[TCML] 400 hz variacs

[EVP]

    There must be enough iron for the lowest frequency but the high 
frequency limit is sort of arbitrary and determined by leakage reactance 
and possibly parasitic capacitance.  Whole issue is core saturation and 
for any particular core area and frequency there is a minimum number of 
turns per volt required.  Look up transformer design on Google and you 
should get plenty of discussion.

Ed

HomerLea at aol.com wrote:

>These seem just as heavy as 120v 1.3 amp 60hz ones. What I don't get is how 
>some fixed transformers are rated, for example, at 47hz to 400 hz; not 
>uncommon for military transformers. Guess I should have been an electrical 
>engineer instead of chemist.
>Jim
>
>In a message dated 12/11/2010 8:03:29 PM Pacific Standard Time, 
>ka1bbg at myfairpoint.net writes:
>
>  
>
>>ok to use as inductors, but too little iron for 60 hz operation. brian f.
>>happy holidays
>>----- Original Message ----- 
>>From: <HomerLea at aol.com>
>>To: <tesla at pupman.com>
>>Sent: Saturday, December 11, 2010 4:50 PM
>>Subject: [TCML] 400 hz variacs
>>
>>
>>    
>>
>>>I have a bunch of 208v 1.3 amp and some larger variacs, all 400 hz. Can
>>>these be used as variacs at derated in voltage on 60 hz or are they just 
>>>good
>>>for ballast?
>>>Jim Heagy
>>>
>>>homerlea at aol.com
>>>      
>>>
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>  
>