Improving the Reliability in PMSM for Wind Turbine

The wind turbine converts the wind energy into electrical energy, wherein the electrical machines are coupled with wind turbines for this conversion. The electrical machines are liable to meet with faults, but to regain the system reliability the faults should be detected earlier. According to studies of electrical power research institute (EPRI) most of the faults in electrical motors are created in bushes (41%) and winding (37%).Since there is increased probability of winding fault in motors, its fault diagnosis is very important. The fault often occurs with winding isolators. Inter-turn winding fault creates short circuit in phase winding and changes the phase impedance thereby the machine becomes unbalanced. Rate of impedance reduction depends on the intensity of the fault. To diagnosis winding fault approaches based on frequency analysis are studied, MCSA is used to determine the fault in the stator winding.