Research on Initial Position Detection of PMSM Based on High Frequency Pulse Signal Injection

For the PMSM, the estimation accuracy of the initial position affects the control performance directly. In some occasions with low control performance requirements, the rotor is generally dragged to the specified position to start the motor, which is difficult to meet the needs of high precision control. In this paper, an improved initial position estimation method is proposed. Chebyshev filter is used to replace the traditional Butterworth filter, combined with d-axis positive direction judgment to realize the initial position detection.