A 480-V, 60 Hz, 400-hp 0.8-PF-leading eight-pole delta-connected synchronous motor has a synchronous reactance of 0.6 Q and negligible armature resistance. Ignore its friction, windage, and core losses for the purposes of this problem. Assume that EA is directly proportional to the field current IF (in other words, assume that the motor operates in the linear part of the magnetization curve), and that EA =480 V when IF = 4 A. (a) What is the speed of this motor.(b) If this motor is initially supplying 400 hp at 0.8 PF lagging, what are the magnitudes and angles of EA and IA.(c) How much torque is this motor producing? What is the torque angle How near is this value to the maximum possible induced torque of the motor for this field current setting.(d) If EA is increased by 30 percent, what is the new magnitude of the armature current? What isthe motor's .new power factor

A 480-V, 60 Hz, 400-hp 0.8-PF-leading eight-pole delta-connected synchronous motor has a synchronous reactance of 0.6 Q and negligible armature resistance. Ignore its friction, windage, and core losses for the purposes of this problem. Assume that EA is directly proportional to the field current IF (in other words, assume that the motor operates in the linear part of the magnetization curve), and that EA =480 V when IF = 4 A. (a) What is the speed of this motor.(b) If this motor is initially supplying 400 hp at 0.8 PF lagging, what are the magnitudes and angles of EA and IA.(c) How much torque is this motor producing? What is the torque angle How near is this value to the maximum possible induced torque of the motor for this field current setting.(d) If EA is increased by 30 percent, what is the new magnitude of the armature current? What isthe motor's .new power factor

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

100%

A 480-V, 60 Hz, 400-hp 0.8-PF-leading eight-pole delta-connected
synchronous motor has a synchronous reactance of 0.6 Q and negligible
armature resistance. Ignore its friction, windage, and core losses for the
purposes of this problem. Assume that EA is directly proportional to the
field current IF (in other words, assume that the motor operates in the
linear part of the magnetization curve), and that EA =480 V when IF = 4 A.
(a) What is the speed of this motor.(b) If this motor is initially supplying
400 hp at 0.8 PF lagging, what are the magnitudes and angles of EA and
IA.(c) How much torque is this motor producing? What is the torque angle
How near is this value to the maximum possible induced torque of the
motor for this field current setting.(d) If EA is increased by 30 percent,
what is the new magnitude of the armature current? What isthe motor's
.new power factor

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both parts fast plz don't answer 3.00 pm