大功率无刷直流电机控制器的分析-测试计量技术及仪器专业论文.docx

Abstract Environmental pollution and energy shortage have become increasingly serious in todays society, and there is no doubt of that the electric car is a better solution to solve these problems, and also to a large extent eases the pressure of oil resources crisis the transport. the electric bicycle, electric motorcycle and electro-mobile have a rapid development in recent years, which fall in the electric car.Initially, brush DC motor, as the power system of the kind of transport, but there are many defects after working long.In recent decades, as the development of the new permanent magnet materials, integrated circuits, power electronics and control algorithms, especially the application of power switching devices in the driver circuit is more and more mature. Brush motor has gradually replaced by brushless DC motor and become a dominant force in the power system. The control technology of the brushless DC motor determines the security and stability of the electric car system. The control object of the high-power brushless DC motor control system is brushless DC motor.Firstly, this paper introduces the structure and working principle of the brushless DC motor and after comparison find that it is more suitable than brush DC motor as a dynamic system, and then establish the differential equations and transfer function model. It contributes to familiar with the operating characteristics of the brushless DC motor in theory. Secondly, design the overall structure and the hardware circuit of the high-power brushless DC motor control system. The overall structure contributes to a comprehensive understanding of the functionality of the controller and the focus of the controller. The power supply circuit is the premise of the system; the drive circuit is the basis of the controller, the current acquisition circuit to protect the safety of the controller, while the other functional circuit determines the overall level of the controller. If the hardware is the skeleton