Discussion
A synchronous motor is chosen in preference to an induction motor for a large compressor because
Answer: B
Correct answer: the efficiency gain and the reactive support both pay at that size
At several megawatts a point or two of efficiency is a large sum each year, and a machine that supplies rather than absorbs reactive power can improve the whole plant’s power factor. Both benefits scale with rating while the extra cost of the excitation system does not, so the balance tips at large sizes.
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