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Hi, I'm Mike and I'll be assisting you. Please stand by while I review your question.
Only 2 boost transformers are required. To select and see how to wire go to Hammond Power Solutions online PDF
All I can say is that you only need 2. Why others have 3, I can't say. Go to the PDF suggested for the info.
One more thing. I would think that the motor being 50hz and our electric being 60hz would cause a problem.
Only wanted to bring it to your attention.
Might want to check out "gohz.com" for a take on motor burn out with use of different Hz.
The equipment I gave was a buck boost transformer not a single 3 phase transformer. You may use either.
The motor will either have designated terminations or wire colors as shown on the wiring diagram