Direct torque control uses the pure integral voltage model for torque observation. The problems of accumulate error and direct current excursions will cause the fluctuations of current and torque. A modified model of flux observation is put forward.

• 针对传统的直接转矩控制系统采用纯积分的电压模型作为磁链观测器；存在着误差积累以及直流偏移；导致电流和转矩的波动问题；提出了一种改进的磁链观测器；该观测器由两个模型组成；开环电流模型用于低速范围内观测磁链；自适应电压模型用于全速范围内观测磁链.