Vibration Contribution Analysis of Radial and Tangential Electromagnetic Force Harmonic of Permanent Magnet Synchronous Motor

This paper analyzes the vibration contribution of radial and tangential electromagnetic force harmonic of permanent magnet synchronous motor. Firstly, infer the analytical expressions of the air gap magnetic field generated by permanent magnet and armature reaction. Then, the radial and tangential electromagnetic force density produced by different sources are obtained with Maxwell stress theory. After that, the modal shapes and frequencies of the prototype are studied by means of finite element analysis and experimental modal testing. At last, the vibration contribution of radial and tangential electromagnetic force harmonic of the prototype is analyzed quantitatively by harmonic response simulation and experiment. The research demonstrates that in the motor design stage, if the vibration performance is the primary characteristic to be concerned, the contribution of the tangential force needs to be taken seriously.