"Stoatgobbler" wrote in message
...
Shaun wrote:
"Stoatgobbler" wrote in message
...
Hi there,

Does anyone know if there is a reason why I cannot mount toroidal
transformers one on top of another (stacking them) with a single metal
mounting bolt going through both? I can't see anything on the web which
suggests I don't do this.

Stoat

The magnetic flux from one transformer could interact with the other one
being that they are that close to eachother. I've seen cases where cases
where the toroidal transformer was made up of two or more rings stacked
one on top of the other, and then the wire wrapped around them all.

I used to repair industrial electronics and I've never seen someone stack
toroidal transformers before. They mount them side by side with
clearance.

Shaun

Well, I've mounted them on top of one another, I can't find any problem
with it.....however....I've got I've used these toroids to create two
split rail power supplies (two independent +22v - 0 - -22v supplies) and
to make them independant I've "lifted" the 0v commons from the chassis
earth via 60ohm resistors. The greater the current I pull out of the power
supply the greater the potential difference across the 60ohm resistor.
when I pull 1.1A from the power supply then I have nearly 17v across the
60ohm resistor. This voltage does not seem to vary with raising the upper
toroidal away from the lower so I don't think its to do with this.

I've never "played" with this, I did expect a voltage across it (due to
eddy currents within the transformer?) but I thought it would be
nominal....0.25A is not nominal.

Is this normal?

I don't have an answer for you about that.

Shaun