[Amps] MW Oven Transformer question

[Will Matney]

If you want to add turns to the primary (if there's enough room, and should be with the secondary removed), you can do a simple test to see how many turns to add. First, use the formulas I published last week about figuring the core size and number of turns to find the correct number of turns for the core size you have. Next, connect the primary to 120 Vac and wind a 10 turn coil secondary. Take that secondary voltage and divide it by the 10 turns. That will be the turns per volt. Last, wind the extra turns you've found you need by the formulas and the known turns per volt. One good thing on this transformer in question, the primary is on the inside. If on the outside, you'd be screwed on removing the secondary.

Best,

Will

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On 3/21/06 at 11:42 AM John Popelish wrote:

>TexasRF at aol.com wrote:
>
>> Not what I hoped to hear but I appreciate the good info! 
>
>If you have a supply of this kind of landfill, you might put two 
>similar units side by side, wire the primaries in series (effectively 
>halving the volts per turn, so eliminating the saturation problems). 
>Then you can knock the shunts out and wind a similar secondary on each 
>(doubling the number of turns to compensate for the half primary 
>voltage) and wire those two secondaries in parallel.  This gives you a 
>reasonably efficient transformer (that won't overheat without a fan) 
>with about a kVA rating.
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