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Vertical-axis wind turbines (VAWTs)

on Tuesday, 20 September 2011.

Vertical-axis wind turbines (VAWTs) is a wind turbine where the shaft is vertical as opposed to horizontal. Usually the generator is located at it's base.

 

vawt1

Advantages:

Generators and gearboxes are close to the ground for ease of maintanance

VAWTs are omni-directional so do not need to be pointed into the wind.

Transverse axis wind turbine (TAWT)

A VAWT tipped sideways with the shaft axis horizontal  o the ground, opperates in the same way.

windturbines

Advantages of vertical axis wind turbines

  • They are not subject to the minimum distace rules applied to Horizontal Axis Wind Turbines (HAWT).
  • VAWTs are rugged, quiet, omni-directional, and they do not create as much stress on the support structure.
  • They have a very low starting torque.
  • They do not require as much wind to start generating power.
  • Easier to maintain.

Disadvantages of vertical axis wind turbines

  • Tendency to stall under gusty winds.
  • The VAWTs are not efficient in high wind speed environments.
  • The blades can be prone to fatigue
  •  Limited to operation in relatively low wind speeds.

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