When I'll need to reuse the toroid for 80V I'll take out some wire from the secondary.

Quote Originally Posted by irving2008 View Post
Why Nema34 and not 23s?
Not sure. I think it will give me more torque at high speeds (1.6mH nema34 vs. 3.5mH nema23). Plus the robust 14mm shaft.

Quote Originally Posted by irving2008 View Post
33v secondary will give 43 to 48v on supply variation which doesn't leave much room for regenerative dumping on a 50v drive. I'd go for 30v secondary.
Actually I want to push the drive chip to the limits as the chip protections are quite good. But I'll probably go with 30V.

Not sure about the voltage drop on load. Will it be significant?