baobab72
5th May 2011, 17:55
Dear All
i am not sure i am posting in the right section of the forum, anyway i am about to do my BFR and probably i will do it in a C172. As i was reviewing the systems, i came across the electrical one, and one doubt crept into my mind: how does the alternator work? does it have a stationary field coil supplied with a trickle charge from the battery and a rotating armature driven by the engine via a drive belt and coupled to a commutator turning AC into Dc or is the armature stationary and the coil rotating? In case of an overvoltage in excess of 31.5Vdc, a breaker will trip, discontinuing the trickle charge from the battery to the field coil, causing the electromagnetic field to collapse and then voltage of the alternature to drop, taking the alternator offline as reflected by a decrease in Volt ( to 0?) and by a discharge on the ammeter as the load placed on the battery is increased?
Many thanks for your replies.
Baobab72
i am not sure i am posting in the right section of the forum, anyway i am about to do my BFR and probably i will do it in a C172. As i was reviewing the systems, i came across the electrical one, and one doubt crept into my mind: how does the alternator work? does it have a stationary field coil supplied with a trickle charge from the battery and a rotating armature driven by the engine via a drive belt and coupled to a commutator turning AC into Dc or is the armature stationary and the coil rotating? In case of an overvoltage in excess of 31.5Vdc, a breaker will trip, discontinuing the trickle charge from the battery to the field coil, causing the electromagnetic field to collapse and then voltage of the alternature to drop, taking the alternator offline as reflected by a decrease in Volt ( to 0?) and by a discharge on the ammeter as the load placed on the battery is increased?
Many thanks for your replies.
Baobab72