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Newnes Circuit Calculations Pocket Book
book

Newnes Circuit Calculations Pocket Book

by Thomas J. Davies
April 2016
Intermediate to advanced content levelIntermediate to advanced
384 pages
12h 56m
English
Newnes
Content preview from Newnes Circuit Calculations Pocket Book
20 Two- and three-phase systems
20.1
Introduction
Chapter 6 considered the generation of an a.c. voltage by means of
a single coil rotating in a magnetic field. Such an arrangement
produces a single sinusoidal voltage and is referred to as a single-
phase a.c. supply. Single-phase supplies have certain disadvantages
and these disadvantages can be overcome by increasing the number
of alternator windings.
20.2 Two-phase supply
In a two-phase alternator there are two equal voltage sources. Two
coils displaced by 90° (see Figure 20.1) are rotated in a magnetic
field. This arrangement generates two voltages with a phase diffe-
rence of 90°
(IT/2
radians) ...
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Publisher Resources

ISBN: 9781483101132