Question 2 A 120-V DC motor rated at 5-hp has a full load efficiency of 86% The field and armature resistances are 60 ohms and 0.75 ohm, respectively. What starter resistance will be required to limit the armature current at starting to 200% of its rated armature current?

Question 2 A 120-V DC motor rated at 5-hp has a full load efficiency of 86% The field and armature resistances are 60 ohms and 0.75 ohm, respectively. What starter resistance will be required to limit the armature current at starting to 200% of its rated armature current?

Introductory Circuit Analysis (13th Edition)

13th Edition

ISBN:9780133923605

Author:Robert L. Boylestad

Publisher:Robert L. Boylestad

Chapter1: Introduction

Section: Chapter Questions

Problem 1P: Visit your local library (at school or home) and describe the extent to which it provides literature...

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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.

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