Transformer; How do I calculate turns and volume.

[Zoxks]

Hey guys.

So I know how transformers reduce or amplify voltage the same ratio of the primary and secondary windings, but how do you find how many windings to create? I mean if I want to step down a ratio of 10-1, I could either have 10 windings in the primary, and 1 in the secondary, or I could have 10000 windings in the primary, 1000 in the secondary. How do I know which to choose?

Also, how do I know how big to make the core? Is is somehow related to current?
Thanks!

 

[Bluejets]

This will give you some idea.......

https://en.wikibooks.org/wiki/Electronics/Transformer_Design

 

[Colin Mitchell]

To save wading through a mass of information, the first thing we want to know is the wattage of the transformer.

 

[Zoxks]

Roughly 144 watts. But to be honest, I'm not really making a transformer. I'm making a magnetic amplifier. I was hoping on getting some insight on the subject so I could calculate how many winding to use, since mag amps and transformers are closely related.

 

[Colin Mitchell]

You just said you want two windings. That is a transformer.
What frequency do you want?

 

[davenn]

Roughly 144 watts. But to be honest, I'm not really making a transformer. I'm making a magnetic amplifier. I was hoping on getting some insight on the subject so I could calculate how many winding to use, since mag amps and transformers are closely related.

please show us the circuit you are wanting to build

 

[ramussons]

AFAIK, Magnetic Amplifiers will need a special core material. Normal transformer cores are not suitable.

 

[Zoxks]

You guys are great. I had a heck of a time at the other forum.

So here is the circuit I am trying to build. The ratios between the coils still matter, but I don't know how many windings to use. I suppose that it can be calculated, but I don't know how.
If it helps, I'm trying to use 10 volts DC on the control circuit, and 24 volts AC on the load circuit. (I think 144 watts is a bit off)

Is there also a way to calculate core volume?

 

[Zoxks]

Wiki article: https://en.wikipedia.org/wiki/Magnetic_amplifier

 

[Sanu]

A ratio for transformer turns is the division by TR = Np / Ns of the number of turns of the primary winding in the secondary winding. This ratio should also equal the primary winding voltage divided by the secondary winding voltage, as indicated by Vp / Vs

 

[Harald Kapp]

@Sanu Do you realize that this is an old tread from 2016?

 

[Sanu]

@Sanu Do you realize that this is an old tread from 2016?

Yeah I know just though to help