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Mikhail Dolivo-Dobrovolsky
Mikhail Osipovich Dolivo-Dobrovolsky ((ロシア語:Михаи́л О́сипович Доли́во-Доброво́льский); (ドイツ語:Michail von Dolivo-Dobrowolsky) or ''Michail Ossipowitsch Doliwo-Dobrowolski''; (ポーランド語:Michał Doliwo-Dobrowolski); in Gatchina near Saint Petersburg — in Heidelberg, Germany), was a Polish-Russian engineer, electrician, and inventor. Born in a mixed family between a Polish noble family originating from Mazowsze, and a Russian noble family. Emigrated to Germany due to political persecution of Poles after the assassination of Alexander II of Russia (1881). He studied at the Darmstadt University of Technology (TH Darmstadt) in Germany. From 1887 he worked for AEG.
One of the founders (the other two were Nikola Tesla and Galileo Ferraris) of three-phase electrical systems, he developed the three-phase electrical generator and a three-phase electrical motor (1888) and studied star and delta connections. The triumph of the three-phase system was displayed in Europe at the International Electro-Technical Exhibition of 1891, where Dolivo-Dobrovolsky used this system to transmit electric power at the distance of 176 km with 75% efficiency. In 1891 he also created a three-phase transformer and short-circuited (squirrel-cage) induction motor.〔(Woodbank Communications Ltd.'s Electropaedia: "History of Batteries (and other things)" )〕〔 Gerhard Neidhöfer: ''Michael von Dolivo-Dobrowolsky und der Drehstrom. ''Geschichte der Elektrotechnik'' VDE-Buchreihe, Volume 9, VDE VERLAG, Berlin Offenbach, ISBN 978-3-8007-3115-2.〕
He designed the world's first three-phase hydroelectric power plant in 1891. During his life he obtained over 60 patents.
In 1911 he received an honorary doctorate from the TH Darmstadt.
==References==
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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