【正文】 jamming devices and other measures should focus on new issues . And puts forward a set of microputercontrolled induction motor Y / Δ switching energy protector design, get a higher cost. And traditional motor Y / Δ switching energy protector in Y / Δ frequent switching occurs around the switching point of the new problems raised manually setting the scene critical load rate and switching time solutions. Finally, make out a test prototype and carried out performance testing, test results show that the prototype to achieve the expected control performance and energy saving effect, verify the feasibility. This is also the basis of experimental results conducted indepth analysis and discussion, in order to further improve the program proposed to improve the direction and approach. Keywords： Asynchronous motor energy Y/train switching microcontroller 目錄 摘要 ............................................................................................................................................. I Abstract ...................................................................................................................................... II 第 1 章 緒論 .............................................................................................................................. 1 我國(guó)電動(dòng)機(jī)保護(hù)器的發(fā)展歷史及現(xiàn)狀簡(jiǎn)介 ............................................................... 1 熱繼電器 ............................................................................................................. 1 模擬電子式電動(dòng)機(jī)保護(hù)器（電機(jī)保護(hù)器） ..................................................... 1 數(shù)字電子式電動(dòng)機(jī)保護(hù)器（電機(jī)保護(hù)器） ..................................................... 1 電動(dòng)機(jī)節(jié)能的必要性 ................................................................................................... 2 電能消耗原因與解決措施的初步分析 ....................................................................... 3 常用的電動(dòng)機(jī)節(jié)能保護(hù)方法與分析 ........................................................................... 3 老式的 Y/△轉(zhuǎn)換節(jié)能電路 ................................................................................ 3 電子式軟啟動(dòng)器 ................................................................................................. 5 單片機(jī)控制的 Y/△轉(zhuǎn)換節(jié)能保護(hù)器 ................................................................ 5 本文主要內(nèi)容 ............................................................................................................... 6 第 2 章 三相異步電動(dòng)機(jī)節(jié)能原 理分析 [1] ............................................................................... 7 三相異步電動(dòng)機(jī)的功率損失 ....................................................................................... 7 銅損失 ( CuP ) ........................................................................................................ 7 鐵損失 ( FeP ) ........................................................................................................ 7 機(jī)械損失 ( fwP ) .................................................................................................... 8 雜散損失 ( sP ) ...................................................................................................... 8 總損失 ( P? ) ........................................................................................................ 9 △ /Y轉(zhuǎn)換的工作特性 [7] ................................................................................................ 9 1I 與 ? 關(guān)系分析 .............................................................................................. 10 ?COS 與 ? 關(guān)系分析 ....................................................................................... 12 △ /Y轉(zhuǎn)換時(shí) ? 與 ? 關(guān)系分析 .......................................................................... 13 △ /Y轉(zhuǎn)換的節(jié)能原理 ................................................................................................. 14 第 3 章 三相異步電動(dòng)機(jī)節(jié)能保護(hù)器控制結(jié)構(gòu)的分析 [2] ..................................................... 15 單片機(jī)控制電路主芯片分析 ..................................................................................... 15 三相異步電動(dòng)機(jī)△ /Y轉(zhuǎn)換節(jié)能保護(hù)器系統(tǒng)框圖 [8] ................................................. 16 第 4 章 三相異步電動(dòng)機(jī)節(jié)能保護(hù)器的設(shè)計(jì) ........................................................................ 17 電動(dòng)機(jī)節(jié)能保護(hù)器的硬件電路設(shè)計(jì)與分析 [5] .......................................................... 17 線性整流濾波電路 ........................................................................................... 17 硬件保護(hù)電路 ................................................................................................... 19 保護(hù)器硬件抗干擾分析以及抗擾措施 [6] ........................................................ 20 電動(dòng)機(jī)節(jié)能保護(hù)器的軟件電路設(shè)計(jì)與分析 ............................................................. 21 程序流程圖與調(diào)試過(guò)程 ................................................................................... 21 保護(hù)器軟件抗干擾分析以及抗擾措施 [3][6] ..................................................... 23 第 5 章 Y/△轉(zhuǎn)換節(jié)能保護(hù)器電動(dòng)機(jī)主電路接線圖及其工作過(guò)程 .................................... 25 第 6 章對(duì)影響電動(dòng)機(jī)節(jié)能保護(hù)器設(shè)計(jì)過(guò)程的因素的討論 [4] ............................................... 27 有關(guān)空載電流對(duì)保護(hù)器的影響 ................................................................................. 27 采用交流采樣方法 ........................................................................................... 27 采用鑒相器電路 ............................................................................................... 28 對(duì)于硬件保護(hù)有可能躲不開(kāi)的△下啟動(dòng)電流分析 ................................................ 29 其他因素考慮 ............................................................................................................. 29 總結(jié) .......................................................................................................................................... 30 致謝 ............................................................................................................ 錯(cuò)誤 !未定義書簽。因?yàn)椴捎昧藛纹瑱C(jī)就使得在相同硬件條件下集多種功能與一體的綜合保護(hù)器的出現(xiàn)成為可能。然而近幾年我國(guó)出現(xiàn)了大面積缺電狀況，全國(guó)大部分省、市不得不實(shí)行錯(cuò)峰用電，分時(shí)拉閘限電，這使得對(duì)電機(jī)節(jié)能的研究變的更為重要與迫切。 常用的電動(dòng)機(jī)節(jié)能保護(hù)方法與分析 老式的 Y/△轉(zhuǎn)換節(jié)能電路 這種方法適用于正