对变频供电下特有的振动噪声源进行了识别，揭示了产生电机高频振动噪声的原因。
The source of noise and vibration of PMSM fed by inverter are identified. Reasons of resulting in noise and vibration in high-frequency was revealed.
运用主成分分析方法，经过矩阵变换，提取振动信号的主要信息，从而实现对振动噪声源的分析。
The main vibration signals can be obtained by reducing its dimensions through matrix conversion in the principal component analyzed, and realize the analysis to the vibration noise source.
与普通电机一样，振动噪声也是永磁电机的一个重要性能指标，因此研究永磁电机的振动噪声源就显得十分有意义。
Like ordinary motors, noise and vibration of PMSM are also important performance indicators. Therefore, it is very meaningful to study noise and vibration source of PMSM.
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