Increasing AC frequency

Mon Aug 15, 2011 5:41 pm   

Guys:

I'm looking at an application where it would be advantageous to have
an AC mains frequency of around 500 Hz (120 V), rather than the
standard 60Hz. Is there a simple/economical way to convert from 60 to
500? It doesn't have to be variable.

Don

Mon Aug 15, 2011 5:41 pm   

On Mon, 15 Aug 2011 08:41:20 -0700 (PDT), eromlignod
<eromlignod_at_aol.com> wrote:


Static inverters and motor generators are the usual industrial ways,
although 500 Hz is (AFAIK) rather rarer than 400 Hz.

--
Rich Webb Norfolk, VA

Mon Aug 15, 2011 5:41 pm   

"eromlignod"


** Lotsa roos loose in this guy's top paddock.




** Thank god for that.



..... Phil

Mon Aug 15, 2011 5:41 pm   

On Mon, 15 Aug 2011 08:41:20 -0700, eromlignod wrote:


400Hz is a common frequency on airplanes, because the distances are
shorter and the transformers cheaper.

"Simple" and "economical" are slippery words -- compared to a line cord,
no, there is no simple and economical way. Compared to the cost and
complexity of what you need to power? How should we know, you haven't
said!

--
www.wescottdesign.com

Mon Aug 15, 2011 5:41 pm   

"Tim Wescott"



** That explanation makes no sense to anyone.



..... Phil

Mon Aug 15, 2011 5:43 pm   

On Tue, 16 Aug 2011 02:21:35 +1000, Phil Allison wrote:


Thank you, anyone. I'm sorry that you don't understand. Some knowledge
of basic electromagnetic theory would go a long way to alleviating your
problems in this regard.

--
www.wescottdesign.com

Mon Aug 15, 2011 8:13 pm   

"eromlignod" <eromlignod_at_aol.com> schreef in bericht
news:e2b0dbfd-4e1e-4d6a-a5dd-f9848763ba01_at_h14g2000yqd.googlegroups.com...

Get a 500Hz oscillator, an audio amplifier and an (audio) transformer.

petrus bitbyter

Mon Aug 15, 2011 9:46 pm   

On Mon, 15 Aug 2011, eromlignod wrote:



Switching supplies are an example of using higher frequencies so that the
transformer can be much smaller (because it is handling a higher
frequency).

Note that any switching supply converts existing AC to DC, which then
powers a power oscillator that feeds the transformer at a higher
frequency.

But until you explain what you really want, the solution isn't there.

If you're thinking it would be nice to have a smaller transformer in the
power supply, it's already done.

If you hope to get timing off the AC line, but think a higher frequency
makes more sense, then you do the timing from some internal standard
rather than using the AC line for timing.

Michael

Tue Aug 16, 2011 12:52 am   

"Tim Wescott the TROLL "



** My god you are an illiterate fuckhead.




..... Phil

Tue Aug 16, 2011 1:03 am   

eromlignod wrote:

Better:60Hz motor driving a 400 Hz generator, combo to be found
in army surplus trade.

Tue Aug 16, 2011 1:47 am   

Tim Wescott wrote:



Airplanes use(d) 400Hz because the associated equipment is LIGHTER.
Transformer/etc. cores can be made smaller.


mike

Tue Aug 16, 2011 5:41 am   

On Mon, 15 Aug 2011 19:47:18 -0600, m II wrote:


Dangit! I was _thinking_ lighter! Really!

(they're sure as heck not cheaper!).

--
www.wescottdesign.com

Tue Aug 16, 2011 1:14 pm   

On Mon, 15 Aug 2011 08:41:20 -0700 (PDT), eromlignod
<eromlignod_at_aol.com> wrote:


---
Power out?

Sinusoidal output?

--
JF

Tue Aug 16, 2011 4:19 pm   

Tim Wescott schrieb:


Hello,

the weight of the transformers is important for airplanes and this is
much smaller using 400 Hz instead of 50 or 60 Hz. Transformers for the
use in airplanes are not cheap.

Bye

Sat Aug 20, 2011 1:11 am   

eromlignod <eromlignod_at_aol.com> wrote:

simple but not economical would be get an AC power supply from California
Instruments.