在异步电机控制基础上 ，利用扩展卡尔曼滤波器将转子转速看成系统的一个状态量 ，根据定子侧可以测量的电流、电压值 ，逐步估计出转子转速 ，为研制无速度传感器控制打下基础。
The rotor speed can be tacken as a state variable of the system by using the Extended Kalman Filter, which based on the vector control of an asynchronous motor.
尺寸小，重量轻，频率范围宽；具有电池电压欠压和工作状态指示；可内，外供电方式；非常适合于现场和无外接电源时的使用；
Small Dimensions, lightweight; Wide frequency range; Operation status LEDs; Low-battery warning; Internal or external power supply; Suitable for filed test.
尺寸小，重量轻，频率范围宽；具有电池电压欠压和工作状态指示；可内，外供电方式；非常适合于现场和无外接电源时的使用；
Small Dimensions, lightweight; Wide frequency range; Operation status LEDs; Low-battery warning; Internal or external power supply; Suitable for filed test.
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