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Re: [TCML] laminations



bunnykiller wrote:
Hey Neal,

actually its not simple physics, if it was it would be in the standard hi school textbook :) laminated cores reduce the effect known as eddy currents which become a problem in solid core transformers ( and the only solid core ones Ive seen are for RF usage).

odds are, those cores aren't actually solid. They're probably a ferrite or powdered metal, which is electrically an insulator, so eddy currents can't start.


 As the current flows through the winding, it
creates a magnetic field in the steel ( basically making it a temporary magnet), the thicker the steel, the longer the magnetic field wants to stay. Thus the advent of laminated cores, it still allows a field to be produced to transfer energy to the other windings, but also allows the magnetic field to dissapate faster and be a bit more efficient when the current reverses the direction ( A/C application). Most standard transformer cores operate in the 50 -60 Hz range, if you try using a "standard" core in lets say a 400 Hz enviroment, the transformer core will heat up and loose its ability to transfer the energy properly to the secondary windings... things like inductive heating, saturation of the core and several other anomolies occur.

Scot D



neal@xxxxxxxxxxxxxxxx wrote:

I know I'm probably getting into some basic physics here, but could someone
explain the purpose of multiple laminations in transformers and inductive
ballasts, vs. a solid core of iron/steel? Is a solid core good for any type of
ballast? Thanks,

Neal.



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