Noise and Vibration Prediction of a Six-Phase IPMSM in a Single Open-Phase Failure Under a Negative Sequence Current Compensated Fault Tolerant Control Mode

Due to a multiphase configuration, six-phase interior permanent magnet synchronous machines (IPMSMs) exhibit the inherent reliability and fault-tolerant capabilities. Using a fault-tolerant control (FTC) method, the machine is still able to deliver the desired torque under the open-phase fault with a potential degradation in its efficiency and vibration behavior. The vibroacoustic characteristics of the IPMSM under the faulty operation during the FTC mode have not been studied in the literature. To fill this knowledge gap, the simulation and experiment-based noise and vibration (NV) analysis of a six-phase IPMSM in a single open-phase condition using a negative sequence current-compensated FTC mode is studied in this article. First, the whole procedure of the NV analysis for the IPMSM model is introduced. The calculation of the electromagnetic (EM) force is then studied to explore the main excitation of the vibration in the system. After this, the NV synthesis is carried out and the simulation results of the NV under a negative sequence current-compensated FTC mode are obtained. It is found that the 28th order of the flux density spatial harmonics component influences vibration the most. Finally, the NV predictions in both healthy mode and controlled faulty mode are verified by experiments.