Answered: A permanent-magnet DC motor has the…

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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Question

A permanent-magnet DC motor has the following specifications:

Motor Armature Supply Voltage = V_M = V_A = 18 V

Motor Armature Resistance = R_A = 14 Ω

Motor back emf proportionality constant = K_b’ = 1.2 x 10 ^{̶ 3} V/rpm

Motor speed = N_M = 7000 rpm

Find the motor armature current (I_A) through the motor armature.

Expert Solution

Step 1

A machine where electrical energy to mechanical energy conversion takes place is called a motor. A d.c. motor works on the principle that a force is exerted when a current carrying conductor is placed in a magnetic field. A d.c. motor consists of three main components. They are:

The magnetic field system
The rotating armature and
Commutator and brushgear assembly

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