Practical rotating AC induction motors were independently invented by Galileo Ferraris and Nikola Tesla, a working motor model having been demonstrated by the former in 1885 and by the latter in 1887.
The three-phase system was independently invented by Galileo Ferraris, Mikhail Dolivo-Dobrovolsky and Nikola Tesla in the late 1880s.
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Born in Turin into an upper-middle-class family, Sinigaglia knew the leading figures of thought, arts and science that lived in the city at the time, such as Galileo Ferraris, Cesare Lombroso, and Leonardo Bistolfi.
The discovery of the rotating magnetic field is generally attributed to two inventors, the Italian physicist and electrical engineer Galileo Ferraris, and the Austrian/Serbian inventor and electrical engineer Nikola Tesla.