Discussion
Which of these drives most clearly needs four-quadrant capability?
Answer: B
Correct answer: A mine winder
A winder hoists in one direction and lowers in the other, and in each direction it must both accelerate and brake - so all four combinations of torque and speed sign occur in a single cycle. It also has an active load, gravity, which drives the machine during the descent, so the braking is regenerative and the energy substantial. Fans, pumps and conveyors run one way at steady load and need only the first quadrant.
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