This paper is focused on stator winding fault detection of a permanent magnet synchronous motor (PMSM). Open phase fault and interturn fault in one phase are considered. Differences between stator resistances are considered as a fault symptom. The estimation of stator resistances is based on Extended Kalman Filter (EKF) with three phase PMSM electrical model. The fault detection method was verified offline on measured experimental data from the PMSM test platform with emulated faults.