Current

[precisiontek]

Hello all..

I am able creating 140 VDC on my linear alternator..

This is off one stator with 8 coils..

My amperage is only 7 amps..

I have seperated the coils into individual circuits and tested the amperage...as Individual circuits I get about 3 amps per coil...when i series them together my voltage rises accordiling but my current does not..

I have tried reversing each coil..

I have 50 wraps of #14 wire per coil..

I know this isn't much info,but does any one have any ideas???

Gary

[nothing to lose]

Don't feel bad I just came in from completing my newest motor conversion, at about 1000rpm I get 13Vdc no load and about 8Vdc running a puny little dc fan. Bummer

You know of course if you wire for higher volts your amps should say the same, not increase, and if you wire for higher amps then or voltage stays the same and does not increase.

So depending how you wire you can have 140VDC at 3amps by adding enough 3amp coils to make 140V, amps won't change. If you add 2 stators of coils then you can have 140V each added still equals 140V but your can double amps, 3amps each equals 6 amps.

Kinda sounds like you have it about right to me maybe the way I read it.

How many volts are each coil? About 35V? 4 coils = 140V, 2 sets of 4 =  3amps each making 7amps?

Otherwise I am not sure how you went from 3amps up to 7amps? If all 8 coils are series they should be 17.5V each to make 140V, but I think you would still only have 3 amps not 7amps.

Course if this is linear then I am not taking into account if the end coils do less volts or amps either one or even both.

"I have 50 wraps of #14 wire per coil.."

You say your getting 3amps from that, but how many volts per coils is it?

[kitno455]

3. things are missing gary:
   
1. what do you want (volts and amps)?
   
2. how are you measuring this?
   
3. what does the waveform look like?
   
   

allan

[precisiontek]

I am not sure where the 7 Amps come from either...

Lets say that I am getting 17.5V and

3 amps per coil..I have 8 coils..If I run each coil to its own rectifier then series then parallel the rectifers my amperage should go to 24amps?...

Allan...if you read this give me a call if you have time...

Thanks

Gary   888-251-8433

[drdongle]

When you connect coils in series you will increase the voltage but current will stay the same, when you place coils in parallel the current will increase, but the voltage will not. Assuming that all coils are the came, and in phase.

[finnsawyer]

Is the 7 amps the current when the outputs are shorted (short circuit current)? Divide the no load voltage (open circuit voltage) by that value and you get the resistance of the alternator (equivalent source resistance).  Technically that's only true for dc circuits, but may be fine at low rpms (frequencies).

To answer your question, it may be less because each coil now has to overcome the full rectifier voltage rather than 1/8th of it.  Each coil has it's own equivalent source voltage.  Any thing you put in series with it reduces the usable voltage across the load.