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I've heard many great things about sunray.

It is true that if you go very low in rpm, than is kinda bad for the motor. Especially if it is a 3450 rpm drive, because in order to make it go slow, you'd have to get the frequency to half what you...

There is probably a miscommunication, because a 3p motor can run indefinitely on a VFD.
In fact, most motors in our plant are continuously controlled via a VFD, and run for years and years on end.
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Because variable speed using a frequency convertor is a lot easier using 3 phases. 3 phase is industry standard.
My grinder has a 3 phase drive. The frequency convertor is 1 phase, but outputs 3...