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Equivalent motor mass
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*Introduced in MORe v3.1*

Represents an additional motor inertia. Can be used to model the rotor inertia without explicitly modeling it in FEM.

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Block diagram
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   .. image:: media/mot_equimass.png
      :alt: Equivalent Mass Block Diagram
      :scale: 50 %

==============  ==============================================================
Signal          Description
==============  ==============================================================
:math:`u_f`     Filter output
:math:`u_v`     Coupling link velocity
:math:`u_x`     Coupling link position
:math:`v_{fb}`  Motor velocity. Can be used as feedback in architecture.
:math:`x_{fb}`  Motor position. Can be used as feedback in architecture.
:math:`y`       Motor output. Force acting on coupling link.
==============  ==============================================================

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Parameter
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==============  ====================  =================  ==============================================================
Variable        Units linear          Units rotary       Description
==============  ====================  =================  ==============================================================
Stiffness       :math:`N/m`           :math:`Nm/rad`     Coupling stiffness
Damping         :math:`N s/m`         :math:`Nm s/rad`   Coupling damping
Inertia         :math:`kg`            :math:`kg m^2`     Rotor Inertia
==============  ====================  =================  ==============================================================

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Coupling
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Link selection to represent the motor. The controller output (force/torque) will be applied to the selected link.