Zhang Z., Ma H., Huang J., Qiu H., 2015, Affect on Permanent Magnet Synchronous Machine Parameters with Asymmetrical Power Voltage, Chemical Engineering Transactions, 46, 1033-1038.
Three phase power asymmetry caused by various reasons results in permanent magnet synchronous motor (PMSM) asymmetry running. The simulation model is established based on finite element analysis (FEA) software in order to analyze PMSM’s various operation performance parameters both normal condition and asymmetry condition caused by single-phase power voltage sag, and the experimental and simulation results show that the relationship between output torque and power voltage sag is linear, and the output torque fluctuation is raised with aggravation of power asymmetry level; it is take a long time to make the PMSM run in steady state; the current of fault phase is degraded, and the fluctuation is raised, and the third harmonic of the fault phase is raised so significant compared with normal condition that it can be as a feature for fault diagnosis; the flux linkage of three phases is no remarkable change and the flux linkage of the fault phase has a little more obvious change than the other two phase; the PMSM output torque contains harmonic components caused by negative sequence component, and these results of the paper can provide the basis for catching fault character and regaining healthy operation as fast as possible.
