Magnetostrictive direct drive rotary motor development

Author

Vranish, J.M. ; Naik, D.P. ; Restorff, J.B. ; Teter, J.P.

Author_Institution

NASA Goddard Space Flight Center, Greenbelt, MD, USA

Volume

27

Issue

6

fYear

1991

fDate

11/1/1991 12:00:00 AM

Firstpage

5355

Lastpage

5357

Abstract

Highly Magnetostrictive materials such as Tb_0.3Dy_0.7Fe₂, commercially known as Terfenol-D, have been used to date in a variety of devices such as high-power actuators and linear motors. The larger magnetostriction available in twinned single-crystal Terfenol-D, approximately 2000 p.p.m. at moderate magnetic field strengths, makes possible a new generation of magneto-mechanical devices. The authors are investigating the potential of this material as the basis of a direct micro-stepping rotary motor. Such a motor would be a high torque micro-radian stepper, capable of precision movements and self-braking in the power off state. A motor prototype being developed based on the proven `inch worm´ technique is presented. Results of mathematical modeling techniques are presented, including magnetic, structural, and both linear and nonlinear dynamic calculations

Keywords

dysprosium alloys; iron alloys; magnetostrictive devices; small electric machines; stepping motors; terbium alloys; Tb_0.3Dy_0.7Fe₂; Terfenol-D; linear dynamic calculations; magneto-mechanical devices; magnetostriction; mathematical modeling techniques; micro-radian stepper; micro-stepping rotary motor; nonlinear dynamic calculations; self-braking; torque; Hydraulic actuators; Iron; Magnetic devices; Magnetic fields; Magnetic materials; Magnetostriction; Magnetostrictive devices; Micromotors; Prototypes; Torque;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.278837

Filename

278837