Producing Alternating current of high Frequency.

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Discussion Overview

The discussion centers on methods for producing very high frequency alternating current (AC), exploring both theoretical and practical aspects of AC generation, including the limitations of traditional AC generators and alternative electronic methods.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested

Main Points Raised

  • One participant questions the maximum frequency achievable with traditional AC generators, suggesting that there may be limits related to the rotation velocity of the coil.
  • Another participant asks for clarification on the specific frequency range being considered.
  • Some participants propose that electronics can generate frequencies up to several GHz, and that electromagnetic waves can be used for even higher frequencies.
  • It is mentioned that radio transmitters can produce high power outputs at specific frequencies without relying on rotating coils.
  • A participant notes that while traditional generators may be limited to around 400Hz, there are special rotary generators that could potentially produce higher frequencies, although performance may be compromised by inductance issues.
  • One participant shares that oscillatory circuits can also be used to generate high frequency AC, indicating an additional method beyond traditional generators.

Areas of Agreement / Disagreement

Participants express various viewpoints on the methods and limitations of generating high frequency AC, with no consensus reached on the best approach or the highest achievable frequency using different techniques.

Contextual Notes

There are unresolved questions regarding the specific frequency limits of different generation methods and the impact of inductance on performance in rotary generators.

amk_dbz
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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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How high in frequency are you thinking about?
 
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.
 
Look into electronics, they have crystals, oscillator circuits that generate RF and then amplify the higher current.
 
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.
 
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
 

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