Q.4(a) Briefly explain the following DC motors: -(i)Separately excited DC Motor(ii)(ii)(b) (i)(ii)(ii)Permanent magnet DC Motor(c) A permanent magnet DC machine is operated at a constant speed of 3000 rpmsuch that the back emf armature voltage is 125 V. The armature resistance is 0.04. Calculate:(i)Sketch the equivalent circuit for the separately excited DC machine.Sketch the power flow diagram of an induction motor. Label the diagramproperly by showing the input power, output power and all related powerlosses.(iv)the armature current.input power at the terminal.(iii) developed power and developed torque.when the terminal voltage is 129 V.Then,determine whether the machine is acting as a motor or generator.Justify your answer.(d) A four-pole, Y-connected induction motor is fed with a 230 V, 50 Hz supplyhas a full-load slip of 5%. Determine: -(i) the synchronous speed.the rotor speed.

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Answered: Q.4 (a) Briefly explain the following…

Q.4 (a) Briefly explain the following DC motors: - (i) Separately excited DC Motor (ii) Permanent magnet DC Motor nlent circuit for the separately excited DC

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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Question

Q.4
(a) Briefly explain the following DC motors: -
(i)
Separately excited DC Motor
(ii)
(ii)
(b) (i)
(ii)
(ii)
Permanent magnet DC Motor
(c) A permanent magnet DC machine is operated at a constant speed of 3000 rpm
such that the back emf armature voltage is 125 V. The armature resistance is 0.04
. Calculate:
(i)
Sketch the equivalent circuit for the separately excited DC machine.
Sketch the power flow diagram of an induction motor. Label the diagram
properly by showing the input power, output power and all related power
losses.
(iv)
the armature current.
input power at the terminal.
(iii) developed power and developed torque.
when the terminal voltage is 129 V.
Then,
determine whether the machine is acting as a motor or generator.
Justify your answer.
(d) A four-pole, Y-connected induction motor is fed with a 230 V, 50 Hz supply
has a full-load slip of 5%. Determine: -
(i) the synchronous speed.
the rotor speed.

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