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下工作，不對稱運行屬于故障狀態。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別。

所以，伺服電動機的作用是驅動控制對象。被控對象的轉距和轉速受信號電壓控制，信號電壓的大小和極性改變時，電動機的轉動速度和方向也跟著變化。現在我們可以導出伺服油泵液壓系統的必要特性： 一   液壓系統構成必要特性：A  節能；B 動作高響應。

 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；B  率；  C  低速時大轉矩 四   適應性A  壓力流量比例控制；B  控制對象能順暢地切換。

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

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