感应电机弱磁区最大转矩输出的控制策略研究

Research on Control Strategy for Maximum Torque Operation of an Induction Machine in the Field-weakening Region

针对感应电机采用传统弱磁方法不能实现最大转矩输出,提出了一种全速度范围实现最大转矩输出的电流优化分配控制策略。首先,以最大转矩输出为目标,对电压、电流进行合理分配,得出了理论的最优电流分配原则;然后,以电机运行的实际状态与理论分配相结合,提出了一种电流优化的控制策略;最终,将该方法用于矢量控制系统中,实现了全速度范围的最大转矩输出控制。通过仿真和实验结果证明,该方法可靠、有效且动态响应性能良好。

In the traditional field-weakening methods,it can't achieve maximum torque output.In order to solve this problem,a novel approach for the induction machine control which ensured producing maximum torque over the entire field-weakening region was presented.First,considering voltage ratings of the power inverter and the current constraint of the induction machine,the optimal current vector locus for maximum torque operation was derived by mathematical method.Then,following the design guidelines,an alternative control algorithm was developed for the implementation.Finally,the method was applied to the vector control system,and the maximum torque output control of the full speed range was realized.The simulation results show that the method is reliable,effective and has good dynamic response performance.