[TCML] laminations

[Paul Bidmead]

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). 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.
not entirely true
a 50hz transformer can be used at 400hz but not vise versa
the losses infolved in this instance are due to the amount of on time - 
longer its on the more magnetic flux built up therefore approching 
saturation
if its reversed quicker it doesnt have a chance to build up as far -- 
having said that it will still be slightly less efficient for high power 
applications due to reduced coupling

> Scot D
>
>
>
> neal at imagesbyneal.com 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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