The Windbelt – a Cheap Wind-Power Generator

dominique_cimafranca writes "Shawn Frayne, a 28-year old inventor, has developed a small wind-powered generator that can be used to power small appliances in developing countries. Unlike the typical propeller design one expects of wind generators, the windbelt uses the oscillation of a membrane that follows the vibration of bridge. The oscillation drives small magnets which generate the electricity. From the article: 'Frayne's device, which he calls a Windbelt, is a taut membrane fitted with a pair of magnets that oscillate between metal coils. Prototypes have generated 40 milliwatts in 10-mph slivers of wind, making his device 10 to 30 times as efficient as the best microturbines. Frayne envisions the Windbelt costing a few dollars and replacing kerosene lamps in Haitian homes.'"

Comments

Re:Math for scaleup...

[GameMaster]

Ah, yes. But if you were actually a member of his target audience (dirt poor people in countries like Haiti making $2-$4 per day) then you couldn't afford that fancy $3000 turbine in your wildest dreams. Smaller, more affordable turbines grow dramatically less efficient due to friction forces at small sizes. In order to actually make your point valid, you'd have to find a wind turbine of the same wattage range that is cheaper.

The whole point here is very specific. Poor people, like the ones in Haiti don't have many things that need electricity. The problem is, the only source of light they have is fire based causing an increases risk of burning to death in a hovel fire. The problem is compounded by the fact that third world shanty towns usually don't have much in the way of municipal fire codes. Assuming LED bulbs come down in price far enough (which the look to do eventually) they have the energy efficiency needed to run off this thing, the ruggedness to last in that kind of environment, and the long life to make themselves truly economical. They could, completely, replace oil lamps, candles, and other fire based light sources. It has the added bonus of eliminating one of the motivating factors in the deforestation of Haiti, which, in turn, is one of the reasons they've had such horrible flooding in this last hurricane.

This thing still has a lot of things to prove before it can be said to be useful (durability is one of them) but cost/watt isn't an issue for the application being envisioned. As for first-world applications he can use to fund his third-world goal, he just has to look long enough for similar places where a microturbine might have, otherwise, been the only option.

Focus on the developing world uses.

[RustinHWright]

I know that he talked about scaling up. Put that down to usual inventor exuberance. All of us who've gotten an invention working have experienced that. What matters is that is entire apparatus of about ten parts can be built of scrap, in a couple of hours.

Yeah, sure, he's using optimized materials. But anything thin and flexible could be tested, have its optimal shape for flutter in a given environment determined, and used to make these. I knew some guys who did the sensors for their thesis using strips of mylar from potato chip bags.
Magnets are the one hard part and even those can be pulled from dead speakers or whatever.
Wound wire? We've all built our own generators as kids, yes? Winding enough for an electromagnet like that is no big deal. And wire turns up in waste streams all over the place. That's why so many baskets and such from rural craftspeople are made of it.
Rigid frame? Whatever's around. I'm not entirely sure just how rigid that frame needs to be but worst case scenario we're talking about a chunk of iron cut out of a dead car.
And so on.

What this does is enable illiterate people with a few hours of training to make a device from things they don't have to pay for that can power basic things like lights. And from what I'm seeing, it's the kind of thing that will propagate. UNESCO staffer teaches Jose. Jose's brother comes by and asks about it; Jose teaches his brother. Brother's wife wants one to sew better; she makes one for herself. The wife's friends drop by . . .

Excellent. All we need to do is provide superbright LEDs and whatever parts turn out to most be in demand and soon, count on it, there will be innovations by the dozens turning up that the inventors and NGO folks never even knew about.