基于单片机的交流调压调速系统设计（毕业论文）.doc

摘要调速系统设计思想是用进行控制。通过来达到的目的系统的总体结构主要由主回路，驱动电路，光电隔离电路，，保护电路，STC89C51RC单片机，测速发电机等组成。 ABSTRACT In the power transmission system, AC motor has some DC motor can not match the advantages, such as stand-alone capacity, armature voltage, rated speed and price. But due to the AC motor speed control has been more difficult, so for a long time, the AC motor can only for constant speed operation, and requires accurate, flexible and continuous speed control of the drive system, DC motor drive has accounted for a major position. However, in recent years, on the one hand, with the rapid development of high power controllable power electronic components and frequency conversion technology, AC motor variable speed drive system to replace the DC motor drive system has become possible, on the other hand, from the viewpoint of saving asked to original constant speed AC motor drive system change is an adjustable speed drive. So in the field of power transmission is being paid increasing attention development of AC motor variable speed drive, become the new development direction of the motor speed. AC adjustable speed system design pressure is by changing the stator voltage to realize adjustment of motor speed control system for pressure regulating and speed control system, and motor stator voltage is through the thyristor tube element is composed of a pressure control device. Through control thyristor trigger angle, the AC output fundamental voltage effective value of control to achieve pressure and speed adjustment. The overall structure of the system mainly by the main circuit, driving circuit, a photoelectric isolation circuit, trigger, voltage and current detection and protection circuit, stc89c51rc SCM, tachometer generator. Pressure regulating speed circuit is simple, low cost, simple operation, convenient and high requirement of speed performance, small capacity dragging device used in. KeyWords:Thyristor,Voltage Control,SCM 目 录 摘 要 i ABSTRACT ii 第一章 绪论 1 1.1 交流调速的发展状况 1