一种改进的模糊异步电机直接转矩控制的研究

针对传统的直接转矩控制（DTC）产生转矩脉动的问题，在传统直接转矩控制的基础上，引入了模糊逻辑，细分电压矢量的思想，提出了一种低速模糊模型的直接转矩控制．该模型把磁链相位角、磁链误差和转矩误差作为模糊变量，并对其进行模糊分级，以此来优化电压空间矢量的选择，同时以模糊速度调节器取代传统的PID调节器．实验结果表明该方法不仅能够提高转矩响应速度，而且能够有效地解决转矩脉动问题，在低速度范围内具有较好的动静态性能．

Study on an Improved Fuzzy Direct Torque Control of Asynchronous Motor

In view of the torqure ripple caused by the conventional direct torque control in low speed area, a new control nodel is presented in this paper. The fuzzy logic control model in low speed area is given based on Voltage vector subdivison and fuzzy logic control theory. The model applies the phase angle of the flux,the flux error and torque error as input variables and classifies these variables to optimize the choice of voltage space vector, whieh can replace the switch signals given by the Schmitt trigger. Meanwhile, the traditional PID regulatior is replaced by a fuzzy regulator. Simulation results show that this model can not only improve the speed of torque ripple but also solve the problem of torque ripple. As a result,a better dy- namic and steady performance in low speed area is achieved.