Yawing system for a wind mill

Details Yawing system for a wind mill Yawing system for a wind mill

1989-09-12

1991-07-30

Kwon, John T.

Fluid reaction surfaces (i.e., impellers)

With means positioning fluid current driven impeller...

416 14, 416169R, F03D 704

Patent

active

050355759

ABSTRACT:
A yawing system for a wind mill consists of two yawing motors (9, 11) acting on a toothed rim of the yawing bearing. On each its drive shaft (21) the motors (9, 11) are provided with a free wheel (23) and an electromagnetic friction brake (25). The free wheel devices (23) are directed opposite each other. A control system operates in a passive state in such a manner that the motors give opposite and relative to the braking moment of the brake (25) of a second motor smaller torque thereby avoiding dead clearance between drive wheel (15) and toothed rim (17) while at the same time keeping the generator housing (5) of the mill at rest. In the active state of the control system both brakes (25) are disengaged and both motors give a higher torque in the same direction. The system acts as a shock absorber by loads exceeding the fixed slip moment of the friction brake (25).

REFERENCES:
patent: 4527072 (1985-07-01), van Degeer
patent: 4557666 (1985-12-01), Baskin et al.
patent: 4966525 (1990-10-01), Nielson

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