Star or delta connection, I believe refers to the way the motor leads are hooked up. I don't believe that you need a transformer to do this alteration. Actually, the whole three phase system in one building is likely wired up to be one way or the other.
There are several sets of windings in a 3 phase motor, and I suppose that an electric motor rewinding shop would be the guys to talk to about whether your motor can be hooked up in a delta configuration, rather than star configuration.
I'm supposing that the star connected motor behaves like a dead short when connected to the delta configured 3 phase.
Sorry, I can only conjecture a bit about this, but if you can talk to a motor rewinding technician, he can tell you what is what with your specific motor.
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