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:
Jul. 28, 2009
Filed:
Jun. 29, 2006
Steffen Kunkel, Hösbach, DE;
Karl-günter Herrmann, Karlstadt, DE;
Michael Hörning, Triefenstein, DE;
Berno Kobelbauer, Gössenheim, DE;
Jörg Dantlgraber, Lohr am Main, DE;
Stephan Becker, Groβostheim, DE;
Gunther Neidlein, Lohr am Main, DE;
Bernd Schnurr, Lohr am Main, DE;
Steffen Kunkel, Hösbach, DE;
Karl-Günter Herrmann, Karlstadt, DE;
Michael Hörning, Triefenstein, DE;
Berno Kobelbauer, Gössenheim, DE;
Jörg Dantlgraber, Lohr am Main, DE;
Stephan Becker, Groβostheim, DE;
Gunther Neidlein, Lohr am Main, DE;
Bernd Schnurr, Lohr am Main, DE;
Bosch Rexroth AG, Stuttgart, DE;
Abstract
An actuating drive for a rotor blade in a wind power installation is provided with an electric motor and a frequency converter which has a rectifier that is to be fed from a power supply system, a link connected to the rectifier, and a d.c.-to-a.c. inverter for feeding the motor, the link carrying a specified nominal operating voltage in a network-fed normal operation of the frequency converter. Furthermore, an auxiliary energy supply device is provided that is connected to the link. The auxiliary energy supply device includes and energy store which makes available a support voltage that amounts to less than 80% of the nominal operating voltage of the link. A diode is connected between the energy store and the link, and is arranged, with regard to its forward direction, in such a way that it feeds a support voltage from the energy store into the link if the link voltage falls below the support voltage. The diode prevents a current flow between the energy store and the link if the link voltage is greater than the support voltage. A charging device for the energy store has a lower charging voltage than the nominal operating voltage of the link.