Thread: Motor braking.
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Aragon
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05.08.2007, 12:24 PM

Quote:
Originally Posted by Serum
charging the cells above 4.2V per cell? what did you discovered? a 120 percent efficient setup?
I didn't mean it would charge the cells to above 4.2V/cell, I meant it might charge them at/with more than 4.2V/cell.

Quote:
Originally Posted by Serum
The peaks MIGHT be higher [than 4.2V/cell] (not saying they are) but the lipo won't bother too much from little spikes.
Well that goes against every precaution I've read about Lipo chemistry. The whole basis of Lipo charging is to:

a. Not exceed the maximum factory rated charge current.
b. Not exceed 4.25V/cell.

Where have you seen that they can survive more than 4.2V/cell?

Quote:
Originally Posted by Serum
@aragon; 'it's easier to lock the wheels than to spin them' what do you want to do with the heat that is produced by that? stuff it in your esc? no sir, you store it in your batteries again;
Yes, that would be ideal, without a doubt. I'm just not convinced our RC controllers are advanced enough to be doing that...

Quote:
Originally Posted by Serum
Why?
If a lipo (or any rechargable cell) is connected to voltage source of X volts that is higher than the lipo's voltage, the lipo will draw a current. If the lipo is flat, it will draw a higher current for the same source voltage X.

If the (flat) lipo is drawing more current for the same voltage produce by the spinning motor (ie. same wheel speed), the current flowing through the circuit will be higher, and the braking force will be higher.

Quote:
Originally Posted by Serum
It's plain simple, it works like that period.
I'll wait for a better explaination and/or real world test results before believing that...

Quote:
Originally Posted by Serum
If a battery can be discharged at 20C for peaks, why can't it be charged at peaks of 20C?
Would love to know myself. :)

Last edited by Aragon; 05.08.2007 at 12:26 PM.
   
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