Magnetostrictive actuator
US6891286B2 · kind B2 · utility
Inventors
Key dates
| Filing date | Aug 6, 2004 |
| Grant date | May 10, 2005 |
| Priority date | — |
| Expiry date | Aug 6, 2024 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04R2460/13
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A magnetostrictive actuator comprises a rod of giant magnetostrictive material, biasing permanent magnets arranged at each end thereof and coaxially therewith so as to pass a magnetic field through the rod. An energizing electromagnetic coil is connected to an energizer so as to superimpose on the magnetic field passing through the rod an alternating magnetic field to cause variation in the length of the rod in response thereto. The permanent magnets are each in the form of a disc having a cross-sectional area substantially greater than that of the rod and are spaced from the ends of the rods by material of low magnetic permeability. The magnetic field in the rod is thereby substantially linear along the length thereof.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.