Two DC motors (Brushed PM Micro) are attached to a voltage source by using a single wire (1mtr). Motors are then connected in parallel (two seperate but same spec. wires, each 1ft in length).For simplicity lets name the motor as A & B and assume that wire resistance is same across A & B. Given following parameters :
- DC resistance of motors at rest: A=2.32ohm ; B=4.04 ohm
- I @12V A=2.5A & B=0.72A.
- Mass of the object in case of A is greater.
CEMF @12V A=6.2V & B=9.09V (as per Vs-IaR)
The above motors will be run by two different sources: (i) Solar Panel (22V) (ii) 12V Battery
At low battery, suppose we run the A motor and then the B motor. They'll draw a lower amount of current because of the reduced voltage. But what if they both were running together. Will they show the same current characteristic, i.e., there current reduces by the same amount as it was when they were running individually? In other words, is it not a possibility that the motor under heavy load sucks a lot more current than the motor under light load leading the latter to starve.
Also given the fact the CEMF of 'A' motor (heavy load) being less than that of 'B' motor, it opposes less to the current and thereby allows more current to flow. Also, what will be the behaviour under low solar radiation?
I need your views on this matter.