NORWIN 29-STALL-225 - “Stall Control” power control system

A “stall control” power control system was chosen for these turbines. This is a simple mechanical power control system that allows us to keep the price affordable. Stall control is a passive way of limiting the power produced by the turbine during strong winds. When the wind rises above a certain speed, the blade starts to stall, and loses some of the lift that drives the rotor, and thus reduces the power output from the turbine.

The stall control method lacks several of the advantages of the active stall regulation method (ASR) used in the larger size Norwin turbines but it is important to keep building and maintenance costs at a minimum for these smaller size Norwin turbines. The benefits from ASR are more apparent for the larger size turbines and can justify the additional installation and maintenance costs for those systems.