AECO傳感器SC30SM-CE25 PNP NO+NC H
當(dāng)步進(jìn)電機(jī)作業(yè)在低速時(shí)，一般應(yīng)選用阻尼技術(shù)來戰(zhàn)勝低頻振動(dòng)現(xiàn)象，比如在電機(jī)上加阻尼器，或驅(qū)動(dòng)器上選用細(xì)分技術(shù)等。交流伺服電機(jī)工作非常平穩(wěn)，即便在低速時(shí)也不會(huì)出現(xiàn)振動(dòng)現(xiàn)象。交流伺服系統(tǒng)具有共振按捺功用，可涵蓋機(jī)械的剛性缺少，并且系統(tǒng)內(nèi)部具有頻率解析機(jī)能(FFT)，可檢測出機(jī)械的共振點(diǎn)。
便于系統(tǒng)調(diào)整。如何選擇步進(jìn)電機(jī)和伺服電機(jī)矩頻特性不同步進(jìn)電機(jī)的輸出力矩隨轉(zhuǎn)速升高而下降，且在較高轉(zhuǎn)速時(shí)會(huì)急劇下降，所以其高作業(yè)轉(zhuǎn)速一般在300～600RPM。交流伺服電機(jī)為恒力矩輸出，即在其額外轉(zhuǎn)速(一般為2000RPM或3000RPM)以內(nèi)，都能輸出額外轉(zhuǎn)矩，在額外轉(zhuǎn)速以上為恒功率輸出。
過載才干不同電機(jī)一般不具有過載才干。交流伺服電機(jī)具有較強(qiáng)的過載才干。以松下交流伺服系統(tǒng)為例，它具有速度過載和轉(zhuǎn)矩過載才干。其最大轉(zhuǎn)矩為額外轉(zhuǎn)矩的三倍，可用于戰(zhàn)勝慣性負(fù)載在發(fā)起瞬間的慣性力矩。步進(jìn)電機(jī)由于沒有這種過載才干，在選型時(shí)為了戰(zhàn)勝這種慣性力矩，往往需求選取較大轉(zhuǎn)矩的電機(jī)。
而機(jī)器在正常作業(yè)期間又不需求那么大的轉(zhuǎn)矩，便出現(xiàn)了力矩糟蹋的現(xiàn)象。運(yùn)行功用不同電機(jī)的控制為開環(huán)控制，發(fā)起頻率過高或負(fù)載過大易出現(xiàn)丟步或堵轉(zhuǎn)的現(xiàn)象，中止時(shí)轉(zhuǎn)速過高易出現(xiàn)過沖的現(xiàn)象，所以為保證其控制精度，應(yīng)處理好升、降速問題。交流伺服驅(qū)動(dòng)系統(tǒng)為閉環(huán)控制，驅(qū)動(dòng)器可直接對電機(jī)編碼器反饋信號(hào)進(jìn)行采樣。
內(nèi)部構(gòu)成環(huán)和速度環(huán)，一般不會(huì)出現(xiàn)步進(jìn)電機(jī)的丟步或過沖的現(xiàn)象，控制功用更為牢靠。速度呼應(yīng)功用不同電機(jī)從靜止加快到作業(yè)轉(zhuǎn)速(一般為每分鐘幾百轉(zhuǎn))需求200～400毫秒。交流伺服系統(tǒng)的加快功用較好，以松下MSMA400W交流伺服電機(jī)為例，從靜止加快到其額外轉(zhuǎn)速3000RPM僅需幾毫秒。
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