Estimation of PMSM rotor position and speed based on switched-hall sensors

Using the switch type Hall position sensor to replace the traditional high-precision mechanical position sensor to estimate the rotor position and speed, and realizing the high-performance control mode of permanent magnet synchronous motor vector control, is a compromise scheme between the high-precision sensor and the sensorless mode, which can effectively reduce the cost and volume of the system and ensure the reliability of the system. In this paper, a new method is proposed, which converts the discrete Hall position information into plane coordinate points, and then uses the moving polynomial fitting method based on the least square method to obtain the rotor position curve, differentiates the position curve expression to obtain the speed curve, and then extends the curve to estimate the rotor position and speed. Finally, the simulation results show that the proposed method improves the estimation accuracy and error convergence speed, and has good adaptability in the full speed range, and improves the control performance of permanent magnet synchronous motor.