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Pat. 9960723 United States, Int. Cl.22 H02M 1/14, H02M 1/12, H02M 7/217, H02P 27/06, H02M 1/00. Motor drive with resonance detection and impedance computation : Appl. N 15/173767 : Filed 06.06.2016 : Pub. 01.05.2018 : / Shaofeng Zhang, Haihui Lu, Yogesh P. Patel, Ahmed Mohamed Sayed Ahmed, Lixiang Wei, Richard Lukaszewski ; Assignee Rockwell Automation Technologies Inc ; NN p. : patents.google.com : URL: https://patents.google.com/patent/US9960723/en?oq=US9960723.html (дата обращения: ДД.ММ.ГГГГ).