98
-80x10
3
-60
-40
-20
0
T
s-
(in-lb)
100
95
90
85
80
75
70
65
60
55
50
45
40
35
30
25
20
15
10
5
t (cycles)
25x10
3
20
15
10
5
0
T
s+
(in-lb)
2500
2000
1500
1000
500
0
I (A)
1600
1200
800
(rpm)
measured
simulated
Figure 68 Simulated and measured minimum and maximum torque, maximum current
magnitude, and minimum speed plotted as a function of interruption duration for a 75
hp motor using load inertia I1
4.5 STRESS ASSESSMENT
Although the magnitude of the simulated peak shaft torque transient is less than the measured
peak shaft torque transient, the overall behavior of the induction motor model agrees well
with the measurements. The interruption durations at which the worst case transients occur
are accurately simulated. There is no indication that the magnitude of the transients should
be larger than the measured values for the conditions tested. Therefore, the measured shaft
torque is a good measure of the stresses generated in an induction motor during a momentary
service interruption.
Much of prior work presented Section 2 use the electromagnetic torque produced by the
motor as a gauge for the stresses produced during a momentary service interruption.
Summary :
98 -80x10 3 -60 -40 -20 0 T s- (in-lb) 100 95 90 85 80 75 70 65 60 55 50 45 40 35 30 25 20 15 10 5 t (cycles) 25x10 3 20 15 10 5 0 T s+ (in-lb) 2500 2000 1500 1000 500 0 I (A) 1600 1200 800 (rpm) measured simulated Figure 68 Simulated and measured minimum and maximum torque, maximum current magnitude, and minimum speed plotted as a function of interruption duration for a 75 hp motor using load inertia I1 4.5 STRESS ASSESSMENT Although the magnitude of the simulated peak shaft torque transient is less than the measured peak shaft torque transient, the overall behavior of the induction motor model agrees well with the measurements.
Tags :
measured,torque,motor,interruption,simulated,magnitude,shaft,induction,peak,transients,minimum,during,serice