6Tsuji T, Mizuochi M, Nishi H, et al. A velocity measurement method for acceleration control[C]. 31st Industrial Electronics Society Annual Conference of IEEE, 2005: 1943-1948.
7Yueheng B, Xiaoqi T, Jihong C, et al. Research on ultra-low speed control of PMSM in servo systemiC]. 7th World Congress on Intelligent Control and Automation, 2008: 2381-2386.
8Wang Gaolin, Xu Dianguo, Yu Yong, et al. Low Speed control of permanent magnet synchronous motor based on instantaneous speed estimation[C]. The Sixth World Congress on Intelligent Control and Automation, 2006, 2: 8033-8036.
9Lee Se Han, Song Jae Bok. Acceleration estimator for low-velocity and low-acceleration regions based on encoder position data[J]. IEEE/ASME Transactions on Mechatronics, 2001, 6(1): 58-64.
10Song Seung Ho, Sul Seung Ki. An instantaneous speed observer for low speed control of AC machine[C]. Proceedings of Thirteenth Annual Conference on Applied Power Electronics Conference and Exposition, 1998, 2: 581-586.