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:
Oct. 08, 2002
Filed:
Feb. 28, 1997
Malcolm A Swinbanks, Cambridge, GB;
Abstract
An electro-magnet ( ) is spatially coupled with respect to a support armature ( ) by an operational gap ( ) and their relative movement is automatically compensated by controlling a current ( ) supplied to the electromagnet ( ). The current ( ) and hence a magnetic field (F) are controlled by a current controller ( ) which incorporates a transfer function and is operated in a feedforward path ( ) by a signal ( ) from a sensor ( ) which detects variations in the gap ( ) between the electro-magnet ( ) and the support armature ( ). The current controller ( ) is also operated in a feedback path ( ) by a signal ( ) from a sensor ( ) which detects variations in the flux intensity of the magnetic field (F). The operation of the current controller ( ) by the sensors ( and ) controls the force by which the support armature ( ) is attracted towards the electro-magnet ( ), while maintaining the gap ( ) at a desired value and inhibiting the transmission of vibration between the support armature ( ) and the electro-magnet ( ).