Re: [CAD_CAM_EDM_DRO] Help

Aaron wrote:

>I am converting my bridgeport r2e3 to run the control circuit on single phase, but maintaining the 3 phase motor running on a statis converter. Does anyone know what the purpose of the large transformer at the top right side of the power enclosure is for. All of the other transformers have been easily converted to single phase, but this transformer just has 3 phase supplies in and 3 phase supplies out. There are no neutrals. Forgive my poor understanding of transformers, but I thought you needed a live and neutral into a transformer to generate a field etc...
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I believe this is the stepper motor power supply. They generally are
3-phase on all the BOSS
and such Bridgeport machines. No, you don't need a neutral with 3-phase
power, as long as
the power demand is balanced. The transformer windings run from one
line to the other line.
This is called a Delta winding. There is also a Wye winding possible,
which has a neutral
junction of the windings, but the neutral does not need to be connected
externally.

Jon