WeCo KS-9449 Input

[CJ]

Where's the beef?

Right here. A Western Electric input transformer from about 1928.
This take-apart is gonna cost me about 53,000 yen. However much that is:

Not a bad freq plot:

http://vacuumbrain.com/The_Lab/TA/Western_Electric/WE-KS-9449/we_freq.jpg

I tried to saturate the x-former to get aa B-H plot but there was no way. I would have had to pump about 120 volts ac at 20 hz to do it. As it was, it took 60 volts at 60 hz with no problem.

WE farmed out a lot of work. This tranny might have been built by ACME or some other sub-contractor.

I milled the top off, and then the bottom:

This black goo potting compound had the highest melting point I have ever seen. I burned up my heat gu bearings trying to melt the stuff:

http://vacuumbrain.com/The_Lab/TA/Western_Electric/WE-KS-9449/we_3.jpg

I had to hammer on it as hard as I could after heating it up to get the dang thing out of it's can. Sorry for the out of focus:

http://vacuumbrain.com/The_Lab/TA/Western_Electric/WE-KS-9449/we_5.jpg

Finally:

I had to pry the x-former off the core saddle with a screw driver. It was the only way to get it apart because of the goo. This ripped the leads apart but I was able to snip them before they came out all the way:

http://vacuumbrain.com/The_Lab/TA/Western_Electric/WE-KS-9449/we_7.jpg

This is the core saddle which sits on top of the lead plate. There is another half that sits on top of the coil-core assembly. The two halfs are bolted together with 4 #10 screw. Pretty beefy construction.

http://vacuumbrain.com/The_Lab/TA/Western_Electric/WE-KS-9449/we_8.jpg

http://vacuumbrain.com/The_Lab/TA/Western_Electric/WE-KS-9449/we_9.jpg

This unit was made for the Navy:

http://vacuumbrain.com/The_Lab/TA/Western_Electric/WE-KS-9449/we_10.jpg

This is a gapped EE core that you will have a hard time finding. 0.014 barn roof metal. 1 inch stack. It weighs 1.3 lbs! No wonder I could not saturate this beast! The core is about three inches wide and two inches high. The core is butted together, no lacing, but no gapping material:

http://vacuumbrain.com/The_Lab/TA/Western_Electric/WE-KS-9449/we_14.jpg

Outter wrapper taken off. 0.055 wire outter section.:

http://vacuumbrain.com/The_Lab/TA/Western_Electric/WE-KS-9449/we_15.jpg

http://vacuumbrain.com/The_Lab/TA/Western_Electric/WE-KS-9449/we_16.jpg

Coil geometry is pretty straight forward, 1/2 sec-pri-1/2 sec. Centertaps are brought out. The structure can be seen by looking at the leads:

http://vacuumbrain.com/The_Lab/TA/Western_Electric/WE-KS-9449/we_coil.jpg

There is a pretty good layer of insulation between the pri and sec:

http://vacuumbrain.com/The_Lab/TA/Western_Electric/WE-KS-9449/we_pri-sec-insl.jpg

Kraft paper former, 1 inch tall, 1.03 front width, 1.20 side width, 0.061 thickness:

http://vacuumbrain.com/The_Lab/TA/Western_Electric/WE-KS-9449/former.jpg

Interesting ringing plot at 1 khz square wave un-terminated:

OK, that's it for the pics.

More info:

Turns Ratio: 1.26:1

Pri Inductance: 8.3 Henries DCR 150 ohms 0.0050 wire
Back and forth winding.
Inner pri:10 layers at 87 turns each-last layer is a partial at about 20 turns.
888 turns
Outer Pri:
11 layers at 80 turns to the center-tap
880 turns

Total Pri turns:1768

Sec Inductance: 4.7 Henries
DCR: 93 ohms

Inner Sec: 8 Layers at 87 turn ea.
696 turns
Outer Sec: 8 Layers at 80 turns ea.-Last layer is 71 turns.
711 turns.

Total Sec turns is 1407

I do not know what this x-former was used for. I also wonder why they call it an input transformer, as it is more like a 600A:600 bridging transformer. Would work as a heavy duty input for a Pultec EQP-1A I guess.

OK, that's a wrap. Or un-wrap. Whatever...

cj

 

[gyraf]

Thanks CJ.

Very, very good storytelling.

Jakob E.

ps: Y53.000~US$513 :shock: