At start time tOn three phase voltage is supplied
to the 
asynchronous induction machine with sliprings. The machine
starts from standstill, accelerating inertias against load torque
quadratic dependent on speed, using a starting resistance. At time
tRheostat external rotor resistance is shortened, finally reaching
nominal speed.
Simulate for 1.5 seconds and plot (versus time):
currentRMSsensorM|E.I: equivalent RMS stator
currentaimsM/E.wMechanical: machine speedaimsM|E.tauElectrical: machine torque