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Induction motor starting

The animation illustrates the across-the-line starting of an induction motor. The modeling assumes that the electrical transients can be ignored compared with the slow motional mechanical transients, so that the motor can be represented at any speed ωm by its steady-state torque-speed curve. Given the mechanical load curve, the differential torque ΔT acts to accelerate the rotor inertia. The speed-versus-time curve is obtained by graphical integration as demonstrated, yielding the shown red trace response. The torques Te and Tm and the speed ωm are expressed in per unit; time t and the inertia constant M are expressed in seconds.


The parameters of top applet are automatically copied to the bottom applet..

 © M. Riaz