I am working on MRAS Sensorless Vector Control of an Induction Motor Using Sliding Mode control. I use voltage model as a reference model. but I need the rotor flux and its derivative so i tried to use voltage model flux observer as in attached image. when the estimation stator current matchs the motor current, the rotor flux should match the motor flux. but in my case, the two current matched but the flux has very large error .can anyone helps me. thank you very much.