# What is the advantage of using 115 volts 400 Hz alternating current?

## 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.

## What is the main reason for using 400 Hz instead of 60 Hz AC power supply in the aircraft?

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).

Why does military use 400Hz?

So for the short distances involved in aircraft, and the advantage of smaller and lighter transformers, motors and filter capacitors, 400Hz was adopted, particularly for military aircraft: MIL-STD-704F states: â€œEquipment designed for use on military aircraft should not use 60 Hz power, since it requires more weight and …

What does a frequency converter do?

A frequency converter is an electric device that converts a current with one frequency to a current with another frequency. The voltage is normally the same before and after frequency conversion. Frequency converters are normally used for speed regulation of motors used to drive pumps and fans.

### 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.

### Why do aircraft have both AC and DC power?

Since on planes, both redundancy (safety) and weight (economy) are both massive factors in cost. It is actually economical to run power on AC, and convert to DC where necessary. The size, weight, and cost of switchgear for DC-DC conversion at any given power is much higher than AC-AC and AC-DC conversion.

Would you expect a 400 Hz generator to be larger or smaller than a 60hz generator of the same power and voltage rating Why?

Yes, the generator is a lot smaller, but overall size is effectively limited by the total power generated/transmitted.

Would you expect a 400 Hz generator to be larger or smaller than a 60Hz generator of the same power and voltage rating Why?

## Is VFD a frequency converter?

A variable frequency drive is not a typical converter though it has conversions inside it. A converter would typically convert a DC signal to an AC signal vice versa. You do get variable frequency drives that can convert single phase AC to 3 Phase AC then in that case it is a converter but not a typical one.

## What is the difference between frequency converter and inverter?

A frequency inverter is often confused with a frequency converter since both appear to change output voltage, frequency and amperage. The primary difference between the two technologies is that the inverter section in a converter attempts to maintain consistent voltage and frequency output regardless of current output.

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