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本文给出两种观测器，一种是基于龙勃格观测器和自适应理论的转子磁通观测器，当转速未知时该观测器仍具有较高的观测精度；另一种是转子转速的非线性观测器，在该观测器中，转子转速是状态变量而非参数，克服了线性观测器中将转子转速作为参数带来的电机瞬变过程中转速观测不准的缺点，并在此基础上给出负载转短的估计公式，给出了仿真结果．
In this paper, two kinds of observers are given, one is the rotor flux observer based on the Long Boge observer and the adaptive theory. When the rotation speed is unknown, the observer still has high observation accuracy. The other is the rotor speed In this observer, the rotor speed is a state variable rather than a parameter, which overcomes the shortcoming of inaccurate speed observation during the motor transient caused by the rotor speed as a parameter in the linear observer. Based on this, The estimation formula of load shortening is given and the simulation results are given.