MSCP based Rotor Faults and Mechanical Bearing Failure Identification in Induction Motor using Power Quality Analyzer

The efficiency of a machine is determined by how it converts energy. Energy converting machines are mostly electrically powered. Induction motors are used to drive loads in heavy applications because of their efficient energy conversion at low cost. As the load increases, excess heat is generated in the magnetic circuit of the induction motor. Due to this excess heat energy, the copper bars in the rotating parts of the polyphase induction motor expand. As the load decreases, the amount of current that can flow through the rotating part decreases and so does the heat. So the copper bars regain their old condition. Due to this alternating stretching and narrowing, the copper bars are cut at one point. This affects the power conversion and also affects the efficiency of the induction motor. If such faulty conditions are not detected and solved immediately, they can eventually damage the entire motor. This research paper describes types of faults in the rotor circuit and their impact on the threephase current flowing in the stator. Also bearing faults and their impact are described here. Motor Stator Current Profile (MSCP) method is used to point out the rotor faults in the machine.