
#1
Mar1612, 05:33 AM

P: 53

Hi,
we have been doing lots of work recently on magnets. we have learnt about the ideas of flux, and using them to describe induction and how transformers work etc. i feel that i understand quite well about these ideas, but now i have come across this idea of 'flux linkage'. i do not understand what this is. the definitions i have been reading don't seem very explicit. so please can somebody explain to me what it is, and why the ideas are important/useful. thanks in advance. 



#2
Mar1612, 09:09 AM

Sci Advisor
HW Helper
Thanks
P: 26,167

hi lntz!
a major difficulty in understanding magnetic flux linkage is that it has the same units as magnetic flux (Wb) if there are N turns of wire round an area A, through which there is a magnetic field B at an angle θ, then the magnetic flux through A is Φ = BAcosθ, and the magnetic flux linkage through A is NΦ = NBAcosθ the only difference is the number of turns, N, which has no units! i find this easier to understand if we use the H field (instead of the B)returning to the B field (where the concept of "turn" as a unit is unnatural ): B = µH = µnI B flux (from the Nturn primary) = µNIA/L webers B flux linkage (through the Mturn secondary) = µMNIA/L webers 



#3
Mar1612, 03:50 PM

P: 1,506

I agree with Tiny tim reference to number of turns, N,
If you have one turn of area A in a magnetic flux density of B tesla (webers/m^2) then the flux phi = B*A webers. If there are N turns then the effective flux is N times greater = NBA This is called magnetic flux linkage 


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