RE: Higher Mains Frequency

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "WIZZARD . by way of Terry Fritz <teslalist-at-qwest-dot-net>" <pbobyk-at-hotmail-dot-com>

I believe aircraft use 400 Hz distribution systems so the transformers can 
be lighter.


>From: "Tesla list" <tesla-at-pupman-dot-com>
>To: tesla-at-pupman-dot-com
>Subject: RE: Higher Mains Frequency
>Date: Wed, 18 Jun 2003 13:14:40 -0600
>Original poster: "Black Moon by way of Terry Fritz <teslalist-at-qwest-dot-net>" 
><black_moons-at-hotmail-dot-com>
>
>Well, you don't need inverters for one.
>2nd, your 60hz transformers will probley still work on it, and all smps 
>would, mabey with poor power factor but a simple modification could help 
>fix that.
>3rd, less idle current for transformers, smaller transformers for the same 
>power.
>
>
>
>
>> >The concept indeed looks interesting, but why change an already perfectly
>> >working system!!!  60Hz is more than readily available - why add the
>> >complexities of a multi-kilowatt inverter system.
>>
>>Because it's fun darnit! And educational too. People probably said the same
>>about the SSTC when it was first invented.
>>
>>Anyway, personally I have two thoughts on this.
>>
>>1) By driving a transformer at a higher frequency you can get more voltage
>>before it saturates. Ferinstance an MOT at 400Hz could give 12kV and (more
>>importantly) one of those little 12v:240V transformers would give 1600V.
>>Also they have chambered plastic bobbins that give good primary/secondary
>>isolation.
>>
>>One could imagine an 'MMT' made of about a dozen of these little
>>transformers in series, maybe in oil, with the 12V primaries all in parallel
>>driven off a half-bridge inverter that runs off the rectified 120V line. An
>>HVDC supply would be equally easy to make by just putting a small bridge
>>rectifier and cap on each transformer and stacking them in series.
>>
>>2) You can get 115V 400Hz three-phase generators cheap from military
>>surplus. They come in ridiculous powers all the way up to 60kW gas turbine
>>powered units. Imagine a 12-MOT bank running off one of those.
>>
>>Steve C.
>