IC697ALG440
IC697ALG440
IC697ALG440
變頻器選用希望森蘭科技股份有限公司生產(chǎn)的SB70G280高性能系列矢量控制變頻器，變頻器主要特點是：集成高精度轉子磁場定向矢量控制算法，具有250%瞬時轉矩控制能力，實現(xiàn)轉矩的快速響應和準確控制，能以很高的精度進行寬范圍的調速運行；獨創(chuàng)的多模式PLC運行功能，特別適合工業(yè)制造設備等應用；實用的多段速功能：提供編碼、直接、疊加和個數(shù)選擇方式；強大的PID功能等；具備強大的編程功能，用戶可自定義內(nèi)部I/O模塊；轉差補償，AVR自動穩(wěn)壓功能。模擬量輸入可設置為±10V，當模擬量輸入信號由正變到負時，電機運轉方向也隨之改變，反之亦然。在自整角機上設置相應的參數(shù)，使操縱桿從中心零位開始往前輸出正信號，往后輸出負信號，這會給使用上帶來方便。
提升機變頻調速方案方框圖如圖2所示：
圖2：礦井提升機變頻調速方案
三、方案實施
斜井提升負載特性是摩擦性位能負載，屬恒轉矩特性負載。提升機帶五個斗，裝滿物料沿斜面起動上行時，電機的轉矩要克服負載阻轉力矩和摩擦力，逐漸加速到全速運行，快到井口時，要逐漸減速。為提高效率，上行加速段和減速段的時間要盡量短，上行加速的時間可適當加大矢量控制變頻器的容量來保證，由于負載重慣性大，當要求減速時間短時，上行的減速過程中有再生能量產(chǎn)生，會使變頻器直流側電壓升高而“過壓”，為此，需要用能耗制動單元加制動電阻或回饋單元處理再生能量；在下放過程中，提升機帶的已經(jīng)是空斗了，但在快速下放的過程仍有再生能量產(chǎn)生，也需要處理再生能量。
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