The ComplexLib uses three kinds of connectors: one for phasor description of
single-phase AC circuits (ComplexPin), one for phasor description of
multi-phase AC circuits (ComplexPlug), and one for coupling with
components from rotational mechanics (Flange_a or Flange_b).
The phasor-based connectors are defined within the corresponding packages, see
The mechanical connector of the Modelica Standard Library is used for mechanical subsystem in the package ComplexLib.Machines.