Research On Fault Analysis And Treatment Of Permanent Magnet Motor Position Sensor For New Energy Vehicles

At present,the world automobile industry has entered a new era of technological revolution and innovation,and it has become a major trend for new energy vehicles to replace traditional fuel vehicles.However,due to technical limitations in energy systems and drive systems,most new energy vehicles are not ideal,status.Brushless DC motors(BLDC)and permanent magnet synchronous motors-(PMSM)are widely used drive motors,and permanent magnet synchronous motors will gradually replace brushless DC motors due to smaller torque ripple and higher efficiency.Trends.Both of the drives require accurate rotor position,and the rotor position sensor is essential,so the position sensor failure problem is particularly important in the development of new energy vehicles.Therefore,this thesis studies the fault analysis and processing technology of permanent magnet synchronous motor position sensor for new energy vehicles.This thesis first analyzes the importance arnd dependence of today’s society on new energy vehicles from various angles,and analyzes and compares the working principle and other performances of permanent magnet brushless DC motors and permanent magnet synchronous motors with broad development prospects.The principle and performance of se’veral existing rotor position sensors are introduced.By comparing and combining the actual situation,the permanent magnet synchronous motor vector control system using the Hall position sensor as the rotor position measurement is proposed as the driving system of the new energy vehicle.Then,the causes and types of position sensor failures of new energy vehicles using Hall position sensors under complex conditions are classified,and the possible effects of different fault conditions can be made by theory,MATLAB simulation and finite element method.The analysis and the reasonable and practical fault diagnosis method and the fault-tolerant scheme based on the Hall vector tracking observer make the faulty motor still have good working performance,ensuring that the electric vehicle can have enough time and state to enter the safety zone.To ensure the safety of the driver is not harmed.Aiming at the noise interference introduced by the system in the fault fluctuation caused by the fault,an extended Kalman filter method is proposed to filter and dry the output rotor signal,so that the useful information contained in the motor position signal is closer to the real one.Value,motor performance is more stable.Finally,the proposed Hall vector tracking observer fault-tolerant system and Hall signal de-drying scheme are verified by MATLAB simulation.