On 2011-07-06, GeoLane at PTD dot NET GeoLane wrote:
On Tue, 05 Jul 2011 12:18:23 -0700, Tim Wescott
wrote:



Close. Testing a mass of sophisticated equipment that gets crammed
into a small cargo aircraft.

It seems like a 60Hz to 400Hz converter would be a common accessory in
avionics shops -- or do they go for avionics prices?


Why do they use 400 Hz for anything?

Transformers and AC electric motors (plus things like synchros,
servos and resolvers) are a lot smaller and lighter (much less iron
needed at that higher frequency) -- real benefits in aircraft. Included
in the motors are the gryo motors as part of a navigation system, and
the syncros or resolvers to transmit the information to the panel
instruments.

Enjoy,
DoN.

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