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Re: Heating in 4-1/2 turn inductorFrom: tmoranwms@charter.net (Tim Williams) news:i57kn8$rfs$1@news.eternal-september.org... <big sexual act snip> The reason is that the current through the wire will almost be surely Well, no: the current density varies strongly, especially if the wire is thick (curiously, it was never stated what size wire is in question, nor what type; 600kHz suggests fine stranded litz!). Wire near the gap (which is usually placed in the center, right underneath the winding) experiences fringing fields, which dramatically increases losses. That precisely means that the heat generated per unit length will be the Eddy currents in the center of the coil are much stronger than at the ends, so the center of a solenoid heats up much more strongly. The uncooled coil in this video demonstrates proximity effect: See the connections are clean and coppery, but the coil has seen better days. You can't really tell if the center turns are hotter; they probably are by a little bit. Of course Kirchoff is harder to fool, obviously the total current flowing along the wire is the current flowing along the wire period. Unless there's a short, which supposedly was inspected as to have none. None of these are an "end" effect. The only possible explanation is a short, or else, "look harder". It's plainly obvious that the cause is NOT "an additional half turn". It is only a coincidence that this symptom showed up between turns 4 and 5. Tim -- Deep Friar: a very philosophical monk. Website:
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