The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 07, 1989
Filed:
Mar. 15, 1988
Goran Engdahl, Taby, SE;
Asea Brown Boveri AB, Vaster.ang.s, SE;
Abstract
An electrically controlled spring element according to the invention comprises one or more basic spring elements and a mechanical transformer to increase the stretch of the spring element. The basic spring element comprises two mechanically connected elements with an intermediate transmission for power output, each of the elements consisting of a rod pre-magnetized by permanent magnets and consisting of highly magnetostrictive material (Terfenol), a surrounding excitation coil and an outer frame holding the parts together. The magnetic orientation of the pre-magnetization and the coils shall be such that, regardless of the direction of the control current, the electrically controlled excitation is always directed in the same direction as the pre-magnization in one element and is always directed in the opposite direction to the pre-magnetization in the other element.