Here's a money-grubbing question from a hard-case tinkerer:
Leadin: In order to run a 3-phase motor drive from single phase input, the user must derate the unit by 50%. This is because the input rectifier and filter capacitors are too small to handle the increased peak current of a single phase feed.
There's a "simple" way around this: feed the input with DC (or feed the internal DC bus).
Furthermore, it's often advisable to isolate the input of a motor drive with a transformer. This gets large, heavy, and if you have to buy it new, expensive.
The question: If I sold a relatively inexpensive fully-isolated power-factor-corrected, low-harmonic-distortion input multi-kilowatt 310-335V power supply for
220-240V motor drives, would anybody be interested. I'd price it so that the solution would be cheaper than buying an over-rated drive and a reasonably priced used transformer.There would be a 600-700V unit for the 480V crowd as well, though getting UL to sign off on that one will be a trip and a half.
The gist: would you buy a box that let you connect a motor drive to a single phase connection at full rating and fully isolated?
Any ideas (or thrown vegetables)? geoff