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Proceedings Paper

Design and characteristics of MRF-based actuators for torque transmission under influence of high shear rates up to 34,000s-1
Author(s): Dirk Güth; Vadim Erbis; Markus Schamoni; Jürgen Maas; Thorben Hoffstadt
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Paper Abstract

High rotational speeds for brakes and clutches based on magnetorheological fluids represent a remaining challenge for the industrial or automotive application. Beside particle centrifugation effects and rotational speed-depending no-load losses, the torque characteristic is an important property that needs to considered in the design process of actuators. Due to missing experimental data for these operating conditions, in this paper the shear rate and flux depending yield stress behavior of magnetorheological uids is experimentally investigated for high rotational speeds or respectively high shear rates. Therefore a brake actuator with variable shear gap heights up to 4 mm is designed, realized and used for the experimental investigation, which are performed for a maximum shear rate of ƴ= 34; 000 s-1 under large magnetic elds. The measurement results point out a strong dependency between shear rate, magnetic ux density and resulting yield stress. For low shear gap heights, a significant reduction in the yield stress up to 10 % can be determined. Additionally the development of Taylor vortices is determined, which will not only occur in viscous case without an applied magnetic field. The measurement results are important for a reliable actuator design which should be used in application with high rotational speeds.

Paper Details

Date Published: 1 April 2014
PDF: 9 pages
Proc. SPIE 9057, Active and Passive Smart Structures and Integrated Systems 2014, 90572P (1 April 2014); doi: 10.1117/12.2045306
Show Author Affiliations
Dirk Güth, Ostwestfalen-Lippe Univ. of Applied Sciences (Germany)
Vadim Erbis, Ostwestfalen-Lippe Univ. of Applied Sciences (Germany)
Markus Schamoni, Ostwestfalen-Lippe Univ. of Applied Sciences (Germany)
Jürgen Maas, Ostwestfalen-Lippe Univ. of Applied Sciences (Germany)
Thorben Hoffstadt, Ostwestfalen-Lippe Univ. of Applied Sciences (Germany)

Published in SPIE Proceedings Vol. 9057:
Active and Passive Smart Structures and Integrated Systems 2014
Wei-Hsin Liao, Editor(s)

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