Frequency-domain analysis of electromagnetic torque ripple excited vibration of high-speed generator coupled helium turbine expander rotor.

The present work attempts to obtain the continuous spectrum of electromagnetic torque ripple exciting vibration response of a surface-mounted permanent magnet generator coupled helium turbine expander rotor. By establishing a simplified rotor vibration model, frequency domain analysis of electromagnetic torque ripple exciting rotor vibration is carried out, and the blade vibration response spectrum is obtained, which is in good agreement with the single-frequency response calculation. The results show that the blade vibration is more obvious to the high frequency components of the electromagnetic torque ripple, and the influence of the non-harmonic noise component of the electromagnetic torque on the blade vibration cannot be ignored.