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English: A rotating magnetic field is a magnetic field which periodically changes direction. This is a key principle to the operation of alternating-current motor. In 1882, Nikola Tesla identified the concept of the rotating magnetic field. In 1888, Tesla gained U.S. Patent 381968 for his work. ....
Deutsch: Elektromagnetischer Motor, U.S. Patent 381968 für Nikola Tesla. Zeichnung aus der Patentschrift. Links: Schaltung und Geometrie des Elektromotors (ringförmiger Eisenkern mit 4 Spulen, linearer Rotor). Rechts: Generator (Rotor zwischen Polschuhen eines Magnets, mit um 90° versetzten Induktionsspulen, kontaktiert über 4 Schleifringe (in der Zeichnung teilweise aufgeschnitten, um die Anschlüsse zu zeigen), Abgriff über 4 Bürsten). Darunter in 8 90°-Schritten (I–VIII): Positionen der 2 Generatorspulen und über die 2 (getrennten) Wechselstromkreise und 4 Motorspulen erzeugte Orientierung des Magnetfelds im Luftraum (!) innerhalb des Magnetrings. Anzunehmen ist das Fließen von zwei um 90° zeitverschobenen Wechselströmen in den 2 Stromkreisen und das Mitnehmen des linear erstreckten Motorrotors. Nicht dargestellt ist, ob dieser aus Weicheisen oder einem Permanentmagnet besteht.
Sene 6 iýun 2006 (original upload date)
Çeşme Transferred from en.wikipedia to Commons by Oxyman using CommonsHelper.
Awtor Rotating magnetic field at iňlis dili Wikipediýa

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Rotating magnetic field from en.wikipedia.org, the copyright holder of this work, hereby publishes it under the following license:
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GNU head Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.2 or any later version published by the Free Software Foundation; with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts. A copy of the license is included in the section entitled GNU Free Documentation License. Subject to disclaimers.
May or may not be in the public domain
 In general, the contents of United States patents are in the public domain.

In specific cases, patent applicants and holders may claim copyright in portions of those documents. In those specific cases, applicants are required to identify the portions that are protected under copyright, and are additionally required to state the following within the body of the application and patent (see 37 CFR 1.71(d) & (e) and 37 CFR 1.84(s), and MPEP § 608.01(e) & (w) and MPEP § 1512):

A portion of the disclosure of this patent document contains material which is subject to (copyright or mask work) protection. The (copyright or mask work) owner has no objection to the facsimile reproduction by any­one of the patent document or the patent disclosure, as it appears in the Patent and Trademark Office patent file or records, but otherwise reserves all (copyright or mask work) rights whatsoever.

The original patent should be checked for the presence of such language before an assumption is made that the contents are in the public domain. (This template can be replaced by {{PD-US-patent-no notice}} in such cases.)

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  • 2006-06-06 18:22 Rotating magnetic field 400×845× (56525 bytes) A rotating magnetic field is a magnetic field which periodically changes direction. This is a key principle to the operation of alternating-current motor. In 1882, Nikola Tesla identified the concept of the rotating magnetic field. In 1888, Tesla gained U

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