Design And Control Of Interior Permanent Magnet Synchronous Motor For Electric Vehicle

With the linear growth of automobile purchases all over the world,the excessive emission of automobile internal combustion engine waste has caused irreversible air pollution;at the same time,oil,as the main resource of automobile power system,is facing the status quo of depletion day by day.Since the advent of electric vehicles driven by clean energy,they have attracted the attention of countries all over the world.What followed was in-depth research on its drive motors.Various motors such as asynchronous motors have achieved unprecedented development in this revolution,and built-in permanent magnet synchronous motors are used in the field of electric vehicles because of their excellent characteristics.It stands out and has received extensive attention from various countries and automobile manufacturers.Combined with the development of permanent magnet motors for electric vehicles,it can be seen that the optimization of the magnetic circuit structure of the motor rotor can greatly improve the performance of the motor.Compared with the single-layer permanent magnet structure,the built-in permanent magnet synchronous motor with the double-layer permanent magnet structure can effectively improve the distribution of the air gap magnetic field,thereby obtaining greater peak torque,higher motor efficiency,and higher motor overload ability.In this paper,a "U one" double-layer built-in permanent magnet synchronous motor is designed for the hybrid electric vehicle drive system.The performance index of the motor is determined through various working conditions of the electric vehicle,and the motor’s performance is determined by the magnetic circuit method.The main parameters and topology.The finite element method is used to analyze the air gap flux density distribution waveform of the built-in permanent magnet synchronous motor for electric vehicles,optimize the topological structure of the magnetic isolation slot in the rotor,improve the leakage phenomenon,and increase the air gap flux density amplitude;Rotor oblique pole,tooth crown modification and other methods reduce the harmonic content of the motor no-load back EMF,thereby correcting the sine of the air gap magnetic field;On this basis,based on the genetic algorithm,global optimization is carried out with the goal of the smallest permanent magnet volume and the largest motor torque respectively,which improves the air gap magnetic density amplitude and torque of the motor,saves the amount of permanent magnets,and reduces the motor’s manufacturing cost;Finally,based on the optimization design of the permanent magnet synchronous motor structure,the mathematical model of the motor is established.Based on the vector control strategy,a double closed-loop vector control model of speed and current is built;and for the complex operation of electric vehicles,the speed loop is added The fuzzy PID control realizes the effective control of the drive motor when the electric vehicle is switched between different working conditions.