I have two brushed DC motors that pull a max of 40A at full speed. I need to be able to control speed and rotation simultaneously on both motors (typical H bridge/PWM stuff).
I find many motor controllers out there but after reading everyone's posts and test results, it seems that most are greatly overrated and get extremely hot at much lower than rated currents. UN178, etc.
Cost is a big consideration on this project.
Looking for any suggestions!
Thanks
Pick a motor driver that can easily handle the start/stall current of the motors. It will be much higher than "full speed" current.
Any recommendations ? I do not have info on start/stall currents (these are marine trolling motors) and not sure it is available from mfg.
Thank you for the quick reply!
You can estimate the start/stall current by measuring the winding resistance using a multimeter. Turn the motor shaft very slowly by hand and take the lowest reading.
Start/stall current in Amperes = (motor power supply voltage)/(winding resistance in Ohms)
The generator effect of turning the shaft doesn't allow the mm to settle. At rest, the lowest resistance is about .2 - .3 but not sure how accurate this would be.
So assuming a start/stall of double the full draw, what controller might one consider in the 80A per channel range - suggestions/options?
TY!
Motor voltage?
12v system
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