"Zero-power" positioning actuator for cryogenic environments by combining magnetostrictive bimetal and HTS

Mojtaba Ghodsi, Toshiyuki Ueno, Hidekazu Teshima, Hosei Hirano, Toshiro Higuchi, Eric Summers

Research output: Contribution to journalArticle

22 Citations (Scopus)

Abstract

This research presents a novel "zero-power" actuator for cryogenic conditions by combining a magnetostrictive bimetal with a bulk high temperature superconductor (HTS) sample. This actuator is based on two phenomena; "pinning effect", and "magnetostrictive bimetal". The relationship between displacement of actuator and applied current was measured when the thickness of the HTS samples was 1, 2, and 3 mm. It was found that because of pinning effect part of the magnetic flux (energy), generated by the coil can be trapped (stored) in the HTS samples. Consequently, the actuator can be held in the desired position when its power is switched off. "Holding range" of actuator is directly proportional to the thickness of the HTS samples. The holding range of 4.5 μm for 1 mm thickness of the HTS increases to 12 μm for 3 mm thickness. The controllability of the actuator over its holding range was also demonstrated.

Original languageEnglish
Pages (from-to)787-791
Number of pages5
JournalSensors and Actuators, A: Physical
Volume135
Issue number2
DOIs
Publication statusPublished - Apr 15 2007

Fingerprint

bimetals
Bimetals
High temperature superconductors
high temperature superconductors
Cryogenics
positioning
cryogenics
Actuators
actuators
controllability
Magnetic flux
Controllability
magnetic flux
coils

Keywords

  • Cryogenic environments
  • Galfenol
  • High temperature superconductor
  • Magnetostrictive bimetal
  • Pinning effect
  • Zero-power

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Mechanical Engineering
  • Instrumentation

Cite this

"Zero-power" positioning actuator for cryogenic environments by combining magnetostrictive bimetal and HTS. / Ghodsi, Mojtaba; Ueno, Toshiyuki; Teshima, Hidekazu; Hirano, Hosei; Higuchi, Toshiro; Summers, Eric.

In: Sensors and Actuators, A: Physical, Vol. 135, No. 2, 15.04.2007, p. 787-791.

Research output: Contribution to journalArticle

Ghodsi, Mojtaba ; Ueno, Toshiyuki ; Teshima, Hidekazu ; Hirano, Hosei ; Higuchi, Toshiro ; Summers, Eric. / "Zero-power" positioning actuator for cryogenic environments by combining magnetostrictive bimetal and HTS. In: Sensors and Actuators, A: Physical. 2007 ; Vol. 135, No. 2. pp. 787-791.
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