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'[EE:] inductor 9 mH 15A'
2004\07\16@043618 by Wouter van Ooijen

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A customer send me on a hunt for a 9 mH 15A indictor. Is this something
I can expect to find at normal electronics shops, is 'indictor' the
right search term? It is intended so suppress the junk created by a
chopper motor driver.

Wouter van Ooijen

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2004\07\16@051842 by hael Rigby-Jones

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>-----Original Message-----
>From: Wouter van Ooijen [spam_OUTwouterTakeThisOuTspamVOTI.NL]
>Sent: 16 July 2004 09:34
>To: .....PICLISTKILLspamspam@spam@MITVMA.MIT.EDU
>Subject: [EE:] inductor 9 mH 15A
>
>
>A customer send me on a hunt for a 9 mH 15A indictor. Is this
>something I can expect to find at normal electronics shops, is
>'indictor' the right search term? It is intended so suppress
>the junk created by a chopper motor driver.
>
>Wouter van Ooijen

"inductor" is the correct serach term, but a 9mH 15A inductor will be a very
large component.  Not something a normal electronics shop is likely to
stock, and will probably be difficult to source even from the larger
distributors.  Are you sure he didn't mean 9uH?

Regards

Mike


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2004\07\16@052221 by Wouter van Ooijen

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> "inductor" is the correct serach term, but a 9mH 15A inductor
> will be a very
> large component.  Not something a normal electronics shop is likely to
> stock, and will probably be difficult to source even from the larger
> distributors.  Are you sure he didn't mean 9uH?

No, sure about it. He found some, but 2 month delivery time. He expects
something like 8 x 8 x 8 cm ( 3 x 3 x 3 inch). So far I did find some
15A stuff at DigiKey, but not 9 mH.

Wouter van Ooijen

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2004\07\16@074219 by Mauricio D. Jancic

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Hi Wouter,
       It something I would go and buy directly to my transformer company.
I guess I can contact you with them as I assume they can do such component
(not taking so long as 2 months) but I guess it wouldn't work for you since
I'm in Argentina... anyway take a look at the local transformers
manufacturers...

Regards

Mauricio D. Jancic
Janso Desarrollos - Microchip Consultant
(54) 011 - 4542 - 3519
Lugones 3238 "B" - C1430ECN
http://www.janso.com.ar
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MSN: .....jansodesarrollosKILLspamspam.....hotmail.com
> {Original Message removed}

2004\07\16@081126 by Martin Klingensmith

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Wouter van Ooijen wrote:
> A customer send me on a hunt for a 9 mH 15A indictor. Is this something
> I can expect to find at normal electronics shops, is 'indictor' the
> right search term? It is intended so suppress the junk created by a
> chopper motor driver.
>
> Wouter van Ooijen

Is it possible to raise the switching frequency? That's huge!

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2004\07\16@081751 by Wouter van Ooijen

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> Is it possible to raise the switching frequency? That's huge!

I am not involved in the design, just in the hunt. As far as I
understood the inductor is to smooth the current into the capacitor
before the switcher itself. This current is itself switched. Not
chopped, just switched on/off at certain moments of the sine.

Wouter van Ooijen

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2004\07\16@082620 by Thomas Sefranek

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I have a 5mHy at 30 amps for 60 Hertz and it weighs about 35 POUNDS!

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> {Original Message removed}

2004\07\16@103052 by Spehro Pefhany

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At 10:33 AM 7/16/2004 +0200, you wrote:
>A customer send me on a hunt for a 9 mH 15A indictor. Is this something
>I can expect to find at normal electronics shops, is 'indictor' the
>right search term? It is intended so suppress the junk created by a
>chopper motor driver.
>
>Wouter van Ooijen

"Filter reactor" is another term, at least in English.

In North America Hammond makes a standard 10mH 20A device that weighs
about 17lb (~7kg).  P/N 195J20

Cost is about US$80.00 for one piece.

Best regards,

Spehro Pefhany --"it's the network..."            "The Journey is the reward"
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2004\07\16@104508 by Jake Anderson

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choke perhaps?
not radio of course lol
welders seem to have simmilar things in them (at least dimensionally)


> {Original Message removed}

2004\07\16@114251 by Martin Klingensmith

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Wouter van Ooijen wrote:
> A customer send me on a hunt for a 9 mH 15A indictor. Is this something
> I can expect to find at normal electronics shops, is 'indictor' the
> right search term? It is intended so suppress the junk created by a
> chopper motor driver.
>
> Wouter van Ooijen

I have a bare micrometals core about 6" diameter, but shipping to you
would be a lot. You'd also have to wind it yourself.


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2004\07\16@233829 by Dwayne Reid

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Wouter van Ooijen wrote:
>A customer send me on a hunt for a 9 mH 15A indictor. Is this something
>I can expect to find at normal electronics shops, is 'indictor' the
>right search term? It is intended so suppress the junk created by a
>chopper motor driver.

Have a look at the filter chokes used for phase control tungsten lamp
dimming.  One such source is Amecon.

dwayne

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2004\07\17@034424 by Peter L. Peres

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Try 10mH 15A and it's inductor and no, it is not something you can buy
easily. He also needs to specify if the 15A is AC or DC. If there is DC
through it then special rules apply. From your description it seems there
is. It would also be useful to know at what frequency it needs to be 10mH.
That would allow you to choose by core type.

Peter

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2004\07\17@034426 by Peter L. Peres

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>I have a 5mHy at 30 amps for 60 Hertz and it weighs about 35 POUNDS!

Are you sure it's not 5H ? The primary winding ot mains transformers is
often of that order of magnitude. F.ex. microwave oven transformer primary
is 2 to 6 Henrys (several types). That would be a 8 Amp 2 Henry choke for
you, not rated for DC. (the primary is rated 120Vac 1kW). The dc can be
compensated by feeding a controlled dc through the secondary.

Then there is the dc resistance which will cause several volts of drop at
15A and it will run hot.

Peter

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2004\07\23@162125 by dr. Imre Bartfai

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Hi,

maybe I'm wrong but also a term "choke" maybe of interest. I would look
around the homepages of VFD manufacturers, which actually have both RF
chokes and dU/dt ones. I just tested e. g. http://www.mitsubishi.de and found
Funkentsörfilter bzw. Zwischenkreisdrossel further Drehstrom-Netdrossel
which could help you.

Regards,
Imre

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On Fri, 16 Jul 2004, Wouter van Ooijen wrote:

{Quote hidden}

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2004\07\23@200131 by William Chops Westfield

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On Jul 23, 2004, at 1:37 PM, dr. Imre Bartfai wrote:

> maybe I'm wrong but also a term "choke" maybe of interest.

Yeah, the size you're talking about (assuming that's really
millihenries) might be considered to be in the range used in audio
crossover networks for high power speakers.  Some of the surplus
dealers have/had things in the 5mH/5A range for about $5, labled as
crossover chokes, for instance.  I'll bet some of those 800W subwoofers
aimed at
car-shaking would have inductors in the range you're talking about.

Nowdays, with cheap semiconductors, I think most high power equipment
does the crossover in the low power arena, and then uses separate amps
for each speaker, so these are rarer than they used to be.

BillW

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2004\07\23@210015 by Martin Klingensmith

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William Chops Westfield wrote:

>
> Nowdays, with cheap semiconductors, I think most high power equipment
> does the crossover in the low power arena, and then uses separate amps
> for each speaker, so these are rarer than they used to be.


Correct, I have never seen an inductor this big in an audio application.
It would be huge!
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