On Oct 12, 7:32*pm, Steve wrote:
I am building a piece of equipment for the aircraft industry that uses
a 115V 400Hz electrical supply. * I have found I need to fit a cooling
fan (like a PC one but a bit wider - about 5 inches diameter) and have
got a 120V 50/60Hz one.
Will this work? *Impedance wise a higher frequency would mean less
current drawn by what is presumably a mainly inductive load, but my
main query is are fan rotation speeds related to the AC supply
frequency? *If so I guess trying to run a fan at about 7 times it's
rated speed would not be a good idea so I haven't yet tried it.

i'm pretty sure a 50/60 cycle fan wouldn't work; i agree with the guy
who suggested a DC one. plenty of DC muffin fans around, and DC is
universally producable. on the other hand, i don't know anything about
airplane equipment, although i still have an old war surplus 400 hz
motor/generator knocking around somewhere.