If one could "ride the electron", what happens deep inside the
transformer such that the inductance of the primary does not
limit the current passing through that primary?

(This lack of understanding always made me feel uneasy when
winding my own potcores for the instrumentation amplifier
I was charged with desiging in my first year after graduating)

This, amongst other things, puzzled me for some time, but
ultimately I reasoned it out. Would anybody like
to partake in a _GENTLEMANLY_ discussion about such technical
matters?

Also, what of a visualisation of the Magnetic Vector Potential, "A"?

"gareth" wrote in message
...
If one could "ride the electron", what happens deep inside the
transformer such that the inductance of the primary does not
limit the current passing through that primary?

(This lack of understanding always made me feel uneasy when
winding my own potcores for the instrumentation amplifier
I was charged with desiging in my first year after graduating)

This, amongst other things, puzzled me for some time, but
ultimately I reasoned it out. Would anybody like
to partake in a _GENTLEMANLY_ discussion about such technical
matters?

Also, what of a visualisation of the Magnetic Vector Potential, "A"?



PASS .......

On Mon, 12 May 2014 13:04:26 +0100, Badluck Jimbo ... wrote:

PASS .......

With honours!



--
M0WYM
Sales @ radiowymsey
http://stores.ebay.co.uk/Sales-At-Radio-Wymsey/

"gareth" wrote in message
...
If one could "ride the electron", what happens deep inside the
transformer such that the inductance of the primary does not
limit the current passing through that primary?

(This lack of understanding always made me feel uneasy when
winding my own potcores for the instrumentation amplifier
I was charged with desiging in my first year after graduating)

This, amongst other things, puzzled me for some time, but
ultimately I reasoned it out. Would anybody like
to partake in a _GENTLEMANLY_ discussion about such technical
matters?

Also, what of a visualisation of the Magnetic Vector Potential, "A"?

Come on then Gareth, we know you are just dying to tell us all the answers.

On Mon, 12 May 2014 12:08:00 +0100, gareth wrote:

If one could "ride the electron", what happens deep inside the
transformer such that the inductance of the primary does not limit the
current passing through that primary?

(This lack of understanding always made me feel uneasy when winding my
own potcores for the instrumentation amplifier I was charged with
desiging in my first year after graduating)

This, amongst other things, puzzled me for some time, but ultimately I
reasoned it out. Would anybody like to partake in a _GENTLEMANLY_
discussion about such technical matters?

Also, what of a visualisation of the Magnetic Vector Potential, "A"?

The inductance of the primary does limit the primary current (except for
losses) as long as the secondary is unloaded. When a load is placed on
the transformer, the current through the secondary generates it's own
magnetic field in opposition to the field from the primary. This
effectively reduces the inductance and allows more current to flow.

There are also other ways to look at it.

--
Jim Mueller

To get my real email address, replace wrongname with dadoheadman.
Then replace nospam with fastmail. Lastly, replace com with us.

"Jim Mueller" wrote in message
eb.com...
On Mon, 12 May 2014 12:08:00 +0100, gareth wrote:

If one could "ride the electron", what happens deep inside the
transformer such that the inductance of the primary does not limit the
current passing through that primary?

(This lack of understanding always made me feel uneasy when winding my
own potcores for the instrumentation amplifier I was charged with
desiging in my first year after graduating)

This, amongst other things, puzzled me for some time, but ultimately I
reasoned it out. Would anybody like to partake in a _GENTLEMANLY_
discussion about such technical matters?

Also, what of a visualisation of the Magnetic Vector Potential, "A"?

The inductance of the primary does limit the primary current (except for
losses) as long as the secondary is unloaded. When a load is placed on
the transformer, the current through the secondary generates it's own
magnetic field in opposition to the field from the primary. This
effectively reduces the inductance and allows more current to flow.

There are also other ways to look at it.

Yup, you've got it!

"gareth" wrote in message
...
"Jim Mueller" wrote in message
eb.com...
On Mon, 12 May 2014 12:08:00 +0100, gareth wrote:

If one could "ride the electron", what happens deep inside the
transformer such that the inductance of the primary does not limit the
current passing through that primary?

(This lack of understanding always made me feel uneasy when winding my
own potcores for the instrumentation amplifier I was charged with
desiging in my first year after graduating)

This, amongst other things, puzzled me for some time, but ultimately I
reasoned it out. Would anybody like to partake in a _GENTLEMANLY_
discussion about such technical matters?

Also, what of a visualisation of the Magnetic Vector Potential, "A"?

The inductance of the primary does limit the primary current (except for
losses) as long as the secondary is unloaded. When a load is placed on
the transformer, the current through the secondary generates it's own
magnetic field in opposition to the field from the primary. This
effectively reduces the inductance and allows more current to flow.

There are also other ways to look at it.

Yup, you've got it!


.... and, of course, when the secondary circuit is saturated, it is then that
the
inductance of the primary comes into play to limit the current. An almost
instantaneous effect but then, unless at RF, we do not consider wave
behaviour in transformers.

On 13/05/2014 10:08, gareth wrote:

... and, of course, when the secondary circuit is saturated, it is then that

It's the core that saturates, not the secondary circuit.

the
inductance of the primary comes into play to limit the

It's the DC resistance that limits the primary current once the core is
saturated, not the inductance.

On 13/05/2014 11:33, Brian Morrison wrote:
On Tue, 13 May 2014 10:39:24 +0100
Kafkaesque wrote:

It's the DC resistance that limits the primary current once the core
is saturated, not the inductance.

When the core is saturated the effective inductance is zero. Think
about the B-H loop diagram for a transformer.

Which is why it's the resistance which limits the current for the parts
of each half-cycle during which the core is saturated.

On the other hand, the resistance will rise (or even O/C) because the
temperature will rise ... possibly quite rapidly :-)

"Brian Morrison" wrote in message
...

It's the DC resistance that limits the primary current once the core
is saturated, not the inductance.

When the core is saturated the effective inductance is zero. Think
about the B-H loop diagram for a transformer.

You misunderstand.

I was referring to the saturation of the current, which is limited by the
secondary load.