Abstract
Magnetorheological fluid (MRF) is a new type of intelligent magnetic materials that can transform from liquid to solid or semi-solid in milliseconds under the action of an applied magnetic field. It has been widely used in fields such as automotive, construction, vibration control, and ultra precision machining. MRF brakes and MRF clutches are important application areas of MRF, which are typical MRF transmission devices based on shear mode of MRF. In this paper, the concepts of MRF and MR effect are introduced, and the common engineering applications of MRF devices are illustrated at first. Based on the operational modes of MRF, the main structure and operational principle of MR brakes/clutches are presented in detail. Then, MRF brakes/clutches are summarized and classified into disc-type and cylinder-type. The structural configurations of MRF transmission devices in the past 15 years are summarized respectively. Furthermore, the disc-type MRF brakes/clutches are categorized and summarized in terms of the number of excitation sources, the number of MRF gaps, and the shape of MRF gaps, while the cylinder-type MRF brakes/clutches are summarized in terms of the number of magnetic poles as well as the number of MRF gaps. Finally, an overview of the critical issues affecting the performance of MRF transmission devices is analyzed, the development trends of MRF transmission devices are explored and the structural development of MR brakes/clutches is described.
Published Version
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