5Pillay P,Krishnan R. Modeling of permanent magnet motor drives [J ]. IEEE Trans on Industrial Electronics, 1988.35 (4) : 537- 541.
6Rahman M A,Vilathgamuwa M,Uddin M N, et al.Nonlinear control of interior permanent-magnet synchronous motor [J]. IEEE Trans on Industrial Application, 2003,39 (2): 408- 416.
7Kokotovic P. The joy of feedback: nonlinear and adaptive [J]. IEEE Control System Magzine, 1992,12(3):7-17.
