基于励磁电流的感应电机速度滑模观测

Sliding-mode Rotor Speed Observer of Induction Machines Based on Magnetizing Current

以感应电机两相静止坐标系数学模型为基础,通过电动机的定子电压和电流的检测信号计算电动机的反电动势,根据反电动势的计算建立了电机励磁电流的滑模观测器,并利用励磁电流的观测设计了电动机速度滑模观测器。在滑模观测器设计中用Lyapunov定理验证了所设计观测器的稳定性。仿真结果表明:所设计的滑模观测器具有良好的观测精度,结构简单,并且对外部负载扰动及定子电阻和转子电阻参数摄动具有较强的鲁棒性。

Based on mathematical model of induction motor system of two-phase stationary reference frame, the back electromotive force （EMF） is calculated from the stator current and the stator voltage signals. The magnetizing currents observer is obtained from the back EMF. And a rotor speed observer for induction-machine drives is designed based on a sliding-mode approach and magnetizing current estimation. The stability analysis is achieved based on the Lyapunov approach. Simulation results show that the proposed sliding mode observer has high observing precision, simple structure. Moreover, the proposed observer is robust to load disturbance and Rs and Rr parameter oerturbation.