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Rotor (electric)
The rotor is a moving component of an electromagnetic system in the electric motor, electric generator, or alternator. Its rotation is due to the interaction between the windings and magnetic fields which produces a torque around the rotor's axis.〔Staff. "Understanding Alternators. What Is an Alternator and How Does It Work." N.p., n.d. Web. 24 November 2014 http://alternatorparts.com/understanding-alternators.html.〕
==Early Development==
An early example of electromagnetic rotation was the first rotary machine built by Istvan Jedlik with electromagnets and a commutator, in 1826-27.〔Ing Doppelbauer Martin Dr. The Invention of the Electric Motor 1800-1854. 29th Web. November, 2014.: Web. 28th November, 2014.http://www.eti.kit.edu/english/1376.php〕 Other pioneers in the field of electricity include Hippolyte Pixii who built an alternating current generator in 1832, and William Ritchie's construction of an electromagnetic generator with four rotor coils, a commutator and brushes, also in 1832. Development quickly included more useful applications such as Moritz Hermann Jacobi's motor that could lift 10 to 12 pounds with a speed of one foot per second, about 15 watts of mechanical power in 1834. In 1835, Francis Watkins describes an electrical "toy" he created; he is generally regarded as one of the first to understand the interchangeability of motor and generator.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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