| In recent years, China’s eastern region multiply occurred haze weather. In individual cities, the polluted days even extended a half of the year. According to the statistics of relevant departments, the cause of haze weather is PM2.5particles and a third of these particles come from engine emission. 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, and then analyzed the characteristic of PMSM in electric vehicles. On the basis of that, the mathematical model of PMSM in electric vehicles was established, then, combined with the mathematical model, this paper introduced common control strategies of PMSM used by electric vehicles.Secondly, the design method of SVPWM was introduced, and SVPWM model was constructed with Simulink. Because of the SVPWM dead zone effect, the dead-time compensation algorithm based on stator’s current forecast was put forward. And the simulation system based on the algorithm of current and speed double closed loops were designed, and then, the simulation results proved the correctness of the algorithm.Thirdly, in according to the motor rotation speed overshoot and integral saturation phenomenon, the fuzzy PID control method is proposed. By using Simulink, simulation based on fuzzy PID control system was designed, and the simulation experiment proved that the fuzzy PID can inhibit speed overshoot and integral saturation effect.Finally, hardware experiment platform was set up with DSP28335as the control core, and the software control program was designed based on the platform. The experiments of dead-time compensation and fuzzy PID were designed on the platform, the result verified the feasibility of the algorithm practically. |
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