PMSM Vector Control System Based On Hall Position Sensor And Its Deviation Correction Technology

The use of the Hall position sensor to realize the sinusoidal drive of the permanent magnet synchronous motor reduces the volume of the system while realizing the high-performance operation of the motor,which has important research and application value for improving the power density of the system.However,the Hall position sensor will cause the asymmetry of the output signal due to processing and installation errors,which will increase the speed and angle estimation error,and affect the performance of the system.This paper studies the vector control system of permanent magnet synchronous motor based on Hall position sensor and its deviation correction.The interpolation method has the advantages of simple principle and no need for motor parameters to estimate the speed and rotor position.In the presence of deviations in the Hall signal,the estimated speed error is obvious.In response to this problem,this paper proposes a scheme that uses three-Hall sector calculation speed combined with recursive least square filtering to reduce the speed calculation error.Both methods can significantly improve the speed estimation accuracy under steady-state conditions.For the situation where the direct correctio n of the estimated rotor position leads to a sudden change in the rotor angle that affects the sine of the current,this paper adopts a solution of linear correction combined with secondary processing by the observer.Compared with the observer processing directly,the linear correction preprocessing can be used to improve the observer gain while obtaining a high-precision rotor position.The speed and position obtained by the interpolation method have a large error when the motor is in the dynamic process,resulting in poor dynamic performance of the system.In order to make up for the shortcomings of the interpolation method,this paper studies a method based on the Hall position vector feedback decoupling Romberg observer to estimate the motor speed and rotor position.When there is a deviation in the Hall signal,the feedback decoupling part of the observer cannot effectively eliminate the low-order harmonic components in the input signal,resulting in an increase in the estimated speed and rotor angle er ror.In order to reduce the error and improve the accuracy of the observer,this paper proposes the use of frequency tracking filter and dual observer cascade to further eliminate the low-order harmonics that cannot be eliminated by the feedback decoupling part of the original observer.In order to verify the feasibility and specific effects of the above-mentioned improvement scheme,a permanent magnet synchronous motor vector control experiment platform based on Hall position sensor was built.On the expe rimental platform,the steady-state and dynamic experimental researches were carried out on the interpolation method and the observer method.