The worktable of a numerical control machine tool is driven by a closed-loop positioning system which consists of a servomotor, leadscrew, and optical encoder. The leadscrew has a pitch of 0.25 in/rev and is coupled directly to the motor shaft. The optical encoder generates 200 pulse/rev. The table has been programmed to move a distance of 7.5 in at a feed rate=20 in/min. (a) How many pulses are received by the control system to verify that the table has moved the programmed distance? What are (b) the pulse rate and (c) motor speed that correspond to the specified feed rate?

The worktable of a numerical control machine tool is driven by a closed-loop positioning system which consists of a servomotor, leadscrew, and optical encoder. The leadscrew has a pitch of 0.25 in/rev and is coupled directly to the motor shaft. The optical encoder generates 200 pulse/rev. The table has been programmed to move a distance of 7.5 in at a feed rate=20 in/min. (a) How many pulses are received by the control system to verify that the table has moved the programmed distance? What are (b) the pulse rate and (c) motor speed that correspond to the specified feed rate?

Understanding Motor Controls

4th Edition

ISBN:9781337798686

Author:Stephen L. Herman

Publisher:Stephen L. Herman

Chapter54: The Operational Amplifier

Section: Chapter Questions

Problem 7RQ: Name two effects of negative feedback.

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Question

The worktable of a numerical control machine tool is driven by a closed-loop
positioning system which consists of a servomotor, leadscrew, and optical encoder.
The leadscrew has a pitch of 0.25 in/rev and is coupled directly to the motor shaft.
The optical encoder generates 200 pulse/rev. The table has been programmed to
move a distance of 7.5 in at a feed rate=20 in/min. (a) How many pulses are received
by the control system to verify that the table has moved the programmed distance?
What are (b) the pulse rate and (c) motor speed that correspond to the specified feed
rate?

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