Gerald,
My guess by seriesing two will drop the flux density in each to around 10
kilogauss as each will have 1/2 the line voltage across it. That's well below
the bottom of the knee and in the linear region. It will raise the power
capability X2 also, but I can't say how much without knowing the core
dimensions. Two this way though will run as good or better than a lot of off
the shelf linear transformers because of the low flux density. This means the
efficiency is really high, probably 95% for a rough guess.
Best,
Will
*********** REPLY SEPARATOR ***********
On 3/21/06 at 2:22 PM TexasRF@aol.com wrote:
>Thanks Will and John; I now have an understanding of the heating issues
>with
>the MOT. It appears that these transformers are really a poor choice for
>continuous operation such as a filament power source. Two transformers
>with the
>primary and secondary windings series connected will work and for testing
>the
>traveling wave tubes is the quick method to be used.
>
>Many thanks for your help in my continuing education!
>
>73,
>Gerald K5GW
>
>
>
>In a message dated 3/21/2006 11:10:15 A.M. Central Standard Time,
>craxd1@verizon.net writes:
>
>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
>
>*********** REPLY SEPARATOR ***********
>
>On 3/21/06 at 11:42 AM John Popelish wrote:
>
>>TexasRF@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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>
>
>
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