I have 900oz-in (3.3mH inductance) nema 34's on my mill being driven by KL8060 drivers and a 48V regulated power supply. I can reliably rapid at 200ipm without any lost steps or issues but I've always wondered if I can get a little more speed out of the machine. I'd like to build a new toroidal power supply for the motors, but am having difficulty finding concrete answers for acceptable voltage.

Many "established" sources state the maximum voltage you should supply steppers with is Vmax = 32 * sqrt(L) - in my case this is roughly 58V.

Many cnc builders state you should always supply steppers with the highest voltage available that your stepper drivers can handle.

So which one is it? I've read that supplying steppers with increased voltage can cause overheating issues but can't wrap my head around why this happens if my drives are limiting the current flow. I'm curious what/if any consequences will occur when I supply my motors with 80V?