Please propose a simple and efficient circuit for building three-phase system from single-phase one.
Dear Iman Sadeghkhani, Get an article available at following link.
http://www.jsst.jp/e/JSST2012/extended_abstract/pdf/84.pdf
Dear Iman Sadeghkhani, See an my article: Shustov M.A. Wide-range formers of three-phase voltage and their application // Electronics World. – 2010. – V. 116 (1890). – № 6. – P. 45.
You can use the scott connections method as suggested by Bhupendra Sir.
But you should use a single phase transformer with 50 percent tapping and a teaser transformer with 86.6 percent tapping for that. Take care to eliminate the harmonics in the output single phase supply.
(A) In electrical locomotive, single phase to three phase conversion is done using Arno Converter. It is in fact three phase induction motor running on single phase supply without any mechanical load. Single phase supply is connected to any two terminals of star connected stator winding. For starting one can connect a capacitor with a switch to one terminal of supply and the third terminal. When the motor starts running remove the capacitor. The rotating magnetic field induces three phase EMF in the three segments of winding. The voltage thus obtained is having phase as well as magnitude unbalanced. Due to nature of the three phase voltage, the motors on board of the locomotive like compressor motor, pantograph mover etc. are to be specially designed to produce effective torque even when the supply is unbalanced .
(B)For experimental purposes, the three phase perfectly balanced supply can be made available by precisely selecting the number of turns of an Scott connected transformer.
Recent philosophy in Locomotive is to replace the Arno Converter, by solid sate three phase Perfectly sinusoidal Inverter. This allows one to use motors normally available.
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