1756-OF8

1756-OF8

1、在控制精度上，我個人的想法一般情況下還是伺服優(yōu)于步進(jìn)，步進(jìn)是有細(xì)分，但細(xì)分高于40以上還有實(shí)際意義嗎？256細(xì)分的步角已經(jīng)出現(xiàn)大小步的現(xiàn)象了，如何談精度？個人認(rèn)為40以上的細(xì)分已經(jīng)不能作為了，只能為了加強(qiáng)運(yùn)行的平滑性，而伺服電機(jī)可以通過外部的編碼器分辨率的加大來提。

2、伺服在微動或保持上確實(shí)是一種動態(tài)的平衡，它是系統(tǒng)通過檢測的位置信號進(jìn)行的負(fù)反饋PID調(diào)節(jié)，它低于一個編碼器分辨率時(shí)的微動不響應(yīng)，保持時(shí)也是動態(tài)的響應(yīng)外部負(fù)載而隨時(shí)改變力矩以達(dá)到動態(tài)的靜平衡，保持精度比步進(jìn)差。

3、由于步進(jìn)電機(jī)驅(qū)動通常帶有細(xì)分，而停止時(shí)通常會停止在細(xì)分點(diǎn)也就是不是磁極點(diǎn)上，那么停電后再次上電時(shí)驅(qū)動器不會按照停止時(shí)的各相電流進(jìn)行分配，那么出現(xiàn)了步進(jìn)電機(jī)重新上電時(shí)通常會出現(xiàn)強(qiáng)烈的小振一下，也就是轉(zhuǎn)子迅速與初始定子磁場對應(yīng)，而伺服沒有該現(xiàn)象。

伸長率是導(dǎo)體機(jī)械性能重要指標(biāo)，是產(chǎn)品優(yōu)劣和能承受外力大小的重要標(biāo)志。也是檢驗(yàn)電纜導(dǎo)體機(jī)械性能的一個重要指標(biāo)。鋁合金電纜退火后的延伸率能達(dá)到3%，而銅纜的伸長率為25%，普通鋁桿的伸長率為15%，是能取代鋁芯電纜與銅纜的重要指標(biāo)。鋁合金電纜的柔韌性能扭轉(zhuǎn)試驗(yàn)：主要檢驗(yàn)金屬線材的韌性，韌性愈好，能承受的扭轉(zhuǎn)次數(shù)愈多。普通鋁絲的一個重要缺點(diǎn)是脆度高，在時(shí)只要若干次角度的扭轉(zhuǎn)，導(dǎo)體就會產(chǎn)生裂紋，裂口就會發(fā)熱、腐蝕，是出現(xiàn)火災(zāi)的重要原因。

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