Hi, I really want to understand the motor behavior. After reading many posts, I decided to experiment with it.
I use a run of the mill motor taken out of an old RC car, I have no idea what the spec is, the only thing I know is that it has a 40ohm resistance.
On my bench power supply I set the voltage to 6V and I gave the current 3A.
Now when I power up the motor, initially the ammeter indicates that it draws 0.5A, after 5 minutes or so, the ammeter starts to drop and it fluctuates quite a bit. Then after 20 minutes or so the current continues to drop then it goes down to 0.17A and becomes very steady.
The motor is under zero load condition all this time.
My question is is about the current drop. Is it because because the back EFI causes the fluctuated current until it gets stabilized?