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雙極性驅動電路的晶體管只需要承受電機電壓

文章出處:maituwangluo.com  |  發布時間:2023/11/4 16:44:50  |  瀏覽次數:0
 步進(jin)電(dian)(dian)(dian)機(ji)、DC電(dian)(dian)(dian)機(ji)和(he)無刷DC電(dian)(dian)(dian)機(ji)的(de)主要(yao)區別在于它(ta)們的(de)驅(qu)動模式。步進(jin)電(dian)(dian)(dian)機(ji)分步移(yi)動,DC電(dian)(dian)(dian)機(ji)和(he)無刷DC電(dian)(dian)(dian)機(ji)通(tong)常(chang)采用(yong)連(lian)續移(yi)動的(de)模擬控制(zhi)模式。由(you)于步進(jin)電(dian)(dian)(dian)機(ji)采用(yong)步進(jin)移(yi)動,特別適合(he)地址應用(yong)。
  目前市場上常見(jian)的步進電(dian)(dian)機(ji)可提(ti)供每一步1.8°或0.9°準 確的移動能(neng)力。步進電(dian)(dian)機(ji)采用直接控制模式,其主(zhu)要(yao)命令和控制變(bian)(bian)量為步階位置(zhi)(zhi)(stepposition);相形(xing)之下,DC電(dian)(dian)機(ji)以(yi)電(dian)(dian)機(ji)電(dian)(dian)壓為控制變(bian)(bian)量,以(yi)位置(zhi)(zhi)或速度(du)為命令變(bian)(bian)量。DC電(dian)(dian)機(ji)需要(yao)反饋(kui)控制系統,它(ta)將間接控制電(dian)(dian)機(ji)的位置(zhi)(zhi),步進電(dian)(dian)機(ji)系統主(zhu)要(yao)是基于「開(kai)環」操(cao)作方式。
  步進(jin)電機
  步進(jin)(jin)電(dian)(dian)(dian)(dian)(dian)機(ji)可根據電(dian)(dian)(dian)(dian)(dian)機(ji)結構、驅動結構和步進(jin)(jin)方(fang)式進(jin)(jin)行分類(lei)。步進(jin)(jin)電(dian)(dian)(dian)(dian)(dian)機(ji)有幾(ji)種結構,包括可變磁(ci)(ci)阻(zu)(variablereluctance)、永(yong)磁(ci)(ci)和混合永(yong)磁(ci)(ci)(hybridpermanentmagnet),永(yong)磁(ci)(ci)步進(jin)(jin)電(dian)(dian)(dian)(dian)(dian)機(ji)的(de)(de)成本(ben)很低(di),主要用于低(di)成本(ben)的(de)(de)消(xiao)費品。混合步進(jin)(jin)電(dian)(dian)(dian)(dian)(dian)機(ji)的(de)(de)價格(ge)略高(gao),是工(gong)業移(yi)動控(kong)制應用中常見的(de)(de)電(dian)(dian)(dian)(dian)(dian)機(ji)。可變磁(ci)(ci)阻(zu)電(dian)(dian)(dian)(dian)(dian)機(ji)通常有3或(huo)5個相位,需(xu)要不同的(de)(de)驅動電(dian)(dian)(dian)(dian)(dian)路(lu)結構。
  單極(ji)(ji)性(xing)(unipolar)和雙(shuang)極(ji)(ji)性(xing)(bipolar)它是步進(jin)(jin)電機(ji)(ji)常用(yong)(yong)的(de)兩(liang)種(zhong)驅動(dong)結構。單極(ji)(ji)性(xing)驅動(dong)電路采用(yong)(yong)四個(ge)(ge)晶體管驅動(dong)步進(jin)(jin)電機(ji)(ji)的(de)兩(liang)組相(xiang)(xiang)位(wei)。電機(ji)(ji)結構包括兩(liang)組帶(dai)中間(jian)抽頭的(de)線圈(quan),整個(ge)(ge)電機(ji)(ji)有(you)六條線與外界相(xiang)(xiang)連。這種(zhong)電機(ji)(ji)有(you)時也叫四相(xiang)(xiang)電機(ji)(ji),但(dan)這個(ge)(ge)名字容易混(hun)淆和不正(zheng)確,因(yin)為它實際上只有(you)兩(liang)個(ge)(ge)相(xiang)(xiang)位(wei)。準確地說(shuo),它應(ying)該是雙(shuang)相(xiang)(xiang)六線步進(jin)(jin)電機(ji)(ji)。雖然六線步進(jin)(jin)電機(ji)(ji)又(you)稱單極(ji)(ji)性(xing)步進(jin)(jin)電機(ji)(ji),但(dan)實際上可以同(tong)時使用(yong)(yong)單極(ji)(ji)性(xing)或(huo)雙(shuang)極(ji)(ji)性(xing)驅動(dong)電路。
  雙(shuang)極性步進電(dian)機的(de)驅(qu)動電(dian)路,采用八個晶體(ti)管驅(qu)動兩(liang)組相位。雙(shuang)極性驅(qu)動電(dian)路可以同時(shi)驅(qu)動四線或六線步進電(dian)機。雖然四線電(dian)機只能使用雙(shuang)極性驅(qu)動電(dian)路,但可以大大降低(di)量產(chan)應用的(de)成本。
  雙極性(xing)步(bu)進電(dian)機驅動(dong)電(dian)路的晶體(ti)(ti)管(guan)數(shu)量,是(shi)單極性(xing)驅動(dong)電(dian)路的兩倍,其中四個(ge)下(xia)端晶體(ti)(ti)管(guan)通(tong)常由(you)微控制器直接驅動(dong),而(er)上端晶體(ti)(ti)管(guan)則需要成本較高的上端驅動(dong)電(dian)路。
  雙(shuang)極性(xing)驅動(dong)電(dian)(dian)路(lu)(lu)的晶體管(guan)只需(xu)要承(cheng)受電(dian)(dian)機電(dian)(dian)壓,所以不(bu)像單極性(xing)驅動(dong)電(dian)(dian)路(lu)(lu)那(nei)樣需(xu)要夾緊電(dian)(dian)路(lu)(lu)。
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