Research On Vector Control Method Of Permanent Magnet Synchronous Motor Based On Parameter Identification

With the emergence and application of high-performance motors,permanent magnet synchronous motor(PMSM)is extensively used in industrial control,electric vehicles,household appliances,ship propulsion and aerospace because of its small size,light weight,high power factor and wide speed range.Permanent magnet synchronous motor is a high order,strong coupling and nonlinear system.Many control strategies of PMSM require precise motor parameters to achieve better control performance.Because of the slow development of the integration of motor and motor driver,it is necessary to match the parameters between motor and electronic control to obtain better control performance.In order to improve the fast matching and the performance of vector control,the multi-parameter identification process and the current loop design method based on parameter identification are studied in this paper.The main research contents of this paper are as follows:1.Firstly,the physical model of permanent magnet synchronous motor is introduced,and the coordinate transformation formula is deduced.Secondly,according to the physical model and coordinate transformation principle,the mathematical models of permanent magnet synchronous motor in three coordinate systems are established.Then,the principle of vector control and zero-axis current control are introduced.Finally,the identification methods of parameters of permanent magnet synchronous motor are studied.2.In order to improve the efficiency and automation of multi-parameter identification,the identification process of motor zero position,stator resistance,motor flux linkage and cross-axis inductance is studied and analyzed,and the multi-parameter identification process is optimized.Secondly,the identification bias is analyzed and an automatic identification exit condition is designed to make multi-parameter identification automatically,and then the parameters are analyzed.Importance,a weighted identification method is proposed.Finally,an experimental platform is built to verify the proposed method,and the effect of process optimization is compared and analyzed.3.The simulation model of vector control for permanent magnet synchronous motor is established.The influence of parameters of permanent magnet synchronous motor on vector control is studied and analyzed.The simulation experiment is carried out to verify the model.Secondly,in order to improve the efficiency and control effect of current loop tuning,a parameter design method of current loop controller based on parameter identification results is designed,and the stability of the design method is analyzed.At the same time,the validation range of parameter identification results is obtained.4.In order to improve the effect of vector control and the efficiency and automation of current loop parameter setting,a method of parameter automatic identification and current loop parameter automatic setting is designed based on multi-parameter automatic identification.The results of parameter identification are directly applied to vector control.Then the correctness and feasibility of the method are verified by speed loop experiment.Finally,the bench test model is used.The actual use environment of PMSM is designed to test the designed method,and the control effect of vector control is analyzed,which achieves the expected goal.