Experimental Mechanics

, Volume 40, Issue 2, pp 231–240 | Cite as

A device to regulate rotational speed using a rotating regulator with electrorheological fluid

  • K. Shimada
  • T. Fujita
Article

Abstract

The authors propose a device consisting of a rotating regulator within an electrorheological fluid (ERF), in which the rotational speed of the rotating body can be regulated by supplying an electric field. This new type of device with ERF is relevant to engineering applications and can play a role in braking as well as in rotation regulation. The ERF used here consists of a colloidal suspension of smectite particles in a solvent. The experimental conditions are fixed in a range of comparatively small rotational speed. The authors clarified the hydrodynamic and electrical effects of the shape of the rotating disk, the kind of solvent contained in the ERF, the temperature, the electrode gap and the electric field strength on the steady characteristics of the torque, the electric current density and the electric power to a rotational speed. From the torque and rotational speed data, empirical equations were derived using nondimensional parameters for the purpose of convenient engineering design. The authors also clarified the correlation between the hydrodynamic and steady electric characteristics of the device and the transient characteristics of torque, the electric current and the rotational speed.

Key Words

Electrorheological fluid torque current density rotational speed electric field electrode gap 

Nomenclature

a

constant

Cm

moment coefficient (−)

Do

typical shear rate (1/s)

d

diameter of rotating disk (mm)

d

diameter of shaft attached to rotating disk (mm)

E

electric field strength (=V/E) (kV/mm)

G

electrode gap (mm)

h

thickness of rotating disk (mm)

I

electric current density (A/m2)

N

rotational speed (rpm)

n

constant

Re

rotating Reynolds number (−)

ro

radius of shaft attached to rotating disk (=d′/2) (mm)

r1

radius of rotating disk (=d/2) (mm)

T

torque (mN m)

t

temperature of electrorheological fluid (°C)

V

voltage (kV)

W

electric power (W)

μe

apparent viscosity (Pa s)

ρ

density of electrorheological fluid (kg/m3)

ω

angular velocity (=2πN) (1/s)

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Copyright information

© Society for Experimental Mechanics, Inc. 2000

Authors and Affiliations

  • K. Shimada
    • 1
  • T. Fujita
    • 2
  1. 1.Faculty of System Science and Technology, Akita Prefectural UniversityDepartment of Machine Intelligence and System EngineeringTsuchiya, HonjoJapan
  2. 2.Department of Materials-process Engineering and Applied Chemistry for the Environment, Faculty of Engineering and Resource ScienceAkita UniversityAkitaJapan

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