17
In [18], Kalsi examines the effects of momentary supply interruptions on large deep-bar rotor
induction motors using a constant speed solution. His analytical approach assumes that the
rotor speed does not decrease while the line voltage is removed. This assumption causes
inaccurate results and the author admits that a constant speed approach should not be used
when solving for transients due to momentary service interruptions. Experimental and
analytical data for the torque transients are not provided since the experimental and analytical
data didn't agree.
In [19], Landy, Levy, McCulloch, and Meyer use an improved deep-bar model and show that
the deep-bar properties increase the magnitude of the transient peaks during a momentary
service interruption. Figure 13 shows the removal of the supply voltage for 8 cycles. Deep-
bar properties are not included in Fig 13. Fig 14, on the other hand, shows the results of the
same simulation with deep-bar properties included. Obviously including the deep-bar
properties increases the magnitude of the predicted torque transient.
Figure 13 Computed torque and speed transients due to a momentary service
interruption. Figure 4 in [19]
Figure 14 Computed torque and speed transients with deep-bar properties due to a
momentary service interruption. Figure 5 in [19]
Summary :
In [19], Landy, Levy, McCulloch, and Meyer use an improved deep-bar model and show that the deep-bar properties increase the magnitude of the transient peaks during a momentary service interruption. Figure 4 in [19] Figure 14 Computed torque and speed transients with deep-bar properties due to a momentary service interruption.
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deepbar,properties,figure,momentary,speed,transients,serice,torque,interruption,due,analytical,magnitude,shows