Abstract:Aiming at the problems of the traditional sensorless drive control technology of permanent magnet synchronous motors(PMSM) at low speeds due to the low back-EMF amplitude, the large rotor angle error, and the severe chattering phenomenon, in order to obtain the rotor position information in all kinds of PMSM working conditions, the mathematical model of PMSM is analyzed in detail, and a high-frequency pulse vibration voltage signal injection strategy is studied.By injecting high-frequency voltage excitation into the estimated straight axis, the salient pole effect of the difference in inductance between the orthogonal axis and the orthogonal axis is constructed.By detecting the high-frequency current response of the orthogonal axis to extract the rotor error information, real-time tracking of the rotor position is achieved.Theoretical analysis and simulation results show that the strategy can accurately identify the real-time angular position of the permanent magnet rotor, and is suitable for various working conditions of permanent magnet synchronous motors.It shows strong robustness when the load is momentarily increased or decreased.