Inductance by means of his definition

[Alberto Perez <albertoperarnau@xxxxxxxx>]

Hello,

As you know I'm simulating an induction motor, now I'm calculating inductance. I read manual of femm where it says to calculate inductance by energy. I use this method, but I find another method where it uses integer of A, the equation is:

 

 L = [N*h/Scopper*(integer A in section Scopper+ - integer A in section Scopper- )]/i

where

N : number of turns

h : depth

Scopper : section

i: current

 

Which method is more exact or are two equals? I think this method is more exact because  the method of energy uses definition of W=1/2Li^2 and  it equals to energy by integer of AJ. This method come of definition of inductance. The results are similars by two methods.

 

Thank you

 

Alberto

 

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