Why does Magnetic Saturation Cause More Losses?

To put it simply, and you must study it to learn more

The area of the hysteresis loop (upto the operating point) is the energy spent (or wasted) in the cycle.

Think also about what is happening in microscopic (or rather at the grain level) and about elastic and plastic changes at the magnetic properties.

When the iron core saturates, the inductance drops, it can even drop to near zero, dependent on how saturated it is, magnetising current increase significantly, causing more I2R loss, the increase hysteresis loss is not the significant portion.

For your 2nd question, the answer is yes, if all other parameters are fixed, the EMF is directly proportional to Area.

Your assertion needs qualification, indeed saturation does not cause excessive HYSTERESIS loss, but when saturation occur, the inductance drops tremendously, therefore causing high I2R loss.

this may help you a little . . .

http://www.richieburnett.co.uk/ballast.html

The concept of magnetic control is where you have a DC winding and two AC windings on a transformer. With zero current you can pass AC into one AC winding and draw AC from the other Ac winding. Voltage ratio will be subject to the turns ratio. With zero DC current, and the AC windings going just to saturation on each cycle, what happens if you pass a DC current sufficient to reach 50% saturation? The transmission of AC drops by 50%, since it is only able to use the available 50% of useable remaining saturation to create a changing field. Go to 100% saturation and AC transmission falls to zero. These were used as motor controls, dimmers etc, before trians etc came on the scene.

Saturable Reactor

I like your link aurizon, it's a good refresher for things long forgotten. DJ

Very simply, in a transformer you are transferring power from the primary to the secondary when you are magnetizing the core. Any increase beyond the saturation point only generates heat.

As you add magnetic field strength (H) by increasing the current (I) through the windings of resistance (R) around a magnetic material core, it results in increasing flux density (B) in the core until it reaches the "knee" where the core becomes magnetically saturated (max. flux density). After that, increasing the current (I) and the inducing field strength (H) can not result in a greater flux density (B) in the core, so the so the field strength emanating from the core or transferred through the core stays relatively constant. The added current (I) in the windings results in lost power (I²R) as heat in the windings (and the core) because no additional magnetic power in the motor or transformer can result.

Unless the core is replaced with material of lower reluctance (greater permeability) the only other way increase efficiency is to increase the cross sectional area of the core.

Have we answered your questions to your desired understanding?

yes Sir!

Thanks a lot!

This is the beauty of CR4 except some people who let one down inspite of correcting the person

The OP had asked about the knee point and the hysteresis.

It may be noted that the I²R loss due to increase in current will be not that significant if one crosses the knee point as the iron losses will be.

It seems that the OP had not seriously taken the advice as given in my post #1 and is rather interested in getting the things spoonfed here. (I will risk the CR4 Admin Censure but tha fact must be stated)

The profile of OP doesn't exist but the quality of questions (this as well as previous) signifies that she (I assume from the lass) is a student. Why don't you ask your professor?

I have hinted sufficiently about area of BH curve infact I won't call it as hint. Did you bother to look how the hyst loop behaves vis a vis different excitations?

What is the Knee point and what happens to the shape of the loop below and what happens after? (BTW Knee point is not directly related to flux it is flux density it is related to)

What does the area of the BH curve signify?

The answers to these questions answer your first questions.

The second question is wrong since none of the machines I know generate 220KV EMF at generator (Transformer yes).

In your electrical machine design course (look at it) there is (at least was 30 years back) something about the dimensions (and hence the weight) Vs Power equation which also features some other design variables. Go through it. And come back with what you understood.

Please note that it is not a single equation that designs a machine. There are multiple equations (and quite a few on mechanical side) that have to be simultaneously satisfied. At your level you may still not bother about mechanical side but at elast pool together the electricals (and magnetic).

A reply to #7, as to why I was reprimanded for being rude.

Well, I did not know, I was, simply. I was wondering openly about the question and the mind capable asking about the whole area of magnetics in a single question. I admit not referring to the properly permissible and preferable expressions by the Marquee of Mayberry rules. But, sirree, me being a simple hungarian engineer, not knowing any better.

In the meantime, I did not abuse the question, but questioning its legitimacy.

Touche'

I happened not to know, nor did I ever met a Marquesse. Her rules concerning boxing may remain a riddle to me for quite some time. But, concerning the Marquee of Mayberry, I must remain firm. That is how I learned it, and you may be privileged to thread the same path.

In the meantime, sirree, I defer absolutely to your superior knowledge of the english mores and habits.

An afterthought: Since I have no idea, where I was impolite, nor did I have in my carcass such an impulse. Nor do you have a single blessed clue. How would you, sirree, have even an inkling, pray tell me?!?

My Dear simple friend

you really should give up while you are ahead, and as English is not your first language you should not try to impress others by using a language and words you don't understand, rather you should listen and learn.

So pay attention and learn...

No-one who is living has met the Marquess of Queensberry, as HE died many decades ago

Your reference to the "Marquee of Mayberry" has me baffled, so it must have you confused beyond belief.

So as an native English speaker, it must be my duty to help you and correct you. So with that said, please pay attention to the following.

There has never been a Marquee of Mayberry, Male or Female, and the word you use "Marquee" is as follows (from wikipedia)

Marquee may refer to:

A large tent, open-sided and installed outdoors for temporary functions....... "Marquee", a song by Superchunk from their 1997 album Indoor Living...... Marquee Cinemas, a movie theater chain in the United States.... The Marquee Club, commonly called The Marquee, a rock club in London....... Marquee used in American English to mean a sign above a stage or movie theater or a sign that displays messages such as those used in front of churches and schools..... Marquee player, in the Australian soccer A-League whose salary is exempt from capping...... Marquee element, an HTML tag that makes text scroll across the page as if on a marquee....... Marching ants, also known as marquee selection, a common GUI element for selecting items within an area...... The Marquee Theatre, a concert venue in Tempe, Arizona, US

So now you know what a tent is....

As for Mayberry..

Mayberry

From Wikipedia, the free encyclopedia

This article is about the fictional setting for The Andy Griffith Show. For other uses, see Mayberry (disambiguation). Mayberry is a fictional community in North Carolina that was the setting for two American television sitcoms, The Andy Griffith Show and Mayberry R.F.D. Mayberry was also the setting for a 1986 reunion television movie titled Return to Mayberry. It is said to be based on Andy Griffith's hometown, Mount Airy, North Carolina.

So my job is done, you are now educated that little bit more.

Your question about the legitimacy of the question is more illegitimate. There is actually quite a simple explanation, as my earlier post.

Who are you to question the legitimacy of a question.... if you don't like the question DON'T answer.

Simple!

Even you should understand that part, by your own admission!

The magnetic saturation occurs when the core carry the magnetic flux above its rated capacity.The magnetic saturation is undesirable because

1. It distorts the voltage

2. The Eddy current loss increases

3. The hysteresis loss increases

Read More:https://sdvelectrical.blogspot.com/2018/09/magnetization-curve-of-current.html