a. Brrefly explairn the effect offield current change on aSynchrzomous motOR with thehelp of a veetore diagram2b. A 480V GOHZ, 400 hp:0.80 Pfleading 6 pole, deta connectedSynchrzonoua motore has aSynchzonowa reactance of1:1 ohm and negligible armaturereenintance. Agnore frietion,windage and coce lomea.Ignone fruieion,Ogf thin motore în i400 hp at o:80 Pf lagging, whatare the magnitudes andof EA and IA ?nitiallysupplyingangleraT How nuch toTRaue in thinmotorR preoducing?Sf eld excitiation sn mereasedby 20% ,what would be thenew magnitude of EA and thetoraue angle ?

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Electrical Engineering

a. Brtefly explain the effect of field current change on a Synchreonous motOR with the help of a vector diagram2

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

Synchronous Motor

The synchronous motor is an AC electric type motor where at a steady-state the shaft rotation is synchronized with the supply current variable-frequency. To an integral number of AC cycles, the rotation period is exactly equal. The stator of the motor in the synchronous motor contains multi-phase AC electromagnets due to which a magnetic field is created that rotates in time with the oscillation of the line current. The rotor contains a permanent magnet and the rotor rotates in synchronization with the stator field at the same rate and provides the second synchronized magnetic field which is rotating in nature as a result. When the synchronous motor is supplied with independently excited multi-phase AC electromagnets on both the rotor and the stator, it is termed as a doubly-fed machine. The most widely used AC-type motors are the synchronous AC motor and the induction AC motors.

Question

a. Brrefly explairn the effect of
field current change on a
Synchrzomous motOR with the
help of a veetore diagram2
b. A 480V GOHZ, 400 hp:0.80 Pf
leading 6 pole, deta connected
Synchrzonoua motore has a
Synchzonowa reactance of
1:1 ohm and negligible armature
reenintance. Agnore frietion,
windage and coce lomea.
Ignone fruieion,
Ogf thin motore în i
400 hp at o:80 Pf lagging, what
are the magnitudes and
of EA and IA ?
nitiallysupplying
anglera
T How nuch toTRaue in thin
motorR preoducing?
Sf eld excitiation sn mereased
by 20% ,what would be the
new magnitude of EA and the
toraue angle ?

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