starlaker
Joined: 24 Jun 2006
Posts: 16
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 Posted: Fri Jan 19, 2007 11:45 am Post subject: 912S alternator Was: RE: Kitfox list just like the Lancair |
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Dick writes:
There may be some confusion as to the correct term to use, but in the parts list it is called a magneto generator. It has a magnetic ring that rotates around a static winding assembly and generates alternating current which is converted to direct current at about 14 volts by the rectifier regulator. This is confusing to me because I tend to think in automotive terms were a generator produces DC and an alternator produces AC.
Note that there are separate windings on the stator for charging and ignition. So even if your charging circuit is not producing power, through the rectifier regulator, ignition power is still available. So you should be able to hand prop the engine even if the battery is dead. Once the engine is running, (and you can still count to ten on your fingers, hopefully) will the battery charge?
That depends. On my kitfox the output of the rectifier regulator (terminal B) goes through the master switch on its way to the battery. Also the rectifier regulator control (terminal C) is energized through the master switch so if the battery is so dead that it can't actuate the master switch, no charge can get to the battery.
Dick
"The Dynamo was the first electrical generator capable of delivering power for industry. The dynamo uses electromagnetic principles to convert mechanical rotation into an alternating electric current. A dynamo machine consists of a stationary structure which generates a strong magnetic field, and a set of rotating windings which turn within that field. On small machines the magnetic field may be provided by a permanent magnet; larger machines have the magnetic field created by electromagnets."
In the 912 permanent magnets are used. Note that the dynamo produces alternating current. It's a very simple and reliable way of generating electrical power. It is quite different in structure from an automotive alternator, which produces
Nolan Donahue wrote: [quote] | Quote: | --> Kitfox-List message posted by: Nolan Donahue <nolan_donahue(at)yahoo.com>
I'm not sure exactly what type of charging system the
912 has (I think it's an alternator bult into the
flywheel) but no matter what type it is, most
airplanes will not charge a dead or nearly dead
battery because the solenoid that connects the battery
to the rest of the electrical system requires battery
power. So when you flip the master switch, if the
battery has no juice, the battery cannot be connected
to the alternator, generator, stator etc it makes no
difference if the engine is running or not. Some of
the master relays may require more juice than others
but they all need some. It's like when you try to
start your car with a dead battery, and you hear the
solenoid clicking, without enough juice to fully
engage the solenoid.
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Dick D'Archangel
Classic 4 6061D |
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