【正文】 ..... 58 致 謝 ............................................................................................. 59 參考文獻(xiàn) ......................................................................................... 60 V CONTENTS ABS TRAC T ........................................................................................I ABS TRAC T ...................................................................................... II Chapter 1 The introduction ............................................................... 1 The meaning of the title ......................................................... 1 The devdlopment situation at hoem and abroad .................... 2 Design of main content .......................................................... 6 Chapter 2 F requency control of motor speed control principle ............ 7 Inverter speed regulation principle ......................................... 7 Under the fundamental frequency control of motor speed 8 Above fundamental frequency control of motor speed ... 8 Inverter.................................................................................. 9 Inverter type ................................................................. 9 The uss of transducer .................................................... 9 Basic institutions of the inverter ................................. 10 Frequency co nverter control circuit ............................ 10 F requency co ntrol of motor speed control method ................ 12 Constant voltage frequency ratio control ..................... 12 Ve ctor control............................................................. 12 Revolut ional S lip control............................................ 13 VI Logarithmic control level ........................................... 13 S eries resistance frequency converter speed regulation ........ 14 Chapter 3 bridge crane frequency speed control system design .......... 16 The structure of bridge crane ............................................... 16 The design scheme ............................................................... 17 C rane design requirements ................................................... 20 Motor, inverter and auxiliary parts ....................................... 22 .......................................................................... 22 ....................................................................... 24 ............................................................................ 28 Chapter 4 Application of P LC, frequency converter control system ... 29 O verview of P LC and its position .................................. 29 S ummary of P LC ........................................................ 29 The architec ture o f the P LC ........................................ 31 The selectio n of P LC and its characteristics ......................... 34 Twido and S iemens S7200 .......................................... 34 Two kinds of P LC selection ........................................ 36 Variable frequency speed control system design ................... 37 The essentia l requirement of governing system ........... 37 The principle diagram of the system ........................... 42 S ecurity, protection and detection ........................................ 45 Hoisting mec hanism AnQ un, test ................................ 45 walk s security protection and test anization ...... 45 P iezoelectric security protection and test .................... 46 Chapte r 5 Bridge crane system software design ............................... 47 P LC software programming and programming ...................... 47 S ummary of the P LC programming software ............... 47 VII The program design .................................................... 48 Touch screen software design ............................................... 54 Configuration software ............................................... 54 Touch screen interface design ..................................... 55 Anti interference measures ................................................... 56 CONDUS ION ................................................................................... 58 ACKNOWLEDGEMEN T .................................................................. 59 REF ERENC ES .................................................................................. 60 1 第 1 章 緒論 橋式起重機(jī)是現(xiàn)代生產(chǎn)工業(yè)比不可少的重型運(yùn)輸機(jī)械，得到了廣泛的應(yīng)用。 近年來(lái)隨著電力電子技術(shù)的發(fā)展革新，變頻調(diào)速技術(shù)憑借優(yōu)異的啟動(dòng)、調(diào)速和制動(dòng)性能，高效率與節(jié)能的效果也日益廣泛的應(yīng)為于各種場(chǎng)合。但是現(xiàn)在橋式起重機(jī)設(shè)計(jì)手段依舊落后，重復(fù)性勞動(dòng)很大，并且國(guó)內(nèi)橋式起重機(jī)的結(jié)構(gòu)相比國(guó)外的水平還有一定的差距，開(kāi)發(fā)能力、成品規(guī)模和質(zhì)量都遠(yuǎn)遠(yuǎn)落后于國(guó)外。二戰(zhàn)后日本的 工業(yè)水平得到了前所未有的發(fā)展，以良好的高新技術(shù)基礎(chǔ)日本在起重機(jī)行業(yè)也取得了巨大的成功，在各個(gè)行業(yè)得到了廣泛地推廣，橋式起重機(jī)占整個(gè)起重機(jī)械產(chǎn)量的 %[2 ]。但是在實(shí)際使用中還是會(huì)有事故時(shí)有發(fā)生。 當(dāng)前國(guó)外橋式起重機(jī)的發(fā)展有如下特征： ，減輕自重，降低生產(chǎn)成本 法國(guó)公司采用一種以板材為基本構(gòu)件的小車架結(jié)構(gòu)，使得橋式起重機(jī)重量小，加工簡(jiǎn)單，這項(xiàng)技術(shù)適應(yīng)于中、小噸位的起重機(jī)。 5 為了提高生產(chǎn)率、降低生產(chǎn)成本，國(guó) 外的一些大廠把起重運(yùn)輸機(jī)械巧妙的結(jié)合在一起，構(gòu)成先進(jìn)的機(jī)械化運(yùn)輸系統(tǒng) [4 ]。 橋 式起重機(jī)的技術(shù)革新除了在機(jī)體結(jié)構(gòu)的更新外，電控系統(tǒng)的改革也為橋式起重機(jī)的快速發(fā)展起到了重要的作用。 P LC 網(wǎng)絡(luò)結(jié)構(gòu)以及連接方式、人機(jī)界面硬件選擇和程序設(shè)計(jì)。 三相異步電動(dòng)機(jī)每相電動(dòng)勢(shì)有效值為： mfNE ?11 ? （ 22） 其中： f 電源頻率， Hz； 1N 定子繞組有效匝數(shù)； m? 每級(jí)磁通量， Wb。