公开(公告)号：US11121656B2

公开(公告)日：2021-09-14

申请号：US16667560

申请日：2019-10-29

Applicant: ABB Schweiz AG

Inventor： Omer Ikram UL Haq ,  Luca Peretti

IPC: H02P27/08 ,  H02P21/13 ,  H02P21/18 ,  H02P21/22

Abstract: A method of controlling an electrical machine, wherein the method includes: a) injecting a first voltage waveform (uhx) with a first fundamental frequency into the electrical machine in a first axis of a rotor reference frame, combined with a voltage signal for controlling the electrical machine, b) determining a second axis current component (iqhx) of a second axis of the rotor reference frame, having the first fundamental frequency, generated in response to the injection of the first voltage waveform (uhx), c) controlling based on the second axis current component (iqhx) a second axis voltage component (uqhx) of the second axis, having the first fundamental frequency, to obtain an adjusted second axis voltage component for controlling the second axis current component (iqhx) towards zero, d) feeding back the adjusted second axis voltage component to combine the adjusted second axis voltage component with the voltage signal and the injected first voltage waveform (uhx), and repeating steps b)-d) until the second axis current component is smaller than a threshold value (iqhx), e) determining a differential cross-coupling parameter of the electrical machine based on the second axis voltage component (uqhx) and a first axis current component (idhx) having the first fundamental frequency, when the second axis current component is smaller than the threshold value (iqhx), and g) controlling the electrical machine based on the differential cross-coupling parameter.