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. 30, 2004
Filed:
Nov. 18, 2002
Jason E Hill, Newcastle upon Tyne, GB;
Steven J Mountain, Auckland, NZ;
Alan J Mitcham, Ponteland, GB;
Rolls-Royce plc, London, GB;
Abstract
A permanent magnet fault tolerant generator is driven by a variable speed shaft to create AC power at terminals , converted at to DC power before being applied to a load . The converter is a bi-directional device which rectifies AC to DC and also acts as an inverter to synthesize AC from the DC. This synthesized AC waveform is imposed on the terminals to maintain a constant magnitude generator output voltage, regardless of the speed of the shaft , and thus regardless of the EMF of the generator. This results in reactive currents flowing between the generator and the converter , but allows the generator design have a reduced current rating, resulting in improved generator size and weight.