摘要
電動(dòng)機(jī)在運(yùn)行中經(jīng)常會(huì)由于使用不當(dāng)而引發(fā)各種故障,造成電動(dòng)機(jī)損壞,影響經(jīng)濟(jì)生產(chǎn)。多功能電動(dòng)機(jī)綜合保護(hù)器能夠根據(jù)負(fù)載電流判斷線路中的各種故障并及時(shí)進(jìn)行保護(hù),最大限度的減少經(jīng)濟(jì)損失。本文在分析了目前國內(nèi)外電動(dòng)機(jī)保護(hù)器的研究進(jìn)展與現(xiàn)狀的基礎(chǔ)上,設(shè)計(jì)了一種以PIC16F877單片機(jī)為控制核心,集短路、堵轉(zhuǎn)、斷相、過載、過壓和欠壓等故障保護(hù)于一體的多功能電機(jī)綜合保護(hù)器。
本文首先對電動(dòng)機(jī)的相間短路、堵轉(zhuǎn)、斷相、過載、過壓和欠壓等常見電氣故障進(jìn)行了詳細(xì)分析,并結(jié)合PIC16F877單片機(jī)的功能特點(diǎn),提出了可靠性高、實(shí)施性強(qiáng)的故障保護(hù)實(shí)現(xiàn)方法。控制核心采用PIC16F877單片機(jī),其AD轉(zhuǎn)換接口用于輸入電機(jī)電壓、電流采樣,結(jié)構(gòu)緊湊,與現(xiàn)有電機(jī)綜合保護(hù)儀相比,增加了動(dòng)態(tài)液晶顯示驅(qū)動(dòng)電路用于顯示各種信息等功能。
根據(jù)文中提出的各類故障保護(hù)實(shí)現(xiàn)方法,設(shè)計(jì)并實(shí)現(xiàn)了電動(dòng)機(jī)保護(hù)裝置完整的硬件電路,給出了保護(hù)裝置完整的系統(tǒng)軟件實(shí)現(xiàn)方案。
關(guān)鍵詞 :三相電機(jī)保護(hù)器; 單片機(jī); 保護(hù)特性
Abstract
The production process are broken frequently due to the motor in operation are damaged, which is caused by abnormally running conditions. The intelligent motor protectors can be used, which will protect the abnormally running motors from damage, to minimize the malfunction time and reduce the economic losses. In this paper, a single-chip microcomputer, PIC16F877, based intelligent motor protector with functions of short-circuit protection,locked motor protection,phrase failure protection ,the overload protection ,over-voltage protection and under-voltage protection is designed on the basis of analyzing the development and status quo of motor protectors in the world.
In this thesis, the detailed analysis applied symmetrical component method of motor’s familiar electric fault on that a high-reliability implemental method of motor’s fault protection is provided according to the features of PIC16F877 microprocessor. The system is provided with A/D conversion interface used to sampling the input current of the motor and the structure is compact. Compared with the protection instrument for motor nowadays, this system increases functions such as dynamic LCD screen driven circuit to display different information.
According to the implemental method of motor’s fault protection the entire circuit diagrams are designed and the system software structure been easy to implement.
Keywords:Three-phrase motor protection; Single chip microcomputer; protection characteristic