IC697CBL811
IC697CBL811
IC697CBL811
液力偶合器是通過控制工作腔內工作油液的動量矩變化，來傳遞電動機能量，電動機通過液力偶合器的輸入軸拖動其主動工作輪，對工作油進行加速，被加速的工作油再帶動液力偶合器的從動工作渦輪，把能量傳遞到輸出軸和負載。液力偶合器有調速型和限矩型之分，前者用于電氣傳動的調速，后者用于電機的起動。調速型液力偶合器效率最大值為95%。液力偶合器的效率計算的公式為：
式中：nT—為液力偶合器輸出軸的速度（r/min）
nB—為電機側液力偶合器輸入軸的速度(r/min)
其效率為輸入軸和輸出軸的速度之比，調速越低，效率越低。
2、電磁調速
電磁調速系統由鼠籠異步電機、轉差離合器、測速電機和控制裝置組成，通過改變轉差離合器的激磁電流來實現調速。轉差離合器的本身的損耗是由主動部分的風阻、磨擦損耗及從動部分的機械磨擦損所產生的。如果考慮這些損耗與轉差離合器的激磁功率相平衡，且忽略不計的話，其效率可用下式計算：
式中：n1――電動機的輸出軸轉速
n2――轉差離合器的輸出軸轉速
其效率正比于輸出轉速，輸出最大轉速時其效率理論值為85%。
四、一甲泵、氨泵和氨水泵的變頻調速節能
一甲泵、氨泵和氨水泵名義上是泵，實為壓縮機。壓縮機為恒轉矩負載，選用SB70通用變頻器。使用變頻調速代替液力偶合器調速的方法是，將液力偶合器拆除，用聯軸器連接電動機和負載軸。變頻器可用手動調速方式控制，一般情況下一甲泵變頻器的輸出頻率為35Hz～39Hz；氨泵變頻器的輸出為40Hz～44Hz，能夠滿足生產工藝要求。
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