As the wind blows, it spins the fan blades and a tiny generator to which they're attached, which works a bit like a bicycle dynamo. Some anemometers have what looks like a small fan in place of the cups or propeller. Like miniature wind turbines, they use small propellers to power their generators instead of spinning cups. Propeller anemometers work in much the same way. On top of the axle, there are several large cups that catch the wind and make the generator spin around.
They're little more than an electricity generator mounted in a sealed-up metal cylinder with an axle protruding upward from it. Some of the simplest anemometers work in exactly this way. You figure out the mathematical relationship between wind speed andĮlectric current so you could figure out the speed of an unknown wind Much current is generated by a few winds of known speed. Instrument like this before you use it, of course.
So if you measure the current, you have a basic way of measuring the Motor wired up backwards so it makes an electric current when you spin its centralīlades turn, the quicker the generator spins, and the higher the electric current it will produce. Suppose you build yourself a miniature, table-top wind turbine andĬonnect it to an electricity generator (effectively an electric But it's certainly true that wind turbines turn Turbines are fitted with brakes that stopīlows too hard (and they have built-in anemometers to measure the speedĪs well). Unsafe because gales and storms could make them Why you can't always measure things precisely.
0 kommentar(er)
