Yaw drives from Germany-based ABM Greiffenberger, Milford, Ohio, maintain nacelle positions into the wind to maximize energy generation. The drive uses a combination of induction motors and multi-stage planetary gearboxes. High grade components, most manufactured in-house, and durable roller bearings ensure maximum life with minimal maintenance. High torsion resistance maintains an exact position even in high wind gusts. Motor outputs range from 2.2 to 22 kW and gearboxes come in ratios from 100 to 2,000. Drive systems have output torque ratings from 2,000 to 50,000 Nm and maximum output torques of up to 100, 000 Nm. The units work at temperatures as low as – 40C.
Drives for wind turbines also run quietly with high overload capacity. Drives allow easy oil changes even in adverse conditions such as the high altitudes of a wind turbine tower.