the MRF strongly.
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