Discussion
True or false: the load torque of a drive always opposes the motion.
Answer: D
Correct answer: False, since active loads such as gravity can drive the motor round
Passive loads - friction, windage, a fan - always oppose the motion and reverse sign when it reverses. An active load carries its own energy: a suspended weight pulls in the same direction whichever way the drum turns, so it opposes the hoist and drives the lower. That is what makes the fourth quadrant necessary on a hoist drive, and what makes regeneration worth having there.
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