winding yer own transformers, somewhat OT.

[Rowena Larkins]

> clips..nifty... I thought I would treat myself instead of going through all the bs
> of riveting a bunch of sheet steel Es and Is together to make my own cores.
> 
> Ok, now, the only problem is that the spindle (the middle part of the E) where you
> wrap your wire is about twice as long as the one in the plans. Obviously, this
> will make me be able to get more turns per layer..
> 
> Now, I know the number of turns is critical to the tranformers behavior, but, is
> the number of layers critical also?
> Anyone have any answers? Maybe some of you power supply ppl?


Ok. My transformer experience was that I worked in a transformer factory while
studying for my degree.

All things about a transformer influence it's behaviour.

In the factory we added or removed steel cores to alter the voltage to 
specifications. We tapped them with a small hammer to adjust the voltage. 

The type of core influences the magnetic flux linkage, as does the thickness and
type of core. In fact the core has voltages induced in it which can effect the 
voltage positively or negatively in the secondary. 

In the factory there was a design team which did the main design of the
transformer elements. A bunch of labourers wound coils using a winding machine.
(these were mostly women by the way ) 
the coils were voltage tested for shorts and open circuit. The shunts were then 
put in. They were adjusted to give the right voltage. 

Some were then dunked in pitch  (stinkies).

Then terminals were soldered on.

Quality control took samples regularly.

It was some years ago, but It was a fairly straigtforward process. 
Though all items in the transformer need to be taken into consideration.


Rowena