Carl R. Friend wrote:
> On Mon, 01 Jun 1998 14:49:39 rigdonj_at_intellistar.net remarked:
>
> > Oddly enough a lot of the HP stuff is spec'd to run on 50 to
> > 440 Hz. I'm not sure why unless it's to allow it to also be used
> > in aircraft but that doesn't seem likely.
>
> Shipboard applications are frequently run at 440 Hz as well as
> aircraft; it's quite common in military environments as it keeps the
> transformers small. Actually, I believe it's 400 Hz, not 440, but
> whats a few ticks between friends?
It's generally 400 (plus or minus 50) hz for aircraft and associated
equipment (missiles for instance). Our test equipment racks for Air Launched
Cruise Missiles had a HP 1000 computer tied to an IEEE 488 interface and all
of that ran from a motor-generator that took 3 phase 220 volt _at_ 60hz to
power an electric motor that turned a generator similar to an aircraft's
engine driven generator.
The biggest advantage of the higher cycle rate is smaller packages and
cooler running.
Locomotives and (as you stated) larger water craft also use 400hz equipment.
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Received on Tue Jun 02 1998 - 08:41:31 BST