基于双平面同步旋转变换的五相感应电机气隙磁场间接矢量控制

Indirect Vector Control for Air-gap Magnetic Field of Five-phase Induction Motor Through Dual-plane Synchronized Rotation Transformation

在五相集中整距绕组感应电机系统中,通过注入特定3次谐波电流,可以减小电机气隙磁密幅值,从而减小电机铁磁饱和度,提高电机铁磁材料利用率与转矩密度。该文建立了五相集中整距绕组感应电机在d1-q1-d3-q3坐标系下的矢量控制数学模型;为了满足准方波气隙磁场的控制要求,分析了气隙磁链基波与3次谐波分量之间的关系,建立了3次谐波电流交轴、直轴分量与基波之间的非线性函数关系表达式。在此基础上,提出了通过注入3次谐波电流来改善感应电机气隙磁场的控制方法,并应用该方法对一台5.5 kW五相集中整距绕组感应电机进行了Matlab/Simulink仿真和实验。结果表明,该方法满足电机气隙磁场为准方波的控制要求,采用该方法后系统具有良好的运行性能。

In five-phase concentrated full-pitch windings induction motor system, by injecting the special third harmonic current for a quasi-square air-gap magnetic field, the ferromagnetic saturation can be reduced, and the utilization ration of motor＇s ferromagnetic material and torque density can get improved. In this paper, the vector control mathematic model of five-phase concentrated full-pitch windings induction motor in dt-q^-d3-q3 coordinate system is built. To satis .fy the requirement of a quasi-square air-gap flux, the relationship between the fundamental and third harmonic component of the air-gap flux linkage is analyzed, and the direct and quadrature current components in the third harmonic plane as non-linear functions of the fundamental are calculated. On the basis above, the third harmonic current injected method to improve the motor＇s air-gap magnetic field is proposed. Finally, simulation by Matlab/Simulink and experiment is implanted on a 5.5 kW, five-phase concentrated full-pitch windings induction motor. The results indicate that the proposed method can not only satisfy the requirement of a quasi-square air-gap flux, but also make the motor system good operation performance.