On 19/01/12 18:57, Harold Hallikainen wrote:
> I've always thought 3 phase motors were interesting. It'd be interesting
> to put one on a windmill with a variable pitch prop. With no wind, the
> device is a fan, consuming electric power. With wind, if the speed is the
> same as the synchronous speed (typically 1800 RPM for 60Hz), no power is
> consumed. Above synchronous speed, it's a generator dumping power back
> into the line. It's a simple self synchronizing system.
>
> Harold
>
** Re: the original device in the thread...
Where is a consumer watchdog when you need it?
How many people not knowing what or where to ask - much less having a=20
working knowledge of the physics involved - get hoodwinked by snake oil=20
like this?

** Re: wind generation
Here is a link to an article where someone is 'doing just that' (Well,=20
with a water turbine though)

http://www.sustainableplant.com/2011/06/small-scale-hydroelectric-plant-pro=
mises-profit/

"The hydroelectric system is powered by water draining from the lake=20
that flows through a turbine which, in turn, drives three generators via=20
a belt and pulley system (Figure 2). The generators are actually three=20
Baldor Electric model L1177T 15hp single-phase induction motors.

When an induction motor is driven at greater than normal speed, it=20
generates electricity. Output from the three motors was tied into the=20
local electric grid via the same transformer that formerly only provided=20
power to the property. The utility=92s meter now turns backwards when the=20
plant is supplying more power than consumed by the home and office"

Eoin


--=20
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