A Method for Dynamic Simulation and Detection of Air-gap Eccentricity in Induction Motors by Measuring Flux Density

This paper presents results of the finite-element (FE) analysis and experiment of air-gap flux variation in induction motor when rotor eccentricity conditions occur. An accurate modeling and analysis of rotor vibration in the motor are made using air-gap flux simulation, and search coils are used for measuring the actual magnetic flux. The simulated vibration system with 380 [V], 5 [HP], 1,742 [rpm] induction motor is built, and search coils are designed and inserted under the stator wedge of the motor. FE analysis results are compared with experiment test results