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Variable permeance controlled by external signal
Magnetic
This component provides a magnetic flux path with a variable permeance. The
component is used to model non-linear magnetic material properties such as
saturation and hysteresis. The permeance is determined by the signal fed into the
input of the component. The flux-rate through a variable permeance is
governed by the equation:
Since is the state variable the equation above must be solved for
. The
control signal must provide the values of
,
and
as a vector. It is the
responsibility of the user to provide the appropriate signals.
When specifying the characteristic of a non-linear permeance, we need to distinguish
carefully between the total permeance and the differential
permeance
.
If the total permeance is known the flux-rate
through a time-varying
permeance is calculated as:
In this case, the control signal for the variable permeance component is:
In most cases, however, the differential permeance is provided to
characterize magnetic saturation and hysteresis. With
the control signal is