208 volt 3 phase 60 cycle 7 1/2 HP motor with a 220/440 3 phase 50 cycle power supply

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lpalmer

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California
Does anyone have any suggestions for providing a cost effective and compact method to supply a 208 volt 3 phase 60 cycle 7 1/2 HP (shaper) motor from a 220/440 Volt 3 phase 4 wire 50 cycle power supply? The motor is a shaper going to Nigeria for the Mambilla Baptist Hospital, used to make the raised panel wood doors.
Some things I have been considering; Rotary phase converter, Transformer and VFD.

Thank you for any input,

Mr. Lynn Palmer
 
LarryFine said:
Unless it's a transformer secondary, how can it be both voltages?

My guess is high leg delta.

IMHO either the VFD or rewinding the motor are good choices. Rewinding the motor will mean that it operates at 5/6 rated speed. The VFD will let you operate the motor at full speed.

A rotary phase converter would be essentially useless; you already have three phase power.

A transformer would work, but the motor is already a transformer, so why have two transformers in series?

-Jon
 
No mixing

No mixing

I won't mix Hz.
If anyhting goes wrong later they don't have our parts there.
They don't know what that other piece is. (idiot proof it)
They will ponder, what does that does. We don't need, poof, there goes the service.
Look Smart, Be Smart, Act Smart ...
They make all kinds of the right things, its Electric, match what they need. IMO ...
 
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