IEEE TRANSACTIONS ON MAGNETICS, VOL. 36, NO. 4, JULY 2000 Gyu-Hong Kang, Jung-Pyo Hong, Member, IEEE, Gyu-Tak Kim, and Jung-Woo Park Abstract—This paper presents an investigation of the parameter modeling on the basis of an improved Finite Element (FE) analysis in which the variable frequency characteristic in field weakening is considered in Interior Permanent Magnet Synchronous Motors (IPMSM). The parameters of IPMSM have a nonlinear characteristics under variable load conditions and due to the current phase angle in a system fed inverter. From the analysis of FE, a new vector control algorithm is proposed by neural network using a variable inductance estimator. The performances of variable frequency are simulated by using the proposed algorithm, and the validity of the proposed FE analysis is compared with experimental results. Index Terms—Parameter modeling, IPMSM, FE.