This information is part of the Modelica Standard Library maintained by the Modelica Association.

This model demonstrates a soft start of an induction machine: Voltage ramp is started at 0.1 s and should ramp up to nominal voltage within 4s, but current is limited to 2.5 times nominal current. At 5.5 s a voltage ramp down within 3 s is required.

Reference voltage is controlled by the softStartControl block, reference voltage is converted to firing angle by the voltageToAngle block. Firing angle is processed by the Signal2mPulse adaptor to firing signals which are applied to the triac.

Compare starting with firing angle by starting direct on line, star-delta starting, and starting via a transformer.

VNominal	Value: 100 Type: Voltage (V) Description: Nominal RMS voltage line to line
INominal	Value: 100 * y2d Type: Current (A) Description: Nominal RMS current at the terminals
fNominal	Value: aimcData.fsNominal Type: Frequency (Hz) Description: Nominal frequency
JLoad	Value: aimcData.Jr Type: Inertia (kg·m²) Description: Load's moment of inertia
TLoad	Value: 161.4 Type: Torque (N·m) Description: Nominal load torque
wLoad	Value: 1440.45 * 2 * Modelica.Constants.pi / 60 Type: AngularVelocity (rad/s) Description: Nominal load speed
aimcData	Value: Type: IM_SquirrelCageData