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4. A DC motor is driven by an input terminal voltage of V4 440 V at 60 Hz in the equivalent circuit below. The motor provides an input current of Ir= 55 A at 1400 rpm turning speed, and it produces an output power of Pout =25 horsepower (hp). The armature resistance is R4= C2 N and the field resistance is RF=80 2. + RF EA Armature a) Find the armature voltage, EA by using Kirchhoff Laws. b) Find the overall Copper Loss (=total power spent on resistors) c) Find the developed Torque by the motor; t= PA /Om= (E4.IA)/Om d) Find the percentage efficiency of motor; 7 where n= Pout/Pin, ratio of output to input powers. [Conversion factor : 1 hp =746 W]

4. A DC motor is driven by an input terminal voltage of V4 440 V at 60 Hz in the equivalent circuit below. The motor provides an input current of Ir= 55 A at 1400 rpm turning speed, and it produces an output power of Pout =25 horsepower (hp). The armature resistance is R4= C2 N and the field resistance is RF=80 2. + RF EA Armature a) Find the armature voltage, EA by using Kirchhoff Laws. b) Find the overall Copper Loss (=total power spent on resistors) c) Find the developed Torque by the motor; t= PA /Om= (E4.IA)/Om d) Find the percentage efficiency of motor; 7 where n= Pout/Pin, ratio of output to input powers. [Conversion factor : 1 hp =746 W]

Introductory Circuit Analysis (13th Edition)
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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(C2=8 )

 

4. A DC motor is driven by an input terminal voltage of V4-440 V at 60 Hz in the equivalent circuit below. The motor provides an input current of Ir= 55 A at 1400 rpm turning speed, and it produces an output power of Pout =25 horsepower (hp). The armature resistance is R4= C2 N and the field resistance is RF=80 2. + RF EA Armature a) Find the armature voltage, E4 by using Kirchhoff Laws. b) Find the overall Copper Loss (=total power spent on resistors) c) Find the developed Torque by the motor; t= PA /Om= (E4.IA)/Om d) Find the percentage efficiency of motor; 7 where n= Pout/Pin, ratio of output to input powers. [Conversion factor : 1 hp =746 W]
Transcribed Image Text:4. A DC motor is driven by an input terminal voltage of V4-440 V at 60 Hz in the equivalent circuit below. The motor provides an input current of Ir= 55 A at 1400 rpm turning speed, and it produces an output power of Pout =25 horsepower (hp). The armature resistance is R4= C2 N and the field resistance is RF=80 2. + RF EA Armature a) Find the armature voltage, E4 by using Kirchhoff Laws. b) Find the overall Copper Loss (=total power spent on resistors) c) Find the developed Torque by the motor; t= PA /Om= (E4.IA)/Om d) Find the percentage efficiency of motor; 7 where n= Pout/Pin, ratio of output to input powers. [Conversion factor : 1 hp =746 W]
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