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why 400Hz is used for aircraft systems ?
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Answer Posted / shamas ul hasan
Transformers, for example, can be made smaller because the magnetic core can be much smaller for the same voltage level. 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.
A United States military standard MIL-STD-704 exists for aircraft use of 400 Hz power.
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