基于二阶滑模观测器的无刷直流电机转子位置估计.pdf

第 47 卷 第 8 期 天津大学学报 (自然科学与工程技术版) Vol.47 No.8 2014 年 8 月 Journal of Tianjin University (Science and Technology) Aug. 2014 DOI:10.11784/tdxbz201301003 基于二阶滑模观测器的无刷直流电机转子位置估计 史婷娜，马银银，王迎发，夏长亮 (天津大学电气与自动化工程学院，天津 300072) 摘 要 ：针对一阶滑模观测器 (F-SMO)存在的抖振和相位延迟问题，提出了基于二阶滑模观测器 (S-SMO)的线反 势 (LBEMF)估计策略，将不连续控制作用在滑模变量的高阶微分上，采用超螺旋算法设计控制率，能较好地削弱抖 振，得到连续光滑且无滞后的反电势估计值．针对相反电势法存在的相移问题，采用线反电势过零点直接作为换相 点的换相策略．仿真和实验结果表明，所提策略能够准确估计无刷直流电机线反电势，获得准确的转子位置换相 点，实现无刷直流电机的无位置传感器控制． 关键词 ：无刷直流电机；二阶滑模观测器；线反电势；换相策略 中图分类号：TM383 文献标志码 ：A 文章编号 ：0493-2137 (2014)08-0697-06 Rotor Position Estimation of Brushless DC Motor Based on Second-Order Sliding Mode Observer Shi Tingna ，Ma Yinyin ，Wang Yingfa ，Xia Changliang (School of Electrical Engineering and Automation ，Tianjin University ，Tianjin 300072 ，China) To solve the chattering and phase delay problems existing in first-order sliding mode observer (F-SMO) ， Abstract ： line back-electromotive force (LBEMF)was estimated by a second-order sliding mode observer (S-SMO)which ap- plied the discontinuous control function on the high order differential of sliding mode variable and employed a super- twisting algorithm in control design. To deal with the phase shift problem ，a new commutation strategy based on LBEMF zero-crossing point was proposed. Simulation and experiment results show that the sensorless control system can estimate LBEMF exactly ，and accurate rotor position commutation point is gained. brushless DC motor ；second-order sliding mode observer ；line back-electromotive force (LBEMF) ； Key