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Electrical machines are one of the main equipments in industry. Permanent Magnet Synchronous Motors (PMSM) is a useful electrical machine in industry, especially high power density of such motors is one of their important advantages in comparison with other kind of electrical machines. Different kinds of faults are unavoidable in such motors, same as other electrical equipments. Among expected faults, electrical fault and especially inter-turn stator winding fault is a harmful faults, in PMSM and other electrical motors. So far, different methods and patterns have been presented to detect this fault, in literature. Choosing proper and effective patterns can lead to better illustration of motor's behavior under fault condition. In this paper, magnitude of reactive power has been introduced to detect inter-turn fault in stator's windings. Obtained results show that introduced pattern can show behavior of PMSM under inter-turn fault, perfectly and can be an excellent choice for detecting such faults.