油冷内置式永磁同步电机等效热网络建模与温度场分析OA

To achieve accurate prediction of the temperature field and demagnetization risk assessment of oil-cooled interior permanent magnet synchronous motor(IPMSM)under high-speed working condi-tions,a lumped parameter thermal network(LPTN)coupling modeling method was proposed.The per-manent magnet was divided into six surface nodes and one central node to construct a three-dimension-al thermal resistance network;combined with the distribution of the spray-oil cooling circuit,a thermal resistance network was constructed based on the geometric characteristics and convective heat transfer characteristics of different cooling regions,and the overall LPTN model was formed through the cou-pling of each node.And the accuracy of the model was verified through prototype experiments.Based on this model,the motor temperature distribution and thermal response behavior at different speeds under typical operating conditions were analyzed,revealing the intrinsic relationship between the non-uni-form temperature of the permanent magnet and the risk of local demagnetization.