Research On Rotor Position Estimation Of Vector Control Of Permanent Magnet Synchronous Motors With Switch Hall Sensors

In the control of permanent magnet synchronous motors—PMSM,the detection of the rotor position is necessary to ensure torque control,for achieving high-performance control of PMSM.Traditional position detection methods include incremental encoders(INC)and resolvers.In order to reduce the cost of the system,a variety of sensor-less schemes have been proposed in the study of sensor-less.However,in actual engineering applications,there are many unreliable factors for sensor-less strategy.Aiming at the contradiction between sensor and sensor-less,a compromise solution is proposed.That is using switch Hall position sensors to detect the rotor magnetic field.This paper has conducted in-depth research and analysis on the position detection method of PMSM with switch Hall position sensor.The main work is as follows:Firstly,the thesis analyzes the position detection principle of the switch Hall position sensors,and the influence of the installation deviation of the switch Hall position sensors of PMSM.The rotor position estimation method of PMSM with switching Hall is discussed.By establishing a vector control model of a PMSM with switch Hall sensors,the influence of the position signal deviation on the FOC system is analyzed.From that,the thesis analyzes the main factors and characteristics of the rotor position estimation deviation from the motor operating state and the magnetic pole and Hall errors.They include the problems faced by the rotor position estimation during the motor start-up stage and the acceleration/deceleration process;the rotor position estimation problems caused by the asymmetry of the pole installation,the deviation of the Hall position sensor installation and the Hall position sensor failure,are discussed.At the same time,the characteristics of different average speed calculation methods are presented and compared.Focus on the deviation of the switch Hall installed in the motor,when using the traditional sector compensation algorithm,a novel correction method for the Hall position installation is proposed.By analyzing the three-sector average speed position compensation scheme,the mathematical model of the rotor position signal fluctuation caused by the Hall installation is derived.Based on the model,an adaptive variable-parameter notch and proportional integral phase-locked loop(N-PI PLL)is proposed,and the structure and parameters of the PLL are designed.Finally,a FOC system for a surface-mounted PMSM with switch Hall position sensors is built in MATLAB/Simulink.The traditional position estimation method and the proposed position estimation methods are implemented.With the established simulation model and system parameters,a FOC system on the Dspace DS1103 platform was carried and experiments results were discussed under various working conditions.The results show that the method proposed in this paper can effectively eliminate the harmonics and abrupt signals in the switch Hall position estimation,reducing the rotor position estimation error,improving the steady-state performance and dynamic response of the system,which verified the rationality and effectiveness of the rotor position estimate method with Hall sensor.