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:
Nov. 21, 2006
Filed:
Mar. 24, 2005
John James Anthony Cullen, Derby, GB;
Cerith Davies, Derby, GB;
John Richard Webster, Derby, GB;
Rolls-Royce PLC, London, GB;
Abstract
With an active magnetic bearingthere is a limit to the available rapidity of response to transient loadings upon a target or rotor. Thus, in accordance with the present invention, storage deviceshold an electrical voltage VS significantly greater than the normal supply voltage V provided by a normal electrical source. In such circumstances when a very large transient loading is detected on the bearinga switchdischarges the supply voltage VS across the coilin order that a more rapid increase and higher value inductance current IT is presented to the coilin response to that variable loading upon the target/rotor. The electrical discharge from the storage devicecan be adjusted using the switchor mixing the storage devicesas required for an appropriate discharge signal shape. Generally, the active magnetic bearingis controlled by a controller device which monitors target/rotorposition in order to determine transient loading and therefore switching of the storage device