Originally Posted by
karlden
Three phase rectified power has no points where the resultant DC voltage is zero, unlike single phase. Use of rectified three-phase power therefore can avoid the need for large capacitors to even out the DC voltage under load.
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The other reason for smoother DC on three phase F.W. is not only less ripple amplitude but the ripple frequency is 6x the supply freq. as opposed to single phase FW being 2x the supply freq.
However I suspect in the posters machine, that although a 3 phase transformer was used, it fed three single phase transformers for 3 independant supplies?
Al.
CNC, Mechatronics Integration and Custom Machine Design
“Logic will get you from A to B. Imagination will take you everywhere.”
Albert E.