Inventions & Experiments
of Nikola Tesla
Mikhail Dolivo-Dobrovolsky (1862-1919)
Mikhail Osipovich Dolivo-Dobrovolsky (January 2, 1862 in Gatchina near Saint Petersburg — November 15, 1919 in Heidelberg, Germany), was a 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 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.
Dobrovolsky, age 22
One of the founders (as Nikola Tesla) 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.
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.
Patents (Comming soon):
- US427978 A - Alternating current motor - May 13, 1890.
- US787027 A - Monophase and poliphase alternating current machine - filed on May 18, 1903 and granted on Apr 11, 1905.
- US503038 A - Regulation of alternating current motors - presented on 23 Dic 1890 and granted on 8 Ago 1893.
- US540153 A -Apparatus for determining diferences between phases of two electric alternating currents - Filed on Oct 27, 1893 and granted on May 28, 1895.
- US469515 A - Electric machine - Filed on Aug 3, 1891 and granted on Feb 23, 1892
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