RotationalMotor is MachineModeling.Connections.Pivot.Actuated.Base:
    .doc: """
    Hinge pivot connection driven directly by a rotational actuator.

    Use this variant when the actuator torque is applied about the hinge
    axis.
    """
    with MachineModeling.Connections.Pivot.Actuated.Configurations.Hinge

    actuator becomes MachineModeling.Actuators.Rotational.Base
