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##

Coupled (Mutual) Inductors

- General Form:

`k`*name* *inductor1 inductor2 value*

- Examples:

`k43 laa lbb 0.999
`

kxfrmr l1 l2 0.87

The *inductor1* and *inductor2* are the names of the two
coupled inductors found elsewhere in the circuit, and *value* is
the coefficient of coupling, K, which must be greater than 0 and less
than or equal to 1. Using the ``dot'' convention, one would have a
dot on the first node of each inductor.

This formulation applies when the referenced inductors are linear.
The model is probably not exactly correct in the case of nonlinear
inductors, but results may be close enough in some applications. In
general, use of `mut` with nonlinear inductors is not recommended
but allowed.

Stephen R. Whiteley
2019-06-03