File:Self Excited vs Magneto.png

Summary
Paraphrased article description:

''A self-excited shunt-wound DC generator is shown on the left, and a magneto DC generator with permanent field magnets is shown on the right. The shunt-wound generator output varies with the current draw, while the magneto output is steady regardless of load variations.''

From illustration caption:

''Circuit diagrams to illustrate the difference between a dynamo and a magneto. The former has its field magnets F F magnetized by means of a small current flowing around a shunt circuit. In a magneto the field magnets are permanently magnetized. The strength of the magnetic field of a magneto is constant while that of a dynamo varies with the ouput.''

Public Domain source:
 * Hawkins Electrical Guide, Volume 1
 * Chapter 15: Classes of Dynamo
 * Page 183, Figure 188, 189
 * Copyright 1917 by Theo. Audel & Co.
 * Printed in the United States

For a list of all these illustrations used in Wikipedia please see the article Hawkins Electrical Guide.

Scanned by Dale Mahalko, Gilman, WI, USA

DMahalko (talk) 20:20, 12 January 2008 (UTC)