You've got a 750W motor (1HP = 746W to be precise) and it's dual
You must open up the little electrical box on the motor and change the
links inside it from Y configuration as it is now, to delta (symbol
like a traingle) configuration. This is usually very easy - probably a
diagram on the inside or outside of the coverplate - but check it now
before buying anything. (Remember a 230V inverter produces 3 phases at
230V, not 3 phases at 400V as most machine shops would have).
I bought one of these from this selller:
for my 1100W bandsaw (an old 3-phase startrite 352) - extra power above
the rated power of the motor is a good thing.
You'll have a big fat manual to read, that isn't terribly clear. But,
virtually all inverters can be set up with something called "2 wire
control" or "3 wire control".
By using this, it is possible to wire up your machines existing
controls to control the inverter directly - a true fit and forget
My bandsaw (which obviously only runs in one direction) has the go/stop
buttons wired through to the inverter - and the speed control knob
(which I never use) is just left at max on the inverter.
For a lathe you will probably want 3-wire control (which allows
reversing) and you'll want to wire in the footbrake emergency stop if
you have one.
I think the best solution is to use the lathe gearbox to change speed,
and the inverter speed adjustment to vary the speed in that gear - and
most of the time to run the inverter at full speed (the inverter varies
the speed by reducing the mains frequency from 50Hz, which reduces the
If your lathe has a clutch (so that the motor remains running whilst
the chuck comes to a quick stop) you could possibly wire the inverter
to power the motor only and no control wiring (nice and simple), but
you will need to use the little control panel on it to turn the motor
on and off (important: inverters must start the motors themselves - no
suddenly dropping the load onto them with a big clunky switch - or
disconnecting the load the same way - the inverters internal
electronics must be allowed to do this).
Overall. Checking your motor is suitable - easy. Buying something
suitable - easy. Wiring it up requires some confidence with wiring
machinery and understanding a fairly complex electronics manual. But
the overall solution is worth it. I'm very happy at the solution I