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This research focuses on the design and application of rotary magnetorheological fluid devices.

April 5, 2026Journal of the Japan Society of Applied Electromagnetics and Mechanics0 citationsOpen Access

Rotational Magnetorheological Fluid Device and its Application

Key Points

This research focuses on the design and application of rotary magnetorheological fluid devices.
Overview of rotary-type MR fluid devices featuring integrated magnetic poles and moving components.
Development of a miniature MR fluid device utilizing a cylindrical rotor.
Creation of a fail-safe MR fluid device using electromagnets and permanent magnets.
Demonstrated the ability of MR fluids to change properties rapidly under magnetic fields.
Established effective applications in force-control devices with rotational motion.

Abstract

Magnetorheological (MR) fluids, a type of functional fluid, are capable of rapidly and reversibly altering their rheological properties in response to an external magnetic field.This unique characteristic enables their application in various mechatronic devices that require semi-active control of resistance and transmission forces.To integrate MR fluids into such force-control devices, two essential components are required: magnetic poles for applying a magnetic field to the fluid layer, and a mechanical structure capable of converting changes in the fluid's dynamic properties into device output.This paper provides an overview of rotary-type MR fluid devices in which the magnetic poles and the moving components are integrated and perform rotational motion.As application examples, we introduce two devices recently developed by the authors: a miniature MR fluid device using a cylindrical rotor, and a fail-safe MR fluid device using both electromagnets and permanent magnets.

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