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angelagent
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樓主  發(fā)表于: 2008-08-04 20:40
cp1h用高速計數器做電子凸輪
我用PRV 指令抓取脈沖數。
編碼器接ABZ三相,分辨率為360。采用高速計數器0   循環(huán)模式 Z相和軟件復位,相位差輸入,循環(huán)最大計數為1440,
PRV讀取的數值再做運算,如校正、Z相、除以4變成電子角度,再寫(xiě)電子凸輪程序。
不知道有沒(méi)其他更好的方式???
nbwrk
樹(shù)不要皮必死無(wú)疑!人不要臉天下無(wú)敵!
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1樓  發(fā)表于: 2008-09-02 11:40
這個(gè)跟電子凸輪還是有區別的吧  用這種方法做會(huì )產(chǎn)生一個(gè)誤差   比如說(shuō)斷電后再轉動(dòng)編碼器就會(huì )出現錯誤  雖然你用了Z相作校正 但還是會(huì )存在很多問(wèn)題   我也用過(guò)這種方法  因為增量式編碼器是集電極開(kāi)路輸出的  一但距離遠了就會(huì )出現干擾  有時(shí)候甚至校正信號Z都采集不到  特別是有大功率變頻器在的時(shí)候    
而電子凸輪用的是絕對值編碼器  輸出的是格雷碼  從信號來(lái)說(shuō)完全不一樣的

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