Study Of Drive System Based On Permanent Magnet Synchronous Motor In Electric Vehicle

As the vehicles amount in the world increases sharply, traditional vehicles which use internal combustion engines bring us great facilitation, but at the same time, they do more damages to our environment. Electric vehicle (EV), which takes electrical energy as its power, becomes a focus on automotive industry development and research recently because of its zero-emission and non-pollution. The drive motor and its control system are the core part in the power system of electric vehicle. The digital vector control system of permanent magnet synchronous motor (pmsm) based on DSP is researched in this thesis.Firstly, the development condition and tendency of EV in the world are described. On the basis of comparing and analyzing every kind of motor's feature, PMSM is chosen as the drive motor for electric vehicle. Then the structure feature of PMSM is analyzed, and the mathematical model is established by coordinate transformation. The technology of Space Voltage Pulse Width Modulation is introduced in detail. The vector control algorithm is studied and the control strategy of id = 0 is applied according to the feature of PMSM used in this thesis.On the foundation of analyzing the PMSM control method, the hardware circuit of whole system has been designed. The design based on the TMS320F2812 DSP of control board, power drive board and signal processing board has been completed. Then the system programs used for vector control algorithm, the generation of SVPWM wave, the speed and location calculation and the communication with central monitoring system are developed under the DSP development environment CCS2.Finally, on the basis of software and hardware design, the experiment has been done on the drive system. The result shows that the system runs well and can satisfy a basic request. All the work in this thesis has created a good foundation for further study. Its performance can be improved by further debug.