| US 7,513,742 B2 | ||
| Pitch drive system for a wind turbine | ||
| Peter Rogall, Emsburen (Germany); and Patrick Achenbach, Rheine (Germany) | ||
| Assigned to General Electric Company, Schenectady, N.Y. (US) | ||
| Filed on Oct. 14, 2005, as Appl. No. 11/250,748. | ||
| Claims priority of application No. 04024520 (EP), filed on Oct. 14, 2004. | ||
| Prior Publication US 2006/0083615 A1, Apr. 20, 2006 | ||
| Int. Cl. F03D 7/00 (2006.01); F03D 7/02 (2006.01) | ||
| U.S. Cl. 416—47 [416/155] | 15 Claims |
| 1. A pitch drive system for a wind turbine, comprising:
a regulation drive for regulating the pitch of a rotor blade of the wind turbine during normal operation, the regulation drive
comprising at least one drive train and first and second motorized actuators;
an emergency drive for pitching the rotor blade in case of emergency, the emergency drive comprising at least one drive train
and an actuator having a mechanical energy storage element; and
wherein the at least one drive train of the emergency drive is separate from the at least one drive train of the regulation
drive.
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