Research On Permanent Magnet Synchronous Motor Of Electric Vehicle

The development of automobile market brings new challenges to our country’senergy security. So, it is very necessary and urgent to develop clean energy vehiclesespecially electric vehicles. The permanent magnet synchronous motors have highefficiency, high power density and are more in line with our national energy strategy.Therefore, a permanent magnet synchronous motor used in an extended range electricvehicle is designed based on the actual operation needs of electric vehicles.The characteristic and vector control principle of permanent magnet synchronousmotor are studied and a permanent magnet synchronous motor control model is buildbased on that. The overall design and electromagnetic design of the motor are alsocompleted based on that. Then permanent magnet synchronous motor efficiency Mapsunder different control strategies are given by simulation computation and a controlstrategy more applicable to the electric car is chosen.Because of its peculiar application situation, the design of permanent magnetsynchronous motor must meet the actual operation condition of electric cars. A set ofbasic PMSM performance parameters selection methods is developed based on theanalysis of the electric car actual operation condition. In the final motor performancetest, the electric car operation requirements are also fully considered. The motorperformance is verified separately from the motor and vehicle two levels.Motor design is a long process of modification and optimization. In this paper, themotor design gives fully consideration to the relationship of the overall design,electromagnetic parameters and the performance of motor. Motor size andelectromagnetic parameters are designed use both magnetic circuit calculation methodand magnetic field finite element analysis method.The design also considers the motor performance in the whole work region. Themotor efficiency map is introduced into the vehicle simulation model, so that the motorperformance can be analyzed under different vehicles operation conditions. The motorparameters are optimized to expand the motor of the actual operation high efficient areabased on the actual operation condition of electric cars. This method makes motordesign more quickly and accurately.Finally, the driving range of the electric car that using the permanent magnetsynchronous motor finally designed is calculated.