Discussion
Two identical drives are to share a common load through a gearbox. The correct arrangement is
Answer: D
Correct answer: one on speed control and the other following its torque
This is the master-slave arrangement, and the reason is the same as before: two speed loops on a common shaft cannot both be satisfied, so they fight, one motoring and one braking. Two torque references with no speed loop leaves the speed uncontrolled altogether.
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