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Pat. 10135375 United States, Int. Cl.22 H02P 6/16, H02M 7/5387, H02P 6/14, H02P 21/22, H02P 27/08. Rotation controller for AC electric motor and method for controlling rotation of the AC electric motor : Appl. N 15/461485 : Filed 17.03.2017 : Pub. 20.11.2018 : / Shingo Fukumaru, Keita Shimamoto, Shinya Morimoto ; Assignee Yaskawa Electric Corp ; NN p. : patents.google.com : URL: https://patents.google.com/patent/US10135375/en?oq=US10135375.html (дата обращения: ДД.ММ.ГГГГ).