4.9 A 6-pole, 3-phase alternator running at 1000 rpm supplies to an 8-pole, 3-phase induction motor which has a rotor current of frequency 2 Hz. The speed at which the motor operates is (b) 960 rpme (a) 1000 rpm (c) 750 rpm (d) 720 rpm

4.9 A 6-pole, 3-phase alternator running at 1000 rpm supplies to an 8-pole, 3-phase induction motor which has a rotor current of frequency 2 Hz. The speed at which the motor operates is (b) 960 rpme (a) 1000 rpm (c) 750 rpm (d) 720 rpm

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 Generator

In comparison to an asynchronous generator, it is a machine where the rotor speed is equal to the rotating magnetic field produced by the stator, i.e., mechanical speed is equal to the electrical speed, thus called synchronous, and not asynchronous.

Salient Pole Rotor

Salient pole rotor includes a large number of exposed poles mounted on a magnetic wheel. The construction of a bright pole is as shown in the image on the left. The proposed poles are made of metal laminations. The rotor winding is provided on these poles and is supported by pole shoes.

Question

eriquin(d) 720 rpm
1 4.9 A 6-pole, 3-phase alternator running at
1000 rpm supplies to an 8-pole, 3-phase induction
motor which has a rotor current of frequency 2 Hz.
The speed at which the motor operates is
(a) 1000 rpm
(b) 960 rpm
(c) 750 rpm

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