An ideal frequency inverter is modeled by using a VfController
and a three-phase SignalVoltage.
Frequency is raised by a ramp, causing the 
reluctance machine to start, and accelerating inertias. At time
tStep a load step is applied.
Simulate for 1.5 seconds and plot (versus time):
currentRMSsensorM|E.I: equivalent RMS stator
currentsmrM|E.wMechanical: machine speedsmrM|E.tauElectrical: machine torquerotorAngleM|R.rotorDisplacementAngle: rotor
displacement angle