| Various
Technologies in Wind Turbines |
| AXIS |
Vertical |
Horizontal |
| DIRECTION |
Upwind |
Downwind |
| BLADES |
Three |
Two |
| SPEED |
Constant |
Variable |
| REGULATION |
Stall |
Pitch |
| GENERATOR
WINDING |
Single |
Double |
| GEAR |
With
Gear |
Gearless |
| ELECTRONICS |
Direct
AC |
AC-DC-AC |
| DIRECTION |
Vertical |
Horizontal |
Omni directional
No
yawing required
Drive train at ground level
Blades
without twist or taper
Support at both ends, so lower
stresses
|
 |
Guyed configuration has
limitation in height; not self starting, motor starting. |
| UPWIND |
 |
DOWNWIND |
Give
Lower Noise / Turbulence.
No
Tower Shadow on Blades, Thus Avoid Fatigue Loads on Blades. |
Naturally
Yaws in the Wind Direction. Avoids Complicated and Costly Active
Yaw. |
| TWO |
 |
THREE |
Cheaper,
lighter, operates at high speeds leading to transmission costs,
easier to install.
Higher
speed sop greater loading, thus more noise. |
Less
cyclical load, dynamic or gyroscopic imbalance of 2 bladed WTGs with
change in wind direction. |
|
