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ABSTRACT

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3.3.4 Experimental Test Plan
The experimental test plan for the comprehensive testing is similar to that of the preliminary
testing. However in this case, the interruption duration is varied from 1 to 99 cycles and
three different load inertias are used for each of three different motors. Table 2 lists the tests.
Table 2 Experimental test plan
Motor
Duration
Inertia 1
1-99 cycles
100%
10 hp
Inertia 2
1-99 cycles
100%
Inertia 3
1-99 cycles
100%
Inertia 1
1-99 cycles
100%
50 hp
Inertia 2
1-99 cycles
100%
Inertia 3
1-99 cycles
100%
Inertia 1
1-99 cycles
100%
75 hp
Inertia 2
1-99 cycles
100%
Inertia 3
1-99 cycles
100%
3.3.5 Experimental Test Results
3.3.5.1
Magnitude of Motor Quantities as a Function of Interruption Duration
As with the preliminary testing, for each interruption duration the absolute value of the peak
current, I, the maximum shaft torque, the minimum shaft torque, and the minimum speed, are
recorded. These values are plotted in Fig 31 as a function of the interruption duration for the
10 hp Inertia 2 case. As expected, the results are similar to the preliminary testing results.
The major difference is that the worst case shaft torque transient now occurs at 7.3 cycles and
the magnitude is greater than the magnitude of the shaft torque transient measured during the
preliminary testing. This is expected since the load inertia is greater.

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