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Single phase motors can be used with a single phase VFD. It's not ideal and it is not really common.

3 phase motors can be used with or without VFD. Now, most VFDs hae some intelligence built in,...

Good call. And if you sell the controller you have, you might actually go a long way towards paying for the vfd solution.

No. A variable speed AC motor and a fixed speed AC motor are the same. The difference is the drive needed.
AC engines are controlled by changing the frequency of the input signal. For this, a...