Hi,
I am looking for a neat and cheap way of protecting motors and electronics from high stall current. I have some very basic electronic knowledge, but it and I are fuzzy and dated!
The set up in brief is 3s lipo (around 12v) into ESC (electronic speed controller) into brushless outrunner motor. I am very familiar with RC cars / robots etc, so this side of things isn't a problem.
What I want to achieve is a way of limiting current to around 5 amps so that if the motor is stalled for any length of time, it won't overheat. There is likely to be some thermal protection in the ESC. But it would probably 'recover' too slowly. I need a fairly fast reset. Some soft-starting effect would be acceptable.
I have looked at PTC thermistors as a possibility, but slow recovery time and max current is I think a problem.
I have heard of inrush and current limiting diodes, but know nothing about them.
I have seen a simple circuit employing an LM317 and one or more 2n3055s with an adjustable threshold here http://www.circuitsgallery.com/2013/07/high-current-adjustable-power-supply.html
...but I am not clear on whether it does the job! Building the circuit wouldn't be a problem.
I am open to any suggestions / ideas / solutions. Please go easily on me, Volts x Amps = Watts is about my limit at the moment. Many thanks.
P.
I am looking for a neat and cheap way of protecting motors and electronics from high stall current. I have some very basic electronic knowledge, but it and I are fuzzy and dated!
The set up in brief is 3s lipo (around 12v) into ESC (electronic speed controller) into brushless outrunner motor. I am very familiar with RC cars / robots etc, so this side of things isn't a problem.
What I want to achieve is a way of limiting current to around 5 amps so that if the motor is stalled for any length of time, it won't overheat. There is likely to be some thermal protection in the ESC. But it would probably 'recover' too slowly. I need a fairly fast reset. Some soft-starting effect would be acceptable.
I have looked at PTC thermistors as a possibility, but slow recovery time and max current is I think a problem.
I have heard of inrush and current limiting diodes, but know nothing about them.
I have seen a simple circuit employing an LM317 and one or more 2n3055s with an adjustable threshold here http://www.circuitsgallery.com/2013/07/high-current-adjustable-power-supply.html
...but I am not clear on whether it does the job! Building the circuit wouldn't be a problem.
I am open to any suggestions / ideas / solutions. Please go easily on me, Volts x Amps = Watts is about my limit at the moment. Many thanks.
P.