A punching press is driven by a constant torque electric motor. The press is provided with a flywheel that rotates at a maximum speed of 225 rpm. Radius of gyration of the flywheel is 0.5 m. The press punches 720 holes per hour, each punching operation takes 2 seconds and requires 15 kNm of energy. Find the motor power required and cross section of the flywheel if the speed of the same must not fall below 200 rpm. The flywheel has a rectangular cross section with width equal to three times the thickness. Density of flywheel material is 5400 kg/m³

A punching press is driven by a constant torque electric motor. The press is provided with a flywheel that rotates at a maximum speed of 225 rpm. Radius of gyration of the flywheel is 0.5 m. The press punches 720 holes per hour, each punching operation takes 2 seconds and requires 15 kNm of energy. Find the motor power required and cross section of the flywheel if the speed of the same must not fall below 200 rpm. The flywheel has a rectangular cross section with width equal to three times the thickness. Density of flywheel material is 5400 kg/m³

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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The variation diagram of the cutting force of the cutting work done with the press shown in the figure is given in the figure. Engine speed is 1400 rpm, flywheel speed is 75 rpm. The moment of inertia of the rotating masses in the engine is 0.75 kgm^2. Calculate the flywheel moment of inertia required for the press so that the velocity unevenness is 0.02. It is known that the engine power is 2 kW.
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