Hz

[Ron82nd]

How Do i bump up 60hz to 20khz

 

[charlie b]

With a motor generator set or with an electronic power supply.

 

[crossman]

With a motor generator set or with an electronic power supply.

To get 20kHz out of a genset may be pushing it!:smile:

 

[winnie]

To answer the OP, you would almost certainly use some sort of electronic synthesis of the 20kHz. The details of this would debend drastically on things like the required fidelity and power levels.

Crossman:
Actually, generators have been built that operate up to 100kHz and many kilowatts; they were used in the early days of radio.

They were reluctance alternators, with a stationary DC field coil, and a stationary AC output coil, and a variable reluctance path. The total magnetic flux would change as the reluctance of the path changed, inducing voltage in the output coil.

http://en.wikipedia.org/wiki/Alexanderson_alternator

I think that you might be able to cobble together a modern version of such an alternator using a stepper motor.

-Jon

 

[drbond24]

Several companies sell frequency converters which are just motor-generator sets like Charlie said. I was involved in the installation of one that was from Power Systems and Controls.

Edited multiple times to fix the link. I've never tried to change the label before.

 

[crossman]

Thanks for that info, Winnie. I was looking at a standard genset and the formula RPM = (f x 60)/pairs of poles. The alternator you linked to is interesting, using something akin to the way an electric guitar pick-up works. Thanks again for clueing me in.:smile:

Of course, with today's technology, electronic creation of the 20kHz would be the way to go.

 

[crossman]

Several companies sell frequency converters which are just motor-generator sets like Charlie said. I was involved in the installation of one that was from Power Systems and Controls.

The highest frequency I saw on that link was 400Hz. As winnie mentioned, it takes a very special alternator to create a frequency as high as 20,000 Hz. I seriously doubt that they are commercially available today. Much easier to do it electronically.

 

[drbond24]

The highest frequency I saw on that link was 400Hz.

You're right. Oopsie. I saw frequency converter and started to reminisce without paying enough attention to the OP. Sorry.

 

[crossman]

without paying enough attention to the OP. Sorry.

You and me both. I've caught myself making several snafus lately because I didn't read a post clearly. I blame it on old age and becoming senile.

 

[drbond24]

I blame it on old age and becoming senile.

I can't use that reason since my age still starts with a 2.

I'll have to just own up to it and say that I goofed. I usually say 'the sun was in my eyes,' but that wouldn't really be plausible here.

 

[crossman]

'the sun was in my eyes,'

I can go with that one!:smile: