>tcmtech
Ahh, I am somewhat in the same boat as you. My machine (**broken link removed**) normally comes with these chinese copy 3/4hp AC motors. Mine burnt out from doing constant reversal operations for threading. So I figured I would do an upgrade and switch to DC. I have **broken link removed**, and **broken link removed** already.
The controller seems capable of taking up to 190VDC as input, but the motor's max field voltage is 90vdc.
>BrownOut
Yeah, after trying to find a suitable transformer through the usual suppliers (digikey, etc) I found the all wanted 75$ or more for a lump of iron and copper.
The only other option is doing the autotransformer configuration mentioned by tcmtech, which would allow me to use a smaller transformer before the rectifier, but I am having a hard time finding a diagram and formulas for sizes of transformers in that configuration.