A) A DC series motor has armature resistance of 0.6 Q and series field resistance of 0.4 0. The speed of the motor is 300 rpm and draws a current of 15 A when supplying a certain load. Neglect rotational losses and assume that there is no external resistance connected to the armature circuit. Find the torque developed by this machine, if you know that the motor is a 220 V, 7 hp DC series motor.

A) A DC series motor has armature resistance of 0.6 Q and series field resistance of 0.4 0. The speed of the motor is 300 rpm and draws a current of 15 A when supplying a certain load. Neglect rotational losses and assume that there is no external resistance connected to the armature circuit. Find the torque developed by this machine, if you know that the motor is a 220 V, 7 hp DC series motor.

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

Speed control of motor

Speed control by DC motor-speed controller is required to realize variable speed drive. Whenever a motor drives a particular load, it is called drive, and variable speed drive refers to a load requiring variable speed. All this is obtained by a DC motor speed controller.

Question

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A) A DC series motor has armature resistance of 0.6 Q and series field resistance of 0.4 0.
The speed of the motor is 300 rpm and draws a current of 15 A when supplying a certain
load. Neglect rotational losses and assume that there is no external resistance
connected to the armature circuit. Find the torque developed by this machine, if you
know that the motor is a 220 V, 7 hp DC series motor.

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