Hi,
I have built a rotary phase converter and it worked great for over 10 years
We used a older GE 50hp motor with 9 leads coming out as a idler.
I used a pony motor to start it as it is quite big.
Only problem was that the incoming voltages were to high 240V phase to phase or 120v line to ground respectively
I installed a buck boost transformer and got the power down to 219V phase to phase.
However Line to ground is 118v and 89v respectively
This was not an issue for a number of years and was great. A few capacitors and the phase to phases were all 220 + - 5%
Well the bearings went on the idler and somehow parts disappeared ( I was a couple months getting back to it)
I bought another 50hp dual voltage motor with 12 leads.
I installed this new motor and hooked it up Delta low voltage and turned it on. The motor immediately "bogged" down.
I've tried a few different hookup configurations and get the same thing.Wye etc.
I took the motor over to a shop with 3 phase power and the motor worked fine on 220v drawing about 30 amps.
Now I am stumped.
Is it because of the Buck boost Transformer? Is there a problem using a 12 lead motor?
Anybody got a thought?
Thanks for any input.

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