IC697CBL811
IC697CBL811
IC697CBL811
液力偶合器是通過控制工作腔內(nèi)工作油液的動量矩變化，來傳遞電動機(jī)能量，電動機(jī)通過液力偶合器的輸入軸拖動其主動工作輪，對工作油進(jìn)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(fù)載。液力偶合器有調(diào)速型和限矩型之分，前者用于電氣傳動的調(diào)速，后者用于電機(jī)的起動。調(diào)速型液力偶合器效率最大值為95%。液力偶合器的效率計(jì)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(jī)側(cè)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(diào)速越低，效率越低。
2、電磁調(diào)速
電磁調(diào)速系統(tǒng)由鼠籠異步電機(jī)、轉(zhuǎn)差離合器、測速電機(jī)和控制裝置組成，通過改變轉(zhuǎn)差離合器的激磁電流來實(shí)現(xiàn)調(diào)速。轉(zhuǎn)差離合器的本身的損耗是由主動部分的風(fēng)阻、磨擦損耗及從動部分的機(jī)械磨擦損所產(chǎn)生的。如果考慮這些損耗與轉(zhuǎn)差離合器的激磁功率相平衡，且忽略不計(jì)的話，其效率可用下式計(jì)算：
式中：n1――電動機(jī)的輸出軸轉(zhuǎn)速
n2――轉(zhuǎn)差離合器的輸出軸轉(zhuǎn)速
其效率正比于輸出轉(zhuǎn)速，輸出最大轉(zhuǎn)速時其效率理論值為85%。
四、一甲泵、氨泵和氨水泵的變頻調(diào)速節(jié)能
一甲泵、氨泵和氨水泵名義上是泵，實(shí)為壓縮機(jī)。壓縮機(jī)為恒轉(zhuǎn)矩負(fù)載，選用SB70通用變頻器。使用變頻調(diào)速代替液力偶合器調(diào)速的方法是，將液力偶合器拆除，用聯(lián)軸器連接電動機(jī)和負(fù)載軸。變頻器可用手動調(diào)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(chǎn)工藝要求。
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