A site for the DIY enthusiast, little less pricey, is otherpower.com,
where you can get complete instruction for converting wind to
electricity, with come novel ideas on using items that are of no longer
of use as they were intended, but become recycled into something else
useful!
Read that page carefully! It says the alternator can produce 12
Kwat 18,000 RPM!!! Good luck spiniing that thing that fast.
I'm sure the bearings would catch fire if the whole thing doesn't
explode first. Speeds that high require incredible balancing and air
bearing spindles.
Joe Street wrote:
Read that page carefully! It says the alternator can produce 12
Kwat 18,000 RPM!!! Good luck spiniing that thing that fast.
I'm sure the bearings would catch fire if the whole thing doesn't
explode first. Speeds that high require incredible balancing and air
Joe,
How much are they spinning in a car? To me it looks like the wheel on
the alternator is much smaller than the wheel on the car engine,
could it be 1 to 4 or more? 4,000 rpm for the car engine is quite
usual, so the alternator can not be far from 18,000 in normal
conditions. Just a
Hi Hakan;
I bet the pulley on the crankshaft is less than twice the alternator's
pulley diameter. Also the amount of time your engine is reving above
2500 rpm is short compared to the normal. Anyways they talk about low
losses but the gearbox required to turn the alternator that fast would
Joe,
Twice the diameter, would be close to 1 to 4, right (THE SQUARE OF
2)? Agree that 2,500 might be close to normal speed. That would be
something like 10,000 rpm for the alternator at normal speed. Talking
about that the alternator would explode at 18,000 rpm is maybe an
overstatement?
Hi Hakan;
If the diameter of the pulley is doubled the circumference is doubled.
Not 4 times. You must be thinking of area. Now if you double the
diameter on a wind turbine you do get 4 times the power. Is this what
you were thinking of? If a 3 meter turbine produces 1kw ( a safe
guess
Joe,
Yes I got messed up with language, circumference, area and wind
speed, because circumference is not really interesting. Regarding
relations between area and wind speed, you have a table on my site.
If you double the circumference the area goes up with the quadrate
and if you double the
Commercially produced microturbines typically run at 20,000rpm or higher (I
think some are 100,000rpm). Check out Capstone's website
http://www.microturbine.com/prodsol/techtour/index.asp Perhaps that
alternator is made for that but probably not.
On 12/8/06, Hakan Falk [EMAIL PROTECTED]
Hi,
to my mind, a car alternator will rev about 2-4 times the engine revs. The
size of the alternator pulley is about 50mm the crank pulley is 100-125mm.
This gives 2+. A car alternator will rev fairly high, because the rotor
diameter is only small: about 80mm from guess.
Usually the slower
automotive alternators run at 2 to 3 times crank speed. Look at the relative
size of the pulleys.
Kirk
Hakan Falk [EMAIL PROTECTED] wrote:
Joe,
Yes I got messed up with language, circumference, area and wind
speed, because circumference is not really interesting. Regarding
relations
http://www.hydrogenappliances.com/powerpmas.html
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