Most fault detection techniques are focused on induction motors and are based on steady-state conditions. In this paper, an extraction method for inter-turn fault detection in interior permanent magnet synchronous motors (IPMSM) is proposed. The study is focused on an IPMSM under non-stationary conditions. The technique is formulated by modifying existing fixed frequency sinusoid tracking algorithms, which is based on an adaptive algorithm for extracting non-stationary sinusoids. The faults are determined using the motor current signature analysis technique. Simulations performed in this study validate that the proposed algorithm improves the extraction performance. 2 FAULTS AND DETECTION METHOD 2.1 Inter-turn Faults Inter-turn faults are caused by the breakdown of turnto-turn insulation as a result of the voltage, current,