Magnetic permeability and magnetic resistance

[kievstar]

hi from ukraine
i'm a electronic engineering student at kiev polytechnic university
i need your helps
how can i calculate this question
The steel winding with the number of coils w= 200 is put on thr ring-like closed
core in regular intervals.The section is rectangular. The external diameter of a ring
D=16 sm, the interval diameter d=10 sm, thickness b=4 sm.Magnetic induction B in
the core have to be equal 1 T1. How will current and magnetic resistance changes,
if the nonmagnetic (air) 'interval b=0.5 mm would be made. Magnetic flux has to be
constant.Define the relative magnetic permeability and magnetic resistance of the
ferromagnetic steel and sheet steel 1512 cores, if the magnetic flux in the interval
(theta)=1.2x1/1000 Wb. Dependence B(H) for steel is approximate to a such data:
0,2(80)0,4(185)0,6(300)0,8(460)1,0(750)1,2(1500)
i find three links http://www.classictesla.com/download/indu_pt_1.pdf
http://www.classictesla.com/download/indu_pt_2.pdf
http://www.technick.net/public/code/...nce_calculator
but i couldn't calculate

 

[Gokul43201]

kievstar, I don't understand the setup. Do you think you can attach a picture?

 

[kievstar]

kievstar, I don't understand the setup. Do you think you can attach a picture?

thanks for your interest i'll attach as soon as possible

 

[kievstar]

i gues one of theese is about with my question
i say guess because tehre is no given picture with questions

 

[berkeman]

Sounds like it's a square cross-section toroidal core, with ID=10cm and OD=16cm, with 300 turns of wire. The question is asking about the change in reluctance when an air gap is introduced. I don't get the part about "Magnetic induction B in the core have to be equal 1 T1." Maybe the attachments will clear that up when they get approved.

 

[kievstar]

thanks so much berkeman
i found a site about the point that you say reluctance change when air gap introduced
http://homepages.which.net/~paul.hills/Solenoids/SolenoidsBody.html"

 

[kievstar]

anyone to help?

 

[berkeman]

anyone to help?

Oh, sorry, from your last post I thought you had it figured out. Please post your work so far, and I'll take a look at it. What part are you having trouble with? What does your textbook say about air gaps?

 

[kievstar]

don't worry i calculated yesterday:rofl:
thank's for your interest