Research On Flux Weakening Control Of Permanent Magnet Synchronous Motor For Electric Vehicle

In recent years, the global environment and climate problems is worsening and global energy crisis is intensifying, As the Chai Jing "dome" broadcast, people have a new understanding and view on the haze and its surrounding environment. New energy vehicles appear in the public view as a new type of environmentally friendly transportation and attracted a wide spread attention, so the development of new energy vehicles is the trend of The Times. And motor control technology is one of the key technologies in the development of new energy vehicles, this paper analyzed PMSM in the following aspects.Firstly, this paper made a more comprehensive introduction and analysis of the development of electric vehicle technology in China and abroad, according to the non-salient pole and salient pole PMSM d-axis and q-axis inductance value, the mathematical model are introduced. Introduced several practical methods of weak magnetic control.Secondly, based on the concept of voltage limit and current limit circle ellipse leads to the weak magnetic speed control principle, this paper is with the single current regulator weak magnetic mode advantages and disadvantages are analyzed and discussed on the double current regulation, and set up the Simulink simulation model of traditional constant q-axis voltage method weak magnetic speed were analyzed, then some of the shortcomings of this control method is improved, the value of weak magnetic speed to the optimal shaft voltage, the motor in high speed condition, not because of the coupling of motor control system to lose steady state, but also to enhance the utilization efficiency of the motor with inverter rate.Thirdly, through several weak magnetic control method of simulation analysis and research of determined with adaptive voltage module of q-axis voltage optimal value method for the control strategy of the software and hardware platform is built, the platform controller DSP28335 as control core, design the software control program, mainly to build a hardware module IPM inverter module and voltage and current detection, through constant speed loading and constant load to be on acceleration and different control strategies of mutual conversion experiments verify the feasibility of the algorithm.