Magnetic Shielding Concepts for Reaction Wheel Assembly on NASA Europa Clipper Spacecraft

Dang, Katherine; Narvaez, Pablo; Berman, Joshua A.; Kevin, Pham; Curiel, A. da Silva

doi:10.1109/emcsi38923.2020.9191616

Cited by 9 publications

(3 citation statements)

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“…The double wall cylindrical prototype shield geometry was modeled after a prototype shield for the NASA‐JPL Europa Clipper Reaction Wheel Assembly [ 2 ] and a triple wall version was fabricated to demonstrate enhanced shield effectiveness with the addition of a third wall within the same part volume. Shield attenuation effectiveness was determined by first measuring the magnetic dipole moment of a magnet by itself from a distance of 0.7 m. Next, the magnet was placed inside the prototype shield and the magnetic dipole moment was remeasured.…”

Section: Methodsmentioning

confidence: 99%

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Magnetic shielding for flight hardware is becoming increasingly important in controlling magnetic interference between highly sensitive instruments such as magnetometer sensors and co-located engineering subsystems containing mechanisms and motors (e.g., reaction wheel assemblies, scanning mechanisms, and cryogenic coolers). [1,2] One way to mitigate magnetic interference is to attenuate these magnetically noisy sources through shielding; however, iterative design and fabrication of such shielding are fraught with challenges due to the complex nature of and difficulty manufacturing very effective magnetic shields. There are many factors to consider in a shield design including alloy composition, shielding thickness for the required attenuation, and geometric constraints such as volume.

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Magnetic Behavior of a Laser Deposited Fe–Ni–Mo Alloy

et al. 2023

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Magnetic shielding in spacecraft is a mission‐critical issue that must be addressed in a timely and effective manner. The high permeability of Fe–Ni–Mo alloys, makes them excellent candidates for magnetic shielding. This article explores a new and innovative approach, enabled by additive manufacturing (AM), to design, build, and test geometrically complex magnetic shields. A Fe–79.7Ni–4.1Mo alloy is additively manufactured using blown powder laser‐directed energy deposition (DED). AM build conditions are explored in the production of magnetic test rings and magnetic shield prototypes. Magnetic hysteresis test data are obtained, allowing for the determination of magnetic permeability, saturation, and coercivity. Detailed microstructural characterization is carried out. Three different prototype shield designs are printed and magnetic shield attenuation data is obtained. The magnetic field attenuation (shield effectiveness) obtained for the AM components is comparable to wrought equivalents. The values reported here for the magnetic permeability are the highest, and that for the magnetic coercivity the lowest, for any blown powder DED‐printed material currently known. The magnetic behavior is discussed with regard to grain size and orientation, as well as grain boundary effects, with all of these attributes contributing to the ultimate performance.

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Section: Methodsmentioning

confidence: 99%

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Magnetic Behavior of a Laser Deposited Fe–Ni–Mo Alloy

et al. 2023

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“…The motor originates a rotation on the flywheel producing an angular momentum compensated by a motion in the opposite direction, moving the spacecraft. Controlling electromagnetic interference (EMI) is even more important as recent space scientific missions require lower levels of magnetic field emissions to conduct experiments onboard [1], [2], [3], [4], [5], [6]. In fact, reaction wheels can compromise scientific data, and sometimes, results have to be discarded.…”

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Time-Domain Electromagnetic Characterization of Reaction Wheel for Space Applications

Pous

Zhao

Azpúrua³

et al. 2023

IEEE Trans. Electromagn. Compat.

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The electromagnetic characterization of reaction wheels is crucial to comply with the demanding ac magnetic field cleanliness requirements of space science missions, thus, preventing interference on sensitive onboard instrumentation. Therefore, a complete assessment, including the measurement of the magnetic flux vector at different operational modes and under dynamic conditions, is proposed as a contribution beyond conventional testing methodologies. This article investigates the worst-case magnetic field emissions experimentally, using a test setup based on a multichannel acquisition and multidomain postprocessing system. The focus of the measurement campaign was on the low-frequency range (10 Hz-2 kHz). Moreover, capturing the B-field in the timedomain enabled further analysis, that is, complementary outputs for understanding the electromagnetic performance of the reaction wheel. As a result, we can relate the wheel rotation with the current and the magnetic fields, compute the field orientation, and evaluate in-band interference for the magnetic field.

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