Vertical Axis Wind Generator
6 February 2010
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Vertical Axis Wind Generator or Vertical Axis Wind Turbine (VAWT) is a type of wind turbine that has its rotor shaft position vertically. VAWTs do not need for towers because of this arrangement; generator and gear box are placed near ground level, which is more accessible for maintenance. VAWTs can also utilize wind from any directions. Drawbacks of VAWTs are some design produce pulsating pulse, affects reliability. Wind speeds are more slower at near ground level, so less energy is available to be harnessed by the turbine. Air flow near ground level and other objects can produce turbulent flow, which creates vibration, noise, and bearing wear which lowers reliability of the turbine. However when mounted on top of buildings, this can double the speed as the building redirects wind over the roof.
VAWT advantages:
- A large tower is less generally needed, VAWTs has mounted near ground level and roof tops.
- Models without yaw apparatus are plausible with secured pitch rotor concepts.
- VAWTs are located near ground level, which is more accessible for maintenance.
- VAWTs have lesser startup wind speeds. They can start generating electrical energy at around 6 mp/h (or 10 km/hr)
- VAWTs can be erected at locations where taller structures are not allowed.
- VAWTs tend to create lower noise.
VAWT disadvantages:
- VAWT are less efficient compared to the other type of wind turbine, because of further drag that is created when the blades rotate.
- VAWTs uses guy-wire to secure it, this places strain on the base bearing because the entire mass is on the bearing.
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Thanks for the useful info. It’s so interesting
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