Detection of Mechanical anomaly in Induction Motor

Abstract

The induction motor is used in various industries for the various applications. Because of its cost, reliability, simplicity, robustness, and efficiency, it is used in a variety of industries. 60% of the motors used in industry are induction motors. Any asymmetry that presents or develops in an induction motor might result in electrical or mechanical fault. An investigation of the induction motor is required to determine the cause of the failure. Mechanical failures related to bearings, stator winding, rotor, and eccentricity are the most common types of mechanical failures in induction motors. These faults are interdependent, which means that one fault leads to another. If it is not identified at an initial stage, it might lead to catastrophic failure and, as a result, an undesirable interruption. Faults in three phase induction motors resulted in production loss, maintenance costs and induction machine replacement costs. To avoid this, defects must be diagnosed accurately and at an early stage. There are various mechanical fault detection methods, i.e., thermal analysis, vibration analysis, current signature analysis, partial power analysis, and frequency response analysis. The limitation of the vibration analysis method and motor current signature method is that it required a very accurate device, and extraction of data from signature is complicated algorithm. Frequency response analysis (FRA) is a powerful method for detecting abnormal conditions in transformer that is used all over the world. FRA is most commonly used in transformers to detect core related problem and winding fault. For each machine has a unique frequency responses. The occurrence of faults in the equipment causes a change in the frequency response. The type of issue and its severity can be determined by comparing the frequency response of a healthy machine to that of a faulty one. The working principle of transformer and induction motor are almost same. As a result, frequency response analysis method is used for induction machine. The frequency response analysis technique will be used to discover mechanical problems in induction motors in this project. The healthy induction motor has its own frequency response. If any faults occurs that will be reflected in the frequency response. The mechanical abnormality of the induction motor will be detected by comparing the frequency response of the defective induction motor with the healthy induction motor.