alt swit
Bud - So just to check that I understood, I could have the ALT ON and the
BAT OFF without harming the electrical system?
Will
William Daniell
LONGPORT
+1 786 878 0246
On Fri, May 15, 2020 at 9:56 AM budyerly@msn.com <budyerly@msn.com> wrote:
>
> Sorry for the long delay. My virus protection doesn't like the matronics
> site.
>
> As for the ROTAX alternator. It is a dynamo so it does not require
> electrical excitation of the field circuit as there is none. Even the
> ignition coils in the stator are self generating. Pretty simple, basically
> a big lawn mower electrical system. So either battery, dynamo (ROTAX
> alternator), or both is not going to hurt a thing.
>
> Your automotive or standard alternator (even certified aircraft) require
> voltage to excite a field current before the rotating coils can provide
> power. Alternators are lighter, more powerful and cheaper to make watt to
> watt.
>
> An alternator is dependent on the battery to initiate the field. Cut the
> field and battery in a Cessna, then turn on only the battery, and the
> alternator will not fire, unless there is residual voltage stored in a
> capacitor in the system with enough energy to excite the field coil. To my
> limited knowledge of all solid state equipment currently available, that
> power backup to the main bus to excite an alternator field is no longer
> available. All backup batteries simply power the box only.
>
> Best Regards,
> Bud Yerly
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=496378#496378
>
>
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