Phase Current Phase Correction of PMSM in Low Speed Section Based on Hall Sensor

The three-phase current of a permanent magnet synchronous motor(PMSM) in an undersea vehicle propulsion system lags after reconfiguration due to the software delay within the system. To address this issue, the angles of the three-phase current synthesis vector and the rotor position estimation angle during the low-speed operation of the PMSM are analyzed in principle, and a method is proposed to fuse the data of the two angles to obtain the optimal estimated angle to correct the phase current phase. First, the Kalman filtering of the three-phase current is performed during the low-speed operation of the motor; subsequently, the angle of the synthesized vector is calculated using the three-phase current amplitude, and the position bias of the Hall sensor itself is reduced by using the average speed compensation method; next, the rotor position is estimated using the rotor position estimation method; finally, the optimal angle is obtained by fusing the synthetic vector angle and the rotor angle and correcting the three-phase current phase to reconstruct the three-phase stator current value. The experimental results show that the phase correction method based on the Hall sensor can enhance the interference resistance of the conventional PMSM control system, reducing the difference between the reconstructed three-phase current values and the real values.