saturation Current of Toroidal Inductor

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M.Rehan

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saturation Current of Inductor

I have black toroidal inductor cores
According to manufacture data its saturation current is 3A Idc

If I use two cores for one inductor will its saturation current increase? If used copper wire can handle 7A

 

Saturation field strength H is an ampere turns (N*I) quantity. Using two cores with the same number of turns doesn't change it.

The photo seems to show a common mode choke (with 4 terminals). It's usually not specified with a saturation current.
 
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    M.Rehan

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Re: saturation Current of Inductor

M.Rehan said:
If I use two cores for one inductor will its saturation current increase?
Click to expand...

What arrangement you want to do?
To wind around these two cores stacked side-by-side?

This would in fact reduce the electromagnetic flux over each core, but it seems a bit unusual?
 

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andre_teprom said:
To wind around these two cores stacked side-by-side?
Click to expand...

Yes

Actually I want to increase the saturation current point of my inductor.
Increasing Number of turns will increase Inductance but not the saturation point.
Is there any way to increase saturation current of inductor with changing parameters like frequency turns etc?
 
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Just to prevent mislead, saying saturation current it induces the wrong idea of being on electric current, but what you certainly want to know if on changing turns/frequency would lead magnetic flux beyond core saturation limit ? Yes.
 

Is there any way to increase saturation current of inductor
Click to expand...
Sure, reduce number of turns. Or increase the air gap, not available for toroid core of course.
 
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    M.Rehan

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CMRR of the choke depends on ratio of impedance for conducted emissions or Xc/XL although normal used in a pi filter.

So you can almost double the Imax with half the turns then restore the reactance with doubling the core size if you need a certain attenuation of COmmon Mode or differential mode noise by using commin mode caps and differential mode cap. ok?
 

@FvM

Refering to Thread #5
https://www.edaboard.com/threads/199057/

I have actually increased core size using 2 cores attached side by side with glue and then wrap wire around it.

If core size increased will it increase its saturation current of inductor?


In thread #5 of above given link it says Yes

But in your reply says No.

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FvM said:
The photo seems to show a common mode choke (with 4 terminals). It's usually not specified with a saturation current.
Click to expand...
I used photo from internet to show two core attached side by side.
In my case its a single wire coil.
 

In thread #5 of above given link it says Yes
Click to expand...
Which statement are you particularly referring to?

Suggest to review basic physical law instead of construing previous threads.

Saturation current of an ungapped inductor core is determined by saturation field strength Hsat of the core material. It has a unit of A/m, which means in this case ampere turns divided by effective magnetical path length. Core cross section doesn't occur in the equation,
 
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    M.Rehan

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I don't have much knowledge of saturation of core
I have another inductor.
Specs are
Core Colour is Black
Outer Dia = 74mm Inner Dia = 38 Height = 13mm
100 turn of wire makes it 14.84 mH Inductor.
What will be its saturation current (Estimation of saturation of core by its size and previous experience)

I don't know its manufacturer either

Same as mention on Ebay But Black Coloured
**broken link removed**
 

Let say Core has least saturation points in the family of Powdered Iron cores

Guess How much saturation current it may have with 100 turns and with 20 turns
 

M.Rehan said:
Let say Core has least saturation points in the family of Powdered Iron cores

Guess How much saturation current it may have with 100 turns and with 20 turns
Click to expand...
aren't you an engineer? can't you measure resonance with a known C and 1 turn to compute L then increase current until L drops 10% ( saturation)

permeability can vary 10:1 and look the same ...easily

if not then request specs.

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if Al =600 wire thru hole will be 1.2uH
20 turns will be be good for N x the above . LOok up Bmax , compute cross sction area, calc max I

Dont need much more than this
 
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The problem is, we do not know what the material is.
And if we cannot find out, there is no way of knowing for sure what Bmax is.

Its pretty strange stuff whatever it is....
Al works out to 1,484nH for one turn.

Looking through some data books on similar sized toroids, the lowest permiability ferrite core I could find was way over 1,484nH, more than double.

All grades of powdered iron were way down below 1,484nH for similar sized toroids, less than a tenth.
It cannot be permalloy either.

As its black and unpainted, its most probably an ultra low permiability ferrite intended for a high power RF transformer applications would be my guess.

If that is so, Bmax would probably be 300mT and that makes it far from ideal to use as a dc choke.
If that is what it is, it would be much more appropriate as a tuned circuit or transformer with high frequency ac voltage and no dc.
 
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    M.Rehan

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You can get iron oxide core from B = 30 to 3000. 30 is for microwave, 3000 for low,f.

I estimate his Permeability is 600

This part on Ebay is likely scrap or rejcts selling at 10% normal,high quality prices.

If orignal specs are 3A then two parallel cores with half the wire length may be good for 6A, with heavier guage lower by parallel wiring to reduce conduction losses and increase L/R

ok?
 
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    M.Rehan

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I don't have high current power supply (Just 3A max) So I can not test it

Yes You guys are right.

I got it from an old solar charge controller kit (looked about 1-2 kW) winded in chocked configuration

SunnySkyguy said:
I estimate his Permeability is 600
Click to expand...
Then What will be saturation current for 100 Turn and for 20 Turns?

saturation and permeability don't have linear relationship then what will be the formula for saturation calculation from permiablity?

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Warpspeed said:
Looking through some data books on similar sized toroids
Click to expand...
Can you Please share data books link
 
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