A method to determine gain matrix of stator flux full order observer

In order to improve observation accuracy of the stator flux and minimize observation error which is influenced by temperature,frequency and magnetic path in motor operation process,a full order observer was presented.The change of observation error was analyzed in the case of stator flux observer u-i model at high speed and i-n model at low speed when the parameters of motor changed based on the mathematical model in the stationary coordinates.A method to determine the gain matrix of full order observer was presented.The results show that the error changes with the change of motor speed and torque.On the premise of assuring stability of the observer,according to different speed ranges,choosing the proper way to set the pole of observer,the method can be used to improve the observation accuracy of stator flux at high speed,and it is also validated in the Matlab/Simulink condition.It is shown that it can improve observer accuracy of the induction motor stator flux effectively.