A Hand Cranked MagnetoGenerator

"Randy Gross" <aaawelder@yahoo.com> wrote in message
news:xn0e62b099nyli000@news.east.earthlink.net...
default wrote:

snip

http://www.otherpower.com/pmg2.html Interesting low speed homemade
wooden alternator. He could probably more than double the output if
he mixed some powdered iron in his epoxy on the field coils. Claims
it can power a 120 volt tube type stereo that dissipates 300 watts,
powered with an electric drill.

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I share the curiosity about how modern high power magnets would
perform
instead of the horseshoes. The best application I can think of at this
time is to boost charge a weak car battery, anywhere! I would have one
in my trunk dedicated to that function.
Click to expand...
Forget it. Your arm muscles would give out after a few minutes. 14
volts output at an amp is 14 watts, figuting 70 percen efficiency, 20
watts imput to the gen. You can't do that for long; a bicyclist can't
put out a sustained hundred watts using his legs, only for a short
burst. The thigh muscles are the largest and most powerful muscles in
your body.

At 1 amp, it'll take you an awful long time to charge a car battery.

> rg
 
On Tue, 16 Aug 2005 17:17:51 GMT, "Randy Gross" <aaawelder@yahoo.com>
wrote:

snip

Some related sites with pedal power outputs

http://www.los-gatos.ca.us/davidbu/pedgen.html
Burst output: 25 amps at 17 volts (425 Watts)
30 minute average output (back when I was in shape) 150 Watts

http://www.ibiblio.org/pub/academic/environment/alternative-energy/energy-resources/homepower-magazine/archives/23/hp23p48.txt
A modestly fit person can expect to
generate about one tenth horsepower (roughly 70 watts) for a brief
period. For normal regular use a generator capable of producing
50 watts or more is quite adequate. If you are a cyclist interested
in serious training, a generator capable of 100 watts or more is
desirable, PM generators ranging in size from 60 watts to 200 watts
are readily available and can be obtained with the bike generator
options described below.

http://www.otherpower.com/otherpower_experiments_bicycle.html
Although I have not tested this alternator for exact speed vs output
information, it seems to start charging 12 volts at approx 80 rpm.
When coupled to the bike, I was able to generate
5 amps(60 watts) in a leisurely way, and if I pedaled as fast as I
could, I'd get about 10 amps(120 watts). This
seems to be in line with claims we've seen for other peoples plans,
although it seems clear that with a higher gear
ratio, one could generate significantly more with this alternator.

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Watson A.Name - "Watt Sun, the Dark Remover" wrote:

"Randy Gross" <aaawelder@yahoo.com> wrote in message
news:xn0e62b099nyli000@news.east.earthlink.net...
default wrote:

snip

http://www.otherpower.com/pmg2.html Interesting low speed homemade
wooden alternator. He could probably more than double the output
if he mixed some powdered iron in his epoxy on the field coils.
Claims it can power a 120 volt tube type stereo that dissipates
300 watts, powered with an electric drill.

----== Posted via Newsfeeds.Com - Unlimited-Uncensored-Secure
Usenet News==---- http://www.newsfeeds.com The #1 Newsgroup
Service in the World! 120,000+ Newsgroups ----= East and
West-Coast Server Farms - Total Privacy via Encryption =----
default@defaulter.net

I share the curiosity about how modern high power magnets would
perform
instead of the horseshoes. The best application I can think of at
this time is to boost charge a weak car battery, anywhere! I would
have one in my trunk dedicated to that function.

Forget it. Your arm muscles would give out after a few minutes. 14
volts output at an amp is 14 watts, figuting 70 percen efficiency, 20
watts imput to the gen. You can't do that for long; a bicyclist can't
put out a sustained hundred watts using his legs, only for a short
burst. The thigh muscles are the largest and most powerful muscles in
your body.

At 1 amp, it'll take you an awful long time to charge a car battery.

rg
NOSPAM@dslextreme.com
Click to expand...

You're right! Raising eathworms would be a lot less tiring;-)

rg
 
Watson A.Name - "Watt Sun, the Dark Remover" wrote:

<snip>

I took a hard disk drive apart and removed the platters. I connected
a red LED the leads of the heads that go to the voice coil. When I
wiggled the voice coil back and forth in that strong magnetic field,
it lit the LED, easily. Also, some of the HDD motors are permanent
magnet and when spun will light the LED.
NOSPAM@dslextreme.com
Click to expand...

I ran across a site a while back, can't remember where, whose author
was selling used magnets he gleaned from hard drives and claimed they
were Neo's. I was skeptical because of storage media in a computer but,
it appears he may have been correct.

rg
 
On Thu, 18 Aug 2005 10:26:39 +0000, Randy Gross wrote:

Watson A.Name - "Watt Sun, the Dark Remover" wrote:

snip


I took a hard disk drive apart and removed the platters. I connected
a red LED the leads of the heads that go to the voice coil. When I
wiggled the voice coil back and forth in that strong magnetic field,
it lit the LED, easily. Also, some of the HDD motors are permanent
magnet and when spun will light the LED.
NOSPAM@dslextreme.com

I ran across a site a while back, can't remember where, whose author
was selling used magnets he gleaned from hard drives and claimed they
were Neo's. I was skeptical because of storage media in a computer but,
it appears he may have been correct.
Click to expand...
The part of the motor armature that's between the magnets and the
media is soft iron and "shorts out" the magnetic field. Kinda like
the E-core around a relay coil.

Cheers!
Rich
 
On Tue, 16 Aug 2005 21:14:37 -0400, default wrote:

Some related sites with pedal power outputs

http://www.los-gatos.ca.us/davidbu/pedgen.html
Burst output: 25 amps at 17 volts (425 Watts)
30 minute average output (back when I was in shape) 150 Watts

http://www.ibiblio.org/pub/academic/environment/alternative-energy/energy-resources/homepower-magazine/archives/23/hp23p48.txt
A modestly fit person can expect to
generate about one tenth horsepower (roughly 70 watts) for a brief
period.
Click to expand...
I'd like to take exception to this number here. You produce almost 70
watts just sitting there! (albeit, in the form of heat and not real
useful.)

When I was in HS physics, the class got around to the F+MA and all
that stuff, and did an experiment to determine just how much power
a person can generate. There was a 3-floor stairwell at this school,
and what the physics class did was get a few boys to volunteer to
run up the stairs as fast as they could, and be timed. Then, of
course, the boy's mass times the height, with some gravity factor
was the work done,divided by the time it took him to ascend 30 ft.
(10 M) of stairs gives power, the rate of doing work. These guys
were pushing a horsepower. But you were allowed to cheat - use
the handrail, vault instead of turn the corner, whatever. I tried
it and made about 300 watts, IIRC.

But that's "fight or flight sprint" mode - nobody could keep that
up for any extended period of time, obviously. So, maybe 70 watts
would be a good comfortable pace on, say, an exercise bicycle.

What somebody needs to invent is a movie of scenery going by, that
moves by (on the big-screen projection TV next to the exercycle)
at the same speed that you're pedaling. :)

I also have an invention for a new type of recumbent pedal - but
for a generator, you wouldn't need the gearshift. But I see I've
gone over, and that's a topic shift...

Thanks!
Rich
 
On Sat, 27 Aug 2005 18:09:38 GMT, Rich Grise <richgrise@example.net>
wrote:

I ran across a site a while back, can't remember where, whose author
was selling used magnets he gleaned from hard drives and claimed they
were Neo's. I was skeptical because of storage media in a computer but,
it appears he may have been correct.


The part of the motor armature that's between the magnets and the
media is soft iron and "shorts out" the magnetic field. Kinda like
the E-core around a relay coil.

Cheers!
Rich
Click to expand...
Your analogy is correct about the shorting- but it takes effort (work)
to move the iron armature (or pole pieces) through the magnetic force.
Regardless of the structure (magnet flux). It may be easier to move
through 360 degrees with a well designed armature/field but it would
take the same effort to produce the same power (electrical energy) if
it is produced in 90 degrees or 360 . . . (or with the bad design you
could use a flywheel, or some other mechanical means to smooth the
effort required)

I have a 120 vdc generator (from the 40's) and if I add any kind of
real field voltage (excitation) on it, it seems to lock up (as far as
one's hands trying to turn it are concerned)

No such thing as a free lunch. You want to generate electricity . .
it takes work.

Now, how much and how does it compare to the "grid' - a few years
back I did the arithmetic, buying an alternator, buying fuel, buying
the ancillary items (shed for the alternator, regular maintenance (air
and fuel filters), radiator flushes, depreciation, lubricating oil,
etc. etc).. I could just generate energy at the point where the power
company is selling it to me . . .

Now my opinion . . . the utility company probably tracks this stuff
more closely than I do . . it will always be just a little tiny bit
cheaper to buy power than make it (hydro, wind, solar cells,
geothermal, tides, notwithstanding).

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On Sat, 27 Aug 2005 18:29:16 GMT, "Rich Grise, but drunk"
<yahright@example.net> wrote:

On Tue, 16 Aug 2005 21:14:37 -0400, default wrote:

Some related sites with pedal power outputs

http://www.los-gatos.ca.us/davidbu/pedgen.html
Burst output: 25 amps at 17 volts (425 Watts)
30 minute average output (back when I was in shape) 150 Watts

http://www.ibiblio.org/pub/academic/environment/alternative-energy/energy-resources/homepower-magazine/archives/23/hp23p48.txt
A modestly fit person can expect to
generate about one tenth horsepower (roughly 70 watts) for a brief
period.

I'd like to take exception to this number here. You produce almost 70
watts just sitting there! (albeit, in the form of heat and not real
useful.)

When I was in HS physics, the class got around to the F+MA and all
that stuff, and did an experiment to determine just how much power
a person can generate. There was a 3-floor stairwell at this school,
and what the physics class did was get a few boys to volunteer to
run up the stairs as fast as they could, and be timed. Then, of
course, the boy's mass times the height, with some gravity factor
was the work done,divided by the time it took him to ascend 30 ft.
(10 M) of stairs gives power, the rate of doing work. These guys
were pushing a horsepower. But you were allowed to cheat - use
the handrail, vault instead of turn the corner, whatever. I tried
it and made about 300 watts, IIRC.

I'm not about to argue with you. A person "can" generate a horsepower
Click to expand...
of more for a (very) short period. (like how kenmore or craftsmen
appliances are rated in the US)

And when it comes to horsepower - The horse is walking in a circle -
pulling a load, not lifting his/its weight - so I'd have to figure
that in . . .

I can generate over 300 watts for a few minutes - I can only generate
100 watts for a few hours - and that's breathing hard - feeling like
death is imminent - all out, do or die exertion - with very few
people that can compete with me - except my neighbor. Hour long
race, and he's 1000 yards ahead of me.

True he's got that sweet carbon fiber bike, with the fancy alloy
spokes, and he's six years younger - but dammit I want to beat him!

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