Bochao Du Tianxu Zhao Shouliang Han Liwei Song Shumei Cui Sensorless Control Strategy for IPMSM to Reduce Audible Noise by Variable Frequency Current Injection. 1149-1159 2020 67 IEEE Trans. Ind. Electron. 2 https://doi.org/10.1109/TIE.2019.2898621 https://www.wikidata.org/entity/Q128380230 db/journals/tie/tie67.html#DuZHSC20