Table 2: The vibration frequency spectrum component analysis of inner and outer rotor.

Frequency (Hz) (inner rotor)ComponentFrequency (Hz) (outer rotor)Component

18.3118.31
141.6141.6
195.3159.9
213.6195.3
231.6213.6
250.2231.6
281.1250.2
266.1
284.4