Hysteresis Loss in NdFeB Permanent Magnets in a Permanent Magnet Synchronous Machine

Most permanent magnet (PM) loss studies consider only eddy current and neglect hysteresis. In this article, the hysteresis behavior of two NdFeB PM grades with different magnetic properties is assessed when applied in a PMSM. Data from vibrating sample magnetometer measurements modeling are used as base. addition to main phase, samples contained phases reduced coercivity. Such may contribute losses material. A new model introduced simulate rare-earth magnets any geometric shape second first quadrants intrinsic BH -plane. The field strength distribution material an electrical motor analyzed by two-dimensional finite-element method. results input data for analytical model. indicate that resulting structural imperfections geometry introduce considerable PMs rotating machines.