Posted by Bob M on June 03, 2013 at 14:03:07 from (74.67.186.88):
In Reply to: 48v delco alternator? posted by George Marsh on June 03, 2013 at 13:05:20:
Most automotive alternators will develop 60 - 90+ volts when open circuited - ie. not connected to a battery. (A battery acts as a stabilizing ballast to the alternator output).
Presuming you can locate a suitable regulator, a Delco probably CAN successfully charge a 48 volt system. Issue is whether the rectifier diodes will hold up working at this higher voltage (they probably will). More problematic is whether the field/stator windings' insulation can withstand the greater "I squared R" heating losses that will be developed.
I'd suggest starting with a 24 volt Delco (plenty of them on Ebay), apply a custom-built regulator to it and see what you get.
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Not certain why many wind turbines use permanent magnet fields. I suspect it's for efficiency (no energy lost energizing field windings) and better low RPM performance. The downside is regulating a PM field alternator is more difficult/expensive.
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