具有切向磁钢的无刷直流电动机电枢反应对最佳换向位置影响的分析

Analysis of Armature Reaction Influence on the Optimum Commutation of Tangential-set Magnet BLDCM Based on Finite Element Simulation

建立了1台用于航空起动发电系统地面实验30 kW切向磁钢无刷直流电机BLDCM的有限元仿真模型。论述了实验电机系统工作在120°电角度导通方式时,理想状态下的最佳控制逻辑。利用有限元模型研究了电枢反应对电机气隙磁场和最佳换向位置的影响,并且结合对有限元仿真结果的计算分析,研究了实验电机电磁转矩及其脉动随电枢电流变化的情况。理论与仿真结果表明:电机通入电枢电流后,最佳换向位置发生变化。当电枢电流较大时,不能忽略电枢反应对最佳换向位置的影响,需要对变换器换向位置角进行调整来适应电枢电流的变化,以获得最大输出转矩和较优的转矩脉动性能。

Finite element model of 30 kW tangential-set magnet BLDCM used for aero start/generating experimentation system is founded on ANSYS. Optimum control logic is discussed when the experimentation motor ideally operates in 120 electrical degrees active. Armature reaction influence on magnetic field of motor in air-gap and optimum commutation position are studied using FE model. Variety of Torque and according to calculate and analysis the results of FE simulation. The results of theory and simulation show that optimum commutation position of motor will move when current of armature is changed, when armature current is fairly high, armature reaction influence on optimum commutation position can not be ignored. And commutation position of inverter must be adjusted according to the value of armature current. It＇s beneficial for the motor to provide most torque and less torque ripple.