The Research And Design Of Drive Control System For Electrical Vehicle

The design of drive control system is one of the main topics in electrical vehicle implementation. For a novel two-wheel self-balanced electrical vehicle, its drive control system must meet the high demand of safety and reliability. In this paper, such kind of drive control system has been introduced. This system is designed to control six-phase Permanent Magnet Motors, and is based on TI’s DSP-TMS320LF2407A. Since six-phase Permanent Magnet Motors have much higher reliability than the normal three-phase motors, it has provided large potential for the control system’s safety. Meanwhile, the redundant structure of six-phase Permanent Magnet Motors can be fully exploited by the drive control system. When part of the drive control system cannot work properly any longer, the rest of the system can drive the electrical vehicle alone and lead it to shut down safely. During the design of drive control system for two-wheel self-balanced vehicle, several problems should be considered carefully.In this paper, the demands of two-wheel self-balanced vehicle are analyzed firstly. Those demands determine the structure of drive system. Secondly, the mathematical models of two kinds of six-phase Permanent Magnet Motors are discussed precisely. The redundant structure of six-phase Permanent Magnet Motors is fully used in this design. If some of the stator windings are out of work, the output of power and torque will change but not diminish. On the basis of the mathematical model, proper control strategy should be chosen. According to the demands of safety and reliability, the structure of the drive control system should reach the design criteria of redundancy.Based on the structure of drive control system, the hardware and software parts of the system are designed successively. The hardware part is based on TI’s DSP-TMS320LF2407A. It should solve the problems of motor-driven, close-loop control, communication with high-level systems, power and protection. The software part deals with the control algorithms mainly. Also, the software part should handle the issue of data synchronization between two DSPs. Finally, a real experimental system is introduced and some engineering problems in this system are discussed.