>>. Can someone more
>>electricly inclined than I explain why some mil equipment some as missile
>>systems and sonar systems run at 400HZ / rather than 60HZ?
>
>For inductive components (transformers, motors, etc.) the higher the
>frequency (within reason else other problems crop up) the smaller the device
>to achieve the same end goal. Why 400Hz in particular was standardised on
>I'm not sure but the reason for the high frequency is weight and size
>reduction of the components. The avionics systems I was involved with all
>ran on 120VAC 400Hz 3 Phase-Y and 28DC, which I think is pretty typical of
>aircraft stuff in general??
>
Spot on.
A 400Hz supply does indeed mean small, light transformers and also the
unreliable high value electrolytic capacitors in PSU's can also be designed
out.
3Ø supply in 400Hz star and delta configurations are common on UK warships too
along with 1260Hz supplies mainly used in synchros and resolvers.
Richard
(Southampton UK)
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