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5. A DC motor coupled to a large grinder develops 120 HP at a constant speed of 700 moment of inertia of the revolving parts is J = 2,500 lbft². rpm. The (a) Calculate the torque [Nm] developed by the motor using P=nT/9.55 and the fact that when the speed is constant, moment of inertia does not become effective.

5. A DC motor coupled to a large grinder develops 120 HP at a constant speed of 700 moment of inertia of the revolving parts is J = 2,500 lbft². rpm. The (a) Calculate the torque [Nm] developed by the motor using P=nT/9.55 and the fact that when the speed is constant, moment of inertia does not become effective.

Elements Of Electromagnetics
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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6. A DC motor coupled to a large grinder develops 120 HP at a constant speed of 700 rpm. The moment of inertia of the revolving parts is J = 2,500 lbft². (a) Calculate the torque [Nm] developed by the motor using P=nT/9.55 and the fact that when the speed is constant, moment of inertia does not become effective. (b) Calculate the motor torque [Nm] needed so that the speed will increase to 750 rpm in 5s (from 0 to 5 s). Hint: Use the equation: An=9.55T^t/J where An is the speed difference, At is the time difference and J is the inertia.
Transcribed Image Text:6. A DC motor coupled to a large grinder develops 120 HP at a constant speed of 700 rpm. The moment of inertia of the revolving parts is J = 2,500 lbft². (a) Calculate the torque [Nm] developed by the motor using P=nT/9.55 and the fact that when the speed is constant, moment of inertia does not become effective. (b) Calculate the motor torque [Nm] needed so that the speed will increase to 750 rpm in 5s (from 0 to 5 s). Hint: Use the equation: An=9.55T^t/J where An is the speed difference, At is the time difference and J is the inertia.
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