What is the advantage of using 115 volts 400 Hz alternating current?
Running at 115v 400Hz allows the use of smaller transformers. Less energy has to be stored in the transformer core per cycle, so the core can be smaller. A smaller core means a lighter transformer, and reducing weight is a good thing in an aircraft.
Why aircraft uses 400 Hz?
Aerospace manufacturing companies can achieve a lower weight by using 400 Hz power. With 400 Hz, airplanes require fewer generators or alternators to produce a sufficient amount of power. This reduces their total weight, thereby making it easier for airplanes to take off.
Why do airplanes use 28V?
The standard voltage for most integrated chips require 5V DC. However you would still find most cars have a 12/14V DC power supply bus. And similarly aircraft standard is 24/28V DC. So for a given power rating, a higher Voltage will mean lower Current and hence thinner cables and hence a decent weight reduction.
What is the difference between a 400 Hz and 50hz?
Induction motors turn at a speed proportional to frequency, so a high frequency power supply allows more power to be obtained for the same motor volume and mass. 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).
Is 400 hertz bad?
Generators providing 400 Hz power use less copper in their windings and smaller magnetic cores than those of 50 or 60 Hz – making them lighter. Given the relative short transmission distances in aircraft, the negative aspects of larger voltage drops at 400 Hz are not so serious.
Can humans hear 400 Hz?
Normal human hearing encompasses frequencies from 20 to 20,000 Hz, an impressive range. Sounds below 20 Hz are called infrasound, whereas those above 20,000 Hz are ultrasound. Dogs can hear sounds as high as 30,000 Hz, whereas bats and dolphins can hear up to 100,000-Hz sounds.