Emergency-powered pitch drive device for a wind or hydroelectric power plant

摘要

Emergency-operated pitch drive device (10) for adjusting a rotor blade of a wind or hydropower plant comprising a three-phase motor, an inverter device (14) and a DC electrical energy storage device (20), characterized in that the three-phase motor is an IPM (Interior Permanent Magnets) (12 ), and the DC voltage energy storage device (20) in both normal and emergency directly to a direct current DC link (18) between a rectifier device (16) and the inverter device (14) for at least short-term power supply of the IPM synchronous motor ( 12) is switched, so that the IPM synchronous motor (12) can be operated speed controlled at least in the short term even with a sinking DC link voltage UZK.