Joint detection of stator winding inter-turn short circuit and rotor bar breaking fault in squirrel cage induction motors

The stator winding inter-turn short and rotor bar breaking are both frequent faults in squirrel cage induction motors. The previous work is inclined to detect one single fault, in other words, to detect the stator winding inter-turn short circuit or rotor bar breaking fault, separately. Hence there exists the misdetection probability due to the inter-influence of them. To solve that problem, this paper addresses the joint detection of the two faults. Firstly, this paper completes the numerical simulation by utilizing the multi-loop mathematical model. Secondly, some creative and interesting conclusions, which depict explicitly the inter-influence of the stator winding inter-turn short and rotor bar breaking faults, have been drawn based on the thorough analysis of the simulation results. Finally, a series of tests verify the necessity and effectiveness of the joint detection, which reduces the misdetection probability to a great extent. Further work will focus on refining the joint detection and applying it to the industrial site.