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I want to create an inductor with a ferrite core of 2.2 mH, but I do not know the size of the core, the number of turns and the size of the wire. The maximum voltage and current of my work are 429 volts and 2 amps respectively .
Thank you for introducing a document or book on the design of an inductor with a ferrite toroid core. Thanks for helping me.
I want to create an inductor with a ferrite core of 2.2 mH, but I do not know the size of the core, the number of turns and the size of the wire. The maximum voltage and current of my work are 429 volts and 2 amps respectively .
Thank you for introducing a document or book on the design of an inductor with a ferrite toroid core. Thanks for helping me.
On Monday, 1 July 2019 12:31:05 UTC+2, rezaheyd...@gmail.com wrote:
I want to create an inductor with a ferrite core of 2.2 mH, but I do not know the size of the core, the number of turns and the size of the wire. The maximum voltage and current of my work are 429 volts and 2 amps respectively .
Thank you for introducing a document or book on the design of an inductor with a ferrite toroid core. Thanks for helping me.
A standard ferrite will be better since toroid with distributed airgap typically has significantly higher core losses
Cheers
Klaus
One trick to short-cut design is to find a catalog part
that looks like it will work, and basically copy it.
John Larkin wrote...
One trick to short-cut design is to find a catalog part
that looks like it will work, and basically copy it.
Another trick is to find a catalog part that looks like
it will work, and buy it. Find and buy several types.
RevC is hand-wound on a custom mandrel (aka
Sharpie Pen) and air+conduction cooled.
On Mon, 1 Jul 2019 05:51:55 -0700 (PDT), klaus.kragelund@gmail.com
wrote:
On Monday, 1 July 2019 12:31:05 UTC+2, rezaheyd...@gmail.com wrote:
I want to create an inductor with a ferrite core of 2.2 mH, but I do not know the size of the core, the number of turns and the size of the wire. The maximum voltage and current of my work are 429 volts and 2 amps respectively .
Thank you for introducing a document or book on the design of an inductor with a ferrite toroid core. Thanks for helping me.
Unfortunately, magnetics design is complex. The problem is, given the
above, under-defined.
A standard ferrite will be better since toroid with distributed airgap typically has significantly higher core losses
That depends on the magnitude and frequency of the AC excitation,
which isn't stated. The "cool-mu" and equivalent mix toroids are
excellent for some things, like power converters. Not your dad's
powdered iron.
One trick to short-cut design is to find a catalog part that looks
like it will work, and basically copy it. It will at least get you a
starting point.
On 1 Jul 2019 08:11:07 -0700, Winfield Hill <winfieldhill@yahoo.com
wrote:
John Larkin wrote...
One trick to short-cut design is to find a catalog part
that looks like it will work, and basically copy it.
Another trick is to find a catalog part that looks like
it will work, and buy it. Find and buy several types.
I always prefer to buy magnetics instead of building them. An existing
part could get one into the ballpark on size and weight for a custom
design
Here are *three* generations of inductors.
https://www.dropbox.com/s/ml9ay639wdmbwrz/L1A.jpg?raw=1
https://www.dropbox.com/s/wmhkgdg6v52mxxe/L1B.JPG?raw=1
https://www.dropbox.com/s/lmkj7tavf2ou77t/L1C.JPG?raw=1
The first two looked fine according to data sheets, but then I learned
a lot about skin effect. And customer spec-ratcheting.
RevC is hand-wound on a custom mandrel (aka Sharpie Pen) and
air+conduction cooled.
On 1 Jul 2019 08:11:07 -0700, Winfield Hill <winfieldhill@yahoo.com
wrote:
John Larkin wrote...
One trick to short-cut design is to find a catalog part
that looks like it will work, and basically copy it.
Another trick is to find a catalog part that looks like
it will work, and buy it. Find and buy several types.
I always prefer to buy magnetics instead of building them.
Here are *three* generations of inductors.
https://www.dropbox.com/s/ml9ay639wdmbwrz/L1A.jpg?raw=1
https://www.dropbox.com/s/wmhkgdg6v52mxxe/L1B.JPG?raw=1
https://www.dropbox.com/s/lmkj7tavf2ou77t/L1C.JPG?raw=1
The first two looked fine according to data sheets, but then I learned
a lot about skin effect. And customer spec-ratcheting.
RevC is hand-wound on a custom mandrel (aka Sharpie Pen) and
air+conduction cooled.
John Larkin wrote...
RevC is hand-wound on a custom mandrel (aka
Sharpie Pen) and air+conduction cooled.
It looks machine made.
On a sunny day (Mon, 01 Jul 2019 08:47:41 -0700) it happened John Larkin
jjlarkin@highlandtechnology.com> wrote in
aj9khe1b2r75gcddlh0jqg707uvcaig0hk@4ax.com>:
On 1 Jul 2019 08:11:07 -0700, Winfield Hill <winfieldhill@yahoo.com
wrote:
John Larkin wrote...
One trick to short-cut design is to find a catalog part
that looks like it will work, and basically copy it.
Another trick is to find a catalog part that looks like
it will work, and buy it. Find and buy several types.
I always prefer to buy magnetics instead of building them. An existing
part could get one into the ballpark on size and weight for a custom
design
Here are *three* generations of inductors.
https://www.dropbox.com/s/ml9ay639wdmbwrz/L1A.jpg?raw=1
https://www.dropbox.com/s/wmhkgdg6v52mxxe/L1B.JPG?raw=1
https://www.dropbox.com/s/lmkj7tavf2ou77t/L1C.JPG?raw=1
The first two looked fine according to data sheets, but then I learned
a lot about skin effect. And customer spec-ratcheting.
RevC is hand-wound on a custom mandrel (aka Sharpie Pen) and
air+conduction cooled.
That third link looks mechanical feeble
if it gets hot it will unsolder itself,
and if there is a lot of vibration it will unsolder itself too,
maybe even pull the tracks of the board,
is that bare copper end protected by sone stuff?
There is a spec that says the wire should go through the hole etc etc,
but that was mil long ago, maybe it changed
Transformers are easy once you get the hang of it
http://panteltje.com/pub/ultrasonic_antifouling_bigger_transformer_IMG_5179.JPG
http://panteltje.com/pub/home_made_1_to_33_hv_transformer_img_3096.jpg
http://panteltje.com/pub/12V_to_300Vpp_converter_detail_all_there_is_to_it_IMG_6111.JPG
http://panteltje.com/pub/new_transformer_test_setup_img_3153.jpg
I have a box full of various sizes Ecores, and some ring cores...
You can get good ringcores from old PC power supplies.
Al, type of ferrite, L, number of turns.... power, saturation,
OP will have to give a ciruit and more details.
On Mon, 01 Jul 2019 17:03:50 GMT, Jan Panteltje
pNaOnStPeAlMtje@yahoo.com> wrote:
https://www.dropbox.com/s/lmkj7tavf2ou77t/L1C.JPG?raw=1
The first two looked fine according to data sheets, but then I learned
a lot about skin effect. And customer spec-ratcheting.
RevC is hand-wound on a custom mandrel (aka Sharpie Pen) and
air+conduction cooled.
That third link looks mechanical feeble
if it gets hot it will unsolder itself,
and if there is a lot of vibration it will unsolder itself too,
maybe even pull the tracks of the board,
is that bare copper end protected by sone stuff?
The whole idea is to keep it from getting too hot. Heat is bad. Copper
resistance goes up about 0.4% per deg C, which is practically thermal
runaway.
There is a spec that says the wire should go through the hole etc etc,
but that was mil long ago, maybe it changed
Make me.
Transformers are easy once you get the hang of it
http://panteltje.com/pub/ultrasonic_antifouling_bigger_transformer_IMG_5179.JPG
http://panteltje.com/pub/home_made_1_to_33_hv_transformer_img_3096.jpg
http://panteltje.com/pub/12V_to_300Vpp_converter_detail_all_there_is_to_it_IMG_6111.JPG
http://panteltje.com/pub/new_transformer_test_setup_img_3153.jpg
I have a box full of various sizes Ecores, and some ring cores...
You can get good ringcores from old PC power supplies.
Al, type of ferrite, L, number of turns.... power, saturation,
OP will have to give a ciruit and more details.
I considered a cored inductor here but nothing looked like it would
work. I'd burn the paint off a powdered iron toroid.
On a sunny day (Mon, 01 Jul 2019 10:46:40 -0700) it happened John Larkin
jjlarkin@highland_snip_technology.com> wrote in
sfhkhe1f7mgd4sfl9ge7dn32gc1ll8jlo9@4ax.com>:
On Mon, 01 Jul 2019 17:03:50 GMT, Jan Panteltje
pNaOnStPeAlMtje@yahoo.com> wrote:
https://www.dropbox.com/s/lmkj7tavf2ou77t/L1C.JPG?raw=1
The first two looked fine according to data sheets, but then I learned
a lot about skin effect. And customer spec-ratcheting.
RevC is hand-wound on a custom mandrel (aka Sharpie Pen) and
air+conduction cooled.
That third link looks mechanical feeble
if it gets hot it will unsolder itself,
and if there is a lot of vibration it will unsolder itself too,
maybe even pull the tracks of the board,
is that bare copper end protected by sone stuff?
The whole idea is to keep it from getting too hot. Heat is bad. Copper
resistance goes up about 0.4% per deg C, which is practically thermal
runaway.
There is a spec that says the wire should go through the hole etc etc,
but that was mil long ago, maybe it changed
Make me.
Been a long time ago I designed for navy and army,
but they were VERY precise in these things,.,,
Always days of acceptance testing in some lab.
Transformers are easy once you get the hang of it
http://panteltje.com/pub/ultrasonic_antifouling_bigger_transformer_IMG_5179.JPG
http://panteltje.com/pub/home_made_1_to_33_hv_transformer_img_3096.jpg
http://panteltje.com/pub/12V_to_300Vpp_converter_detail_all_there_is_to_it_IMG_6111.JPG
http://panteltje.com/pub/new_transformer_test_setup_img_3153.jpg
I have a box full of various sizes Ecores, and some ring cores...
You can get good ringcores from old PC power supplies.
Al, type of ferrite, L, number of turns.... power, saturation,
OP will have to give a ciruit and more details.
I considered a cored inductor here but nothing looked like it would
work. I'd burn the paint off a powdered iron toroid.
What I wondered is as you talk about skin effect why do you not used silvered wire?
I use silvered wire for all RF coils.
As to coil formers, in the old days for example I used ceramic coil formers
with a thread cut in it where the silvered wire was to sit, so it could not move about.
I mean like this:
http://www.hamtech.hu/coil_body.html
On 1 Jul 2019 09:10:09 -0700, Winfield Hill <winfieldhill@yahoo.com
wrote:
John Larkin wrote...
RevC is hand-wound on a custom mandrel (aka
Sharpie Pen) and air+conduction cooled.
Why was it better?
The first two gens were Coilcraft parts, superficially in spec. Both
got way too hot
I talked to a Coilcraft engineer about this application. His wisdom is
"This power magnetics stuff is hard."
Bill Sloman wrote...
On July 1, 2019, John Larkin wrote:
One trick to short-cut design is to find a catalog part
that looks like it will work, and basically copy it.
John Larkin's favourite strategy. It lets him off doing
any actual design.
It's mine too. I have a huge collection of different
cores, and more important, bobbins, which are harder
to get, many dozens of hours selecting and placing
orders, many thousands of $$ of inventory. I've long
since lost count of how many inductors and transformers
I've designed, and after my technician passed, wound
myself. I love finished custom-magnetic products, but
I hate the process getting there, and will do anything
to get out of it. Buying inventory products is best.
I have a large collection of that stuff, all sizes.
But it often falls short. Especially for HV work.
John Larkin wrote...
... this is a kilovolt, 5 MHz pulse generator. ...
I got my 50-ohm kV pulse-picker to work to 5MHz, but
my goal was 10MHz. Solved that by interleaving two
of them at 5MHz each. Maybe that would work for you.
On Mon, 01 Jul 2019 18:19:19 GMT, Jan Panteltje
pNaOnStPeAlMtje@yahoo.com> wrote:
On a sunny day (Mon, 01 Jul 2019 10:46:40 -0700) it happened John Larkin
jjlarkin@highland_snip_technology.com> wrote in
sfhkhe1f7mgd4sfl9ge7dn32gc1ll8jlo9@4ax.com>:
On Mon, 01 Jul 2019 17:03:50 GMT, Jan Panteltje
pNaOnStPeAlMtje@yahoo.com> wrote:
https://www.dropbox.com/s/lmkj7tavf2ou77t/L1C.JPG?raw=1
The first two looked fine according to data sheets, but then I learned
a lot about skin effect. And customer spec-ratcheting.
RevC is hand-wound on a custom mandrel (aka Sharpie Pen) and
air+conduction cooled.
That third link looks mechanical feeble
if it gets hot it will unsolder itself,
and if there is a lot of vibration it will unsolder itself too,
maybe even pull the tracks of the board,
is that bare copper end protected by sone stuff?
The whole idea is to keep it from getting too hot. Heat is bad. Copper
resistance goes up about 0.4% per deg C, which is practically thermal
runaway.
There is a spec that says the wire should go through the hole etc etc,
but that was mil long ago, maybe it changed
Make me.
Been a long time ago I designed for navy and army,
but they were VERY precise in these things,.,,
Always days of acceptance testing in some lab.
I've designed flight hardware for the Air Force and for NASA, but it's
10% design and 390% compliance nonsense. I don't want to do any more
of that.
It was long lore that solder should never be used as mechanical
support, until Tektronix broke that rule. And now we have surface
mount.
... this is a kilovolt, 5 MHz pulse generator. ...
On July 1, 2019, John Larkin wrote:
One trick to short-cut design is to find a catalog part
that looks like it will work, and basically copy it.
John Larkin's favourite strategy. It lets him off doing
any actual design.