Accurate orientation of rotor flux is needed to ensure the success of vector control and full-order observer observation of flux. However, magnetic field orientation depends on motor parameters, and motor parameters change with ambient temperature and operating conditions. The Inverse Γmathematical model of the asynchronous motor is derived, and the full-order observer model of the asynchronous motor is established through the mathematical model, and then the influence of various parameters of the induction motor on the observed full-order observer flux is studied in the case of no feedback matrix. In addition, the relationship between the identification speed and the motor parameters is deduced by equating the actual current of the motor and the observed current of the q-axis. Due to the complexity of the relationship and the unclear physical meaning, a three-dimensional diagram of the variation of speed identification error and flux observation error with a plot for the actual speed and load of the motor. Finally, the simulation results show that the greatest influence is the stator resistance on the identification speed and flux observation of the induction motor.
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Su et al. (2024) studied this question.
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