Discussion
A drive whose load falls to a small fraction of rated for long periods should be
Answer: A
Correct answer: operated with flux reduction or sized more closely
A machine running for long periods at a small fraction of its rating spends most of its energy on losses that do not depend on the load. The two remedies both address that: reduce the flux so the magnetising and core losses fall, or fit a smaller machine so the load is a larger fraction of its rating. Fitting a larger machine makes the problem worse, which is why oversizing for margin is a false economy.
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