基于低精度编码器的异步电动机二阶滑模负载转矩观测方法  

Second-order Sliding-mode Load Torque Observer for Induction Motor Based on Low-precision Encoder

作　　者：谢燕朋 冯喜军 但汉兵[1] 蒋罗庚 粟梅[1] XIE Yanpeng;FENG Xijun;DAN Hanbing;JIANG Luogeng;SU Mei(School of Automation,Central South University,Changsha 410083,China;Wasion Electric Co.,Ltd.,Changsha 411100,China)

机构地区：[1]中南大学自动化学院,长沙410083 [2]威胜电气有限公司,长沙411100

出　　处：《电源学报》2025年第2期224-231,共8页Journal of Power Supply

摘　　要：在电动工业车辆领域,为节省成本同时保证电机驱动性能,常采用低精度编码器。低精度编码器可获取转子的准确机械位置,但对于转速测量存在较大时滞和误差,因此传统负载转矩观测器不能得到准确的负载转矩信息。采用该信息作为电流环前馈控制量时,不能有效抑制转速波动。针对此问题,提出1种基于低精度编码器的二阶滑模负载转矩观测器。所提方法可基于转子位置信息获取精确的负载转矩信息,从而提高系统的抗干扰性能。仿真和实验结果证明了所提基于低精度编码器的二阶滑模负载转矩观测器的正确性和有效性。To ensure the motor drive performance while saving cost in the field of electric industrial vehicles,low-precision encoders are often adopted.Although these encoders can measure the rotor’s accurate mechanical position,they introduce a long delay and large errors to the measured speed information.Therefore,the traditional load torque observers cannot obtain the accurate load torque information,and when the inaccurate information is used as feedforward of the current loop,the motor speed fluctuation cannot be effectively suppressed.To solve this problem,a second-order sliding-mode load torque observer based on a low-precision encoder is proposed,which can obtain the accurate load torque information based on the rotor position information and thus improve the anti-interference performance of the system.Finally,the correctness and effectiveness of the proposed method was verified by simulation and experimental results.

关 键 词：异步电动机 低精度编码器 滑模观测器 负载转矩观测器 

分 类 号：TM343[电气工程—电机]