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I need some amps
By MelTx, Section Homebrewed Electricity Posted on Sun Feb 13, 2005 at 04:18:43 PM MST
where do amps come from

Hello All I have 4 motor convert gennys on line trying to charge 3 115 ah batts a total o.f 315 AH battery bank.Each gen is rectified, with its own blocking diode on the postive wire and tied to a juction strip.Then the D.C. is fed to about 1k mfd caps, with another blocking diode between them and the batts.The open volts between the caps and the batts is 30 up to 75 VDC depending on the wind.Well as usual the batts drag the volts down to about 13.If I hook a multi-meter in between the caps and the last diode,with the meter set on 10A the amps read .100 or some times .400
The batts do charge but not much.Does all this seem right,it seems that there should be more charging going on.I thought about the I-E-R thing but how do you get the R factot without letting the smoke loose.Can some one explain what hapens to the 75 volts in realation to the amp output. Thank you for your help

I need some amps | 7 comments (7 topical)

Re: I need some amps (3.00 / 0) (#1)
by finnsawyer on Sun Feb 13, 2005 at 09:30:26 AM MST

I think the first step is to evaluate the output of each genny individually. Connect each one in turn by itself to a battery or two batteries in series to see what you get. You could replace the batteries by resistors, but start with large values (say 1,000 ohms) and work your way down. Make sure the resistors can handle the power. I. E. the IxIxR.
GeoM

Re: I need some amps (3.00 / 0) (#2)
by Jerry on Sun Feb 13, 2005 at 11:00:28 AM MST

Hi MelTx

Could you discribe each motor conversion? Things like HP, rpm, volts, amps, phase ect?
Also dicribe the magnet type, gap between magnets and lamination. Did you keep stock wiring, reasign stock wiring or rewind?

What type, size and count blade? At what wind speed do you see the #s your getting?

1 of the motors I convert is a 1 HP. The name plate says 120 volts at 10 amps.
It's a 4 pole motor. It has 4 main run windings. These winding are wired sires. This means each coil is a 30 volt 10 amp coil.

When I wire the 4 coils in perelell the motor becomes a 30 volt 40 amp motor.

When using this motor as a wind generater 30 volt is much closer to 12 volts and 40 amps is much better then 10 amps.

Using OHMs Law either way the wattage is the same. ExI=P or watts. So 10 amps X 120 volts = 1200 watts and 30 volts X 40 amps = 1200 watts. Same power but the last arangement is much better suited for 12 volt wind power.

I suspect you've left the motor wiring stock. Once we know the motor specs then a coil asignment can be recamended to improve output.

What your doing is like trying to take off in high gear.

JK TAS Jerry

Airheads Page

[ Parent ]

Re: I need some amps (3.00 / 0) (#3)
by MelTx on Sun Feb 13, 2005 at 05:26:01 PM MST

Hi Jerry yes the motors are stock,no windings have been changed.There are 2 start and 2 run leads coming out also 2 common leads.There are 8 poles & I am using 6 double stacked neos 1 x 1/2 x 1/4 " 12 magnets in each motor. There are no tags on the motors but they are ceiling fan motors probably 1/3 or 1/2 H power.I am using 4 bridge rectifiers on each motor.Spining by hand you get 12-14 open volts.Using a drill you get 30-60 open volts.With a 15 mph wind they will charge the batts at 13 vdc.But there are no amps.I guess the stock wire is just too small.

[ Parent ]

Re: I need some amps (3.00 / 0) (#5)
by ghurd on Mon Feb 14, 2005 at 07:12:47 AM MST

Jerry,
The 2 common leads. If the coils on these are in or out phase, can't that have a bad result? I dug in and seperated mine.

MelTx,
Thats a lot of magnets. Is there a return path for the flux? How did you do it?

G-
Ghurd.info
[ Parent ]

Re: I need some amps (3.00 / 0) (#6)
by jk on Mon Feb 14, 2005 at 10:35:06 PM MST

If there are 2 common leads. The question would be. Are the 2 comon leads in comon with each other or are they seperate? If there seperate are the a comon lead for the start winding and a seperate for the runs for the purpus of 2 speeds?

In any case the starts are out of phase with the runs. They also tipicaly have diferant size wire and coil turn #s.

When I first read the post I was thinking this was a normal motor. Celling fan motor are anything but normal?

All the celling fan motor I've taken apart have many poles of very small wire. Ifact they have an outer set of coils and an inner set. These motor are designed to opperate at very low rpm. Plus a very small amount of hp is nessesary. Therefor a very low amount of amperage.

With out changing the small wire or reasigning exsisting coils I seem them as a very good high voltage very low amperage choice. If you perelelled all there littel coils the voltage would drop and the amperage would go up.

They are aranged strangely for shure.

JK

[ Parent ]

Re: I need some amps (3.00 / 0) (#7)
by ghurd on Tue Feb 15, 2005 at 07:34:23 AM MST

Mine are (were) 1 wire to one set of coils, 1 to the other, 1 to BOTH.

Any ceiling fans I had appart had no space to put decent magnets. If magnets were packed in there, there would have been no return path for the flux to speak of.

Then there is the issue of 7 outer coils in the cieling fans I have here. How many magnets? 6 (NSNSNS skip a coil?)? 14 NSNS? I gave up, to many problems.
G-
Ghurd.info
[ Parent ]

Re: I need some amps (3.00 / 0) (#4)
by Nando on Sun Feb 13, 2005 at 08:45:33 PM MST

Fan motors ( ceiling type) are most of them around 1/4 to 1/3 HP.

Then windings are low gauge and low current and you should use a transformer to bring the voltage to the battery level you need, you can use two transformers to each winding and full way rectification to each winding.

Regards

Nando

I need some amps | 7 comments (7 topical)

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