Reversing an induction motor with no centrifugal switch

[Fazerruss]

Sorry I weren't clear. The 1,2,3 are where the wires terminate.

No 1 has mains in to three of the wires from the windings
No 2 has mains in to two wires from windings and a connection to the cap
No 3 has one wire from the windings to the other connection on the cap.

Could it be a three phase motor wired like below to run on single phase on the cheap?



It's exactly like this from new running of a standard 13 amp plug through a standard NVR switch. It's always worked fine and runs smooth.
No VFD and if it's star wired could it be a low voltage 3 phase motor if such a thing exists?

When I wired up my three phase mill to run off a VFD I had to change it to delta but this is the wrong way around.

 

[Matrixx]

Star is phase to neutral 230V across the windings. Common neutral (artificial) star point.

 

[Seadog]

Now we're getting somewhere

It would seem that your diagram is the only sensible solution, but i find it difficult to believe that you could connect two phases together like that and get the motor to run. HOWEVER, I've never tried so it seems that it must. Each of the windings should have a phase difference of 120° between them. The capacitor gives a 90° shift which is adequate for the second phase...
Despite the new information I still think that moving the mains lead from 2 to 3 should do the trick.
Put it all back together, give it a quick burst of power and see what happens

 

[Fazerruss]

If I move the mains in from 2 to 3 could that not put more current through cap and coil 1?



What about effectively swapping coil1 and the cap? ( the cap would be between the centre point and coil 1)

I think I'll try swapping the polarity of coil 1 first to see if that works. Hopefully it will have the same effect of swapping the starter winding wires around on a normal single phase motor.

If I set my hair on fire it's obviously not worked

 

[WorkshopChris]

What are the resistance readings for each of the 3 windings?
This will give us a better idea of exactly how its configured.

 

[Fazerruss]

What are the resistance readings for each of the 3 windings?
This will give us a better idea of exactly how its configured.

~7 ohms between each pair of wires from the coils

 

[Fazerruss]

Update: swapped the polarity of coil 1 and now the motor runs in reverse. Result.