Q1: Fill in the following blanks: 4. The back e.m.f. in a d.c. motor .. . the applied voltage and when it is equal to applied voltage the mechanical power will be maximized. 5. The deciding factor in the selection of a d.c. motor for a particular application is its characteristic.
Q1: Fill in the following blanks: 4. The back e.m.f. in a d.c. motor .. . the applied voltage and when it is equal to applied voltage the mechanical power will be maximized. 5. The deciding factor in the selection of a d.c. motor for a particular application is its characteristic.
Introductory Circuit Analysis (13th Edition)
13th Edition
ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
Chapter1: Introduction
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4. The back emf in a dc motor opposes the applied voltage and when it is equal to half of applied voltage tye mechanical power will be maximized.
We know that for a dc motor, Eb= V- IaRa
Where Eb= back emf
V = applied voltage
Ia= armature current
Ra= armature resistance
Thus back emf always opposes the applied voltage.
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