分段式滑模变结构无刷直流电机直接转矩控制  

Direct-torque-control of brushless DC motors based on segmented sliding-mode-variable-structure

作　　者：朱俊杰[1,2] 粟梅[1] 王湘中[2] 马林[2] 

机构地区：[1]中南大学信息科学与工程学院,长沙410083 [2]中南林业科技大学计算机与信息工程学院,长沙410004

出　　处：《仪器仪表学报》2013年第11期2634-2640,共7页Chinese Journal of Scientific Instrument

基　　金：国家863计划(2009AA05Z209);国家自然科学基金(61174125);湖南省自然科学基金(12JJ3042)资助项目

摘　　要：针对无刷直流电机直接转矩控制策略中反电动势获取困难的特点,提出了一种分段式滑模变结构反电动势状态重构的直接转矩控制方法。滑模变结构控制在本质上的不连续开关特性将会引起系统的抖振,指出了滑模变结构控制在实际控制系统中当滑模输入误差在较小范围内时产生抖振的原因,提出了采用分段式滑模变结构状态重构的方法抑制系统抖振并重构反电势。根据电磁转矩与反电势、磁链的关系,采用电压空间矢量的控制方法实现了无刷直流电机的直接转矩控制。由于滑模变结构控制与系统参数变化和外干扰无关,因此滑模变结构控制系统的鲁棒性要比常规的连续系统强。实验结果验证了分段式滑模变结构控制能有效改善系统的抖振问题,并进一步提高了系统的快速性与鲁棒性。Aiming at the difficulty of acquiring back-EMF （electromotive force） information in direct-torque-control （DTC） strategy for brushless DC motor, a DTC method based on back-EMF state reconstruction of segmented sliding- mode-variable-structure （SMVS） is presented. The intrinsic discontinuous switching characteristics of SMVS may lead to system vibration and electromagnetic torque ripple. In this paper, the cause of the system vibration for small input error of SVMS is pointed out and analyzed. Then, a state reconfiguration method based on segmented SMVS is proposed to reconstruct back-EMF and restrain system vibration. According to the relationship between electromagnet- ic torque, back EMF and flux linkage, the vohage-space-vector control scheme is adopted to achieve the DTC of the brushless DC motor. Being irrelevant to the system parameter variation and external disturbance, the segmented slid- ing mode variable structure control system can achieve better robustness than other conventional continuous systems. Simulation results show that the presented method is effective in tackling system vibration, and the system robustness and fastness are also improved.

关 键 词：直接转矩控制 滑模变结构控制 状态观测器 电压空间矢量 磁链估算 

分 类 号：TM383[电气工程—电机] TH73[机械工程—仪器科学与技术]