110 ac alt

[hiker]

its a modified car alt--field coil for output..

took the lams out and replaced with two layers of strapping tape-glued 12 mags to that.

i removed the internal reg but kept the bruches[for power out]..

turning by hand with stock pully i get 30 plus volts--real slight cogging.

with wires shorted coggs bad.

next i hooked it up to one of my pedgens--wired a 110ac cfl to the outputs.

it powered right up at a slow pedal rate-with a smaller pully it would be even easeyer.

not sure how much power it puts out -should be able to power up 3 or 4 cfls ?

turned out to be a easy conversion..late here-ile test it some more tommorrow.

hers some picts and one 3.8mb clip

         http://www.otherpower.com/images/scimages/1236/car_alt_clip.MOV

[wooferhound]

Too Cool . . . But i can't understand clearly how you changed it ?

[rippersoftware]

OK.  So you removed the stator coils in the case and replaced with spacers, banding, etc. to glue magnets to and kept the rotor coils (field coils) and obviously the brushes for output?  Fixed magnets and a rotating coil mass from a car alternator.  Very neat idea.

What size magnets fit into the area?  How many did you use?

RipperSoftware

[electrondady1]

real slick hiker!

id like to duplicate it as i have a few old alts. and mags laying around.

i see you used what looks like 12 big ceramic mags.(dimensions please)

i just checked the shelves but i cant find the center section of the  alternator i had dismantled.

i've still got the stator and there are 21 coils on it

if i recall correctly there were 14 fingers. seven to a side

so how does that compare with the number of "fingers " on YOUR center section.

i know this is single phase but i can't figure out how a 7 to 12 or 14 to 12 ratio

would work?.

and what sort of rpm is the alt turning  for your demo.

[hiker]

hey woof......

i tossed out the stator--and replaced that with a strip of 1.4" strapping tape..

its about the same size as the lams were..

it fits right in the grove where the lams were--super glued in place[on one side]

next i glued on some of lowes mags to that[12]-rotor has 12 fingers..

i sodered on a wire to each field output brush[power out]

tossed out the built in reg and diodes[you could keep those if you want dc out].

i also added another lenght of strapping tape to the backside of the mags[not as wide]

then just bolt it back togeather..

havent had a chance to do more tests--its no power house --just a experment-fun stuff..

[hiker]

the rotor has 12 fingers--so you use 12 mags..

no idea on the rpm--not that fast..

it was just a experment--no powerhouse..

[hiker]

i hacksaw off the inner ring on the rotor..[under the fingers]

output went up some what--now i can slow the pedgen down to a crawl and still have light..its probably only good for 40 watts?-powers up 2 cfls-havent tried beyound that.--tried a 100w 110ac light bulb- only about half bright  :{  

oh well--was a fun project............

[Flux]

Interesting experiment. The advantage of not knowing that it couldn't work was that it didn't put you off trying.

The eddy currents don't seem to be as bad as it ought to have been but with proper measurements I suspect it wouldn't have been too good.

The other problem with that type of design is the fact that you are stuck with single phase and the leakage reactance is going to be very high. That is why the output falls rapidly with load.

The iron loss problem can be solved with proper laminating but it is a difficult mechanical construction. The leakage reactance problem is more difficult and commercial designs using that idea have had to resort to force commutated rectifiers.

In its simplest form it is the Sturmey Archer dynohub alternator that was used for many years on bicycles, where its reactance limiting was used to good effect to prevent blowing bulbs when you went faster.

Not very practical but an interesting experiment all the same .

Flux

[hiker]

i took a few hundred winds off of the field coil--that droped it down into a more

usable voltage--lite up a 50watt headlight.. still not all that great..

so i striped the coil completly and will rewind with some 14gauge or what ever fits.

was even thinkin of doing a wave winding around the rotor gaps--hmm

guess ile make a new post when i get around to doing that.......

really strange thing ==the voltage hits a certain spot and just hangs there even when you incress the rpms--on the plus side it stays there even as the rpms go down to a crawl?