有无虚拟电压注入的感应电机无速度传感器驱动系统的可观测性分析

For speed sensorless induction motor drives, the unobservable problem of rotor speed at low synchronous speed has not been solved yet. To obtain a unified observable condition, the local weak observability concept is used in this paper. Based on the result of analysis, virtual voltage injection method is proposed. With this method, the states of induction motor, including rotor speed, are locally ...