Wind Mill Designing with Permanent Magnet Generators -III
In this post we will discuss two features of windmill installation; Speed And Temperature. These play very important role in deciding what will the output be. Following two notes on these factors will give a good idea regarding these considerations.
Speed
- Start-up Speed– The speed at which the blades begin to rotate.
- Cut-in Speed – The minimum speed at which the turbines begin producing electricity.This factor will depend on the wind permanent magnet alternator.
- Rated Speed – The rated speed is the minimum wind speed at which the wind turbine generates its designated rated power. For example, a “10 kilowatt” wind turbine may not generate 10 kilowatts until wind speeds reach 25 mph. Rated speed for most machines is in the range of 25 to 35 mph.
- Cut-out Speed – At very high wind speeds, typically between 45 and 80 mph, most wind turbines cease power generation and shut down. The wind speed at which shut down occurs is called the cut-out speed, or sometimes the furling speed. Having a cut-out speed is a safety feature which protects the wind turbine from damage. Shut down may occur in one of several ways.
Temperature
Utility-scale wind turbine generators have minimum temperature operating limits which apply in areas that experience temperatures below –20 °C. Ice accumulation should always be avoided.
