Thermal analysis using equivalent thermal network in IPMSM

This paper deals with temperature calculation using equivalent thermal network in interior permanent magnet synchronous motor (IPMSM) under the steady-state condition. The equivalent thermal network consists of heat sources, which are generated from copper loss and iron loss, and thermal resistances considering conduction and convection. The heat transfer coefficient in conduction is decided by material property but it has some disagreement between the value using numerical formula and experimental results. Therefore, temperature of each part in IPMSM is calculated by the equivalent thermal network using calculated thermal resistance based on experimental results. Finally, validation and reliability for proposed equivalent thermal network are verified by experimental results.