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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 ω_{m} 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
T_{e} and T_{m}
and the speed ω_{m} 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 |