After Michael Faraday (1791-1867) produced an electromotive force (EMF) between the axis and edge of a disk kept in rotation and subjected to the axial magnetism of a fixed permanent magnet in 1831, several researchers and experimenters pursued efficient electrogeneration designs capable of replacing expensive electrochemical batteries [1]. It was soon clear that a stronger effect could be achieved with an electromagnetic multiplier (i.e., a coil of many windings) subjected to the alternating action of a permanent magnet, obtained by mutual rotation.

中文翻译：

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交流回转机械的发展[历史]

1831 年，迈克尔·法拉第 (Michael Faraday) (1791-1867) 在保持旋转的圆盘的轴和边缘之间产生电动势 (EMF) 并受到固定永磁体的轴向磁力作用后，几位研究人员和实验人员开始追求高效的发电设计，能够取代昂贵的电化学电池[1]。很快就很清楚，电磁倍增器（即许多绕组的线圈）受到永磁体的交替作用（通过相互旋转获得）可以实现更强的效果。