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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Concept explainers

Forming and Shaping

Metal forming is a category of metalworking process through which the material can be given the desired shape and size by subjecting it to plastic deformation, where the component undergoes bulk deformation process upon application of loads. Unlike the shearing and machining process, the material does not undergo up to a failure point as indicated in the stress-strain curve. Hence, the stresses induced during the forming process are greater than yield strength but less than the failure strength of the material. The process does not lead to the loss of material, so it can be said to be an economical process. During forming, the material is subjected to tensile forces, compressive forces, bending, and shearing loading conditions. The material should possess the property of ductility to undergo the forming process.

Question

A punching press is driven by
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
constant torque electric motor. The press is

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