双凸极无刷直流发电机的非线性数学模型

用变网络等效磁路法建立电励磁双凸极发电机等效磁路模型。在考虑磁路饱和、电枢磁场和励磁磁场相互作用的基础上 ,给出了描述该发电机非线性电感的函数 ,函数值与转子位置、各相电枢电流和励磁电流有关。有限元法验证了该函数的计算结果具有很高精度。在基于电感数值解基础上建立了该无刷直流发电机负载时一个工作模态非线性数学模型 ,给出了描述该数学模型的微分方程。理论计算结果和样机实验结果对比验证了该模型的正确性 ,为研究双凸极发电机的工作性能提供理论依据

A Nonlinear Mathematical Model of the Doubly Salient Brushless DC Generator

A nonlinear varying network magnetic circuit(VNEMC) modeling method is developed for doubly salient generators and a nonlinear function of the inductances is established,in which the interaction between the exciting current field and the armature current field,as well as magnetic saturation are taken into account.The value of the function is determined by the rotor position,armature current of each phase and the exciting current.There is a good agreement between the results calculated by VNEMC method and finite element method(FEM).Based on the numerical solutions of the inductances,a nonlinear mathematical model is given on an operating stage with a load.The mathematical model is verified by the comparison between experimental results and the simulation results.The mathematic model contributes a lot to the analysis of the performance of the generator.