Running state monitoring of induction motor windings using near infra red sensor and Q factor analysis

Abstract

Electrical, thermal, mechanical, and electromagnetic stress on induction motor damages the insulation of stator and rotor windings. A voltage fluctuation is the major reason for electrical stress. Overloading in motor leads to thermal stress and affects end ring and rotor bars. Thermal stress in motor causes rotor bar fault and axial misalignment of rotor. Misaligned rotors cause winding faults, mechanical vibration, and reduce stator-rotor air gap. Misaligned rotor, and motor bearings faults cause mechanical stress. Unbalanced rotor and transient torque causes electromagnetic fault. The above Stress damages stator, rotor, winding and insulation. Damaged stator and rotor insulation motor increases the temperature. High Rotor thermal stress degrades and burns the insulation region in stator and rotor or motor. Turn-to-turn faults are due to rotor windings faults. Turn-to-turn fault increases fault current, thermal stress, and stator, rotor winding temperature. All winding faults such as Single-phase winding phase-to-phase shorts, and different-phase winding leads to phase-toground faults in induction motor, causes heat in insulation and windings of stator and rotor. Inter-turn insulation, stator and rotor winding faults, if not detected in time, causes rotor bend and coil burning. Rotor bar breaking and stator winding inter-turn short circuit fault occurs simultaneously and need continuous monitoring to prevent the burning in motor. Rotor winding fault and stator winding and insulation fault often occurs in induction motor. newline