Windmill speed limiting system utilizing hysteresis

Details Windmill speed limiting system utilizing hysteresis Windmill speed limiting system utilizing hysteresis

1981-05-21

1983-02-22

Powell, Jr., Everette A.

Fluid reaction surfaces (i.e., impellers)

With means moving working fluid deflecting working member...

416 44, 416 89, F03D 704

Patent

active

043746314

ABSTRACT:
A windmill speed limiting device is provided to prevent the windmill blades from going too fast during conditions of heavy winds. In order to slow down the windmill blades, the tips of the blades are turned relative to the main blade portion at high speeds. After the tips are turned, the windmill blade must return to a safe speed before the tips are returned to their normal position. A hysteresis effect by which the tip portions are rotated to their normal angular position in alignment with the main blade portion is implemented by means of a cam track, a pivot point below the center of the blade and a central spring loaded drum to which each of the blades are connected.

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patent: 4257736 (1981-03-01), Jacobs
patent: 4297076 (1981-10-01), Donham et al.

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