Influence of temperature on partial demagnetization of the permanent magnets during starting process of line start permanent magnet synchronous motor

The paper presents a 2D field-circuit model of coupled electromagnetic thermal and mechanical phenomena in a line start permanent magnet synchronous motor (LSPMSM). The nonlinearity of the magnetic circuit, the influence of temperature on magnetic properties of the permanent magnets as well as on electric and thermal properties of the materials have been taken into account. The elaborated on the basis of this model algorithm as well as a developed computer program have been used to analyze the influence of temperature and armature reaction on the magnet stabilization during the starting process of the considered motor. The selected results of simulations have been presented and discussed.