Keunsoo Ha Rae-Young Kim Ramu Krishnan Position Estimation in Switched Reluctance Motor Drives Using the First Switching Harmonics Through Fourier Series. 5352-5360 2011 58 IEEE Trans. Ind. Electron. 12 https://doi.org/10.1109/TIE.2011.2130495 db/journals/tie/tie58.html#HaKR11