This paper is studied for the noise and vibration characteristics of a three-phase induction AC motor of an electrical forklift. In addition, structural modifications are presented for reduction of the noise and vibration in induction motor. In order to analyze these characteristics, both the mechanical and electrical properties of the motor are investigated. In the mechanical side of the motor, the dynamic characteristics of the rotor and stator are studied and the support condition of the rotor and a sound radiation are also considered. In the electronical side, harmonic components of the magnetic motive force (mmf) are investigated with relation to the slot numbers of the rotor and stator and a pole number of the motor. Finally we investigated an overall noise and vibration of the induction motor by relations between the electronically harmonic and the mechanical resonance of the stator. By the analysis of the generally three-phase induction motor, we suggest the design methodology to low noise and vibration.
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