- #1

flowwolf

- 27

- 4

I have an axisymetric magnetics problem in FEMM 4.2. I'm analyzing a loudspeaker motor (permanent magnet included) with many coils.

I would like to get the inductance for the coils connected in series and in parallel.

Let's say that I have 2 coils, coil A (n=N1) and B (n=N2) with circuits A (I=1A) and B (I=1A). The inductance of the two coils are L1, L2, respectively.

Inductance for the individual circuits is calculated according to 3.2 of http://www.femm.info/wiki/woofer

Can I calculate the total inductance, L, the following way:

For series connection, is L equal to L1 + L2 ?

For parallel connection, is L equal to 1/(1/L1 + 1/L2) ?

Maybe this seems to be a simple question, but for multiple coils the mutual inductance needs to be taken into account.

It seems that femm does this, furthermore, for series connection the result seems to be equal to of a single coil (n=N1+N2) with one circuit.

If yes, can the same formulas be used for calculating the blocked inductance? http://www.femm.info/wiki/BlockedImpedance

Any help would by appreciated.

Akos