1756-IB16D
詢價QQ；1093230189
1756-IB16D
由電磁場理論可知，在受到時變磁場作用的任何導體中，都會產生電渦流。據(jù)此原理可自制金屬傳感器電路。在圖1中，電路由振蕩電路、比較電路和整形電路三部分組成。將車刀套入傳感器線圈中，檢測電路接通電源后，線圈振蕩產生一個交變磁場，金屬工件在此磁場中移動時產生渦流而吸取了振蕩器的能量，使振蕩器輸出幅度線性衰減，衰減量的變化正比于金屬工件和車刀的距離。振蕩電路的輸出幅值經過比較器進行比較，比較后的輸出信號經過整形電路整形，可直接輸入控制電路進行檢測狀態(tài)的判別。電渦流式傳感器的靈敏度和線性范圍與線圈產生的磁場強度和分布狀況有關。接近開關的警戒距離可以通過調整傳感器線圈的尺寸、形狀及圖1中R1的電阻來實現(xiàn)調節(jié)。
而速度信號的檢測，首先是采集驅動步進電機的脈沖信號，并在1個時基內采用PLC的高速脈沖計數(shù)器對該脈沖信號進行記數(shù)，將所記數(shù)與寄存器設定值比較，當1個時基內所記數(shù)大于設定值時，就可輸出開關量。
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