CAT3C AUTOLAND
13th Mar 2002, 22:14
Guys and Gals (ATPL students or current engineer/pilots). .. .I need some help please. I am just doing some PPL revision in preparation for practical flying, and have a question. I am not sure whether I am going too deep here for PPL studies, but I have been reading and reading and reading and getting interested. I must point out that electrics is not my strong point!. .. .With reference to AC generators I would like to know if I have understood the following about external excitation.. .. .Am I correct in assuming that a Generator winding and core that is externally excited via the battery source to create the electro magnet is constantly fed with electrical current from the battery to excite it, or does it become self exciting once the engine has been started? My train of thought, is that, if the battery failed the external excitation source would fail, therefore the alternator would not provide the output voltage to the bus bar and electrical power would be lost all together, is this correct?. .. .I hope the above makes sense! Any responses would be greatly received, as it is doing my head in <img border="0" title="" alt="[Smile]" src="smile.gif" /> .. .. .Thank you.. .. .CAT 3C AUTOLAND.