【導(dǎo)讀】數(shù)字信號處理是一門涉及許多學(xué)科而又廣泛應(yīng)用于許多領(lǐng)域的新興學(xué)科。數(shù)字信號處理是一種通過使用數(shù)學(xué)技巧執(zhí)行轉(zhuǎn)換或提取信息，來處理現(xiàn)實(shí)信。號的方法，這些信號由數(shù)字序列表示。在過去的幾十年時(shí)間里，數(shù)字信號處理已經(jīng)在通信。等領(lǐng)域得到極為廣泛的應(yīng)用。本文介紹了基于DSPTI2802的交流調(diào)速系統(tǒng)的研制。主要在程序方面進(jìn)行了較為深。入的探討,對ePWM模塊進(jìn)行了較為詳細(xì)的解析，通過程序的編譯生成可調(diào)的SPWM波，從而控制三相異步電機(jī)按我們所要的電機(jī)轉(zhuǎn)速的梯形運(yùn)行。

　　

【正文】 method in realizing the frequency converter which with high accuracy multipurpose. In theory aspect, the vector control, the magic flux control, the torque control, the intelligent control, the new control theory and so on have provided the related rationale for the high performance frequency converter development, we may see that, in the overall, the alternating frequency conversion velocity modulation technique in our country has big disparity pares with international level. Therefore, the AC frequency variation speed control technique has the following sides: 1) The basic research of control strategy in frequency converter has a large gap pares with the foreign level. 2) The technical level of the whole machine is low in the frequency converter, although we had input certainly people, material resources, but because of the disperse power, did not form a certainly technique and production scale. 3) All the semiconductor power device product in the frequency converter is blank. 蘇州大學(xué)本科生畢業(yè)設(shè)計(jì)（論文） 30 4) Correlative Industries and relative Industries drop behind. 5) Few production and sale, low reliable and technological standards. With the development and improvement in the power electronic technique, power divert based on power electronic circuit technique and various control technique, the AC frequency variation speed controlled technique is mature day by day, and sure to be the main way in the future. With the constant development of power electronic technique, reliable character, well adoption, cheap price that the frequency converter have will bee true. This technique will gain widely, popularity application .At present, foreign developed countries’ frequency convert technique towards to the miniaturization , high reliability, defend with har m, more function, high character, and our country is ing on now. PLC control system electromagic interference the main source 1) The radiation from space interference mainly produced by temporary attitude course , thunder and lightning , radio broadcasting , TV,radar, highfrequency reaction heating device of the electric work , electric equipment ,etc., usually called radiation to interfere, it is extremely plicated that it is distributed. Whether if PLC system put on radio frequency in the field is it reaches radiation interfere to retrieve, it influences and mainly passes two routes. First, produced and interferes by the reaction of the circuit to the radiation within PLC directly。 But the radiation of the work, is introduced and interfered by the reaction of the munication line while municating to PLC. Radiation is interfered with the onthespot equipment assigning and size of electric magic field that the equipment produce , especially frequency have something to do with, generally through set up shielding cable and PLC some shielding and high pressure discharge ponent protect. 2) Interference from lead wire outside the system Introduce through the power and signal line mainly, is usually called and conducted interfering. This kind of interference is relatively serious at the industrial scene of our country. 3) Interference from power Practice has proved , interference introduced because of the power causes situations of PLC control system trouble a lot of, I meet in debugging in some project, is it isolate performance high PLC power to change, the problem is solved . Normal power supply power, PLC of system supply power by the electric wire ting. Because the electric wire ting is widely covered, it will be interfered the voltage of reaction and circuit on the circuit electromagically by all space. Change of electric wire ting, enter switch operate wave well up, largescale electric equipment is it park, is it is it move in harmony 蘇州大學(xué)本科生畢業(yè)設(shè)計(jì)（論文） 31 wave, electric wire ting that device cause short out the attitude is bludgeoned into etc. temporarily to spread direct to pay to get up especially, it is through it is the original since transmission line of electricity last power. PLC power usually adopts and isolates the power, but its anization and manufacturing engineering factor make its isolating unsatisfactory. In fact, because of distributing the existence of the parameter especially distribution capacity, it is impossible to isolate definitely. 4) Come from the interference that the signal thread introduces All kinds of signal transmission lines connected with PLC control system, besides transmitting all kinds of effective information, always there will be outside interfering signals that will be invaded. This interference has two kinds of ways mainly: Supply power or share through changer power supply power a bunch of electric wire ting entered, signal of instrument interfere, this is often ignored。 second, the signal line is influenced by space electromagic radiation reaction, namely the external inductive interference on the line of signal, this is very serious. Is it is it can cause I/O signal work by signal unusual measuring precision reduce greatly to interfere to introduce, will cause the ponents and parts to damage when being serious. For isolating the system with bad performance, will cause the mutual interference among the signals, cause the backset current of the systematic bus altogether, because logic data changing, work up by mistake and system halted. PLC control system cause by the fact that the signal introduces I/O mould piece is it count quite serious to damage, being caused situations of the systematic trouble by this is a lot of too. 5) Interference while ing from the earth system confusedly Earth to improve electronic equipment electromagic effective means of patibility one of. Correct earth, can suppress the equipment to send out and interfere outwards not only can suppress the electromagic influence that interfere but also。 And wrong earth, can introduce