| 詳細(xì)參數(shù) | |||
|---|---|---|---|
| 品牌 | AB(Allen-Bradley) | 型號 | 2711P-RDT12H |
| 結(jié)構(gòu)形式 | 整體式 | 安裝方式 | 現(xiàn)場安裝 |
| LD指令處理器 | 硬PLC | 加工定制 | 否 |
2711P-RDT12H
步進(jìn)電機(jī)是一種開環(huán)伺服運(yùn)動(dòng)系統(tǒng)執(zhí)行元件，以脈沖方式進(jìn)行控制，輸出角位移。與交流伺服電機(jī)及直流伺服電機(jī)相比，其突出優(yōu)點(diǎn)就是價(jià)格低廉，并且無積累誤差。但是，步進(jìn)電機(jī)運(yùn)行存在許多不足之處，如低頻振蕩、噪聲大、分辨率不高等，又嚴(yán)重制約了步進(jìn)電機(jī)的應(yīng)用范圍。步進(jìn)電機(jī)的運(yùn)行性能與它的驅(qū)動(dòng)器有密切的聯(lián)系，可以通過驅(qū)動(dòng)技術(shù)的改進(jìn)來克服步進(jìn)電機(jī)的缺點(diǎn)。相對于其他的驅(qū)動(dòng)方式，細(xì)分驅(qū)動(dòng)方式不僅可以減小步進(jìn)電機(jī)的步距角，提高分辨率，而且可以減少或消除低頻振動(dòng)，使電機(jī)運(yùn)行更加平穩(wěn)均勻?？傮w來說，細(xì)分驅(qū)動(dòng)的控制效果最好。因?yàn)槌Ｓ玫投瞬竭M(jìn)電機(jī)伺服系統(tǒng)沒有編碼器反饋，所以隨著電機(jī)速度的升高其內(nèi)部控制電流相應(yīng)減小，從而造成丟步現(xiàn)象。所以在速度和精度要求不高的領(lǐng)域，其應(yīng)用非常廣泛。
因?yàn)槿嗷旌鲜讲竭M(jìn)電機(jī)比二相步進(jìn)電機(jī)有更好的低速平穩(wěn)性及輸出力矩，所以三相混合式步進(jìn)電機(jī)比二相步進(jìn)電機(jī)有更好應(yīng)用前景。傳統(tǒng)的三相混合式步進(jìn)電機(jī)控制方法都是以硬件比較器完成，本文主要講述使用DSP及空間矢量算法SVPWM來實(shí)現(xiàn)三相混合式步進(jìn)電機(jī)控制。
2 細(xì)分原理
步進(jìn)電機(jī)的細(xì)分控制從本質(zhì)上講是通過對步進(jìn)電機(jī)的定子繞組中電流的控制，使步進(jìn)電機(jī)內(nèi)部的合成磁場按某種要求變化，從而實(shí)現(xiàn)步進(jìn)電機(jī)步距角的細(xì)分。最佳的細(xì)分方式是恒轉(zhuǎn)矩等步距角的細(xì)分。一般情況下，合成磁場矢量的幅值決定了電機(jī)旋轉(zhuǎn)力矩的大小，相鄰兩合成磁場矢量的之間的夾角大小決定了步距角的大小。在電機(jī)內(nèi)產(chǎn)生接近均勻的圓形旋轉(zhuǎn)磁場，各相繞組的合成磁場矢量，即各相繞組電流的合成矢量應(yīng)在空間作幅值恒定的旋轉(zhuǎn)運(yùn)動(dòng)，這就需要在各相繞相中通以正弦電流。
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