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United States of America Patent
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Issued Date -
Jun 18, 2020
app pub date -
Dec 16, 2019
filing date -
Dec 17, 2018
priority date (Note) -
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Abstract
An actuator comprises a magnetostrictive element operably connected to a solenoid coil, preloaded to a default length, having an expanded length greater than the default length, and having a compressed length less than the default length. The compressed length of the magnetostrictive element is not less than a length at which permanent mechanical degradation of the magnetostrictive element occurs. An output element is disposed proximate to a terminal end of the actuator and movable between an original position and an actuated position. The coil can be energized or deenergized between a lower level and a higher level for part or all of an expansion or compression of the magnetostrictive element anywhere within the range between the compressed length and the expanded length. The magnetostrictive element can comprise a terbium alloy.
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