10 April 2013 Energy-efficient MRF clutch avoiding no-load losses
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Abstract
A challenge opposing a commercial use of actuators like brakes and clutches based on magnetorheological fluids (MRF) are durable no-load losses. A complete torque-free separation of these actuators is inherently not yet possible due to the permanent liquid intervention for the fluid engaging parts. Especially for applications with high rotational speeds up to some thousand RPM, this drawback of MRF actuators is not acceptable. In this paper, a novel approach will be presented that allows a controlled movement of the MRF from a torque-transmitting volume of the shear gap into an inactive volume of the shear gap, enabling a complete separation of the fluid engaging surfaces. This behavior is modeled for a novel clutch design by the use of the ferrohydrodynamics and therefore simulations are performed to investigate the transitions between engaged and idle mode. Measurements performed with a realized clutch show that the viscous induced drag torque can be reduced significantly.
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Dirk Güth, Markus Schamoni, Jürgen Maas, "Energy-efficient MRF clutch avoiding no-load losses", Proc. SPIE 8688, Active and Passive Smart Structures and Integrated Systems 2013, 86881D (10 April 2013); doi: 10.1117/12.2009698; https://doi.org/10.1117/12.2009698
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