异步电动机直接转矩控制转矩脉动的最小化研究

Study of Torque Ripple Minimization for Direct Torque Control of Induction Motors

在传统的异步电动机直接转矩控制系统中,存在电压空间矢量对定子磁链幅值和磁通角的影响,特别是低速时系统脉动大。针对该问题,提出了一种的新的控制方法,将磁链区间细分控制与电压矢量合成相结合,并且为进一步提高转矩响应和减小转矩脉动,引入了模糊控制。仿真结果表明该控制方法可以大大减小转矩脉动,具有较好的动静态性能。

Considering the influence of voltage space vector on the magnitude of stator flux and the flux angle in the conventional direct torque control for induction motors especially large tipples at low speed, a new control strategy was presented in this paper. This strategy combined flux linkage section subdivide control with synthesizing vectors which can reduce torque ripples effectively. Fuzzy control was also introduced to improve torque response and decrease torque tipples. Simula- tion results show that a great reduction of torque ripples is achieved and the strategy has a better dynamic and steady performanee.