A20B-2900-0340

A20B-2900-0340

可以看出：普通的兩相和三相異步電動機正常情況下都是在對稱狀態(tài)下工作，不對稱運行屬于故障狀態(tài)。而交流伺服電機則可以靠不同程度的不對稱運行來達到控制目的。這是交流伺服電機在運行上與普通異步電動機的根本區(qū)別。

所以，伺服電動機的作用是驅(qū)動控制對象。被控對象的轉(zhuǎn)距和轉(zhuǎn)速受信號電壓控制，信號電壓的大小和極性改變時，電動機的轉(zhuǎn)動速度和方向也跟著變化。現(xiàn)在我們可以導(dǎo)出伺服油泵液壓系統(tǒng)的必要特性： 一   液壓系統(tǒng)構(gòu)成必要特性：A  節(jié)能；B 動作高響應(yīng)。

 液壓泵必要特性：A  變速控制；B  高機械效率。 三   伺服電機必要特性A  高響應(yīng)；B  率；  C  低速時大轉(zhuǎn)矩 四   適應(yīng)性A  壓力流量比例控制；B  控制對象能順暢地切換。

伺服油泵液壓系統(tǒng)的控制原理：圖四是伺服油泵液壓系統(tǒng)簡圖。該系統(tǒng)也有兩種工作狀態(tài)：流量控制狀態(tài)和壓力控制狀態(tài)。在流量控制狀態(tài)下，壓力傳感器所監(jiān)測到的壓力小于設(shè)定的壓力，伺服馬達按流量控制狀態(tài)工作，即控制伺服馬達的轉(zhuǎn)速，使泵的輸出流量保持在設(shè)定值。流量控制狀態(tài)時，泵處于流量閉環(huán)控制狀態(tài)。在壓力控制狀態(tài)下，壓力傳感器所監(jiān)測到的壓力將達到或達到設(shè)定值時，伺服馬達按壓力控制狀態(tài)工作，即控制伺服馬達的轉(zhuǎn)速至小，僅向系統(tǒng)控制泄漏或保壓所需的流量。此時泵處開壓力閉環(huán)控制狀態(tài)。

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