The rotor of an electric motor has an angular velocity of 3600 rpm when the load and power are cut off. The 50-kg rotor then coasts to rest after 5000 revolutions. Knowing that the kinetic friction of the rotor produces a couple of magnitude 4 N - m, determine the centroidal radius of gyration of the rotor (I= mk ). (Answer. k= 188.1mm)

Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
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The rotor of an electric motor has an angular velocity of 3600 rpm when the load and
power are cut off. The 50-kg rotor then coasts to rest after 5000 revolutions. Knowing
that the kinetic friction of the rotor produces a couple of magnitude 4 N - m, determine
the centroidal radius of gyration of the rotor (I = mk ). (Answer: k = 188.1mm)
Transcribed Image Text:The rotor of an electric motor has an angular velocity of 3600 rpm when the load and power are cut off. The 50-kg rotor then coasts to rest after 5000 revolutions. Knowing that the kinetic friction of the rotor produces a couple of magnitude 4 N - m, determine the centroidal radius of gyration of the rotor (I = mk ). (Answer: k = 188.1mm)
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