AC & DC reactors

The equations may be found in any textbook on radio receiver design.

I know there is a finite element calculator "maxwell" of Ansoft that can design reactor electromagnetically. However, if the reactor is high power rated, thermal design should be considered too for the accuracy of electrical parameters. Therefore, high rated reactors can not be downsized much, I think, with the classical design.

One of the reactor construction methods which can be used is helical windings. -Harit

The magnetic material used is the major factor for the size.

If we had a lossless material with extremely high saturation level and permeability, you could shrink these reactors to <1% of the present size.

For the moment, silicon steel is the most cost effective in most applications. And there very little that can be done without adding forced cooling.

If your budget allow it, you can use newer glass metal or iron powder materials with better characteristics and toroidal / pot core shapes. You might cut the weight in half but at a much higher cost.

It all depends on how much you are willing to pay.

Thank you for this valuable information.

I need to know during the last and coming decades how are reactors (coils) designers doing to shrink the reactors sizes for power harmonic filtering applications for adjustable speed drives systems (Medium power).

Many thanks

Hazem

PhD researcher

Most likely by generating less harmonics using active front end drives. This is what happened (is happening) with switching power supplies. We also do it on our line of large power supplies (100KW+).

Most likely, we will combine fast switching frequencies with smaller inductances made of exotic material. When you increase the frequency, you reduce the weight of your magnetics to a point where expensive high performance material become cost effective.

I am designing a passive filter for harmonic mitigation in AC drives application which are common in industry and increasing rapidly. As these filters are usually bulky I have read that new magnetic materials are developed to reduce the size. So I want to know is that true? and how is this trend progressing?

Many thanks

Hazem

Hazem, That is interesting, we have good experience designing LV transformers and chokes. you can contace me on mehtah (at) gmail .c0m -Harit

Mehtah, the email you send is not complete address.

What and where is your job?

Best rgds

Hazem

PhD researcher

Hazem, we design and manufacture transformers and chokes in India. The email is correct, mehtah (at) gmail.com Whats your email? -Harit

Mehtah

I send you an email, did you get it?

Hazem_zubi@hotmail.com

Hazem