論文標(biāo)準(zhǔn)WORD格式排版 39頁(yè)

摘 要
本文介紹了一種基于PIC16F877單片機(jī)的電動(dòng)機(jī)過(guò)熱及熱閉鎖保護(hù)裝置的硬件系統(tǒng)設(shè)計(jì)。這一設(shè)計(jì)利用電動(dòng)機(jī)正、負(fù)序等效電流實(shí)現(xiàn)電動(dòng)機(jī)的過(guò)熱及熱閉鎖保護(hù)。具有高性價(jià)比、高可靠性、智能化等特點(diǎn)。給出了保護(hù)動(dòng)作的模型和算法。系統(tǒng)能對(duì)電動(dòng)機(jī)的熱過(guò)載故障做出準(zhǔn)確判斷且具有良好的可靠性、重復(fù)性，其動(dòng)作值、動(dòng)作時(shí)間的精度能達(dá)到一般工業(yè)現(xiàn)場(chǎng)的要求。系統(tǒng)還能與上位管理計(jì)算機(jī)進(jìn)行串行通訊。

關(guān)鍵詞：電動(dòng)機(jī) ；熱過(guò)載及熱閉鎖保護(hù) ；單片機(jī) ；串行通訊

Abstract
The paper describes the hardware configuration design of an electronic thermaloverload and thermallock protector with PIC16F877 single chip. This design uses a method for microcontroller-based relay of motor thermaloverload and thermallock. This intelligent protector has a high performance-cost ration. Its reliability is improved. The paper gives mathematical model of the protection, discrete algorithm and realizing method based on microcontroller. The protector can make precise judgement to motor thermaloverload and have higher reliability and repetition. The precisions of its action value and action time can meet the need of general engineering application. It also can realize serial communication to the superior computer by RS-232C interface chip.

Key Words: motor ; thermaloverload and thermallock protection ; single chip ;
serial communication

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