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I have winding instructions for winding a EE13-06 ferrite core transformer, for secondary it's written 0.23 mm TIW,

no. of wire = 1,

no. of turns = 66,

start = float short,

finish = float long.

What does float long and float short mean? What is their utility?

winny
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Yogita Adhikari
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  • Does it have a bobbin with pins or flying leads? – winny May 03 '23 at 06:33
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    It sounds like you leave a flying lead, rather than terminate it to a pin on a bobbin, but that's a guess as I've not heard the term before. Leaving them long and short will help distinguish the start and finish. Unimportant for a single winding, but if you have several windings you will probably need them to have the right polarity with respect to each other. – Neil_UK May 03 '23 at 08:23
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    Please provide a link to the original document. – datenheim May 03 '23 at 08:24

1 Answers1

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Tried to explain with my horrible drawing skills:

enter image description here

Red here is the floating short (start) and blue is the floating long (finish), and arrows represent the winding directions of each layer.

0.23mm TIW has probably a final diameter of 0.38-0.4mm. Assuming you have a standard EE13 bobbin with a window breadth of 8.7mm, one layer of winding will take 8.7/0.4=22 turns. So you'll probably wind 3 layers. This means that you'll start at one end and finish at the other end (Even if one layer takes slightly higher than 22 turns you'll finish winding at quite close to the other end of the window). That's why the floating (or flying) wires will be short at start and long at finish.

Rohat Kılıç
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