14
Figure 9 Computed electrical torque due to a momentary service interruption. Figure
13 in [14]
Figure 10 Computed speed due to a momentary service interruption. Figure 14 in [14]
Since the analytical results and experimental results in Fig 6 agreed reasonably well, the
authors of [9] extend the analysis to larger motors. Fig 11 shows the analytical solution
extended to a 100 hp induction motor with three different load inertias. The per unit
magnitude of the negative torque peak (measured torque / rated torque) is plotted as a
function of the interruption duration. Fig 11 shows that severe negative torque transients
only occur at certain interruption durations, as also reported by [14]. This behavior is
expected. Fig 5 from the previous section shows that the magnitude of the negative torque
peaks will be greatest when the supply voltage is reapplied at the instant the back-emf from
the motor and the supply voltage are about 200 degrees out of phase. Since the rotor speed
Summary :
14 Figure 9 Computed electrical torque due to a momentary service interruption. The per unit magnitude of the negative torque peak (measured torque / rated torque) is plotted as a function of the interruption duration.
Tags :
torque,figure,interruption,fig,shows,negatie,magnitude,computed,supply,results,motor,speed,serice