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:
Dec. 01, 1987
Filed:
Dec. 03, 1986
Philip A Studer, Silver Spring, MD (US);
Other;
Abstract
A single degree of freedom suspension element exhibiting substantially zero natural frequency of vibration with electronically controllable response comprising the combination of a mechanical spring and an 'electromagnetic spring' which axially supports a mass located on a base. The electromagnetic spring includes two identical and symmetrical permanent magnet circuits having adjacent like-polarity poles joined by a permeable magnetic shunt member. The magnet circuits include an air gap between pairs of pole faces and within which prominences of a magnetically permeable armature extend therein and partially short each of the air gaps. An electromagnetic coil is located inwardly of the magnetic shunt between the magnetic circuits and encircles the armature between the prominences. The mechanical spring is coupled to the armature and acts to center the prominences in the air gap. Motion of the armature induces currents in the coil which are velocity dependent and opposed to the motion, yielding a viscous damping effect. Energization of the coil results in a differential magnetic flux in the air gaps, producing differential forces tending to move the armature in a predetermined axial direction.