A shunt DC motor with a specification of 50-hp, 250-V, 200-A has an armature resistance, RA = 0.050. A starter circuit needs to be designed so that the starting current is at a maximum of 250% of its rated value, and the resistance must be switched out once the current falls to 95% of the rated value. Determine the number of stages needed for the starting resistance and the value of the resistance for each stage.

A shunt DC motor with a specification of 50-hp, 250-V, 200-A has an armature resistance, RA = 0.050. A starter circuit needs to be designed so that the starting current is at a maximum of 250% of its rated value, and the resistance must be switched out once the current falls to 95% of the rated value. Determine the number of stages needed for the starting resistance and the value of the resistance for each stage.

Introductory Circuit Analysis (13th Edition)

13th Edition

ISBN:9780133923605

Author:Robert L. Boylestad

Publisher:Robert L. Boylestad

Chapter1: Introduction

Section: Chapter Questions

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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 shunt DC motor with a specification of 50-hp, 250-V, 200-A has an armature resistance, RA = 0.05 0. A starter
circuit needs to be designed so that the starting current is at a maximum of 250% of its rated value, and the
resistance must be switched out once the current falls to 95% of the rated value. Determine the number of stages
needed for the starting resistance and the value of the resistance for each stage.

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