The use of 400hz electrical components in aircraft
The use of 400hz electrical components in aircraft
(OP)
Can someone enlighten me how the 400hz power common in transport aircraft came to be chosen?
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The use of 400hz electrical components in aircraft
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RE: The use of 400hz electrical components in aircraft
B.E.
The good engineer does not need to memorize every formula; he just needs to know where he can find them when he needs them. Old professor
RE: The use of 400hz electrical components in aircraft
400 Hz
Frequencies as high as 400 Hz are used in aircraft, spacecraft, submarines, server rooms for computer power, military equipment, and hand-held machine tools. Such high frequencies cannot be economically transmitted long distances, so 400 Hz power systems are usually confined to a building or vehicle. Transformers and motors for 400 Hz are much smaller and lighter than at 50 or 60 Hz, which is an advantage in aircraft and ships. A United States military standard MIL-STD-704 exists for aircraft use of 400 Hz power.
http://en.wikipedia.org/wiki/Utility_frequency
John R. Baker, P.E.
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RE: The use of 400hz electrical components in aircraft
thread16-34515: aircraft power supply 400 Hz and beyond?
thread238-47291: 400 Hz power
thread248-26254: Why 400 Hz in mainframes?
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RE: The use of 400hz electrical components in aircraft
B.E.
The good engineer does not need to memorize every formula; he just needs to know where he can find them when he needs them. Old professor
RE: The use of 400hz electrical components in aircraft
Sperry gyroscope had something to do with it ( way back in the 1920s i think ).
UH-1Bs had 400 cylce MG sets. 28 volts DC in, 400 cycle 3 phase out.
You could run your electric percolator on it. Easier to find and cheaper than a 28 volt DC coffee pot.
RE: The use of 400hz electrical components in aircraft
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RE: The use of 400hz electrical components in aircraft
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RE: The use of 400hz electrical components in aircraft
As well as a double ended battery shop (one end for Lead-Acid and one for NiFe or NiCd), most bases also had a soundproof inverter room where you could sit with your earplugs in underneath your duffs while setting up your screaming 100A inverter and still hear the anguished calls from people outside begging you to finish off quickly because they couldn't hear themselves think.
I remember an unscheduled landing in a field in the middle of Salisbury Plain 20+ years ago so I could look up which systems were fed off the inverter that had just wrapped its hand in.
A.
RE: The use of 400hz electrical components in aircraft
For some background on this issue and why it died, go to:
http://www.popularmechanics.com/cars/news/4226979
John R. Baker, P.E.
Product 'Evangelist'
Product Engineering Software
Siemens PLM Software Inc.
Industry Sector
Cypress, CA
Siemens PLM:
UG/NX Museum:
To an Engineer, the glass is twice as big as it needs to be.
RE: The use of 400hz electrical components in aircraft
The 28 volt system was powered from a main generator mounted on the trasmission, a starter-stand by generator on the engine or the battery.
I think Blackhawks have 400 Hz main generators. there's air show comming up in a couple of months. I'll find a crew and talk to them.