mikekilroy - that is a very good point re the voltage to the motor - maybe it isn't 230V on each phase. That had crossed my mind. It is such a big motor, it could do pretty well with 160V drive. I'll check when it is running although I doubt I'll be able to fully load it to challenge the VFD...
Thanks for the replies.
Squeeky, thanks for the safety tips! Yes, I was reading that simple VFD designs can induce plenty of power source distortion. I think this is because they probably employ a simple diode bridge or equivalent to get the high voltage DC. This technique has a poor power...
Some background . . . I am a EE with general electronics, biomedical instrumentation, computer and embedded processing and some power management circuit design (switching supplies, buck, boost, maximum power point tracking). I have been interested in exploring computer control of 3 phase AC...
