A 250 V shunt motor, having an armature resistance of 0.2 ohm draws from the mains a current of 50 A on half full load. The speed is to be increased to twice half full load speed. If the torque of the motor is of constant magnitude, determine the percentage change in flux required. [Ans. 52.29]

A 250 V shunt motor, having an armature resistance of 0.2 ohm draws from the mains a current of 50 A on half full load. The speed is to be increased to twice half full load speed. If the torque of the motor is of constant magnitude, determine the percentage change in flux required. [Ans. 52.29]

Delmar's Standard Textbook Of Electricity

7th Edition

ISBN:9781337900348

Author:Stephen L. Herman

Publisher:Stephen L. Herman

Chapter5: Resistors

Section: Chapter Questions

Problem 1PA

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Concept explainers

DC Series Motors

A DC motor is a type of electric motor which converts electric energy into mechanical energy. The forces that are produced by the magnetic field are what those common types of motors rely upon. Either electro-mechanical or electronic, all types of DC motors have some internal mechanism to change the current direction in part of the DC motors. As the DC motors could be powered from existing DC lighting power distribution systems, these motors were the first form of motors widely used. By changing the strength of the current in its field winding or by using a variable supply voltage, the speed of the DC motors can be controlled over a wide range.

Question

A 250 V shunt motor, having an armature resistance of 0.2 ohm draws from
the mains a current of 50 A on half full load. The speed is to be
increased to twice half full load speed. If the torque of the motor is of
constant magnitude, determine the percentage change in flux required.
[Ans. 52.29]

I WANT A DIFFRENT APPROACH (NOT COPY PASTE ON LIBRARY)

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