An Equivalent Magnetic Circuit Model of PMSM Demagnetization Fault

Abstract

The PMSM (permanent magnet synchronous motor) demagnetization fault simulation model and the equivalent magnetic circuit model under normal operation were established, and the calculation method of each parameter on the equivalent magnetic circuit model was analyzed. Then the demagnetization factor that represents the demagnetization severity was introduced, and the calculation method of parameter under the fault condition of the PMSM was deduced, and the air gap flux densities of the PMSM under different working conditions were calculated. At last, the validity of this model was verified by comparing the results of the partial demagnetization simulation and the equivalent magnetic circuit model.