Research On Control System Of Three Phase Permanent Magnet Synchronous Motor For Main Propulsion Of Electric Aircraft

In recent years,with the rapid development of semiconductor technology,the storage capacity of battery has been improved obviously.New energy electric aircraft has entered people’s vision and become one of the research hotspots in aviation field.Electric propulsion system is the power core of electric aircraft,which provides guarantee for the stable and safe flight of the aircraft.Permanent magnet synchronous motor is the first choice for electric propulsion system because of its small size and high power density.Therefore,the research on PMSM control system of electric aircraft main propulsion has very important practical significance and value.In this paper,the main propulsion three-phase permanent magnet synchronous motor control system of electric aircraft is studied.According to the characteristics of permanent magnet synchronous motor,the double closed-loop control system of speed and current is designed and analyzed by using vector control technology.Furthermore,aiming at the practical engineering requirements of PMSM with fault-tolerant function,the fault-tolerant strategy of PMSM for open phase fault is proposed,and the design and implementation of control system hardware and software circuit are completed.Firstly,the research progress of general aviation electric aircraft and control technology at home and abroad is described,and the advantages of vector control are compared and analyzed.Combined with the structural characteristics of permanent magnet synchronous motor of electric aircraft,the mathematical model of speed and current double closed-loop speed control system of permanent magnet synchronous motor is established.Secondly,the simulation analysis of the model is carried out to complete the analysis of SVPWM control strategy and CHBPWM control strategy.The operation conditions of load start-up and variable load operation are studied.The correctness of the model and the feasibility of the scheme are verified by simulation experiments.Furthermore,aiming at the common operating conditions of acceleration and deceleration,the control system is improved,and the sliding mode control method is introduced to replace the PI control of speed loop,so as to effectively improve the robustness of the system.Thirdly,aiming at the phase failure of PMSM in practical engineering,the output characteristics of SVPWM control and CHBPWM control schemes are simulated and compared.The simulation results show that the speed and current ripple of SVPWM control is smaller than that of CHBPWM control,and the system is more stable.On this basis,the fault-tolerant strategy of phase failure is proposed.The simulation results show that the proposed fault-tolerant strategy has good control effect.Finally,the permanent magnet synchronous motor control system with Infineon TC1728 as the main control chip is designed,the programming environment of Dave and TASKING is established,the control system is made and the experimental platform is built.The experimental test of the three-phase permanent magnet synchronous motor control system is carried out,and the output waveform shows that the control system meets the motor control requirements It can be used as a reference for the further study of control system and the optimization of control strategy.