异步电机保护器硬件设计(本科毕业设计).docVIP

PAGE PAGE 1 论文题目：异步电机保护器硬件设计 专 业：自 动 化 本 科 生：** 签名：____________ 指导教师：** 签名：____________ Subject ：the hardware design of the protection for asynchronous motor Specialty ：Automation Name ：** Signature： ______________ Instructor：** Signature： ______________ 摘 要 本文以单片机C8051F020及其外围器件作为硬件平台，对电动机微机保护进行了研究，开发了主要针对大中型电动机的智能电动机保护器，具有过流保护、零序电流保护、负序电流保护、启动时间过长保护、欠电压保护、过电压保护等功能。 在研制电动机保护器的过程中，对电动机的各种故障进行了全面的论述。并根据需要确定了保护方案，论述了保护原理。 在硬件电路设计上，给出了以单片机C8051F020及其简单的外围电路为主体配置的电动机保护器系统。该电路硬件电路大为简化，除了实现了各种保护功能外，还可显示电动机运行时的电压、电流，同时设置了系统与上位机的连接,为系统功能的扩展创造了条件。作为一种智能化的解决方案，该系统具有可实现功能多，经济成本低，高的可靠性和稳定性等特点。 关键词：电动机，保护，C8051F020单片机 ABSTRACT In this paper ,an in-depth research for protection for motors is engaged in that is based on the platform that is mainly made up of the C8051F020 single-chip microcomputer. The intelligent protection device for large-scale and middle-scale motors .It has many functions such as the protection for such as over-load, over-voltage, low-voltage, the short of phase and the losing balance of phases, the leakage of electricity, the short circuit, the blocked rotor and the overtime starting. The principles of the various generator failures are detailed particularly. generator protection scenario is fixed with requirements, and then it also deliberately states principles of the generator protection scenario. The hardware platform is designed in term of the protective function. The system is based on the platform of C8051F020 single-chip microcomputer and other few peripheral control circuit. The design not only achieves the full functionality on generator protection, but also can display the transient voltage, current when the generator is running. Meanwhile, it is also built and configured the serial link between computer and the system which provide the great opportunity to make future expand. The system can achieve a more functional, economic low-cost, high reliability and stability as an intelligent solution. KEY