magnetic circuit question

Thread Starter

Vanush

Joined Apr 19, 2008
46
Can someone please help me analyze this magnetic circuit? I've got no idea...!

I want to calculate the flux in each leg.. so, let's take the first leg, flux 1

I know that flux = BA..

I calculate magnetizing force H = NI/l = 500/0.14 = 3571.42

but B = u0 * ur * H = 5000*(4*pi*10^-7)*3571.42 = 22.43

but flux = BA = 22.43 * 0.004 = 0.0089 Wb

Not even close to the answer! (4.887 mWb)
 

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scubasteve_911

Joined Dec 27, 2007
1,203
You should draw the electrical circuit equivalent, so that you may apply the necessary laws. In this case, it would be the current divider rule.

I will not solve the question for you, but I will give you the right steps to do it.

#1) Solve for total core reluctance, this involves finding the area of the core and the length, and using the permeability. You will have a resistor in series with two parallel resistors, hopefully you can find the total resistance. (sorry, thinking electrical)
Rcore = length / u0*ur*area
#2) Solve for total flux
Flux = F/Rcore = N*I/Rcore
#3) Apply the current (or flux) divider equation to solve for the various fluxes along the different paths

Steve
 
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