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Title: Magnetostrictive direct drive motor

Abstract

Highly magnetostrictive materials such as Tb.3Dy.7Fe{sub 2}, 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, approx. 2000 ppm at moderate magnetic field strengths, makes possible a new generation of magnetomechanical devices. NASA researchers are studying the potential of this material as the basis for a direct microstepping rotary motor with torque densities on the order of industrial hydraulics and five times greater than that of the most efficient, high power electric motors. Such a motor would be a micro-radian stepper, capable of precision movements and self-braking in the power-off state. Innovative mechanical engineering techniques are juxtaposed on proper magnetic circuit design to reduce losses in structural flexures, inertias, thermal expansions, eddy currents, and magneto-mechanical coupling, thus optimizing motor performance and efficiency. Mathematical models are presented, including magnetic, structural, and both linear and nonlinear dynamic calculations and simulations. In addition, test results on prototypes are presented.

Authors:
;
Publication Date:
Research Org.:
North Carolina Univ., Charlotte, NC (United States)
OSTI Identifier:
5412303
Report Number(s):
N-91-22561; NASA-CR-188006; TR-91-2; NAS-1.26:188006
CNN: NAG5-1169
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English
Subject:
32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION; ELECTRIC MOTORS; RESEARCH PROGRAMS; MAGNETIC FIELDS; MAGNETOSTRICTION; MATHEMATICAL MODELS; MAGNETIC PROPERTIES; MOTORS; PHYSICAL PROPERTIES; 320303* - Energy Conservation, Consumption, & Utilization- Industrial & Agricultural Processes- Equipment & Processes

Citation Formats

Naik, D, and Dehoff, P H. Magnetostrictive direct drive motor. United States: N. p., 1991. Web.
Naik, D, & Dehoff, P H. Magnetostrictive direct drive motor. United States.
Naik, D, and Dehoff, P H. 1991. "Magnetostrictive direct drive motor". United States.
@article{osti_5412303,
title = {Magnetostrictive direct drive motor},
author = {Naik, D and Dehoff, P H},
abstractNote = {Highly magnetostrictive materials such as Tb.3Dy.7Fe{sub 2}, 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, approx. 2000 ppm at moderate magnetic field strengths, makes possible a new generation of magnetomechanical devices. NASA researchers are studying the potential of this material as the basis for a direct microstepping rotary motor with torque densities on the order of industrial hydraulics and five times greater than that of the most efficient, high power electric motors. Such a motor would be a micro-radian stepper, capable of precision movements and self-braking in the power-off state. Innovative mechanical engineering techniques are juxtaposed on proper magnetic circuit design to reduce losses in structural flexures, inertias, thermal expansions, eddy currents, and magneto-mechanical coupling, thus optimizing motor performance and efficiency. Mathematical models are presented, including magnetic, structural, and both linear and nonlinear dynamic calculations and simulations. In addition, test results on prototypes are presented.},
doi = {},
url = {https://www.osti.gov/biblio/5412303}, journal = {},
number = ,
volume = ,
place = {United States},
year = {Fri Mar 01 00:00:00 EST 1991},
month = {Fri Mar 01 00:00:00 EST 1991}
}

Technical Report:
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