I cannot figure out this by myself, on a first quick look over internet.
I have two motors RS550s like this (http://banebots.com/p/M2-RS550-120) and I want to buy a proper controller for them. I had a look on these two: https://www.robotshop.com/eu/productinfo.aspx?pc=RB-Dim-30&lang=en-US or https://www.robotshop.com/eu/productinfo.aspx?pc=RB-Dim-42&lang=en-US but, I don't know which one is more suitable for my project.
The first thing I looked at was the stall current of the motors.
At 85A, neither one of the options you linked to would survive. I personally don’t have any good suggestions outside of https://www.robotshop.com/letsmakerobots/node/2484 . There is one listed to maybe handle up to 80+A.
Well your motor consumes 1,2A at no load, but can go up to 10A with a little bit of load and to 82A if stalled :~(. Neither of these drivers can handle 82A but at least they have over-current protection. I would suggest that you make a stall-detection system (probably with shaft encoders) to ensure your current stays around max. 10A. Then you can save yorself some 500$ and buy a medium-power motor controller.
Wow. Thank you for the quick replies and for making me aware of the stalled consumtion.
Maybe you can recognize the motor ...so Markamas idea seems ok since I already have the gearbox that prevents stall. Later, if it will be necesary I will try something different. For now I will go with the sabertooth 2x12, which seems a reasonable choice and I will make all the adjustments while building everything ...
I agree with you to use sabertooth controller. Personally, I am not an expert and I have 2x50, 2x25,2x12, all of them work very well for a rookie like me. In case you dont burn anything when motor go over certain amps, I’d suggest you to use proper fuse to protect those controller.
I measured the consumption and even when I block the motor for 3-5 seconds, the load is less than 10 amps (it was around 8 amps). This is mainly because the gearbox is not blocking the motor.