基于绕组温度约束的永磁同步电机裂比优化方法（英文）

Split Ratio Optimization for Permanent Magnet Synchronous Machines Considering Winding Temperature Limitation

裂比是一个影响永磁同步电机转矩和效率的重要参数。该文提出一种基于绕组温度约束的永磁同步电机裂比优化方法。裂比优化中典型的热约束条件是电机所允许的最大铜耗或电流密度,然而,定子的齿、轭和绕组尺寸会随着裂比的改变而改变,导致电机的导热能力发生变化,因此典型的热约束条件难以限制绕组温度在同一水平。为此,该文通过搭建热阻网络,将绕组温升限制直接作为裂比优化的热约束条件。为提高热网络计算精度,提出基于热源位置的热阻分类方法。通过有限元分析和5 kW样机温升实验,验证了提出的裂比优化模型的有效性。

The split ratio is a significant parameter which affects the torque and efficiency of permanent magnet synchronous machines (PMSM). This paper proposes a split ratio optimization model for PMSM considering winding temperature limitation. The typical thermal constraints of the split ratio optimization are the fixed maximum copper loss and current density allowed. However, as the heat conductivity of the machine changes with the split ratio due to the variable dimensions of the slots, teeth and yoke, the typical thermal constraints are difficult to limit the winding temperature at the same level. To solve this problem, the winding temperature limitation was taken as the thermal constraint directly in this paper based on the thermal resistance network (TRN). To improve thermal analytical accuracy, the thermal resistance classification according to the heat source type was proposed. The effectiveness of the proposed optimization model is verified by finite element analysis (FEA) and experiment of a 5 kW prototype machine.