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:
Feb. 12, 2013
Filed:
Apr. 20, 2011
Applicants:
Stephan Engelhardt, Sonsbeck, DE;
Lars Kock, Krefeld, DE;
Inventors:
Stephan Engelhardt, Sonsbeck, DE;
Lars Kock, Krefeld, DE;
Assignee:
Woodward Kempen GmbH, , DE;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
F03D 9/00 (2006.01); H02P 9/04 (2006.01);
U.S. Cl.
CPC ...
Abstract
A protection system for a doubly-fed induction machine; with a stator and a rotor. The stator of the doubly-fed induction machine is connected to a grid, and the rotor of the doubly-fed induction machine is connected to the grid via a converter. The converter includes a machine side converter, and a DC-link and a line side converter. The protection system also includes at least one crowbar, the crowbar being connected to the rotor, at least one DC-chopper provided in the DC-link, a converter controller, and a separate protection device for DC-chopper and the at least one crowbar.