M. S. Rafaq and J. W. Jung, “A comprehensive review of state-of-the art parameter estimation techniques for permanent magnet synchronous motors in wide speed range,” IEEE Trans. Ind. Inform., vol. 16, no. 7, pp. 4747-4758, Jul. 2020. DOI:10.1109/TII.2019.2944413

S. Morimoto, K. Kawamoto, M. Sanada and Y. Takeda, “Sensorless control strategy for salient-pole PMSM based on extended EMF in rotating reference frame,” IEEE Trans. Ind. Application, vol. 38, no. 4, pp. 1054-1061, Jul. 2002. DOI:10.1109/IAS.2001.955991

J. H. Jang, S. K. Sul, J. I. Ha, K. Ide and M. Sawamura, “Sensorless drive of surface-mounted permanent-magnet motor by high-frequency signal injection based on magnetic saliency,” IEEE Trans. Ind. Appl., vol. 39, no. 4, pp. 1031-1039, Jul./Aug. 2003. DOI:10.1109/TIA.2003.813734

L. Harnefors and H.-P. Nee, “A general algorithm for speed and position estimation of AC motors,” IEEE Trans. Ind. Elec., vol. 47, no. 1, pp. 77-83, Feb. 2000. DOI:10.1109/41.824128

O. Wallmark, L. Harnefors and O. Carlson, “An improved speed and position estimator for salient permanent-magnet synchronous motors,” IEEE Trans. Power Electron., vol. 52, no. 1, pp. 255-262, Feb. 2005. DOI:10.1109/TIE.2004.841088

Z. Chen, M. Tomita, S. Doki and S. Okuma, “An extended electromotive force model for sensorless control of interior permanent magnet synchronous motors,” IEEE Trans. Ind. Electron., vol. 50, no. 2, pp. 288-295, Apr. 2003. DOI:10.1109/TIE.2003.809391

H. Kim, M. C. Harke and R. D. Lorenz, “Sensorless control of interior permanent-magnet machine drives with zero-phase lag position estimation,” IEEE Trans. Ind. Appl., vol. 39, no. 6, pp. 1726-1733, Nov./Dec. 2003. DOI:10.1109/TIA.2003.818966

O. Wallmark and L. Harnefors, “Sensorless control of salient PMSM drives in the transition region,” IEEE Trans. Ind. Electron., vol. 53, no. 4, pp. 1179-1187, Jun. 2006. DOI:10.1109/TIE.2006.878315

R. W. Hejny and R. D. Lorenz, “Evaluating the practical low-speed limits for back-EMF tracking-based sensorless speed control using drive stiffness as a key metric,” IEEE Trans. on Ind. Appl., vol. 47, no. 3, pp. 1337-1343, May/Jun. 2011. DOI:10.1109/TIA.2011.2126013

A. Piippo, M. Hinkkanen, and J. Luomi, “Analysis of an adaptive observer for sensorless control of interior permanent magnet synchronous motors,” IEEE Trans. Ind. Electron., vol. 55, no. 2, pp. 570-576, Feb. 2008. DOI:10.1109/TIE.2007.911949

D. Lee and K. Akatsu, “The study on gain selecting method of position sensorless control algorithm for IPMSM,” in Proc. IEEE 12th Int. Conf. Power Electron. Drive Syst., pp. 728-733, 2017. DOI:10.1109/PEDS.2017.8289269

D. Lee and K. Akatsu, “An improved speed and position estimator for transient performance of back-EMF self-sensing for IPMSM,” in Proc. 44th Annu. Conf. IEEE Ind. Electron. Soc., pp. 397-402, Oct. 2018. DOI:10.1109/IECON.2018.8591825