Inductors on parallel

[daveleonard]

With respect to inductors in parallel, do we take the largest value and divide by the number of inductors? Exp: three inductors identical valued at 90 milihenrys are connected in parallel. The total equivalent inductance is equal to? Answer is 30MH. I know the answer because it is part of a practice exam but I want to know the formula to use or is my formula above correct?

 

[K3DCX]

Same law as resistors.

Total L of uncoupled inductors in parallel is equal to the reciprocal of the sum of the reciprocal of each inductor.

Ltotal = 1/((1/L1) +(1/L2) + (1/L3) + (1/Ln))




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[majoco]

Ltotal = 1/((1/L1) +(1/L2) + (1/L3) + (1/Ln))

....providing that they are not close enough together to get some flux linkage.

 

[K3DCX]

Hence the word "uncoupled"




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[ka3nxn]

It's basically the same formula as for resistors in parallel

 

[majoco]

My apologies - I missed that bit!