In the middle of 1879, the company Siemens and Halske presented the first electric locomotive in Berlin at an industrial fair, with an average power of 2 KW. It had a DC motor, which had advantages over the water wheel, animal power, and steam engine. However, due to its high manufacturing cost and its vulnerability due to the commutator, these factors led several scientists to focus on the design of an electric motor that was cheaper, stronger and easier to maintain.
In 1885, electrical engineer Galileo Ferraris sketched a two-phase alternating current motor, and although he invented the rotating field motor, he concluded incorrectly that motors designed in accordance with this principle could yield a maximum efficiency 50% in relation to the power consumed.
Among the researchers involved with this idea are the Yugoslavian Nikola Tesla, the Italian Galileo Ferraris and the Russian Michael von Dolivo-Dobrovolski. Their efforts were not limited only to the refinement of the direct current motor, but also to alternating current systems, where the advantages were already known in 1881.