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Pat. 9985566 United States, Int. Cl.22 G05B 11/28, B66B 1/30, H02M 7/493, H02P 25/22, H02P 27/08, H02M 1/12, H02M 1/44. Dual three-phase electrical machine and drive with negligible common-mode noise : Appl. N 15/131543 : Filed 18.04.2016 : Pub. 29.05.2018 : / Dong Jiang ; Assignee Otis Elevator Co ; NN p. : patents.google.com : URL: https://patents.google.com/patent/US9985566/en?oq=US9985566.html (дата обращения: ДД.ММ.ГГГГ).