Effects of gaps in inductors and transformers

[John Larkin]

John Larkin a écrit :

Interesting stuff. Thanks.
And we are less than 1 and 1/2 hour drive away.

It looks like he's in a gorgeous place, near the Swiss border; there's
a map on his web site. I drove around France and Switzerland for six
weeks once, and it was mostly beautiful and wonderful, except for the
cities.

John

 

[Jeroen Belleman]

It looks like he's in a gorgeous place, near the Swiss border; there's
a map on his web site. I drove around France and Switzerland for six
weeks once, and it was mostly beautiful and wonderful, except for the
cities.

It's a gorgeous place, sure enough. Bergoz' place is five minutes
from where I am, just across the border. But many others appear to
think so too and the population density has been growing furiously
lately, with all the nuisance that implies. More traffic, more roads
more houses, more shops, buildings growing everywhere, noise, pollution,
there seems to be no end. Geneva is expanding across the border, in
a way.

I quite liked it 25 years ago, even though the taps fell dry when
the summer was hot.

Jeroen Belleman

 

[MassiveProng]

based on his response, I have to wonder how much of *his* work went into
designing the products to which he refers (and which dont look that hard
either). the phrse "midgets standing on the shoulders of giants" might
be applicable.

Only mental midgets make such asinine remarks.

 

[MassiveProng]

Why do you pretend to know stuff

You're an idiot. Full of stuff, you are.

 

[John Larkin]

Only mental midgets make such asinine remarks.

Why are you at war with almost everyone? Why are you acting like a
junkyard dog? If everyone here is stupid, as you claim, why are you
hanging out here?

Stop the tantrums, show some guts, and shape up.

John

 

[Fred Bartoli]

MassiveProng a écrit :

Only mental midgets make such asinine remarks.

Circular argument?

 

[joseph2k]

Why not quit being a trollfeeder?

Thanks,
Rich

After you, sir.

 

[joseph2k]

**** you. Since it is voltage that causes saturation, you have laid
out an invalid test. So **** off, jack-off.

MissiveWrong bleats again.

 

[joseph2k]

based on his response, I have to wonder how much of *his* work went into
designing the products to which he refers (and which dont look that hard
either). the phrse "midgets standing on the shoulders of giants" might
be applicable.

Cheers
Terry

How about filth clinging to the boots of real Engineers? I seems to be more
accurate with its constant retreats to potty language and lack of
engineering knowledge.

 

[joseph2k]

Your opinion is your opinion, retard. You are beyond help.

You cannot afford my help, failed tech.

 

[joseph2k]

One example is about 4 posts up. I'm sure there are others.

John

Clear enough. Like Robert i had not thought that way.

 

[joseph2k]

Idiots that do not make power supplies always think the world can be
stuffed into a predefined chassis size.

Get a clue, dipshit. They are called design constraints. Of course
the supply had filtration in it. It is the best we could pack in that
size package, and we beat the shit out of the competing product's
specs.

Again, you know nothing about which you spew.

Cursing at me results in my disbelief in you having any ability, and proves
a serious lack of maturity. Save it for some ten-year-old you can impress
that way.

 

[John Larkin]

Cursing at me results in my disbelief in you having any ability, and proves
a serious lack of maturity. Save it for some ten-year-old you can impress
that way.

You're right: he doesn't know anything about magnetics, either.

John

 

[Fred Bartoli]

joseph2k a écrit :

You cannot afford my help, failed tech.

Well, that's very disrespectful

.... for techs

 

[John Larkin]

joseph2k a écrit :


Well, that's very disrespectful

... for techs

A good tech is great, and it's a distinct skill. But some techs, a
minority, get defensive and call engineers "academics" and worse, and
convince themselves that their instincts and/or experience are more
important than an engineer's quantitative knowledge of the items at
hand. Ironically, these types are usually unwilling to actually learn
how things work, and are unwilling to use even simple math to figure
out what's going on, so they reinforce their ignorance. So they are
bad techs.

I wouldn't want to name names here.

We have a couple of great test techs in my company, but no engineering
techs. I think engineers should work on their own designs, for a
number of reasons.

John

 

[John Larkin]

You're an idiot. Full of stuff, you are.

And you snip all my best lines.

John

 

[The Phantom]

A good tech is great, and it's a distinct skill. But some techs, a
minority, get defensive and call engineers "academics" and worse,

I once worked for a company that hired a new guy to be a customer engineer.
I had no idea what degrees he may have had, but his big mouth soon made it
clear that he had a two-year degree and disparaged anybody that had more
than that. I finally told him that I didn't care what degrees he had as
long as he could do the job (I assumed he had the third degree at least).
He actually did a good job and if he had kept his mouth shut about degrees,
I would have assumed more education rather than less.

 

[Genome]

Are these really different? Either way, it's flux that's created by one
coil and not seen by another. Either way, you can think of it as an
uncoupled series inductance. Reciprocity holds.

Jeroen Belleman

Oh, go on then. In for a penny, in for a pound. I'm still not going to be
anywhere near 100% on this though. This will involve hand waving

It's as you state it. Leakage inductance, perhaps I should use the term flux
(?), appears in series with the windings. Which winding it is associated
with, where the energy it carries goes and how it directs the linkage(?)
depends on the geometry and electrical impedances associated with each
winding.

The example the John gives relates to how the flux linkage between windings
is directed according to a shunt which appears in parallel with the flux
through the windings windings. More flux through the shunt less flux linked
through the windings and vice versa.

I'm not going to go as far as saying the arrangement doesn't affect leakage
inductance. OK, I lie, I might try and suggest that the relative ratios of
leakage inductance and mutual inductance remain the same.

You can see I am having problems with the words/concepts but there is
something that isn't 100% right about some of the statements going around at
the moment.

I should really try reading and understanding.....

http://focus.ti.com/lit/ml/slup123/slup123.pdf
http://focus.ti.com/lit/ml/slup105/slup105.pdf
http://focus.ti.com/lit/ml/slup088/slup088.pdf

But I'm sort of lazy.

Of course, to hide my own inadequacies, I get the impression that Mr Prong
is quite old and probably lived through the time where voltage mode control
of push-pull converters caused all sorts of stress and no-one had taken the
knowledge available from elsewhere to explain just what was going wrong.

Gapping the core was a bodge since it increased the magnetising current and
therefore the voltage drop across the driving devices to restore some
semblence of a balance to things. Human nature probably gave rise to many
other perceived advantages. Shout loud enough and.......

DNA

 

[MassiveProng]

You cannot afford my help, failed tech.

Proper transformer gapping when needed is a good thing, dipshit.

Your help is worthless, failed social dipshit.

 

[MassiveProng]

Cursing at me results in my disbelief in you having any ability, and proves
a serious lack of maturity. Save it for some ten-year-old you can impress
that way.

**** you and your beliefs. I don't need to respond to your petty
baby bullshit at all. Nor do I need to measure up to your petty baby
bullshit assessments, dipshit.

So **** off, jack-off.