File:Goldschmidt alternator.jpg
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[edit]DescriptionGoldschmidt alternator.jpg |
English: A Goldschmidt alternator, a rotating machine developed in 1908 by Rudolph Goldschmidt for use as a radio transmitter. This example has an output power of 12.5 kW and efficiency of 80% at a frequency of 30 kHz, and 8 to 10 kW at a frequency of 60 kHz. It was installed 1910 by C. Lorentz Co. at their Eberswald wireless station. It consists of a DC motor (left) which drives the alternator (right) through a geartrain (center). In order to produce high frequencies the alternator rotor and stator have a large number of poles, usually 200 to 400. The unique advantage of the Goldschmidt machine was that its rotor and stator were connected to tuned circuits - "reflector circuits" (capacitor bank visible on back wall) - which caused the machine to produce its output power at a multiple (harmonic) of its rotational rate, so it could produce high frequencies without the high rotational speed that the Alexanderson alternator required. The crosshatch (stripe) pattern in the background is not a part of the original image but an aliasing artifact introduced by scanning of the original halftone photo. |
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Source | Retrieved 6 October 2013 from Jonathan Adolf Wilhelm Zennick 1915 Wireless Telegraphy, McGraw-Hill Book Co., New York, p. 219, fig. 264 on Google Books |
Author | Jonathan Adolf Wilhelm Zennick |
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current | 18:16, 3 May 2021 | ![]() | 1,344 × 813 (351 KB) | Materialscientist (talk | contribs) | FFT |
16:38, 11 October 2013 | ![]() | 1,360 × 820 (153 KB) | Chetvorno (talk | contribs) | User created page with UploadWizard |
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