?FBM201 ??FBM201 ??FBM201 ??

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，所以其最高工作轉(zhuǎn)速一般在300～600RPM。交流伺服電機(jī)為恒力矩輸出，即在其額定轉(zhuǎn)速（一般為2000RPM或3000RPM）以內(nèi)，都能輸出額定轉(zhuǎn)矩，在額定轉(zhuǎn)速以上為恒功率輸出。

? ?2.4過(guò)載能力不同
聯(lián)?系?人：李素云???

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? ?步進(jìn)電機(jī)一般不具有過(guò)載能力。交流伺服電機(jī)具有較強(qiáng)的過(guò)載能力。以松下交流伺服系統(tǒng)為例，它具有速度過(guò)載和轉(zhuǎn)矩過(guò)載能力。其最大轉(zhuǎn)矩為額定轉(zhuǎn)矩的三倍，可用于克服慣性負(fù)載在啟動(dòng)瞬間的慣性力矩。步進(jìn)電機(jī)因?yàn)闆](méi)有這種過(guò)載能力，在選型時(shí)為了克服這種慣性力矩，往往需要選取較大轉(zhuǎn)矩的電機(jī)，而機(jī)器在正常工作期間又不需要那么大的轉(zhuǎn)矩，便出現(xiàn)了力矩浪費(fèi)的現(xiàn)象。

? ?2.5運(yùn)行性能不同

? ?步進(jìn)電機(jī)的控制為開(kāi)環(huán)控制，啟動(dòng)頻率過(guò)高或負(fù)載過(guò)大易出現(xiàn)丟步或堵轉(zhuǎn)的現(xiàn)象，停止時(shí)轉(zhuǎn)速過(guò)高易出現(xiàn)過(guò)沖的現(xiàn)象，所以為保證其控制精度，應(yīng)處理好升、降速問(wèn)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(duì)電機(jī)編碼器反饋信號(hào)進(jìn)行采樣，內(nèi)部構(gòu)成位置環(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(guò)沖的現(xiàn)象，控制性能更為可靠。