Re: Batttery Cable Hookup

Posted by BF8690 on May 14, 2007 at 14:08:24 from (138.163.0.41):

In Reply to: Re: Batttery Cable Hookup posted by Bob M on May 14, 2007 at 12:47:31:

Actually, there is no such thing true as direct current. All current has some sort of alternating effect. DC is created from AC through a Rectifer circuit of some sort. The old days they used points, nowadays they use diodes. The most efficient DC systems are created from generators/alternators with multiposts or multiple phases. In otherwords, a 6 phase generator can produce more efficient DC than a 3 phase. Conversly, the more frequency the more efficient the created DC is. So, the generators we use on aircraft are 3 cycle,110 VAC, 120 degrees per phase, and rotate at 400HZ. Because of the high HZ it creates DC with very little ripple effect. What a rectifier does is pull voltage off of the top portion of the positive part of the AC sign wave. The more of these the less ripple effect you have because the gaps between pulses are tighter. Frequency will always be there. It takes super sensative equipment to see it in DC voltage, but it's there. Have you ever passed a car or a motorcycle and see the head lamp pulsing? That is the first sign of a voltage regulator going bad. The regulator is actually a rectifier/regulator. So you guys are correct in that AC will have an increased skin effect but that does not mean that DC will not have a skin effect at all. Because DC is really a pulsing signal, it just doesn't go through the full sign wave, the signal will fluctuate minutely so it does have skin effect. Contraray to popular beilief alternators are really AC generators but instead of having 3 phases it will have many more, some as many as 12.

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