Ideal actuator motor model with hysteresis and finite actuation speed.
If the current actuator position y is below (or above) the
input signal u by an amount bigger than the hysteresis
delta, then the position y is increased (decreased)
until it reaches u.
The output y is bounded between 0 and 1.
Note: This model can introduce state events which increase the computation time.
For a more efficient implementation that approximates a motor, set in
the valve or damper model the parameter use_inputFilter=true
instead of using this motor model.
See also
Buildings.Fluid.Actuators.UsersGuide.
filteredInput to use_inputFilter.int the attribute
y(stateSelect=StateSelect.always). Without this attribute,
the model
Buildings.Fluid.Examples.TwoWayValves sets y=3
which is consistent with this model.