Mutual Inductance And Wire Length

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Original poster: "Jared Dwarshuis" <jdwarshuis@xxxxxxxxx>


Mutual Inductance And Wire Length





For two coaxial close packed coils  the mutual inductance (M) in 
units of Henry is written as   M = pi u N1 N2 (R2)sqrd / 2 
(R1)   (where R1 is significantly greater then R2)



Multiplying the numerator and denominator by  4pi  N2  N1  and 
regrouping we get:



M  = u  (wire length 2)sqrd  (N1)sqrd / 4 (wire length 1) N2



This formulae should provide a close approximation for the mutual 
inductance of a loosely coupled primary around the secondary of a 
"closely packed" half wave coil.



Jared Dwarshuis