RPM OHMs/coil turns/coil V peak to peak (no load)
17 AWG 833 0.1 60 3
21 AWG 833 0.4 150 8
note : this is for just one coil page 4 has my current 18 coil 24 magnet generator
:lol: more to come in the next few days .. but i gotta get outside and enjoy this beautiful day..Nigel Goodwin said:I seem to remember (fairly vaguely) that a 100W bulb is just about sustainable from a bicycle driven generator? - but probably NOT for someone as unfit as me these days :lol:
I believe nigel was talking about the maximum sustainable human output power from a stationary cycle ...yes ?...stevez said:Sounds good. Share what you've done when you have time.
You've not mentioned the voltage but keep Nigel's comment in mind. If the total power ouptput at 2 amps is significantly more than a fraction of a horsepower something might be wrong with your measurements. Now, 2 amps at 12 volts makes sense so I am not saying that 2 amps is wrong.
Anyway, I'd be interested in seeing the arrangement if that's possible.
williB said:I believe nigel was talking about the maximum sustainable human output power from a stationary cycle ...yes ?...
the 2 A was not at 12V though as i was seeing what i could put into a resistance of .33 ohms ..
at 2 A i got a voltage of 1.36 V into a measured 0.4 ohms.
V^2/R gives 4.62Watts
but V*I gives only 2.72 Watts
i dont own an AC Ammeter, but i would be interrested to see what is comming out before the diodes.
total measured resistance minus the meters tip to tip resistanceHow did you measure the 0.4 ohms
thats probably why..I wonder how accurate you existing meter is?, as you're not feeding it smooth DC, but essentially double frequency AC that only moves one way from zero - a normal meter isn't going to read that correctly.
williB said:I'm still working on my portable generater..btw..
below is the layout for six x 1.5" coils with 12 x 1/2" dia. magnets..
wired in single phase should output around 24V AC p-p depending upon the speed of rotation and the gage of wire used..
imo 22 to 20 gage would be best , if you go absurdly thin , you get more voltage , BUT the wire resistance will be way too high to do anything useful..
bryan1 said:Hiya Klaus,
Eh mate that design ya doing sound interesting, do you mind putting up a few pic's of the alternator as it will be good veiwing. When you say your only going to have a 1 metre diameter prop that sounds way too small for a wind genny. I have a spreadsheet that tells you the T.S.R. (tip speed ratio) for a given blade diameter and expected wind speed, the ideal tsr is around 5 to 7 off memory, if you like I can send the spreadsheet to you so you can try out a few different combinations. Also have you ever checked out the otherpower forum as some of the blokes on there are wind genny guru's and don't mind answering questions thrown up on there. As far as not bothering about 3 phase star or delta configaration have a good read up on that forum and I reckon you'll soon change your mind. Off what you describe with your project, setup correctly I'd be surprised if you didn't get 750 watts atleast. Also I found a contact in Oz for 30x40x10 neo magnets and Hugh Piggot's book for around $200 and thats with 24 magnets. Anyway if I can helpout in any way Klaus I'd be happy to.
Cheers Bryan
Exactly .. The coil should take the shape of the magnet , within reason..Eh mate in all the wind genny coils I've seen they all have been sorta pear shaped but there's nothing to say a round coil wouldn't work as good. I suppose since your using round magnets it should be ok.
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