Fequencies an Modes of Electromagnetic Vibration of a Small Induction Motor

Abstract

Three-phase small squirrel cage induction motors have been used in a variety of industries for many years. Reduction of vibration and noise caused by electromagnetic forces has been recently urged due to environmental concerns.Vibration is produced by a deformed stator core caused due to electromagnetic force. The relationship between the shape of the deformed stator core, the wave of electromagnetic force and the natural frequency of the stator core was numerically analysed and compared with measured results.
First, the motor's natural frequencies and modes were analysed through FEM analysis and experiments. Next, the induction motor vibration due to various electromagnetic forces was analysed using FEM and was measured. From these analyses and experiments, it was confirmed that the mode of electromagnetic vibration was dependent on the mode of a nearby natural frequency.