Research Of Permanent Magnet Brushless DC Motor Starter/Generator System

With the development of power electronics and novel electrical machine, the starter/generator system has been getting more and more attention. It has been a very important part of the aircraft and automobile power system. Its main function is to start the engine and generate electric power after the engine is started. This paper describes the principles and characteristics of the permanent magnet brushless DC motor (PMBLDC) starter/generator system and designs a motorcycle starter/generator system. At first, the basic structure and operation principle of the PMBLDC starter/generator system are introduced. The statistic characteristics and mathematics model of the motor are founded and analyzed. Secondly, a method for modeling of PMBLDC in the MATLAB environment is presented, which is suitable for other mixed model system. According to the operation principle of the PMBLDC, a simulation model of the starter/generator is constructed.The last part of this paper describes the motorcycle power system design and the debugging process. The test waveforms are shown and demonstrate the correctness of the theoretical study and digital simulation.The research work in this paper has revealed the systematical nature of the PMBLDC starter/generator system and much more research and application should be carried out as soon as possible.