Actuating drive and emergency energy supply device

US7566981B2 · kind B2 · utility

Assignee

• Bosch Rexroth Corporation · DE

Inventors

• Steffen Kunkel · Eitorf, DE
• Karl-Günter Herrmann · Karlstadt, DE
• Michael James Horning · Landisville, US
• Berno Kobelbauer · Nieder-Olm, DE
• Jorg Dantlgraber · Lohr am Main, DE
• Stephan Becker · Marburg, DE
• Gunther Neidlein · Lohr am Main, DE
• Bernd Schnurr · Lohr am Main, DE

Key dates

• Filing date: Jun 29, 2006
• Grant date: Jul 28, 2009
• Expiry date: Apr 4, 2027

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02E10/76
• WIPO field: Electrical machinery, apparatus, energy
• WIPO sector: Electrical engineering

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.