Contains the transformation of stator voltage and current from the dq0 reference-frame to the dq0 rotor-frame.
The transformation angle is the (electric) rotor-angle relative to the reference frame.
If 'rotorSys = true', the reference frame is specified by the rotor. This allows to avoid the transformation. In this case, the system choice ('synchronous', 'inertial') has no influence. Note that this choice is not generally possible (for example several machines coupled to one common source).
v_s, i_s: stator-voltage and -current dq0 in the rotor frame of the machine.