"Jon Elson" wrote in message
...
Very interested in what you have done! Did you use the IR kit design, or
somebody's microcontroller?

I have designed the control logic in an FPGA for a 2-phase motor on a
high-speed spindle, but still have a bunch of testing to do before it
would work.

Jon


I don't use a microcontroller. In order to keep it as simple as possible
i use two CMOS chips, 6 opto isolators and 3 IR gate driver chips
driving 3 GTR IGBT's. They idea is to offer an alternative to rotary
phase converters, just a very basic VFD that will work reliably the
first time you apply power.

When i started out on this project my thoughts were that most
people with a home shop only just want to run thier 3 phase machines
and make chips. They may not need or want a lot of bells and whistles
that commercial VFD's offer, they just want 3 phase power. Those
were the design parimeters i used to build my unit with.

I will sometime in the future design a interface that plugs into a
standard PC printer port for people that want to experiment
with controlling 3 phase motors via computer.

Best Regards
Tom.