应用网络拓扑法计算低惯量稀土永磁伺服电动机的磁场

通过理论分析，首次将网络拓扑法的应用范围从无旋场扩大到有旋场的计算中，从而进一步发展和完善了这一数值计算方法。本文从麦克斯韦方程出发，通过对比热传导问题的约束方程，导出了网络拓扑法用于有旋电磁场计算的离散化格式。继而通过与相应的有限单元法的比较，说明了网络拓扑法的一系列优点。同时，本文还分析建立了适合有旋场计算的永磁体等效电流模型。作为实例，本文最后给出了一台低惯量稀土永磁伺服电动机的求解方程，并计算了空载磁场及电枢反应磁场分布，由此得到的电机电磁参数，不仅为伺服电动机本身而且为整个伺服控制系统的设计提供了依据。

Application of Network Topological Method to the Calculation of Magnetic Fields in Low Inertia REPM Servo-Motor

The Network Topological Method has been used to calculate rotational magnetic fields for the first time,and thus,the numerical method has further been developed and improved. By directly deducing from Maxwell's equations,the discretized calculation formulation has been set up after analogizing the governing equations for heat conduction problems. In Comparison with FEM,the advantages of Network Topological Method are obtained. Also in this paper the current model of PM has been described to suit rotational field analysis. Finally,as an example,a low inertia rare-earth PM servo-motor is analysed,and the electromagnetic parameters obtained from field calculation are helpful to both motor design and the simplification and optimization of the control system.