How hysteresis loss increases with frequency?

[Bronzeado]

Hi folks,

Everybody knows that hysteresis loss increases when frequency also increases.
This phenomenon is normally shown as an enlargement of the hysteresis area.

Is it true? I mean, will the histeresis become really "fat"?

Best regards,

H, Bronzeado

 

[MagMike]

It looks like you answered your own question.

 

[dgallup]

This was posted previously, it should answer your questions:

http://www.arnoldmagnetics.com/mtc/pdf/SMMA_Fall_Constantinides_081017.pdf

 

[Bronzeado]

dgallup,

Thank you for providing the link.

My doubt is:

physically, if the frequency increases, will the hysteresis area really "increase" or is this "increassing" only an "equivalent area" to represent the loss?

I am not a "magnetic man". My guess is that the hysteresis area is a characteristic of the material and the losses increase due to the increasing of the magnetic domains motions.

In other words, if the frequency doubles, the domains will duplicate their motions, with the hysteresis being "performed" twice. In this case the losses may be "equivalent" to a hysteresis with twice the area.

If the hysteresis bacomes really "fat" then the material characteristics will change, I think.

Regards,

H. Bronzeado

 

[MagMike]

There are no physical changes to the material when the frequency changes. The coercivity increases because it takes time for the domains to flip, there is no duplicate motion involved.

It is the increased coercivity that makes the hysteresis loop look "fat".

 

[EdStainless]

think of it this way. the magnetic properties are a function of frequency like the strength is a function of temperature. You measure under different conditions and you get different results. The internal magnetization field reversal that you are measuring is a physical process. There are forces and times involved. Making this happen at different speeds (frequency) will result in different properties.

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