Библиографическая ссылка на патент
Pat. 10644638 United States, Int. Cl.22 H02P 1/46, H02M 7/48, H02P 6/16, H02P 21/04, H02P 21/18, H02P 25/024, H02P 25/064, H02P 27/06, H02P 29/024. Electric motor system : Appl. N 16/089136 : Filed 31.01.2017 : Pub. 05.05.2020 : / Tomofumi Okubo, Toshio Tomita ; Assignee Hitachi Industrial Equipment Systems Co Ltd ; NN p. : patents.google.com : URL: https://patents.google.com/patent/US10644638/en?oq=US10644638.html (дата обращения: ДД.ММ.ГГГГ).