thanks guys for the replies,
here's what Im trying to do overall.
I have a Lithium Polymer battery thats at 7.4V, 10C discharge capacity and say 1000mah. That makes it ~10A discharge / burst current.
The DC motor (MOTOR 1) is motor is 6V rated, Im running it at 7.5 V (from Lipo battery), Continuous current of motor (under No load) =~0.5A at 6V, Stall current ~ >6A after testing it at a power supply, starting current I have no clue .
I want to run a RC car with this set up. However, at stall the motor draws >6A, which i want to avoid to increase endurance of the system. So i wanted to regulate the motor current to ~ = 2A or 3A during stall of the motor. AND, if there's a short circuit i don't want SMOKE !
Also I observed the following with my circuit (image in url)...
https://obrazki.elektroda.pl/6223290100_1444890216.jpg
Instead of a battery im running it of a power supply. With the regulator's voltage divider input to the gate , and a lower rated motor (MOTOR 2: 6V, stall current ~0.5A) present , I am able to limit the current from ~0.005 to 0.5A by adjusting the pot , thus altering the torque.
However, if i try the same with MOTOR 1, the current through the motor begins to increase (trickling) and reaches ~6A and the power supply trips.
what is the reason ?
I am checking the "foldback current circuits" too.
How else can I limit the current ? .
rgds
Help greatly appreciated
rgds
mike