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Forum Index : Windmills : 12v rewire v’s 48v rewire for charging

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martinjsto

Senior Member

Joined: 09/10/2007
Location: Australia
Posts: 149
Posted: 12:52pm 30 Jan 2008
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thanks guys i hope others going through similar problems reading this thread can find some usefull information as i have.
yes im happy with the results so far, a lot better than the results from unit i started this thread with, that is on the block in the mill right now, i will change it and do some tests on that motor next time i get to visit.
sory glen, maby i should of described my setup better, the results and pics i have posted here ARE rectified results in DC not AC, i have rectified using 4* 35 amp bridge rectifiers and have not tested the a/c side of mill apart from the initial ohm test for continuity,
the results are for O/C unloaded volts, volts loaded and amps when loaded to half O/C. i got a internal resistance of 2.89ohms.

are they dc electrolite caps davef? and would i put them across the positive and negative outputs and then do the volt/amp readings?

i read about rms and multimeters today and can see that the incorect meter will give very diferent results from the correct one.
im not too stressed about the exact maximum output as long as i get some charge for a reasonably expected time for wind conditions ill be happy and after following you guys test proceedures above i am confident i have a 7p3p and a 7p2p that will do just that. i can now concentrate on other factors, stability of the guys and the pole for a start as i notice a bit of harmonic swaying of the mill when windy.
i also ordered 50 25*12*6mm neomymium magnets the other day, should get them soon and will be looking at the magnet modification as another project. does any one know what is the best angle if any to set these in for a cogless rotor?

still have to get a start on a V.A.W.T i have started getting some pieces together for. lots to do and so little time.

i just fried my battery controler, overloaded it whilst testing the motor in lathe today, it had a 200w dump load connected but it fried the bord and globes, ah well i see what you mean in your signature gill lolol
these units are pumping out quite a bit of power I must be carefull!!!

martin
free power for all
McAlinden WA
 
davef
Guru

Joined: 14/05/2006
Location: New Zealand
Posts: 499
Posted: 06:16pm 30 Jan 2008
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[Quote]are they dc electrolite caps davef?Electrolytic caps.

As Gill pointed out there will still be some "3 phase ripple" after the rectifier. This MAY have a small effect when trying to take measurements using a multimeter set on the DC ranges.

Yup, positive to positive and negative to negative. Do NOT hook them up backwards or they could blow up. Good idea to wear protection glasses when working around supplies at this sort of power level.

Seeing as you are not after absolute measurements I would forget about the capacitor!
 
GWatPE

Senior Member

Joined: 01/09/2006
Location: Australia
Posts: 2127
Posted: 11:19pm 30 Jan 2008
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Isn't this a 7phase conversion? Where does the 3phase ripple come from?

Martin, the Tektronics CRO pricing will test your budget.

Gordon.

become more energy aware
 
davef
Guru

Joined: 14/05/2006
Location: New Zealand
Posts: 499
Posted: 07:38am 31 Jan 2008
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Don't where I got the 3 phase from

7 phase . . . even less important to have to filter it then.

If you just want to look at waveforms and not do any fancy calculations that just about any old analogue 'scope would be useful. Like looking for missing or uneven phases, 100s of things you can do with them.

 
martinjsto

Senior Member

Joined: 09/10/2007
Location: Australia
Posts: 149
Posted: 09:40am 31 Jan 2008
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the main thing i guess is ensuring that i am getting a decent charge, a scope would be good but im not realy up to scratch on the use of them, im a toolmaker by trade and my electrical qualifications are only restricted electrician for fault finding apliances when i use to service them. generaly a multimeter did the job.
i will look at a hz reading multimeter, ability to check rpm would be good.
thanks guys i now know how to correctly test my units,
i intend to make about 10 generators for my farm, a few waterpowered wheels for winter(and the fun of it)
and about 8 hawts or vawts. between those and solar pannels they will power my farm completely as im off grid.
also am wanting a waterwheel mill to circulate water around the farm and into the main tank.
we hope to move down there at the end of the year, things going well.
back to repairing the batery controler

martin

free power for all
McAlinden WA
 
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