After that Michael Faraday (1791–1867) produced an electromotive force between the axis and edge of a disc kept in rotation and subjected to the axial magnetism of a fixed permanent magnet in 1831, several researchers and experimenters pursued efficient electro-generation designs capable the 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 several winding) subject to the alternating action of a permanent magnet, obtained by mutual rotation.
The development of ac rotary machines
Guarnieri, Massimo
2018
Abstract
After that Michael Faraday (1791–1867) produced an electromotive force between the axis and edge of a disc kept in rotation and subjected to the axial magnetism of a fixed permanent magnet in 1831, several researchers and experimenters pursued efficient electro-generation designs capable the 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 several winding) subject to the alternating action of a permanent magnet, obtained by mutual rotation.
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