Permanent magnet biased magnetostrictive transducer
US4703464A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 10, 1985 |
| Grant date | Oct 27, 1987 |
| Priority date | — |
| Expiry date | May 10, 2005 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04R15/00
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A transducer which uses paramagnetic magnetostrictive rods or bars, e.g., compositions of the lanthanide series of elements such as Tb.sub.0.3 Dy.sub.0.7 Fe.sub.2, has the bars biased with a lengthwise flux by a permanent magnet, e.g. samarium-colbalt, of high resistance to demagnetization by the alternating field applied to the bars by alternating current in a coil surrounding the bar. The magnet is outside the coil to reduce the ac field to which it is subjected. Uniformity of flux density along the length of the bars is enhanced by having adjacent ends of the bars subjected to like-polarity poles of the permanent magnets associated with each bar.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.