KINEMATICS OF THE CENTRIFUGAL MECHANISM FOR
PROTECTION AT OVERSPEED OF THE LOW POWER WIND
ROTOR TURBINE
Rotor over speed protection for small wind turbine power requires a cheap
and reliable mechanical system as possible. This is because any electric or
electronic device depends on the electrical power source that becomes
unavailable in disaster conditions. Of these, centrifugal mechanism is priced at
acceptable cost, but contains some subtleties of interpretation of the operation
mod. In terms of kinematics, centrifugal mechanism is reduced to a crank and
connecting-rod assembly with sliding piece. This paper presents schematically
this mechanism and the elements that govern the movement of the sliding
piece: race, speed and acceleration.
The mechanism function is alternative to a crank angle range of α =
0°…45°. Sliding piece is operated offset from the sliding axis. The complexity
consists in the fact that each blade is attached to the single sliding piece
through a rod and a crank. Thus the three rotor blades rotate simultaneously by
the cumulated action of the centrifugal force that occurs due to the rotating
counterweights.
Keywords: wind turbine, slide race, speed, acceleration, crank and
connecting-rod assembly
Cuvinte cheie: turbină eoliană, cursa culisei, viteza, accelerația, mecanism
bielă-manivelă
