Wind-driven generator apparatus and method of making blade suppo

Details Wind-driven generator apparatus and method of making blade suppo Wind-driven generator apparatus and method of making blade suppo

1979-05-10

1982-12-28

Truhe, J. V.

Prime-mover dynamo plants

Fluid-current motors

Wind

290 44, 416132B, 416141, 416140, 416226, 307 87, F01D 514, F03D 704, H02J 308

Patent

active

043663877

ABSTRACT:
Wind generator apparatus employs an induction generator with a wind-driven rotor. Connection of the induction generator to AC power lines is controlled by apparatus that compares generator rpm and line frequency. The rotor blades have a pretwisted, varying-chord inboard portion and an untwisted, constant-chord outboard portion. The blades are self-starting, operate efficiently over a range of wind speeds with constant pitch maintained by a torsional biasing mechanism, and pitch up automatically when the normal rpm operating range is exceeded. An improved blade-supporting spar of low torsional stiffness has an I-beam configuration with filament-wound flanges. A pitch damper prevents torsional oscillations while permitting the blades to pitch up readily. The rotor, which includes a teetering hub, is free to weather-vane about the axis of a supporting tower, but a yaw damper limits angular velocity. A guy wire and gin pole arrangement stabilizes the tower and permits easy raising and lowering of the tower.

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