Abstract
The use of the linear magnetostrictive motor (LMM) in outer space, in the absence of Earth’s gravitational field and where extreme temperatures manifest, involves innovative technical solutions that result in significant construction changes. This paper highlights these constructive changes and presents the mathematical modeling followed by the numerical simulation of different operating regimes of LMM. The novelty of the design resides in using a bias coil instead, in addition to permanent magnets, to magnetize the magnetostrictive core and pulse width modulated (PWM) power sources to control the two coils of the LMM (bias and activation). The total absorbed current is less than 2 A, which results in the reduction of Joule losses. Moreover, a PWM source is provided to power and control a set of three Peltier elements aimed at cooling the device. The experiments validate the design of the LMM, which elicits it to power and control devices that may modulate fuel injection for rocket engines or for machines used to adjust positioning on circumterrestrial orbits.
Highlights
The giant magnetostrictive actuator (GMA), known as the linear magnetostrictive motor (LMM), is the object of continuous innovation and intense research
Liu et al proposed a magnetostrictive actuator in which the bias magnetic field is provided by alternatively stacking permanent magnets with giant magnetostrictive material (GMM)
On the GMM core, the permanent (1) acts a bias magnetic field, which is obtained by the cumulative effect of the magnetic field of the permanent magnets of cylindrical shape ((3) and (4)) respectively of the magnetic field generated by the coil of magnetic bias (12)
Summary
The giant magnetostrictive actuator (GMA), known as the linear magnetostrictive motor (LMM), is the object of continuous innovation and intense research. The working principle and design of the LMM rely on the deformation of a magnetostrictive (MS). The MS rod contracts when the magnetic flux goes through and elongates to the rest state (size) when the magnetic field is suppressed. The size of the magnetostrictive rod deformation is proportional to the magnetic field provided by the coil system that, in turn, is a function of the electrical current. Liu et al proposed a magnetostrictive actuator in which the bias magnetic field is provided by alternatively stacking permanent magnets with giant magnetostrictive material (GMM). Rods to produce a stacked magnetic-biased giant magnetostrictive actuator (SGMA) [1]. Dorota et al proposed a simplified form of a GMA that consists of a cylindrical Terfenol-D (Tb–Dy–Fe alloy) rod, which is magnetically excited by a coil surrounding the rod to generate strain and force
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