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Re: Heating in 4-1/2 turn inductorFrom: Jeff_Johnson@Hotmail.com (Jeff Johnson) "whit3rd" <whit3rd@gmail.com> wrote in message news:69863d94-450f-49b5-bdc0-4428e4f21c20@h19g2000yqb.googlegroups.com... On Aug 27, 10:31 am, "Jeff Johnson" <Jeff_John...@Hotmail.com> wrote: In the ideal case the fringe effects are usually ignored. Atleast every book I've read about inductance supposes the fringe effects can be ignored. Remember, we are talking about the inductive effects on heating those ends and not the inductance itself. That means the 3-d flux inside the core is very different in the In all causes if the the ends are relatively symmetric then both should heat up equally. Also the fringe effects tend to reduce the heat on the ends and not increase it. Also all the effects you describe should heat the central windings more than the outside and have little to do with the end turn amount. Again, In all cases it would be symmetric unless the core or windings themselfs were wound in some weird way. 99.99999% of all inductors are wound to be symmetric. So if there is some effect that is due to the reasons you describe then it must be because they let a 2 year old create the winding. Now, you'll have to excuse me if I make some assumptions about what is going on. When he says inductor I think of basically something that looks like an inductor and acts like one. So if he did something non-standard then he should include that information. I cannot totally exclude some physical reason why such a thing could happen because I don't know all the possibities. Given the assumption that what they created was very much inductor like no one has presented any reason why only one side would heat up and the rest of the coil would be fine that is due to the coil/core. The most likely effect is that the connection on that one end was bad or was shorting out. This is the best guess given the little amount of information that was provided. Since he said the same result was produced independently then this possibly suggests something else but the same mistake could have been made twice. It would be quite easy to create a partially laminated core that was not laminated near one end. The core would heat up due to eddy currents which would heat up the 1/2 turn first. Who the heck would use such a core? Such behavior is to be expected when someone doesn't know what they are doing.
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