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pitersky
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樓主  發(fā)表于: 2014-11-03 16:52
各位老師們，我現在有臺電機用變頻器帶動(dòng)的，我需要在觸摸屏上顯示電動(dòng)機運行時(shí)的實(shí)際轉速，我該怎么解決？？？求教！
pitersky
級別: 探索解密
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發(fā)帖數量: 10 個(gè)
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1樓  發(fā)表于: 2014-11-04 17:34
引用
引用第5樓hechaoxi于2014-11-04 12:36發(fā)表的  :
PLC與變頻器通信讀取輸出頻率，然后算出來(lái)，怎么算可以舉個(gè)例子給你參考：假如電機在50HZ頻率額定轉速為2000轉/分，那每輸出一頻率就：2000/50＝40轉。然后在PLC里把讀出來(lái)的頻率乘以40就行了，如果帶減速器那就還要除以減速比，，，， 夠詳細了吧

嗯，我當時(shí)就是這樣考慮的，不過(guò)電機有負載，實(shí)際轉速要比算出來(lái)的慢一點(diǎn)，通過(guò)咨詢(xún)，還是說(shuō)得用編碼器，不過(guò)編碼器的安裝好像需要夠準確，需要找到軸心

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