A single-phase alternator produces at no-load an electromotive force E-230 V of frequency f= 50 Hz. The rotor rotates at a speed n=1000 r.p.m. The synchronous impedance of the stator winding is Z-1.5 Q and its resistance is negligible. 1) Calculate the number of poles of the alternator. 2) Calculate the reactance (X.) of the stator winding. 3) Calculate the flux per pole (0) knowing that the number of stator conductors is 120 and Kapp's coefficient is 2.1

A single-phase alternator produces at no-load an electromotive force E-230 V of frequency f= 50 Hz. The rotor rotates at a speed n=1000 r.p.m. The synchronous impedance of the stator winding is Z-1.5 Q and its resistance is negligible. 1) Calculate the number of poles of the alternator. 2) Calculate the reactance (X.) of the stator winding. 3) Calculate the flux per pole (0) knowing that the number of stator conductors is 120 and Kapp's coefficient is 2.1

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

A single-phase alternator produces at no-load an electromotive force E-230 V of frequency f= 50 Hz.
The rotor rotates at a speed n=1000 r.p.m.
The synchronous impedance of the stator winding is Z-1.5 Q and its resistance is negligible.
1) Calculate the number of poles of the alternator.
2) Calculate the reactance (X.) of the stator winding.
3) Calculate the flux per pole () knowing that the number of stator conductors is 120 and Kapp's coefficient is 2.1
4) The alternator feeds a resistive load which absorbs a current of intensity I-40A. Calculate:
a) The voltage across the terminals of the load (U).
b) The useful power of the alternator (P₁).

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