Analysis of inductance variation in permanent magnet linear synchronous motor

On the basis of a new non-linear magnetic circuit analytic model, the inductance of Permanent Magnetic Linear Synchronous Machine (PMLSM) has been calculated in this paper. The impact of magnetic saturation has been significantly considered in this model. So the dynamic inductance is obtained as a function of magnet position and current. Meanwhile, it also presents the fundamental reasons about the inequality of stable inductance of the three-phase winding by analysis of the asymmetric magnetic circuit. The proposed method is verified by finite-element method and experiments.