PIZZATO安全開(kāi)關(guān)NG 2D6D426J
但在運(yùn)用功用和運(yùn)用場(chǎng)合上存在著較大的差異?,F(xiàn)就二者的運(yùn)用功用作一比較。市場(chǎng)上的步進(jìn)電機(jī)和伺服電機(jī)的控制器許多,可是大部分都需求編程才華運(yùn)用?,F(xiàn)在步進(jìn)電機(jī)和伺服電機(jī)的用處很廣泛,是許多設(shè)備優(yōu)先選用的控制電機(jī),由于需求編程才華控制沒(méi)有技才干量的廠家難于運(yùn)用,只得求助外援來(lái)處理。W電機(jī)步距角一般為3.6°、1.8°。
五相混合式步進(jìn)電機(jī)步距角一般為0.72°、0.36°。也有一些高功用的步進(jìn)電機(jī)步距角更小。如四通公司出產(chǎn)的一種用于慢走絲機(jī)床的步進(jìn)電機(jī),其步距角為0.09°;德國(guó)百格拉公司(BERGERLAHR)出產(chǎn)的三相混合式步進(jìn)電機(jī)其步距角可通過(guò)撥碼開(kāi)關(guān)設(shè)置為1.8°、0.9°、0.72°、0.36°、0.18°、0.09°、0.072°、0.036°。
兼容了兩相和五相混合式步進(jìn)電機(jī)的步距角。交流伺服電機(jī)的控制精度由電機(jī)軸后端的旋轉(zhuǎn)編碼器保證。以松下全數(shù)字式交流伺服電機(jī)為例,關(guān)于帶規(guī)范2500線編碼器的電機(jī)而言,由于驅(qū)動(dòng)器內(nèi)部選用了四倍頻技術(shù),其脈沖當(dāng)量為360°/10000=0.036°。關(guān)于帶17位編碼器的電機(jī)而言,驅(qū)動(dòng)器每接納217=131072個(gè)脈沖電機(jī)轉(zhuǎn)一圈。
即其脈沖當(dāng)量為360°/131072=9.89秒。是步距角為1.8°的步進(jìn)電機(jī)的脈沖當(dāng)量的1/655。電機(jī)在低速時(shí)易出現(xiàn)低頻振動(dòng)現(xiàn)象。振動(dòng)頻率與負(fù)載狀況和驅(qū)動(dòng)器功用有關(guān),一般以為振動(dòng)頻率為電機(jī)空載起跳頻率的一半。這種由步進(jìn)電機(jī)的作業(yè)原理所決議的低頻振動(dòng)現(xiàn)象關(guān)于機(jī)器的正常工作非?;逇?。
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