说明：  通过计算电机无功功率的方法估算异步电机转速的一种无速度传感器控制模型。初值在m文件中。可以观察到速度是收敛的，即模型有效。
(By calculating the motor reactive power methods to estimate an induction motor speed sensorless speed control model. Initial value in the m file. The speed of convergence can be observed, that the model effective.)