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

As the vehicles account in the world 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, which takes electrical energy as its power, has quite wide foreground because of its zero-let and non-pollution. The drive motor and its control system are hard core in the power system of electric vehicle. The control system and its fuzzy control of permanent magnet synchronous motor based on DSP are researched and designed in this thesis.Permanent magnet synchronous motor applied in the electric vehicles is used as the object of study in this article, the structure feature of permanent magnet synchronous motor is analysized firstly. Then the mathematical model is established by Rotor coordinate axis in foundation of vector control. Then vector control system structure drawing of permanent magnet synchronous motor is given, and the current controller and speed controller are studied in control system of permanent magnet synchronous motor. Meanwhile, the speed controller will be improved and one design based on the fuzzy PI speed controller is proposed. the fuzzy control is applied in control system of permanent magnet synchronous motor. The merit is displayed fully in the thought which the fuzzy control and the PI control combine in this design, the fuzzy control is used for realizing the macrocontrol to achieve the fast control, and the PI control is used for realizing the microcontrol to achieve the accuracy control.Permanent magnet synchronous motor control system simulation model is constructed under MATLAB/SIMULINK simulation environment, and the SVPWM vector control system is carried on the simulation. Meanwhile fuzzy PI controller application in permanent magnet synchronous motor control system is conducted the simulation research. The simulation results indieate that The fuzzy PI speed control contrasts the PI speed control, the system response speed has the remarkable enhancement, tendency and static property of the motor control system can be improved, and it is suitable for working request of the electric vehicle. At last, concrete hardware and software design of Permanent magnet synchronous motor control system are designed. the DSP2000 series chip is used in the hardware design for the motor control. The hardware circuit mainly includes: Main return route, driving circuit of IPM, the electric circuit of examination, protection circuit, accelerator and files position electric circuits and so on. In software design aspect, master routine and the interrupt service are desinged through using the C language and assembly language mix programming method, and PWM interrupt servicing module and breakdown interrupt servicing module detail flowchart are given. Simultaneously the detailed theory is made by the modulation aproach of space voltage vector, And the switch pattern is determined by the hardware. At last antijamming measures of hard and software designs have also been given simultaneously.