Re: [CAD_CAM_EDM_DRO] Rotary Phase converter design?

I'm looking for ideas on a phase converter I need to set up.

The Motor I plan to use is a ~1750 RPM 15 Hp 3 phase 220/440 motor.

It is New, and bought as lost/damaged freight. I don't see any damage,
but there is half a mangled shipping sticker, so I can only assume
it was lost.

It weighs about 200#.

I don't expect to be able to get to capacitor start with that much mass.

I'm not going to bother.

I have several other single phase 220V motors to start it up.

I was going to set up a clutch arrangement.

Then I started thinking, maybe that is a waste of time.

What if I simply gear it slightly higher than the 3 phase idler
so that after it is running the pony motor is running at 18 or 3600 RPM.

Would it be pulling any current?

Should I disconnect it from the line?

If so, should the leads be grounded? connected to each other?
Left open?

Is there an advantage to making sure the motor and electrical
phase are in sync before throwing it online?
This sould be fairly easy to do by sticking a sensor on the
motor shaft to identify the phase of the motor, and a zero
crossing detector on the power line.



Before we get off on this being too big, or whatever, I already have
the motor. I don't think it is THAT much larger than I may need now,
and Who knows what eqpt I'll buy tomorrow, that is a killer deal because
it is three phase and few people are interested.

Marc