2007-06-14 01:50:52 · 5 answers · asked by Gladys R 1 in Science & Mathematics ➔ Engineering
Could you mean to energize the magnets in the generators and power the tracking systems? I'd guess some of the smallest ones use permanent magnets and passive (tail fin) tracking. The largest ones feed power to the "grid" and can receive power from it at startup, for powering the control systems and field magnets. As far as turning the blades, that is what the wind does.
2007-06-14 02:07:52 · answer #1 · answered by tinkertailorcandlestickmaker 7 · 0⤊ 0⤋
The working fluid for windmills is air.
When air moves quickliy in the form of wind it has kinetic energy.
This kinetic enery of the wind is captured by blades of the windmill which cause it to rotate.
This rotational enery is transferred with the help of shafts to a generator which converts it into electricity.
Thus for a windmill to start running you just need wind strong enough to pust the turbine blades and make it rotate (basically it means transfer its kinetic energy)
2007-06-14 09:02:28 · answer #2 · answered by shrikant s 2 · 0⤊ 0⤋
They are either designed with high torque at low speed (through variable pitch on the propellers), or the load is removed, mechanically or electrically, until the windmill gets up to full speed (then the load is applied).
Usuallly the load is applied after full speed is achieved.
.
2007-06-14 09:02:35 · answer #3 · answered by tlbs101 7 · 1⤊ 0⤋
um, the wind. Hence the name. That's why there's those big ol' propeller looking things on them.
2007-06-14 08:58:49 · answer #4 · answered by auntcookie84 6 · 0⤊ 0⤋
From the wind âº
Doug
2007-06-14 09:42:09 · answer #5 · answered by doug_donaghue 7 · 0⤊ 0⤋