The rotor of an electric motor has an angular velocity of 3520 rpm when the load and power are cut off. The 110-lb rotor, which has a centroidal radius of gyration of 9 in., then coasts to rest. Knowing that the kinetic friction of the rotor produces a couple of magnitude 2.5 lb-ft, determine the number of revolutions that the rotor executes before coming to rest. The number of revolutions that the rotor executes before coming to rest is rev.

The rotor of an electric motor has an angular velocity of 3520 rpm when the load and power are cut off. The 110-lb rotor, which has a centroidal radius of gyration of 9 in., then coasts to rest. Knowing that the kinetic friction of the rotor produces a couple of magnitude 2.5 lb-ft, determine the number of revolutions that the rotor executes before coming to rest. The number of revolutions that the rotor executes before coming to rest is rev.

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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Question

The rotor of an electric motor has an angular velocity of 3520 rpm when the load and power are cut off.
The 110-lb rotor, which has a centroidal radius of gyration of 9 in., then coasts to rest. Knowing that the
kinetic friction of the rotor produces a couple of magnitude 2.5 lb-ft, determine the number of revolutions
that the rotor executes before coming to rest.
The number of revolutions that the rotor executes before coming to rest is
rev.

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Step 1: Determine the number of revolution that the rotor executes coming to rest.

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Step 2: Calculate the kinetic energy of the flywheel.

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Step 3: Calculate the number of revolution before coming to rest.

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