Stator Current Optimal Control Strategy Of Permanent Magnet Synchronous Motor In Electric Vehicle

Modern automobile industry has accelerated the process of social progress,but caused environmental pollution and huge energy consumption as well, forthat each country have developed electric vehicles to ease these problems such asglobal warming and energy exhaustion due to the excessive oil consumption andother issues. Permanent magnet synchronous motor (PMSM) which has a smallvolume, large output torque, high power density and other excellentcharacteristics, is an ideal traction motor that is suitable for electric vehicle drive.Looking at the future development of the automotive industry, permanent magnetsynchronous motor drive control system will have a wider range of applications.Thus, it is of great significance of researching on high performance and reliablemotor drive control system.This dissertation firstly described the basic situation of electric car andmotor control system both at home and abroad and in this field the researchresults and development trends of permanent magnet synchronous motor control,briefly addressed the basic content of this dissertation; Secondly, detailed PMSMrelevant theoretical knowledge, classical vector control theory, and gave animproved space vector pulse width modulation (SVPWM)method and itsMATLAB/Simulink simulation results, from which it can be seen that using thismethod can not only reduce the current harmonic components, inhibit motortorque ripple, but also effectively improve the control performance degradationissues caused by dead-time effect of traditional SVPWM algorithm; Again at fullspeed range of motor current put forward the optimal control strategy of statorcurrent: namely, above the base speed adopting the maximum torque-per- ampere(MTPA) control, while up the base speed using maximum power outputflux-weakening control, and on the basis of the original PI regulator, joined theanti-windup algorithm and integral separation algorithm, the improved algorithmcan both improve the contradiction between the fast response and stability ofcontrol system, the system vibration problems, and also well solute the systemdisorders, even uncontrollable issue caused by controller saturation when motorhas passed the base speed; At last, according to the proposed algorithm a benchrelated test has been done to verify it, TI company TMS320F2812digital signalprocessor was chosen as the core of control system, as well relevant software,hardware design schematics and brief description, experimental bench-relatedpresentation and results analysis were given.