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:
Jun. 05, 2012
Filed:
Mar. 04, 2009
David Reginald Trainer, Derby, GB;
Harsh Agarwal, London, GB;
Stephen Mark Husband, Derby, GB;
Gareth Edward Moore, Nottingham, GB;
David James Powell, Sheffield, GB;
Stephen Andrew Long, Carmel, IN (US);
David Reginald Trainer, Derby, GB;
Harsh Agarwal, London, GB;
Stephen Mark Husband, Derby, GB;
Gareth Edward Moore, Nottingham, GB;
David James Powell, Sheffield, GB;
Stephen Andrew Long, Carmel, IN (US);
Rolls-Royce PLC, London, GB;
Abstract
Electrical machine arrangements have advantages with regard to providing local electrical power and starting. Embedding such electrical machine arrangements in machinery such as gas turbine engines is advantageous in removing mechanical linkages and reducing aerodynamic drag. However, the components utilized must be able to withstand harsh environmental conditions and therefore the DC link capacitor used for smoothing of voltage fluctuations are limited to relatively low capacitance densities. Low density DC link capacitors require large sizes which render electrical machines less acceptable for embedded usage. By providing offset of electrical current in inductance elements such as stator windings and stator coils of electrical machines in dead periods of the cycle a reduction in DC link capacitor requirements is achieved reducing the size, weight and complexity of installing electrical machines in gas turbine engines.