无刷直流电机直接转矩模糊控制研究

Study of the Fuzzy Control on Direct Torque Control for BLDCM

为简化无刷直流电机控制系统的结构同时又能使其具有较快的转矩响应速度,论文提出一种新颖的控制方案,将直接转矩控制和模糊控制相结合应用于无刷直流电机控制系统中。直接转矩控制省掉了复杂的矢量变换,使系统结构简单且响应迅速,但是转矩脉动相对较大;而模糊控制鲁棒性强,根据转矩偏差和转矩偏差的变化率,模糊调节电压矢量作用时间,减小转矩脉动。新型的控制策略不仅具有良好的动态特性和简单的结构,其它性能也可与传统的无刷直流电机控制系统相媲美。利用MATLAB对系统进行了仿真,并对两种不同控制方法的实验结果进行比较。通过比较可以看到模糊直接转矩控制方法实现了对转矩和电流的有效控制,更优于传统的控制方法。

In order to improve the response speed of brushless DC motor （BLDCM） control system and simplify its structure, a novel scheme is proposed in this paper. Direct torque control （DTC） scheme and fuzzy control strategy are combined in the new scheme. DTC has the advantage of fast response and simple system structure. However, its torque ripple is relatively high. The robustness of fuzzy control strategy can appropriately compensate the deficiency of DTC mentioned above. According to the error between torque and its reference value and the error variance ratio, the active time of space voltage vector can be solved by fuzzy logic to reduce torque ripple. The proposed control system not only shows good transient performance and a simple architecture, but also comparable with traditional control method in other aspects. A simulation with MATLAB was done to draw a comparison between the proposed control system and ordinary systems. Finally, the simulation and experimental results prove that the fuzzy DTC method makes effective control on torque and current, and it offers more excellent steady and transient performance than traditional methods.