Title :
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
fDate :
11/1/1991 12:00:00 AM
Abstract :
Highly Magnetostrictive materials such as Tb0.3Dy0.7Fe2, 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; Tb0.3Dy0.7Fe2; 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;
Journal_Title :
Magnetics, IEEE Transactions on
