I am winding my own small three phase ac alternator and have learned about star and delta connections. Should I use 2 three phase rectifiers to turn the current to DC or only one with a star connection on the other end?
EDIT: To be more clear, there are 3 sets of wires which current will be induced to. Most alternators take the first end of each set of wires to make a 3 phase current, but take the other ends of the wires to make either a star or delta connection. Why not just have another three phase output for twice the power output? Note I am also using rectifiers to change the AC current to a DC current (I am using a three phase alternator so the output of the full wave rectifier will be smoother).
Electrical – Why use a star or delta connection instead of having a second output
acalternatorcurrentdeltathree phase
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Best Answer
Delta is generally preferred as it gives higher voltage, lower currents and conduction losses. This requires 2 diodes per phase as there is no Neutral return. ( 6 diodes for 3 phase )
Star (or Y or wye) config is preferred;
when the voltage is too high for the added cost of insulation required but needs only 1 diode per phase and neutral.
Alternatively, it is used when when the higher current is desired for maximum power transfer when impedances are closed to being matched.