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About cleggsan
Expertise
All technical areas of Electronics Engineering.

Experience
BSEE, MBA, Design, R&D, University Research.
Senior Life Member of IEEE. Life Fellow of AES.

Organizations
IEEE, Consumer Electronics Society, Audio Engineering Society.
Broad teaching experience; work experience mostly in consumer electronics and conversion from analog to digital technologies. Pioneer in digital audio at all levels.
 
   

You are here:  Experts > Computing/Technology > Job Searching: Technical > Electrical Engineering > Stymied on how to calculate this

Electrical Engineering - Stymied on how to calculate this


Expert: cleggsan - 12/13/2006

Question

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The text above is a follow-up to ...

-----Question-----
Hi, I wanted to know if you take an acyclic generator homopolar generator (faraday disk high current low voltage generator) and put it in series with a high voltage source, will the current of both the high voltage source and the acyclic generator add together with a resulting average voltage from the two? In this way you could maybe eliminate the high current brush contacts of the acyclic generator. Is this feasible or am I barking up the wrong tree? I'm just not sure how this can be calculated. Thanks
-----Answer-----
Nice discussion on the Faraday disc generator at:

http://en.wikipedia.org/wiki/Homopolar_generator

ANSWER:  If generators or connected in series the voltage adds and the current remains the same through the chain.

If the generators are put in parallel the currents will add, theoretically, but the different voltages will not support a direct connection and the differential of the two voltages will cause a fault of some kind; overheating or burning out of the windings, etc.  Even high voltage flash over.

BUT:  It may not be a practical solution because of common grounding or common wiring, etc.  I am not sure how you would connect them in series.  In parallel I think you would be asking for big sparks flying.

Cleggsan

O.K. fine... but will the higher current of the acyclic generator be dominant or the low current of the high voltage power supply? Also, in the circuit you would connect them in series by supplying the high voltage to a capacitor through diodes and then in series with the acyclic generator. It's a pretty simple circuit. Not asking for big sparks just electrolytic decomposition of water at a high current rate with low brush loss. I just wasn't sure if the higher currents dominate the lower currents no matter what the voltage. Your thoughts?  

Answer
Let me repeat:  If the generators are connected in a series circuit the current must be the same in each generator.  If the internal impedance of either generator is high it will cause a current limiting effect caused by the IR drop across the internal impedance.  Brush contacts are usually high impedance.

If you can give ma a diagram or picture of how you intend to connect them or ocnfigure them I can give you a better opinion, but based on a simple connection of the two generator systems it seems an improbable solution.

Cleggsan@ieee.org  

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