A detailed transient model of Interior Permanent Magnet motor accounting for saturation under stator turn fault

Abstract

The development of an accurate transient model of Interior Permanent Magnet (IPM) motor with stator turn fault with due account of magnetic saturation is essential to evaluate drive controller performance and stability under fault conditions, and to develop robust and sensitive inter-turn fault detection algorithms. The paper proposes a new semi-analytical model of IPM motor under stator winding inter-turn fault conditions. The model uses dq flux-linkage map of the healthy IPM motor derived from Finite Element (FE) model, and combines it with analytical equations of turn fault motor in the dq frame, to derive transient model for the motor with stator turn fault. Simulation results derived from the proposed fault model are compared against FE results of the turn faulted IPM motor. It is shown that the proposed model predicts with much better accuracy the peak currents and current wave shape when compared to the current state-of-art transient models.