Producing Alternating current of high Frequency.

In summary: In addition to information provided, I found another method to generate high frequency AC, which is to use oscillatory circuits.
  • #1
amk_dbz
42
0
As the title suggests, how are very high frequency AC produced?
A AC generator must have a limit to the rotation velocity of the coil, mustn't it?
Any help would be appreciated.
Thanks.
 
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  • #2
How high in frequency are you thinking about?
 
  • #3
You can use electronics to generate everything up to several GHz, and electromagnetic waves (and corresponding transitions in atoms/metals for photons of specific energy) for higher frequencies.
 
  • #4
Look into electronics, they have crystals, oscillator circuits that generate RF and then amplify the higher current.
 
  • #5
amk_dbz said:
As the title suggests, how are very high frequency AC produced?
A AC generator must have a limit to the rotation velocity of the coil, mustn't it?
Any help would be appreciated.
Thanks.

The words "Radio Transmitter" come to mind as a possible answer for you. You can buy equipment off the shelf that will give you 250kW at 20MHz or 20kW at 500Mhz. But that's not done with rotating coils.
I'm not sure the highest frequency that has ever been generated with a rotating generator but I believe 400Hz is / was used for the AC supply in aircraft. One reason for using such a (comparatively) high frequency for this application is that motors and transformers can be made a lot lighter than if you use 56/60Hz. I wouldn't be surprised to be told of special rotary equipment having been made to generate tens of kHz or even more, though - before power radio valves were available.
You mention high rotation rates as a possible problem - True but it is possible to have many poles on a rotor, which can produce multiples of the basic rotational frequency. But there will be limits, imposed by the Inductance of this sort of generator (or distribution and load equipment), which would compromise performance.
 
  • #6
Thank you all for your Help...In addition to information provided, I found another method to generate high frequency AC, which is to use oscillatory circuits.
Thank you
 

What is alternating current (AC)?

Alternating current (AC) is an electrical current that changes direction periodically. It is the most commonly used form of electricity in homes and businesses, and it is produced by power plants and generators.

What is high frequency?

High frequency refers to the number of cycles per second in an alternating current. It is measured in hertz (Hz). In the United States, the standard frequency for AC is 60 Hz, while in many other countries it is 50 Hz.

How is alternating current of high frequency produced?

Alternating current of high frequency is typically produced through a process called electromagnetic induction. This involves passing a magnet through a coil of wire, which creates a changing magnetic field that induces an electrical current in the wire. The frequency of the current can be increased by increasing the speed at which the magnet moves through the coil.

What are the benefits of producing alternating current of high frequency?

There are several benefits to using high frequency AC, including the ability to transmit electricity over long distances without significant loss of energy. It is also more efficient and cost-effective for powering electronic devices and appliances compared to direct current (DC).

What are some applications of high frequency AC?

High frequency AC is used in a variety of applications, including power transmission, electric motors, and radio and television broadcasting. It is also used in medical equipment such as X-ray machines and laser surgery devices.

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