Quote Originally Posted by A_Camera View Post
I still don't understand what the benefit would be in using 8A drivers with 3A motors. In my opinion that's overkill. Also, if I would spend that much on the driver I would NOT buy a cheap BOB. I understand that the AM882 has stall protection, but come on... is it really a huge issue? After all, stall is a cause of wrong use or configuration. Also, why not the DM542T? It is more of a realistic match for the 3A motors than the AM882 and is much cheaper. Yes, the AM882 is 80V while the DM542T is only 50V, but again, if a machine is well built you will hit the speed limit anyway, even with the 50V drivers.
Current and voltage has little to do with the reason.
DM/Q drives are older technology.
AM/EM drives are the latest technology, with the benefits of auto-tuning and anti-resonance. Both of which mean the drives have much better performance for any given power supply or motor. Stall detection is just an additional feature, which on dual motor axes, can greatly limit racking damage should a stall occur, and can also stop things on single motor axes, should something go wrong. You've got to remember, it's not just over tuning that can cause stalling, crashes can as well.