Image:Commutator - Advance for Self Induction.png

[edit] Summary

[edit] Illustration Description

Figure 303 -- Commutator brush adjustment for self-induction

• For convenience an electric current is considered to have weight and hence possessing the property of inertia. The current then during commutation cannot be instantly brought to rest and started in the opposite direction, but these changes must be brought about gradually by an opposing force.
• Hence by advancing the brushes beyond the neutral plane as shown in this illustration, commutation takes place with the short-circuited coil cutting the lines of force so as to induce a current in the opposite direction. This opposes the motion of the current in the short circuited coil, brings it to rest, and starts it in the opposite direction, thus preventing sparks at the brush.

[edit] Public Domain Source

• Hawkins Electrical Guide, Volume 1
• Chapter 20: Commutation and the Commutator
• Page 287, Figure 303
• Copyright 1917 by Theo. Audel & Co.
• Printed in the United States

[edit] Upload Notes

• Scanned by Dale Mahalko, Gilman, WI, USA on 13:42, 20 May 2008 (UTC)
• Scanned at 600dpi, 8-bit grayscale using MicroTek ScanMaker 3600
• Level-adjusted and cleaned up using Gimp 2.4.4

[edit] See Also

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

[edit] Licensing:

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• Commutator (electric)