一种基于转矩角的永磁同步电机直接转矩控制

A Direct Torque Control Strategy Based on Torque Angle for Permanent Magnet Synchronous Motors

针对电动汽车用永磁同步电机,提出一种基于转矩角的直接转矩控制策略,并研究了其中磁链与转矩角的限幅要求。所述方法以电机转矩角控制为出发点,利用转矩闭环调节直接得到所发电压矢量幅值,根据定子磁链闭环调节并结合转矩角前馈调整所发电压矢量角度,并通过空间矢量调制得到驱动信号,同时对转矩角实时观测和限制,以保证电机稳定运行。该方法不仅具有对电感参数变化不敏感和鲁棒性较强的优点,而且控制结构简单。实验结果表明该方法有效、可行。

A novel direct torque control（DTC） strategy based on torque angle is introduced in the paper for the permanent magnet synchronous motors（PMSMs） used in electric vehicles. The limits of flux linkage and torque angle are also discussed in the paper. The proposed strategy is based on torque-angle control, and the amplitude and angle of output voltage vector are directly determined by torque and flux linkage close-loop regulators respectively. The output voltage vector is synthetized by space vector modulation（SVM）. Real time observation of torque angle ensures motor working on the stable operation range. Besides, the strategy with simple structure is unaffected by the change of inductance parameters. Experiment results show that the proposed strategy has good suitability and strong robusticity.