On 25-Oct-10 04:51, Jack Davidson wrote:
Knowing that this subject has been beaten to death, I still have one final question:
If you double up one side of a 3-phase rectifier and put the other wire to the other side, I still cannot see how full output can be achieved. You now have one doubled rectifier. OK, that one will provide doubled current, probably ot as much as the original, but double what the three-phase current would be for one leg. However, the other rectifier input will still be considerably less than the current capacity of a single-phase rectifier. It seems to me that you have just cut your regulator output to something considerably less than what it had with the original rectifier/regulator. Actually, it's a bit more than 1/3, as the newer 3-phase systems have more power output than this old one, but it would still drop the output capacity.
Someone explain to me what I'm missing, please. This is like any other AC or DC circuit, where any component that is rated lower than the rest will reduce the capacity of that circuit to its rating. I'd love to have a MOSFET regulator, but not at the expense of losing system capacity.
Jack in NY,___
The 3-phase rectifier will give the same output as a single phase rectifier, as the current depends on the alternator and not the rectifier.
However, as you are using 2/3 of the electronics when using a 3-phase RR in singla pahse mode, the current capability is also derated by 1/3, so you need to use an RR rated at least 45A to safely work as the single phase is 30A max.
Tom
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