Applied Research On Amorphous Permanent Magnet Synchronous Motor Control For Electric Vehicles

Electric vehicles (EV), which set the computer electronics and chemistry of these high-tech disciplines in, are the vehicle, electric drive, new energy, intelligent control and other projects in the latest results of the integrated product. In the new century, awareness of environmental pollution and energy shortages, people have attached great importance to promote the related businesses company around the world to focus on electric vehicles, and made significant progress.Amorphous permanent magnet synchronous motor (APMSM), with a small size, light weight, speed range, high power density, easy operation and reliability, is good as electric vehicle drive motor. Direct Torque Control (DTC), directly controlling stator flux and torque, is simple structure and innovative technology. Under the background of the joint research projects from U.S. Light Engineering Inc Ltd. and Guangdong University of Technology Machinery Equipment Manufacturing and Control Laboratory, it is mainly engaged in electric vehicle drive subsystem onAPMSM modeling and control research in this thesis.Firstly, the commonly used core materials and structure of amorphous permanent magnet synchronous motor are introduced in this thesis. After analyzing the necessity of coordinate transformation, explaining the principle of coordinate transformation and the used coordinate transformation formula, APMSM mathematical model are respectively established in the three-phase stationary coordinate system, two-phase stationary coordinate system and two-phase rotating coordinate system, thereby permanent magnet synchronous motor voltage equation, flux equation and torque equation were derived.Secondly, based on analysis of basic principles of DTC, the mathematical models of three-phase voltage source inverter and stator flux are derived. Build permanent magnet synchronous motor direct torque control MATLAB/SIMULINK model and simulate.Thirdly, thanks to the conventional DTC output ripple range and poor immunity, it proposed fuzzy PID to improve performance. Simulation results show that the fuzzy PID controller, instead of the traditional PID controller for APMSM, improve the system dynamic performance, reduce the output ripple and enhance the system robustness.At last, based on fuzzy PID, structure the hardware topology of EV PMSM DTC system. After designing DSP TMS320LF2406APZA controller as core of the smallest systems, DSP algorithms structure and control software are designed finally in this thesis.