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寶米勒變頻器在直線式抽油機上的應用

發布時間:2016/01/19

   目前,直線電機在世界各國的應用大致可分為五個方面,即物流系統、工業設備、信息與自動化系統、交通與民用、軍事及其他。在工業設備上,直線式抽油機是成功產品。

  直線式抽油機的特點電機的特點及對變頻器的要求。

   油井在停止自噴之后,還要用抽油機繼續開采。目前各國的油田大都采用游梁式抽油機開采,這類設備十分笨重(自重數十噸)、體積龐大,安裝調試困難,耗能高、沖程短,不適應采油工業的發展。而今,各種能耗低、體積小、重量輕的新型抽油機相繼問世。直線電機抽油機是其中很有前途的一種,其結構示意圖下圖所示。

  它結構緊湊、重量輕、體積小。動子(相當旋轉電機的轉子)是直線往復運動,通過柔性連接件、鋼絲繩導向輪直接與抽油桿連接。動子的運動與抽油泵柱塞上下運動完全一致,其生產成本低、運行效率高、維護費用少。

  它的沖程長度、上沖行程時間、下沖行程時間等可以方便的調節,實現上快下慢、上慢下快、上下行程同速等三種作業方式。

對變頻器的要求

1.     頻率范圍:0~10Hz,連續可調

2.     啟動頻率0Hz,啟動電壓Vdc在0~300V之間連續可調

3.     V/F曲線如下圖所示



5.   

5.       動子運動時頻繁換向,要求換向平穩、無撞擊現象。

專用變頻器的研制

寶米勒變頻器獨具的版本升級功能,能夠為用戶多身定做用戶專用變頻器。根據直線式抽油機的特點和要求,專門進行功能開發并取得滿意的效果。如:
1.
動子換向
  在旋轉電機中,轉子正、反轉換向是用任意兩相互換實現的,而直線式抽油機要求換向平穩,所以特采用連續的位相控制,實現無沖擊的換向過程。
2.
連續直流制動
 為了保證動子運動在任何位置時都能停機而不會滑動,用軟件實現直流制動,即給定子供直流電,把動子吸在所要求的位置。并通過外部端子進行連續制動。
3.
初始電壓的任意調整
  任意設定,并從停止位置平穩啟動。
4
、運轉信號的保持
  在外部運轉信號消失和中途停止再啟動的情況下,自動記憶初始狀態并按要求的方向進行運轉。
5
、自動節能功能
  根據負載的變化自動調節輸出電壓,以達到最大限度的節能效果。

實際運行情況:

寶米勒變頻器在油田試運行良好,各項指標均滿足用戶要求,與傳統磕頭機相比,有很大的節能空

5.     

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