I am helping a friend who has an AC motor that was originally wired to run on 220VAC but from the looks it is wired to use two capacitors to (somehow) convert a single phase to a 3 phase... the goal is to use a VFD to control its speed/ramp rather than just on/off. I looked online and found a few pages (like this one) that discuss how a capacitor could have been used (and perhaps one is a start and the other a running cap?), but I am somewhat stumped about having 8 wires rather than the 6 I was expecting for the VFD. I understand that there are Y and Delta configurations where the coils are either in series or parallel, but that would mean 9 wires..? Am I missing something?
Unfortunately I have no mfg# or any specs... wires are also, annoyingly, not labeled.
Any idea on how I would go about figuring out what wire is/does what? I can measure resistances and inductance, but that is about it. I didn't want to hack at this any more than I need to before I have some strategy... but I suppose I could open it up in the hope of seeing something obvious? What I'm really after, is to get feedback on a good approach to determining what each of those wires does and then how I would go about connecting them to a configuration that is suitable for a VFD.
I'd greatly appreciate any thoughts on this... Thx, J