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Paul Boucherot : ウィキペディア英語版 | Paul Boucherot
Paul Boucherot (1869–1943) was an engineer with the Chemins de Fer du Nord (Northern Railway of France). He studied at the elite École supérieure de physique et de chimie industrielles de la ville de Paris (ESPCI)〔( ESPCI ParisTech Alumni 1888 )〕 where he later also taught electrical engineering. He was a pioneer of DC electric power distribution, designed induction motors, and with Georges Claude, built early plants for obtaining thermal energy from the sea. He also contributed to electrical analysis, including the relationship between real and apparent power. ==Asynchronous motors== Boucherot was interested in using polyphase supplies to power asynchronous motors as early as 1894. The squirrel-cage rotor asynchronous motor was invented by Mikhail Dolivo-Dobrovolsky in 1889 and they were being built industrially from 1891. A problem with asynchronous machines is that they are difficult to start. The coupling to the rotor is weak until it gets moving and the current drawn by the motor is high. Boucherot solved this problem with his discovery of the double cage asynchronous motor in 1912. In fact, Dolivo-Dobrovolsky had already invented the double cage all the way back in 1893 but it was long since forgotten.
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