Is a brushless motor max amp draw constant or does it increase as voltage increases?It's my understanding that a motor will draw more amps at higher voltage all other things being equal.So do I need more powerful batteries to run my motor at 22v then I do at 14v? Here is what was posted on a different site.
Quote:
When talking about energy and work, remember nothing is free, there is always give and take. Think of voltage as the "pressure" that pushes the current out of the battery pack. If that energy is forced out more quickly the battery will empty faster.
It's actually quite simple. Voltage(V) = Current(I) x Resistance(R), or I = V/R. For the purpose and accuracy of this discussion and with all other things being equal, the internal resistance of any given DC motor is fixed by its wire size and wire length.
For example, assume a DC motor has 0.5 ohms resistance and we use nominal pack voltages:
For a 6-cell pack, 7.2 volts; (I) = 7.2 volts/0.5 ohms or 14.4 amps
For a 7-cell pack, 8.4 volts; (I) = 8.4 volts/0.5 ohms or 16.8 amps
Because we run battery packs with fixed capacities, i.e. 4.6 amp-hr, potential runtimes can be calculated:
For a 6-cell pack; 4.6 amp-hr/14.4 amp = 0.32 hr or approx. 19 minutes
For a 7-cell pack; 4.6 amp-hr/16.8 amp = 0.27 hr or approx. 16 minutes
|
Is this correct or is there something I'm missing?
Threaded Mode
