Order of transformer windings?

[Les Moore]

Generally speaking, are _split windings_ in commerical transformers
wound one complete winding on top of the other, ie. from a single wire
feed, or are the windings wound simultaneously from a multi-wire feed?

Thanks for any insight.

Les

 

[Adrian Jansen]

Les Moore wrote:

Generally speaking, are _split windings_ in commerical transformers
wound one complete winding on top of the other, ie. from a single wire
feed, or are the windings wound simultaneously from a multi-wire feed?

Thanks for any insight.

Les
Did you take one apart and look ?

Did you think about the most common use of a transformer - which is to
change a voltage from one level to another - eg 110 volts in to 12 volts
out ? To do this , you have to have a primary with one number of turns,
and a secondary with a different number, in the ratio ( roughly ) of the
voltages. So how would you do this with a common multi-wire feed ?


--
Regards,

Adrian Jansen adrianjansen at internode dot on dot net
Design Engineer J & K Micro Systems
Microcomputer solutions for industrial control
Note reply address is invalid, convert address above to machine form.

 

[Rich Grise]

On Sat, 19 Feb 2005 11:15:36 +1000, Adrian Jansen wrote:

Les Moore wrote:
Generally speaking, are _split windings_ in commerical transformers
wound one complete winding on top of the other, ie. from a single wire
feed, or are the windings wound simultaneously from a multi-wire feed?

Thanks for any insight.

Les
Did you take one apart and look ?

Did you think about the most common use of a transformer - which is to
change a voltage from one level to another - eg 110 volts in to 12 volts
out ? To do this , you have to have a primary with one number of turns,
and a secondary with a different number, in the ratio ( roughly ) of the
voltages. So how would you do this with a common multi-wire feed ?

Two each 120V primaries. Are they one on top of the other, pie wound side
by side, or wound bifilar? Bifilar is the most logical - that gives the
least loss when connected for 120V mains, and is pretty much irrelevant
when wired for 220.

But, yes, the only way to know for sure is to either take one apart or
ask the folks who made it. ;-)

Cheers!
Rich

 

[Pooh Bear]

Les Moore wrote:

Generally speaking, are _split windings_ in commerical transformers
wound one complete winding on top of the other, ie. from a single wire
feed, or are the windings wound simultaneously from a multi-wire feed?

Can't wind simultaneously or you'll never meet regulatory safety specs.
Creepage / clearance distances etc...

Ohhhh - unless you use triple insulated wire maybe. But that's kind
'niche'.

Splitting windings into multiple layers is good for efficiency in HF SMPS
designs.


Graham

 

[Dennis Mchenney]

Both ways, dependings on application, and a couple of other ways too.
See *bifilar* *winding too.*

Les Moore wrote:

Generally speaking, are _split windings_ in commerical transformers
wound one complete winding on top of the other, ie. from a single wire
feed, or are the windings wound simultaneously from a multi-wire feed?

Thanks for any insight.

Les

 

[John Woodgate]

I read in sci.electronics.design that Rich Grise <richgrise@example.net>
wrote (in <pan.2005.02.19.02.43.33.502506@example.net&gt about 'Order of
transformer windings?', on Sat, 19 Feb 2005:

Two each 120V primaries. Are they one on top of the other, pie wound
side by side, or wound bifilar? Bifilar is the most logical - that gives
the least loss when connected for 120V mains, and is pretty much
irrelevant when wired for 220.

You get adjacent turns with 170 V peak between them. Better make sure
the insulation is up to the job!
--
Regards, John Woodgate, OOO - Own Opinions Only.
The good news is that nothing is compulsory.
The bad news is that everything is prohibited.
http://www.jmwa.demon.co.uk Also see http://www.isce.org.uk