# When is a magnetic core considered saturated ? At 50% of core - 100%?

• VinnyCee
In summary, the conversation discusses the concept of saturation in a magnetic core, specifically in relation to inductor simulations. It is mentioned that according to the Metglas datasheet, saturation occurs at a B-field of 0.77 Tesla. However, it is unclear if this field needs to be present in the entire core or just a portion of it. The question also arises if there is a standard for determining when a core is considered truly saturated, particularly in the case of rods.
VinnyCee
When is a magnetic core considered "saturated"? At 50% of core - 100%?

So I am doing some simulations of inductors on the Ansys Maxwell software for electromagnetic simulation. I have a simple inductor with a Metglas core and copper coil. I'm trying to figure out what current is required to bring the core into "saturation" but I'm not sure what constitutes "saturation"!

Metglas datasheet says that the material is in saturation after a B-field of 0.77 Tesla is induced upon it. So what does that mean, that a 0.77 T field must be present in ALL of the core, or just 50% or just in the area covered by the windings?

Here, the middle 50% of the core is over 0.77T:

http://img545.imageshack.us/img545/2393/50percentsaturation.jpg

And here the whole core is over 0.77T:

http://img211.imageshack.us/img211/5006/100percentsaturation.jpg

Is there a standard for determining when a core of a specified material is truly operating as a saturated core?

Last edited by a moderator:

Saturation is measured on toroids, where the induction is uniform over a full circle.

1 person

What about for rods as like above?

## When is a magnetic core considered saturated?

A magnetic core is considered saturated when it can no longer increase its magnetic flux density even with an increase in the applied magnetic field. This means that all the magnetic domains within the core are aligned in the same direction and there is no room for further alignment.

## At what percentage of core saturation does a magnetic core reach 50% saturation?

The percentage of core saturation at which a magnetic core reaches 50% saturation depends on the material and design of the core. Some cores may reach 50% saturation at 70% of the applied magnetic field while others may reach it at 80%. It is important to consult the manufacturer's specifications to determine the exact percentage of core saturation.

## What happens when a magnetic core reaches 100% saturation?

When a magnetic core reaches 100% saturation, it can no longer increase its magnetic flux density even with an increase in the applied magnetic field. This indicates that all the magnetic domains within the core are fully aligned and there is no room for further alignment. It also means that the core is operating at its maximum magnetic flux density.

## Can a magnetic core be over-saturated?

Yes, a magnetic core can be over-saturated. This means that the core is operating at a magnetic flux density above its maximum value. This can lead to several issues, including increased core losses and reduced efficiency of the device.

## How does the saturation level of a magnetic core affect its performance?

The saturation level of a magnetic core greatly affects its performance. When a core is under-saturated, it may not be able to generate enough magnetic flux, resulting in reduced efficiency and performance. On the other hand, over-saturation can lead to increased core losses and reduced efficiency. Therefore, it is important to design and operate a magnetic core within its specified saturation level for optimal performance.

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