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#1
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The Transformer
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"? |
#2
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The Transformer
"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 ....... |
#3
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The Transformer
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/ |
#4
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The Transformer
"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. |
#5
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The Transformer
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. |
#6
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The Transformer
"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! |
#7
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The Transformer
"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. |
#8
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The Transformer
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. |
#9
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The Transformer
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 :-) |
#10
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The Transformer
"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. |
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