Abstract: Based on the compressor equipped with a 9-groove 6-pole motor, the problem of shaft vibration and noise related to the number of motor poles was studied. Firstly, the composition of radial electromagnetic force with six times frequency was cleared by analyzing the electromagnetic force of motor. Secondly, the vibration characteristics of the rotating shaft was analyzed by simulation and testing analysis, and indicated that the resonance between the six times frequency electromagnetic force and the bending mode of the rotating shaft was the root cause of the vibration and noise of the rotating shaft. Finally, the vibration and noise of the rotating shaft was reduced and the sound quality of the compressor was improved through the simulation analysis and optimization of the bending mode of rotating shaft.

Key words: Rolling piston compressor, Rotating shaft, Pole number of motor, Bending mode, Sound quality