Discussion
A servo motor differs from an ordinary machine of the same rating in having
Answer: D
Correct answer: a low rotor inertia and a linear torque-speed characteristic
A servo machine is designed to be accelerated and reversed rapidly, so its rotor is made long and slender to minimise inertia, and its torque-speed characteristic is kept linear so the control loop sees a predictable plant. Feedback is part of the system rather than part of the machine.
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