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BONO

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Reply with quote  #1 
As Lifepo4 cells are only 3.3v each, could cell voltages be added in and out to provide a simple speed controller?
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ampman

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Reply with quote  #2 
Actually I have done some experimenting with this. I will upload a diagram of an idea I had for my novel switching device that adds one cell in series at a time!
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ampman

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Reply with quote  #3 
Ok so a conducting curved rail (broken with high resistance) connects the cells in series
The battery negative comes from where ever the jumper is at

The jumper takes the battery negative and has two contacts, so there is no break over a non conducting point. And a small resistor gives you half a cell add at the cross over! celladder.jpg

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ampman

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Reply with quote  #4 
Variable speed, no controller.
Charge the cells after use individually, and maybe have bigger cells at the bottom of the range as they will have more usage on average!
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BONO

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Reply with quote  #5 
Good in theory but you will need seriously high gauge contact points, that is why people changed to using MOSFETS.
I had a very old milk float once and the rheostat was huge, I don't know if anyone still manufactures them?
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