I assumed you are asking for a induction motor VFD?
For N.A. 220/240 you ignore the centre taped neutral and use the L1-L2 legs for 240vac.
The typical induction motor VFD not only creates a 3 phase sine wave but modulates it with PWM for energy content of the 3phase.
I can do that. I can create nice sine waves with something as simple as a 555 timer IC. And then PWM those using an Arduino. So I don't see where there should be a problem producing perfect sine waves. Using three sine wave generators I can phase those three sine waves relative to each other however I want. So I'm not real worried about that end of the circuit. There are probably even better chips to use for generating precise sine waves. I'm from the old school so a 555 IC is the first thing I grab.
In any case, here's the motor I ultimately would like to drive. Don't be discouraged by the appearance. It actually turns as smooth as a Swiss watch.
Here's the tag on it. It's 1-1/2 HP, 220 volts, 4.2 amps.
I just want to do this as a learning experience.
It doesn't matter if I burn this motor up, or blow up the VFD.
And I know better than to touch any high voltage parts. I have great respect for electricity. I do all my own house wiring by the way, so it's not like I haven't worked with 110 and 220. I work with them all the time.
I would just like to learn how to build a dependable VFD..
Just for the record (in case you might be curious), I am hoping to purchase a few machines this summer. A lathe, a milling machine, and a surface grinder. These are all old and rusty (kind of in the same shape as the motor in the photo above). But they will all come with 220v 3-phase motors on them.
I could swap the motors out for single phase motors. In fact, I was going to do that originally. But the guys on the machine shop forums tell me that the 3-phase motors are much better and smoother running with more control.
I could also run out and buy a brand new VFD for each machine, but hey, if I can build my own why not? Not only will I save money, but I'll also learn a lot about them, and I'll be able to repair or customize them as needed. I might also be buying more 3-phase machines in the future as well.
So anyway, that's the story.
I'm willing to take things slowly. As I've said, I would really like to experiment with some low-voltage 3-phase motors first to perfect the design. Like 12 or 24 volt 3-phase motors. Only after I get that down pat will I move up to trying the 220 volt real thing.