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(diǎn)是：集成高精度轉(zhuǎn)子磁場(chǎng)定向矢量控制算法，具有250%瞬時(shí)轉(zhuǎn)矩控制能力，實(shí)現(xiàn)轉(zhuǎn)矩的快速響應(yīng)和準(zhǔn)確控制，能以很高的精度進(jìn)行寬范圍的調(diào)速運(yùn)行；獨(dú)創(chuàng)的多模式PLC運(yùn)行功能，特別適合工業(yè)制造設(shè)備等應(yīng)用；實(shí)用的多段速功能：提供編碼、直接、疊加和個(gè)數(shù)選擇方式；強(qiáng)大的PID功能等；具備強(qiáng)大的編程功能，用戶可自定義內(nèi)部I/O模塊；轉(zhuǎn)差補(bǔ)償，AVR自動(dòng)穩(wěn)壓功能。模擬量輸入可設(shè)置為±10V，當(dāng)模擬量輸入信號(hào)由正變到負(fù)時(shí)，電機(jī)運(yùn)轉(zhuǎn)方向也隨之改變，反之亦然。在自整角機(jī)上設(shè)置相應(yīng)的參數(shù)，使操縱桿從中心零位開始往前輸出正信號(hào)，往后輸出負(fù)信號(hào)，這會(huì)給使用上帶來方便。
提升機(jī)變頻調(diào)速方案方框圖如圖2所示：
圖2：礦井提升機(jī)變頻調(diào)速方案
三、方案實(shí)施
斜井提升負(fù)載特性是摩擦性位能負(fù)載，屬恒轉(zhuǎn)矩特性負(fù)載。提升機(jī)帶五個(gè)斗，裝滿物料沿斜面起動(dòng)上行時(shí)，電機(jī)的轉(zhuǎn)矩要克服負(fù)載阻轉(zhuǎn)力矩和摩擦力，逐漸加速到全速運(yùn)行，快到井口時(shí)，要逐漸減速。為提高效率，上行加速段和減速段的時(shí)間要盡量短，上行加速的時(shí)間可適當(dāng)加大矢量控制變頻器的容量來保證，由于負(fù)載重慣性大，當(dāng)要求減速時(shí)間短時(shí)，上行的減速過程中有再生能量產(chǎn)生，會(huì)使變頻器直流側(cè)電壓升高而“過壓”，為此，需要用能耗制動(dòng)單元加制動(dòng)電阻或回饋單元處理再生能量；在下放過程中，提升機(jī)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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