[Syrah]

So lately I've been reading about how the AC synchronous motor works on a TT.

I have a VPI TT that uses a 300 rpm motor.  It's powered by a PS Audio P300, which allows fine hz tuning.  Great for locking in speed.

A little knowledge being a dangerous thing, I've read that an AC motor has 4 connection wires.  The idea is that the AC phase is split between them with a capacitor.  So hot and neutral on one side of the motor, opposite phase hot and neutral on the other side.  Is this right, so far?

If so, is each side seeing 60v out of phase?  Or does the cap invert phase on 120?

If I had 240v, and wired up an iso trannie to give balanced 120-0-120 power, could I use that instead an bypass the cap?

From what I've read, the problem with noise on the motor is often that there's some mismatch between the phases - which is why the (no longer available) Mark Kelley unit was useful for allowing the adjustment of each phase.

Any knowledge on this?

Thanks,
Fraser

[Syrah]

Just to take this one step further, is the problem that the frequency of each phase is off, or the motor is off and needs two slightly different frequencies for each phase?

If so, I actually have two P300.  If I fed each of them with 60-0-60 balanced power, then used one leg from each of them, I could adjust the frequency of each independently.