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Q#1
AC and DC Drives
GATE EE 1998
MSQ
+2 marks
-0 marks
In a speed controlled d.c. motor drive, the load torque is 40Nm. At time t=0, the operation is under steady state condition and speed is 500rpm. Under this condition at , the generated torque is instantly increased to 100Nm. The inertia of the drive is . The friction is negligible
(a) Write down the differential equation governing the speed of the drive for t>0
(b) Evaluate the time taken for the speed to reach 1000 rpm
Time taken for the speed to reach 1000 rpm = 4.46 ms
Time taken for the speed to reach 1000 rpm = 8.73 ms
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