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File:Rotor of Alexanderson alternator.jpg

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Summary

Description
English: The rotor of a General Electric 200 kW Alexanderson alternator, a type of radio transmitter used from 1906 to 1930. The rotor consists of a disk made of high tensile magnetic steel with narrow slots cut in its periphery, creating a series of blades which form the magnetic "poles" of the machine. The slots are filled with bronze to give the rotor a smooth surface. The rotor has no conductive windings and the machine operates by induction. A stator with an equal number of poles around the periphery of the rotor creates a magnetic field axially through the side of the rotor. When the stator and rotor poles line up the magnetic flux through the pole increases. When the rotor poles are between two stator poles the magnetic flux decreases. This induces a radio frequency alternating current in the stator wondings. The rotor weighs 5500 lb. The air gap between the rotor and stator on each side is only 1 mm, maintained by a complicated thrust bearing system. It turned at 2170 RPM and the alternator transmitted at 22. 1 kHz. It was installed in September 1918 at RCA's New Brunswick, N.J. station

Alterations to image: Removed aliasing artifacts (background grid of stripes) introduced by scanning halftone photo, using the Gimp FFT filter.
Date
Source Downloaded 3 October 2013 from Elmer E. Bucher (1920) Technical Description of the Alexanderson System, The Wireless Press, Inc., New York, p. 14, fig. 10 on Google Books
Author Elmer E. Bucher

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Public domain
This work is in the public domain in the United States because it was published (or registered with the U.S. Copyright Office) before January 1, 1929.

Public domain works must be out of copyright in both the United States and in the source country of the work in order to be hosted on the Commons. If the work is not a U.S. work, the file must have an additional copyright tag indicating the copyright status in the source country.
Note: This tag should not be used for sound recordings.PD-1923Public domain in the United States//commons.wikimedia.org/wiki/File:Rotor_of_Alexanderson_alternator.jpg

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Date/TimeThumbnailDimensionsUserComment
current21:38, 3 October 2013Thumbnail for version as of 21:38, 3 October 20131,863 × 1,162 (116 KB)ChetvornoUser created page with UploadWizard

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