Contraction type actuator

Details Contraction type actuator Contraction type actuator

2007-03-27

2007-03-27

Mullins, Burton (Department: 2834)

Electrical generator or motor structure

Dynamoelectric

Reciprocating

Reexamination Certificate

active

10536309

ABSTRACT:
A contraction type actuator10is provided which can efficiently and evenly apply a bias magnetic field to a magnetostrictive rod to obtain a large contraction amount, while having a small and simple structure.In the contraction type actuator10, a giant magnetostrictive rod12flexibly expands and contracts by controlling the strength of a magnetic field applied by a magnet coil14. A bias magnet comprises a first bias magnet16and a second bias magnet18. The fist bias magnet16in an approximately cylindrical shape is coaxially disposed around the giant magnetostrictive rod12. The second bias magnet18is disposed in the inner space16A of the first bias magnet16, and is polarized in the direction of drawing a part of a magnetic field generated by the first bias magnet16into the inner space16A.

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