thank you for the replies, but what do you guys think about running each of the 6 motors through a MOSFET?
Hmmm, those motors look a bit underpowered - a continuous power of 37W isn't much, so in adverse conditions they could run very hot.Of those controllers the last two are wash-outs I think, 0.1 ohms internal resistance is too high. The first has the current ability but doesn't have any protection circuitry - you want at least to have an over-current cut-out to prevent burn-out of motor or controllerin stall conditions - but you do get a current signal output to monitor, allowing current control in software.The first one claims 30A, but it won't take that, the MOSFETs are 0.005 ohm, so something like 15 to 20A will be the practicalmax continuous load I think before it starts to get too hot. fan-assisted cooling would help there perhaps. 20A per motor thoughought to be enough ??It is nice and cheap to experiment with, and with only 12V there are various failure modes you won't have to worry aboutso much (high current and high voltage together make robust H-bridges trickier to design. I suggest getting one of this 30A one and seeing if it performs as advertised, firstly with a dummy load like some car bulbs, then one of the prospective motors/actuators.It should be enough for at least one of your motors/actuators